Motor structure for sander

Abstract

The invention relates to the technical field of motor tools, and particularly discloses a motor structure for a sanding machine. The problem that in the working process of an existing motor, the heat dissipation effect gradually becomes poor along with increasing of the working load of the motor is solved. Comprising a motor which is provided with a plurality of first heat-conducting fins; the shell is installed on the motor, a gap exists between the shell and the motor, a through hole is formed in the side, away from the motor, of the shell, a rotating shaft is arranged at the non-driving end of an output shaft on the motor, and the rotating shaft penetrates through the shell and is rotationally connected with the shell; the fan is fixedly connected to the rotating shaft; the sliding ring is arranged in the shell in a sliding mode, and the sliding ring is provided with a circular truncated cone face. The flow rate of exhausted gas is increased by controlling the gap of the air outlet, heat dissipation of the motor is improved, and therefore it is ensured that the temperature of the motor is appropriate when the motor works under different loads, and the service life of the motor is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of motor tools, and particularly to a motor structure for a sander. Background Art

[0002] A sander is a mechanical device widely used in wood processing, metal surface treatment, and other material surface grinding. It drives a sanding disc to rotate at a high speed through a motor to achieve grinding of the workpiece surface. However, in the existing sander, when processing workpieces of different materials or shapes, due to load fluctuations, the motor speed will deviate from its rated operating conditions. In traditional designs, a cooling fan is often directly connected to the motor output shaft, so that the motor drives the cooling fan to rotate during operation to guide air flow for heat dissipation of the motor. This makes the heat dissipation efficiency highly dependent on the actual operating speed of the motor. Therefore, under high load conditions, the motor may cause the cooling fan speed to decrease due to insufficient drive, and then the air flow speed generated by the fan slows down, unable to effectively discharge the heat generated inside the motor, resulting in a temperature rise. Running for a long time in this mismatch state (when the motor is under high load and the fan speed connected to the motor is low), the motor works at a high temperature for a long time, which will not only accelerate the aging of the motor winding insulation, cause bearing lubrication failure, and increase core loss, but also seriously reduce the reliability and service life of the equipment. Summary of the Invention

[0003] In order to overcome the technical problems proposed in the above background art, the present invention provides a motor structure for a sander.

[0004] Technical Solution: A motor structure for a sander includes: The motor, on which a plurality of first heat conducting fins are provided; A housing, installed on the motor, there is a gap between the housing and the motor, a through hole is provided on the side of the housing away from the motor, a rotating shaft is provided at the non-driving end of the output shaft on the motor, and the rotating shaft penetrates the housing and is rotatably connected thereto; A fan, fixedly connected to the rotating shaft; A slip ring, slidably arranged in the housing, the slip ring is provided with a round table surface, and the slip ring is located between the motor and the fan.

[0005] Preferably, a plurality of protrusions are provided on the side of the housing away from the motor, and the protrusions of the housing are used to prevent impurities from completely blocking the through hole thereon.

[0006] Preferably, a fixed tube is fixedly connected to the motor, a first sliding push rod is slidably arranged in the fixed tube, the first sliding push rod is fixedly connected to the slip ring, and the fixed tube and the first sliding push rod form a chamber filled with a medium, and the volume of this medium changes linearly with temperature.

[0007] Preferably, it further includes: A fixed block, fixedly connected to the first sliding push rod, and a plurality of blind holes are provided on the fixed block; A sliding column, slidably arranged on the fixed tube, and a tension spring is installed between the sliding column and the fixed tube. The sliding column is provided with a conical surface, and the conical surface end of the sliding column is located in the corresponding blind hole on the fixed block.

[0008] Preferably, one side of the fixed block close to the sliding column is inclined, and the distances between the plurality of blind holes on the fixed block and the central axis of the fixed tube change linearly.

[0009] Preferably, it further includes: A plurality of second heat conducting sheets, arranged between two adjacent first heat conducting sheets, and the distance between the second heat conducting sheet and the motor becomes smaller from the side close to the sliding ring to the other side.

[0010] Preferably, the distance between two adjacent second heat conducting sheets in the direction of the central axis of the motor is smaller when closer to the sliding ring.

