A low-noise variable-frequency speed-regulating air-conditioning motor

Abstract

The present invention discloses a low-noise variable-frequency speed-regulating air-conditioning motor, comprising a motor body, an auxiliary supporting mechanism arranged at one side of the output end of the motor body, and a dust-proof mechanism and a circulating lubrication mechanism located between the auxiliary supporting mechanism and the motor body, a plurality of mounting seats are connected to the side wall of the motor body, a transmission shaft is installed at the output end of the motor body, a rubber gasket is clamped on the motor body, the rubber gasket is clamped at the bottom of the transmission shaft, and the rubber gasket is used to prevent lubricant from entering the interior of the motor body; compared with the prior art, the present invention enables the transmission pressure rod to reciprocately squeeze the surface of the air pressure pad during the operation of the motor, thereby driving the hollow tube on one side to deform, and can transport the lubricant stored in the hollow tube to the annular cavity and guide it to the outside of the transmission shaft along the transmission groove, and when the hollow tube is reset, a small amount of lubricant can remain on the surface of the transmission shaft for oiling and lubrication.

Description

Technical Field

[0001] The invention relates to the technical field of motors, and in particular to a low-noise variable-frequency speed-regulating air-conditioning motor. Background Art

[0002] An air conditioning motor refers to an electric motor used to drive air conditioning equipment for cooling or heating. It is one of the most important components in the entire air conditioning system. Its main function is to output mechanical power to drive other parts of the air conditioning equipment to work normally.

[0003] During the operation of the air-conditioning motor, due to the long-term lack of maintenance, the internal noise is generated, which affects people's normal rest. During the operation of the air-conditioning motor, the air-conditioning motor often produces a buzzing noise due to the lack of oil inside the bearing or the position of the wind wheel. And with the drive of the airflow, dust is inevitably accumulated and adsorbed. Once the dust gathers near the bearing, it will not only cause the bearing to heat up easily, but also adsorb the lubricant inside the bearing, shortening the maintenance cycle of the air-conditioning motor and increasing the cost of use. For this reason, we propose a low-noise variable frequency speed regulation air-conditioning motor to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide a low-noise variable-frequency speed-regulating air-conditioning motor to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a low-noise variable frequency speed regulating air conditioner motor, comprising a motor body, an auxiliary support mechanism arranged at one side of the output end of the motor body, and a dust prevention mechanism and a circulating lubrication mechanism located between the auxiliary support mechanism and the motor body, a plurality of mounting seats are connected to the side wall of the motor body, a transmission shaft is installed at the output end of the motor body, a rubber gasket is clamped on the motor body, the rubber gasket is clamped at the bottom of the transmission shaft, the rubber gasket is used to prevent lubricant from entering the interior of the motor body, and a plurality of transmission grooves are opened on the surface of the rubber gasket;

[0006] The auxiliary support mechanism is clamped on one end of the transmission shaft and is used to abut against the wind wheel for auxiliary positioning. The dustproof mechanism and the circulating lubrication mechanism are clamped on the transmission shaft. The dustproof mechanism is clamped on the outside of the circulating lubrication mechanism, and the circulating lubrication mechanism abuts against one side of the rubber gasket. During the operation of the motor, the auxiliary support mechanism can abut against one side of the wind wheel for auxiliary support. At the same time, the dustproof mechanism prevents dust from flowing along the airflow to the output end of the motor body, thereby reducing abnormal noise of the bearing caused by dust accumulation. At the same time, during the operation of the motor, the circulating lubrication mechanism can be used to lubricate the connection between the motor transmission shaft and the motor body to prevent oil shortage and increased wear.

[0007] Preferably, the auxiliary support mechanism comprises a positioning tube and a clamping ring, a positioning groove is provided on the transmission shaft, the positioning tube is sleeved on the transmission shaft and limit bolts are inserted at both ends, and the limit bolts pass through the positioning groove, and the clamping ring is clamped on the top of the positioning tube;

[0008] The clamping ring is provided with a plurality of arc grooves, and a buffer rod is inserted inside the arc groove. A limiting pressure plate is installed on the top of the buffer rod. The limiting pressure plate can be pressed against one side of the wind wheel for auxiliary support, which can reduce the deviation during rotation caused by the falling of the internal blades of the wind wheel during use.

[0009] Preferably, a reset shaft is installed on the top of the limiting pressure plate, the cross-section of the reset shaft is "V"-shaped, and a plurality of compression balls are clamped inside the reset shaft. The reset shaft can squeeze the compression balls during the limiting process, and the compression balls squeeze each other, which is used to reduce vibration during use, ensure the stability of the wind wheel operation, and reduce noise. With the cooperation of the compression balls and the reset shaft, dust can be reduced from being adsorbed on the connection between the transmission shaft and the wind wheel under the action of airflow.

[0010] Preferably, the dustproof mechanism comprises a blocking cover, the blocking cover is clamped on the transmission shaft, and a rubber ring is installed on the side wall of the blocking cover.

