FIELD OF THE INVENTION The invention relates to the field of the acceleration of material, in particular streams of granular or particulate material, with the aid of centrifugal force, with the aim of causing accelerated stream of grains or particles to collide with at least a stationary impact member at such a velocity that they are crushed, but other possible applications are not excluded. BACKGROUND TO THE INVENTION

A stream of particle material can be accelerated in a crusher housing with the aid of centrifugal force. With this technique the material is normally fed onto the centre part of a rotor that rotates rapidly about a vertical axis of rotation, which material and then collected by one or more sliding members for accelerating of the material with the aid of centrifugal force, which accelerated material is then thrown around from the rotor at high velocity to impact (or collide) with a stationary impact member that surround the rotor, for which the impact member is provided with an impact face that is transversally directed to the thrown accelerated stream of particles.

The crushing housing comprises a drum member of which the drum wall stretches in vertical direction with on top a removable lid member; the impact member stretches along the drum wall and is carried by the crusher housing, either by the drum wall or with the aid of a cage member for easy exchange, a configuration known from US 5,806,774 (Vis), and can also be carried by the lid member, a configuration known from US 7,854,407 (Potter et al).

The stationary impact member can be an armoured ring with protruding corners, also called anvils, of which the impact faces are directed perpendicular to the flight path, creating an impact member composed with so called anvils that have protruding corners, creating a surrounding knurled face, a configuration known from US Des 362,450 (Bajadali) and US 4,699,326 (Warren). The anvils from the known configuration have the advantage that they can be positioned closely around the rotor which limits the diameter of the anvil ring, but have the disadvantage that the protruding corners disturb the particle movement as well as the air stream, again at the expense of impact intensity, wear and energy; moreover, and the anvils wear off rapidly, which strongly reduces the impact intensity and limits the service time. The anvil ring can be combined with autogenous impact, a configuration known from US 5,639,030 (Watajima). An anvil ring can also be positioned at larger radial form the rotor, a configuration known from WO 2004002629, which drawn is name of applicant, that requires a larger diameter drum member, but has the advantage that significant more wear material is available, translating in longer wear life, much lower wear around the outer edge of the rotor, less turbulence in the crusher housing.

Instead of an armoured ring with protruding anvils it is also possible to position a stator around the rotor which has the advantage that the impact intensity that is generated remains constant when the stator impact face wears off, that much more stator wear material can be effectively utilized, and that particles traffic and the air stream are not hindered by the protruding corners; and such configuration is known from WO 0207887 which is drawn in the name of applicant, and explains that the stator has to be positioned at a rather large radial distance from the rotor to obtain a reasonable angel of impact.

The anvils are normally carried with the aid of a cage member, liftable in and out of the drum member with the anvils. Normally are two cage members available for direct and quick exchange, and the other cage member is prepared for the next exchange when time is available. Cage members are therefore popular, but to be liftable, sufficient space has to be available between the cage member and the drum member, increasing the diameter of the drum member.

The stationary impact member can be out of one piece, but involves normally a plurality of impact block members, which are positioned next to each other creating a composed impact member, either a composed anvil impact member, or a composed stator impact member. A one-piece impact member has the advantages over a composed impact member, no need a cage member for easy exchange, no need attachment means to keep the stator in place, which present considerable saving on weight, yet significant lower amount of throw-away material, and limits the diameter of the drum, though liftability requires also here certain free space between the stator and the drum wall; casting and transport of a one-piece impact member is more difficult, hence significant more expensive than a composed impact member, and is not practical with ceramic inserts, reason why a composed impact member is normally preferred.

A composed impact member has certain shortcomings. The centre parts of the impact faces wear out gradually around during service, and wear can develop and concentrate at locations where the impact face has been accidently damaged, and along the joints between the impact member elements, and it has to be avoided that one of the impact members wears through, also called burn through, which can cause damage to the construction behind the impact member, including the attachment members. This problem can be avoided to certain extend when the impact ring is positioned at a larger radial distance from the rotor, and sufficient space can be created between the drum wall and the impact ring, such that this space fills with own material when the stator starts to wear through - called a close inner space - and a bed of own material is created that is compacted by repetitive impact creating a partial metal/autogenous impact face that provides still good impact intensity, which means that effective service time is increased because more wear material is effectively utilized. Such configuration with closed inner space is known from WO 2004002629 (cited before), and is in particular effective with a stator like impact ring, but this technique can also be applied with a composed impact face with collision relief, essentially an anvil ring positioned at larger radial distance from the rotor an anvil ring.