[0011] Preferably, it further includes: A spline rod, slidably arranged on the rotating shaft in a limited way. A spline groove is provided on the output shaft of the motor. The spline rod is located in the spline groove of the motor, and the rotating shaft is in contact with the output shaft of the motor; A sliding block, slidably arranged in the rotating shaft, and a spring is installed between the sliding block and the spline rod; A threaded rod, threadedly arranged on the rotating shaft and in contact with the sliding block. Magnets are provided on both the sliding block and the threaded rod, and the two magnets attract each other.

[0012] Preferably, the threaded rod is provided with a turntable, and a limiting rod is slidably arranged on the rotating shaft. The limiting rod penetrates and slides through the turntable of the threaded rod.

[0013] Preferably, it further includes: A liquid guide shell, fixedly connected to the inner wall of the shell, and sealed and rotated outside the rotating shaft. A liquid guide hole communicating with the liquid guide shell is provided on the side wall of the rotating shaft; A fixed shell, fixedly connected to the inner wall of the shell, and the liquid guide shell and the fixed shell are communicated through a pipeline; A second sliding push rod, slidably arranged in the fixed shell. The fixed shell and the liquid guide shell are both filled with a liquid medium; The fixing plate is fixedly connected to the inner wall of the housing. A sliding plate is slidably arranged on the fixing plate, and a tension spring is installed between the sliding plate and the housing. The sliding plate is used to squeeze the second sliding push rod; The fixing rod is fixedly connected to the sliding ring, and the fixing rod is used to squeeze the sliding plate.

[0014] The beneficial effects of the present invention are as follows: The present invention controls the gas flow rate through the movement of the sliding ring, so as to achieve the purpose of dissipating heat from the motor under different load working conditions with different intensities, making the motor operate at an appropriate temperature during the working process, and prolonging its effective working duration and service life; By using the limit of the sliding column, it is avoided that the frequent movement of the sliding ring causes frequent changes in the gas flow rate and generates gas noise, thereby improving its working stability; By using the guiding of the second heat conducting sheet to the air flow, the gas flow rate is further accelerated, so that the gas dissipates heat and cools the outer surface of the motor relatively evenly; By changing the positional relationship of the spline rod, it is convenient for the device to be in different working states of the fan under different temperature environments, ensuring that the motor is at an appropriate temperature and further prolonging the service life of the device; By using the movement of the fixing rod, the spline rod is triggered to be connected to the output shaft on the motor, so as to automatically start the fan to dissipate heat from the motor when the temperature of the motor is too high, achieving the effect of protecting the motor. Description of the Drawings

[0015] Figure 1 It is a three-dimensional structure schematic diagram of the present invention; Figure 2 It is a three-dimensional structure schematic diagram of the fan and the sliding ring of the present invention; Figure 3 It is a cross-sectional view of the housing and the fan of the present invention; Figure 4 It is a cross-sectional view of the rotating shaft and the sliding ring of the present invention; Figure 5 It is a cross-sectional view of the fixed tube and the first sliding push rod of the present invention; Figure 6 It is an exploded view of the sliding ring and the second heat conducting sheet of the present invention; Figure 7 It is a three-dimensional structure schematic diagram of the sliding block and the threaded rod of the present invention; Figure 8 It is a three-dimensional structure schematic diagram of the fixing plate and the sliding plate of the present invention.

[0016] Description of the reference numerals: 1. Motor, 2. First heat conducting sheet, 3. Housing, 4. Rotating shaft, 5. Fan, 6. Sliding ring, 7. Fixed tube, 8. First sliding push rod, 9. Fixed block, 10. Sliding column, 11. Second heat conducting sheet, 12. Spline rod, 13. Sliding block, 14. Threaded rod, 15. Limiting rod, 16. Liquid guiding shell, 17. Fixed shell, 18. Second sliding push rod, 19. Fixing plate, 20. Sliding plate, 21. Fixing rod. Detailed implementation mode

[0017] The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which the presently preferred embodiments of the invention are shown. However, the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided for thoroughness and completeness and fully convey the scope of the invention to those skilled in the art.

