Miniature guide rail grinding machine

Abstract

The utility model relates to the technical field of grinding machines, in particular to a miniature guide rail grinding machine which comprises a machine frame, a working table capable of moving along the machine frame in a reciprocating mode is arranged on the machine frame, horizontal sliding mechanisms are arranged on the two sides of the machine frame and located above the working table in the width direction of the working table, and grinding wheel mechanisms are arranged on the horizontal sliding mechanisms. The horizontal sliding mechanism can drive the grinding wheel mechanisms to reciprocate in the width direction of the workbench, and the grinding wheel mechanisms are symmetrically arranged at the two ends of the horizontal sliding mechanism and comprise mounting frames symmetrically arranged at the two ends of the horizontal sliding mechanism. A grinding wheel telescopic rotating shaft is arranged on the side, facing the center of the horizontal sliding mechanism, of the mounting frame by arranging a vertical sliding mechanism, and a first grinding wheel is rotationally arranged at the bottom of the grinding wheel telescopic rotating shaft to enable the first grinding wheel to face the center of the horizontal sliding mechanism. The grinding wheel does not need to be replaced frequently during production, and the production efficiency of equipment is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of grinding machines, in particular to a micro guide rail grinding machine. Background Art

[0002] Guideway grinders play a vital role in the machining industry. Their design and application have a significant impact on improving product quality and production efficiency. The grinding process of guideway grinders is highly stable and repeatable, can achieve higher machining accuracy, and can meet the machining requirements with high requirements on workpiece size and surface roughness. They are particularly suitable for the machining of precision parts. Guideway grinders play an important role in modern manufacturing with their high precision, high efficiency, wide range of applications and reliable structural design.

[0003] The publication number is "CN203779323 U". A grinding machine capable of automatically dressing a grinding wheel comprises a frame, a crossbeam and a workbench that can move forward and backward are horizontally mounted on the frame, a slider that can slide left and right on the crossbeam is connected to the crossbeam, a grinding wheel mounting seat that can move up and down is mounted on the slider, a grinding wheel for processing a workpiece is mounted on the grinding wheel mounting seat, the slider comprises a first slider and a second slider, the grinding wheel mounting seat comprises a first grinding wheel mounting seat mounted on the first slider and a second grinding wheel mounting seat mounted on the second slider, the grinding wheel comprises a first grinding wheel mounted on the first grinding wheel mounting seat and a second grinding wheel mounted on the second grinding wheel mounting seat. The first grinding wheel is installed on the first grinding wheel mounting seat through a rotating block. The rotating axis of the rotating block is parallel to the moving direction of the workbench, and the axis of the first grinding wheel is perpendicular to the rotating axis of the rotating block. The grinding wheel of this technology is set in the middle of the mounting seat. Due to the limited space for axial movement of the mounting seat, the utilization rate of the grinding wheel is low. When processing fine products, it is necessary to stop the machine and replace the grinding wheel with a larger diameter for processing. As a result, the number of workpieces that can be processed in the same time is reduced and the production efficiency is reduced. Even if a grinding wheel with a larger diameter is replaced, the utilization rate of the grinding wheel is not very good. Therefore, this technology still has a certain room for improvement. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a micro guide rail grinder that can continuously operate and improve grinding efficiency in view of the deficiencies of the above-mentioned prior art.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a micro guide rail grinder, comprising a frame, a workbench that can move back and forth along the frame is provided on the frame, and horizontal sliding mechanisms are arranged on both sides of the frame and above the workbench along the width direction of the workbench, and a grinding wheel mechanism is provided on the horizontal sliding mechanism, and the horizontal sliding mechanism can drive the grinding wheel mechanism to move back and forth along the width direction of the workbench, and is characterized in that: the grinding wheel mechanism is symmetrically arranged at both ends of the horizontal sliding mechanism, and the grinding wheel mechanism includes mounting frames symmetrically arranged at both ends of the horizontal sliding mechanism, and the mounting frame is provided with a grinding wheel telescopic rotating axis through a vertical sliding mechanism toward the side of the center of the horizontal sliding mechanism, and a first grinding wheel is rotatably provided at the bottom of the grinding wheel telescopic rotating axis to cause the first grinding wheel to be eccentrically arranged toward the center of the horizontal sliding mechanism.

