JP2008132435A - Chip crushing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chip crushing apparatus which can be installed at a reduced space and stably crush chips. <P>SOLUTION: The chip crushing apparatus 1 is provided with: a base cover 2 directly attached to the lower part of the discharge part 61 of a chip conveyer 6; a rotary crushing drum 3 having a plurality of crushing blades 311 and rotatably supported inside the base cover 2; a rotation drive source 4 rotating the rotary crushing drum 3; and a perforated plate 5 set to the base cover 2 with a given space S below the rotary crushing drum 3. A rotary shaft 300 of the rotary crushing drum 3 is disposed in parallel with the rotary shaft 620 of the discharge side end part 621 of a conveying caterpillar 62 of the chip conveyer 6. The entire of the plurality of crushing blades 311 of the rotary crushing drum 3 has an axial width of 80% or more of an axial width of the discharge side end part 621 of the conveying caterpillar 62. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an apparatus for crushing long chips discharged from a discharge unit of a chip conveying conveyor attached to a cutting machine.

When cutting such as lathe machining of a shaft-shaped part, chips of various thicknesses and lengths are discharged according to cutting conditions, the shape of the cutting part, and the like. In particular, when cutting is performed smoothly, chips that are continuous in a long shape (usually spiral) are discharged. Such long chips are crushed finely using, for example, a crushing apparatus disclosed in Patent Document 1 in order to facilitate disposal.
In the crushing processing apparatus of Patent Document 1, the chips that are discharged from the discharge part of the machine tool or the like by the hopper are received, and the chips are arranged on the outside of the crushing rotor and a plurality of crushing blades in the crushing rotor. The material is finely crushed.

  However, in the conventional chip crushing apparatus such as Patent Document 1, in order to cope with a chip conveying conveyor of various sizes in a cutting machine (in order to have versatility), with respect to a chip crushing portion of the chip Thus, the upper end opening of the hopper, which is a chip receiving portion, is widely formed. And the flow of the chip | tip discharged | emitted from the discharge part of a chip conveyance conveyor is restrict | squeezed (converged) with the hopper, and it supplies to the crushing site | part of a chip | tip. Therefore, it was not enough to stably crush the chips.

  Moreover, the conventional chip crushing apparatus is installed on the floor surface of a factory using mounts, such as a mounting stand, and requires a large space for this installation. Thereby, there was a great restriction on the space for arranging a box (container box) for collecting finely crushed chips at the lower part of the chip crushing apparatus. Moreover, since the conventional chip crushing apparatus is installed in the floor using the mount frame, the distance from the discharge part in a chip conveyance conveyor to the crushing site | part of a chip will become long. Therefore, it was not enough to stably smash the chips into the crushing site.

JP-A-2005-296895

  The present invention has been made in view of such conventional problems, and is intended to provide a chip crushing device that can reduce the installation space and can stably crush the chips. is there.

The present invention is an apparatus for crushing long chips discharged from a discharge part of a chip conveying conveyor attached to a cutting machine,
The chip crushing device includes a base cover directly attached to a lower portion of the discharge portion of the chip conveying conveyor, a rotary crushing drum that includes a plurality of crushing blades and is rotatably supported in the base cover, and the rotary crushing A rotation drive source for rotating the drum, and a perforated plate provided in the base cover at a predetermined interval below the rotary crushing drum;
The base cover has a side wall that encloses the side of the rotary crushing drum, and has an opening in the vertical direction,
The chips received from the discharge unit are crushed by the plurality of crushing blades in the rotary crushing drum, and the crushed chips are configured to fall from a plurality of dropping holes in the perforated plate,
The rotation shaft of the rotary crushing drum is arranged in parallel with the rotation axis of the discharge side end of the transport caterpillar for transporting the chips in the chip transport conveyor,
The whole of the plurality of crushing blades in the rotary crushing drum is in a chip crushing device having an axial width of 80% or more of an axial width of a discharge side end portion of the transport caterpillar. (Claim 1).

