A crushing instrument

Abstract

The present invention provides a crusher, belonging to the technical field of crushers. It solves the problem that the existing crushers will cause moisture loss in grains when crushing grains. The crusher includes a movable grinding disc and a fixed grinding disc located in an abrasive shell and arranged close to each other, a driver can drive the movable grinding disc to rotate relative to the fixed grinding disc, an abrasive cavity connected to a feeding structure is provided between the movable grinding disc and the fixed grinding disc, the bottom of the abrasive shell has a discharge channel that connects the abrasive cavity with a receiving box, a circle of movable grinding grooves is provided on the circumferential outer side of one side of the movable grinding disc, a movable grinding bar is provided at the circumferential middle of one side of the movable grinding disc, a circle of fixed grinding grooves is provided on the circumferential outer side of one side of the fixed grinding disc, a fixed grinding bar is provided at the circumferential middle of one side of the fixed grinding disc, the movable grinding grooves and the fixed grinding grooves are arranged relative to each other, and the movable grinding bars and the fixed grinding bars are arranged relative to each other and are both located in the abrasive cavity. The crusher has the advantages of being able to beat grains into powder without causing moisture loss in the grains.

Description

Technical Field

[0001] The invention belongs to the technical field of crushers and relates to a crusher. Background Art

[0002] A crusher usually refers to an instrument or device used to crush solid matter into smaller particles. It is widely used in chemical, pharmaceutical, food and other industries.

[0003] Existing crushers, for example, Chinese patent literature discloses a hammer cyclone mill [patent number: 202322013046.4; application publication number: CN220496494U], which includes a casing and a feed hopper, a feeding mechanism, a grinding mechanism, a heat dissipation mechanism and a gathering mechanism located in the casing. The feed hopper, the feeding mechanism, the grinding mechanism and the gathering mechanism are connected by pipelines. The heat dissipation mechanism includes a cooling fan and a water cooling plate. The cooling fan is installed in the casing and opposite to the grinding mechanism, and the water cooling plate is installed in the grinding mechanism.

[0004] The hammer cyclone mill of this structure can grind a large amount of powder at one time. However, the grains enter the grinding mechanism through the feed hopper and the feeding mechanism. The grinding mechanism includes a knife holder, and knife particles are fixed to the knife holder. The knife particles are rotated by the rotation of the knife holder, so that the knife holder and the knife particles collide with the grains, thereby breaking the grains. However, in this crushing method, the grains are still relatively large after crushing. At the same time, the hammer cyclone mill of this structure has a high-speed rotation of the knife holder, and the grains collide with the knife holder, and the grains collide with each other, which will generate friction and heat, and evaporate the moisture in the grains. Since the high-speed rotation of the knife holder will generate a strong airflow, the evaporated moisture will be discharged with the airflow, resulting in the loss of moisture in the grains. Summary of the invention

[0005] The purpose of the present invention is to solve the above problems in the prior art and propose a crushing machine to solve the technical problem of how to make the crushing machine grind grains into powder without causing water loss in the grains.

[0006] The object of the present invention can be achieved through the following technical scheme: a crusher comprises a chassis, a feeding structure arranged in the chassis, a drive, an abrasive shell and a material receiving box, characterized in that it also comprises a movable grinding disc and a fixed grinding disc located in the abrasive shell and arranged close to each other, the drive can drive the movable grinding disc to rotate relative to the fixed grinding disc, an abrasive cavity connected to the feeding structure is provided between the movable grinding disc and the fixed grinding disc, the bottom of the abrasive shell has a discharge channel connecting the abrasive cavity with the material receiving box, a circle of movable grinding grooves is provided on the circumferential outer side of one side of the movable grinding disc, a plurality of protruding and spaced movable grinding strips are provided at the circumferential middle of one side of the movable grinding disc, a circle of fixed grinding grooves is provided on the circumferential outer side of one side of the fixed grinding disc, a plurality of protruding and spaced fixed grinding strips are provided at the circumferential middle of one side of the fixed grinding disc, the movable grinding groove and the fixed grinding groove are arranged opposite to each other, the movable grinding strips and the fixed grinding strips are arranged opposite to each other and are both located in the abrasive cavity.