[0011] Preferably, an annular groove is provided on the inner wall of the blocking cover, and sound-absorbing cotton is provided inside the annular groove, which can reduce the noise emitted by the motor body during operation, reduce the decibel level during use, and improve user experience.

[0012] Preferably, the circulating lubrication mechanism includes a connecting ring, a docking ring and a limiting tube. The connecting ring is opened on the transmission shaft and is located inside the dustproof mechanism. A circular groove is opened on the side of the connecting ring close to the motor body, and a sealing ring is clamped inside the circular groove. The docking ring is clamped inside the connecting ring, and the limiting tube is clamped inside the docking ring. An air pressure pad is clamped on the top of the sealing ring, and the bottom of the limiting tube rests on the air pressure pad. The inner diameter of the limiting tube is larger than the inner diameter of the sealing ring. The sealing ring can play an isolation role to prevent the internal lubricant from leaking out.

[0013] Preferably, one side of the docking ring is inclined, and an annular cavity is formed between the docking ring and the rubber gasket. A plurality of transmission grooves are opened at the bottom of the limiting tube, and the transmission grooves are used to communicate with the annular cavity. A plurality of circular holes are opened inside the limiting tube, and a transmission pressure rod is inserted into the circular hole. The bottom of the transmission pressure rod is against the air pressure pad, and an elastic block is installed on the top of the transmission pressure rod, and the position of the elastic block corresponds to the transmission groove. As the connecting ring rotates with the transmission shaft, the transmission pressure plate can be rotated, and the air pressure plate is squeezed with the cooperation of the transmission groove.

[0014] Preferably, the docking ring is provided with a plurality of limiting holes, and an adsorption shaft is installed inside the limiting holes, an annular groove is provided inside the adsorption shaft, a plurality of sponge sheets are arranged inside the annular groove in an annular array, and a plurality of transmission holes are provided inside the annular groove;

[0015] A hollow tube is installed on one side of the adsorption shaft, lubricant is stored in the hollow tube and the tube is connected with the transmission hole, the bottom of the hollow tube is clamped on the air pressure pad, and the hollow tube deforms with the air pressure pad to change the internal air pressure, which is used to assist in lubricating the transmission shaft. During the flow of the lubricant, the sponge board can be used to absorb and separate the internal dirt, so as to prevent debris and dirt from affecting the transmission at the connection between the transmission shaft and the motor body.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. In the process of motor operation, the present invention enables the transmission pressure rod to press against one side of the rubber gasket, and cooperates with the transmission groove to enable the transmission pressure rod to reciprocate and squeeze the surface of the air pressure pad, thereby driving the hollow tube on one side to deform, and the lubricant stored in the hollow tube can be transported to the annular cavity and guided to the outside of the transmission shaft along the transmission groove. When the hollow tube is reset, a small amount of lubricant can be left on the surface of the transmission shaft for oiling and lubrication;

[0018] 2. The present invention can adjust the position of the buffer rod when the wind wheel is supported, and the limit pressure plate is pressed against one side of the wind wheel, which can play a role of auxiliary support and reduce the situation where the wind wheel has a small deviation during the rotation process, resulting in loud noise inside the air conditioner;

[0019] 3. The present invention can compress the reset shaft to make the side walls collide with each other by means of compression between the compression balls, which can not only play a buffering role, but also prevent dust from entering the connection between the transmission shaft and the wind wheel, thereby extending the maintenance period of the equipment;

[0020] 4. The present invention can absorb dust and debris by means of the sponge sheet inside the annular groove during the circulation lubrication process, thereby ensuring smooth operation of the transmission shaft and extending the maintenance cycle of the motor;

[0021] 5. The present invention can prevent dust and the like from being directed to one side of the motor body and accumulate by means of a blocking cover, and block noise with the help of sound-absorbing cotton, thereby reducing the situation in which the noise during the operation of the air conditioner affects people's normal rest, and has a good user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the disassembly and assembly structure of one side of the motor body of the present invention;

[0024] Figure 3 For the present invention Figure 2 A schematic diagram of the partially enlarged structure at center A;

[0025] Figure 4 It is a schematic diagram of the structure of the auxiliary support mechanism of the present invention;

[0026] Figure 5 It is a partial cross-sectional schematic diagram of the reset shaft of the present invention;

[0027] Figure 6 This is a schematic diagram of the internal disassembly and assembly structure of the dustproof mechanism of the present invention;

[0028] Figure 7 For the present invention Figure 6 A partial enlarged schematic diagram of point B in the middle;

[0029] Figure 8 This is a schematic diagram of the disassembly and assembly structure of the circulating lubrication mechanism of the present invention;

[0030] Fig. 9 For the present invention Figure 8 A partial enlarged schematic diagram of point C in the middle;