[0018] Example 1: A motor structure for a sander, as Figures 1-3 and Figure 5 shown, includes: a motor 1, on which a plurality of first heat-conducting fins 2 are arranged; a housing 3, mounted on the motor 1, there is a gap between the housing 3 and the motor 1, a through hole is provided on the side of the housing 3 away from the motor 1, a rotating shaft 4 is provided at the non-driving end of the output shaft on the motor 1, and the rotating shaft 4 penetrates the housing 3 and is rotatably connected thereto; a fan 5, fixedly connected to the rotating shaft 4; a slip ring 6, slidably arranged in the housing 3, the slip ring 6 is provided with a conical surface, and the slip ring 6 is located between the motor 1 and the fan 5; a plurality of protrusions are provided on the side of the housing 3 away from the motor 1, and the protrusions of the housing 3 are used to prevent impurities from completely blocking the through hole thereon; a fixed tube 7 is fixedly connected to the motor 1, a first sliding push rod 8 is slidably arranged in the fixed tube 7, the first sliding push rod 8 is fixedly connected to the slip ring 6, and the fixed tube 7 and the first sliding push rod 8 form a chamber filled with a medium, and the volume of this medium changes linearly in response to temperature.

[0019] In the above solution, the first heat-conducting fin 2 is made of die-cast aluminum alloy. This setting increases the surface area of the motor 1, facilitates more gas to contact the outer surface of the motor 1, improves the heat dissipation effect, and at the same time the first heat-conducting fin 2 can prevent the motor 1 from being damaged when bumped. Two conical surfaces are provided on the inner side of the slip ring 6, and the diameters of both ends of the inner side surface of the slip ring 6 are smaller than the middle part thereof. When the slip ring 6 moves to the extreme right position, the slip ring 6 contacts the first heat-conducting fin 2, and at this time there is still a gap between the slip ring 6 and the motor 1.

[0020] As Figure 5 shown, it further includes: a fixed block 9, fixedly connected to the first sliding push rod 8, and a plurality of blind holes are provided on the fixed block 9; a sliding column 10, slidably arranged on the fixed tube 7, and a tension spring is installed between the sliding column 10 and the fixed tube 7, the sliding column 10 is provided with a conical surface, and the conical surface end of the sliding column 10 is located in the corresponding blind hole on the fixed block 9; the side of the fixed block 9 close to the sliding column 10 is inclined, and the distances between the plurality of blind holes on the fixed block 9 and the central axis of the fixed tube 7 change linearly.

[0021] In the above solution, there are four blind holes on the upper surface of the fixed block 9. The blind holes are set in the shape of a frustum of a cone, and the four blind holes on the fixed block 9 are equally spaced. The connection line of the four blind holes is inclined with respect to the central axis of the fixed tube 7. The tension spring between the sliding column 10 and the fixed tube 7 is always in a stretched state, and the closer the sliding column 10 is to the blind hole on the left side of the fixed block 9, the greater the limiting force of the sliding column 10 on the fixed block 9.

[0022] Specific working principle: After assembling this device into an existing sander, the sander works by starting the motor 1. During the operation of the motor 1, the output shaft of the motor 1 drives the rotating shaft 4 and the fan 5 to rotate together. The fan 5 works to drive the air to flow to the right, so that the gas flows through the through hole in the housing 3 to the gap between the sliding ring 6 and the motor 1. Subsequently, the gas continues to flow to the right through the surface of the first heat conducting sheet 2 and the outer surface of the motor 1. The flowing gas carries away the heat on the first heat conducting sheet 2 and the motor 1, thereby achieving the cooling of the motor 1, keeping the motor 1 at an appropriate temperature, and prolonging its effective working duration and service life.

[0023] When the parts processed by the sander are too rough, the load on the sander during operation becomes larger, causing the rotation speed of the output shaft of the motor 1 to slow down. At the same time, the heat generated by the motor 1 increases. However, due to the slowdown of the rotation speed of the output shaft of the motor 1, the rotation speed of the fan 5 also slows down. During this process, the cooling effect of the flowing gas generated by the rotation of the fan 5 on the motor 1 becomes worse, causing the temperature of the motor 1 to rise. The temperature on the motor 1 is simultaneously transferred to the medium in the fixed tube 7. At this time, the temperature of the medium in the fixed tube 7 rises and causes an expansion tendency. The expansion tendency of the medium exerts a squeezing force on the first sliding push rod 8. When the squeezing force of the medium on the first sliding push rod 8 is greater than the limiting force of the sliding column 10 on the fixed block 9, the first sliding push rod 8 and the fixed block 9 move to the right. The fixed block 9 squeezes the sliding column 10 to move, and the sliding column 10 moves to stretch the connected tension spring. After the sliding column 10 is aligned with the blind hole on the fixed block 9 again, under the pulling force of the sliding column 10, the sliding column 10 is inserted into the blind hole of the fixed block 9 and limits it.