The chip crushing apparatus of the present invention comprises the above-mentioned base cover, rotary crushing drum, rotation drive source and perforated plate, and is used by directly attaching the base cover to the lower part of the discharge part of the chip conveying conveyor. To do. Thereby, the chip crushing apparatus of this invention does not need to be installed in the floor surface in a factory using a stand etc., and can be installed in the state suspended in the discharge part of a chip conveyance conveyor. Therefore, the chip crushing device can be installed in the factory in a space efficient manner.
In addition, the chip crushing device is used by attaching the base cover directly to the lower part of the discharge part of the chip conveyor, so that there is enough space for the box to collect the crushed chips in the lower position. Can be secured.

In the chip crushing apparatus of the present invention, the chip is crushed as follows.
In other words, long chips (usually spiral chips) discharged from the discharge part of the chip conveyor are rotated and surrounded by the side wall of the base cover from the opening above the base cover. Supplied to the drum. At this time, the chip crushing device can receive the chips directly from the discharge part of the chip conveying conveyor to the rotary crushing drum surrounded by the side wall of the base cover without using a hopper or the like. Thereby, when receiving the chips, the flow of the chips is not reduced, and the chips can be stably supplied to the rotary crushing drum.

  Moreover, the rotating shaft of the rotary crushing drum is arranged in parallel with the rotating shaft of the discharge side end of the transfer caterpillar in the chip transfer conveyor, and the entire plurality of crushing blades in the rotary crushing drum are arranged on the discharge side of the transfer caterpillar. The axial width is 80% or more of the axial width of the end portion. Thereby, most of the chips supplied from the discharge side end of the transport caterpillar can be directly delivered to the crushing blade. For this reason, the chips can be stably wound between the rotary crushing drum and the side wall of the base cover by the plurality of crushing blades in the rotary crushing drum, and the chips can be stabilized by the plurality of crushing blades and the perforated plate. And can be crushed. Then, the crushed chips can be dropped from a plurality of dropping holes in the perforated plate and collected in a box or the like disposed below the chip crushing device.

Moreover, the chip crushing apparatus of this invention can shorten the distance between a conveyance caterpillar and a rotary crushing drum extremely by attaching the base cover directly to the lower part of the discharge part of a chip conveyance conveyor. As a result, the chips can be more stably wound between the rotary crushing drum and the side wall of the base cover, and the chips can be stably crushed by the plurality of crushing blades.
Therefore, according to the chip crushing apparatus of the present invention, the installation space can be reduced and the chip can be stably crushed.

A preferred embodiment of the present invention described above will be described.
In the present invention, when the overall axial width of the plurality of crushing blades in the rotary crushing drum is less than 80% of the axial width of the discharge side end of the transport caterpillar, the rotary crushing drum and the base cover There is a possibility that the chips cannot be stably wound between the side walls of the metal. On the other hand, if the overall axial width of the plurality of crushing blades in the rotary crushing drum is too large, the apparatus will increase, so that the shaft is 120% or less of the axial width of the discharge side end of the transport caterpillar. It can be a direction width.
Further, the overall axial width of the plurality of crushing blades in the rotary crushing drum can be substantially the same as the axial width of the discharge side end of the transport caterpillar.

Moreover, the said crushing blade can be formed by the some convex surface which protruded radially in the radial direction of the said rotary crushing drum (Claim 2).
In this case, it is possible to easily form a rotary crushing drum capable of stably taking in chips between the rotary crushing drum and the side wall of the base cover.

The rotary crushing drum is preferably configured by connecting a plurality of crushing blade constituent portions in the axial direction.
In this case, by changing the number of connected crushing blade constituent parts, a plurality of crushing drums in the rotary crushing drum can be adapted to the conveying caterpillar having various axial widths in accordance with the axial width of the conveying caterpillar. The overall axial width of the blade can be easily set.

In addition, it is preferable that the rotary crushing drum is formed by changing the formation state of the crushing blades in the adjacent crushing blade constituent portions.
In this case, the chips discharged from the discharge unit of the chip conveying conveyor can be more stably wound between the rotary crushing drum and the side wall of the base cover.

  Here, the formation state of a crushing blade means states, such as the number of crushing blades in a crushing blade structure part, a shape, a magnitude | size, a phase. And the different formation state of the crushing blade in adjacent crushing blade components can be formed by varying the number, shape, size, etc. of crushing blades in adjacent crushing blade components. Moreover, the different formation state of the crushing blades in adjacent crushing blade constituent parts can be formed by shifting the phase in the circumferential direction between the adjacent crushing blade constituent parts.