The known configuration with closed inner space has proven to be very effective, however, due to variations in the abrasiveness or abrasive loading during service, it often happens that a certain part along the impact face wears through whilst the remaining part is still suitable for service, that is, for processing a significant amount of particle material. But the part that wears through present the weakest link and requires exchange of the whole ring, with the result that much expensive wear material has to thrown away. To avoid damage, exchange is often performed somewhat premature to be on the safe side, adding to the amount of throw-away material, which is costly and limits service time. In particular with a stator it is therefore preferred to limit the number of stator segments, yet the number of joints between the stator segments, which have a tendency to wear off faster when ceramic inserts are applied which have to be positioned at certain distance of the outer surface, but this means that rather heavy segments have to be exchanged, involving however less segments.

With a composed stator like impact ring, the stator segments can be carried directly by the drum member, preferably such that closed inner space is created providing sufficient depth for the creation of an effective partly autogenous impact face, though further increasing the drum diameter, or limiting the radial distance between the rotor and the impact face, resulting in more angled, yet less effective, angle of impact. The situation gets worse when the stator segments are placed in a cage, further increasing the drum diameter, or accepting more angled impact causing also a higher wear rate - taken also into account that much more weight has to be lifted, which requires a rather heavy cage construction.

The known configuration with composed impact member that provides a closed inner space has also a problem that one of the impact members can wear through completely such that an impact block member splits, that is, that the upper half of the impact block member becomes separated from the lower half and collapses into the crusher chamber, which can cause serious damage to the rotor and other parts of the crusher and related devices - as well to the drum construction behind the impact block member. The composed stator member has therefore to be exchanged in time, that is, before one of the impact members wears through completely, which can leave much unused throw away wear material.

Summarized, the application of a composed stator like impact ring with the impact face, positioned at large enough radial distance from the rotor to obtain an effective angle of impact, that is >70 degrees, provided with a closed inner space between the stator and the drum wall or cage wall, known from WO 0207887 and WO 2004002629 (both drawn in name of applicant) poses certain very interesting advantages; that is, in particular, avoiding a drop in impact intensity when the stator wears of, as is the case with an anvil ring, processing a broken product of constant quality; that a closed inner space can be applied to prolong wear life of the impact ring, increasing the amount of wear material that can be effectively utilized, which, together with the high mass of the larger diameter impact ring, increases wear life significantly - redoubling wear life when compared to anvil ring; but poses also certain practical problems, that is, that the application of a cage construction increases the required diameter of the drum member, which is limited for practical reasons, leaving only the option to limit the radial distance between the rotor and the impact face, accepting more angled impact, generating less impact intensity, but increasing wear rate; and, most important, that stator segments can split when they wear through when partly autogenous impact is applied, and the upper part or lower part of the stator segment can collapse into the crusher housing, causing considerable damage to the construction, and requires that the stator segments have to be exchanged prematurely to avoid this problem, at the expense of amount the wear material that can be effectively utilized.

AIM OF THE INVENTION

The aim of the invention is, therefore, to provide a composed impact member that provides a closed inner space, as described in some detail before, that does not have these disadvantages, or at least displays these to a lesser extent;

The principal aim of the invention is to provide a simple construction of a composed impact member that is more wear efficient and prevents that damage occurs to the crushing housing when one of the impact block members wears through completely and splits, and makes it possible to effectively utilize a maximum amount of the wear material of the sliding block; Another aim of the invention to provide the impact block member with simple attachment means for easy and quick exchange, that enables effective utilization of ta maximum amount of wear material;

Another aim of the invention is to provide the crusher housing with a simple instalment assembly for easy instalment of the impact block members in the crusher housing.

Another aim of the invention is to provide a simple liftable cage member construction that carries the composed impact member, and enables to position the composed impact face at maximum radial distance from the rotor.

BRIEF SUMMARY

This Brief Summary is provided to introduce simplified concepts relating to the aim of the invention, which is further described below in the Detailed Description. This summary is not intended to identify essential features of the claimed subject matter, nor is it intended for use in determining the scope of the claimed subject matter.

The invention involves a composed impact member that comprises a plurality of impact block members which stretch, positioned next to each other, around in front of the drum wall, such that a closed inner space or a number of closed inner spaces are created stretching around between the impact block member and the drum wall, such that the closed inner space fills with particle material when an impact block member starts to wear through, which particle material is continuously compacted by repetitive impact creating an impact face that is partly autogenous of compacted own material, which autogenous areas provide still significant impact intensity, provides temporary protection to the construction behind the impact member, provides a warning sign that the impact block member can be exchanged in time before the construction behind the impact block member becomes damaged:

The principal aim of the invention is achieved with the aid of a support member, firmly attached to the impact block, stretching along a standing side, such that an essentially closed inner space is created between the composed impact member and the drum wall, fills with particle material when the impact block starts to wear through, creating a partly worn through impact face that is partly autogenous of own material, compacted by repetitive impact, providing still significant impact intensity and temporary protection to the construction behind the impact block; - such that collapse of the upper part and/or of the lower part of the impact member block into the crushing chamber is hindered when an impact member wears through and splits; with the result that a maximum amount of wear material is effectively utilized during service and possible damage to the crushers is averted, and longer service time is attained, saving on wear costs and increasing machine availability.

