FIELD OF INVENTION

[001] Embodiments of the present invention relates generally to pneumatic plants, in particular, the invention relates to an energy recovery and efficient device that is installed on different pneumatic actuators to reduce the consumption of compressed air thereof whilst maintaining performance unvaried. The invention further relates to a movement apparatus comprising a pneumatic actuator provided with and pneumatic actuating system and a method for driving pneumatic actuator.

BACKGROUND

[002] Known pneumatic actuators are typically pneumatic chambers that comprise a casing or hollow external container inside which a piston with stem slides that divides the interior of the casing into two chambers. In single-acting actuators only one of the chambers is supplied with compressed air so as to exert a thrust or rotary force onto the piston in a single direction and during one of the strokes of the latter. In double acting actuators, both chambers are selectively supplied with compressed air to exert respective thrust or torque onto the piston during the strokes (forward and backward strokes or clockwise and anticlockwise strokes). [003] The pneumatic actuators are generally used in apparatus and operating machines, inserted into pneumatic plants or circuits. In addition to other components (valves, distributors, regulators, etc.), a compression arrangement that is able to supply compressed air at the required supply pressure. The compression arrangement comprises one or more compressors provided with electric motors or internal combustion engines.

[004] In the analysis of running costs of an apparatus or of an operating machine and, more in general, of a manufacturing company provided with a plurality of operating machines and of pneumatic plants, the cost of producing compressed air is rather a significant percentage of total operating costs. This cost comprises not only the energy cost required for supplying the compression arrangement, but also the cost of routine and extraordinary maintenance of the latter, the use of air cleaning and filtering systems, removal of condensate, air-cooling, etc. In particular, the quantity of energy required to produce compressed air is directly proportional to the valve of the operating pressure required in the plant.

[005] In particular utilizing the power stroke exhaust air is one of the aspects ignored to conserve the energy. Commonly known method to connect the power stroke vent to low pressure system makes the system more efficient but due to the back pressure it affects the performance of the high-pressure system along with the disadvantage of the multiple pressure circuit setup cost.

[006] The Japanese patent documents JP3705730B2 and JP5807227B2 describe two pressure sources like high -pressure source and low-pressure source. Maintaining such different pressure sources add costs because there should be different equipment needs different designs in terms of pressure, flow, and other parameters. It also needs two different storage systems, compressor systems etc.

[007] The Korean patent document KR100784678B1 describes a solenoid type compressor to recycle the out coming air from cylinder by compressing and store it back it the tank. The main drawback of the system described in KR100784678B1 is the reciprocating nature of the solenoid type compressor that cannot take air while in discharge stroke. This condition increases the back pressure on the low-pressure side of the cylinder piston. This back pressure changes the output force of the cylinder either in forward or reverse stroke. Another limitation of the system is to use it as independent but not as a general pneumatic system where it can be integrated in to the common line.

[008] The U.S. patent document U.S. 2014/0190346A1 describes special devices to reduce the pressure on low pressure side of the cylinder piston to increase the differential pressure to improve the final force coming out of the piston rod. The drawback of the system is to reduce the pressure the system consumes the excess air in the vacuum generators will compensate the savings.

[009] The U.S. patent document U.S. 2001/0027719A1 describes creation of a back pressure while the cylinder is in working stroke, then to use the pressurized air to be released at the end of the working stroke. If back pressure has to create with the working stroke force, it adds the consumption of the working stroke air intake. One more disadvantage is the piston has to work for the external force and creating back pressure, its size needs to increase. It means the cylinder size will increase more than requirement. One more disadvantage is if the return stroke force is high, the cylinder will stick because the working back pressure is lower than the main source pressure.

[0010] The Chinese patent documents CN 105697449A and CN 110397642A describe increasing the piston rod diameter at the gland/piston rod sealing. This kind of design limits the return stroke force. If pressure controller needs to refine the return force, there is no need of using the increased diameter of piston rod because with standard piston rod and by controlling pressure we can do save the compressed air

[0011] Accordingly, there is a continued need for the development of different pneumatic actuators to reduce the consumption of compressed air thereof whilst maintaining performance.

OBJECT OF THE INVENTION

[0012] The principal object of the invention is to improve efficiency of known pneumatic plants, in particular pneumatic plants for apparatuses and operating machine provided with pneumatic actuators.

[0013] Another object of the invention is to supply a pneumatic actuating system that is installed with a pneumatic actuator (linear or rotary) and a method for controlling a pneumatic actuator that enables compressed air consumption to be lowered whilst maintaining unchanged performance (thrust and traction or torque on the piston, speed, acceleration) of the latter.

[0014] A further object is to make a pneumatic actuating system that is compact, with modest bulk and dimensions and is easily installable on or interchangeable into a pneumatic system.

[0015] Another object is to provide a pneumatic actuating system having reliable and safe operation that ensures optimum performance to the pneumatic actuator associated therewith.

[0016] These and other objects and characteristics of the present invention will become apparent from the further disclosure to be made in the detailed description given below.