[0006] The above technical solution is adopted: by arranging mounting frames at both ends of the horizontal sliding mechanism, the mounting frames are arranged toward the inner center of the grinding wheel telescopic rotating axis and the first grinding wheel, so that the first grinding wheel is eccentrically arranged toward the center of the horizontal sliding mechanism to maximize the utilization of the grinding wheel. There is no need to frequently replace the grinding wheel during production, which greatly increases the production efficiency of the equipment. At the same time, through the adjustment of the vertical sliding mechanism, the grinding wheel can be quickly positioned and adjusted according to processing needs.

[0007] A further arrangement of the present invention is that the vertical sliding mechanism includes a first slide rail arranged along the vertical direction of the mounting seat toward the side of the grinding wheel telescopic rotating axis, a first slider is slidably installed on the first slide rail, and the first slider is fixedly connected to a fixing frame for fixing the grinding wheel telescopic rotating axis toward the center side of the horizontal sliding mechanism, and the grinding wheel telescopic rotating axis is fixedly connected to the fixing frame through a fixed structure.

[0008] The above technical solution is adopted: through the precise cooperation of the first slide rail and the first slider, the telescopic rotating axis of the grinding wheel can be precisely adjusted in the vertical direction. When the workpiece is transported to the appropriate position through the workbench, the grinding wheel mechanism is started to perform vertical reciprocating motion along the first guide rail through the first slider to achieve grinding of the top of the workpiece.

[0009] A further configuration of the utility model is that the fixing structure includes an embedded groove provided on the fixing frame for the embedded installation of the fixing ring, connecting ears are provided at both ends of the fixing ring, a connecting part is protruding outward from the bottom of the embedded groove, the connecting part and the connecting ear are both provided with fixing holes, and a sleeve hole is provided in the middle of the fixing ring for the sleeve connection of the telescopic rotating shaft of the grinding wheel.

[0010] The above technical solution is adopted: through the cooperation of the embedded groove and the fixing ring, as well as the fixation of the connecting ear and the fixing hole of the connecting part, a stable connection between the telescopic rotating axis of the grinding wheel and the fixed frame is achieved, avoiding the risk of loosening or falling off caused by vibration or impact, and at the same time allowing the position and angle of the grinding wheel to be adjusted according to different processing requirements, thereby enhancing the flexibility and adaptability of the equipment.

[0011] A further configuration of the present invention is that the horizontal sliding mechanism includes support frames respectively located on both sides of the frame, a crossbeam connecting the two support frames, and second slide rails respectively arranged opposite to the crossbeams, a plurality of second sliders slidingly provided on the second slide rails, the other end of the second slider is fixedly connected to the mounting frame, and the mounting frames approach each other along the second slide rails through the second sliders.

[0012] The above technical solution is adopted: through the support frame, the crossbeam connecting the two support frames, and the starting grinding wheel mechanism, the second slider is used to move closer to and farther away from each other along the second slide rail. When the workpiece is transported to the appropriate position through the workbench, the two sets of grinding wheel mechanisms approach each other until the workpiece is fixed and clamped, and it can also grind different sides of the workpiece at the same time.

[0013] A further configuration of the present invention is that third slide rails are provided on both sides of the frame along the length of the frame, a plurality of third sliders are provided on the third slide rails, the other ends of the third sliders are fixedly connected to the workbench, and a grinding wheel dressing device is provided on the upper end of the workbench.

[0014] The above technical solution is adopted: by setting the third slide rail and the third slider, the workbench can move back and forth along the frame, driving the workpiece to move, achieving more comprehensive grinding and improving grinding efficiency.

[0015] A further arrangement of the present invention is: the grinding wheel dressing device includes a base, a dressing device is installed at one end of the base, a driving member base is provided at one end of the base away from the dressing device, a strip hole is provided at the bottom end of the driving member base, the driving member base is fixedly connected to the base through the strip hole, a driving member is installed at the upper end of the mounting frame, the driving member is passed through the driving member base and is provided with a first synchronous wheel, the dressing device is installed with a second synchronous wheel by setting a mounting structure, and the first synchronous wheel and the second synchronous wheel are linked and connected.