Another aim of the invention is achieved by providing the support member with simple attachment means providing an essentially dove tail like attachment arrangement, locking the impact block member from moving forward and/or in vertical direction downward, removable for exchange.

Another aim of the invention is achieved by providing the crusher housing with supporter elements, removable for exchange, attached to the drum wall construction, preferably removable for exchange in case of damage, stretching underneath the impact block member along the radial plane into the direction of axis of rotation, for easy instalment of the impact block members.

Another aim is achieved with a cage member that carries the impact block members, comprising an annular ring construction stretching along at least part of the top sides of the impact block members to which the impact block members are attached, essentially underneath the annular attachment ring, removable for exchange, creating an annular composed impact member, liftable into and out of the drum member.

The invention is further described in the description and the claims, to which reference is made.

BRIEF DESCRIPTION OF THE DRAWINGS For better understanding, the aims, characteristics and advantages of the device of the invention, are explained in the following detailed description of the device of the invention in relation to accompanying diagrammatic drawings.

Figure 1, shows, diagrammatically, a side view A- A of a first embodiment of the crusher housing according the invention, provided with a first embodiment of a impact block member according the invention;

Figure 2, shows, diagrammatically, a top view of the crusher housing without lid from figure 1 ;

Figure 3, shows, a first 3D view of the impact block member from figure 1 ;

Figure 4, shows, a second 3D view of the impact block member from figure 1 ;

Figure 5 shows, a top view of the impact block member from figure 1 ; Figure 6, shows, diagrammatically, the 3D view of the instalment arrangement for the impact block member of figure 1 ;

Figure 7, shows, diagrammatically, a 3D view of another instalment arrangement with a the impact block member of figure 1 ;

Figure 8, shows, diagrammatically, a 3D view of a wear pattern of the impact member of figure 1 ;

Figure 9, show, diagrammatically, a side view of the impact block member according the invention of figure 1 ;

Figure 10, show, diagrammatically, a side view the impact block member according the invention of figure 1 , with wear pattern;

Figure 11, shows, diagrammatically, a 3D view of a second embodiment of the impact block member according the invention;

Figure 12, shows, diagrammatically, a 3D view of a third embodiment of the impact block member according the invention;

Figure 13, shows, diagrammatically, a side view of a fourth embodiment of the impact block member according the invention;

Figure 14, shows, diagrammatically, a top view of the impact block member of figure

13;

Figure 15, shows, diagrammatically, a 3D view of a fifth embodiment of the impact block member according the invention;

Figure 16, shows, diagrammatically, a side view of the impact block member from figure 15;

Figure 17, shows, diagrammatically, a 3D view of a sixth embodiment the impact block member according the invention;

Figure 18, shows, diagrammatically, a top view of the impact block member from figure 17;

Figure 19, shows, diagrammatically, a 3D view of a seventh embodiment impact block member according the invention;

Figure 20, shows, diagrammatically, a side view the impact block member of figure 19;

Figure 21, shows, diagrammatically, a side view the impact block member of figure 19, indicating a wear pattern;

Figure 22, shows, diagrammatically, a 3D view of a first instalment arrangement for impact block member of figure 19;

Figure 23, shows, diagrammatically, a to view of a segment of the crusher housing provided with the impact block member of figure 19; Figure 24, shows, diagrammatically, a to top view of the crusher housing provided with the impact block member of figure 19;

Figure 25, shows, diagrammatically, a first 3D view of a ninth embodiment of the impact block member according the invention;

Figure 26, shows, diagrammatically, a second 3D view the impact block member of figure 25;

Figure 27, shows, diagrammatically, a 3D view of a first embodiment of a cage member, provided with a third instalment arrangement according the invention, for impact block member of figure 25;

Figure 28, shows, diagrammatically, a to top view of the crusher housing provided with the impact block member of figure 25;

Figure 29, shows, diagrammatically, a side view of a second embodiment of a cage member according the invention provided with the impact block member of figure 19;

Figure 30, shows, diagrammatically, a 3D view of a segment of the cage member of figure 29, provided with a fourth instalment arrangement according the invention;

Figure 31, shows, diagrammatically, a top view of the crusher housing provided with the cage member of figure 29;

Figure 32, shows, diagrammatically, a to 3D view of a tenth embodiment of the impact block member according the invention;

Figure 33, shows, diagrammatically, a top view of a third cage member according the invention for the impact block member of figure 32;

Figure 34, shows, diagrammatically, a first 3D view the cage member of figure 33 provided with a fourth instalment arrangement according the invention;

Figure 35, shows, diagrammatically, a second 3D view the cage member of figure 33; Figure 36, shows, diagrammatically, a to top view of the crusher housing provided with the cage member of figure 33, and the impact block members of figure 32;

Figure 37 show, diagrammatically, a 3D view of an eight embodiment of a stator impact block member, with a second instalment arrangement, according the invention;

Figure 38 show, diagrammatically, a side view of the stator impact block member, of figure 37.

