A grinding device for machining a rotating shaft of a micro motor

Abstract

The application relates to the technical field of rotating shaft grinding, in particular to a grinding device for micro motor rotating shaft machining, which comprises a supporting table, a grinding mechanism and a detection mechanism installed on the grinding mechanism; a damping mechanism installed on the detection mechanism and used for reducing the speed of the blank; the detection mechanism comprises a mounting shell, a detection assembly, a driving assembly, a pressing assembly and a damping assembly; the mounting shell is installed on the grinding mechanism; the detection assembly is installed in the mounting shell and used for detecting the grinding effect of the grinding mechanism; the driving assembly is installed in the mounting shell and used for driving the pressing assembly to move; the pressing assembly is installed at the driving end of the driving assembly and used for pressing the detection assembly; and the damping assembly is installed in the mounting shell; the application realizes the detection of the roughness of the grinding roller surface through the rotation of the polishing roller; when the roughness decreases, the roughness of the grinding roller surface is recovered through the stop of the polishing roller, and the replacement frequency of the grinding roller is reduced.

Description

Technical Field

[0001] This invention relates to the field of shaft grinding technology, and more specifically to a grinding device for machining micro motor shafts. Background Technology

[0002] In the production process of micro motors, the rotating shaft needs to be assembled into the motor, and the rotating shaft needs to be ground. The blank is placed in a centerless grinding device, and the rotating surface of the blank is ground by centerless grinding.

[0003] Chinese invention patent CN113941909B discloses a centerless grinder, belonging to the field of grinding machine technology. It includes a grinder body with a feed end and a discharge end. The centerless grinder also includes a frame, a first feed roller, and a second feed roller. The frame is located at the feed end of the grinder body. A feeding channel is formed between the first and second feed rollers, with one end of the feeding channel facing the feed end. The first and second feed rollers rotate around their respective axes and are respectively engaged with the frame. The first feed roller is horizontally positioned, and the second feed roller is obliquely positioned towards the feed end. The first and second feed rollers cooperate to feed the inner or outer ring of a bearing to the feed end. Compared with existing technologies, the grinding machine body, frame, and the cooperation of the first and second feed rollers enable the feeding of the inner or outer ring of the bearing, reducing manual feeding and mitigating safety hazards.

[0004] Centerless grinders feed the blank by rotating the grinding wheel and the conveying wheel in different directions, so that the blank is ground and conveyed at the same time. However, the surface of the grinding wheel, which is rough, will be smoothed over a long period of use, which may affect the grinding effect on the rotating shaft. Summary of the Invention

[0005] The purpose of this invention is to address the problems existing in the background art by proposing a grinding device for machining micro motor shafts.

[0006] The technical solution of this invention: A grinding device for machining micro motor shafts, comprising a support table and a grinding mechanism, a detection mechanism mounted on the grinding mechanism; and a damping mechanism mounted on the detection mechanism for decelerating the workpiece; the detection mechanism includes a mounting shell, a detection component, a drive component, a pressing component, and a damping component; the mounting shell is mounted on the grinding mechanism; the detection component is mounted inside the mounting shell and is used to detect the grinding effect of the grinding mechanism; the drive component is mounted inside the mounting shell and is used to drive the pressing component to move; the pressing component is mounted on the drive end of the drive component and is used to press the detection component; the damping component is mounted inside the mounting shell and is used to slow down the descent speed of the pressing component; the detection component is in contact with the rotating end of the grinding mechanism and rotates with it.

[0007] Preferably, the detection component includes a striking part, a retaining wheel, and a grinding roller; the striking part is rotatably connected inside the mounting housing; the retaining wheel is mounted on the striking part; the grinding roller is mounted on the retaining wheel; and the grinding roller is in contact with the surface of the rotating end of the grinding mechanism.