[0016] The above technical solution is adopted: the grinding wheel dresser is located on the base and is equipped with a driving member through a mounting bracket at one end away from the dressing device. A strip hole is provided at the bottom end of the mounting bracket. The mounting bracket can adjust the front and rear position of the mounting bracket according to the processed product. The driving member is equipped with a first synchronous wheel, and the dressing device is equipped with a second synchronous wheel. The first synchronous wheel and the second synchronous wheel are linked and connected. The first synchronous wheel drives the second synchronous wheel to rotate, thereby driving the dressing device to rotate.

[0017] A further configuration of the present invention is that the mounting structure includes a U-shaped seat arranged at one end of the base away from the driving member base, the U-shaped seat is provided with a mounting groove, the trimming device includes a central shaft, and the second synchronous wheel is sleeved on the central shaft and installed in the mounting groove.

[0018] The above technical solution is adopted: the first synchronous wheel is sleeved on the first central axis, so that the first synchronous wheel is installed in the first installation groove formed by the mounting frame and the base. When the driving member rotates, it can drive the first synchronous wheel located on the central axis to rotate in the installation groove.

[0019] A further arrangement of the present invention is: the dressing device includes a mounting plate sleeved on the central shaft, the mounting plate is fixedly connected to the U-shaped seat, the central shaft is located above the mounting plate and is fixedly connected to a plate cover, the plate cover abuts against the mounting plate, a lower shaft seat is provided above the plate cover, an upper shaft seat is provided at one end of the central shaft away from the second synchronous wheel, and a connecting groove for installing the second grinding wheel is formed between the upper and lower shaft seats.

[0020] The above technical solution is adopted: the second central shaft is located above the second synchronous wheel and is equipped with a mounting plate fixedly connected to the U-shaped seat. The second central shaft is limited to the mounting plate by abutting against the mounting plate through the plate cover, so that a certain gap is generated between the second central shaft and the base. The second grinding wheel is installed in the connecting groove formed between the upper shaft seat and the lower shaft seat. When the first synchronous gear drives the second synchronous gear to rotate through the synchronous toothed belt, the second synchronous gear drives the second central shaft and the dressing wheel located on the second central shaft to rotate to complete the dressing work.

[0021] The beneficial effects of the utility model are as follows: the grinding wheel telescopic rotating shaft and the first grinding wheel arranged toward the inner center of the mounting frame promote the first grinding wheel to be eccentrically arranged toward the center of the horizontal sliding mechanism, so that the grinding wheel can be utilized to the maximum extent. The grinding wheel does not need to be frequently replaced during production, which greatly increases the production efficiency of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0023] Figure 2 This is a structural diagram of the vertical sliding mechanism of the utility model.

[0024] Figure 3 It is an overall exploded view of the utility model.

[0025] Figure 4 This is a structural schematic diagram of the grinding wheel dressing device of the utility model.

[0026] Figure 5 This is an exploded diagram of the structure of the grinding wheel dressing device of the utility model.

[0027] Figure 6 This is an exploded view of the structure of the trimming device of the present invention.

[0028] Label Notes: 1-frame, 2-workbench, 3-horizontal sliding mechanism, 4-grinding wheel mechanism, 5-vertical sliding mechanism, 6-fixing ring, 7-embedded groove, 8-connecting ear, 9-connecting part, 10-fixing hole, 11-sleeving hole, 12-support frame, 13-beam, 14 -Second slide rail, 15-Second slider, 16-Third slide rail, 17-Third slider, 18-Grinding wheel dressing device, 19-Base, 20-Dressing device, 21-Drive member base, 22-Drive member, 23-First synchronous wheel, 24-Second synchronous wheel, 25-U-shaped seat, 26-Mounting groove, 401-Mounting frame, 402-Grinding wheel telescopic rotating axis, 403-First grinding wheel, 501-First slide rail, 502-First slider, 503-Fixed frame, 2001-Middle shaft, 2002-Mounting disk, 2003-Disc cover, 2004-Lower shaft seat, 2005-Upper shaft seat, 2006-Connecting groove, 2007-Second grinding wheel, 2101-Strip hole. DETAILED DESCRIPTION

[0029] This specific embodiment and the drawings of the disclosed embodiments only involve structures related to the disclosed embodiments. Other structures can refer to general designs. In the absence of conflict, the same embodiment and different embodiments of the utility model can be combined with each other.

