JP2005305362A - Wood crusher - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wood crusher capable of sharply reducing the time and labor required for a replacement operation of a screen member. <P>SOLUTION: This wood crusher is provided with a crushing unit 12 having a crushing rotor 61 which crushes wood to be crushed, screen support members 80, 98 disposed on the outer peripheral side of the crushing unit 12, first and second screens 69, 70 that are disposed so as to be able to be drawn and inserted in the axial line direction of the crushing rotor 61, and hydraulic cylinders 81, 101 which move the screen support members 80, 98 forwards and backwards with respect to the crushing rotor 61. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a wood crusher for crushing pruned branch materials / thinned wood, branch wood, waste wood, and the like, for example, a wood crusher that crushes wood to be crushed by rotating a crushing rotor.

  For example, pruned branches / thinned wood that is generated when pruning timber that has been cut in the forest, branch timber that is generated in the creation and maintenance of green spaces, or waste wood that is used in wooden houses is usually the final Are treated as industrial waste. The wood crusher transports these branch materials, branch wood, etc. for the purpose of reducing the volume of waste in the waste treatment process or fermenting the crushed pulverized material and reusing it as organic fertilizer. Before starting, it is crushed to a predetermined size at the work site.

  As this type of wood crusher, a crushing rotor having crushing bits disposed on the outer peripheral portion, a sieve member provided on the outer peripheral side of the crushing device, and a sieve member holding means for holding the sieve member on the outer peripheral side of the crushing device (Support member) and a moving mechanism that moves the sieving member holding means to a position where the sieving member is replaced (for example, see Patent Document 1). In this wood crusher, the crushing wood is crushed with a crushing bit provided in the crushing rotor, and the crushed wood (wood chips) is crushed finely until the opening area of a plurality of openings provided in the sieve member is less than the opening area. Then, it is discharged outside through the opening. Since the particle size of the crushed wood is almost determined by the area of the opening of the sieve member, the particle size adjustment of the crushed wood should be prepared in advance with multiple types of sieve members with different areas of the opening and replace them appropriately Is done. The replacement of the sieving member is performed by moving the sieving member holding means to a position where the sieving member is replaced by a moving mechanism, and inserting and removing the sieving member at that position. This moving mechanism is provided on one end side of the suspension bolt and the sieve member holding means rotatably supported by the bracket, and is a support member that is screwed with the suspension bolt and supports the sieve member holding means at a predetermined position. When the suspension bolt is rotated, the screwed support member moves up and down according to the rotation. Thereby, the sieve member holding means rotates about the other end side as an axis, and the sieve member is moved to the replacement position.

JP 2002-346418 A

  In the above prior art, the sieve member holding means is moved by rotating the suspension bolt when the sieve member is replaced. The suspension bolt is rotated manually by a worker using a tool such as a wrench. Therefore, it takes time to replace the sieve member. Moreover, in the above prior art, the supporting member (shaft body) and the suspension bolts that support one end side of the sieve member holding means are provided in two locations in the crushing rotor axial direction, and the two suspension members provided in the separated locations are provided. Since it is necessary to move the sieving member holding means up and down while rotating the bolts substantially evenly, a great deal of labor is required particularly when the replacement work is performed alone.

  The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to provide a wood crusher that can greatly reduce the labor required to replace the sieve member.

  (1) In order to achieve the above object, a wood crusher of the present invention includes a crushing device having a crushing rotor for crushing wood to be crushed, a sieving member detachably provided on the outer peripheral side of the crushing device, Provided on the outer peripheral side of the sieving member, comprising a sieving member holding means for holding the sieving member on the outer peripheral side of the crushing device, and a first actuator for moving the sieving member holding means forward and backward with respect to the crushing device And

  In general, in a wood crusher that determines the particle size of crushed wood (wood chips) crushed by a crushing device using a sieve member, for example, multiple types of sieve members with different areas of openings are prepared in advance and replaced as appropriate. By doing so, the particle size of the crushed wood is adjusted.

  In the present invention, the sieve member holding means is moved back and forth with respect to the crushing device by the first actuator, whereby the sieve member is moved to a predetermined position and exchanged. As a result, the operator takes the replacement work as compared with the above-mentioned conventional technique in which the sieve member holding means is moved by manually rotating the suspension bolt using a tool such as a wrench to move the sieve member. Time and effort can be greatly reduced. Furthermore, for example, when the sieve member holding means is structured to be supported at a plurality of locations in the crushing rotor axial direction, the above-described conventional technique requires a plurality of suspension bolts to be rotated evenly, so that the replacement work is performed alone. However, according to the present invention, it is possible to operate the plurality of first actuators evenly by operating an operation switch or the like. Even when it is performed, the sieve member holding means can be moved up and down easily. Therefore, according to the present invention, the labor required for the replacement work of the sieve member can be greatly reduced.

  (2) In the above (1), preferably, first detection means for detecting the driving state of the first actuator is provided, and the first actuator causes the first actuator to move the sieve member holding means. It is assumed that the crushing rotor is controlled so that it cannot be driven when it is detected that the crushing device is retracted.

  Thereby, for example, when the sieving member is not held at a specified position when the crushing operation is performed, the crushing rotor cannot be driven and the crushing operation cannot be performed. As a result, it is possible to prevent the breakage of the equipment and the crushed wood that has not been passed through the sieve member because the sieve member has deviated from the specified position (that is, the particle size has not been adjusted) can be prevented from being discharged from the crushing device. Therefore, safety can be improved and deterioration of the quality of the crushed wood can be prevented.

  (3) In the above (1) or (2), it is preferable that a lock mechanism for restraining movement of the sieve member holding means by the first actuator is provided.

  (4) In the above (3), more preferably, the locking mechanism includes an engaging member that can be engaged with the sieve member holding means, and a second member that advances and retracts the engaging member with respect to the sieve member holding means. It shall consist of an actuator.

  (5) In the above (4), more preferably, a second detection means for detecting a driving state of the second actuator is provided, and the second detection means causes the second actuator to cause the engagement member to move. It is assumed that the first actuator is controlled so that it cannot be driven when it is detected that the screen has been moved to the sieve member holding means.

  Thereby, since the first actuator can be prevented from being driven when the sieve member holding means is restrained from being moved by the engaging member of the lock mechanism, damage to the device and the like can be prevented.

  According to the present invention, by using the actuator to advance and retract the sieve member holding means with respect to the crushing device, it is possible to greatly reduce the labor required for the exchange work of the sieve member.