Further, the crushing blade in the crushing blade constituent part is formed by a plurality of convex surfaces radially projecting in the radial direction of the rotary crushing drum, and the rotary crushing drum is a circumference between adjacent crushing blade constituent parts. By shifting the phase in the direction, the plurality of crushing blades can be arranged and formed in a lattice shape.
In this case, it is possible to form a rotary crushing drum that can more stably entrain chips between the rotary crushing drum and the side wall of the base cover.

Further, the base cover can be configured by disposing a gap adjustment block capable of changing a gap between the rotary crushing drum and the side wall facing the outer periphery of the rotary crushing drum. ).
In this case, the gap between the gap adjustment block and the rotary crushing drum can be easily adjusted by adjusting the position of the gap adjustment block. Thereby, the clearance gap which can crush a chip stably can be easily formed between a clearance adjustment block and a rotary crushing drum.

Below, it explains with a drawing about the example concerning the chip crushing device of the present invention.
As shown in FIG. 1 and FIG. 2, the chip crushing device 1 of the present example is a long chip discharged from a discharge unit 61 of a chip conveying conveyor 6 attached to a cutting machine (usually spirally connected). Chip) K1 is crushed. The chip crushing apparatus 1 rotates the base cover 2 directly attached to the lower part of the discharge part 61 of the chip conveyance conveyor 6, the rotary crushing drum 3 supported rotatably in the base cover 2, and the rotary crushing drum 3. A rotary drive source 4 and a perforated plate 5 provided on the base cover 2 with a predetermined interval S below the rotary crushing drum 3 are provided. The rotary crushing drum 3 includes a plurality of crushing blades 311 in the circumferential direction C and the axial direction L.

  As shown in FIG. 1, the base cover 2 has a side wall 21 that surrounds the side of the rotary crushing drum 3, and has openings 201 and 202 in the vertical direction. And the chip crushing apparatus 1 crushes the chip K1 received from the discharge part 61 of the chip conveying conveyor 6 with the plurality of crushing blades 311 in the rotary crushing drum 3, and crushes the crushed chip K2 after the crushing. The light plate 5 is configured to be dropped from a plurality of drop holes 51.

  Further, the rotary shaft 300 of the rotary crushing drum 3 is arranged in parallel with the rotary shaft 620 of the discharge side end 621 of the transporting caterpillar 62 that transports the chips K1 in the chip transporting conveyor 6. As shown in FIG. 2, the whole of the plurality of crushing blades 311 in the rotary crushing drum 3 has an axial width L <b> 2 that is 80% or more of the axial width L <b> 1 of the discharge side end 621 of the transport caterpillar 62. . Further, the overall axial width L <b> 2 of the plurality of crushing blades 311 in the rotary crushing drum 3 of this example is slightly larger than the axial width L <b> 1 of the discharge side end 621 of the transport caterpillar 62.

Below, it demonstrates in full detail with FIGS. 1-6 about the chip crushing apparatus 1 of this example.
Here, FIG. 1 shows the chip crushing device 1 disposed in the discharge unit 61 of the chip conveying conveyor 6 as seen from the axial direction L of the rotary crushing drum 3, and FIG. 3 is a partially enlarged view thereof. Indicates. 2 shows the chip crushing device 1 disposed in the discharge unit 61 of the chip conveying conveyor 6 as seen from the side of the rotary crushing drum 3, and FIG. 4 shows a partially enlarged view thereof. . FIG. 5 shows a partially enlarged view of the chip crushing device 1 as viewed from above the rotary crushing drum 3.

As shown in FIG. 1 and FIG. 2, the chip crushing device 1 of this example is not of a type that is installed on the floor of a factory by a gantry or the like, but a discharge unit 61 of a chip conveying conveyor 6 attached to a cutting machine. It can be installed directly.
As shown in FIGS. 3 to 5, the base cover 2 includes a pair of first side walls 21 </ b> A facing the outer periphery of the rotary crushing drum 3 and a pair of bearing portions 22 that rotatably support the rotary crushing drum 3. And a second side wall 21B. As shown in FIG. 2, the rotational drive source 4 of this example is a motor 4, and the output shaft of the motor 4 is connected to the central shaft portion 30 of the rotary crushing drum 3 through a speed reducer, a coupling, and the like. .