[0008] Preferably, the drive assembly includes a second drive device, a mounting plate, and an elastic element; the second drive device is installed inside the mounting housing; the mounting plate is installed on the drive end of the second drive device; and the two ends of the elastic element are respectively connected to the pressing assembly and the mounting plate.

[0009] Preferably, the pressing assembly includes a lifting part, a pressing part, and a movable part; the lifting part is installed at the movable end of the drive assembly; both the pressing part and the movable part are installed at the bottom end of the lifting part; the locking wheel is located on the descending path of the pressing part; and the striking part is located on the descending path of the movable part.

[0010] Preferably, the damping assembly includes a lifting piston shaft, a piston cylinder, and a one-way vent pipe; the piston cylinder is installed inside the mounting housing; the top end of the lifting piston shaft is connected to the lifting part, and the bottom end is movably sleeved inside the piston cylinder; the one-way vent pipe is installed on the side of the piston cylinder.

[0011] Preferably, the damping mechanism includes a rotating rod, a pressing assembly, and a control assembly; the rotating rod is mounted on the bottom of the mounting housing; the control assembly is mounted on the bottom of the piston cylinder; the pressing assembly is connected to the control assembly and is used to press down the rotating rod.

[0012] Preferably, the control component includes a one-way vent pipe, an elastic element, a lifting plate, a sealing ring, and the one-way vent pipe; the one-way vent pipe is installed at the bottom of the piston cylinder; the one-way vent pipe is installed at the bottom of the lifting piston shaft; the two ends of the elastic element are respectively connected to the inner cavity of the one-way vent pipe and the lifting plate; the lifting plate is located on the descending path of the one-way vent pipe, the one-way vent pipe is separated from the lifting plate, and the elasticity of the elastic element causes the lifting plate to fit against the sealing ring.

[0013] Preferably, the pressing assembly includes a second piston cylinder, a slow venting valve, an elastic piston shaft, and a pressing plate; the top end of the second piston cylinder is connected to the bottom of the second one-way vent pipe; the slow venting valve is installed on the top of the second piston cylinder; the top end of the elastic piston shaft is connected to the top of the inner cavity of the second piston cylinder, and the bottom end passes through the second piston cylinder and connects to the pressing plate; the pressing plate is located above the rotating rod.

[0014] Preferably, the grinding mechanism includes a protective shell, a drive device, a grinding roller, a drive roller, a support part, and a spraying part; there are two protective shells and two drive devices; both protective shells are installed above the support platform, and the two drive devices are respectively installed on the two protective shells; the grinding roller and the drive roller are respectively installed inside the two protective shells, and the grinding roller and the drive roller are respectively installed on the output shafts of the two drive devices; the support part is installed on the top of the support platform and is located between the grinding roller and the drive roller; the spraying part is installed on the protective shell, and the spraying end faces the grinding roller.

[0015] Compared with the prior art, the above-mentioned technical solution of the present invention has the following beneficial technical effects: Two drive devices are activated, one driving the grinding roller and the other the drive roller to rotate. This drives the blank on the support to move and grinds the rotating surface of the blank. Through contact between the grinding roller and the polishing roller, the polishing roller rotates, causing the striking part and the retaining wheel to rotate. The striking part intermittently strikes the moving part upwards, preventing the pressing part from contacting the retaining wheel. This ensures that if the surface roughness of the grinding roller is acceptable, slippage will not occur between the grinding roller and the polishing roller, allowing the polishing roller to rotate at high speed. Conversely, if the surface roughness of the grinding roller decreases, slippage will occur between it and the polishing roller. The method drives the grinding roller to rotate, which in turn causes the moving part and the pressing part to descend through the elasticity of the first elastic element. The pressing part descends and presses against the retaining wheel, pressing the grinding roller tightly against the surface of the grinding roller. This ensures that the moving part of the grinding roller and the grinding roller are in close contact, and the grinding roller grinds the surface of the grinding roller, thereby automatically restoring the roughness of the grinding roller. This allows the roughness of the grinding roller surface to be detected by the rotation of the grinding roller. When the roughness decreases, the grinding roller stops rotating to restore the roughness of the grinding roller surface, reducing the frequency of grinding roller replacement.

