Smashing device for graded grinding

Abstract

The utility model discloses a crushing device for graded grinding, which belongs to the field of grinding devices and comprises a base station. A multi-stage grinding mechanism used for grinding materials is installed on the base table. The multi-stage grinding mechanism is composed of a head-section grinding roller at the left end, a tail-section grinding roller at the right end and a plurality of middle-section grinding rollers located between the head-section grinding roller and the tail-section grinding roller. The right end of the head-section grinding roller is detachably connected with the left ends of the middle-section grinding rollers through roller connecting assemblies, the left end of the tail-section grinding roller is detachably connected with the right ends of the middle-section grinding rollers through roller connecting assemblies, and the adjacent middle-section grinding rollers are detachably connected through roller connecting assemblies; by means of the mode, the grinding frequency can be adjusted according to the required fineness of the materials, the grinding accuracy is improved, and the corresponding energy consumption can be reduced.

Description

A pulverizing device for graded grinding Technical Field

[0001] This utility model relates to the field of grinding devices, specifically to a pulverizing device for graded grinding. Background Technology

[0002] Calcium stearate, as an important chemical raw material, is widely used in industries such as plastics, rubber, coatings, and papermaking. Its particle size distribution directly affects the performance of the products. For example, in the plastics industry, the finer the particle size, the better the dispersibility, and the higher the transparency and surface gloss of the products. In the rubber industry, the finer the particle size, the better the reinforcing effect, and the better the mechanical properties of the products. In the lubricant industry, medium particle size is required to provide a good lubrication effect. Overly fine particles may result in an excessively thin lubricating film, which may reduce the lubrication performance.

[0003] Chinese patent CN109622152B discloses a horizontal multi-stage rolling ball mill, including an inner grinding cylinder, a feed cylinder, a rolling ball mill body, and an outer grinding cylinder. The inner grinding cylinder is installed inside the outer grinding cylinder, and a feed cylinder is welded to one end of the inner grinding cylinder. Several stirring rods are welded to the rotating shaft inside the inner grinding cylinder. The interior of the inner grinding cylinder is configured as a primary grinding chamber, containing several grinding balls. A rolling ball mill body is installed between the inner and outer grinding cylinders. An inner grinding chamber is formed between the main body and the inner grinding cylinder, and several inner grinding balls are installed in the inner grinding chamber. An outer grinding chamber is formed between the main body and the outer grinding cylinder, and several outer grinding balls are installed in the outer grinding chamber. The grinding balls impact the material for initial grinding; the material is then further ground by the inner grinding balls; and finally, it is further ground by the outer grinding chamber. This method achieves good grinding results, shortens grinding time, and yields material with uniform particle size, facilitating screening and separation of the ground material. However, this device still has the following problems:

[0004] 1. This device can only grind materials to the same level, and cannot adjust the fineness required for different materials.

[0005] 2. The ground particles were not screened. The coarse particles that were not ground properly will not be removed, which will affect the product quality.

[0006] Based on this, the present invention designs a pulverizing device for graded grinding to solve the above problems. Summary of the Invention

[0007] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a pulverizing device for graded grinding.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A pulverizing apparatus for graded grinding includes a base.

[0010] The base is equipped with a multi-stage grinding mechanism for grinding materials;

[0011] The multi-stage grinding mechanism consists of a first grinding roller at the left end, a tail grinding roller at the right end, and several intermediate grinding rollers located between the first and tail grinding rollers. The right end of the first grinding roller and the left end of the intermediate grinding rollers are detachably connected by a roller connecting assembly. The left end of the tail grinding roller and the right end of the intermediate grinding rollers are detachably connected by a roller connecting assembly. Adjacent intermediate grinding rollers are detachably connected by a roller connecting assembly. The left end of the first grinding roller and the right end of the tail grinding roller are both rotatably connected to the base.

[0012] The base is equipped with a vibrating screening mechanism for screening the ground material.

