A grinding machine

Abstract

The present application relates to the technical field of grinding equipment, and in particular to a grinder, which includes a grinder body and a grinding assembly arranged in the grinder body, the grinding assembly includes a rotating shaft rotatably connected to the grinder body, a fixed disk fixed on the rotating shaft, a mounting shaft fixed on the fixed disk, and a grinding hammer rotatably connected to the mounting shaft, a filter screen is arranged in the grinder body, the filter screen includes a screening part, an arc-shaped part and a connecting part, the arc-shaped part and the connecting part are both provided with filter holes, and the size is the same as the filter holes on the screening part, the diameter of the screening part is smaller than the diameter of the arc-shaped part, and the screening part and the arc-shaped part are coaxially arranged, one end of the connecting part is fixed on the arc-shaped part, and the other end is fixed on the screening part. The present application has the effect of reducing the continuous grinding of materials that meet the requirements in the grinder body.

Description

Technical Field

[0001] The present application relates to the technical field of grinding equipment, and in particular to a grinding machine. Background Art

[0002] During the production process, agricultural products are ground and crushed according to actual needs to produce the required particle size. Hammer crushers are indispensable in the grinding and crushing process. The working principle is mainly to use high-speed rotating hammers to impact, collide, grind and squeeze the materials, thereby achieving grinding and crushing of the materials.

[0003] For example, the Chinese patent document with the announcement number CN221433255U discloses a hammer crusher, including a table body, a fixed plate fixedly installed on the top of the table body, a device body fixedly installed on the inner side of the fixed plate, a feed port fixedly installed on the right side of the device body, a discharge port fixedly installed at the bottom of the feed port, an adjustment mechanism arranged inside the device body, and a knocking mechanism arranged inside the device body; the adjustment mechanism includes a crushing assembly and a rotating assembly, and the rotating assembly is arranged outside the crushing assembly. During use, the crushing assembly is used to make the hammer head rotate outside the connecting rod to strike the material, causing the material to be crushed, and the material that meets the requirements passes through the filter screen and is then discharged from the discharge port, and finally ground and crushed into the required particle size.

[0004] In the above-mentioned related technologies, after the material enters the grinder body from the feed inlet, it contacts the rotating hammer head. After the material contacts the hammer head, it will be hit on the filter screen by the hammer head, and then the material that meets the requirements for the first time will pass through the filter screen, and the material that does not meet the requirements will rebound on the hammer head, and then the material will continue to be beaten and ground under the action of the hammer head. During the first beating of the material, some materials that meet the requirements will hit the edges of the filter screen, and then rebound on the hammer head. The hammer head continues to hit the filter screen. At this time, part of the material will continue to be crushed and ground, and finally it will be ground into finer unqualified materials. On the one hand, it will cause the grinding efficiency of the grinder to decrease, and on the other hand, the unqualified grinding rate of the material will increase in the subsequent screening process. Summary of the invention

[0005] The present application provides a grinder, aiming to solve the problem in the related art that materials that meet the requirements and hit the edge of the filter screen are continuously ground.

[0006] The present application provides a grinding machine adopting the following technical solution:

[0007] A grinder comprises a grinder body and a grinding assembly arranged in the grinder body, wherein the grinding assembly comprises a rotating shaft rotatably connected to the grinder body, a fixed disk fixed on the rotating shaft, a mounting shaft fixed on the fixed disk, and a grinding hammer rotatably connected to the mounting shaft, wherein a filter screen is arranged in the grinder body, wherein the filter screen comprises a screening part, an arc-shaped part and a connecting part, wherein the arc-shaped part and the connecting part are both provided with filtering holes, and the size of the filtering holes is the same as that of the filtering holes on the screening part, the diameter of the screening part is smaller than the diameter of the arc-shaped part, and the screening part and the arc-shaped part are coaxially arranged, one end of the connecting part is fixed on the arc-shaped part, and the other end is fixed on the screening part; a baffle plate for contacting rebounded materials is arranged in the grinder body, and the baffle plate is arranged in an arc-shaped structure; a material raising assembly for raising materials falling on the baffle plate is arranged between the baffle plate and the arc-shaped part, and a blowing assembly for blowing the raised materials to the arc-shaped part and the connecting part is arranged on the material raising assembly.