Moreover, the upper end opening part 201 connected with the discharge part 61 of the chip conveyance conveyor 6 is formed in the upper part of the base cover 2, and the crushed chip K2 after crushing is dropped in the lower part of the base cover 2 For this purpose, a lower end opening 202 is formed.
As shown in FIGS. 1 and 2, the base cover 2 of this example has an attachment portion 211 for attaching the base cover 2 to the discharge portion 61 of the chip conveying conveyor 6 on the upper part of the pair of second side walls 21 </ b> B. is doing. In addition, the base cover 2 includes a gap adjustment block 24 that can change the gap between the rotary crushing drum 3 and the inner surface of the pair of first side walls 21 </ b> A facing the outer periphery of the rotary crushing drum 3.

As shown in FIGS. 3 and 5, a bracket 23 is formed on the outer side of the pair of first side walls 21 </ b> A to support the gap adjustment block 24 so as to be slidable in the horizontal direction. Further, in the gap adjusting block 24, a long hole 241 through which the pin 231 provided in the bracket 23 is inserted is arranged in a direction facing the rotary crushing drum (a direction perpendicular to the axial direction L of the rotary crushing drum 3). It is formed.
Then, the clearance between the clearance adjusting block 24 and the rotary crushing drum 3 is adjusted by sliding the clearance adjusting block 24 in a direction facing the rotary crushing drum 3 by the engagement between the pin 231 and the long hole 241. be able to. Thereby, the clearance gap which can crush the chip K1 stably between the clearance adjustment block 24 and the rotary crushing drum 3 can be formed easily.

  As shown in FIGS. 1 and 4, in the base cover 2, the chips K <b> 1 are guided to the rotary crushing drum 3 on the first side wall 21 </ b> A located on the front side in the conveying direction of the chips K <b> 1 of the chip conveying conveyor 6. A guide plate 25 is provided. Further, a baffle plate 26 is provided on the first side wall 21 </ b> A located on the side opposite to the front side in the conveying direction to prevent the chips K <b> 1 from returning back into the chip conveying conveyor 6.

  As shown in FIGS. 1 and 2, the rotary crushing drum 3 of this example is located below the discharge-side end 621 of the conveying caterpillar 62 in the chip conveying conveyor 6. As shown in FIGS. 3 to 5, the rotary crushing drum 3 includes a central shaft portion 30 connected to the output shaft of the motor 4 and a plurality of crushing blade configurations arranged in the axial direction L on the outer periphery of the central shaft portion 30. Part 31. A key groove 314 is formed in the center hole 313 of each crushing blade constituent portion 31, and each crushing blade constituent portion 31 is rotationally fixed to the central shaft portion 30 via a key 32.

  As shown in FIGS. 3 and 5, each crushing blade constituting portion 31 has a disk shape provided with the center hole 313, and a plurality of crushing blades 311 are formed on the outer periphery thereof. The crushing blade 311 of this example is formed by a plurality of convex surfaces that protrude radially in the radial direction of the crushing blade constituting portion 31. Each crushing blade constituting portion 31 is formed by repeating a convex crushing blade 311 and a concave portion 312 formed between the crushing blades 311 in the circumferential direction C.

  Further, as shown in FIGS. 4 and 5, the rotary crushing drum 3 is configured by connecting a plurality of crushing blade constituting portions 31 in the axial direction L. The rotary crushing drum 3 of this example is formed by shifting the phases in the circumferential direction C between adjacent crushing blade constituent portions 31. Specifically, the rotary crushing drum 3 of the present example has a plurality of crushing blades 311 arranged in a lattice pattern on the outer periphery of the rotary crushing drum 3 by shifting the phase in the circumferential direction C between adjacent crushing blade constituent portions 31. It is arranged and formed. In the adjacent crushing blade constituent portions 31, the concave portion 312 in the other crushing blade constituent portion 31 is disposed adjacent to the axial direction L of the crushing blade 311 in the one crushing blade constituent portion 31. 2 and 4, the outer periphery of the rotary crushing drum 3 is shown, and the outer peripheral surface of the crushing blade 311 in the crushing blade constituting portion 31 is shown by hatching.