[0013] Furthermore, the first grinding roller, the right-end tail grinding roller, and the middle grinding roller are also equipped with water-cooling components and water-cooling connecting components; the base and the water-cooling connecting components are both connected to the water-cooling components; the water-cooling components are used to cool the first grinding roller, the right-end tail grinding roller, and the middle grinding roller, and the water-cooling connecting components are used to connect the multi-stage water-cooling components; a feed inlet is opened at the left end of the first grinding roller; a discharge outlet is opened at the right end of the tail grinding roller; and inner lining plates are fixedly connected to the inside of the first grinding roller, the middle grinding roller, and the tail grinding roller by screws.

[0014] Furthermore, the roller connecting assembly includes a lower clamping ring, an upper clamping ring, a rotating shaft, a screw, and retaining teeth; the right ends of the first and middle grinding rollers are fixedly connected to the lower clamping ring, the rear end of the lower clamping ring is fixedly connected to the rotating shaft, and the upper clamping ring is rotatably connected to the rotating shaft; the front ends of both the lower and upper clamping rings are provided with a screw hole; the screw hole is threadedly connected to the screw; the right end of the first grinding roller, the left and right ends of the middle grinding roller, and the left end of the tail grinding roller are all circumferentially arrayed with multiple retaining teeth; the right end of the first grinding roller, the left and right ends of the middle grinding roller, and the left end of the tail grinding roller are all fixedly connected to the retaining teeth.

[0015] Furthermore, the water-cooling assembly includes an inlet slip ring and an outlet slip ring; cold water pipes are installed inside the first grinding roller, the right-end tail grinding roller, and the middle grinding roller; the stator of the inlet slip ring is fixedly connected to the base; the rotor of the inlet slip ring is fixedly connected to the first grinding roller; the stator of the outlet slip ring is fixedly connected to the base, and the rotor of the outlet slip ring is fixedly connected to the tail grinding roller; an inlet is provided on the inlet slip ring, and an outlet is provided on the outlet slip ring; the rotors of the inlet and outlet slip rings are respectively connected to the inlet and outlet ends of the cold water pipes; all cold water pipes are connected through flexible hoses and water-cooling connection assemblies to form a water-cooling circulation system.

[0016] Furthermore, the water-cooled connection assembly includes a connection socket assembly and a connection interface assembly. The connection socket assembly is connected to the upper right side of the first grinding roller and the middle grinding roller, and the connection interface assembly is connected to the upper left side of the middle grinding roller and the tail grinding roller. The connection socket assembly is connected to the connection interface assembly.

[0017] Furthermore, the connection socket assembly includes a rotating ring, a first engagement block, and a first clamping block. The rotating ring is rotatably connected to the water cooling pipe. Multiple first engagement blocks are arranged in a circumferential array and fixedly installed on the right end of the rotating ring. The inner sidewall of the first engagement block is fixedly connected to the first clamping block. A second screw hole is provided at the upper end of the first engagement block.

[0018] Furthermore, the connection interface assembly includes a second biting block and a second clamping block. Multiple second biting blocks are arranged in a circumferential array and fixedly installed on the upper left side of the middle grinding roller and the tail grinding roller. A second clamping block is fixedly installed on the inner side wall of the second biting block. A second screw hole is opened on the outer side wall of the second clamping block. A sealing ring is fixedly installed on the side wall of the second clamping block away from the second biting block. A second screw is threadedly connected to the first biting block and the second biting block through the second screw hole.

[0019] Furthermore, the vibration screening mechanism includes a screening component and a limiting component. The screening component is connected to the tail section grinding roller; the screening component is connected to the base; the limiting component is connected to the screening component; the screening component is used to screen the ground product; and the limiting component is used to limit the screening component.

[0020] Furthermore, the screening component includes a cam, a housing, and a screen; the cam is fixedly connected to the right end of the tail grinding roller, the cam abuts against the upper end of the screen, and both the screen and the housing are connected to the limiting component.