[0007] During processing, the grains are poured into the feeding structure, and the feeding structure transports the grains into the abrasive cavity. The driver drives the dynamic grinding disc to rotate, and the dynamic grinding disc drives the dynamic grinding bar to rotate, thereby driving the grains in the abrasive cavity to rotate. The dynamic grinding bar and the fixed grinding bar cooperate to grind the grains and make the grains into small particles. The dynamic grinding disc and the fixed grinding disc are set close to each other, and the gap between the dynamic grinding groove and the fixed grinding groove is small. Small grains will enter the gap between the dynamic grinding groove and the fixed grinding groove. Since the dynamic grinding groove rotates relative to the fixed grinding groove, the small grains are ground into powder by the grinding disc. The powder then enters the abrasive shell and enters the receiving box through the feeding channel to complete the grain crushing process and beat the grains into powder. The crusher first breaks the large grains into small grains by cooperating with the dynamic grinding bar and the fixed grinding bar, and then grinds the small grains into powder by cooperating with the dynamic grinding groove and the fixed grinding groove. The grains can be beaten into powder in one processing, and the processing efficiency is high. Since the grains are ground into powder by means of the moving grinding disc and the fixed grinding disc, no heat is generated in the process of grinding and no moisture is lost in the grains. Meanwhile, the grinding takes place in a relatively closed abrasive cavity and is located inside the abrasive shell. The powdered grains flow out by their own gravity and no moisture is lost in the grains, thereby locking in moisture in the powdered grains and improving the detection accuracy of grains in detection items such as mycotoxins.

[0008] In the above-mentioned crusher, the abrasive shell has a feeding cavity with a circular cross-section along the vertical direction, the movable grinding disc is located in the feeding cavity, the outer peripheral wall of the movable grinding disc has a stabilizing ring protruding outward along the circumferential direction, at least one feeding rod is fixedly connected to the stabilizing ring, the feeding rod is arranged along the axial direction of the feeding cavity, there is a certain distance between the feeding rod and the cavity wall of the feeding cavity, and the feeding channel is connected to the bottom of the feeding cavity. The stabilizing ring plays a stabilizing role, reduces the shaking of the movable grinding disc during rotation, and improves the stability of the movable grinding disc. At the same time, the stabilizing ring also serves as a mounting carrier for the feeding rod. When the stabilizing ring rotates with the movable grinding disc, it will drive the feeding rod to rotate. The feeding rod moves along the circumferential cavity wall of the feeding cavity. The feeding rod will not contact the abrasive shell. The rotation of the feeding rod will generate a fine airflow, and the airflow, combined with the gravity of the powder itself, is sufficient to make the powder attached to the cavity wall of the feeding cavity flow to the feeding channel, thereby ensuring the feeding of the powder.

[0009] In the above-mentioned crusher, the number of the feed rods is 2-6, and all the feed rods are symmetrically arranged around the center of the moving grinding disc. The symmetrical arrangement of the feed rods will not reduce the stability of the moving grinding disc, so that the moving grinding disc rotates stably, thereby making the crusher work stably.

[0010] In the above-mentioned crusher, the cross section of the movable grinding groove along the circumference of the movable grinding disc is serrated, and the cross section of the fixed grinding groove along the circumference of the fixed grinding disc is serrated. This structure enables the movable grinding groove and the fixed grinding groove to cooperate to better grind small grains into powder.