[0008] By adopting the above technical scheme, the material falling from the feed inlet enters the grinder body, and then the material will be hit on the filter screen during the swinging process of the grinding hammer, and the material that meets the requirements will be discharged from the mesh holes on the filter screen, and then hit the edge of the filter screen and the material that meets the requirements and large particles will rebound. In the process of rebounding, affected by gravity, large particles and some materials that meet the requirements will hit the baffle plate, and then fall along the baffle plate to between the grinding hammer and the screening part, avoiding the material that hits the edge of the filter screen and meets the requirements from directly contacting the grinding hammer after rebounding, thereby reducing the direct beating of the material that hits the edge of the filter screen and meets the requirements, and then avoiding a part of the material from being ground finer, resulting in an increase in the material that does not meet the requirements.

[0009] Optionally, the material lifting assembly includes a mounting plate fixedly mounted on the grinding machine body, a material lifting shaft rotatably connected to the mounting plate, and a plurality of material lifting plates fixed on the material lifting shaft; each of the material lifting plates is provided with a sealing assembly for sealing between the material lifting plate and the baffle.

[0010] By adopting the above technical solution, when the rebounded material falls to the lifting plate, the lifting shaft rotates to drive the four lifting plates to rotate, and the lifting plate with the material rotates to an inclined state. At this time, the material will fall under the action of gravity. In the process of falling material, the material will be blown to the arc part, the connecting part and the screening part under the action of the blowing component. The material that meets the requirements directly passes through the filter screen, and then the continuous grinding of the material that meets the requirements in the grinder body can be reduced, thereby reducing the occurrence of smaller particles in the ground material.

[0011] Optionally, the blocking assembly includes a blocking plate slidably connected to the material lifting plate and a blocking spring fixed to the blocking plate, wherein one end of the blocking spring away from the blocking plate is fixed to the material lifting plate, and the blocking spring pushes the blocking plate to move in a direction away from the material lifting plate.

[0012] By adopting the above technical solution, the blocking plate can be abutted against the surface of the baffle plate under the action of the blocking spring, thereby achieving the purpose of blocking.

[0013] Optionally, one end of the blocking plate away from the lifting plate is rotatably connected to an abutment roller for contacting the surface of the baffle plate.

[0014] By adopting the above technical solution, the abutting roller is used to contact the surface of the baffle plate, so that the friction between the blocking plate and the baffle plate can be reduced when the lifting plate rotates.

[0015] Optionally, the blowing assembly includes a blowing pipe fixed on the grinder body, a fan arranged on the ground, and a connecting pipe for connecting the fan and the blowing pipe, the blowing pipe is provided with a blowing port, the blowing port is arranged toward the arc-shaped portion and the connecting portion, and the lifting shaft is provided with a clearance groove for facilitating the passage of wind.

[0016] By adopting the above technical solution, when the lifting shaft drives the lifting plate to rotate, the give way groove will correspond to the blowing port. At this time, the gas blown out through the blowing port can make the material move in the direction close to the arc part and the connecting part. The material with particles that meet the requirements is light in weight, and then it will pass through the arc part and the connecting part to achieve the purpose of separation, thereby reducing the further grinding and crushing of the material that meets the requirements.

[0017] Optionally, a filter plate for blocking materials is installed on the air outlet.

[0018] By adopting the above technical solution, the filter plate can prevent the material from entering the blowing pipe through the blowing port.

[0019] Optionally, the grinding machine body is provided with a control component for driving the blocking plate on the material lifting plate to move in a direction close to the material lifting axis, and a guiding surface is provided on the baffle.

[0020] By adopting the above technical solution, the control component can drive the sealing plate on the lifting plate to move towards the lifting shaft, so that the sealing plate moves into the lifting plate, and then the lifting shaft is rotated so that the abutment roller abuts against the baffle plate, thereby better achieving the sealing effect. On the other hand, it can prevent the sealing plate and the grinding hammer from colliding.

[0021] Optionally, the control assembly includes a control rod fixed on the blocking plate, a control sleeve slidably connected to the control rod, and a control spring fixed on the control sleeve, and the mounting plate is provided with a control groove for plugging the control sleeve.

[0022] By adopting the above technical solution, when the lifting plate drives the sealing plate to rotate, the control sleeve can be pushed to move in the direction close to the lifting shaft under the action of the control groove, thereby moving the sealing plate into the lifting plate. On the one hand, it prevents the extended sealing plate and the grinding hammer from intersecting and colliding, and on the other hand, it can facilitate the abutment between the abutment roller and the baffle surface.