Figure 39 show, diagrammatically, a top view of the stator impact block member, of figure 37.

BEST WAY OF IMPLEMENTING THE DEVICE OF THE INVENTION

A detailed reference to the preferred embodiments of the invention is given Examples thereof are shown in the appended drawings. Although the invention will be described together with the preferred embodiments, it must be clear that the embodiments described are not intended to restrict the invention to those specific embodiments. On the contrary, the intention of the invention is to comprise alternatives, modifications and equivalents, which fit within the nature and scope of the invention as defined by appended claims.

Figure 1 and 2, show, diagrammatically, a first embodiment (1) of a crusher housing construction (2) according the invention, provided with a first embodiment (3) of a impact block member (4), further detailed in figure 3 4, and 5, with the wear pattern that develops detailed, diagrammatically, in figures 8, 9 and 10.

The crusher housing construction (2), comprises a drum member (5) with a drum wall construction (6) that stretches in an essentially vertical direction, and is on top provided with a removable lid member (8), creating a crushing chamber (9) underneath the lid member (8) that is provided with a central opening (7) for feeding material into the crushing chamber (9). The crusher housing (2) is provided with a rotor (10), carried by the crusher housing construction (2) with the aid of a shaft member (11), positioned centrally in the crushing chamber (9), at a location underneath the central opening (7), which rotor (10) is rotatable about an essentially vertically directed axis of rotation (0) in at least one direction (00). The rotor (10) is provided with acceleration members (13), which are of at least one part carried on top of the rotor (10), for accelerating of the material that is fed into the crushing chamber (9) onto the rotor (10), with the aid of centrifugal force, which accelerated stream of particle material (12) is then thrown around from the rotor (10) at high velocity.

The crushing housing (2) is provided with a plurality of impact members (4), of at least one type of wear resistant construction material, creating a composed impact member (18), here a stator, of impact block members (4) positioned next to each other carried along the drum wall (6), surrounding the rotor (10) a radial distance away. The impact block members (4) can be attached to the drum wall (6) directly or carried with the aid of a cage member (not shown here) - the standing wall of which cage stretches along the drum wall functioning as drum wall (6) to be discussed later. Positioned next to each other along the drum wall construction (6), the impact block members (4) hinder each other to move in a forward direction.

The impact block member (4), detailed in figures 3,4 and 5, is provided with at least an impact block (47) and at least one support member (25), here two support members (25)(26), the impact block (47) provided with at least one impact face (14), transversally directed to the thrown stream of particle material (12), stretching in regular way around the axis of rotation (0), creating an essentially rounded composed impact face (15), a radial distance away from the rotor, stretching in vertical direction between the top side (19) and the bottom side (20), and in horizontal direction interrupted by the radial sides (17) of the impact block member that stretch into the direction of the drum wall (6) towards a back side (21) opposite of the impact face (14) facing the drum wall (6). The accelerated stream of particle material (12) is thrown at high velocity to collide with the impact face (14) for the particles to be crushed, the impact face (14) wearing out gradually around during operation developing an essentially concave wear pattern (22) along the centre (46) of the impact face (15) stretching between the top side (19) and the bottom side (20), which impact block (47) has to be replaced before the back side (21) wears through (23) and the construction (24) behind the impact block (47) becomes damaged.

The two support members (25) are here fixedly connected to the impact block (47), detailed in figure 3, 4 and 5, protruding from the back side (21) into the direction of the drum wall construction (6), stretching in an essentially vertical direction along part of the side edges (17) back side (21), at least crossing the centre part (48) of the back side (21) that wears through completely (23), such that an essentially closed inner space (27) is created stretching between the composed impact member (18) and the drum wall construction (6), along at least part of the backside (21) of the impact block (47), into the direction of the drum wall construction (6), such that the closed inner space (27) fills with particle material when the impact block (47) starts to wear through (23), such that the upper part (39) and the lower part (36) of the impact block (47) remain firmly connected to each other when the backside (21) wears through completely (23).