[0011] In the above-mentioned crushing machine, all the moving grinding bars are arranged in a ring shape, and all the moving grinding bars are arranged in a radial direction of the moving grinding disc at an angle, and all the fixed grinding bars are arranged in a ring shape, and all the fixed grinding bars are arranged in a radial direction of the fixed grinding disc at an angle. This structure enables the moving grinding bars to better drive the large grains to rotate, and the moving grinding bars and the fixed grinding bars cooperate to better break the large grains into small grains.

[0012] In the above-mentioned crusher, one side of the moving grinding disc has a circle of first guide walls arranged obliquely inwardly along the center of the moving grinding disc toward the surroundings, the circumferential outer side of the first guide wall is connected to the circumferential inner side of a circle of the moving grinding grooves, the moving grinding bars are partially arranged close to the first guide wall, and the width between the inner ends of two adjacent moving grinding bars is smaller than the width between the outer ends. The first guide wall has a guiding function, and the moving grinding bars have a guiding function in addition to the crushing function. The first guide wall and the moving grinding bars can guide small grains to flow to the gap between the moving grinding groove and the fixed grinding groove, so that the grains can be ground into powder faster, thereby improving the processing efficiency of the crusher.

[0013] In the above-mentioned crusher, one side of the fixed grinding disc has a circle of second guide walls arranged obliquely inwardly along the center of the fixed grinding disc toward the surroundings, the circumferential outer side of the second guide wall is connected to the circumferential inner side of a circle of the fixed grinding grooves, the fixed grinding bars are partially arranged close to the second guide wall, and the width between the inner ends of two adjacent fixed grinding bars is smaller than the width between the outer ends. The second guide wall has a guiding function, and the fixed grinding bars have a guiding function in addition to the crushing function. The second guide wall and the fixed grinding bars can guide small grains to flow to the gap between the dynamic grinding groove and the fixed grinding groove, so that the grains can be ground into powder faster, thereby improving the processing efficiency of the crusher.

[0014] In the above-mentioned crusher, an adjustment column is also provided in the abrasive shell, the fixed grinding disc is fixedly connected to the adjustment column, and a feeding channel is provided in the adjustment column, the feeding channel connects the feeding structure with the center of the abrasive cavity, and the outer peripheral wall of the adjustment column is tightly fitted with the inner side wall of the abrasive shell. The setting of the adjustment column plays a role in positioning the fixed grinding disc so that the fixed grinding disc can be fixed in the abrasive shell, the adjustment column also plays a role in a material channel so that the feeding structure can transport grains into the abrasive cavity, and the adjustment column also plays a role in blocking the feeding cavity, ensuring that the grain powder in the feeding cavity flows to the receiving box through the feeding channel.

[0015] In the above-mentioned crusher, an adjusting cover is fixedly connected to the abrasive shell by threaded connection, and an adjusting spring is arranged between the adjusting column and the abrasive shell. Under the action of the elastic force of the adjusting spring, the adjusting column abuts against the adjusting cover, so that the fixed grinding disc always has a tendency to move away from the moving grinding disc. The position of the adjusting column and the fixed grinding disc can be adjusted by rotating the adjusting cover, and the distance between the moving grinding disc and the fixed grinding disc can be controlled, thereby controlling the distance between the moving grinding groove and the fixed grinding groove, so that the crusher can control the coarseness of the powder; at the same time, the fixed grinding disc can be moved to increase the gap between the moving grinding groove and the fixed grinding groove, so that the larger grains that have not been ground completely in the abrasive cavity can flow out.

[0016] In the above-mentioned crusher, the adjustment column includes a protruding adjustment part, the abrasive shell has an adjustment channel, the outer end of the adjustment channel passes through the abrasive shell and is blocked by the adjustment screw cover, the inner end of the adjustment channel has an annular retaining edge, the outer end of the adjustment part passes through the annular retaining edge and extends into the adjustment channel, the outer end of the adjustment part is detachably connected with a retaining spring, the adjustment spring is located in the adjustment channel, and one end of the adjustment spring acts on the annular retaining edge, and the other end acts on the retaining spring.