SUMMARY OF THE INVENTION

[0017] This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

[0018] The invention provides a pneumatic actuating system that includes at least one main casing that includes a first sealable piston. The first sealable piston is configured to divide the at least one main casing into a first power chamber and a first return chamber.

[0019] At least one auxiliary casing that includes a second sealable piston. The second sealable piston is configured to divide the at least one auxiliary casing into a second power chamber and a second return chamber. A plurality of mechanical links associated with the at least one main casing, the at least one auxiliary casing, an external system, ground, a first end of the pneumatic actuating system, and a second end of the pneumatic actuating system. A pneumatic circuit that includes a plurality of valves, a pressured air source, and at least one vent. The pneumatic circuit is connected to at least one of: the first power chamber and the first return chamber of the at least one main casing, or the second power chamber and the second return chamber of the at least one auxiliary casing, and the plurality of valves configured to be operated to complete a power stroke and a return stroke.

[0020] These together with other objects of the invention, along with the various features of novelty which characterize the invention, are pointed out with particularity in the disclosure. For a better understanding of the invention, its operating advantages and the specific objects attained by its uses, reference should be had to the accompanying drawings and descriptive matter in which there are illustrated preferred embodiments of the invention.

BRIEF DESCRIPTION OF DRAWINGS

[0021 ] This invention is illustrated in the accompanying drawings, throughout which, like reference letters indicate corresponding parts in the various figures. The embodiments herein will be better understood from the following description with reference to the drawings, in which:

[0022] FIG. 1 illustrates sectional view of the actuating system with one main casing and one auxiliary casing in parallel orientation, in accordance with an example embodiment of the present disclosure.

[0023] FIG.2 illustrates a schematic view of the actuating system with one main casing and one auxiliary casings with a circuit comprises a plurality of valves, in accordance with an example embodiment of the present disclosure.

[0024] FIG.3 illustrates a schematic view of the actuating system with one main casing and one auxiliary casing with a circuit consists of standard valves: spool valve, non-return valve, in accordance with an example embodiment of the present disclosure.

[0025] FIG. 4 illustrates a sectional view of the actuating system with one main casing and one auxiliary casing in tandem orientation, in accordance with an example embodiment of the present disclosure. [0026] FIG.5 illustrates a schematic view of the actuating system with one main casing and one auxiliary casing with a circuit comprises a plurality of valves, in accordance with an example embodiment of the present disclosure.

[0027] FIG.6 illustrates a schematic view of the actuating system with one main casing and one auxiliary casing with circuit comprises standard valves: spool valve, non-return valve, in accordance with an example embodiment of the present disclosure.

[0028] FIG. 7 illustrates an isometric view of the actuating system with one main casing and one auxiliary casing with cross configuration, in accordance with an example embodiment of the present disclosure.

[0029] FIG. 8 illustrates a front view with partial section views of the actuating system with one main casing and one auxiliary casing with cross configuration, in accordance with an example embodiment of the present disclosure.

[0030] FIG. 9 illustrates the actuating system with a main casing and auxiliary casing

12 with a circuit consist of valves VI, V2, V3 with connections between respective casings and pistons of main casing and auxiliary casing in the reverse configuration.

[0031 ] FIG. 10 illustrates a graphical representation of force vs. piston position in both forward stroke and return stroke, in accordance with an example embodiment of the present disclosure.

DETAILED DESCRIPTION OF INVENTION

[0032] The embodiments herein and the various features and advantageous details thereof are explained more fully with reference to the non-limiting embodiments that are illustrated in the accompanying drawings and / or detailed in the following description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein may be practised and to further enable those of skill in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.

[0033] Reference in this specification to “one embodiment” or “an embodiment” or

“some example embodiments” means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present disclosure. The appearance of the phrase “in an embodiment” in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Moreover, various features are described which may be exhibited by some embodiments and not by others. Similarly, various requirements are described which may be requirements for some embodiments but not for other embodiments.

[0034] Moreover, although the following description contains many specifics for the purposes of illustration, anyone skilled in the art will appreciate that many variations and/or alterations to said details are within the scope of the present disclosure. Similarly, although many of the features of the present disclosure are described in terms of each other, or in conjunction with each other, one skilled in the art will appreciate that many of these features can be provided independently of other features. Accordingly, this description of the present disclosure is set forth without any loss of generality to, and without imposing limitations upon the present disclosure.

[0035] Various embodiments of the present provide a pneumatic actuating system that is installed with a pneumatic actuator (linear or rotary) and a method for controlling a pneumatic actuator. In some example embodiments of the invention, there is provided a pneumatic actuating system comprising at least one main casing and at least one auxiliary casing and all casings are divided in to two chambers with respective pairing piston. All pistons are connected by mechanical links and all casings are mechanically connected to mimic or reciprocal the motion synchronously in different operations, for example: Power stroke, Return stroke, etc. The piston in the main casing exerts the force or torque due to the pressure of the air in chamber adjacent to the piston in said main casing. For example: a twin chamber efficient actuator comprises first casing paired with first piston and second casing paired with second piston. First piston that is movable inside the first casing defines a first chamber and a second chamber inside the first casing.