[0016] When the grinding roller becomes relatively smooth, the rotational speed of the grinding roller will decrease. At this time, the rotational speed of the striking part decreases, which in turn reduces the frequency of the striking part striking and pushing the moving part. The moving part then frequently drives the lifting part and the lifting piston shaft to descend past the one-way air outlet pipe. At this time, the lifting piston shaft presses down the lifting plate, thereby squeezing the air in the inner cavity of piston cylinder one into piston cylinder two, which in turn makes the pressing plate contact the rotating rod, causing the rotational speed of the rotating rod to decrease. The rotating rod then limits the blank above the clamping wheel. By slowing down the rotational speed of the rotating rod, the passing speed of the blank is reduced, thus ensuring that the rotating surface of the blank can be fully ground by the grinding roller with reduced roughness. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the structure of the grinding roller proposed in this invention; Figure 3This is a schematic diagram of the structure of the grinding roller proposed in this invention; Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle; Figure 5 This is a schematic diagram of the structure of the elastic element proposed in this invention; Figure 6 For the present invention Figure 5 Enlarged view of point B in the middle; Figure 7 This is a schematic diagram of the piston shaft structure proposed in this invention; Figure 8 For the present invention Figure 7 Enlarged view of point C in the middle; Reference numerals: 1. Support platform; 2. Protective shell; 3. Drive device one; 4. Grinding roller; 5. Drive roller; 6. Support part; 7. Mounting shell; 8. Spraying part; 9. Drive device two; 10. Mounting plate; 11. Elastic element one; 12. Lifting part; 13. Pressing part; 14. Moving part; 15. Striking part; 16. Snap-fit ​​wheel; 17. Grinding roller; 18. Lifting piston shaft; 19. Piston cylinder one; 20. One-way air inlet pipe; 21. One-way air outlet pipe one; 22. Elastic element two; 23. Lifting plate; 24. Sealing ring; 25. One-way air outlet pipe two; 26. Piston cylinder two; 27. Slow air valve; 28. Elastic piston shaft; 29. ​​Pressing plate; 30. Rotating rod. Detailed Implementation

[0018] Example 1, as Figures 1-8 As shown, the present invention proposes a grinding device for machining a micro motor shaft, comprising a support platform 1 and a grinding mechanism, a detection mechanism mounted on the grinding mechanism, and a damping mechanism mounted on the detection mechanism for decelerating the workpiece; the detection mechanism includes a mounting shell 7, a detection component, a drive component, a pressing component, and a damping component; the mounting shell 7 is mounted on the grinding mechanism; the detection component is mounted inside the mounting shell 7 and is used to detect the grinding effect of the grinding mechanism; the drive component is mounted inside the mounting shell 7 and is used to drive the pressing component to move; the pressing component is mounted on the drive end of the drive component and is used to press the detection component; the damping component is mounted inside the mounting shell 7 and is used to slow down the descent speed of the pressing component; the detection component is in contact with the rotating end of the grinding mechanism and rotates with it.

[0019] The testing assembly includes a striking part 15, a retaining wheel 16, and a grinding roller 17. The striking part 15 is rotatably connected to the mounting housing 7. The retaining wheel 16 is mounted on the striking part 15. The grinding roller 17 is mounted on the retaining wheel 16. The grinding roller 17 is in contact with the surface of the rotating end of the grinding mechanism. The movable part 14 is configured as an arc-shaped plate, or it can be configured as a roller. The striking part 15 can be configured as a rhombus or other shapes, so that the rotation of the striking part 15 can drive the movable part 14 and the pressing part 13 to move. The grinding roller 17 can be configured with a surface of diamond particles or other forms.

