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JP2000234601A |
To provide an electrical hydraulic servo actuator with redundancy suitable for fail safe. In a redundant control system, a logic crossing coupling is arranged between independent servo actuators 101A and 101B that have hydraulic actuator...
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JP3076743B2 |
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JP2000213502A |
To provide a compact and highly reliable electrohydraulic servo motor having reduced shaft length despite the adoption of a spool valve. This electrohydraulic servo motor is provided with a first helical gear 44 connected with an output ...
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JP2000213501A |
To provide an electrohydraulic servo motor having compact structure by improving the arrangement of a spool valve. This electrohydraulic servo motor is provided with a main spool valve 54, which is arranged normal to an output shaft 34 a...
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JP2000213503A |
To provide a device capable of largely reducing spool fluctuation causing micro-vibration (background vibration) of a hydraulic actuator. A micro-vibration reducing device consists of a hydraulic pump 21, a supply pressure (electric) fee...
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JP2000205202A |
To provide an electro-hydraulic servo motor having a compact structure by devising the arrangement of a control valve. This servomotor comprises a first helical gear 49 connected to an output shaft 34, second helical gears 52, 53 screw c...
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JP2000199242A |
To allow a lockout state to be an overriding state by a control unit temporarily by making a lockout state in response to the signal of a sensor for detecting and indicating an operation state, and also making the lockout state into an o...
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JP2605420Y2 |
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JP2000170704A |
To increase stability by providing an error exclusion section adding or averaging and feeding-back the differential pressure between hydraulic actuators with their output rods constrainedly operated together.Stationary cylinders 6a, 6b g...
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JP3044189B2 |
PURPOSE: To suppress excessive acceleration of a tilling apparatus and to perform smooth control of lifting motion. CONSTITUTION: This lift controlling apparatus is provided with a positional deviation detection means A to get the deviat...
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JP2000120603A |
To provide an intelligent hydraulic actuator, in which control facilities are distributed around devices to be controlled, the processing performance of the system can be improved, and both reliability and flexibility can be enhanced, by...
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JP2000110802A |
To control the position of a cylinder at high stopping accuracy only by an air source in a place having no hydraulic source and to be used under a high-temperature atmosphere by constituting a drive source of a cylinder of a pneumatic dr...
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JP3028943B2 |
To provide an automatic tracking system provided with an infrared wide angle sensor for improving the influence of noise generated by the separation from a device main body of a point to be measured capable of omitting work for initial c...
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JP3026173B2 |
To provide a driving control device which can sufficiently restrain oscillation characteristic in a resonance system and can stably work a mold oscillation device in a desired operation waveform. In a control device 60 according to a com...
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JP3026174B2 |
To stably work an oscillation device by restraining the oscillation characteristic. A control device 30 contains a driving waveform generating means 34 for generating a command value of spool position and the command speed of the spool f...
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JP2000081003A |
To facilitate control of the vibration amplitude and the advance/retreat position of a single rod type cylinder. This control device comprises a hydraulic pump 15 connected to an oil pressure chamber 12 on the rod side, a first solenoid ...
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JP2000055001A |
To provide a hydraulic valve system to recover a valve even from a stop due to dust to a normal state with minimizing scratches caused on the valve in the worst case. A hydraulic valve control system operates a valve through a valve cont...
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JP2000046005A |
To synchronize the ascending/descending movement of first and second hydraulic cylinder devices by a simple structure, and also improve the distributivity of pipings between both these hydraulic cylinder devices. In this synchronous hydr...
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JP2998919B2 |
PURPOSE: To provide a compact rotary actuator with good torque transmission efficiency and log life. CONSTITUTION: This rotary actuator 11 is provided with a hollow cylinder tube 20, a piston 17 which slides inside the cylinder tube 20, ...
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JP2000009101A |
To safely, positively carries out actuation, including steering, turning movement at an appropriate speed required in the entire travelling speed region. Each of hydraulic control systems, 15A, 15B, 15C has a hydraulic pump 17 independen...
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JPH11351201A |
To suppress the wasteful consumption of a pressurized fluid by detecting the irreducible minimum control pressure to operate an actuator from the supply pressure of a pressurized fluid supply source to operate the actuator. A pressurized...
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JP2986328B2 |
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JP2986329B2 |
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JPH11325001A |
To ensure a stable changeover control of a plurality of flow control valves, a highly accurate following control to a wide range of varied target value, and a stable control even in the case of disturbance. A flow control device is provi...