[0036] The second piston that is movable inside the second casing defines the third chamber and a fourth chamber inside the second casing. Both first casing and second casing are rigidly connected with a mechanical link. Furthermore example: a triple chamber efficient actuator comprises first casing paired with first piston and second casing paired with second piston and third casing paired with third piston. First piston that is movable inside the first casing defines a first chamber and a second chamber inside the first casing. The second piston that is movable inside the second casing defines the third and a fourth chamber inside the second casing. The third piston inside the third casing defines the fifth and a sixth chamber inside the third casing.

[0037] Common in both examples mentioned is that all pistons in the actuator system are connected mechanically and the first chamber piston is actuated with high pressure air is the power stroke piston. All pistons move synchronously by mechanical link means from group of mechanical link type consisting of rigid link, flexible link, magnetic link, hydraulic link, flexible coupling, cables, shafts, gears, rack and pinion, belt and chain. In power stroke and return stroke, the force transfers through any mechanical link from group consist of shaft rod, magnetic coupling, direct piston mount, bracket mount, rack & pinion, hydraulic link, cable to the external system with power piston. Said main casing or auxiliary casing can be configured with linear or rotary movement of respective pistons. First, second and third casings are mechanically linked. [0038] In a second aspect of the invention, a pneumatic circuit comprising combination of valves and vents to operate the actuating system to achieve desirable mode of operation in efficient manner by controlling high pressure air source, vents and inter chamber connections. [0039] In different modes of operation said chambers may operate in different modes like connecting to high pressure source, venting or interconnected with another chamber. In an actuating system with twin casing the first mode of the operation is power stroke mode and the second mode of the operation is return stroke or retrieval stroke mode. For example: a linear actuator with a piston and piston rod, in power stroke the piston rod comes out of the casing and in retrieval or return stroke the piston rod goes inside the casing.

[0040] In another example, a rotary actuator with a rotary piston, in power stroke the piston rotates the shaft protruded out of the casing in clockwise direction and in return or retrieval or reverse stroke the shaft protruded out of the casing rotates in anti-clockwise direction. Furthermore example: In a linear rod less actuator, in power stroke the piston inside casing moves the mounting platform forward and in return stroke moves the mounting platform in reverse direction. In power stroke mode in twin casing actuator one of the chambers is connected to the high-pressure air by the pneumatic circuit and other all chambers will be connected to the vent to release the pressure to atmosphere. This way the high pressure pushes the piston towards end of the power stroke.

[0041 ] Once the power stroke is completed and when the reversing is needed the circuit will be activated to close the high-pressure inlet to the power stroke chamber of first cylinder and the power stroke chamber is connected to the return stroke chamber of the same cylinder. In this way both sides of the cylinder pressure will be same. To complete the mode of the operation both pressure chambers of main casing will be connected to the return chamber of the auxiliary casing where the return chamber is having least volume due to the travel of the piston in the second casing which is also connected mechanically to the piston in the first casing. The other chamber having high volume in the second casing at this stage will be connected to the vent to prevent back pressure. The high-pressure air from main chamber of the first casing is free to expand while pushing the piston in the auxiliary chamber towards end of the return stroke; in turn as both pistons are connected mechanically the piston in the first casing also travels towards end of return stroke.

[0042] The cross-section area of the first and second casings which provides effective area for the pressure acting is calculated based on the maximum force needed in power stroke and start of return stroke respectively. Said novel efficient pneumatic actuating system prevents using high pressure air for the return stroke by using the utilized high-pressure air in the power stroke chamber at the end of the power stroke to make the actuating system more efficient. [0043] FIGS. 1-3 illustrate the actuating system with one main casing (11) and one auxiliary casing in parallel orientation, in accordance with an example embodiment of the present disclosure. There is shown a main casing (11) and an auxiliary casing (12) in parallel orientation. The main casing (11) may comprise a main casing first chamber (1 G) and a main casing second chamber (11”). The auxiliary casing (12) may comprise an auxiliary casing first chamber (12’) and an auxiliary casing second chamber (12”). Further, there is provided a piston system (13) in the main casing (11). The piston system (13) may include a piston (13’) in the main casing (11) and a mechanical link (13”). The mechanical link (13”) is piston rod between piston (13’) and external system to transfer force. The auxiliary system comprises a piston system (14). The pneumatic actuating system comprises a first end and a second end. A piston (14’) is included in the piston system (14) of the auxiliary system (12). The piston system (14) may further include a mechanical link (14”). The mechanical link (14”) is piston rod between piston (14’) and systems outside of auxiliary casing (12).