[0030] like Figure 1-3The utility model shown in the figure provides the following technical solutions: a micro guide rail grinder, comprising a frame 1, a workbench 2 capable of reciprocating along the frame 1, a horizontal sliding mechanism 3 arranged on both sides of the frame 1 and above the workbench 2 along the width direction of the workbench 2, a grinding wheel mechanism 4 provided on the horizontal sliding mechanism 3, the horizontal sliding mechanism 3 capable of driving the grinding wheel mechanism 4 to reciprocate along the width direction of the workbench 2, the grinding wheel mechanism 4 symmetrically arranged at both ends of the horizontal sliding mechanism 3, the grinding wheel mechanism 4 comprising mounting frames 401 symmetrically arranged at both ends of the horizontal sliding mechanism 3, the mounting frame 401 is provided with a grinding wheel telescopic rotating shaft 402 toward one side of the center of the horizontal sliding mechanism 3 by setting a vertical sliding mechanism 5, the grinding wheel telescopic rotating shaft 402 is provided with a second rotating shaft 402 at the bottom. A grinding wheel 403 prompts the first grinding wheel 403 to be eccentrically arranged toward the center of the horizontal sliding mechanism 3. Through the mounting brackets 401 arranged at both ends of the horizontal sliding mechanism 3, the mounting brackets 401 are arranged toward the grinding wheel telescopic rotating shaft 402 and the first grinding wheel 403 at the inner center, so that the first grinding wheel 403 is eccentrically arranged toward the center of the horizontal sliding mechanism 3 to maximize the use of the grinding wheel. There is no need to frequently replace the grinding wheel during production, which greatly increases the production efficiency of the equipment. At the same time, through the adjustment of the vertical sliding mechanism 5, the grinding wheel can be quickly positioned and adjusted according to processing needs. The vertical sliding mechanism 5 includes a first slide rail 501 arranged along the vertical direction of the mounting seat toward one side of the grinding wheel telescopic rotating shaft 402, and a first slider 5 is slidably installed on the first slide rail 501. 02, the first slider is fixedly connected to the fixing frame 503 to which the grinding wheel telescopic rotating shaft 402 is fixedly connected toward the center side of the horizontal sliding mechanism 3, and the grinding wheel telescopic rotating shaft 402 is fixedly connected to the fixing frame 503 through a fixed structure. Through the precise cooperation of the first slide rail 501 and the first slider 502, the grinding wheel telescopic rotating shaft 402 can be precisely adjusted in the vertical direction. When the workpiece is transported to a suitable position through the workbench 2, the grinding wheel mechanism 4 is started to perform vertical reciprocating motion along the first guide rail through the first slider 502 to realize grinding of the top of the workpiece. The fixed structure includes an embedded groove 7 for the embedded installation of the fixing ring 6 set on the fixing frame 503, and connecting ears 8 are set at both ends of the fixing ring 6. The bottom of the embedded groove 7 is protruding outward and provided with a connecting portion 9 , the connecting part 9 and the connecting ear 8 are both provided with a fixing hole 10, and the middle of the fixing ring 6 is provided with a sleeve hole 11 for the telescopic rotating shaft 402 of the grinding wheel to be sleeved and connected. Through the cooperation of the embedded groove 7 and the fixing ring 6, and the fixation of the connecting ear 8 and the fixing hole 10 of the connecting part 9, a stable connection between the telescopic rotating shaft 402 of the grinding wheel and the fixed frame 503 is achieved, avoiding the risk of loosening or falling off caused by vibration or impact, and at the same time allowing the position and angle of the grinding wheel to be adjusted according to different processing requirements, thereby enhancing the flexibility and adaptability of the equipment. The horizontal sliding mechanism includes support frames 12 respectively located on both sides of the frame 1, a crossbeam 13 connecting the two support frames 12, and second slide rails 14 respectively arranged relative to the crossbeam 13. A plurality of second sliders 15 are slidably provided on the second slide rails 14.The other end of the second slider 15 is fixedly connected to the mounting frame 401. The mounting frames 401 are moved closer to each other along the second slide rail 14 via the second slider 15. The grinding wheel mechanisms 4 are started and moved closer to and away from each other along the second slide rail 14 via the support frame 12, the crossbeam 13 connecting the two support frames 12, and the second slider 15. When the workpiece is transported to the appropriate position via the workbench 2, the two sets of grinding wheel mechanisms 4 move closer to each other until the workpiece is fixedly clamped, thereby enabling simultaneous grinding of different sides of the workpiece.

