Cutting device for excess materials generated after injection molding of automobile injection molding part

Abstract

The invention relates to the technical field of automobile injection molding parts, in particular to an automobile injection molding part excess material cutting device which comprises a workbench, a working frame is arranged above the workbench, the four corners of the bottom of the working frame are connected with the four corners of the workbench, and a driving assembly is arranged on the workbench. The driving assembly is provided with a laminating device and is located on the working frame, the side end of the laminating device is provided with a moving assembly, the moving assembly is provided with a cutting assembly, and the laminating device comprises a fixing assembly and a changing assembly. Through work of the attaching device and the cutting assembly, the cutting path can be automatically adjusted according to the shape of the injection molding part, meanwhile, the cutting knife is controlled to automatically cut along the track, and the cutting quality and the cutting efficiency are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of automotive injection molding technology, specifically to a device for cutting off excess material after injection molding of automotive injection molded parts. Background Technology

[0002] In the automotive manufacturing industry, injection molded parts are used as key components in automotive interiors, exteriors, and various functional components.

[0003] In existing technologies, after injection molding of a workpiece, it is usually necessary to remove excess material along the surface of the workpiece. This typically requires workers to use hand-held cutting tools, making the cutting accuracy heavily dependent on the experience and skill level of the workers. This is inefficient and makes it difficult to ensure the consistency of each injection molded part, resulting in insufficient cutting quality. Furthermore, when cutting injection molded parts with complex shapes, it is difficult to flexibly adjust the cutting path, leading to low cutting efficiency. Therefore, there is a need for a device that can automatically adjust the cutting path according to the shape of the injection molded part while controlling the cutting blade to automatically cut along the trajectory, in order to avoid insufficient cutting quality and low cutting efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a device for cutting excess material after injection molding of automotive injection molded parts, so as to solve the problems mentioned in the background art. To achieve the above objective, this invention provides the following technical solution: A device for cutting excess material after injection molding of automotive injection molded parts, including a worktable, a work frame above the worktable, the four corners of the bottom of the work frame connected to the four corners of the worktable, a driving assembly on the worktable, a bonding device on the driving assembly and located on the work frame, a moving assembly on the side of the bonding device, a cutting assembly on the moving assembly, the bonding device including a fixing assembly and a changing assembly, the fixing assembly being disposed on the work frame, and the changing assembly being disposed on the side of the fixing assembly.

[0005] Preferably, the driving assembly includes a driving gear rotatably disposed at the center of the worktable, a driving motor disposed at the bottom of the worktable, the output end of the driving motor being connected to the center of the driving gear, driving toothed rods symmetrically meshing on both sides of the driving gear, the two driving toothed rods being arranged in mirror image with respect to the driving gear, a connecting post being disposed at the top of the end of each driving toothed rod away from the driving gear, the top of the connecting post being slidably disposed in a mating groove on the work frame and connected to the bottom of the sliding table, the sliding table being slidably disposed on the work frame.

[0006] Preferably, the fixing component includes a clamping platform fixed to the sliding table. A semi-circular groove is formed on the side of the two clamping platforms that are close to each other. A semi-circular platform is rotatably connected in the semi-circular groove. A plurality of auxiliary arc-shaped platforms are evenly distributed on the side of the semi-circular platform away from the semi-circular groove. The plurality of auxiliary arc-shaped platforms are rotatably connected to the semi-circular platform. A plurality of snap-fit ​​arc-shaped platforms are evenly distributed on the side of the auxiliary arc-shaped platforms away from the semi-circular platform. The plurality of snap-fit ​​arc-shaped platforms are rotatably connected to the auxiliary arc-shaped platforms. A plurality of elastic elements are evenly distributed on the side of the snap-fit ​​arc-shaped platforms away from the auxiliary arc-shaped platforms. The middle part of the plurality of elastic elements is rotatably connected to the snap-fit ​​arc-shaped platforms through a rotating shaft.