[0044] Further, a first rigid link (15) is between main casing (11) and auxiliary casing

(12). A second rigid link (16) is between piston system (13) in the main casing (11) and piston system (14) in the auxiliary casing. The main casing first chamber (1 G) comprises an Air inlet/exit port (17a). The main casing second chamber (11”) comprises air inlet/exit port (17b). The auxiliary casing first chamber (12’) comprises air inlet/exit port (18a). The auxiliary casing second chamber (12”) comprises air inlet/exit port(18b). Further, a spool valve (19) with integrated maximum valve functions is provided. The spool valve (19) comprises a spool valve block (19a) for forward / power stroke and spool valve block (19b) for reverse / return stroke. In addition, a mechanical link (20) is between piston mechanical link 13” and external system is provided. Further, the terms “F” refers to actuation force/reaction force, “VI” refers to forward stroke valve, “V2” refers to reverse stroke bypass valve, “V3” refers to forward stroke vent valve, and “NRV” refers to non-return valve.

[0045] In some example embodiments, both the main casing (11) and auxiliary casing

(12) are arranged in parallel and rigidly linked with a mechanical link (15). In some example embodiments, the mechanical link (15) is a clamping system which is a rigid joint. Both the main casing (11) and the auxiliary casing 12 are divided by respective piston systems i.e., main piston system (13) for main casing (11) and auxiliary piston system (14) for auxiliary casing (12). Each piston system consists ofplurality ofpistons that include main piston (13’), auxiliary piston (14’) and piston mechanical links (13”), 14”. The piston mechanical links (13”, 14”) comprises piston systems (13, 14) which are linked with a mechanical link system (16). In some example embodiments, the mechanical link (16) is a rigid bracket arrangement. Due to the mechanical link (16) the piston systems (13, 14) mimic the movement in case any one of the piston system is forced to move because other piston system move correspondingly. In this embodiment both piston systems (13, 14) are unidirectional. In some example embodiments, the relative motion between piston systems are depends on types of piston systems, types of piston mechanical links and the mechanical link that couples all piston mechanical links. [0046] Main piston (13’) in main piston system (13) and auxiliary piston (14’) in auxiliary piston system (14) divide their respective casings into two chambers. As described in the Figure. 1, the main casing (11) is divided by main piston (13’) in to main casing first chamber (1G) and main casing second main chamber (11”)· The auxiliary casing (12) is divided by auxiliary piston (14’) into auxiliary casing first chamber 12’ and auxiliary casing second chamber (12”). In some example embodiments, each chamber from each casing is having ports for actuation. The main casing first chamber (1 G) is connected to main casing first chamber port (17a) and main casing second chamber (11”) is connected to main casing second chamber port (17b). The auxiliary casing first chamber (12’) is connected to auxiliary casing first chamber port (18a) and auxiliary casing second chamber (12”) is connected to auxiliary casing second chamber port (18b).

[0047] FIG. 2 illustrates a schematic view of the actuating system with one main casing

(11) and one auxiliary casings with a circuit comprises a plurality of valves, in accordance with an example embodiment of the present disclosure. In some example embodiments, the pneumatic actuating system (1) along with actuating pneumatic circuit comprises a plurality of valves i.e., forward stroke valve VI, reverse stroke bypass valve V2, and forward stroke vent valve V3. The circuit is connected to pressurized air source and low-pressure vent (mostly atmospheric air) as described in the Figure 2. In the circuit forward stroke, valve VI downstream is connected to main casing first chamber port (17a) and upstream of reverse stroke bypass valve V2. The downstream of forward stroke bypass valve V2 is connected to the main casing second chamber port (17b) and auxiliary casing second chamber port (18b) and upstream of forward stroke vent valve V3. Downstream of forward stroke vent valve V3 and auxiliary casing first chamber port (18a) are connected to vent.

[0048] In some example embodiments, for the forward stroke or power stroke the forward stroke valve VI and the forward stroke vent valve V3 are in open condition and the reverse stroke bypass valve V2 is in closed condition. In this condition the pneumatic actuating system (1) is activated with high pressure air which enters in to the main casing first chamber (1 G) and at the same instant the main casing second chamber (11”) and the auxiliary casing second chamber (12”) are vented to prevent any pressure buildup. Then the main piston (13’) starts moving (against external force F) along with main piston rods (13”) due to the differential pressure on the main piston (13’). As both main piston system (13) and auxiliary piston system (14) are linked with a mechanical link (16), both piston systems (13, 14) move to complete forward stroke. This movement ends when any piston system is restricted by either a physical restriction in casings (11, 12) or by excess force from external system. In any case at the end of the forward stroke the volume of both main casing first chamber (1 G) and auxiliary casing first chamber (12’) is highest and at the same instant both main casing second chamber (11”) and auxiliary casing second chamber (12”) are minimum. In the course of forward stroke, the force is transferred from mechanical link (20) to external systems. After the end of the forward stroke all valves will come to close condition to make system locked in desired condition if needed.