[0021] Compared with the prior art, the advantages of this utility model are as follows: 1. This utility model adopts an adjustable grinding stage design, which allows the grinding times to be adjusted according to the fineness required by the material, which not only improves the grinding accuracy, but also reduces the corresponding energy consumption;

[0022] 2. This utility model can use the power of the grinding mill itself to drive the screening mechanism to screen the output materials, thereby improving product quality. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 is a perspective view of a pulverizing device for graded grinding according to the present invention;

[0025] Figure 2 is a front view of a pulverizing device for graded grinding according to the present invention;

[0026] Figure 3 is a left view of a pulverizing device for graded grinding according to the present invention;

[0027] Figure 4 is a partial perspective view of a pulverizing device for graded grinding according to the present invention;

[0028] Figure 5 shows a partial 3D view after a portion of the CC line in Figure 3 has been removed.

[0029] Figure 6 is an enlarged view of point A in Figure 4;

[0030] Figure 7 is an enlarged view of point B in Figure 4.

[0031] The labels in the diagram represent:

[0032] 1. Base; 2. Multi-stage grinding mechanism; 211. First grinding roller; 212. Middle grinding roller; 213. Tail grinding roller; 214. Feed inlet; 215. Discharge outlet; 216. Inner liner; 22. Roller connecting assembly; 221. Lower clamping ring; 222. Upper clamping ring; 223. Rotating shaft; 224. Screw hole one; 225. Screw one; 226. Clamping teeth; 23. Water cooling assembly; 231. Water inlet; 232. Discharge outlet 233. Water inlet; 234. Water outlet slip ring; 24. Water cooling connection assembly; 241. Rotating ring; 242. Engaging block one; 243. Clamping block one; 244. Screw hole two; 245. Engaging block two; 246. Clamping block two; 247. Screw two; 3. Vibrating screening mechanism; 31. Screening assembly; 311. Cam; 312. Housing; 313. Screen; 32. Limiting assembly; 321. Slide rod; 322. Spring. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0034] The terms "left," "right," "front," "back," "up," and "down" used in the following description refer to the orientation from the perspective of the front view.

[0035] Example 1: In some embodiments, please refer to Figures 1-7 of the accompanying drawings, a pulverizing device for graded grinding includes a base 1;

[0036] The base 1 is equipped with a multi-stage grinding mechanism 2 for grinding materials;

[0037] The multi-stage grinding mechanism 2 consists of a first grinding roller 211 at the left end, a tail grinding roller 213 at the right end, and several intermediate grinding rollers 212 located between the first grinding roller 211 and the tail grinding roller 213. The right end of the first grinding roller 211 and the left end of the intermediate grinding rollers 212 are detachably connected by a roller connecting assembly 22. The left end of the tail grinding roller 213 and the right end of the intermediate grinding rollers 212 are detachably connected by a roller connecting assembly 22. Adjacent intermediate grinding rollers 212 are detachably connected by a roller connecting assembly 22. The left end of the first grinding roller 211 and the right end of the tail grinding roller 213 are both rotatably connected to the base 1.

[0038] The first grinding roller 211, the right-end tail grinding roller 213, and the middle grinding roller 212 are also equipped with a water-cooling assembly 23 and a water-cooling connection assembly 24; the base 1 and the water-cooling connection assembly 24 are both connected to the water-cooling assembly 23; the water-cooling assembly 23 is used to cool the first grinding roller 211, the right-end tail grinding roller 213, and the middle grinding roller 212, and the water-cooling connection assembly 24 is used to connect the multi-stage water-cooling assembly 23; the left end of the first grinding roller 211 has a feed inlet 214; the right end of the tail grinding roller 213 has a discharge outlet 215; the inside of the first grinding roller 211, the middle grinding roller 212, and the tail grinding roller 213 are all fixedly connected with inner lining plates 216 by screws;

[0039] The base 1 is equipped with a vibrating screening mechanism 3 for screening the ground material;

[0040] In this invention, the operator connects the required number of grinding stages—the first grinding roller 211, the right-end tail grinding roller 213, and the middle grinding roller 212—together via the roller connecting assembly 22, according to the desired product fineness. Simultaneously, the water-cooling assembly 24 connects the water-cooling components 23 of the first grinding roller 211, the right-end tail grinding roller 213, and the middle grinding roller 212. The material is fed into the feed inlet 214 for grinding, while the water-cooling components 23 are connected to the inlet and outlet water pipes to cool the first grinding roller 211, the right-end tail grinding roller 213, and the middle grinding roller 212. The ground powder output from the discharge outlet 215 is then screened by the vibrating screening mechanism 3, which is driven by the tail grinding roller 213.