[0007] Preferably, the variable assembly includes variable frames symmetrically arranged on both sides of the sliding table, a receiving frame above the sliding table, and the bottom ends of the receiving frames connected to the top of a variable frame respectively. The variable frames and the working frame are slidably engaged. Several rotating frames are provided on the side of the receiving frame near the rotating shaft. The top of the rotating shaft passes through the top of the rotating frames and is rotatably engaged with them. The top of the rotating shaft is connected to the end of a hinge frame respectively. The connection points of the hinge frames on each pair of adjacent rotating shafts are opposite to those of the rotating shafts. Two oppositely arranged hinge frames form a group. Each group of hinge frames is staggered in height. Each hinge frame is provided with an L-shaped connecting frame. The tops of several L-shaped connecting frames are located on the same parallel line. Each pair of L-shaped connecting frames is movably connected by a hinge. An L-shaped support frame is provided at the top of each end of the receiving frame. The side ends of the two L-shaped support frames are movably connected to the side ends of the L-shaped connecting frames located at the ends by hinges respectively.

[0008] Preferably, the movable component includes a first sliding groove formed on the top of a plurality of L-shaped connecting frames and hinges, the two ends of the first sliding groove extending through to the top of the L-shaped support frames on both sides, and a second sliding groove formed on the side ends of the plurality of L-shaped connecting frames and hinges, the two ends of the second sliding groove extending through to the side ends of the L-shaped support frames on both sides, and an L-shaped drive frame slidably mounted on one of the L-shaped support frames.

[0009] Preferably, a linkage shaft is rotatably provided on the L-shaped drive frame. The bottom of the linkage shaft is located in the first sliding groove and connected to the center of the first rolling wheel. The side end of the first rolling wheel abuts against the inner wall of the first sliding groove. A second rolling wheel is rotatably provided on the side end of the L-shaped drive frame. The second rolling wheel is located in the second sliding groove and abuts against its inner wall.

[0010] Preferably, the cutting assembly includes a cutting table disposed on the top of the work frame, an electric push rod disposed on the top of the cutting table, the output end of the electric push rod being connected to the side end of the drive plate, the two ends of the drive plate being respectively connected to the side ends of adjacent L-shaped drive frames, the two ends of the drive plate being retractable, a laser cutting machine disposed at the bottom of the side end of the L-shaped drive frame, a grinding component disposed at the side end of the laser cutting machine, the center of the grinding component being rotatably connected to the L-shaped drive frame via a vertical transmission shaft, a transmission belt being sleeved on the top outer side of the transmission shaft, and the other end of the transmission belt being sleeved on the outer side of the linkage shaft.

[0011] Preferably, the grinding element has a multi-leaf structure and the side ends of the grinding element are arc-shaped.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: In this invention, the device operates by controlling the drive component, which in turn drives the fixing component to clamp and fix the workpiece from both sides. During the fixing process, the changing component adjusts the cutting path in real time to match the outer shape of the workpiece. Subsequently, the moving component is controlled to move the cutting component along the path of the changing component, thereby cutting off the excess material on the surface of the workpiece. After cutting, the surface is polished. This process avoids the need for workers to manually hold the cutting tool, ensuring consistency in the cutting of injection molded parts and improving cutting quality. It can also adapt to injection molded parts of different shapes, automatically forming a cutting path that matches the shape of the injection molded part after each fixing, greatly improving cutting efficiency. Thus, it can automatically adjust the cutting path according to the shape of the injection molded part while controlling the cutting blade to automatically cut along the trajectory, avoiding insufficient cutting quality and low cutting efficiency.

[0013] In this invention, by using the drive assembly and bonding device in combination, several elastic elements abut against the workpiece contour, thereby driving several hinge frames to deflect. Under the action of the hinges, several L-shaped connecting frames form a cutting path that matches the workpiece contour, thus adapting to injection molded parts of different shapes. After each injection molded part is fixed, the cutting path automatically forms a cutting path that matches it, greatly improving the cutting efficiency.

[0014] In this invention, the stability during movement is further increased by the coordinated use of components such as stabilizing components, ensuring the safety of workers standing on the receiving platform, reducing the impact of the moving base on workers during movement, preventing workers from losing their center of gravity during movement, and thus improving the practicality of the device.