[0031] like Figure 3-6The utility model shown in the figure provides the following technical solutions, a micro guide rail grinder, a frame 1 is provided with a third slide rail 16 on both sides along the length of the frame 1, the third slide rail 16 is provided with a plurality of third sliders 17, the other end of the third slider 17 is fixedly connected to the workbench 2, and the upper end of the workbench 2 is provided with a grinding wheel dressing device 2018. Through the arrangement of the third slide rail 16 and the third slider 17, the workbench 2 can move back and forth along the frame 1, driving the workpiece to move, achieving more comprehensive grinding and improving grinding efficiency. The grinding wheel dressing device 2018 includes a base 19, a dressing device 20 is installed at one end of the base 19, and a driving member 22 base 21 is provided at the end of the base 19 away from the dressing device 20. The bottom end of the driving member 22 base 21 is provided with a strip hole 2101, and the driving member 2 The base 21 is fixedly connected to the base 19 through the strip hole 2101. The upper end of the mounting frame 401 is equipped with a driving member 22, which is inserted into the driving member 22. The base 21 is provided with a first synchronous wheel 23. The dressing device 20 is provided with a second synchronous wheel 24 by setting a mounting structure. The first synchronous wheel 23 and the second synchronous wheel 24 are linked together. The grinding wheel dresser is located on the base 19 and is equipped with the driving member 22 through the mounting frame 401 at one end away from the dressing device 20. The bottom end of the mounting frame 401 is provided with a strip hole 2101. The mounting frame 401 can adjust the front and rear position of the mounting frame 401 according to the product being processed. The driving member 22 is equipped with the first synchronous wheel 23. The dressing device 20 is equipped with the second synchronous wheel 24. The first synchronous wheel 23 and the second synchronous wheel 24 are connected together. The first synchronous wheel 23 drives the second synchronous wheel 24 to rotate, and drives the trimming device 20 to rotate. The mounting structure includes a U-shaped seat 25 provided at one end of the base 19 away from the driving member 22 base 21. The U-shaped seat 25 is provided with a mounting groove 26. The trimming device 20 includes a central axis 2001. The second synchronous wheel 24 is sleeved on the central axis 2001 and mounted in the mounting groove 26. The first synchronous wheel 23 is sleeved on the first central axis 2001, so that the first synchronous wheel 23 is installed in the first mounting groove 26 formed by the mounting frame 401 and the base 19. When the driving member 22 rotates, the first synchronous wheel 23 located on the central axis 2001 can be driven to rotate in the mounting groove 26. The trimming device 20 includes a mounting plate 2002 sleeved on the central axis 2001. The mounting plate 20 02 is fixedly connected to the U-shaped seat 25, the middle shaft 2001 is located above the mounting disk 2002 and is fixedly connected with a disk cover 2003, the disk cover 2003 abuts against the mounting disk 2002, and a lower shaft seat 2004 is provided above the disk cover 2003. An upper shaft seat 2005 is provided at one end of the middle shaft 2001 away from the second synchronous wheel 24, and a connecting groove 2006 for installing the second grinding wheel 2007 is formed between the upper shaft seat 2005 and the lower shaft seat 2004. The second middle shaft 2001 is located above the second synchronous wheel 24 and is equipped with a mounting disk 2002 fixedly connected to the U-shaped seat 25. The second middle shaft 2001 is limited to the mounting disk 2002 by abutting against the mounting disk 2002 through the disk cover 2003, so that a certain gap is generated between the second middle shaft 2001 and the base 19.The second grinding wheel 2007 is installed in the connecting groove 2006 formed between the upper shaft seat 2005 and the lower shaft seat 2004. When the first synchronous gear drives the second synchronous gear to rotate through the synchronous toothed belt, the second synchronous gear drives the second central shaft 2001 and the dressing wheel located on the second central shaft 2001 to rotate, completing the dressing work.

[0032] The beneficial effects of the present invention are as follows: the grinding wheel telescopic rotating shaft 402 and the first grinding wheel 403 are arranged toward the inner center of the mounting frame 401, so that the first grinding wheel 403 is eccentrically arranged toward the center of the horizontal sliding mechanism 3, which can maximize the utilization of the grinding wheel. There is no need to frequently replace the grinding wheel during production, which greatly increases the production efficiency of the equipment.