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JP2972555B2 |
A device for sensing actuator operating signal in a hydraulic system is disclosed. The device has auxiliary valves directly coupled to the directional control valves respectively, the internal lines of which auxiliary valves are opened o...
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JPH11294401A |
To reduce the generation of power, to reduce manufacturing cost through reduction of the number of parts, and besides to reduce size. This positioner comprises a first and second ON/OFF valves 44 and 46 connected in parallel to the outpu...
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JPH11294402A |
To control hydraulic valve even at failure of a position detecting means by providing the position control means of a spool based on the output signal of a position setting means, and a failure judging means for the position control mean...
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JP2967077B2 |
An operating device of a friction clutch arranged in the drive train of a motor vehicle, having a positioning servo arrangement with a pressure medium power cylinder arrangement located inside the housing bell and acting on a clutch rele...
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JP2963867B2 |
To provide a width changing device of a mold which executes the width change of the mold by enlarging the shifting stroke of a short side frame without stopping an operation so as to cast a cast slab of narrow width to wide width and to ...
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JPH11277207A |
To effectively prevent an out-of-step by an abrupt load increase by correcting the opening/closing command of the opening/closing means installed to a pouring nozzle to a continuous casting mold by an out-of-step avoidance circuit when t...
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JPH11272332A |
To provide a positioning cylinder device capable of easily changing stroke end position of a piston rod. The positioning cylinder device is provided with a cylinder body 1 including a piston 2 in its inside, a hollow piston rod 3 extende...
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JP2952230B1 |
[wrap up] [Task] Provided are a multi-system servo actuator control device and a multi-system control device that can be easily adjusted to eliminate variations while maintaining independence between systems. The control circuits 2a to 2...
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JPH11249746A |
To perform stable servo control by fixing a servo gain corresponding to the position of the piston of a cylinder. A variable amplifier 20 for regulating the servo gain is provided between a control circuit 5 and a solenoid valve 3. The g...
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JPH11231902A |
To provide a valve positioner capable of dealing with the abnormality of a microprocessor even in various control valves having respectively different parameters. The valve positioner having a microprocessor 1 for sending a deviation bet...
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JP2598238Y2 |
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JP2920883B2 |
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JP2919261B2 |
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JP2916847B2 |
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JPH11173305A |
To obtain a servo valve having high reliability using a feedback mechanism having no effect of electromagnetic noise, by making a laser beam be incident onto a light reflecting part provided on a movable part connected to a spool, and al...
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JPH11171495A |
To simplify a circuit (hardware) required in the light of feedback control over the. current value of a solenoid valve, and to secure its relatively high responsiveness, in an industrial vehicle. A central processing unit performs a comp...
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JPH11171496A |
To simplify a circuit (hardware) required in the light of feedback control over a current value flowing into the solenoid of a solenoid valve. A central processing unit 54 controls the current value of a solenoid valve installed in a hyd...
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JPH11171499A |
To control an electric current so stably in a transient area irrespective of any disturbance factor such as variations in supply voltage and solenoid resistance, etc., at the time of controlling the current value of a solenoid valve inst...
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JPH11171498A |
To stabilize a current characteristic in the transient area of an electric current independently of any disturbance factors such as variations and so on in battery voltage and solenoid resistance, even if current value control over a sol...
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JPH11148502A |
To eliminate problems with a conventional locating device for air cylinder such that stopping at the intended destination can not be obtained due to a delay caused by an air flow if the piston position is controlled only with air cylinde...
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JP2892451B2 |
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JPH11125204A |
To improve the responsiveness of a device by simplifying the structure of an explosion-proof case and shortening a distance between a nozzle and a pneumatic amplifier. An attaching base 121 is attached to an outer wall of an explosion-pr...
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JPH11125203A |
To facilitate the assembly works and electrical connecting works of a first and a second printed wiring boards into a case to improve an assembly work ability. The first and the second printed wiring boards 65A, 65B are attached to the b...
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JPH11125202A |
To facilitate the assembly and adjustment of a feedback mechanism for improving their working ability. The peripheral wall of an explosion-proof case 6 is provided with a circular outer wall 81 being protruded outward and a circular inne...
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JPH11108082A |
To control a hydraulic actuator adequately, even when the operating amount of the electromagnetic actuator to a control current is changed. The output side of a control unit 17 is connected to the electromagnetic actuator 16 of a control...
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JPH1193903A |
To perform positioning of a cylinder with a built-in valve for positioning control with high precision, to improve durability of a seal and a bearing, and to reduce size. A nut 2 is attached to the piston rod 1 of a hydraulic cylinder, a...
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