[0020] The drive assembly includes a second drive device 9, a mounting plate 10, and an elastic element 11. The second drive device 9 is installed inside the mounting housing 7. The mounting plate 10 is installed on the drive end of the second drive device 9. The two ends of the elastic element 11 are respectively connected to the pressing assembly and the mounting plate 10. When the pressing part 13 and the locking wheel 16 are engaged, the grinding roller 17 stops rotating. After the grinding roller 4 has been ground and repaired by the mounting housing 7 for a period of time, the second drive device 9 is started to drive the pressing part 13 and the locking wheel 16 to separate, thereby allowing the grinding roller 17 to resume rotation.

[0021] The pressing assembly includes a lifting part 12, a pressing part 13, and a movable part 14; the lifting part 12 is installed at the movable end of the drive assembly; the pressing part 13 and the movable part 14 are both installed at the bottom end of the lifting part 12; the locking wheel 16 is located on the descending path of the pressing part 13; and the striking part 15 is located on the descending path of the movable part 14.

[0022] The damping assembly includes a lifting piston shaft 18, a piston cylinder 19, and a one-way vent pipe 21. The piston cylinder 19 is installed inside the mounting housing 7. The top end of the lifting piston shaft 18 is connected to the lifting part 12, and the bottom end is movably sleeved inside the piston cylinder 19. The one-way vent pipe 21 is installed on the side of the piston cylinder 19. Through the contact between the grinding roller 17 and the polishing roller 4, the polishing roller 4 drives the grinding roller 17 to rotate, and the grinding roller 17 drives the striking part 15 to rotate. The rotation of the striking part 15 pushes the movable part 14 upward, which in turn drives the lifting part 14 to rotate. The lifting piston shaft 18 and the lifting part 12 rise, compressing the elastic element 11. At the same time, external air is drawn into the piston cylinder 19 through the one-way air intake pipe 20. When the striking part 15 separates from the movable part 14, the elasticity of the elastic element 11 causes the lifting part 12 and the movable part 14 to descend. However, at this time, the air inside the lifting piston shaft 18 can only be slowly discharged through the one-way air outlet pipe 21, which makes the descent speed of the movable part 14 slow down, thus avoiding the situation where the movable part 14 descends directly after the striking part 15 separates from the movable part 14.

[0023] Example 2, as Figure 2 , Figure 3 , Figures 5-8As shown, the present invention proposes a grinding device for machining micro motor shafts. Compared with Embodiment 1, the damping mechanism of this embodiment includes a rotating rod 30, a pressing component, and a control component; the rotating rod 30 is installed at the bottom of the mounting shell 7; the control component is installed at the bottom of the piston cylinder 19; the pressing component is connected to the control component and is used to press down the rotating rod 30.

[0024] The control assembly includes a one-way air outlet pipe 21, an elastic element 22, a lifting plate 23, a sealing ring 24, and a one-way air outlet pipe 25. The one-way air outlet pipe 25 is installed at the bottom of the piston cylinder 19; the one-way air outlet pipe 21 is installed at the bottom of the lifting piston shaft 18; both ends of the elastic element 22 are connected to the inner cavity of the one-way air outlet pipe 25 and the lifting plate 23, respectively; the lifting plate 23 is located on the descending path of the one-way air outlet pipe 21, and the one-way air outlet pipe 21 is separated from the lifting plate 23. The elasticity of the elastic element 22 causes the lifting plate 23 to fit against the sealing ring 24; when the grinding roller 4 is in normal use, the one-way air outlet pipe 21... When the contact frequency between the moving part 14 and the striking part 15 is relatively high, most of the air inside the piston cylinder 19 is directly discharged from the one-way exhaust pipe 21. If the surface of the grinding roller 4 is smooth, the rotational speed of the grinding roller 4 driving the grinding roller 17 decreases, and the frequency at which the striking part 15 pushes the moving part 14 upward decreases. At this time, the distance that the lifting piston shaft 18 descends increases, causing the lifting piston shaft 18 to pass over the one-way exhaust pipe 21. Consequently, the lifting piston shaft 18 drives the one-way exhaust pipe 21 to press down the lifting plate 23 and separate it from the sealing ring 24, allowing the one-way exhaust pipe 25 to connect with the piston cylinder 19. Air in piston cylinder 19 is transported to piston cylinder 26 through one-way exhaust pipe 25. However, when the lifting piston shaft 18 descends at a low frequency past one-way exhaust pipe 21, most of the air entering piston cylinder 26 is slowly discharged through slow ventilation valve 27. After the grinding effect of grinding roller 4 further decreases, the lifting piston shaft 18 begins to descend at a high frequency past one-way exhaust pipe 21, which increases the air in piston cylinder 26. This causes the elastic piston shaft 28 and pressing plate 29 to descend, making pressing plate 29 contact with rotating rod 30. At this time, the rotation speed of rotating rod 30 decreases, which reduces the movement speed of the blank between grinding roller 4 and drive roller 5.