[0015] In this invention, the L-shaped drive frame can move along the contour of the workpiece by using components such as the moving component and the cutting component. This facilitates the cutting of excess material by the laser cutting machine. During the movement, the cut surface is polished, thus avoiding the need for workers to hold the cutting tool by hand. This ensures the consistency of the injection molded parts during cutting, improves the cutting quality, and polishes the cut area simultaneously, ensuring the smoothness of the cut surface of the workpiece.

[0016] In this invention, the multi-leaf structure design ensures that the grinding workpiece always adheres to the surface for polishing when it faces the corner of the workpiece contour, thereby improving the practicality of the device. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the partial explosion three-dimensional structure of the present invention; Figure 3 This is a partial three-dimensional structural diagram of the present invention. Figure 1 ; Figure 4 This is a partial three-dimensional structural diagram of the present invention. Figure 2 ; Figure 5 This is a partial three-dimensional structural diagram of the bonding device in this invention. Figure 1 ; Figure 6 This is a partial three-dimensional structural diagram of the bonding device in this invention. Figure 2 ; Figure 7 for Figure 6 Enlarged view of region A in the middle; Figure 8 This is a partial three-dimensional structural diagram of the variable component in this invention; Figure 9 This is a partial three-dimensional structural diagram of the moving component and the cutting component in this invention. Figure 1 ; Figure 10 This is a partial three-dimensional structural diagram of the moving component and the cutting component in this invention. Figure 2 ; Figure 11 This is a partial three-dimensional structural diagram of the cutting component in this invention.

[0018] In the diagram: 1. Workbench; 2. Work frame; 3. Drive assembly; 31. Drive gear; 32. Drive motor; 33. Drive toothed rod; 34. Connecting column; 35. Mating groove; 36. Sliding table; 4. Fitting device; 41. Fixing assembly; 411. Clamping table; 412. Semi-arc groove; 413. Semi-arc table; 414. Auxiliary arc table; 415. Snap-fit ​​arc table; 416. Elastic element; 417. Rotating shaft; 42. Variation assembly; 421. Variation frame; 422. Bearing 423. Connecting frame; 424. Rotating frame; 425. Hinge frame; 426. L-shaped connecting frame; 427. Hinge; 428. L-shaped support frame; 5. Moving component; 51. First sliding groove; 52. Second sliding groove; 53. L-shaped drive frame; 54. Linkage shaft; 55. First rolling wheel; 56. Second rolling wheel; 6. Cutting component; 61. Cutting table; 62. Electric push rod; 63. Drive plate; 64. Laser cutting machine; 65. Grinding part; 66. Drive shaft; 67. Drive belt. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figures 1 to 11 This invention provides a technical solution: a device for cutting residual material after injection molding of automotive injection molded parts, including a worktable 1, a work frame 2 above the worktable 1, the four corners of the bottom of the work frame 2 being connected to the four corners of the worktable 1, a drive assembly 3 on the worktable 1, a bonding device 4 on the drive assembly 3 and located on the work frame 2, a moving assembly 5 on the side of the bonding device 4, a cutting assembly 6 on the moving assembly 5, and the bonding device 4 including a fixing assembly 41 and a changing assembly 42, the fixing assembly 41 being disposed on the work frame 2, and the changing assembly 42 being disposed on the side of the fixing assembly 41.