[0041] The roller connecting assembly 22 includes a lower clamping ring 221, an upper clamping ring 222, a rotating shaft 223, a screw 225, and retaining teeth 226. The right ends of the first grinding roller 211 and the middle grinding roller 212 are fixedly connected to the lower clamping ring 221, the rear end of the lower clamping ring 221 is fixedly connected to the rotating shaft 223, and the upper clamping ring 222 is rotatably connected to the rotating shaft 223. The front ends of the lower clamping ring 221 and the upper clamping ring 222 are each provided with a screw hole 224. The screw hole 224 is threadedly connected to the screw 225. The right end of the first grinding roller 211, the left and right ends of the middle grinding roller 212, and the left end of the tail grinding roller 213 are all circumferentially arrayed with multiple retaining teeth 226. The right end of the first grinding roller 211, the left and right ends of the middle grinding roller 212, and the left end of the tail grinding roller 213 are all fixedly connected to the retaining teeth 226.

[0042] The water-cooling assembly 23 includes an inlet slip ring 233 and an outlet slip ring 234; cold water pipes are installed in the first section grinding roller 211, the right end tail section grinding roller 213, and the middle section grinding roller 212; the stator of the inlet slip ring 233 is fixedly connected to the base 1; the rotor of the inlet slip ring 233 is fixedly connected to the first section grinding roller 211; the stator of the outlet slip ring 234 is fixedly connected to the base 1, and the rotor of the outlet slip ring 234 is fixedly connected to the tail section grinding roller 213; an inlet 231 is provided on the inlet slip ring 233, and an outlet 232 is provided on the outlet slip ring 234; the rotors of the inlet slip ring 233 and the outlet slip ring 234 are respectively connected to the inlet and outlet ends of the cold water pipes; all the cold water pipes are connected by flexible hoses and water-cooling connection assembly 24 to form a water-cooling circulation system;

[0043] The water-cooled connection assembly 24 includes a connection socket assembly and a connection interface assembly. The connection socket assembly is connected to the upper right side of the first grinding roller 211 and the middle grinding roller 212, and the connection interface assembly is connected to the upper left side of the middle grinding roller 212 and the tail grinding roller 213. The connection socket assembly is connected to the connection interface assembly.

[0044] The connection socket assembly includes a rotating ring 241, a first biting block 242, and a first abutting block 243. The rotating ring 241 is rotatably connected to the elastic hose. Multiple first biting blocks 242 are arranged in a circumferential array and fixedly installed on the right end of the rotating ring 241. The inner sidewall of the first biting block 242 is fixedly connected to the first abutting block 243. A second screw hole 244 is opened at the upper end of the first biting block 242.

[0045] The connection interface assembly includes a second biting block 245 and a second clamping block 246. Multiple biting blocks 245 are arranged in a circumferential array and fixedly installed on the upper left side of the middle grinding roller 212 and the tail grinding roller 213. The second clamping block 246 is fixedly installed on the inner side wall of the biting block 245. The second screw hole 244 is opened on the outer side wall of the second clamping block 246. A sealing ring is fixedly installed on the side wall of the second clamping block 246 away from the biting block 245. The second screw 247 is threadedly connected to the first biting block 242 and the second biting block 245 through the second screw hole 244.

[0046] In this utility model, the operator selects the first grinding roller 211, the middle grinding roller 212, and the last grinding roller 213 according to the required product fineness; then the teeth 226 between the first grinding roller 211, the middle grinding roller 212, and the last grinding roller 213 abut together; at this time, the first biting block 242 and the second biting block 245 are placed alternately, and then the rotating ring 241 is turned so that the first pressing block 243 and the second pressing block 246 press against and squeeze the sealing ring under the biting of the first biting block 242 and the second biting block 245. At this time, the elastic hose of the water cooling component 23 moves to the compensation position, and then the second screw 247 is aligned with the second screw hole 244 and the second screw 247 is unscrewed. 7. Fix the position so that the elastic hose of the water-cooling component 23 is connected; then rotate the upper clamping ring 222 around the rotating shaft 223 so that the front side of the upper clamping ring 222 is close to the front end of the lower clamping ring 221, and then tighten the screw 225 into the screw hole 224; so that the multiple lower clamping rings 221 and the multiple upper clamping rings 222 cooperate to clamp the first grinding roller 211, the middle grinding roller 212 and the tail grinding roller 213; the grinding device drive drives the first grinding roller 211 to rotate, and the rotation of the first grinding roller 211 drives the middle grinding roller 212 and the tail grinding roller 213 to rotate through the clamping teeth 226; thus realizing the adjustment of the grinding device for product fineness grading.