  Further, the rotary crushing drum 3 is inclined with respect to the radial direction of the rotary crushing drum 3 as shown in FIG. 6 in addition to using the plurality of crushing blade constituting portions 31 formed with the crushing blades 311 having the convex surfaces. The inclined crushing blade constituting portion 31A provided with a plurality of inclined crushing blades 311 protruding in this manner can also be used. In this case, the rotary crushing drum 3 can be formed by mixing the crushing blade constituting portion 31 and the inclined crushing blade constituting portion 31A and connecting them in the axial direction L. In addition, the inclined crushing blade constituting portion 31A can be disposed, for example, at the site shown in FIG. 5, and in addition to this, replace with any one of the plurality of crushing blade constituting portions 31 arranged in the axial direction L, It can arrange | position to a location suitably.

  It should be noted that, by changing the number of connected crushing blade constituent portions 31, the transfer caterpillar 62 having various axial widths L <b> 1 can be adapted to the axial width L <b> 1 of the transfer caterpillar 62 in the rotary crush drum 3. The overall axial width L2 of the plurality of crushing blades 311 can be easily set.

As shown in FIGS. 3 to 5, the perforated plate 5 of this example has an arc shape along a circular shape on the outer periphery of the rotary crushing drum 3. The perforated plate 5 is disposed below the whole of the plurality of crushing blade constituting portions 31 in the rotary crushing drum 3 and is spanned between the second side walls 21 </ b> B of the base cover 2. The perforated plate 5 has a number of drop holes 51 formed therein.
In addition, the perforated plate 5 can be comprised using the punching metal formed in many through holes.

The chip crushing apparatus 1 of this example is configured to include the base cover 2, the rotary crushing drum 3, the rotation drive source 4, and the perforated plate 5, and the base cover 2 is discharged from the chip conveying conveyor 6. Used directly attached to the lower part of 61. Thereby, the chip crushing apparatus 1 of this example does not need to be installed on the floor surface in a factory using a stand or the like, and can be installed in a suspended state on the discharge unit 61 of the chip conveying conveyor 6. Therefore, the chip crushing apparatus 1 can be installed in a factory with space efficiency.
Moreover, the chip crushing apparatus 1 uses the base cover 2 directly attached to the lower part of the discharge part 61 of the chip conveyance conveyor 6, and is a box which collects the crushing chips K2 after crushing in the lower position. It is possible to secure a sufficient arrangement space.

Next, in the chip crushing apparatus 1 of this example, the chip K1 is crushed as follows.
That is, the long chip K1 discharged from the discharge unit 61 of the chip conveyor 6 is transferred from the upper end opening 201 of the base cover 2 to the rotary crushing drum 3 surrounded by the side wall 21 of the base cover 2. Supplied. At this time, the chip crushing device 1 directly cuts from the discharge unit 61 of the chip conveying conveyor 6 to the rotary crushing drum 3 surrounded by the side wall 21 of the base cover 2 without using a chip converging means such as a hopper. Powder K1 can be received. Thereby, when receiving the chip K1, the delivery flow of the chip K1 is not restricted, and the chip K1 can be stably supplied to the rotary crushing drum 3.

  Further, the rotary shaft 300 of the rotary crushing drum 3 is arranged in parallel with the rotary shaft 620 of the discharge side end 621 of the conveying caterpillar 62 in the chip conveying conveyor 6, and a plurality of crushing blades 311 in the rotary crushing drum 3 are arranged. The overall axial width L <b> 2 is slightly larger than the axial width L <b> 1 of the discharge side end 621 of the transport caterpillar 62. Thereby, almost all of the chips K1 supplied from the discharge side end 621 of the transport caterpillar 62 can be directly transferred to the crushing blade 311.

  Therefore, the chips K1 can be stably wound between the rotary crushing drum 3 and the side wall 21 of the base cover 2 by the plurality of crushing blades 311 in the rotary crushing drum 3, and the plurality of crushing blades 311 and the gaps are adjusted. The chips K1 can be stably crushed by the gap between the block 24 and the gap between the plurality of crushing blades 311 and the perforated plate 5. Then, the crushed swarf K2 can be dropped from the plurality of drop holes 51 in the perforated plate 5 and collected in a box or the like disposed below the swarf crushing device 1.

The crushed chips K2 can be further refined by dropping the crushed chips K2 from the plurality of dropping holes 51.
Further, the rotary crushing drum 3 can normally be rotated in the same direction as the rotation direction of the transporting caterpillar 62, and in order to prevent the chips K1 from being clogged in the chip crushing apparatus 1, a predetermined amount is appropriately selected. Reverse rotation is possible at the timing.