[0024] During the process of the first sliding push rod 8 and the fixed block 9 moving to the right, the first sliding push rod 8 simultaneously drives the sliding ring 6 to move to the right. The rightward movement of the sliding ring 6 reduces the gap between it and the motor 1. At this time, the flow rate of the gas will increase after passing through the small gap. The fast-flowing gas continues to flow to the right to efficiently dissipate heat from the outer surface of the motor 1 and the first heat conducting sheet 2, preventing the temperature of the motor 1 from rising excessively under a large load state, thereby achieving the effect of protecting the motor 1 and prolonging its service life.

[0025] If the temperature on the motor 1 still does not drop in this state, the temperature on the motor 1 is transferred to the medium in the fixed tube 7, and then the first sliding push rod 8 and the sliding ring 6 repeat the above-mentioned steps of moving to the right, strengthening the gas flow rate again, that is, strengthening the heat dissipation effect. When the load on the sander is restored, the temperature of the medium in the fixed tube 7 gradually decreases to the initial value under the heat dissipation effect. Subsequently, the first sliding push rod 8 drives the sliding ring 6 to move reversely to reset, and at the same time, the sliding column 10 resets. When the workpiece is polished, the motor 1 can be turned off.

[0026] During the movement of the sliding ring 6 above, the limiting effect of the sliding column 10 can effectively prevent the reciprocating movement of the sliding ring 6 caused by the fluctuating change of the load from resulting in frequent changes in the gas flow rate and generating gas noise, that is, improving the working stability of the device.

[0027] Embodiment 2: On the basis of Embodiment 1, as Figure 2 and Figure 6 shown, it further includes: a plurality of second heat conducting sheets 11, which are arranged between two adjacent first heat conducting sheets 2. The distance between the second heat conducting sheet 11 and the motor 1 becomes smaller from the side close to the sliding ring 6 to the other side; the distance between two adjacent second heat conducting sheets 11 in the axial direction of the motor 1 is smaller the closer it is to the sliding ring 6.

[0028] In the above solution, the right end of the second heat conducting sheet 11 is closer to the outer surface of the motor 1 than its left end. The arrangement of the second heat conducting sheet 11 further increases the contact area between the device and the outside air, facilitating the heat dissipation of the device. At the same time, during the heat dissipation process of the device above, the gas ejected from the gap between the sliding ring 6 and the motor 1 is guided by the second heat conducting sheet 11, so that the gas further accelerates the flow, ensuring that the flowing gas covers the outer surface of the motor 1 as much as possible, thereby realizing uniform cooling of the whole motor 1, keeping the temperature on the motor 1 relatively uniform, and preventing damage caused by excessive local temperature on the motor 1.

[0029] Embodiment 3: On the basis of Embodiment 2, as Figure 3 、 Figure 4 and Figure 7 shown, it further includes: a spline rod 12, which is slidably arranged on the rotating shaft 4 in a limiting manner. A spline groove is arranged on the output shaft of the motor 1, and the spline rod 12 is located in the spline groove of the motor 1, and the rotating shaft 4 is in contact with the output shaft of the motor 1; a sliding block 13, which is slidably arranged in the rotating shaft 4, and a spring is installed between the sliding block 13 and the spline rod 12; a threaded rod 14, which is threaded on the rotating shaft 4 and is in contact with the sliding block 13. Magnets are arranged on both the sliding block 13 and the threaded rod 14, and the two magnets attract each other; the threaded rod 14 is provided with a turntable, and a limiting rod 15 is slidably arranged on the rotating shaft 4, and the limiting rod 15 penetrates through the turntable of the threaded rod 14 and slides.

[0030] In the above solution, the spline rod 12 is made of high-strength alloy steel, which has the advantages of high strength, good toughness, wear resistance, etc. The high strength of the spline rod 12 can effectively improve the stability of power transmission between the output shaft on the motor 1 and the rotating shaft 4. The limiting rod 15 passes through the turntable and is inserted into the rotating shaft 4 to further prevent the threaded rod 14 from rotating relative to the rotating shaft 4.