[0047] The vibration screening mechanism 3 includes a screening component 31 and a limiting component 32. The screening component 31 is connected to the tail grinding roller 213; the screening component 31 is connected to the base 1; the limiting component 32 is connected to the screening component 31; the screening component 31 is used to screen the ground products; the limiting component 32 is used to limit the screening component 31.

[0048] The screening component 31 includes a cam 311, a housing 312 and a screen 313. The cam 311 is fixedly connected to the right end of the tail grinding roller 213. The cam 311 abuts against the upper end of the screen 313. The screen 313 is slidably connected to the housing 312. Both the screen 313 and the housing 312 are connected to the limiting component 32.

[0049] The limiting component 32 includes a slide rod 321 and a spring 322; the lower end of the slide rod 321 is fixedly connected to the inner side of the outer shell 312, one end of the spring 322 is fixedly connected to the inner side of the outer shell 312, the other end of the spring 322 is fixedly connected to the screen 313, and the screen 313 is slidably connected to the slide rod 321 for limiting.

[0050] In this utility model, when the driving component of the grinding equipment drives the tail grinding drum 213 to rotate, the tail grinding drum 213 drives the cam 311 to rotate; the rotation of the cam 311, in conjunction with the spring 322, drives the screen 313 to slide back and forth along the slide bar 321 to screen the ground product.

[0051] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A pulverizing device for graded grinding, comprising a base (1), characterized in that: It also includes a multi-stage grinding mechanism (2) and a vibrating screening mechanism (3); the base (1) is equipped with a multi-stage grinding mechanism (2) for grinding materials; the multi-stage grinding mechanism (2) consists of a first grinding roller (211) at the left end, a tail grinding roller (213) at the right end, and several intermediate grinding rollers (212) located between the first grinding roller (211) and the tail grinding roller (213); the right end of the first grinding roller (211) and the left end of the intermediate grinding roller (212) are connected. The roller connecting assembly (22) is detachably connected. The left end of the tail grinding roller (213) and the right end of the middle grinding roller (212) are detachably connected through the roller connecting assembly (22). Adjacent middle grinding rollers (212) are detachably connected through the roller connecting assembly (22). The left end of the first grinding roller (211) and the right end of the tail grinding roller (213) are rotatably connected to the base (1). The base (1) is equipped with a vibrating screening mechanism (3) for screening the ground material.

2. The pulverizing device for graded grinding according to claim 1, characterized in that, The first grinding roller (211), the right-end tail grinding roller (213), and the middle grinding roller (212) are also equipped with a water-cooling component (23) and a water-cooling connection component (24); the base (1) and the water-cooling connection component (24) are both connected to the water-cooling component (23); the water-cooling component (23) is used to cool down the first grinding roller (211), the right-end tail grinding roller (213), and the middle grinding roller (212), and the water-cooling connection component (24) is used to connect the multi-stage water-cooling component (23); the left end of the first grinding roller (211) is provided with a feed inlet (214); the right end of the tail grinding roller (213) is provided with a discharge outlet (215); the inside of the first grinding roller (211), the middle grinding roller (212), and the tail grinding roller (213) are all fixedly connected with an inner liner plate (216) by screws.