[0021] In this embodiment, as Figures 1 to 8As shown, the drive assembly 3 includes a drive gear 31 rotatably disposed at the center of the workbench 1. A drive motor 32 is provided at the bottom of the workbench 1. The output end of the drive motor 32 is connected to the center of the drive gear 31. Drive toothed rods 33 are symmetrically meshed on both sides of the drive gear 31. The two drive toothed rods 33 are arranged in mirror image with the drive gear 31 as the center. A connecting post 34 is provided at the top of the end of each drive toothed rod 33 away from the drive gear 31. The top of the connecting post 34 is slidably disposed in a mating groove 35 on the work frame 2 and connected to the bottom of the sliding table 36. The sliding table 36 is slidably disposed on the work frame 2. The fixing assembly 41 includes a clamping platform 411 fixed on the sliding table 36. A semi-arc groove 412 is provided on the side of the two clamping platforms 411 that are close to each other. A semi-arc platform 413 is rotatably connected in the semi-arc groove 412. A plurality of auxiliary arc platforms 414 are evenly distributed on the side of the semi-arc platform 413 away from the semi-arc groove 412. The plurality of auxiliary arc platforms 414 are rotatably connected to the semi-arc platform 413. A plurality of snap-fit ​​arc platforms 415 are evenly distributed on the side of the auxiliary arc platforms 414 away from the semi-arc platform 413. The plurality of snap-fit ​​arc platforms 415 are rotatably connected to the auxiliary arc platforms 414. A plurality of elastic elements 416 are evenly distributed on the side of the snap-fit ​​arc platforms 415 away from the auxiliary arc platforms 414. The middle part of the plurality of elastic elements 416 is rotatably connected to the snap-fit ​​arc platforms 415 through a rotating shaft 417. The variable assembly 42 includes variable frames 421 symmetrically arranged on both sides of the sliding table 36. A receiving frame 422 is provided above the sliding table 36. The bottom ends of the receiving frame 422 are respectively connected to the top of a variable frame 421. The variable frame 421 is slidably engaged with the working frame 2. Several rotating frames 423 are provided on the side of the receiving frame 422 near the rotating shaft 417. The top of the rotating shaft 417 passes through the top of the rotating frame 423 and is rotatably engaged with it. The top of the rotating shaft 417 is respectively connected to the end of a hinge frame 424. The hinge frames 424 on each pair of adjacent rotating shafts 417 are... 4. The connection points with the rotating shaft 417 are arranged in opposite directions. Two hinge frames 424 arranged in opposite directions form a group. Each group of hinge frames 424 is arranged at different heights. Each hinge frame 424 is provided with an L-shaped connecting frame 425. The tops of several L-shaped connecting frames 425 are located on the same parallel line. Every two L-shaped connecting frames 425 are movably connected by a hinge 426. Each end of the support frame 422 is provided with an L-shaped support frame 427. The side ends of the two L-shaped support frames 427 are movably connected to the side ends of the L-shaped connecting frames 425 located at both ends by hinges 426.

[0022] In this embodiment, as Figures 9 to 11As shown, the movable component 5 includes a first sliding groove 51 formed on the top of a plurality of L-shaped connecting frames 425 and hinges 426. The two ends of the first sliding groove 51 extend through to the top of the L-shaped support frames 427 on both sides. The sides of the plurality of L-shaped connecting frames 425 and hinges 426 are provided with second sliding grooves 52. The two ends of the second sliding grooves 52 extend through to the sides of the L-shaped support frames 427 on both sides. An L-shaped drive frame 53 is slidably provided on one of the L-shaped support frames 427. The L-shaped drive frame 53 is rotatably provided with a linkage shaft 54. The bottom of the linkage shaft 54 ​​is located in the first sliding groove 51 and connected to the center of the first rolling wheel 55. The side end of the first rolling wheel 55 abuts against the inner wall of the first sliding groove 51. The side end of the L-shaped drive frame 53 is rotatably provided with a second rolling wheel 56. The second rolling wheel 56 is located in the second sliding groove 52 and abuts against its inner wall. The cutting assembly 6 includes a cutting table 61 mounted on top of the work frame 2. An electric push rod 62 is mounted on top of the cutting table 61. The output end of the electric push rod 62 is connected to the side end of a drive plate 63. Both ends of the drive plate 63 are connected to the side ends of adjacent L-shaped drive frames 53. Both ends of the drive plate 63 are retractable. A laser cutting machine 64 is mounted at the bottom of the side end of the L-shaped drive frame 53. A grinding component 65 is mounted on the side end of the laser cutting machine 64. The center of the grinding component 65 is rotatably connected to the L-shaped drive frame 53 via a vertical transmission shaft 66. A transmission belt 67 is sleeved on the outer side of the top of the transmission shaft 66, and the other end of the transmission belt 67 is sleeved on the outer side of the linkage shaft 54.

[0023] In this embodiment, as Figure 10 As shown, the grinding component 65 has a multi-leaf structure, and the side end of the grinding component 65 is arc-shaped.