Hereinafter, an embodiment of a wood crusher of the present invention will be described with reference to the drawings.
1 is a side view showing the entire structure of a self-propelled wood crusher as an embodiment of the wood crusher of the present invention, FIG. 2 is a top view of the self-propelled wood crusher shown in FIG. These are side views showing the detailed structure inside the side cover in the vicinity of the crushing device 12 described later. In the following, the directions corresponding to the left and right in FIG. 1 are the rear and front of the wood crusher, or one and the other.

  1 to 3, reference numeral 1 denotes a traveling body (traveling means) that enables self-running, 2 denotes a crushing function component that crushes the wood to be shredded provided on the traveling body 1, and 3 denotes this crushing. A discharge conveyor for conveying the crushed material crushed by the functional component 2 and discharging it outside the machine, 4 is a power unit (power unit) equipped with a power source (engine) of each mounted device, and is self-propelled in this example. The wood crusher is roughly constituted by the traveling body 1, the crushing function component 2, the discharge conveyor 3, the power unit 4, and the like.

  The traveling body 1 includes a track frame 5, drive wheels 6 and driven wheels 7 provided at both front and rear ends of the track frame 5, and a drive device (travel hydraulic motor) in which an output shaft is connected to the shaft of the drive wheel 6. 8 and a crawler belt (endless track crawler) 9 wound around the drive wheel 6 and the driven wheel 7. Reference numeral 36 denotes a main body frame provided on the track frame 5, and the main body frame 36 supports the crushing function component 2, the discharge conveyor 3, the power unit 4, and the like.

  The crushing function component 2 is introduced by a hopper 10 that receives the crushed wood to be input, a feed conveyor 11 as a means for conveying the crushed wood accommodated in the hopper 10, and the feed conveyor 11. A crushing device 12 (see FIG. 3) for crushing the wood to be crushed, and a press conveyor device 13 (see FIG. 3) for pressing the wood to be crushed introduced into the crushing device 12 before the crushing device 12 against the feed conveyor 11. I have.

  4 is a side view showing a detailed structure in the vicinity of the rear end of the hopper 10, FIG. 5 is a cross-sectional view taken along line VV in FIG. 4, and FIG. 6 is a front view of the hopper 10 viewed from the rear. In the figure, the same reference numerals are given to the same parts as those in the previous drawings, and the description will be omitted. However, in FIG. 4, the state which removed the outer wall body 15 mentioned later is shown in figure.

  4 to 6, the hopper 10 is formed in a bottomed shape, is provided substantially horizontally on the rear side of the crushing rotor 61 (described later) on the main body frame 36, and is provided on the rear side of the feed conveyor 11. A plurality of members are provided on the rear wall body 14, the outer wall bodies 15 on the left and right sides in the width direction, and on both sides in the width direction of the feed conveyor 11 inside the outer wall body 15, so that a gap is secured between the outer wall bodies 15. A side wall body 16 configured in an L-shape, and a widening portion (tilting portion) 17 provided in a shape of widening upward so as to span over the outer wall body 15 and the upper portion of the side wall body 16; A bottom wall body 18 provided on the entire bottom portion so as to slightly interpose a gap below the feed conveyor 11 and a front wall body 19 (see FIG. 3 described above) provided on the front side end portion are provided. The upper end of the rear wall 14 is set to the same level as or slightly higher than the transport surface of the feed conveyor 11, and the upper end of the front wall 19 is set to a level slightly lower than the transport surface of the feed conveyor 11. .

FIG. 7 is a cross-sectional view taken along the arrow VII-VII in FIG. 6 showing the detailed structure of the rear end portion of the feed conveyor 11. In this figure, the same parts as those in the previous drawings are given the same reference numerals for explanation. Omitted.
In the present embodiment, the rear wall body 14 of the hopper 10 is integrally formed by a rear wall portion 20 located at the rear end and a bottom wall portion 21 provided at a substantially right angle at the lower end portion of the rear wall portion 20. It is configured and has a substantially L-shape when viewed from the side. The bottom wall portion 21 extends substantially horizontally from the lower end of the rear wall portion 20 to a position below a driven wheel 41 (described later) of the feed conveyor 11, and is provided on substantially the same plane as the bottom wall body 18 with the beam 37 interposed therebetween. The bottom wall 18 and the bottom of the hopper 10 are configured. A pin 23 is provided on the upper end portion of the rear wall portion 20 via a bracket 22, and the rear wall portion 20 is attached to the side wall body 16 so as to be rotatable with the pin 23 as a fulcrum. As a result, the rear wall portion 20 and the bottom wall portion 21 are integrally rotated (that is, the rear wall body 14) is rotated, and the rear end portion of the hopper 10 can be opened and closed. A guide member 35 formed in an arc shape is provided on the bottom wall portion 21 so as to follow the trajectory of the rear end portion of the feed conveyor 11 with a slight gap, and the wood to be crushed is fed into the feed conveyor. 11 is suppressed from entering the space behind.

  Reference numerals 24 and 25 denote locking mechanisms for holding the rear wall body 14 in a closed state. The locking mechanism 24 is provided on the rear end surface of the beam 26 that is passed to the rear end portion of the bottom of the L-shaped side wall body 16. 25 are respectively provided on the upper surface of the bottom portion of the side wall body 16 at a position slightly ahead of the lock mechanism 24.

  8 (a) and 8 (b) are detailed views of the locking mechanism 24 as viewed from the same direction as FIG. 6. In these drawings, the same parts as those in the previous drawings are denoted by the same reference numerals. Description is omitted. Although detailed description is omitted, the configuration of the lock mechanism 25 is the same as that of the lock mechanism 24. Further, the lock mechanisms 24 and 25 are similarly provided on both sides of the self-propelled wood crusher in the vehicle body width direction (vertical direction in FIG. 2), and FIGS. 8 (a) and 8 (b) show the one side. It is illustrated.

  8A and 8B, the lock mechanism 24 includes a support plate 28 fixed to the beam 26 by a plurality of bolts 27, and two brackets provided on the support plate 28 at a predetermined interval. 29, a pin 30 inserted through the bracket 29, a handle 31 provided substantially perpendicular to the outer periphery of the pin 30, a locking member 32 for locking the handle 31, and a lower end portion of the rear wall body 14 And a bracket 33 fixed to.