[0023] Optionally, the control groove includes a limit groove and a guide groove, the limit groove is opened along the circumference of the mounting plate, one end of the guide groove is connected to the limit groove, and the depth of the limit groove is the same as the depth of the guide groove, and a guide part is provided at one end of the guide groove away from the limit groove, and an inner wall of the guide part is provided with an inclined surface.

[0024] By adopting the above technical solution, during the rotation of the lifting plate, the control sleeve abutting against the surface of the mounting plate moves into the guide groove through the inclined surface, and then moves into the limit groove through the guide groove. When the control sleeve is in the limit groove, the position of the blocking plate is fixed. At this time, when the blocking plate rotates toward the baffle, it will not hit the rotating grinding hammer, which makes it more convenient to use.

[0025] Optionally, a guiding portion is also provided at one end of the limiting groove away from the guiding groove, and an inclined surface is provided at the bottom of the guiding portion.

[0026] By adopting the above technical solution, during the rotation of the lifting plate, the control sleeve can be separated from the limiting groove through the inclined surface from the limiting groove, and then the blocking plate is pushed to move away from the lifting axis under the action of the blocking spring.

[0027] In summary, the present application includes at least one of the following beneficial effects:

[0028] 1. The materials that meet the requirements and large particles that hit the edge of the filter will rebound. During the rebound process, affected by gravity, large particles and some materials that meet the requirements will hit the baffle, and then fall along the baffle to between the grinding hammer and the screening part, avoiding the materials that hit the edge of the filter and meet the requirements from directly contacting the grinding hammer after rebounding.

[0029] 2. During the falling process of the material, the blowing component will blow the material to the arc part, the connecting part and the screening part. The material that meets the requirements will directly pass through the filter screen, and then the continuous grinding of the material that meets the requirements in the grinder body can be reduced, thereby reducing the occurrence of smaller particles in the ground material. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0031] Figure 2 It is a cross-sectional view of an embodiment of the present application.

[0032] Figure 3 It is a schematic diagram of the structure of the material lifting component of an embodiment of the present application.

[0033] Figure 4 It is a schematic diagram of the sealing assembly and baffle structure of an embodiment of the present application.

[0034] Figure 5 It is a schematic diagram of the structure of the blowing component of an embodiment of the present application.

[0035] Figure 6 It is a schematic diagram of the control component structure of an embodiment of the present application.

[0036] Figure 7 yes Figure 6 Enlarged view of point A in the middle.

[0037] 1. Grinding machine body; 11. Baffle; 12. Feeding channel; 13. Abutting roller; 14. Give way groove; 2. Grinding assembly; 21. Rotating shaft; 22. Fixed plate; 23. Mounting shaft; 24. Grinding hammer; 4. Filter screen; 41. Screening part; 42. Arc-shaped part; 43. Connecting part; 5. Lifting assembly; 51. Mounting plate; 52. Lifting shaft; 53. Lifting plate; 6. Blowing assembly; 61. Blowing pipe; 62. Blowing port; 65. Filter plate; 7. Blocking assembly; 71. Blocking plate; 72. Blocking spring; 8. Control assembly; 81. Control rod; 82. Control sleeve; 83. Control spring; 9. Control groove; 91. Limiting groove; 92. Guide groove; 93. Guide part. DETAILED DESCRIPTION

[0038] The following combination Figure 1-Figure 7 This application is described in further detail.

[0039] The present application embodiment discloses a grinding machine. Figure 1 and Figure 2 A grinder includes a grinder body 1 and a grinding assembly 2 arranged in the grinder body 1, the grinding assembly 2 is used to grind materials, and a dust removal assembly is arranged on the grinder body 1, the dust removal assembly is used to process dust generated by the crushed materials, and the dust removal assembly can adopt a bag dust removal method.

[0040] Reference Figures 2 to 4The grinding assembly 2 includes a rotating shaft 21 rotatably connected to the grinder body 1, a fixed plate 22 fixed on the rotating shaft 21, a mounting shaft 23 fixed on the fixed plate 22, and a grinding hammer 24 rotatably connected to the mounting shaft 23. At the same time, a filter screen 4 is arranged in the grinder body 1. The material falling through the feed port enters the grinder body 1, and then the grinding hammer 24 will hit the filter screen 4 during the swinging process. The material that meets the requirements will be discharged from the mesh holes on the filter screen 4, and then the material that hits the edge of the filter screen 4 and meets the requirements and the material whose large particles cannot pass through the filter screen 4 will continue to be hit by the grinding hammer 24 in the grinder body 1, and finally the material will be crushed and ground.