[0024] The invention provides the following usage method and advantages: A device for cutting excess material after injection molding of automotive injection molded parts, the working process of which is as follows: like Figures 1 to 11As shown, the operator places the workpiece between two clamping tables 411, and then controls the drive motor 32 to rotate the drive gear 31, causing the two drive gear rods 33 to move closer to each other. Through the cooperation of the connecting column 34 and the mating groove 35, the two sliding tables 36 are driven to move closer to each other, thereby causing several elastic elements 416 to move and abut against the workpiece surface. During the contact process, the contour of the workpiece surface abuts against the workpiece, causing the elastic elements 416 to rotate under the action of the rotating shaft 417. And through the engagement of the arc-shaped table 415 and the auxiliary arc-shaped table 414, the workpiece adapts to the action of the semi-arc table 413, and then... Several elastic elements 416 are adaptively deflected, causing them to abut against the workpiece contour. This drives each rotating shaft 417 to change its angle on the rotating frame 423, which in turn causes several hinge frames 424 to deflect. Under the action of the hinge 426, several L-shaped connecting frames 425 deflect between two L-shaped support frames 427, thus facilitating the formation of a cutting path that matches the workpiece contour. This allows the system to adapt to injection molded parts of different shapes, and the cutting path automatically forms a matching cutting path after each injection molded part is fixed, greatly improving cutting efficiency. Once the cutting path is formed, the electric push rod 62 operates, thereby driving the drive plate 63 and the L-shaped drive frames 53 at both ends to reciprocate once. Then, the L-shaped drive frames 53 slide in the changed first sliding groove 51 and second sliding groove 52 through the first rolling wheel 55 and the second rolling wheel 56, so that the L-shaped drive frames 53 can move along the contour of the workpiece, which facilitates the cutting of the excess material by the laser cutting machine 64. During the movement, the first rolling wheel 55 rolls in the first sliding groove 51, and under the action of the transmission belt 67 and the linkage shaft 54, the grinding part 65 works through the transmission shaft 66 to polish the cut surface, thereby avoiding the need for the operator to cut with a cutting tool, ensuring the consistency of the injection molded parts cutting, improving the cutting quality, and simultaneously polishing the cut area to ensure the smoothness of the workpiece cut surface. The multi-leaf structure design ensures that the grinding part 65 faces the corner of the workpiece contour, thus improving the practicality of the device.

[0025] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for cutting residual material after injection molding of automotive injection molded parts, comprising a worktable (1), a work frame (2) above the worktable (1), and the four corners of the bottom of the work frame (2) being connected to the four corners of the worktable (1); Its features are: The workbench (1) is provided with a drive assembly (3), the drive assembly (3) is provided with a bonding device (4) and located on the work frame (2), the side end of the bonding device (4) is provided with a moving assembly (5), the moving assembly (5) is provided with a cutting assembly (6), the bonding device (4) includes a fixed assembly (41) and a changing assembly (42), the fixed assembly (41) is provided on the work frame (2), and the changing assembly (42) is provided on the side end of the fixed assembly (41).

2. The device for cutting excess material after injection molding of automotive injection molded parts according to claim 1, characterized in that: The drive assembly (3) includes a drive gear (31) that is rotatably disposed at the center of the worktable (1). The bottom of the workbench (1) is provided with a drive motor (32), and the output end of the drive motor (32) is connected to the center of the drive gear (31); The drive gear (31) has drive toothed rods (33) symmetrically meshing on both sides, and the two drive toothed rods (33) are arranged in a mirror image with the drive gear (31) as the center. Each of the drive gear rods (33) has a connecting post (34) at the top of the end away from the drive gear (31). The top of the connecting post (34) is slidably disposed in the mating groove (35) on the work frame (2) and connected to the bottom of the sliding table (36). The sliding table (36) is slidably mounted on the work frame (2).