  With this configuration, the pin 30 is inserted into the bracket 33 on the rear wall body 14 side and the handle 31 is locked between the bracket 29 and the locking member 32 as shown in FIG. The rear wall body 14 is fixed to the side wall body 16 via the pins 30 and the rear wall body 14 is held in a closed state. On the other hand, the pin 30 is rotated to a position where the handle 31 becomes substantially horizontal, the handle 31 is slid through the notch of the locking member 32, and the pin 30 is moved from the bracket 33 as shown in FIG. By removing, the restriction between the rear wall body 14 and the side wall body 16 is released. Furthermore, since another lock mechanism 25 is provided, the pin is pulled out from the bracket provided on the rear wall body 14 side in the same manner. In this example, since the lock mechanisms 24 and 25 are also provided on the other side in the width direction of the self-propelled wood crusher, the lock mechanisms 24 and 25 on the other side are similarly released. Thereby, the restraint of the rear wall body 14 is completely released, and the rear wall body 14 can be opened and closed.

  A state in which the rear wall 14 is opened is shown in FIG. 9 in association with FIG. As shown in FIG. 9, the pin 30 of the locking mechanism 24 is returned to the position shown in FIG. 8A again with the rear wall body 14 rotated relative to the side wall body 16 and the rear wall body 14 opened. The rear wall body 14 is held in an open state by being inserted into the opening 21a provided in the bottom wall portion 21 of the rear wall body 14 (that is, the lock mechanism 24 holds the rear wall body 14 in an open state). It is also a locking mechanism for). Thereby, workability | operativity and safety | security of an operator at the time of opening the rear wall body 14 and performing the cleaning operation | work in the hopper 10 can be improved now.

  Reference numeral 34 denotes a snap ring that prevents the pin 30 from falling off. The snap ring 34 is provided on the outer periphery of the pin 30 so as to be positioned between the brackets 29 and 29. In this example, when the lock of FIG. 8A is locked and the lock is released of FIG. The length is limited.

  The feed conveyor 11 includes a sprocket-like drive wheel 40 (see FIG. 3) provided on the crushing rotor 61 (described later) side, and a driven wheel provided on the opposite side (the rear side of the wood crusher, the rear wall body 14 side). 41 (see FIG. 7 and the like) and a drive wheel 40 and a driven wheel 41 provided at both ends in the conveying direction, and a plurality of rows (4 rows in this example, see FIG. 2) are arranged in the width direction. And a conveying body (conveying belt, chain belt) 42. Note that the conveyance body 42 is not shown in FIG. 3 and FIG. 10 and FIG.

  The driven wheel 41 is supported by a bearing 43 (see FIG. 4) provided on the outer wall surface of the rear portion of the side wall body 16 of the hopper 10, and the driving wheel 40 is positioned substantially on the same plane on the front side of the side wall body 16. It is supported by a bearing 46 (see FIG. 10 described later) provided on the outer wall surface of the side cover 45 of the crushing device 12 provided. As a result, the feed conveyor 11 extends from the lower part of the hopper 10, that is, from the inside of the side wall body 16 of the hopper 10 to the vicinity of the crushing rotor 61 (described later) and extends substantially horizontally, and the side covers of the hopper 10 and the crushing device 12. 45 is housed and arranged.

FIG. 10 is a side view of the vicinity of the crushing device 12, and FIG. 11 is a cross-sectional view showing the internal structure in detail. In these drawings, the same parts as those in the previous drawings are denoted by the same reference numerals and description thereof is omitted. .
10 and 11, 45 is the side cover of the crushing device 12 provided in front of the hopper 10, and 46 is a bearing of the feed conveyor 11 provided on the outer wall surface of the side cover 45. The rotation shaft of the drive wheel 40 of the feed conveyor 11 is connected to the output shaft of a drive device (feed conveyor hydraulic motor, not shown) provided outside the bearing 46 in the width direction via a coupling or the like. The feed conveyor 11 is configured to circulate and drive the transport body 42 between the drive wheels 40 and the driven wheels 41 by rotationally driving a driving device (not shown).

  47 is a guide member that is bent so as to be close to the rotation trajectory of the drive wheel 40, and is connected to the bottom wall body 18 and the front wall body 19 of the hopper 10, and 48 is slightly lower than the rotation trajectory of the drive wheel 40 and The scraper is disposed on the upper portion of the front wall body 19 so that the end facing the drive wheel 40 is as close as possible to the rotation locus of the drive wheel 40. The end portions in the width direction of the guide member 47 and the scraper 48 are fixed to the side cover 45 of the crushing device 12.

  The aforementioned press conveyor device 13 is provided so as to face the transport surface (upper surface) of the feed conveyor 11 that transports the wood to be shredded so as to be close to the rear side of the crushing rotor 61 (described later). The pressing conveyor device 13 has a rotating shaft 51 (see FIG. 3) supported by a crusher side cover 45 by a bearing 50 (see FIG. 11) so that it can rotate in a vertical plane (in the vertical direction). A support member 52 supported so as to be swingable and a presser roller 53 provided so as to be rotatable with respect to the support member 52 are provided.

  The support member 52 includes an arm portion 54 that includes a rotation shaft 51 and a bracket portion 55 that is provided on the distal end side of the arm portion 54 and supports the pressing roller 53. The lower end surface of the arm portion 54 is formed to be curved in an arc shape, and a curved plate 68 constituting a part of a crushing chamber 60 described later is attached to the curved portion. On the other hand, the attachment portion of the pressing roller 53 in the bracket portion 55 is formed in an arc shape having a smaller diameter than the pressing roller 53, and the outer peripheral surface of the pressing roller 53 protrudes from the bracket portion 55. The dimension of the pressing roller 53 in the width direction (the direction orthogonal to the paper surface in FIG. 3) is set to be equal to or larger than the width of the conveying surface of the feed conveyor 11.

  3 and 11, 56 and 57 are stoppers for restricting the rotation operation of the presser conveyor device 13. When the presser roller 53 is lowered to the position close to the drive wheel 40 of the feed conveyor 11, It arrange | positions inside the crusher side cover 45 so that the bracket part 55 and the curved board 68 may each contact | abut. Although not specifically shown, the presser roller 53 incorporates a drive device (presser roller hydraulic motor) in its body, and is rolled to the transport surface of the feed conveyor 11 by this drive device (not shown). The crushed wood on the feed conveyor 11 is rotated in the direction at substantially the same peripheral speed as the conveyance speed of the crushed wood, and is fed into the crushing device 12 in cooperation with the feed conveyor 11.