[0041] Reference Figures 2 to 4 The filter screen 4 includes a screening portion 41, an arc portion 42 and a connecting portion 43. The filter screen 4 can be detachably mounted on the grinder body 1. The diameter of the screening portion 41 is smaller than the diameter of the arc portion 42, and the screening portion 41 and the arc portion 42 are coaxially arranged. One end of the connecting portion 43 is fixed on the arc portion 42, and the other end is fixed on the screening portion 41. In this embodiment, the screening portion 41, the arc portion 42 and the connecting portion 43 are integrally formed, and filter holes are provided on the arc portion 42 and the connecting portion 43, and the size is the same as the filter holes on the screening portion 41. When grinding and crushing materials of different diameters, the filter screen 4 with different screening holes is directly replaced from the grinder body 1, and then the material particles thrown out by the filter screen 4 will be of different sizes, thereby achieving grinding of materials of different diameters by replacing different filter screens 4.

[0042] Reference Figures 2 to 4 A baffle 11 is arranged in the grinder body 1. In this embodiment, the baffle 11 is arranged as an arc structure, and the baffle 11 is arranged on one side of the arc portion 42 close to the grinding assembly 2. A feeding channel 12 is formed between the arc portion 42 and the baffle 11. The material falls from the feed port, and then during the swinging process of the grinding hammer 24, the material will be hit and hit on the arc portion 42. Then, the material that meets the requirements will enter the bottom of the grinder body 1 through the arc portion 42, and then hit the edge of the filter screen 4. The material that meets the requirements and the large particles will rebound toward the baffle 11. During the rebound process, under the influence of gravity, the large particles and some materials that meet the requirements will hit the baffle 11, and then fall along the baffle 11 to between the grinding hammer 24 and the screening part 41, and the grinding hammer 24 will continue to grind and crush the fallen material.

[0043] Reference Figures 2 to 5A material lifting component 5 is arranged between the baffle 11 and the arc-shaped portion 42, and a blowing component 6 is arranged on the material lifting component 5. The material lifting component 5 is used to lift the material falling from the baffle 11, and the blowing component 6 is used to blow the lifted material, and the material is blown onto the arc-shaped portion 42 and the connecting portion 43. At this time, the material that hits the edge of the filter screen 4 and meets the requirements will pass through the filtering holes on the arc-shaped portion 42 and the connecting portion 43 into the inner wall of the grinder body 1 and the filter screen 4, and finally enter the bottom of the grinder body 1 under the action of gravity, thereby reducing the situation where the material that hits the edge of the filter screen 4 and meets the requirements is repeatedly ground.

[0044] Reference Figures 2 to 5 The material lifting assembly 5 includes a mounting plate 51 fixedly mounted on the grinding machine body 1, a material lifting shaft 52 rotatably connected to the mounting plate 51, and a plurality of material lifting plates 53 fixed to the material lifting shaft 52. The material lifting plates 53 are arranged along the circumference of the rotating shaft 21. In this embodiment, four material lifting plates 53 are arranged, and a blocking assembly 7 is arranged on each material lifting plate 53. The blocking assembly 7 is used to block between the material lifting plate 53 and the baffle 11, so that the material rebounded on the baffle 11 can fall directly onto the material lifting plate 53. When the rebounded material falls onto the lifting plate 53, the lifting shaft 52 rotates to drive the four lifting plates 53 to rotate, and the lifting plate 53 with the material rotates to an inclined state. At this time, the material will fall under the action of gravity. During the falling process of the material, the blowing component 6 will blow the material toward the arc portion 42, the connecting portion 43 and the screening portion 41. The material that meets the requirements passes through the filter screen 4 directly, and then the continuous grinding of the material that meets the requirements in the grinder body 1 can be reduced, thereby reducing the occurrence of smaller particles in the ground material.

[0045] Reference Figures 2 to 5 The locking cam 72 is engaged with the locking cam 71 which is fixed to the locking cam 74 so that the locking cam 72 can be locked to the locking cam 74 by the locking cam 72 interlocking with the locking cam 74. The locking cam 72 is used to lock the locking cam 70 between the locking cam 70 and the locking cam 74.

