Motor structure for sanding machine

Abstract

The present invention relates to the technical field of motor tools, and specifically discloses a motor structure for a sanding machine. It is aimed at the problem that the heat dissipation effect of existing motors gradually deteriorates as the working load of the motor increases during operation. It comprises: the motor, which is provided with a plurality of first heat conducting plates; a housing, which is installed on the motor, and there is a gap between the housing and the motor, and a through hole is provided on the side of the housing away from the motor, and a rotating shaft is provided on the non-driving end of the output shaft of the motor, and the rotating shaft penetrates the housing and is rotatably connected to the housing; a fan, which is fixed to the rotating shaft; a sliding ring, which is slidably provided in the housing, and the sliding ring is provided with a frustum. The present invention controls the gap of the air outlet to accelerate the flow rate of the exhaust gas, thereby improving the heat dissipation of the motor, thereby ensuring that the temperature on the motor is at an appropriate temperature when the motor works under different loads, thereby extending the service life of the motor.

Description

Technical Field

[0001] The present invention relates to the technical field of motor tools, and in particular to a motor structure for a sanding machine. Background Art

[0002] Sanders are widely used in woodworking, metal finishing, and other surface finishing applications. A motor drives the sanding disc to rotate at high speed, polishing the workpiece surface. However, when working with workpieces of varying materials or shapes, existing sanders can experience load fluctuations, causing the motor speed to deviate from its rated operating conditions. Traditional designs often connect the cooling fan directly to the motor output shaft, allowing the motor to drive the fan during operation and direct airflow to dissipate heat. This makes cooling efficiency highly dependent on the motor's actual operating speed. Therefore, under high load conditions, the motor may be underdriven, causing the cooling fan speed to drop. This in turn reduces the fan's airflow, preventing it from effectively dissipating heat generated within the motor and causing the temperature to rise. Long-term operation in this mismatched state (low fan speed under high load) exposes the motor to prolonged high temperatures, accelerating the aging of the motor winding insulation, causing bearing lubrication failure, and increasing core losses. It also significantly reduces the reliability and service life of the equipment. Summary of the Invention

[0003] In order to overcome the technical problems raised in the above background technology, the present invention provides a motor structure for a sanding machine.

[0004] Technical solution: A motor structure for a sanding machine, comprising:

[0005] The motor is provided with a plurality of first heat conducting plates;

[0006] a housing mounted on the motor, with a gap between the housing and the motor, a through hole being provided on a side of the housing away from the motor, a rotating shaft being provided on a non-driving end of an output shaft on the motor, the rotating shaft penetrating the housing and being rotatably connected thereto;

[0007] a fan, fixedly connected to the rotating shaft;

[0008] A sliding ring is slidably arranged in the shell, the sliding ring is provided with a round table surface, and the sliding ring is located between the motor and the fan.

[0009] Preferably, a plurality of protrusions are provided on a side of the housing away from the motor, and the protrusions of the housing are used to prevent impurities from completely blocking the through holes thereon.

[0010] 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 sliding ring, the fixed tube and the first sliding push rod form a chamber filled with a medium, and the volume of the medium responds linearly with temperature changes.

[0011] As a preference, it also includes:

[0012] a fixed block, fixedly connected to the first sliding push rod, and provided with a plurality of blind holes;

[0013] A sliding column is 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 frustum, and the frustum end of the sliding column is located in the corresponding blind hole on the fixed block.

[0014] Preferably, a side of the fixing block close to the sliding column is inclined, and the distance between the multiple blind holes on the fixing block and the central axis of the fixing tube changes linearly.

[0015] As a preference, it also includes:

[0016] There are multiple second heat conducting plates, which are arranged between two adjacent first heat conducting plates. The distance between the second heat conducting plates and the motor becomes smaller from one side close to the sliding ring to the other side.

[0017] Preferably, the closer to the sliding ring, the smaller the distance between two adjacent second heat conducting plates in the direction of the central axis of the motor.

[0018] As a preference, it also includes:

[0019] A spline rod is provided on the rotating shaft in a limited sliding manner, 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;

[0020] a sliding block, the sliding block being slidably disposed in the rotating shaft and having a spring installed between the sliding block and the spline rod;

[0021] The threaded rod is threadedly arranged on the rotating shaft and contacts the sliding block. The sliding block and the threaded rod are both provided with magnets, and the two magnets attract each other.

[0022] Preferably, the threaded rod is provided with a turntable, the rotating shaft is slidingly provided with a limit rod, and the limit rod penetrates the turntable of the threaded rod and slides.