[0049] For the return stroke, forward stroke valve V 1 and forward stroke vent valve V3 are in closed condition and reverse stroke bypass valve V2 is in open condition. In this condition for the return stroke no external source of high-pressure air is needed but the high- pressure air in the main casing first chamber travels through the reverse stroke bypass valve V2 and enters both main casing second chamber (11”) and auxiliary casing second chamber (12”). The auxiliary piston diameter compared to the main piston diameter is such that the resultant force is always towards return direction. In the course of reverse stroke, the force transfer from mechanical link (20) to external systems. The high-pressure air in the main casing first chamber 1 G at the end of the forward stroke is expanded to total volume of main casing second chamber 11” and auxiliary casing second chamber 12”. This results in reduction in the pressure at the end of the return stroke which leads to reduction in the return stroke force F on the external system. The force F by the pneumatic actuating system 1 for forward stroke and return stroke was briefly described in the Figure. 9. By selecting a sufficient diameter of the auxiliary piston the designer can attain the required force F at start of the return stroke but at the cost of force at the end of the return stroke.

[0050] As described above the pneumatic actuating system (1) consumes high pressure air only for the forward stroke. The high-pressure air not required for the return stroke; thus, the energy is saved in the return stroke. This way the pneumatic actuating system (1) is more efficient compared to a generic pneumatic actuator which consumes high pressure air for both forward and return strokes.

[0051 ] FIG. 3 illustrates a schematic view of the actuating system with one main casing

(11) and one auxiliary casing with a circuit consists of standard valves: spool valve, non-retum valve, in accordance with an example embodiment of the present disclosure. In some example embodiments, the pneumatic actuating system (1) comprises a circuit with standard spool valve (19) and a non-return valve NRV instead of a greater number of valves VI, V2, V3. Advantage of using spool valve (19) is to reduce number of operations to operate the circuit. With the circuit with standard 5/3 spool valve with single operation of the valve (19) either for forward stroke or return stroke same results can be achieved as the circuit described in Figure 2. Spool valve block (19a) is the forward block to activate the pneumatic actuating system for the forward stroke. Spool valve block (19b) is the block to activate the pneumatic actuating system for the reverse stroke. Such spool valve 19 may be activated with solenoid, hand lever, foot pedal or cam etc. It is to be noted that the Figure 3. circuit is not limited to operate the pneumatic actuating system (1) but with different combinations of standard valves same results of may be achieved. [0052] Figures 4 -6 illustrates another embodiment of present disclosure of a pneumatic actuating system (2) and activation circuit for pneumatic systems. FIG. 4 illustrates a sectional view of the actuating system with one main casing (11) and one auxiliary casing in tandem orientation, in accordance with an example embodiment of the present disclosure. The pneumatic actuating system (2) described in Figure 4 comprises a main casing (11) and an auxiliary casing (12). Both main casing (11) and auxiliary casing (12) are in co-axial & tandem in arrangement and are rigidly linked with a mechanical link (15). The pneumatic actuating system comprises a first end and a second end. In this embodiment, the mechanical link 15 is an integration of both casings 11, 12 with a manufacturing process for example welding, casting, forming etc. Each of the main casing (11) and auxiliary casing (12) are divided by respective piston systems i.e., main piston system (13) for main casing (11) and auxiliary piston system (14) for auxiliary casing. Each piston system consists of pistons i.e., main piston (13’), auxiliary piston (14’) and piston mechanical links (13”, 14”). The piston mechanical links (13”, 14”) from said piston systems (13, 14) are linked with a mechanical link system (16). In this embodiment, the mechanical link (16) is a rigid joint for example by welding, mounted on same shaft, or screw joint etc. Due to the mechanical link (16) said piston systems (13, 14) mimic the movement, in case any one of the piston system is forced to move then other piston system move correspondingly. In some example embodiments, both piston systems (13, 14) are unidirectional. But for other embodiments, the relative motion between piston systems are depends on types of piston systems, types of piston mechanical links and the mechanical link that couples all piston mechanical links.

[0053] Main piston (13’) in main piston system (13) and auxiliary piston (14’) in auxiliary piston system (14) divide their respective casings in to two chambers. As described in the Figure 4, the main casing (11) is divided in to main casing first chamber (I E) and main casing second main chamber (11”). The auxiliary casing (12) is divided in to auxiliary casing first chamber (12’) and auxiliary casing second chamber (12”). Each chamber from each casing is having a port for actuation. The main casing first chamber (I E) is connected to main casing first chamber port (17a) and main casing (11) second chamber (11”) is connected to main casing second chamber port (17b). The auxiliary casing first chamber (12’) is connected to auxiliary casing first chamber port (18a) and auxiliary casing second chamber (12”) is connected to auxiliary casing second chamber port 18b.

[0054] FIG. 5 illustrates a schematic view of the actuating system with one main casing

(11) and one auxiliary casing with a circuit comprises a plurality of valves, in accordance with an example embodiment of the present disclosure. In some example embodiments, the pneumatic actuating system (2) with actuating pneumatic circuit comprises a plurality of valves i.e., forward stroke valveVl, reverse stroke bypass valve V2, and forward stroke vent valve V3. The circuit is connected to pressurized air source and low-pressure vent (mostly atmospheric air) as described in the Figure 5. In the circuit, forward stroke valve VI is connected to main casing first chamber port (17a) and upstream of reverse stroke bypass valve V2. The downstream of forward stroke bypass valve V2 is connected to main casing second chamber port (17b) and auxiliary casing second chamber port (18b) and upstream of forward stroke vent valve V3. Downstream of forward stroke vent valve V3 and auxiliary casing first chamber port 18a are connected to vent.