[0025] Both the one-way exhaust pipe 21 and the one-way exhaust pipe 25 consist of a one-way exhaust valve and a round pipe; the one-way intake pipe 20 consists of a one-way intake valve and a round pipe. The air in the piston cylinder 19 can only be discharged through the one-way exhaust pipe 21 and the one-way exhaust pipe 25, and can only enter through the one-way intake pipe 20. The one-way exhaust valve can be configured with a valve body with high resistance.

[0026] The pressing assembly includes a piston cylinder 26, a slow venting valve 27, an elastic piston shaft 28, and a pressing plate 29; the top end of the piston cylinder 26 is connected to the bottom of the one-way vent pipe 25; the slow venting valve 27 is installed on the top of the piston cylinder 26; the top end of the elastic piston shaft 28 is connected to the top of the inner cavity of the piston cylinder 26, and the bottom end passes through the piston cylinder 26 and connects to the pressing plate 29; the pressing plate 29 is located above the rotating rod 30.

[0027] The grinding mechanism includes a protective shell 2, a drive device 3, a grinding roller 4, a drive roller 5, a support part 6, and a spraying part 8; there are two protective shells 2 and two drive devices 3; both protective shells 2 are installed above the support platform 1, and the two drive devices 3 are respectively installed on the two protective shells 2; the grinding roller 4 and the drive roller 5 are respectively installed inside the two protective shells 2, and the grinding roller 4 and the drive roller 5 are respectively installed on the output shafts of the two drive devices 3; the support part 6 is installed on the top of the support platform 1 and is located between the grinding roller 4 and the drive roller 5; the spraying part 8 is installed on the protective shell 2, and the spraying end faces the grinding roller 4.

[0028] Drive device 1 3 can be a motor; drive device 2 9 can be a cylinder; elastic element 1 11, elastic element 2 22 and elastic element 3 are all composed of springs and telescopic rods.

[0029] A cylinder can be installed on the support platform 1. The driving end of the cylinder is connected to the mounting shell 7, thereby driving the mounting shell 7 to rise and fall, so that the rotating rod 30 can rise and fall to contact the blank.

[0030] In summary, in this invention, the height of the support part 6 is adjusted, and then the blank is placed above the support part 6 between the grinding roller 4 and the drive roller 5. Then, the drive device 3 is started to drive the grinding roller 4 and the drive roller 5 to rotate. The rotation of the grinding roller 4 and the drive roller 5 transports the blank and grinds the rotating surface of the blank. Then, the cylinder can be started to drive the mounting shell 7 to descend, so that the rotating rod 30 presses on the blank. The blank will drive the rotating rod 30 to rotate, and the rotating rod 30 limits the blank, preventing the blank from tilting upward.