[0031] Specific working principle: When the device is used under the condition of relatively low external temperature, when the external temperature contacts the outer surface of the motor 1 for natural heat transfer, the motor 1 can be controlled to be at an appropriate temperature in this state. If the fan 5 is still rotated for heat dissipation in this link, it is easy to make the temperature of the motor 1 too low, affecting the normal operation of the motor 1. At this time, when the operator starts the device, first pull the limiting rod 15 to the left to make the limiting rod 15 disengage from the rotating shaft 4. Then hold the turntable and rotate the threaded rod 14. The threaded rod 14 will move to the left. The magnet on the threaded rod 14 attracts the sliding block 13 to move to the left together. The sliding block 13 drives the spline rod 12 to move to the left through the connected spring, so that the spline rod 12 disengages from the spline groove of the output shaft on the motor 1 and resets the limiting rod 15. At this time, the rotation of the output shaft of the motor 1 will not drive the spline rod 12 to rotate, and then the device can be started to work. When it is necessary to use the fan 5 to rotate for heat dissipation, repeat the above reverse operation to insert the spline rod 12 back into the spline groove of the output shaft on the motor 1.

[0032] Embodiment 4: On the basis of Embodiment 3, as Figure 4 and Figure 8 shown, it further includes: a liquid guide shell 16, fixedly connected to the inner wall of the shell 3 and hermetically rotating outside the rotating shaft 4. A liquid guide hole communicating with the liquid guide shell 16 is provided on the side wall of the rotating shaft 4; a fixed shell 17, fixedly connected to the inner wall of the shell 3, and the liquid guide shell 16 and the fixed shell 17 are connected by a pipeline; a second sliding push rod 18, slidably arranged in the fixed shell 17. Both the fixed shell 17 and the liquid guide shell 16 are filled with a liquid medium; a fixing plate 19, fixedly connected to the inner wall of the shell 3. A sliding plate 20 is slidably arranged on the fixing plate 19, and a tension spring is installed between the sliding plate 20 and the shell 3. The sliding plate 20 is used to squeeze the second sliding push rod 18; a fixed rod 21, fixedly connected to the sliding ring 6, and the fixed rod 21 is used to squeeze the sliding plate 20.

[0033] In the above solution, a sealing ring is provided on the contact side of the liquid guide housing 16 and the rotating shaft 4 to improve the sealing between the two. The sliding plate 20 is provided with an inclined surface, and the inclined surface of the sliding plate 20 is inclined backward from left to right. The diameter of the sliding block 13 is larger than the maximum diameter of the threaded rod 14, that is, there is a gap between the threaded rod 14 and the rotating shaft 4. When the operator adjusts the device to the state where the spline rod 12 disengages from the spline groove of the output shaft of the motor 1 by rotating the threaded rod 14, the working fan 5 of the device will not rotate at this time. However, with the continuous operation of the device and the gradual rise of the external temperature, the temperature of the motor 1 may gradually increase. As the temperature rises, the temperature of the medium in the fixed tube 7 also rises. At this time, the medium gradually expands, and the above-mentioned working steps of the first sliding push rod 8 driving the sliding ring 6 to move will be repeated. During the process that the temperature of the motor 1 is high enough for the sliding ring 6 to move to the right limit of its moving range, the sliding ring 6 drives the fixed rod 21 to move together at the same time. The fixed rod 21 squeezes the sliding plate 20 to move to the right and stretches the tension spring connected to the sliding plate 20. The sliding plate 20 moves to squeeze the second sliding push rod 18 to move. The second sliding push rod 18 moves to inject the liquid in the fixed housing 17 into the gap between the rotating shaft 4 and the threaded rod 14 through the conduit and the liquid guide housing 16. Subsequently, the liquid squeezes the sliding block 13 to move to the right, and the magnet on the sliding block 13 disengages from the contact with the magnet on the threaded rod 14. The sliding block 13 moves to the right and squeezes the spline rod 12 to move to the right through the connected spring. Under the rotation of the output shaft of the motor 1, the spline rod 12 will be inserted into the spline groove of the output shaft on the spline rod 12. At this time, the rotation of the output shaft of the motor 1 drives the fan 5 to rotate together through the spline rod 12 and the rotating shaft 4, realizing automatic emergency heat dissipation of the motor 1 without human management, further protecting the motor 1, and extending the service life of the motor 1.

[0034] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, and all should be covered within the protection scope of the present invention.