[0055] For the forward stroke or power stroke said forward stroke valve VI and forward stroke vent valve V3 are in open condition and said reverse stroke bypass valve V2 is in closed condition. In this condition, the pneumatic actuating system (1) is activated with high pressure air which enters in to the main casing first chamber (I E) and at the same instant main casing (11) second chamber (11”) and auxiliary casing second chamber (12”) are vented to prevent any pressure build up. Then the main piston (13’) starts moving (against external force F) along with main piston rods (13”) due to the differential pressure on the main piston (13’). As both main piston system (13) and auxiliary piston system (14) are linked with a mechanical link (16), both piston systems 13 and 14 moves to complete forward stroke. This movement ends when any piston system is restricted by either a physical restriction in casings (11, 12) or by excess force from external system. In any case, at the end of the forward stroke the volume of both main casing first chamber (1 G) and auxiliary casing first chamber (12’) is highest and at the same instant both main casing second chamber (11”) and auxiliary casing second chamber (12”) are minimum. In the course of forward stroke, the force transfer from mechanical link (20) to external systems. After the forward stroke ended at that instant all valves will come to close condition to make system locked in desired condition if needed. [0056] For the return stroke, forward stroke valve V 1 and forward stroke vent valve V3 are in closed condition and reverse stroke bypass valve V2 is in open condition. In this condition for return stroke no external source of high-pressure air is needed but the high- pressure air in the main casing first chamber travels through the reverse stroke bypass valve V2 and enters both main casing second chamber (11”) and auxiliary casing second chamber (12”). The auxiliary piston diameter compared to the main piston diameter is such that the resultant force is always towards return direction. In the course of reverse stroke, the force transfer from mechanical link (20) to external systems. The high-pressure air in the main casing first chamber (11 ’) at the end of the forward stroke is expanded to total volume of main casing second chamber (11”) and auxiliary casing second chamber (12”). This results in reduction in the pressure at the end of the return stroke which may leads to reduction in the return stroke force F on the external system. The behaviour of force F by the pneumatic actuating system 1 for forward stroke and return stroke was briefly described in the figure 9. By selecting a sufficient diameter of the auxiliary piston, the designer can attain the required high force F at start of the return stroke but at the cost of force at the end of the return stroke. [0057] As described above the pneumatic actuating system 1 consumes high pressure air only for the forward stroke. The high-pressure air not required for the return stroke will be saved. This way the pneumatic actuating system (1) is more efficient compared to a generic pneumatic actuator which consumes high pressure air for both forward and return strokes. [0058] FIG. 6 illustrates a schematic view of the actuating system with one main casing

(11) and one auxiliary casing with circuit comprises standard valves: spool valve, non-return valve, in accordance with an example embodiment of the present disclosure. In some example embodiments, the pneumatic actuating system (2) along with a circuit with standard 5/3 spool valve (19) and non-return valve NRV instead of a greater number of valves VI, V2, V3. With the new circuit with standard 5/3 spool valve with single operation of the valve (19) either for forward stroke or return stroke same results can be achieved as the circuit described in Figure 6. 19a is the forward block to activate the pneumatic actuating system for the forward stroke. 19b is the block to activate the pneumatic actuating system for the reverse stroke. Such spool valve 19 can be activated with solenoid, hand lever, foot pedal or cam etc.

[0059] Figures 7 & 8 illustrate another embodiment of present disclosure of a pneumatic actuating system for pneumatic systems. FIG. 7 illustrates an isometric view of the actuating system with one main casing (11) and one auxiliary casing with cross configuration, in accordance with an example embodiment of the present disclosure. In some example embodiments, the pneumatic actuating system (3) comprises a main casing (11) and an auxiliary casing (12). Both the main casing (11) and the auxiliary casing (12) are in cross configuration and tandem arrangement and are rigidly linked with a mechanical link (15). In this case, the mechanical link ( 15) is a common mounting structure or rigid mounting on ground basement. The pneumatic actuating system comprises a first end and a second end. As described in Figure 8, both main casing (11) and auxiliary casing (12) are divided by respective piston systems i.e., main piston system (13) for main casing (11) and auxiliary piston system (14) for auxiliary casing (12). Each piston system consists of pistons: main piston 13’, auxiliary piston 14’; and piston mechanical links: main piston mechanical link 13”, auxiliary piston mechanical link 14”. In this embodiment the main piston mechanical link 13” is a cable with pulley system, whereas other auxiliary piston mechanical link 14” is a piston rod. Both main piston mechanical link 13” and auxiliary piston mechanical link 14” from main piston systems 13 and auxiliary piston system 14 are again linked with a mechanical link system 16. In this embodiment the mechanical link 16 is a rigid joint for example: Screw joint, Friction joint Coupling etc. Due to the mechanical link 16 all piston systems 13, 14 mimic the movement in their respective casings if any one of the piston systems is forced to move. In this embodiment both piston systems 13, 14 are perpendicular. So, their relative movement is perpendicular. But for other embodiments the relative motion between piston systems is dependent on types of piston systems, types of piston mechanical links and the mechanical link that couples all piston mechanical links.