3. The pulverizing apparatus for graded grinding according to claim 1, characterized in that, The roller connecting assembly (22) includes a lower clamping ring (221), an upper clamping ring (222), a rotating shaft (223), a screw (225), and a retaining tooth (226); the right ends of the first grinding roller (211) and the middle grinding roller (212) are fixedly connected to the lower clamping ring (221), the rear end of the lower clamping ring (221) is fixedly connected to the rotating shaft (223), and the upper clamping ring (222) is rotatably connected to the rotating shaft (223); the lower clamping ring (221) and the upper clamping ring (222) are fixedly connected to the rotating shaft (223); The front end of each of the first grinding roller (222) is provided with a screw hole (224); the screw hole (224) is threadedly connected to the screw (225); the right end of the first grinding roller (211), the left and right ends of the middle grinding roller (212) and the left end of the tail grinding roller (213) are all arranged with multiple teeth (226) in a circular array; the right end of the first grinding roller (211), the left and right ends of the middle grinding roller (212) and the left end of the tail grinding roller (213) are all fixedly connected to the teeth (226).

4. The pulverizing apparatus for graded grinding according to claim 2, characterized in that, The water-cooling assembly (23) includes an inlet slip ring (233) and an outlet slip ring (234); cold water pipes are provided in the first section grinding roller (211), the right end tail section grinding roller (213), and the middle section grinding roller (212); the stator of the inlet slip ring (233) is fixedly connected to the base (1); the rotor of the inlet slip ring (233) is fixedly connected to the first section grinding roller (211); the stator of the outlet slip ring (234) is fixedly connected to the base (1). The rotor of the outlet slip ring (234) is fixedly connected to the tail grinding roller (213); the inlet slip ring (233) has an inlet (231) and the outlet slip ring (234) has an outlet (232); the rotors of the inlet slip ring (233) and the outlet slip ring (234) are respectively connected to the inlet end and outlet end of the cold water pipe; all the cold water pipes are connected by flexible hoses and water-cooled connection assembly (24) to form a water-cooled circulation system.

5. The pulverizing apparatus for graded grinding according to claim 4, characterized in that, The water-cooled connection assembly (24) includes a connection socket assembly and a connection interface assembly. The connection socket assembly is connected to the upper right side of the first grinding roller (211) and the middle grinding roller (212). The connection interface assembly is connected to the upper left side of the middle grinding roller (212) and the tail grinding roller (213). The connection socket assembly is connected to the connection interface assembly.

6. The pulverizing apparatus for graded grinding according to claim 5, characterized in that, The connection socket assembly includes a rotating ring (241), a first biting block (242), and a first abutting block (243). The rotating ring (241) is rotatably connected to the water cooling pipe. Multiple first biting blocks (242) are arranged in a circumferential array and fixedly installed on the right end of the rotating ring (241). The inner sidewall of the first biting block (242) is fixedly connected to the first abutting block (243). The upper end of the first biting block (242) is provided with a second screw hole (244).

7. The pulverizing apparatus for graded grinding according to claim 6, characterized in that, The connection interface assembly includes a second biting block (245) and a second clamping block (246). Multiple second biting blocks (245) are arranged in a circumferential array and fixedly installed on the upper left side of the middle grinding roller (212) and the tail grinding roller (213). The second clamping block (246) is fixedly installed on the inner side wall of the second biting block (245). The second screw hole (244) is opened on the outer side wall of the second clamping block (246). A sealing ring is fixedly installed on the side wall of the second clamping block (246) away from the second biting block (245). The second screw (247) is threadedly connected to the first biting block (242) and the second biting block (245) through the second screw hole (244).

8. The pulverizing apparatus for graded grinding according to claim 7, characterized in that, The vibration screening mechanism (3) includes a screening component (31) and a limiting component (32). The screening component (31) is connected to the tail grinding roller (213); the screening component (31) is connected to the base (1); the limiting component (32) is connected to the screening component (31); the screening component (31) is used to screen the ground product; the limiting component (32) is used to limit the screening component (31).

9. The pulverizing apparatus for graded grinding according to claim 8, characterized in that, The screening component (31) includes a cam (311), a housing (312), and a screen (313); the cam (311) is fixedly connected to the right end of the tail grinding roller (213), the cam (311) abuts against the upper end of the screen (313), and both the screen (313) and the housing (312) are connected to the limiting component (32).

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