[0017] Compared with the prior art, the crusher provided by the present invention has the following advantages:

[0018] 1. This crusher first breaks large grains into small grains through the cooperation of the moving grinding bars and the fixed grinding bars, and then grinds the small grains into powder through the cooperation of the moving grinding groove and the fixed grinding groove. The grains can be ground into powder in one processing, which is convenient for processing. The diameters of the moving grinding disc and the fixed grinding disc of this crusher are large, and the grains can be ground into powder with a fineness of more than 20 meshes, so that the grain powder can reach the fineness of the detection of mycotoxins.

[0019] 2. A stabilizing ring is arranged on the outer side of the circumference of the moving grinding disc of the crusher. The stabilizing ring reduces the shaking of the moving grinding disc during rotation and improves the stability of the moving grinding disc. At the same time, the stabilizing ring also serves as a mounting carrier for the feeding rod. The fine airflow generated by the rotation of the feeding rod and the gravity of the powder itself make the powder attached to the wall of the feeding chamber flow to the feeding channel to ensure the feeding of the powder.

[0020] 3. This crusher grinds grains into powder by means of moving grinding disc and fixed grinding disc. No heat is generated in the process of grinding and no moisture is lost in the grains. Meanwhile, grinding takes place in a relatively closed abrasive cavity and is located inside the abrasive shell. The powdered grains flow out by their own gravity without losing moisture in the grains, thereby locking moisture in the powdered grains and improving the detection accuracy of grains in mycotoxin and other detection items. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the crusher.

[0022] Figure 2 It is a cross-sectional view of the overall structure of the crusher.

[0023] Figure 3 It is a cross-sectional view of the abrasive shell, movable grinding disc and fixed grinding disc of the crusher.

[0024] Figure 4 It is a schematic diagram of the overall structure of the movable grinding disc of the crusher.

[0025] Figure 5 It is a schematic diagram of the overall structure of the fixed grinding disc of the crusher.

[0026] In the figure, 1. chassis; 2. feeding structure; 3. driver; 4. abrasive shell; 5. receiving box; 6. moving grinding disc; 61. moving grinding groove; 62. moving grinding strip; 63. stabilizing ring; 64. first guide wall; 7. fixed grinding disc; 71. fixed grinding groove; 72. fixed grinding strip; 73. second guide wall; 8. abrasive cavity; 9. unloading channel; 10. unloading cavity; 11. unloading rod; 12. adjusting column; 121. feeding channel; 122. adjusting part; 13. adjusting screw cover; 14. adjusting spring; 15. adjusting channel; 16. annular retaining edge; 17. retaining spring. DETAILED DESCRIPTION

[0027] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0028] like Figure 1 , Figure 2 As shown, the crusher includes a chassis 1, a feeding structure 2, a driver 3, an abrasive shell 4, a receiving box 5, a movable grinding disc 6, a fixed grinding disc 7, an adjustment column 12 and an adjustment screw cover 13.

[0029] The feeding structure 2 is arranged on the chassis 1, and the feeding structure 2 is composed of a feeding funnel and a vibrator. The driver 3 is a combination of a driving motor and a reducer. The abrasive shell 4 includes a first shell and a second shell. The first shell and the second shell are hinged and locked by a lock. The receiving box 5 is a drawer type.

[0030] like Figure 3 As shown, the movable grinding disc 6 and the fixed grinding disc 7 are both located in the abrasive shell 4 and are arranged close to each other, and an abrasive cavity 8 is provided between the movable grinding disc 6 and the fixed grinding disc 7. The abrasive shell 4 has a feeding cavity 10 with a circular cross section along the vertical direction, and the movable grinding disc 6 is located in the feeding cavity 10. The outer peripheral wall of the movable grinding disc 6 has a stabilizing ring 63 protruding outward along the circumferential direction, and a feeding rod 11 is fixedly connected to the stabilizing ring 63. The feeding rod 11 is arranged along the axial direction of the feeding cavity 10, and there is a certain distance between the feeding rod 11 and the cavity wall of the feeding cavity 10. The bottom of the abrasive shell 4 has a feeding channel 9, which is connected to the bottom of the feeding cavity 10, and the abrasive cavity 8 is connected to the receiving box 5 through the feeding cavity 10 and the feeding channel 9.