Moreover, the chip crushing apparatus 1 of this example attaches the base cover 2 directly to the lower part of the discharge part 61 of the chip conveyance conveyor 6, thereby greatly reducing the distance between the conveyance caterpillar 62 and the rotary crushing drum 3. can do. Thereby, the chip K1 can be more stably wound between the rotary crushing drum 3 and the gap adjusting block 24 of the base cover 2, and the chips K1 can be stably crushed by the plurality of crushing blades 311. Can do.
Therefore, according to the chip crushing apparatus 1 of this example, the installation space can be reduced and the chip K1 can be stably crushed.

Cross-sectional explanatory drawing which shows the chip crushing apparatus of the state seen from the axial direction of the rotary crushing drum in an Example. Cross-sectional explanatory drawing which shows the chip crushing apparatus of the state seen from the side of the rotary crushing drum in an Example. Cross-sectional explanatory drawing which expands and shows the principal part of the chip crushing apparatus of the state seen from the axial direction of the rotary crushing drum in an Example. Cross-sectional explanatory drawing which expands and shows the principal part of the chip crushing apparatus of the state seen from the side of the rotary crushing drum in an Example. Cross-sectional explanatory drawing which expands and shows the principal part of the chip crushing apparatus of the state seen from the upper direction of the rotary crushing drum in an Example. Cross-sectional explanatory drawing which shows the rotary crushing drum comprised using the crushing blade structure part and the inclination crushing blade structure part in an Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Chip crushing apparatus 2 Base cover 201 Upper end opening 202 Lower end opening 21 Side wall 24 Gap adjustment block 3 Rotating crushing drum 30 Center shaft part 300 Rotating shaft 31 Crushing blade constituent part 31A Inclined crushing blade constituent part 311 Crushing blade 311A Inclined crushing Blade 312 Concave part 4 Rotation drive source 5 Hole plate 51 Falling hole 6 Chip conveying conveyor 61 Discharge part 62 Conveying caterpillar 620 Rotating shaft 621 Discharge side end K1 Chip K2 Crushed chip

Claims (6)

A device for crushing long chips discharged from a discharge part of a chip conveying conveyor attached to a cutting machine,
The chip crushing device includes a base cover directly attached to a lower portion of the discharge portion of the chip conveying conveyor, a rotary crushing drum that includes a plurality of crushing blades and is rotatably supported in the base cover, and the rotary crushing A rotation drive source for rotating the drum, and a perforated plate provided in the base cover at a predetermined interval below the rotary crushing drum;
The base cover has a side wall that encloses the side of the rotary crushing drum, and has an opening in the vertical direction,
The chips received from the discharge unit are crushed by the plurality of crushing blades in the rotary crushing drum, and the crushed chips are configured to fall from a plurality of dropping holes in the perforated plate,
The rotation shaft of the rotary crushing drum is arranged in parallel with the rotation axis of the discharge side end of the transport caterpillar for transporting the chips in the chip transport conveyor,
The whole of the plurality of crushing blades in the rotary crushing drum has an axial width of 80% or more of an axial width of a discharge side end portion of the transport caterpillar.   2. The chip crushing device according to claim 1, wherein the crushing blade is formed by a plurality of convex surfaces projecting radially in a radial direction of the rotary crushing drum.   3. The chip crushing device according to claim 1, wherein the rotary crushing drum is configured by connecting a plurality of crushing blade constituent portions in the axial direction.   4. The chip crushing apparatus according to claim 3, wherein the rotary crushing drum is formed by changing the formation state of the crushing blades between the crushing blade constituent portions adjacent to each other. In Claim 3, the crushing blade in the crushing blade constituting portion is formed by a plurality of convex surfaces projecting radially in the radial direction of the rotary crushing drum,
The rotary crushing drum is formed by arranging the plurality of crushing blades in a lattice shape by shifting the phases in the circumferential direction between the crushing blade constituent portions adjacent to each other.   6. The base cover according to claim 1, wherein the base cover is provided with a gap adjustment block capable of changing a gap between the base cover and the outer side of the rotary crushing drum. A chip crusher characterized by comprising:

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