  The crushing device 12 described above is mounted on a substantially central portion in the longitudinal direction of the main body frame 36, and as shown in FIGS. 3 and 11, a crushing rotor 61 that rotates at high speed in the crushing chamber 60, and the crushing rotor 61 The first anvil 62 and the second anvil 63 are arranged so as to face each other in the rotation direction (forward rotation direction, clockwise direction in FIG. 3). Although details will be described later, the first and second anvils 62 and 63 are configured to be rotatable so as to be retracted in a direction following the normal rotation direction of the crushing rotor 61 when, for example, excessive impact is applied. (See FIG. 11 and the like).

  The crushing rotor 61 is rotatably supported by a bearing (not shown) provided on, for example, a side cover 45 of the crushing device 12 (or a support member (not shown) provided separately on the main body frame 36). The part is provided with a plurality of support members 64 and crushing bits (impact plates or crushing blades) 65 attached to the support members 64, respectively. The crushing bit 65 is disposed such that the blade surface thereof precedes the support member 64 when the crushing rotor 61 rotates in the forward rotation direction. Further, each crushing bit 65 is fixed to the support member 64 with a bolt 66 or the like, and can be easily replaced even when worn. In FIG. 10, reference numeral 67 denotes a driving device (hydraulic motor for crushing rotor) that rotationally drives the crushing rotor 61, and this driving device 67 is not particularly shown but is bolted to the side cover 45 of the crushing device 12. The output shaft is connected to the rotating shaft of the crushing rotor 61 via a V-belt or the like.

  The crushing chamber 60 described above is provided with respect to the crushing rotor 61, respectively, on the curved plate 68 provided on the upper side, and on the front side and the lower side, respectively, and opened with a diameter that sets the particle size of the crushed wood (wood chips). The first screen (sieving member) 69 and the second screen (sieving member) 70 having a large number of holes are substantially defined, and the rear side thereof is released as a crushed wood introducing portion. The curved plate 68 is attached to the curved portion of the arm portion 54 of the presser conveyor device 13 as described above, and is configured to move with the up and down swinging motion of the presser conveyor device 13. Similar to the curved plate 68, the first and second screens 69, 70 are arcuate so as to substantially follow the rotation trajectory of the crushing rotor 61 with a predetermined gap between the first and second screens 69, 70, respectively, with the crushing bit 65. It is formed and disposed so as to be detachable (replaceable) (details will be described later).

  FIGS. 12 and 13 are diagrams illustrating the details of the movable mechanism by extracting the configuration in the vicinity of the first anvil 62 and the first screen 69, and FIG. 14 is a sectional view taken along arrow XIV-XIV in FIG. In the figure, the same reference numerals are given to the same parts as those in the previous drawings, and the description will be omitted.

  12 to 14, reference numeral 71 denotes an arm to which the first anvil 62 is attached. The arm 71 is provided in a pair in the width direction (left and right direction in FIG. 14), and includes two rotating shafts 72 and 73 and a beam. 74. For example, one rotation shaft 72 is supported by a bearing 75 provided on the outer wall surface of the crusher side cover 45 (see FIG. 10), so that the rotation shaft 72 can be rotated as a fulcrum. It has become a structure. The directions of the rotation shafts 72 and 73 are substantially parallel to the rotation axis of the crushing rotor 61, respectively.

  The arm 71 is connected to a support member 76 whose front end is fixed to the crusher side cover 45 via a shear pin 77, so that the first anvil 62 is in a crushing operation (for example, in the state of FIG. 3). The curved plate 68 projects in the circumferential direction (the circumferential direction of the crushing rotor 61) on one side (the lower side in FIG. 12) and on the inner side of the curved plate 68 in the radial direction (the radial direction of the crushing rotor 61). It is fixed and held in such a posture. Therefore, when an impact load exceeding the allowable limit of the shear pin 77 is applied to the first anvil 62, the shear pin 77 is broken, the restraint of the arm 71 is released, and the arm 71 is retracted from the crushing chamber 60. And damage to each part is prevented.

  At this time, the rotation of the arm 71 is detected by a limit switch 126 (see FIG. 10) that engages with an engagement member 125 provided on the bearing 75, and the rotation of the arm 71 is detected by the limit switch 126. Then, a command signal for stopping the driving device 67 of the crushing rotor 61 is output by a controller (not shown).

  Reference numeral 78 denotes a stopper fixed to, for example, the crusher side cover 45 (or a support member (not shown) separately provided on the main body frame 36). The stopper 78 prevents interference between the arm 71 and other components. In order to prevent this, the rotation range of the arm 71 in the retracting direction of the first anvil 62 is limited.

  Reference numeral 80 denotes a frame-type screen support member (banana plate) that presses and holds the first screen 69 against the arm 71 from the outer peripheral side. The screen support member (sieving member holding means) 80 is arranged in the circumferential direction (of the crushing rotor 61). (Circumferential direction) One side (lower side in FIG. 12) end is connected to the arm 71 via the previous rotation shaft 73. Further, the other end in the circumferential direction of the screen support member 80 is connected to the previous beam 74 through a hydraulic cylinder (first actuator) 81. Both ends of the hydraulic cylinder 81 are rotatably connected to the screen support member 80 and the beam 74 via pins, respectively, and the screen support member 80 rotates relative to the arm 71 as the hydraulic cylinder 81 expands and contracts. It moves (moves forward and backward with respect to the crushing rotor 61). That is, the screen support member 80 is separated from the first screen 69 by contracting the hydraulic cylinder 81. As a result, the first screen 69 can be pulled out in the axial direction of the crushing rotor 61, and the first screen 69 can be easily replaced. At this time, the position of the screen support member 80 is detected by a limit switch (first detection means) 127 (see FIGS. 12 and 13; not shown in FIG. 14), and the limit switch 127 separates the screen support member 80. When a state (retracted from the crushing rotor 61, that is, the state shown in FIG. 13) is detected, a command signal that does not permit driving of the driving device 67 of the crushing rotor 61 is output by a controller (not shown), and a lock cylinder described later A command signal that does not permit the driving of 87 is also output. Accordingly, it is possible to prevent the crushing operation from being performed when the first screen 69 is not held by the screen support member 80 and the arm 71. As a result, each part is broken or the first screen is not held. It is possible to prevent a situation in which the crushed wood 69 that is out of the specified position and does not pass through the first screen 69 (that is, whose particle size is not adjusted) is discharged from the crushing device 12. Therefore, safety can be improved and deterioration of the quality of crushed wood can be prevented.