[0031] In this embodiment, the number of the discharge rods 11 is two, and all the discharge rods 11 are symmetrically arranged around the center of the movable grinding disc 6. In actual production, the number of the discharge rods 11 may be three or six.

[0032] like Figure 4 As shown, the outer circumferential side of one side of the moving grinding disc 6 has a circle of moving grinding grooves 61, and the cross section of the moving grinding grooves 61 along the circumference of the moving grinding disc 6 is serrated. In this embodiment, the middle of the circumference of one side of the moving grinding disc 6 has twelve protruding and spaced moving grinding bars 62. In actual production, the number of moving grinding bars 62 can be six or eighteen. All the moving grinding bars 62 are arranged in a ring shape, and all the moving grinding bars 62 are inclined along the radial direction of the moving grinding disc 6. One side of the moving grinding disc 6 has a circle of first guide walls 64 that are inclined inwardly along the center of the moving grinding disc 6 toward the surroundings. The outer circumferential side of the first guide wall 64 is connected to the inner circumferential side of a circle of moving grinding grooves 61. The moving grinding bars 62 are partially arranged close to the first guide wall 64, and the width between the inner ends of two adjacent moving grinding bars 62 is smaller than the width between the outer ends.

[0033] like Figure 5As shown, the circumferential outer side of one side of the fixed grinding disc 7 has a circle of fixed grinding grooves 71, and the cross section of the fixed grinding grooves 71 along the circumference of the fixed grinding disc 7 is serrated, and the dynamic grinding grooves 61 and the fixed grinding grooves 71 are arranged opposite to each other. In this embodiment, the circumferential middle of one side of the fixed grinding disc 7 has twelve protruding and spaced fixed grinding bars 72. In actual production, the number of fixed grinding bars 72 can be six or eighteen. All the fixed grinding bars 72 are arranged in an annular shape, and all the fixed grinding bars 72 are arranged obliquely along the radial direction of the fixed grinding disc 7. One side of the fixed grinding disc 7 has a circle of second guide walls 73 arranged obliquely inwardly along the center of the fixed grinding disc 7 toward the surrounding direction, and the circumferential outer side of the second guide wall 73 is connected to the circumferential inner side of a circle of fixed grinding grooves 71, and the fixed grinding bars 72 are partially arranged close to the second guide wall 73, and the width between the inner ends of two adjacent fixed grinding bars 72 is smaller than the width between the outer ends. The dynamic grinding bars 62 and the fixed grinding bars 72 are arranged opposite to each other and are both located in the abrasive cavity 8. The driver 3 can drive the movable grinding disc 6 to rotate relative to the fixed grinding disc 7.

[0034] An adjusting column 12 is also provided in the abrasive shell 4, and the fixed grinding disc 7 is fixedly connected to the adjusting column 12. The adjusting column 12 has a feeding channel 121, which connects the feeding structure 2 with the center of the abrasive cavity 8. The outer peripheral wall of the adjusting column 12 is tightly fitted with the inner wall of the abrasive shell 4.

[0035] An adjusting cover 13 is fixedly connected to the abrasive shell 4 by a threaded connection. The adjusting column 12 includes a protruding adjusting portion 122. An adjusting channel 15 is provided in the abrasive shell 4. The outer end of the adjusting channel 15 passes through the abrasive shell 4 and is blocked by the adjusting cover 13. The inner end of the adjusting channel 15 has an annular retaining edge 16. The outer end of the adjusting portion 122 passes through the annular retaining edge 16 and extends into the adjusting channel 15. The outer end of the adjusting portion 122 is detachably fixedly connected with a retaining spring 17. The adjusting spring 14 is located in the adjusting channel 15, and one end of the adjusting spring 14 acts on the annular retaining edge 16, and the other end acts on the retaining spring 17. Under the action of the elastic force of the adjusting spring 14, the adjusting column 12 abuts against the adjusting cover 13, so that the fixed grinding disc 7 always has a tendency to stay away from the movable grinding disc 6.