[0060] Main piston (13’) in main piston system (13) and auxiliary piston (14’) in auxiliary piston system (14) divide their respective casings into two chambers. As described in the Figure 8, the main casing (11) is divided in to main casing first chamber (I E) and main casing second main chamber (11”). The auxiliary casing (12) is divided into auxiliary casing first chamber (12’) and auxiliary casing second chamber (12”). Each chamber from each casing is having ports for actuation. The main casing first chamber (I E) is connected to main casing first chamber port (17a) and main casing second chamber (11”) is connected to main casing second chamber port (17b). The auxiliary casing first chamber (12’) is connected to auxiliary casing first chamber port (18a) and auxiliary casing second chamber (12”) is connected to auxiliary casing second chamber port (18b).

[0061 ] Pneumatic actuating system (3) described in present embodiment needs to have same kind of actuation circuit described for embodiment 1 and embodiment 2. The ports 17a, 17b, 18a, 18b of pneumatic actuating system 3 in present embodiment 3 connected in the same way it was described in embodiment 1 and embodiment 2 for both circuits either with valves VI, V2, V3 or with a spool valve 19 & NRV.

[0062] For the forward stroke or power stroke forward stroke, valve V 1 and forward stroke vent valve V3 are in open condition and reverse stroke bypass valve V2 is in closed condition. In this condition the pneumatic actuating system (1) is activated with high pressure air which enters in to the main casing first chamber (I F) and at the same instant main casing second chamber (11”) and auxiliary casing second chamber (12”) are vented to prevent any pressure build up. Then the main piston (13’) starts moving (against external force F at mechanical link (20) to external system) along with cable (13”) due to the differential pressure on the main piston (13’). As both main piston system (13) and auxiliary piston system (14) are linked with a mechanical link (16), both piston systems (13) and (14) moves to complete forward stroke. This movement ends when any piston system is restricted by either a physical restriction in casings (11, 12) or by excess force from external system. In any case, at the end of the forward stroke the volume of both main casing first chamber (I F) and auxiliary casing first chamber (12’) is highest and at the same instant both main casing second chamber (11”) and auxiliary casing second chamber (12”) are minimum. In the course of forward stroke, the force transfer from mechanical link (20) to external systems. After the forward stroke ended at that instant all valves will come to close condition to make system locked in desired condition. [0063] For the return stroke, forward stroke valve V 1 and forward stroke vent valve V3 are in closed condition and reverse stroke bypass valve V2 is in open condition. In this condition for return stroke no external source of high-pressure air is needed but the high- pressure air in the main casing first chamber travels through the reverse stroke bypass valve V2 and enters both main casing second chamber (11”) and auxiliary casing second chamber (12”). The auxiliary piston diameter compared to the main piston diameter is such that the resultant force is always towards return direction. In the course of reverse stroke, the force transfer from mechanical link (20) to external systems. The high-pressure air in the main casing first chamber (11 ’) at the end of the forward stroke is expanded to total volume of main casing second chamber (11”) and auxiliary casing second chamber (12”). This results in reduction in the pressure at the end of the return stroke which may leads to reduction in the return stroke force F on the external system. The force F behaviour by the pneumatic actuating system (3) for forward stroke and return stroke was briefly described in the Figure 10. By selecting a sufficient diameter of the auxiliary piston, the designer can attain the required high force F at start of the return stroke but at the cost of force at the end of the return stroke.

[0064] FIG.9 illustrates the actuating system with a main casing (11) and auxiliary casing (12) with a circuit consist of valves VI, V2, V3 with connections between respective casings and pistons of main casing (11) and auxiliary casing, in reverse configuration in accordance with an example embodiment of the present disclosure. The pneumatic actuating system (1) along with actuating pneumatic circuit comprises a plurality of valves i.e., forward stroke valve VI, reverse stroke bypass valve V2, and forward stroke vent valve V3. The circuit is connected to pressurized air source and low-pressure vent (mostly atmospheric air) as described in the Figure 9. In the circuit forward stroke, valve VI downstream is connected to main casing first chamber port (17a) and upstream of reverse stroke bypass valve V2. The downstream of forward stroke bypass valve V2 is connected to the main casing second chamber port (17b) and auxiliary casing second chamber port (18b) and upstream of forward stroke vent valve V3. Downstream of forward stroke vent valve V3 and auxiliary casing first chamber port (18a) are connected to vent.