  The expansion / contraction operation of the hydraulic cylinder 81 is performed by a changeover switch 141 (described later) of an operation panel 138 (see FIG. 10) provided on the crusher side cover 45 (details will be described later). 10 and 11, reference numeral 82 denotes an opening for drawing out and inserting the first screen 69 provided on the crusher side cover 45 in consideration of the replacement work of the first screen 69, which is not particularly illustrated. For example, a bolt detachable cover or the like is attached to the opening 82.

  In FIG. 14, reference numeral 85 denotes a lock mechanism for the screen support member 80. The lock mechanism 85 has a bracket 86 in a fixed relationship with the arm 71, and a bottom side end portion fixed to the bracket 86 in the width direction (left and right in FIG. 14). Lock cylinder (second actuator) 87 provided in the direction), taper blocks 88 and 89 each having a taper portion fixed to and engaged with the rod side end of the lock cylinder 87 and the screen support member 80, and a lock And a guide member 90 that guides the slide operation of the taper block (engagement member) 88 accompanying the expansion and contraction operation of the cylinder 87.

  When the first screen 69 is sandwiched between the screen support member 80 and the arm 71, the taper block 88 in a fixed relationship with the arm 71 has a screen support member 80 from the outside in the radial direction (the radial direction of the crushing rotor 61). The taper block 89 is engaged with the taper block 89. That is, when the first screen 69 is held, the lock cylinder 87 is extended and the taper blocks 88 and 89 are engaged, so that the rotation of the screen support member 80 is restricted, and the first screen 69 is It is firmly fixed and held at a position (position shown in FIG. 3) where the crushing chamber 60 holding the crushing work is fixed. At this time, the restraint state of the screen support member 80 (that is, the expansion / contraction state of the lock cylinder 87) is detected by the limit switch (second detection means) 128. When a state in which the screen support member 80 is restrained by the limit switch 128 (a state in which the lock cylinder 87 is extended and the taper blocks 88 and 89 are engaged, that is, the state shown in FIG. 14) is detected, a controller (not shown). Thus, a command signal that does not permit the drive of the hydraulic cylinder 81 that rotates the screen support member 80 is output. Accordingly, the hydraulic cylinder 81 can be prevented from being driven when the screen support member 80 is in a state where its rotation operation is restrained by the lock mechanism 85, and damage to each part can be prevented. Therefore, when the screen support member 80 is rotated by the contraction of the hydraulic cylinder 81 and the first screen 69 is replaced as described above, the lock cylinder 87 is first contracted and the engagement of the taper blocks 88 and 89 is released. Do. The expansion / contraction operation of the lock cylinder 87 is performed by a changeover switch 140 (described later) of an operation panel 138 provided on the crusher side cover 45. FIG. 15 shows this unlocked state corresponding to FIG. In this embodiment, the lock mechanism 85 and the limit switch 128 are provided on both sides of the first screen 69 in the width direction (left and right direction in FIG. 14). However, if only one side is sufficient, either one is omitted. Also good.

  Returning to FIGS. 3, 10, and 11, 91 is a frame-type arm to which the second anvil 63 is attached. This arm 91 is, for example, the outer wall surface (or the main body frame 36) of the crusher side cover 45 (see FIG. 10). A rotation shaft (not shown) is supported by a bearing 92 provided on a support member (not shown) provided separately above, and is configured to be rotatable about the rotation shaft. The direction of the rotation axis is substantially parallel to the rotation axis of the crushing rotor 61.

  The arm 91 is connected to a support member 93 whose front end is fixed to the crusher side cover 45 via a shear pin 94, so that the second anvil 63 is in a crushing operation (for example, in the state of FIG. 3). The first screen 69 projects in the circumferential direction (the circumferential direction of the crushing rotor 61) on one side (the lower side in FIG. 3) and inward in the radial direction (the radial direction of the crushing rotor) from the inner wall surface of the first screen 69. Fixed and held in posture. Therefore, when an impact load exceeding the allowable limit of the shear pin 94 is applied to the second anvil 63, the shear pin 94 is broken, the restraint of the arm 91 is released, and the arm 91 is retracted from the crushing chamber 60. And damage to each part is prevented.

  At this time, the turning operation of the arm 91 is detected by a limit switch 130 (see FIG. 10) that engages with an engaging member 129 provided on the bearing 92, and the turning of the arm 91 is detected by the limit switch 130. Then, a command signal for stopping the driving device 67 of the crushing rotor 61 is output by a controller (not shown).

  A stopper 95 is fixed to, for example, the crusher side cover 45 (or a support member (not shown) provided separately on the main body frame 36). The stopper 95 interferes with the arm 91 and other components. In order to prevent this, the rotation range of the arm 91 in the retracting direction of the second anvil 63 is limited.

  FIG. 16A to FIG. 16C are diagrams showing the details of the movable mechanism extracted from the configuration around the second screen 70 described above. In this figure, the same parts as those in the previous drawings are the same. Reference numerals are assigned and description is omitted.

  In FIG. 16, reference numeral 97 denotes a press plate for the second screen 70, and the press plate 97 is formed so that the outer peripheral portion thereof substantially coincides with the curvature of the inner wall surface of the second screen 70. 16A), for example, the inner wall surface of the second screen 70 is in contact with the inner wall surface of the crusher side cover 45 (or a support member (not shown) provided separately on the main body frame 36). It is fixed with bolts etc. so as to contact. A frame-type screen support member (banana plate) 98 holds the second screen 70 by pressing it against the presser plate 97 from the outer peripheral side. The screen support member (sieving member holding means) 98 has a crushing machine side cover 45 (or a main body) provided on one end (left side in FIG. 16) of the circumferential direction (the circumferential direction of the crushing rotor 61). It is supported by a bearing 100 fixed to a support member (not shown) separately provided on the frame 36, and is configured to rotate in the vertical direction (advance and retract with respect to the crushing rotor 61).