Claims

1. A motor structure for a sanding machine, characterized in that: Included are: A motor (1), wherein a plurality of first heat conducting sheets (2) are arranged on the motor (1); A housing (3) is mounted on the motor (1), a gap exists between the housing (3) and the motor (1), a through hole is provided on a side of the housing (3) away from the motor (1), a rotating shaft (4) is provided on a non-driving end of an output shaft on the motor (1), and the rotating shaft (4) penetrates the housing (3) and is rotatably connected thereto; A fan (5) is fixedly connected to the rotating shaft (4); A sliding ring (6) is slidably arranged in the housing (3); the sliding ring (6) is provided with a round table surface; the sliding ring (6) is located between the motor (1) and the fan (5).

2. A motor structure for a sanding machine according to claim 1, characterized in that: A plurality of protrusions are provided on a side of the housing (3) away from the motor (1), and the protrusions of the housing (3) are used to prevent impurities from completely blocking the through holes thereon.

3. A motor structure for a sanding machine according to claim 1, characterized in that: The motor (1) is fixedly connected to a fixed tube (7), a first sliding push rod (8) is slidably arranged in the fixed tube (7), the first sliding push rod (8) is fixedly connected to the sliding ring (6), and the fixed tube (7) and the first sliding push rod (8) form a chamber filled with a medium, the volume of which responds linearly to changes in temperature.

4. A motor structure for a sanding machine according to claim 3, characterized in that: Also included are: A fixed block (9) fixedly connected to the first sliding push rod (8), wherein the fixed block (9) is provided with a plurality of blind holes; A sliding column (10) is slidably arranged on the fixed tube (7) and a tension spring is installed between the sliding column and the fixed tube (7). The sliding column (10) is provided with a round table surface, and the round table surface end of the sliding column (10) is located in a corresponding blind hole on the fixed block (9).

5. A motor structure for a sanding machine according to claim 4, characterized in that: The side of the fixed block (9) close to the sliding column (10) is arranged to be inclined, and the distance between the plurality of blind holes on the fixed block (9) and the central axis of the fixed tube (7) changes linearly.

6. The motor structure for a sanding machine according to claim 1, characterized in that: Also included are: A plurality of second heat conducting plates (11) are provided between two adjacent first heat conducting plates (2), and the distance between the second heat conducting plates (11) and the motor (1) decreases from one side close to the sliding ring (6) to the other side.

7. A motor structure for a sanding machine according to claim 6, characterized in that: The closer to the sliding ring (6), the smaller the distance between two adjacent second heat conducting plates (11) in the direction of the central axis of the motor (1).

8. The motor structure for a sanding machine according to claim 1, characterized in that: Also included are: A spline rod (12) is slidably disposed on the rotating shaft (4) in a limited manner, a spline groove is disposed on the output shaft of the motor (1), the spline rod (12) is located in the spline groove of the motor (1), and the rotating shaft (4) is in contact with the output shaft of the motor (1); a sliding block (13), the sliding block (13) being slidably disposed in the rotating shaft (4), and having a spring installed between the sliding block (13) and the spline rod (12); A threaded rod (14) is threadedly disposed on the rotating shaft (4) and is in contact with the sliding block (13); magnets are disposed on both the sliding block (13) and the threaded rod (14), and the two magnets attract each other.

9. A motor structure for a sanding machine according to claim 8, characterized in that: The threaded rod (14) is provided with a rotating disk, and the rotating shaft (4) is slidably provided with a limiting rod (15), and the limiting rod (15) penetrates the rotating disk of the threaded rod (14) and slides.

10. A motor structure for a sanding machine according to claim 8, characterized in that: Also included are: A liquid guide shell (16) is fixedly connected to the inner wall of the housing (3) and is located outside the rotating shaft (4) for sealed rotation. The side wall of the rotating shaft (4) is provided with a liquid guide hole that is in communication with the liquid guide shell (16); A fixed shell (17) is fixedly connected to the inner wall of the shell body (3), and the liquid-conducting shell (16) and the fixed shell (17) are connected via a pipeline; a second sliding push rod (18) slidably disposed in the fixed shell (17), wherein the fixed shell (17) and the liquid-conducting shell (16) are both filled with a liquid medium; A fixed plate (19) is fixedly connected to the inner wall of the housing (3); a sliding plate (20) is slidably provided on the fixed plate (19); a tension spring is installed between the sliding plate (20) and the housing (3); the sliding plate (20) is used to press the second sliding push rod (18); A fixing rod (21) is fixedly connected to the sliding ring (6), and the fixing rod (21) is used to press the sliding plate (20).

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