The impact block member is here carried by the drum wall construction (6) with the aid of the two standing bar members, detailed in figure 5, 6 and 7, provided with first attachment means (30)(31) along the top edges (28)(29), here two opposite first top attachment means (30)(31), fixedly attached, at a location outside the area, or centre part (48), where the back side (21) wears through, avoiding damage, fitting two second attachment means (32)(33), carried by the drum wall construction, here two lock members (32)(33) of an attachment strip (34), detailed in figure 6, stretching along the drum wall (6) at an attachment location (35), such that the impact block member can be firmly but removable attached to the drum wall, by sliding the impact block member (4) in downwards direction (51), detailed in figures 5 and 6, for which the top attachment members (30)(31) and the top lock members (32)(33) each are provided with an angled face (37)(38) that stretches into the direction of the drum wall (6), creating an essentially dove tail like attachment arrangement (55), detailed in figure 7, stretching both in the direction of the drum wall (6) and in vertical direction, such that movement of the impact block member (4) in downward and forward direction is hindered, such that that collapse into the crushing chamber (9) of the upper part (39) of the impact block (47) and/or of the lower part (36) of the impact block (47) is hindered when an impact block (47) wears through completely (23) between the standing bars (25)(26), because the lower part (36) of the impact block (47) remains connected to the upper part (39) with the standing bars (25)(26).

Figure 8, 9 and 10 show, diagrammatically, the wear pattern (43) as it develops along the centre part (48) of impact face (14). When the impact block member (4) starts to wear through (23), creating a partly worn through impact face (49), detailed in figure 10, when the closed inner space starts (27) starts to fill with own material, creating a partly worn through impact face (49) that is partly autogenous of own material, compacted by repetitive impact, providing still significant impact intensity, temporary protection to the construction (6) behind the impact block (47), a warning sign that the impact block member (4) has to be exchanged; it is important that the standing bar members (26) stretch at least along the centre part (48) of the back side (21) that wears through, such that the upper part (39) and the lower part (36) of the impact block (47) remain firmly connected to each other with the aid of the support members (25) when the backside (21) wears through completely (23), detailed in figure 8, and split and consequent collapse into the crushing chamber (9) of the upper part (39) of the impact block (47) and/or of the lower part (36) of the impact block (47) is hindered when the impact block (47) wears through completely (23) along the centre (46), avoiding damage to the crusher housing (2), with the result that the impact block members can be used until completely worn through along the centre part (48) of the back side (21), with the result that a maximum amount of wear material of the impact block (47) can be effectively utilized and longer service time is attained with the impact member (4), whilst damage to the crushing housing construction (2) is avoided.

Other instalment arrangements will be discussed later, but the invention allows for the impact block members (4) not to be carried by the drum wall construction (6), for example by the lid member (8) (not shown here). More instalment arrangements will be shown for illustration later, but the invention allows for other possible instalment arrangements, as well as attachment arrangements, of the impact block members (4) that can be imagined. Attachment arrangements includes, next to dove tail like solutions ((37)(38) of the first embodiment (3) of the sliding block member (4), such means as hooks, pins and bolts, and the like - that hinder collapse into the crushing chamber (9) of the upper part (39) of the impact block member (4) and/or of the lower part (36) of the impact block member (4), when an impact block member (4) wears through completely (23) between the top side (19) and the bottom side (20).

The invention allows for the impact block member (4) at least along the impact face (14) to be provided with at least one open chamber (not shown here) that fills with crushed material providing a partially autogenous impact face during service; and the invention allows also to obtain a partly autogenous impact face by positioning the impact block member a distance away from each other (not shown here).

The inner depth (40) - or width between the back side and the drum wall construction (6) and the drum wall construction (6) - of the closed inner space (27) must be sufficient to be effective depends on various parameters, in particular the type and properties of the feed material - such as crushing behaviour, feed diameter, resulting particle size distribution during repetitive impact, packing properties and moisture content - and the impact velocity and impact sequence. Furthermore, it is important that the vertical width (44) of the wear through opening (23) does not become too big; as a rule of the thumb, the vertical width (44) should not exceed the inner depth (40) of the closed inner space (27). To avoid damage to the drum wall construction (6) behind the impact block member (4), the closed inner space (27) has to provide sufficient impact resistance/protection, decided by the inner depth (40) of the closed inner space (27), and of course the size of the worn through part (23), and the impact block member (4) has to be exchanged before this becomes too large, which requires regular inspection when the accelerating members (13) are exchanged. Typically, effective inner depth (40) is minimum 50 mm with crushing of 80 mm gravel feed material at some 75 m/s impact velocity, but depending on the parameters indicated before, inner depth (40) of 30 mm might be effective with finer feed material, or a larger inner depth (40) might be required, to be decided on trials that simulate the practical conditions.

As is shown in figure 7, the inner depth (40) of the closed inner space (27), or the distance between the back face of the impact block member and the drum wall construction, can be increased by positioning a wall strip member (52) between the standing bar member (26) and the drum wall construction (6); and the drum wall construction (6) can along the bottom edge (42) of the back side (21) be provided with a strip member (41) that stretches around along the drum wall (6), which strip member (41) stretches here underneath the support members (25) providing additional support to the impact block member (4).