  The other end in the circumferential direction of the screen support member 98 is attached to the outer wall surface of the crusher side cover 45 via a pair of hydraulic cylinders (first actuators) 101 and 101 at two locations on both ends in the crushing rotor axial direction. The support members 102 and 102 fixed with bolts or the like are connected to each other. Both ends of the hydraulic cylinder 101 are rotatably connected to the screen support member 98 and the support member 102 via pins, respectively, and the screen support member 98 moves the rotation shaft 99 along with the expansion / contraction operation of the hydraulic cylinder 101. Rotates to a fulcrum. Accordingly, the screen support member 98 is separated from the presser plate 97 by extending the hydraulic cylinder 101. As a result, the second screen 70 can be pulled out in the axial direction of the crushing rotor 61, and the second screen 70 can be easily replaced. At this time, the position of the screen support member 98 is detected by a limit switch (first detection means) 131 (see FIG. 10; not shown in FIG. 16). When a state of retreating from 61 and descending (that is, the state shown in FIG. 16C) is detected, a command signal that does not permit the driving of the driving device 67 of the crushing rotor 61 is output by a controller (not shown). A command signal that does not permit the drive of the lock cylinder 107 is also output. Thereby, it is possible to prevent the crushing operation from being performed when the second screen 70 is not held by the screen support member 98 and the presser plate 97. As a result, each part is damaged or the second screen 70 is not held. It is possible to prevent a situation in which the crushed wood that is out of the specified position and does not pass through the second screen 70 (that is, whose particle size is not adjusted) is discharged from the crushing device 12. Therefore, safety can be improved and deterioration of the quality of crushed wood can be prevented. The expansion / contraction operation of the hydraulic cylinder 101 is performed together with the expansion / contraction operation of the hydraulic cylinder 81 for rotating the screen support member 80 by the changeover switch 141 of the operation panel 138 provided on the crusher side cover 45 (details will be described later). ).

  10 and 11, reference numeral 103 denotes a notch (opening) for drawing out and inserting the second screen 70 provided on the crusher side cover 45 in consideration of the replacement work of the second screen 70. Although not shown, a bolt detachable cover or the like is attached to the notch 103, for example.

  Reference numeral 105 denotes a lock mechanism for the screen support member 98, which is provided in a pair at both ends of the screen support member 98 in the crushing rotor axial direction, like the hydraulic cylinder 101. The lock mechanism 105 includes a bracket 106 fixed to the outer wall surface of the crusher side cover 45, and a lock cylinder (second side) provided with a bottom side end fixed to the bracket 106 in the front-rear direction (left-right direction in FIG. 16). Actuator 107), taper blocks 108 and 109 having taper portions fixed to and engaged with the rod side end of the lock cylinder 107 and the screen support member 98, and bolts or the like on the outer wall surface of the crusher side cover 45, respectively. And a guide member 110 that guides the sliding operation of the taper block (engagement member) 108 accompanying the expansion and contraction operation of the lock cylinder 107.

  When the second screen 70 is sandwiched between the screen support member 98 and the pressing plate 97, the taper block 108 is provided on the screen support member 98 from the outside in the radial direction (the radial direction of the crushing rotor 61). Engage with. As a result, when the second screen 70 is held, the lock cylinder 107 is extended and the taper blocks 108 and 109 are engaged, so that the rotational movement of the screen support member 98 is restricted, and the second screen 70 is It is firmly fixed and held at a position (position shown in FIG. 16 (a)) where the crushing chamber 60 having crushing work is fixed. At this time, the restraint state of the screen support member 98 (that is, the expansion / contraction state of the lock cylinder 107) is detected by a limit switch (second detection means) 132 (see FIG. 10, not shown in FIG. 16). When a state in which the screen support member 98 is constrained (the state in which the lock cylinder 107 extends and the taper blocks 108 and 109 are engaged, that is, the state shown in FIG. 16A) is detected, the controller (not shown) A command signal that does not permit driving of the hydraulic cylinder 101 for rotating the support member 98 is output. Thereby, it is possible to prevent the hydraulic cylinder 101 from being driven when the screen support member 98 is restrained by the lock mechanism 105, and damage to each part can be prevented. Therefore, when replacing the second screen 70 by rotating the screen support member 98 by extending the hydraulic cylinder 101 as shown in FIG. 16C, first, the lock cylinder 107 is shortened as shown in FIG. Then, the engagement between the taper blocks 108 and 109 is released. The expansion / contraction operation of the lock cylinder 107 is performed together with the expansion / contraction operation of the lock cylinder 87 for restricting the rotation operation of the screen support member 80 by the changeover switch 140 of the operation panel 138 provided on the crusher side cover 45. . The state around the crushing device 12 at the time of unlocking is shown in FIG. The lock mechanism 105 and the limit switch 132 are preferably provided on both sides of the second screen 70 in the width direction (for example, the direction orthogonal to the inner surface of FIG. 16A). However, if only one side is sufficient, either one is omitted. May be.

FIG. 18 is a panel view of the operation panel 138 for the operator to operate the hydraulic cylinders 81 and 101 and the lock cylinders 87 and 107 described above.
As shown in FIG. 10 described above, the operation panel 138 is provided on the side cover 45 provided on the side of the crushing device 12. The operation panel 138 is provided with an emergency stop button 139 and two changeover switches 140 and 141 in order from the top as shown in FIG.

  As described above, the changeover switch 141 is a changeover switch for advancing and retracting the screen support members 80 and 98 that respectively hold the first and second screens 69 and 70 with respect to the crushing rotor 61. That is, when the first and second screens 69 and 70 are exchanged, the screen support member 80 is rotated by switching the changeover switch 141 to a separated position (a position turned counterclockwise in FIG. 18). The hydraulic cylinder 81 is contracted and the hydraulic cylinder 101 for rotating the screen support member 98 is extended, and the screen support members 80 and 98 are separated from the arm 71 and the holding plate 97, respectively. 70 can be exchanged together. After the replacement, the changeover switch 141 is switched to the approaching position (position rotated in the clockwise direction in FIG. 18), whereby the hydraulic cylinder 81 extends and the hydraulic cylinder 101 contracts, and the screen support members 80 and 98 are crushed. The first and second screens 69 and 70 are clamped by rotating so as to approach the rotor 61. When the changeover switch 141 is set to the neutral position (position shown in FIG. 18), both the expansion and contraction operations of the hydraulic cylinders 81 and 101 are stopped, and the rotation operations of the screen support members 80 and 98 are stopped. Yes.