[0031] Taking the accompanying drawings as an example, when the second drive device 9 is started, the mounting plate 10, the elastic element 11 and the lifting part 12 are raised, so that the pressing part 13 is separated from the locking wheel 16. Then the grinding roller 4 rotates, and the second drive device 9 drives the lifting part 12 to descend, so that the grinding roller 4 and the polishing roller 17 are in contact. The rotation of the grinding roller 4 drives the polishing roller 17 to rotate.

[0032] When the grinding roller 17 rotates, it drives the striking part 15 to rotate. The striking part 15 intermittently pushes the movable part 14 upward, which in turn drives the pressing part 13, the lifting part 12 and the lifting piston shaft 18 to rise. When the lifting piston shaft 18 rises in the piston cylinder 19, it draws external air into the piston cylinder 19 through the one-way air inlet pipe 20. At the same time, the elastic element 11 is compressed. When the movable part 14 separates from the striking part 15, the elasticity of the elastic element 11 drives the lifting part 12 to fall. At this time, it drives the lifting piston shaft 18 to fall in the piston cylinder 19. Since the lifting piston shaft 18 is driven to fall by the elasticity of the elastic element 11, the falling force is low. Furthermore, the air in the piston cylinder 19 is slowly discharged from the one-way air outlet pipe 21 due to its own resistance, thereby preventing the movable part 14 from falling rapidly.

[0033] When the grinding performance of the grinding roller 4 decreases, some slippage occurs between the grinding roller 4 and the grinding roller 17, which slows down the rotation speed of the grinding roller 17. At this time, the frequency of the striking part 15 striking and pushing the moving part 14 upward also decreases. The distance of the moving part 14 descending increases, which causes the lifting piston shaft 18 to pass over the one-way air outlet pipe 21 and drive the one-way air outlet pipe 21 to press down the lifting plate 23 and separate it from the sealing ring 24. At this time, the lifting piston shaft 18 transports the air in the piston cylinder 19 from the one-way air outlet pipe 25 to the piston cylinder 26. When the rotation speed of the grinding roller 17 does not decrease too much, the frequency of the lifting piston shaft 18 descending over the one-way air outlet pipe 21 is low. At this time, the air entering the elastic piston shaft 28 will also be discharged from the slow ventilation valve 27.

[0034] As the grinding roller 4 gradually becomes smoother, the frequency at which the lifting piston shaft 18 descends past the one-way air outlet pipe 21 increases, causing the air entering the piston cylinder 26 to be faster than the air exiting through the slow vent valve 27. This causes the pressing plate 29 to gradually descend until it comes into contact with the rotating rod 30, thereby reducing the rotation speed of the rotating rod 30. The resistance applied by the rotating rod 30 to the blank slows down the speed at which the blank passes between the grinding roller 4 and the drive roller 5.

[0035] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A grinding device for machining micro motor shafts, comprising a support table (1) and a grinding mechanism, characterized in that, Also includes: The testing mechanism is mounted on the grinding mechanism; A damping mechanism, which is mounted on the detection mechanism and used to decelerate the billet; The detection mechanism includes a mounting shell (7), a detection component, a drive component, a pressing component, and a damping component; the mounting shell (7) is mounted on the grinding mechanism; the detection component is mounted inside the mounting shell (7) and is used to detect the grinding effect of the grinding mechanism; the drive component is mounted inside the mounting shell (7) and is used to drive the pressing component to move; the pressing component is mounted on the drive end of the drive component and is used to press the detection component; the damping component is mounted inside the mounting shell (7) and is used to slow down the descent speed of the pressing component; the detection component is attached to the rotating end of the grinding mechanism and rotates with it.

2. The grinding device for machining a micro motor shaft according to claim 1, characterized in that, The detection assembly includes a striking part (15), a retaining wheel (16), and a grinding roller (17); the striking part (15) is rotatably connected inside the mounting housing (7); the retaining wheel (16) is mounted on the striking part (15); the grinding roller (17) is mounted on the retaining wheel (16); and the grinding roller (17) is in contact with the surface of the rotating end of the grinding mechanism.