According the invention the impact block member (4) is constructed of a wear resistant material; that is of at least an iron based alloy; and the impact block member (4) can at least partly along the impact face (14) be provided with a inserts or otherwise incorporated materials that provide a high wear resistance that the other construction material (not shown here), which can include ceramic materials; or more specific: employ iron, carbon steel, or an alloy of iron or steel, as the base metal, and other metals may be used such as, for example, aluminum, stainless steel, copper, nickel, alloys of any of these, or the like; and employ alumina and/or zirconia as the ceramic material, other ceramic materials may also be used such as, for example, tungsten carbide, titanium carbide, zirconia-toughened alumina, partially stabilized zirconia ceramic, silicon carbide, silicon oxides, aluminum oxides with carbides, titanium oxide, brown fused alumina, combinations of any of these, or the like; ceramic materials are embedded in the base metal in the form of inserts formed of ceramic particles held together with an adhesive, while in other embodiments the ceramic materials may comprise loose particles or grains of ceramic material embedded in the base metal; and at least the partly; that is, positioned vertically above the open rotor, be constructed of a wear resistant synthetic material, or the like.

Figure 11 shows, diagrammatically, a second embodiment (54) of a stator impact block member (55), where, two support members (57)(58), here two laying bar members (57)(58), fixedly attached to the impact block member (55), stretching between the back side (56) and the drum wall, at a location outside the area where the back side (56) wears through completely (23), avoiding damage when the back side (21) wears through, here, an upper laying bar member (57) along the top face (60) and a bottom laying bar member (58) along the bottom face (62), creating a circumferential closed inner space (63) between the laying bar members (57)(58) stretching in continuous way along the drum wall construction (6). The laying bar members (57)(58) are provided with first attachment means (30)(31) fitting second attachment means (32)(33) carried by the drum wall construction (6), in a way essentially similar to the first embodiment of the sliding block (4) from figure 3, creating also here an essentially dove tail like attachment arrangement (45)(66)(67), such that movement of the impact block member (55) in downward and forward direction is hindered, such that the impact block member (55) is firmly but removable attached to the drum wall, such that such that collapse into the crushing chamber (not shown here) of the upper part (68) of the impact block member (55) is hindered by the upper laying bar member (57), and of the lower part (69) of the impact block member (55) by the bottom laying bar member (61). when an impact block member (55) wears through completely (28) between the laying bar members (57)(58).

Figure 12 shows, diagrammatically, a third embodiment (70) of a stator impact block member (71), essentially similar to the second embodiment (54) of the impact block member (55), where the middle part of the laying bar members (57)(58) of the second embodiment (54) is removed, leaving two upper stub members (72)(73) and two bottom stub members (74)(75), such that a closed inner space (not shown here) can be created between the stub members (72)(73)(74)(75), which are each provided with an angled face attachment member (76)(77) and (78)(79) that fit the lock members (not shown here) that is carried by the drum wall ( not shown here), creating essentially dove tail like attachment arrangements (76)(77) and (78)(79), stretching both in the direction of the drum wall (not shown here) and in vertical direction, such that movement of the impact block member (71) in downward and forward direction is hindered, such that the impact block member (71) is firmly but removable attached to the drum wall, in a way essentially similar to the second embodiment (54).

Figures 13 and 14 show, diagrammatically, a fourth embodiment (80) of a stator impact block member (81), where the impact block member (81) is provided with a back plate member (82) that is fixedly attached a distance away to the back side (83) along the upper edge (84) and the bottom edge (85) of the back side (86) of the impact block (87) such that a closed inner space (88) is created between the back side (86) and the back plate member (82) inside the impact block member (81) that stretches around in essentially continuous circumferential way through the composed impact member (not shown here), which configuration hinders collapse when the impact block (87) wears through completely (89), because the back plate (82) holds the impact block (87) connected.

Figures 15 and 16 show, diagrammatically, a fifth embodiment (90) of a stator impact block member (91), where the support member (92) comprises at least two stub members (93)(94), at least one top stub member (93) that protrudes from the back side (95) into the direction of the drum wall construction (96) at a location near the top edge (97) of the back side (95), and at least one bottom stub member (94) that protrudes from the bottom side (98) in a downward direction at a location near the lower edge (99) of the back side (95), the top stub member (93) provided with a first top attachment means (100), the second top attachment means (101) comprising a strip member (102), carried by the drum wall construction (96), such that the first top attachment means (100) fits a second top attachment means (101), providing an essentially dove tail like back attachment assembly (103) locking the impact block member (91), the second bottom attachment means (101) presenting two lock openings (104)(105) that fit the bottom stub members (94)(95);

Figures 17 and 18 show, diagrammatically, a sixth embodiment (105) of a stator impact block member (106), where, the impact face (107) of the impact block member (105) presents a relief (108), stretching around along the drum wall construction (not shown her), creating a composed impact face with essentially knurled configuration.