  Further, the changeover switch 140 is a switch for operating the lock cylinders 87 and 107 as described above to switch between restriction and non-restriction of the rotation operation of the screen support members 80 and 98. That is, when the changeover switch 140 is switched to the unlocked position (the position rotated counterclockwise in FIG. 18), the lock cylinders 87 and 107 are shortened and the taper blocks 88 and 89 and the taper blocks 108 and 109 are engaged. Are solved respectively. Only by this, the screen support members 80 and 98 can be operated by the changeover switch 141. On the other hand, if the changeover switch 140 is switched to the lock position (the position rotated clockwise in FIG. 18) while the screen support members 80 and 98 both hold the first and second screens 79 and 80, the lock is achieved. The cylinders 87 and 107 are extended to engage the taper blocks 88 and 89 and the taper blocks 108 and 109, respectively. Thereby, both the screen support members 80 and 98 are restrained and fixed in a state where both the first and second screens 69 and 70 are sandwiched.

  Returning to FIGS. 1 and 2, the discharge conveyor 3 is suspended and supported at the discharge side (front side, right side in FIGS. 1 and 2) by a support member 112 that protrudes from the power unit 4. The opposite side (rear side, left side in FIGS. 1 and 2) is supported by being suspended from the main body frame 36 via a support member 113. Thereby, the discharge conveyor 3 passes below the power unit 4 from the lower side of the crushing device 12, and is disposed in an upward inclination outward from the front side of the self-propelled wood crusher. 114 is a frame of the discharge conveyor 3, and 115 is a conveyor belt (not shown) wound between driving wheels (not shown) and driven wheels (not shown) provided at both ends in the longitudinal direction of the frame 114. It is a conveyor cover provided on the top. Reference numeral 116 denotes a driving device (hydraulic motor for the discharge conveyor) that rotationally drives the driving wheels. By driving the driving device 116 to rotate, the conveyor belt is driven to circulate between the driving wheels and the driven wheels.

  The power unit 4 is mounted on the other end in the longitudinal direction of the main body frame 36 (the right side in FIGS. 1 and 2) via a support member 117. A driver's seat 118 is provided in a compartment on the rear side of the power unit 4 and on one side in the width direction (lower side in FIG. 2). Reference numeral 119 denotes an operation lever for driving operation provided in the driver's seat 118, and 120 denotes an operation panel for performing other operations, settings, monitoring, and the like. In this example, the operation panel 120 is provided on the side of the machine body so that an operator can easily operate from the ground, but may be provided on the driver's seat 118.

Next, operation | movement and an effect | action of the wood crusher which concern on this Embodiment of the said structure are demonstrated one by one.
For example, when wood to be crushed is introduced into the hopper 10 with an appropriate work tool such as a grapple of a hydraulic excavator, the wood to be crushed is guided by the expanding portion 17 of the hopper 10 and placed on the carrier 42 of the feed conveyor 11. Then, it is transported in a substantially horizontal direction toward the front side of the wood crusher by a transport body 42 that is circulated and driven while being guided by the side wall body 16 of the hopper 10.

  When the wood to be crushed on the feed conveyor 11 is conveyed to the vicinity of the press conveyor device 13, it enters the lower part of the press roller 53 of the press conveyor device 13 and pushes up the press conveyor device 13. Thereby, the wood to be crushed on the feed conveyor 11 is introduced into the crushing chamber 60 while being pressed and held between the feed conveyor 11 by the action of the weight of the press conveyor device 13. Thereby, at the time of crushing, the to-be-crushed wood protrudes into the crushing chamber 60 in a cantilevered manner with the portion sandwiched between the presser roller 54 and the feed conveyor 11 as a fulcrum, and this protruding portion of the crushing rotor 61 rotates. When the crushing bit 65 collides, the primary crushing is relatively roughly performed. The pieces of crushed wood that have been primarily crushed go around the space in the crushing chamber 60 on the outer periphery side of the crushing rotor 61 in the rotation direction of the crushing rotor 61, and sequentially collide with the first and second anvils 62 and 63. , The impact is further shattered.

  Of the pieces of wood that are being crushed as described above, those that are larger than the holes provided in the first and second screens 69 and 70 continue to circulate in the crushing chamber 60, By colliding with the first and second anvils 62 and 63 again, they are further crushed. Thus, when pulverized to a particle size that passes through the holes of the first and second screens 69, 70, crushed wood (wood chips) passes through the holes of the first or second screens 69, 70, It is discharged from the crushing device 12.

  The crushed wood (wood chips) discharged from the crushing device 12 falls onto the conveyor belt of the discharge conveyor 3 that is circulated and driven through a chute (not shown) and moves to the front side (right side in FIGS. 1 and 2). It is transported and discharged as a recycled product.

  In the present embodiment, the particle size of the recycled product (wood chip) is prepared by preparing in advance a plurality of types of first and second screens 69 and 70 having different opening areas, and replacing them appropriately. Adjusted. This screen replacement operation is performed as follows.

  First, the operator opens the door 133 (see FIG. 1) on the side surface of the crushing device 12. Next, the changeover switch 140 of the operation panel 138 provided on the side cover 45 is switched to the unlock position (position turned counterclockwise in FIG. 18), and the lock cylinders 87 and 107 are shortened. Subsequently, the changeover switch 141 is switched to the separated position (position rotated counterclockwise in FIG. 18), the hydraulic cylinder 81 is shortened and the hydraulic cylinder 101 is extended, and the screen support members 80 and 98 are respectively connected to the arm 71 and The presser plate 97 is separated. As a result, the first screen 69 can be replaced via the opening 82, and the second screen 70 can be replaced via the notch 103. Then, the operator manually pulls out the first and second screens 80 and 98 to the side of the crushing device 12 and inserts new first and second screens 80 and 98. In this way, when the replacement of the screen is completed, the screen support members 80 and 98 are returned to the original positions in the procedure opposite to the above, and the screen replacement operation is completed.

  According to the present embodiment performing the configuration and operation as described above, the following effects can be obtained. That is, in the above-described prior art, the operator rotates the suspension bolt manually using a tool such as a wrench and moves the screen support member to replace the screen. In this case, since the operator can move the screen support members 80 and 98 only by operating the changeover switch 141 of the operation panel 138, the labor required for the screen replacement work can be greatly reduced. Further, as in the present embodiment, there are a plurality of screen support members independently (two screen support members 80 and 98 in the present embodiment), and the screen support member 98 has a plurality of locations in the crushing rotor axial direction. In the case where the structure is supported at (two locations at both ends in the present embodiment), in the above-described conventional technology, the labor of the operator increases as the number of the suspension bolts increases, and the screen support member 98 is separated. Since it is necessary to rotate the two suspension bolts provided at the locations evenly, a great deal of labor is required particularly when there is only one worker. On the other hand, in the present embodiment, the operator can operate the plurality of hydraulic cylinders 81 and 101 substantially equally at the same time simply by operating the changeover switch 141. In addition, the screen support members 80 and 98 can be easily moved (turned). From the above, according to the present embodiment, it is possible to greatly reduce the labor required for the screen replacement work.