Claims

1. A micro guide rail grinder, comprising a frame, a worktable capable of reciprocating along the frame being provided on the frame, horizontal sliding mechanisms being arranged on both sides of the frame and above the worktable along the width direction of the worktable, a grinding wheel mechanism being provided on the horizontal sliding mechanisms, the horizontal sliding mechanisms being capable of driving the grinding wheel mechanism to reciprocate along the width direction of the worktable, and characterized in that: The grinding wheel mechanism is symmetrically arranged at both ends of the horizontal sliding mechanism, and the grinding wheel mechanism includes mounting frames symmetrically arranged at both ends of the horizontal sliding mechanism. The mounting frame is provided with a grinding wheel telescopic rotating axis through a vertical sliding mechanism toward the side of the center of the horizontal sliding mechanism, and a first grinding wheel is rotatably arranged at the bottom of the grinding wheel telescopic rotating axis to cause the first grinding wheel to be eccentrically arranged toward the center of the horizontal sliding mechanism.

2. The micro guide rail grinder according to claim 1, characterized in that: The vertical sliding mechanism includes a first slide rail arranged along the vertical direction of the mounting seat toward the side of the grinding wheel telescopic rotating axis, a first slider is slidably installed on the first slide rail, and the first slider is fixedly connected to the fixing frame to which the grinding wheel telescopic rotating axis is fixedly connected toward the center side of the horizontal sliding mechanism, and the grinding wheel telescopic rotating axis is fixedly connected to the fixing frame through a fixed structure.

3. The micro guide rail grinder according to claim 2, characterized in that: The fixing structure includes an embedded groove provided on the fixing frame for the embedded installation of the fixing ring, connecting ears are provided at both ends of the fixing ring, a connecting part is protruding outward from the bottom of the embedded groove, the connecting part and the connecting ear are both provided with fixing holes, and a sleeve hole is provided in the middle of the fixing ring for the sleeve connection of the grinding wheel telescopic rotating shaft.

4. The micro guide rail grinder according to claim 1, characterized in that: The horizontal sliding mechanism includes support frames located on both sides of the frame, a crossbeam connecting the two support frames, and second slide rails respectively arranged opposite to the crossbeams. A plurality of second sliders are slidingly provided on the second slide rails. The other ends of the second sliders are fixedly connected to the mounting frames. The mounting frames are approached to each other along the second slide rails through the second sliders.

5. A micro guide rail grinder according to any one of claims 1 to 4, characterized in that: A third slide rail is provided on both sides of the frame along the length of the frame, and a plurality of third sliders are provided on the third slide rails. The other end of the third slider is fixedly connected to the workbench, and a grinding wheel dressing device is provided on the upper end of the workbench.

6. The micro guide rail grinding machine according to claim 5, characterized in that: The grinding wheel dressing device includes a base, a dressing device is installed at one end of the base, a driving member base is provided at the end of the base away from the dressing device, a strip hole is provided at the bottom end of the driving member base, the driving member base is fixedly connected to the base through the strip hole, a driving member is installed at the upper end of the mounting frame, the driving member is passed through the driving member base and is provided with a first synchronous wheel, the dressing device is installed with a second synchronous wheel by setting a mounting structure, and the first synchronous wheel and the second synchronous wheel are linked and connected.

7. The micro guide rail grinding machine according to claim 6, characterized in that: The mounting structure includes a U-shaped seat provided at one end of the base away from the driving member base, the U-shaped seat is provided with a mounting groove, the trimming device includes a central shaft, and the second synchronous wheel is sleeved on the central shaft and installed in the mounting groove.

8. The micro guide rail grinding machine according to claim 7, characterized in that: The dressing device includes a mounting plate sleeved on the central shaft, the mounting plate is fixedly connected to the U-shaped seat, the central shaft is located above the mounting plate and is fixedly connected to a plate cover, the plate cover abuts against the mounting plate, a lower shaft seat is provided above the plate cover, an upper shaft seat is provided at the end of the central shaft away from the second synchronous wheel, and a connecting groove for mounting the second grinding wheel is formed between the upper and lower shaft seats.

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