The invention allows for other types of relief (109), that can be applied at shorter radial distance from the rotor to achieve a larger, more effective, angel of impact; and relief can also be applied at greater radial distance from the rotor to limit the velocity at which the particles move in the crushing house along the composed impact face, reducing the wear rate, however, possibly at certain expense of the impact intensity that is generated.

Figures 19, 20, 21, 22, 23 and 24 show, diagrammatically, a seventh embodiment (109) of a stator impact block member (110), with a first instalment arrangement (111), according the invention, which is the preferred configuration, where the impact block members (110), detailed in figures 19, of the composed impact member (115) are positioned next to each other, stretching along the drum wall construction (112), each impact block member (110) carried on top (113) of at least two supporter elements (114), requiring no further attachment, because the impact block members (110) of the composed impact member (1 15) hinder each other to move in forward direction (116), towards the axis of rotation (not shown here)), and the support members (118) hinder the upper (119) and lower part (120) of the impact block (121) to break loose when the backside (122) of the impact block (121) wears trough completely (122), which provides a very simple instalment arrangement (111), detailed in figure 22. The impact block members (110) have only to be lifted with the aid of the lifting device (124), to be installed on top (113) of the supporter elements (114). The supporter elements (114) are here removable attached (not shown) to the drum wall construction (112), stretching along the bottom side (129) of the impact block member (110), along the radial plane (123) into the direction of axis of rotation (not shown here); preferably closer (125) to the axis of rotation (not shown here)) than (126) the point of gravity (127) of the impact block member (110), avoiding that the impact block members (110) move forward during instalment of the composed impact member (1 15), detailed in figure 23, and, also because wear develops along the inner side (128) of the bottom side (129), detailed in figure 20 and 21, possibly causing damage to the supporter elements (114); and the invention allows for different types of supporter elements (114), for example, bar members, rod members or plate members (only the latter shown here ).

Figure 37, 38 and 39 show, diagrammatically, an eight embodiment (201) of a stator impact block member (202), with a second instalment arrangement (203), according the invention, which is also a preferred configuration, where, the support member (204) comprises here one standing notch member (205) and a standing notch chamber (209), the standing notch member (209), fixedly connected to the impact block (206), stretching in essentially vertical direction along a first associated standing radial side (207), the second associated standing side (208) provided with a notch chamber (209) that fits the standing notch member (205), such that the impact block members (202) can be installed next to each other, vertically dropped (210), creating a composed impact member (211), such that the upper part (212) and the lower part (213) of the impact block member (202) remain in place when the standing back side (214) of one impact blocks (206) wears through completely (215) between the standing radial sides (207)(208), the closed inner space stretching (216) in essentially continuous way around. The radial width (217) of the notch member (205), measured along the radial line (218) from the axis of rotation (not shown here), decreased in downward direction (210), the notch member (205) and the notch chamber (209) creating here a wedge like attachment arrangement (219); optionally a dove tail like attachment arrangement (not shown here); And the invention allows for other configurations of the notch member (not shown here), that hinder downward movement (210) of an impact block member (202) of the composed impact member (211).

The notch member (205) might hinder positioning of ceramic inserts (not shown here) close along the associated radial side (207), when ceramic inserts have to be positioned at somewhat larger distance from the associated radial side (207), creating weaker areas between the impact block members (202), along the standing radial sides (207)(208) where wear (220) can progress faster; but casting techniques are available to solve this problem.

The drum wall construction (221) is here provided with two wall members (222)(223) comprising two annular ring members (222)(223), stretching around along the drum wall construction (221), an upper annular ring (222) along the top edge (224) of the back side (214) and a lower annular ring (223) along the bottom edge (225) of the back side (214), such that the wall members (222)(223) do not become damaged when the impact block (206), or here impact block member (202) wears through completely (215) between the standing radial sides (222)(223) - creating the closed inner space (216) between the annular ring members (222)(223).