[0036] During processing, the grains are poured into the feeding structure 2, and the feeding structure 2 transports the grains into the abrasive chamber 8. The driver 3 drives the dynamic grinding disc 6 to rotate, and the dynamic grinding disc 6 drives the dynamic grinding bar 62 to rotate, thereby driving the grains located in the abrasive chamber 8 to rotate. The dynamic grinding bar 62 and the fixed grinding bar 72 cooperate to break the grains into small particles. The small grain particles will enter the gap between the dynamic grinding groove 61 and the fixed grinding groove 71, and the small grain particles will be ground into powder. Then the powder falls into the discharge chamber 10, and then enters the receiving box 5 through the discharge channel 9.

[0037] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0038] Although the terms such as chassis 1, feeding structure 2, driver 3, abrasive shell 4, receiving box 5, movable grinding disc 6, movable grinding groove 61, movable grinding strip 62, stabilizing ring 63, first guide wall 64, fixed grinding disc 7, fixed grinding groove 71, fixed grinding strip 72, second guide wall 73, abrasive cavity 8, unloading channel 9, unloading cavity 10, unloading rod 11, adjusting column 12, feeding channel 121, adjusting part 122, adjusting rotary cover 13, adjusting spring 14, adjusting channel 15, annular retaining edge 16, and retaining spring 17 are used more frequently in this article, the possibility of using other terms is not excluded. The use of these terms is only for more convenient description and explanation of the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A crusher, comprising a chassis (1), a feeding structure (2) arranged in the chassis (1), a driver (3), an abrasive shell (4) and a material receiving box (5), characterized in that: The abrasive shell (4) further comprises a movable grinding disc (6) and a fixed grinding disc (7) which are located in the abrasive shell (4) and are arranged close to each other. The driver (3) can drive the movable grinding disc (6) to rotate relative to the fixed grinding disc (7). An abrasive cavity (8) which is connected to the feeding structure (2) is provided between the movable grinding disc (6) and the fixed grinding disc (7). The bottom of the abrasive shell (4) has a discharge channel (9) which connects the abrasive cavity (8) with the receiving box (5). One side of the movable grinding disc (6) is provided with a The outer side of the movable grinding disc (6) has a circle of movable grinding grooves (61), the middle of the circumference of one side of the movable grinding disc (6) has a plurality of movable grinding strips (62) protruding and spaced apart, the outer side of the fixed grinding disc (7) has a circle of fixed grinding grooves (71), the middle of the circumference of one side of the fixed grinding disc (7) has a plurality of fixed grinding strips (72) protruding and spaced apart, the movable grinding grooves (61) and the fixed grinding grooves (71) are arranged opposite to each other, and the movable grinding strips (62) and the fixed grinding strips (72) are arranged opposite to each other. The abrasive shell (4) is provided with a feed cavity (10) having a circular cross section in the vertical direction, the movable grinding disc (6) is located in the feed cavity (10), and the outer peripheral wall of the movable grinding disc (6) has a stabilizing ring (63) protruding outward in the circumferential direction, the stabilizing ring (63) is located on the other side of the movable grinding disc (6) and the thickness of the stabilizing ring (63) is less than the thickness of the movable grinding disc (6), and the outer peripheral wall of the stabilizing ring (63) is provided with a stabilizing ring (63) protruding outward in the circumferential direction. The wall is close to the circumferential cavity wall of the material discharge cavity (10) and there is a gap between the circumferential cavity wall of the material discharge cavity (10); at least one material discharge rod (11) is fixedly connected to the stabilizing ring (63); the material discharge rod (11) is arranged along the axial direction of the material discharge cavity (10); the material discharge rod (11) is close to the circumferential cavity wall of the material discharge cavity (10) and there is a gap between the circumferential cavity wall of the material discharge cavity (10); the material discharge channel (9) is connected to the bottom of the material discharge cavity (10).