  In addition, although the presser conveyor apparatus 13 mentioned above was employ | adopted as a press introduction means of the to-be-crushed wood above, it is not restricted to this, For example, an endless member (a belt, a chain, etc.) between a drive roller and a driven roller You may use what wound. Further, the operation at the time of pressing may be configured to move up and down instead of rotating. In this case, the same effect is obtained.

  Moreover, although the wood crusher provided with what is called an impact crusher which attached the cutter (crushing bit 65) to the outer peripheral part of the crushing rotor 61 as an example was demonstrated as an example, it is not restricted to this, Other crushing apparatuses, for example, parallel A crushing device (such as a biaxial shearing machine including a so-called shredder) that has a cutter on a shaft arranged on the shaft and reversely rotates each other, and a roll-shaped rotating body (rotor) for crushing blades A rotary crushing apparatus (such as a six-axis crusher including a roll crusher) that rotates the pair in opposite directions and crushes the object to be crushed between the rotating bodies. Also, the present invention can be applied to a wood crusher equipped with a so-called wood chipper that makes the object to be crushed into chips. In these cases, the same effect as described above is obtained.

  Furthermore, although the case where the present invention is applied to a wood crusher capable of traveling on its own has been described as an example, the present invention is not limited thereto, and it can be lifted and transported by a mobile wood crusher that can be towed and run, for example, a crane. Needless to say, the present invention may be applied to a portable wood crusher, and further to a stationary wood crusher arranged as a fixed machine in a plant or the like.

It is a side view showing the whole structure of one embodiment of the wood crusher of the present invention. It is a top view showing the whole structure of one embodiment of the wood crusher of the present invention. It is a side view showing the detailed structure inside the side cover of the crushing device vicinity with which one Embodiment of the wood crusher of this invention was equipped. It is a side view showing the detailed structure of the rear end vicinity provided in one embodiment of the wood crusher of this invention. FIG. 5 is a cross-sectional view taken along line VV in FIG. 4 showing a detailed structure in the vicinity of a rear end of a hopper provided in an embodiment of the wood crusher of the present invention. It is the front view seen from the back of the hopper showing the detailed structure near the rear end of the hopper with which one embodiment of the wood crusher of the present invention was equipped. It is a VII-VII arrow sectional view in Drawing 6 showing the detailed structure of the rear end part of the feed conveyor with which one embodiment of the wood crusher of the present invention was equipped. It is detail drawing of the locking mechanism of the rear wall body of the hopper with which one Embodiment of the wood crusher of this invention was equipped. It is a figure showing the state by which the rear wall body of the hopper with which one Embodiment of the wood crusher of this invention was equipped was open | released. It is a side view of the crushing device vicinity with which one Embodiment of the wood crusher of this invention was equipped. It is sectional drawing showing in detail the internal structure of the crushing device vicinity with which one Embodiment of the wood crusher of this invention was equipped. It is a figure showing the detail of those movable mechanisms which extracted the structure of the 1st anvil and 1st screen vicinity with which one Embodiment of the wood crusher of this invention was equipped. It is a figure showing the detail of those movable mechanisms which extracted the structure of the 1st anvil and 1st screen vicinity with which one Embodiment of the wood crusher of this invention was equipped. It is the XIV-XIV arrow directional cross-sectional view in FIG. 12 which extracts the structure of the 1st anvil and 1st screen vicinity with which one Embodiment of this invention was equipped, and shows those movable mechanisms in detail. It is a figure showing the state at the time of lock release of the 1st screen with which one Embodiment of the wood crusher of this invention was equipped. It is a figure showing the detail of the movable mechanism which extracted the structure of the 2nd screen vicinity with which one Embodiment of the wood crusher of this invention was equipped. It is a figure showing the state of the crushing device periphery at the time of lock release of the 2nd screen with which one Embodiment of the wood crusher of this invention was equipped. It is a board surface view of the operation panel for operating the hydraulic cylinder which rotates the screen support member which comprises one Embodiment of the wood crusher of this invention, and a lock cylinder.

Explanation of symbols

1 Traveling body (traveling means)
3 Discharge conveyor 12 Crushing device 61 Crushing rotor 69 First screen (sieving member)
70 Second screen (sieving member)
80 Screen support member (screen member holding means)
81 Hydraulic cylinder (first actuator)
82 Opening 85 Locking mechanism 87 Lock cylinder (second actuator; hydraulic cylinder)
88 Taper block (engagement member)
98 Screen support member (screen member holding means)
101 Hydraulic cylinder (first actuator)
103 Notch (opening)
105 Lock mechanism 107 Lock cylinder (second actuator: hydraulic cylinder)
108 Taper block (engagement member)
127 Limit switch (first detection means)
128 limit switch (second detection means)
131 Limit switch (first detection means)
132 Limit switch (second detecting means)

Claims (5)

A crushing device having a crushing rotor for crushing the wood to be crushed;
A sieve member detachably provided on the outer peripheral side of the crushing device;
A sieve member holding means provided on the outer peripheral side of the sieve member, and holding the sieve member on the outer peripheral side of the crushing device;
A wood crusher comprising: a first actuator for moving the sieve member holding means forward and backward with respect to the crushing device.   When first detection means for detecting the driving state of the first actuator is provided, and the first detection means detects that the first actuator has retracted the sieve member holding means from the crushing device. The wood crusher according to claim 1, wherein the crushing rotor is controlled so that it cannot be driven.   The wood crusher according to claim 1 or 2, further comprising a lock mechanism that restrains movement of the sieve member holding means by the first actuator.   4. The lock mechanism includes an engagement member that can be engaged with the sieve member holding means, and a second actuator that moves the engagement member forward and backward relative to the sieve member holding means. Wood crusher.   Second detection means for detecting the driving state of the second actuator is provided, and the second detection means detects that the second actuator has advanced the engagement member to the sieve member holding means. In this case, the wood crusher according to claim 4, wherein the first actuator is controlled so as not to be driven.

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