[0046] Reference Figures 2 to 7A control component 8 is provided on the grinding machine body 1. After the material on the lifting plate 53 falls off under the action of gravity, under the action of the control component 8, the blocking plate 71 is completely extended from the lifting plate 53. At this time, the corresponding lifting plate 53 will rotate in the direction close to the baffle 11, and then the control component 8 can drive the blocking plate 71 on the lifting plate 53 to move in the direction close to the lifting shaft 52, so that the blocking plate 71 moves into the lifting plate 53, and then the lifting shaft 52 is in the process of rotation, and the abutment roller 13 abuts against the baffle 11, thereby better realizing the sealing effect.

[0047] Reference Figures 2 to 7 The blowing assembly 6 includes a blowing pipe 61 fixed on the grinding machine body 1, a fan (not shown in the figure) arranged on the ground, and a connecting pipe for connecting the fan and the blowing pipe 61. The blowing pipe 61 is provided with a blowing port 62, and the blowing port 62 is arranged toward the arc-shaped portion 42 and the connecting portion 43. At the same time, a filter plate 65 is installed on the blowing port 62. The setting of the filter plate 65 can prevent the material from entering the blowing pipe 61 from the blowing port 62. At the same time, a clearance groove 14 is provided on the lifting shaft 52. In this embodiment, four give-way grooves 14 are provided, and the four give-way grooves 14 are provided along the circumference of the rotating shaft 21. Then, when the lifting shaft 52 drives the lifting plate 53 to rotate, the give-way grooves 14 will correspond to the blowing port 62. At this time, the gas blown out through the blowing port 62 can make the material move toward the direction close to the arc portion 42 and the connecting portion 43. The material that meets the requirements is light in weight, and then it will pass through the arc portion 42 and the connecting portion 43 to achieve the purpose of separation, thereby reducing the further grinding and crushing of the material that meets the requirements.

[0048] Reference Figures 2 to 7 The control assembly 8 includes a control rod 81 fixed on the blocking plate 71, a control sleeve 82 slidably connected to the control rod 81 and a control spring 83 fixed on the control sleeve 82. The end of the control spring 83 away from the control sleeve 82 is fixed on the control rod 81. A control groove 9 for plugging the control sleeve 82 is provided on the mounting plate 51. Under the action of the control groove 9, the control sleeve 82 can be pushed to move in the direction close to the material lifting shaft 52, thereby moving the blocking plate 71 into the material lifting plate 53. On the one hand, it prevents the extended blocking plate 71 and the grinding hammer 24 from intersecting and colliding, and on the other hand, it facilitates the abutment of the abutment roller 13 and the surface of the baffle 11.

[0049] Reference Figures 2 to 7The control groove 9 includes a limit groove 91 and a guide groove 92. The limit groove 91 is opened along the circumference of the mounting plate 51. One end of the guide groove 92 is connected to the limit groove 91, and the depth of the limit groove 91 is the same as the depth of the guide groove 92. A guide portion 93 is provided at one end of the guide groove 92 away from the limit groove 91. The inner wall of the guide portion 93 is provided with an inclined surface. The control sleeve 82 abutting against the surface of the mounting plate 51 moves into the guide groove 92 through the inclined surface, and then moves into the limit groove 91 through the guide groove 92. The control sleeve 82 is in the limit groove 91. When the blocking plate 71 is in the fixed position, the blocking plate 71 will not hit the rotating grinding hammer 24 when it rotates toward the baffle 11, which makes it more convenient to use. In addition, in order to facilitate the control groove 9 to disengage from the limiting groove 91, a guide portion 93 is also provided at the end of the limiting groove 91 away from the guide groove 92, and an inclined surface is provided at the bottom of the guide portion 93. The control sleeve 82 can disengage from the limiting groove 91 through the inclined surface from the limiting groove 91, and then the blocking plate 71 is pushed to move in the direction away from the lifting shaft 52 under the action of the blocking spring 72.