[0023] As a preference, it also includes:

[0024] A liquid guide housing is fixedly connected to the inner wall of the housing and is located on the outer side of the rotating shaft for sealed rotation. The side wall of the rotating shaft is provided with a liquid guide hole communicating with the liquid guide housing;

[0025] a fixed shell, fixedly connected to the inner wall of the shell, and the liquid-conducting shell and the fixed shell are connected through a pipeline;

[0026] a second sliding push rod, slidably disposed in the fixed housing, wherein the fixed housing and the liquid-conducting housing are both filled with a liquid medium;

[0027] a fixed plate fixedly connected to the inner wall of the housing, wherein a sliding plate is slidably provided on the fixed plate, and a tension spring is installed between the sliding plate and the housing, and the sliding plate is used to press the second sliding push rod;

[0028] A fixing rod is fixedly connected to the sliding ring, and the fixing rod is used to press the sliding plate.

[0029] 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, thereby achieving the purpose of heat dissipation of the motor with different intensities under different load working conditions, so that the motor is at an appropriate temperature during operation, thereby extending its effective working time and service life; utilizing the limiting function of the sliding column to avoid frequent changes in the gas flow rate caused by frequent movement of the sliding ring and generating gas noise, thereby improving its working stability; utilizing the second heat conducting plate to guide the airflow, thereby further accelerating the gas flow rate, so that the gas can relatively evenly dissipate heat and cool the outer surface of the motor; by changing the positional relationship of the spline rod, the fan of the device is in different working states under different temperature environments, ensuring that the motor is at an appropriate temperature, thereby further extending the service life of the device; utilizing the movement of the fixed rod to trigger the spline rod to connect with the output shaft on the motor, thereby automatically starting the fan when the motor temperature is too high, dissipating heat from the motor, and achieving the effect of protecting the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0031] Figure 2 It is a schematic diagram of the three-dimensional structure of the fan and the sliding ring of the present invention;

[0032] Figure 3 A cross-sectional view of the housing and fan of the present invention;

[0033] Figure 4 A cross-sectional view of the rotating shaft and the sliding ring of the present invention;

[0034] Figure 5 It is a cross-sectional view of the fixed tube and the first sliding push rod of the present invention;

[0035] Figure 6An exploded view of the sliding ring and the second heat conducting sheet of the present invention;

[0036] Figure 7 This is a schematic diagram of the three-dimensional structure of the sliding block and the threaded rod of the present invention;

[0037] Figure 8 It is a schematic diagram of the three-dimensional structure of the fixed plate and the sliding plate of the present invention.

[0038] Explanation of the accompanying reference numerals: 1. Motor, 2. First heat conducting plate, 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 plate, 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. Fixed plate, 20. Sliding plate, 21. Fixed rod. DETAILED DESCRIPTION

[0039] The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which presently preferred embodiments of the invention are shown. However, the invention can 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 will fully convey the scope of the invention to those skilled in the art.

[0040] Example 1: A motor structure for a sanding machine, such as Figure 1-Figure 3 and Figure 5 As shown, it includes: a motor 1, which is provided with multiple first heat-conducting plates 2; a shell 3, which is installed on the motor 1, and there is a gap between the shell 3 and the motor 1, and a through hole is provided on the side of the shell 3 away from the motor 1, and a rotating shaft 4 is provided on the non-driving end of the output shaft of the motor 1, and the rotating shaft 4 penetrates the shell 3 and is rotatably connected thereto; a fan 5, which is fixed to the rotating shaft 4; a sliding ring 6, which is slidably arranged in the shell 3, and the sliding ring 6 is provided with a frustum, and the sliding ring 6 is located between the motor 1 and the fan 5; a plurality of protrusions are provided on the side of the shell 3 away from the motor 1, and the protrusions of the shell 3 are used to prevent impurities from completely blocking the through holes thereon; a fixed tube 7 is fixed to the motor 1, and a first sliding push rod 8 is slidably arranged in the fixed tube 7, and the first sliding push rod 8 is fixed to the sliding 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 the medium responds linearly with temperature changes.

[0041] In the above scheme, the first heat conducting plate 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, and improves the heat dissipation effect. At the same time, the first heat conducting plate 2 can prevent the motor 1 from being damaged when it is bumped. Two conical surfaces are provided on the inner side of the sliding ring 6, and the diameters of the two ends of the inner side of the sliding ring 6 are smaller than the middle part. When the sliding ring 6 moves to the right to the extreme position, the sliding ring 6 contacts the first heat conducting plate 2. At this time, there is still a gap between the sliding ring 6 and the motor 1.