3. The device for cutting excess material after injection molding of automotive injection molded parts according to claim 2, characterized in that: The fixing component (41) includes a gripping platform (411) fixed on the sliding table (36), and a semi-circular groove (412) is provided on the side of the two gripping platforms (411) that are close to each other. A semi-arc platform (413) is rotatably connected inside the semi-arc groove (412), and a number of auxiliary arc platforms (414) are evenly distributed on the side of the semi-arc platform (413) away from the semi-arc groove (412). The auxiliary arc-shaped platform (414) has several snap-fit ​​arc-shaped platforms (415) evenly distributed on the side away from the semi-arc platform (413). The snap-fit ​​arc-shaped platform (415) has a number of elastic elements (416) evenly distributed on the side away from the auxiliary arc-shaped platform (414). The middle portions of several elastic elements (416) are rotatably connected to the snap-fit ​​arc-shaped platform (415) via a rotating shaft (417).

4. The device for cutting excess material after injection molding of automotive injection molded parts according to claim 3, characterized in that: The variable component (42) includes variable frames (421) symmetrically arranged on both sides of the sliding table (36), and a receiving frame (422) is provided above the sliding table (36). The bottom ends of the receiving frame (422) are respectively connected to the top of a variable frame (421). The receiving frame (422) has several rotating frames (423) on the side near the rotating shaft (417). The top of the rotating shaft (417) passes through the top of the rotating frame (423) and rotates in cooperation with it. The top of the rotating shaft (417) is connected to the end of a hinge frame (424); The hinge brackets (424) on each pair of adjacent rotating shafts (417) are arranged opposite to the connection points of the rotating shafts (417); Two hinge frames (424) arranged opposite to each other form a group, and the hinge frames (424) in each group are arranged in a staggered manner at different heights; Each of the hinge frames (424) is provided with an L-shaped connecting frame (425), and the tops of several L-shaped connecting frames (425) are located on the same parallel line; Each pair of L-shaped connecting frames (425) is movably connected by a hinge (426); The top of each end of the receiving frame (422) is provided with an L-shaped support frame (427), and the side ends of the two L-shaped support frames (427) are respectively connected to the side ends of the L-shaped connecting frame (425) located at both ends by hinges (426).

5. The device for cutting excess material after injection molding of automotive injection molded parts according to claim 4, characterized in that: The moving component (5) includes a first sliding groove (51) formed on the top of a plurality of L-shaped connecting frames (425) and hinges (426); The two ends of the first sliding groove (51) extend through to the top of the L-shaped support frame (427) on both sides; A second sliding groove (52) is provided on the side end of several of the L-shaped connecting brackets (425) and hinges (426); The two ends of the second sliding groove (52) extend through to the sides of the L-shaped support frame (427); An L-shaped drive frame (53) is slidably mounted on one of the L-shaped support frames (427).

6. The device for cutting excess material after injection molding of automotive injection molded parts according to claim 5, characterized in that: The L-shaped drive frame (53) is rotatably provided with a linkage shaft (54), the bottom of which is located in the first sliding groove (51) and connected to the center of the first rolling wheel (55); The side end of the first roller (55) abuts against the inner wall of the first sliding groove (51), and the side end of the L-shaped drive frame (53) is rotatably provided with a second roller (56), which is located in the second sliding groove (52) and abuts against its inner wall.

7. The device for cutting excess material after injection molding of automotive injection molded parts according to claim 6, characterized in that: The cutting assembly (6) includes a cutting table (61) disposed on top of the work frame (2), and an electric push rod (62) is provided on top of the cutting table (61). The output end of the electric push rod (62) is connected to the side end of the drive plate (63), and the two ends of the drive plate (63) are respectively connected to the side ends of the adjacent L-shaped drive frame (53). The two ends of the drive board (63) are retractable; A laser cutter (64) is provided at the bottom of the side end of the L-shaped drive frame (53). The laser cutting machine (64) is provided with a grinding part (65) on its side. The center of the grinding part (65) is rotatably connected to the L-shaped drive frame (53) via a vertical drive shaft (66); A transmission belt (67) is fitted on the top outer side of the transmission shaft (66), and the other end of the transmission belt (67) is fitted on the outside of the linkage shaft (54).

8. The device for cutting excess material after injection molding of automotive injection molded parts according to claim 7, characterized in that: The grinding component (65) has a multi-leaf structure, and the side ends of the grinding component (65) are arc-shaped.

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