Figures 25, 26, 27 and 28, show, diagrammatically, an ninth embodiment (130) of a stator impact member (131), with a first embodiment of cage construction (133), according the invention, where, the impact block members (131) of the composed impact member (132) are carried with the aid of a cage construction (133), carried (134) by the drum wall construction (135), provided with a standing ring plate (136) and a reinforcement ring (137) stretching around a distance (138) away along the drum wall construction (135), to be liftable (134), the closed inner space (139) created between the impact block members (132) and the ring plate (136), and a supporter element (140), attached to the ring plate (136). The impact block member (131), detailed in figures 25 and 26, is here along the backside (142) provided with a single standing support member (143), stretching in vertical direction along the centre of the back side (142), along the top edge (144) provided with first attachment means (145), at a location (152) outside the area (153) where the back side wears through (154), avoiding damage when the back side () wears through completely (155). The cage construction (133), detailed in figure 27, is along the upper edge (146) provided with an attachment opening (147) in the supporter element (140) provided with second attachment means (148), fitting the first attachment means (145), creating an essentially dove tail like attachment arrangement (146)(147), in vertical direction, such that movement of the impact block member (131) in downward and forward direction is hindered, such that the impact block member (131) is firmly but removable attached to the drum wall construction (135), the cage construction (133) with the impact block members (131) liftable into and out of the drum member (148), the standing ring plate (136) of the cage construction (133) being regarded as part of the drum wall construction (135). The impact block members (131) are here provided with a straight impact face (149), creating a composed impact face (150) with a polygon configuration (151).

Figures 29, 30 and 31, show, diagrammatically, a second embodiment (156) of a cage construction (159) according the invention, here provided with the impact block member (110) of figure 19; where, the impact block members (157) of the composed impact member (158) are carried, with the aid of a cage construction (159), carried by the drum wall construction (160), liftable attached (170), provided with a standing ring plate (161) and a reinforcement ring (164) stretching around an instalment distance (162) away along the drum wall (173). The impact block members are similar to the impact block members (110) of the configuration of figure 19 (lifting device not shown), to which reference is made, and the closed inner space (163) is here created between the impact block members (157) and the ring plate (161) The cage construction (159), detailed in figure 30, is provided with supporter elements (165), attached to the ring plate (161), on top (166) of the reinforcement ring (164) and are preferably removable attached (not shown here) for exchange in case of damage, stretching along the bottom side (167) the impact block member (157), along the radial plane (167) into the direction of axis of rotation (0), closer (168) to the axis of rotation (0) than (174) the point of gravity (169) of the impact block members (157), for example bar members (165) shown here, or rod members or plate members, or an annular ring, the impact block members (157) positioned in the cage construction (159) next to each other, on top of the supporter elements (165), removable for exchange, creating a composed caged impact member (171), liftable into and out of the drum member (172), the standing plate (161) of the cage construction (159) being regarded as part of the drum wall construction (160).

Figures 32, 33, 34, 35 and 36 show, diagrammatically, a tenth embodiment (175) of a stator impact member (176), with a third embodiment of the cage construction (178), where, the impact block members (176) of the composed impact member (177) are carried with the aid of an annular ring construction (178) stretching along at least part of the top sides (1 9) of the impact block members (176), provided with lock plates (181), fixedly attached, stretching from the outer edge (182) of the annular ring construction (178) into the direction of the drum wall construction (183), provided with lock edges (185) stretching into the direction of the drum wall construction (183) providing second attachment means (184), creating an annular attachment ring (186), carried by the drum wall construction (183); the impact block member (176) provides with lock strip members (181), providing first attachment means (200) stretching along part of the top side (179), creating an open lock chamber (187), open (188) along the top side (179), open (189) into the direction of the axis of rotation (0), the lock strip members (181) of the annular attachment ring fitting the lock edges (185) of the impact block members (176), such that the impact block member (176) can be moved radially inward (190) with the aid of a dove tail lifting chamber (195) for attachment to the annular attachment ring (186), essentially along the under side (191) of the annular attachment ring (186), removable for exchange, locked with the aid of a surrounding lock ring member (192) which is carried by the annular attachment ring (186), creating an annular composed impact member (193), liftable with the impact block members (176) into and out of the drum member (194); which annular impact ring has the advantage that it can be installed essentially fitting the drum member, and requires no space for the standing ring plate (161) and the instalment distance (162), which makes it possible to position the composed impact face (196) at greater radial distance (197) from the rotor (198), increasing the angle of impact (199), achieving higher impact intensity; and makes it also possible that the cage construction (178) can be carried by the drum member (5), but also by the lid member (8), and even be part of the lid member construction (8).

The above descriptions of specific embodiments of the present invention have been given with a view to illustrative and descriptive purposes. They are not intended to be an exhaustive list or to restrict the invention to the precise forms given, and having due regard for the above explanation, many modifications and variations of stator part members provided with closed inner space or spaces are, of course, possible. The embodiments of the impact members have been selected and described in order to describe the principles of the invention and the practical application possibilities thereof in the best possible way in order thus to enable others skilled in the art to make use in an optimum manner of the invention and the diverse embodiments with the various modifications suitable for the specific intended use; and the same applies for the stator impact members and anvil members with closed inner space according the invention.

The intention is that the scope of the invention is defined by the appended claims according to reading and interpretation in accordance with generally accepted legal principles, such as the principle of equivalents and the revision of components.