[0042] like Figure 5 As shown, it also includes: a fixed block 9, which is 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, which is slidably set on the fixed tube 7, and a tension spring is installed between the sliding column 10 and the fixed tube 7, and the sliding column 10 is provided with a frustum, and the frustum 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 distance between the plurality of blind holes on the fixed block 9 and the central axis of the fixed tube 7 changes linearly.

[0043] In the above scheme, there are four blind holes on the upper surface of the fixed block 9, which are arranged in a truncated cone shape. The four blind holes on the fixed block 9 are distributed at equal intervals, and the connecting line of the four blind holes is inclined relative 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.

[0044] Specific working principle: After the device is assembled into the existing sanding machine, the sanding machine is started 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 drives the air to flow to the right, so that the gas flows through the through hole in the shell 3 to the gap between the sliding ring 6 and the motor 1. The subsequent gas continues to flow to the right through the surface of the first heat conducting plate 2 and the outer surface of the motor 1. The flowing gas carries away the heat from the first heat conducting plate 2 and the motor 1, thereby cooling the motor 1, keeping the motor 1 at a suitable temperature, and extending its effective working time and service life.

[0045] When the parts processed by the sanding machine are too rough, the load on the sanding machine becomes larger, which slows down the speed of the output shaft on the motor 1 and generates more heat. However, due to the slowdown in the speed of the output shaft on the motor 1, the speed of the fan 5 also slows down. In this process, the heat dissipation 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 transmitted to the medium in the fixed tube 7. At this time, the temperature of the medium in the fixed tube 7 rises and causes it to expand. The expansion trend of the medium exerts an extrusion force on the first sliding push rod 8. When the extrusion 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, and the fixed block 9 squeezes the sliding column 10 to move. The sliding column 10 moves and stretches the connected tension spring. After the sliding column 10 is re-aligned with the blind hole on the fixed block 9, 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.

[0046] 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 also drives the sliding ring 6 to move to the right. The sliding ring 6 moves to the right so that the gap between it and the motor 1 becomes smaller. At this time, the flow rate of the flowing gas will accelerate after passing through the small gap. The fast-flowing gas continues to flow to the right to efficiently dissipate heat to the outer surface of the motor 1 and the first heat conducting plate 2, thereby avoiding excessive temperature increase of the motor 1 under heavy load, thereby protecting the motor 1 and extending its service life.

[0047] 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 step of moving to the right, and the gas flow rate is increased again, that is, the heat dissipation effect is enhanced. When the load on the sanding machine 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 in the opposite direction and reset, and the sliding column 10 is reset at the same time. When the workpiece is finished, the motor 1 can be turned off.

[0048] During the movement of the sliding ring 6, the limiting effect of the sliding column 10 can effectively prevent the reciprocating movement of the sliding ring 6 from causing frequent changes in gas flow rate and generating gas noise due to fluctuations in load, thereby improving the working stability of the device.

[0049] Example 2: Based on Example 1, Figure 2 and Figure 6 As shown, it also includes: a second heat conducting plate 11, which has multiple pieces and is arranged between two adjacent first heat conducting plates 2. The distance between the second heat conducting plate 11 and the motor 1 becomes smaller from one side close to the slip ring 6 to the other side; the closer to the slip 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.

[0050] In the above scheme, the right end of the second heat conducting plate 11 is closer to the outer surface of the motor 1 relative to its left end. The setting of the second heat conducting plate 11 further increases the contact area between the device and the outside air, which facilitates to accelerate the heat dissipation of the device. At the same time, the setting of the second heat conducting plate 11 during the above-mentioned heat dissipation process of the device, the gas ejected from the gap between the sliding ring 6 and the motor 1 is further accelerated under the guidance of the second heat conducting plate 11, ensuring that the flowing gas covers the outer surface of the motor 1 as much as possible, thereby achieving uniform cooling of the motor 1 as a whole, keeping the temperature on the motor 1 relatively uniform, and avoiding local damage to the motor 1 due to excessive temperature.

[0051] Example 3: Based on Example 2, Figure 3 、 Figure 4 and Figure 7 As shown, it also includes: a spline rod 12, which is slidingly arranged on the rotating shaft 4 in a limited manner, a spline groove is provided 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 is slidingly 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 threadedly arranged on the rotating shaft 4 and in contact with the sliding block 13, and magnets are provided on 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 limit rod 15 is slidingly provided on the rotating shaft 4, and the limit rod 15 penetrates the turntable of the threaded rod 14 and slides.

[0052] In the above scheme, the spline rod 12 is 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 and the rotating shaft 4 on the motor 1. The limit 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.