[0065] In some example embodiments, for the forward stroke or power stroke the forward stroke valve VI and the forward stroke vent valve V3 are in open condition and the reverse stroke bypass valve V2 is in closed condition. In this condition the pneumatic actuating system (1) is activated with high pressure air which enters in to the main casing first chamber (1 ) and at the same instant the main casing second chamber (11”) and the auxiliary casing second chamber (12”) are vented to prevent any pressure buildup. Then the main piston (13’) starts moving (against external force F) along with main piston rods (13”) due to the differential pressure on the main piston (13’). As both main piston system (13) and auxiliary piston system (14) are linked with a mechanical link (16), both piston systems (13, 14) move to complete forward stroke. This movement ends when any piston system is restricted by either a physical restriction in casings (11, 12) or by excess force from external system. In any case at the end of the forward stroke the volume of both main casing first chamber (1 G) and auxiliary casing first chamber (12’) is highest and at the same instant both main casing second chamber (11”) and auxiliary casing second chamber (12”) are minimum. In the course of forward stroke, the force is transferred from mechanical link (20) to external systems. After the end of the forward stroke all valves will come to close condition to make system locked in desired condition if needed.

[0066] For the return stroke, forward stroke valve V 1 and forward stroke vent valve V3 are in closed condition and reverse stroke bypass valve V2 is in open condition. In this condition for the return stroke no external source of high-pressure air is needed but the high- pressure air in the main casing first chamber travels through the reverse stroke bypass valve V2 and enters both main casing second chamber (11”) and auxiliary casing second chamber (12”). The auxiliary piston diameter compared to the main piston diameter is such that the resultant force is always towards return direction. In the course of reverse stroke, the force transfer from mechanical link (20) to external systems. The high-pressure air in the main casing first chamber 1 G at the end of the forward stroke is expanded to total volume of main casing second chamber 11” and auxiliary casing second chamber 12” . This results in reduction in the pressure at the end of the return stroke which leads to reduction in the return stroke force F on the external system. The force F by the pneumatic actuating system 1 for forward stroke and return stroke was briefly described in the Figure. 10. By selecting a sufficient diameter of the auxiliary piston the designer can attain the required force F at start of the return stroke but at the cost of force at the end of the return stroke.

[0067] As described above the pneumatic actuating system (3) consumes high pressure air only for the forward stroke. The high-pressure air not required for the return stroke will be saved. This way the pneumatic actuating system (3) is more efficient compared to a generic pneumatic actuator which consumes high pressure air for both forward and return strokes. [0068] Spool valve (19) circuit described for both embodiment ( 1 ) and embodiment (2) are also applicable for the present embodiment (3). Now describing the present embodiment (3) with the pneumatic actuating system 3 along with a circuit with standard 5/3 spool valve 19 and non-return valve NRV instead of a greater number of valves VI, V2, V3. With standard 5/3 spool valve with single operation of the valve (19) either for forward stroke or return stroke same results can be achieved as the circuit described for embodiment 1 and embodiment 2. 19a is the forward block to activate the pneumatic actuating system for the forward stroke. 19b is the block to activate the pneumatic actuating system for the reverse stroke. Such spool valve 19 can be activated with solenoid, hand lever, foot pedal or cam etc.

[0069] In all above embodiments described above, the auxiliary casing first chamber

(12’) breath-in and breath-out air from the downstream of V3 or from vent. This way said auxiliary casing first chamber (12’) avoid building pressure or vacuum to nullify the effect the pressure in the auxiliary casing first chamber (12’) on resultant force F.

[0070] As described above the pneumatic actuating system (1) consumes high pressure air only for the forward stroke. The high-pressure air not required for the return stroke; thus, the energy is saved in the return stroke. This way the pneumatic actuating system (1) is more efficient compared to a generic pneumatic actuator which consumes high pressure air for both forward and return strokes.

[0071 ] In some example embodiments, the pneumatic actuating system and the circuit may be formed with different types of elements available in pneumatic systems. The variations in main casing type (11), Auxiliary casing type (12), Orientation between the main casing (11) and auxiliary casing (12), mechanical link between the main casing piston system and auxiliary casing piston system, types of mechanical link, types of circuits are listed below. It is to be noted that the illustration embodiments and this variation is only for illustration purpose. The disclosure or these variations do not intend limit the scope of the invention.

[0072] Main casing type:

1. Liner actuation

2. Rotary actuation

[0073] Auxiliary casing type:

1. Liner actuation

2. Rotary actuation

[0074] Orientation between main casing and auxiliary casing:

1. Collinear

2. Parallel

3. Cross

4. Angle

5. Off-set

6. Tandem

[0075] Mechanical link between main casing piston system and auxiliary casing piston system:

1. Bracket

2. Hydraulic 3. Cable/flexible member

4. Magnetic

5. Gear/ rack and pinion

[0076] Type of mechanical link to transfer force from main piston system to external system:

1. Piston rod

2. Shaft

3. Cable

4. Magnetic

5. Piston mount

[0077] Type of circuit elements:

1. Individual valves

2. Spool valve

3. 3 way/ 4 way valve

[0078] Embodiments are describing very limited variability of main elements of present disclosure. With above key elements types of constituents of present disclosure can be evolved in different embodiments with skills of an expert in domain of pneumatic and mechanical systems

[0079] The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practised with modification within the spirit and scope of the embodiments as described herein.