2. A crusher according to claim 1, characterized in that: The number of the feed rods (11) is 2-6, and all of the feed rods (11) are symmetrically arranged around the center of the movable grinding disc (6).

3. A crusher according to claim 1 or 2, characterized in that: The cross section of the movable grinding groove (61) along the circumference of the movable grinding disc (6) is in a sawtooth shape, and the cross section of the fixed grinding groove (71) along the circumference of the fixed grinding disc (7) is in a sawtooth shape.

4. A crusher according to claim 1 or 2, characterized in that: All of the movable grinding bars (62) are arranged in a ring shape, and all of the movable grinding bars (62) are arranged obliquely along the radial direction of the movable grinding disc (6); all of the fixed grinding bars (72) are arranged in a ring shape, and all of the fixed grinding bars (72) are arranged obliquely along the radial direction of the fixed grinding disc (7).

5. A crusher according to claim 1 or 2, characterized in that: One side of the movable grinding disc (6) has a circle of first guide walls (64) arranged obliquely inwardly along the center of the movable grinding disc (6) toward the surrounding area, the circumferential outer side of the first guide wall (64) is connected to the circumferential inner side of a circle of the movable grinding grooves (61), the movable grinding strips (62) are partially arranged close to the first guide wall (64), and the width between the inner ends of two adjacent movable grinding strips (62) is smaller than the width between the outer ends.

6. A crusher according to claim 1 or 2, characterized in that: One side of the fixed grinding disc (7) has a circle of second guide walls (73) arranged obliquely inwardly from the center of the fixed grinding disc (7) toward the surroundings, the circumferential outer side of the second guide wall (73) is connected to the circumferential inner side of a circle of the fixed grinding grooves (71), the fixed grinding strips (72) are partially arranged close to the second guide wall (73), and the width between the inner ends of two adjacent fixed grinding strips (72) is smaller than the width between the outer ends.

7. A crusher according to claim 1 or 2, characterized in that: The abrasive shell (4) is further provided with an adjusting column (12), the fixed grinding disc (7) is fixedly connected to the adjusting column (12), the adjusting column (12) has a feeding channel (121), the feeding channel (121) enables the feeding structure (2) to communicate with the center of the abrasive cavity (8), and the outer peripheral wall of the adjusting column (12) is tightly fitted with the inner side wall of the abrasive shell (4).

8. A crusher according to claim 7, characterized in that: An adjusting cover (13) is fixedly connected to the abrasive shell (4) by means of a threaded connection, and an adjusting spring (14) is provided between the adjusting column (12) and the abrasive shell (4). Under the action of the elastic force of the adjusting spring (14), the adjusting column (12) abuts against the adjusting cover (13), so that the fixed grinding disc (7) always has a tendency to move away from the movable grinding disc (6).

9. A crusher according to claim 8, characterized in that: The adjusting column (12) comprises a protruding adjusting portion (122); the abrasive shell (4) has an adjusting channel (15); the outer end of the adjusting channel (15) passes through the abrasive shell (4) and is blocked by the adjusting screw cover (13); the inner end of the adjusting channel (15) has an annular retaining edge (16); the outer end of the adjusting portion (122) passes through the annular retaining edge (16) and extends into the adjusting channel (15); the outer end of the adjusting portion (122) is detachably fixedly connected with a retaining spring (17); the adjusting spring (14) is located in the adjusting channel (15); one end of the adjusting spring (14) acts on the annular retaining edge (16) and the other end acts on the retaining spring (17).

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