[0053] Specific working principle: When the device is used under low external temperature, the external temperature contacts the outer surface of the motor 1 for natural heat transfer. In this state, the motor 1 can be controlled to be at an appropriate temperature. If the fan 5 is still used to rotate for heat dissipation in this link, it is easy to make the temperature on the motor 1 too low, affecting the normal operation of the motor 1. At this time, when the operator starts the device, he first pulls the limit rod 15 to the left to disengage the limit rod 15 from the rotating shaft 4, and then holds the turntable to rotate the threaded rod 14. The threaded rod 14 will move to the left, and 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 limit rod 15. At this time, the rotation of the output shaft of the motor 1 will not drive the spline rod 12 to rotate. The device can be started to work subsequently. When it is necessary to use the fan 5 to rotate for heat dissipation, repeat the above reverse operation to reinsert the spline rod 12 into the spline groove of the output shaft on the motor 1.

[0054] Example 4: Based on Example 3, Figure 4 and Figure 8 As shown, it also includes: a liquid guide shell 16, which is fixed to the inner wall of the shell 3 and is located on the outside of the rotating shaft 4 for sealed rotation. The side wall of the rotating shaft 4 is provided with a liquid guide hole connected to the liquid guide shell 16; a fixed shell 17, which is fixed 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 is slidably set in the fixed shell 17, and the fixed shell 17 and the liquid guide shell 16 are both filled with liquid medium; a fixed plate 19, which is fixed to the inner wall of the shell 3, and the fixed plate 19 is slidably provided with a sliding plate 20, and a tension spring is installed between the sliding plate 20 and the shell 3, and the sliding plate 20 is used to squeeze the second sliding push rod 18; a fixed rod 21, which is fixed to the sliding ring 6, and the fixed rod 21 is used to squeeze the sliding plate 20.

[0055] In the above scheme, a sealing ring is provided on the contact side of the liquid guide shell 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 is disengaged from the spline groove of the output shaft on the motor 1 by rotating the threaded rod 14, the working fan 5 of the device will not rotate at this time. However, as the device continues to work and the external temperature gradually rises, the temperature on 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. When the temperature of the motor 1 is high enough to allow the sliding ring 6 to move right to the right limit of its moving range. The sliding ring 6 drives the fixed rod 21 to move together at the same time, and the fixed rod 21 squeezes the sliding plate 20 to move right and stretches the tension spring connected to the sliding plate 20. The sliding plate 20 moves and squeezes the second sliding push rod 18 to move. The second sliding push rod 18 moves to inject the liquid in the fixed shell 17 into the gap between the rotating shaft 4 and the threaded rod 14 through the conduit and the liquid guide shell 16. The subsequent liquid squeezes the sliding block 13 to move right, and the magnet on the sliding block 13 is out of contact with the magnet on the threaded rod 14. The sliding block 13 moves right and squeezes the spline rod 12 to move right through the connected spring. Under the rotation action of the output shaft on 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 output shaft of the motor 1 rotates through the spline rod 12 and the rotating shaft 4 to drive the fan 5 to rotate together, realizing automatic emergency heat dissipation of the motor 1 in the case of no one management, further protecting the motor 1 and extending the service life of the motor 1.

[0056] The above description is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field can easily think of changes or replacements within the technical scope disclosed by the present invention, which should be covered by the scope of protection of the present invention.

Claims

1. A motor structure for a sanding machine, characterized in that: Includes: A motor (1), wherein a plurality of first heat conducting plates (2) are provided 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 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) 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, and the sliding ring (6) is located between the motor (1) and the fan (5); The motor (1) is fixedly connected to a fixed tube (7), a first sliding push rod (8) is slidably provided 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 temperature changes; A fixed block (9) is 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) is 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 frustum, and the frustum end of the sliding column (10) is located in a 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 distance between the multiple blind holes on the fixed block (9) and the central axis of the fixed tube (7) changes linearly.

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. The motor structure for a sanding machine according to claim 1, characterized in that: Also included are: There are multiple second heat conducting plates (11) arranged 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.

4. A motor structure for a sanding machine according to claim 3, 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).

5. The motor structure for a sanding machine according to claim 1, characterized in that: Also included are: A spline rod (12) is provided on the rotating shaft (4) in a limited sliding manner, a spline groove is provided 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.

6. The motor structure for a sanding machine according to claim 5, 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.

7. The motor structure for a sanding machine according to claim 5, characterized in that: Also included are: A liquid guide housing (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 communicating with the liquid guide housing (16); A fixed shell (17) is fixedly connected to the inner wall of the housing (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 fixed 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); and 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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