[0050] The implementation principle of a grinder in the embodiment of the present application is as follows: when crushing and grinding materials, the materials enter the grinder body 1 through the feed port, and then fall under the action of gravity. During the falling process, the materials directly contact the swinging grinding hammer 24, and the grinding hammer 24 beats the materials in the direction close to the arc portion 42. During the beating process, part of the materials will be ground and crushed, and the materials that meet the requirements and correspond to the filter holes will pass through the arc portion 42. Then, the materials that meet the requirements and hit the edges of the filter screen 4 and the materials with large particles will rebound onto the baffle 11, and the baffle The material on 11 will fall onto the lifting plate 53 and the blocking plate 71, and the lifting shaft 52 will rotate, driving the lifting plate 53 containing the material to rotate in the direction away from the baffle 11. Then, when the lifting plate 53 is tilted, the material will separate from the lifting plate 53 under the action of gravity, and at the same time, the material will be scattered, and air will be blown to the material through the blowing pipe 61, so that the material that hit the edge of the filter screen 4 and meets the requirements will pass through the filter screen 4, and then the material that does not meet the requirements will continue to be crushed and ground under the action of the grinding hammer 24, thereby reducing the qualified material that continues to be ground in the grinder body 1.

[0051] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A grinder, comprising a grinder body and a grinding assembly disposed in the grinder body, characterized in that: The grinding assembly comprises a rotating shaft rotatably connected to the grinding machine body, a fixed disk fixed on the rotating shaft, a mounting shaft fixed on the fixed disk, and a grinding hammer rotatably connected to the mounting shaft. A filter screen is arranged in the grinding machine body, and the filter screen comprises a screening part, an arc-shaped part and a connecting part. The arc-shaped part and the connecting part are both provided with filtering holes, and the size is the same as the filtering holes on the screening part. The diameter of the screening part is smaller than the diameter of the arc-shaped part, and the screening part and the arc-shaped part are coaxially arranged, one end of the connecting part is fixed on the arc-shaped part, and the other end is fixed on the screening part; a baffle for contacting the rebounded material is arranged in the grinding machine body, and the baffle is arranged in an arc-shaped structure; a material raising component for raising the material falling on the baffle is arranged between the baffle and the arc-shaped part, and a blowing component for blowing the raised material to the arc-shaped part and the connecting part is arranged on the material raising component; The material lifting assembly includes a mounting plate fixedly mounted on the grinding machine body, a material lifting shaft rotatably connected to the mounting plate, and a plurality of material lifting plates fixed on the material lifting shaft; each of the material lifting plates is provided with a blocking assembly for blocking between the material lifting plate and the baffle.

2. A grinding machine according to claim 1, characterized in that: The blocking assembly includes a blocking plate slidably connected to the material lifting plate and a blocking spring fixed on the blocking plate. One end of the blocking spring away from the blocking plate is fixed to the material lifting plate, and the blocking spring pushes the blocking plate to move in a direction away from the material lifting plate.

3. A grinding machine according to claim 2, characterized in that: One end of the blocking plate away from the material lifting plate is rotatably connected with an abutting roller for contacting the surface of the baffle plate.

4. A grinding machine according to claim 1, characterized in that: The blowing assembly includes a blowing pipe fixed on the grinding machine body, a fan arranged on the ground, and a connecting pipe for connecting the fan and the blowing pipe. The blowing pipe is provided with a blowing port, and the blowing port is arranged toward the arc portion and the connecting portion. The lifting shaft is provided with a clearance groove for facilitating the passage of wind.

5. A grinding machine according to claim 4, characterized in that: A filter plate for blocking materials is installed on the air blowing port.

6. A grinding machine according to claim 1, characterized in that: The grinding machine body is provided with a control component for driving the blocking plate on the material lifting plate to move toward the direction close to the material lifting shaft, and the baffle is provided with a guiding surface.

7. A grinding machine according to claim 6, characterized in that: The control assembly comprises a control rod fixed on the blocking plate, a control sleeve slidably connected to the control rod and a control spring fixed on the control sleeve. The mounting plate is provided with a control groove for plugging the control sleeve.

8. A grinding machine according to claim 7, characterized in that: The control groove includes a limit groove and a guide groove. The limit groove is opened along the circumference of the mounting plate. One end of the guide groove is connected to the limit groove, and the depth of the limit groove is the same as the depth of the guide groove. A guide part is provided at one end of the guide groove away from the limit groove, and an inner wall of the guide part is provided with an inclined surface.

9. A grinding machine according to claim 8, characterized in that: A guiding portion is also provided at one end of the limiting groove away from the guiding groove, and an inclined surface is provided at the bottom of the guiding portion.

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