3. The grinding device for machining a micro motor shaft according to claim 1, characterized in that, The drive assembly includes a second drive device (9), a mounting plate (10), and an elastic element (11); the second drive device (9) is installed inside the mounting housing (7); the mounting plate (10) is installed at the drive end of the second drive device (9); the two ends of the elastic element (11) are connected to the pressing assembly and the mounting plate (10), respectively.

4. The grinding device for machining a micro motor shaft according to claim 3, characterized in that, The pressing assembly includes a lifting part (12), a pressing part (13), and a movable part (14); the lifting part (12) is installed on the movable end of the drive assembly; the pressing part (13) and the movable part (14) are both installed on the bottom end of the lifting part (12); the locking wheel (16) is located on the descending path of the pressing part (13); the striking part (15) is located on the descending path of the movable part (14).

5. A grinding device for machining a micro motor shaft according to claim 4, characterized in that, The damping assembly includes a lifting piston shaft (18), a piston cylinder (19), and a one-way exhaust pipe (21); the piston cylinder (19) is installed inside the mounting housing (7); the top end of the lifting piston shaft (18) is connected to the lifting part (12), and the bottom end is movably sleeved inside the piston cylinder (19); the one-way exhaust pipe (21) is installed on the side of the piston cylinder (19).

6. A grinding device for machining a micro motor shaft according to claim 5, characterized in that, The damping mechanism includes a rotating rod (30), a pressing assembly, and a control assembly; the rotating rod (30) is mounted on the bottom of the mounting housing (7); the control assembly is mounted on the bottom of the piston cylinder (19); the pressing assembly is connected to the control assembly and is used to press down the rotating rod (30).

7. A grinding device for machining a micro motor shaft according to claim 6, characterized in that, The control components include a one-way vent pipe (21), an elastic element (22), a lifting plate (23), a sealing ring (24), and a one-way vent pipe (25). The one-way vent pipe (25) is installed at the bottom of the piston cylinder (19). The one-way vent pipe (21) is installed at the bottom of the lifting piston shaft (18). The two ends of the elastic element (22) are connected to the inner cavity of the one-way vent pipe (25) and the lifting plate (23), respectively. The lifting plate (23) is located on the descending path of the one-way vent pipe (21). The one-way vent pipe (21) is separated from the lifting plate (23). The elasticity of the elastic element (22) causes the lifting plate (23) to fit against the sealing ring (24).

8. A grinding device for machining a micro motor shaft according to claim 7, characterized in that, The pressing assembly includes piston cylinder two (26), slow vent valve (27), elastic piston shaft (28) and pressing plate (29); the top of piston cylinder two (26) is connected to the bottom of one-way vent pipe two (25); the slow vent valve (27) is installed on the top of piston cylinder two (26); the top of elastic piston shaft (28) is connected to the top of the inner cavity of piston cylinder two (26), and the bottom end passes through piston cylinder two (26) and connects to pressing plate (29); pressing plate (29) is located above rotating rod (30).

9. A grinding device for machining a micro motor shaft according to claim 1, characterized in that, The grinding mechanism includes a protective shell (2), a drive device (3), a grinding roller (4), a drive roller (5), a support (6), and a spraying part (8); there are two protective shells (2) and two drive devices (3); the two protective shells (2) are installed above the support platform (1), and the two drive devices (3) are installed on the two protective shells (2) respectively; the grinding roller (4) and the drive roller (5) are installed inside the two protective shells (2), and the grinding roller (4) and the drive roller (5) are installed on the output shafts of the two drive devices (3) respectively; the support (6) is installed on the top of the support platform (1) and is located between the grinding roller (4) and the drive roller (5); the spraying part (8) is installed on the protective shell (2), and the spraying end faces the grinding roller (4).

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