[0031] In the figure: 1. Motor body; 2. Auxiliary support mechanism; 3. Dustproof mechanism; 4. Circulating lubrication mechanism; 11. Mounting seat; 12. Transmission shaft; 13. Rubber gasket; 131. Transmission groove; 21. Positioning tube; 22. Snap ring; 23. Buffering rod; 24. Limiting pressure plate; 25. Reset shaft; 251. Compression ball; 31. Blocking cover; 41. Connecting ring; 42. Sealing ring; 43. Air pressure pad; 44. Docking ring; 45. Hollow tube; 46. Adsorption shaft; 461. Annular groove; 47. Limiting tube; 471. Transmission groove; 472. Transmission pressure rod. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] See also Figure 1-Figure 9The present invention provides a technical solution: a low-noise variable frequency speed regulating air conditioner motor, comprising a motor body 1, an auxiliary support mechanism 2 arranged at one side of the output end of the motor body 1, and a dust prevention mechanism 3 and a circulating lubrication mechanism 4 located between the auxiliary support mechanism 2 and the motor body 1, a plurality of mounting seats 11 are connected to the side wall of the motor body 1, a transmission shaft 12 is installed at the output end of the motor body 1, a rubber gasket 13 is clamped on the motor body 1, the rubber gasket 13 is clamped at the bottom of the transmission shaft 12, the rubber gasket 13 is used to prevent lubricant from entering the inside of the motor body 1, and a plurality of transmission grooves 131 are opened on the surface of the rubber gasket 13;

[0034] The auxiliary support mechanism 2 is clamped on one end of the transmission shaft 12, and is used to rest on the wind wheel for auxiliary positioning. The dustproof mechanism 3 and the circulating lubrication mechanism 4 are clamped on the transmission shaft 12, and the dustproof mechanism 3 is clamped on the outside of the circulating lubrication mechanism 4, and the circulating lubrication mechanism 4 rests on one side of the rubber gasket 13. During the operation of the motor, the auxiliary support mechanism 2 can rest on one side of the wind wheel for auxiliary support. At the same time, the dustproof mechanism 3 prevents dust from flowing along the airflow to the output end of the motor body 1, thereby reducing abnormal bearing noise caused by dust accumulation. At the same time, during the operation of the motor, the circulating lubrication mechanism 4 can be used to lubricate the connection between the motor transmission shaft 12 and the motor body 1 to prevent oil shortage and increased wear.

[0035] like Figure 4 As shown, in order to ensure the stability of the wind wheel installation on one side of the motor body 1, the auxiliary support mechanism 2 includes a positioning tube 21 and a clamping ring 22. A positioning groove is opened on the transmission shaft 12. The positioning tube 21 is sleeved on the transmission shaft 12 and limit bolts are inserted at both ends. The limit bolts pass through the positioning groove, and the clamping ring 22 is clamped on the top of the positioning tube 21.

[0036] A plurality of arc grooves are provided on the clamping ring 22, and a buffer rod 23 is inserted inside the arc groove. A limiting pressure plate 24 is installed on the top of the buffer rod 23. The limiting pressure plate 24 can be pressed against one side of the wind wheel for auxiliary support. The limiting pressure plate 24 can be pressed against one side of the wind wheel for auxiliary limiting, so as to reduce the shaking or deviation of the internal wind wheel during rotation after the blades fall due to aging, thereby reducing the noise during use.

[0037] like Figure 5As shown, during use, dust adheres to the connection between the motor body 1 and the wind wheel, which may cause equipment performance degradation, aggravate wear, etc., a reset shaft 25 is installed on the top of the limiting pressure plate 24, and the cross-section of the reset shaft 25 is "V"-shaped. A plurality of compression balls 251 are clamped inside the reset shaft 25. The reset shaft 25 can squeeze the compression balls 251 during the limiting process, and the compression balls 251 squeeze each other, which is used to reduce vibration during use, ensure the stability of the wind wheel operation, and reduce noise. During the limiting process, the reset shaft 25 can be pressed against one side of the wind wheel to assist in limiting. At the same time, the reset shaft 25 can be fitted against one side of the wind wheel under the action of the compression balls 251 to assist in sealing and isolation and reduce the entry of dust.

[0038] like Figure 6 As shown, during use, dust easily adheres to the transmission shaft 12 along with the airflow, and the dust-proof mechanism 3 includes a blocking cover 31, which is clamped on the transmission shaft 12, and a rubber ring is installed on the side wall of the blocking cover 31. The blocking cover 31 can reduce the dust adsorbed on the bottom of the transmission shaft 12, thereby preventing the bearing from being aggravated in subsequent use.

[0039] In order to ensure the user experience of the air conditioner during use, an annular groove is opened on the inner wall of the blocking cover 31, and sound-absorbing cotton is opened inside the annular groove, which can reduce the noise emitted by the motor body 1 during operation and the noise during use, and can create a relatively comfortable rest environment for people in daily life.

[0040] like Figure 8 As shown, due to the lack of oil in the bearing during use, the wear is likely to be aggravated. The circulating lubrication mechanism 4 includes a connecting ring 41, a docking ring 44 and a limiting tube 47. The connecting ring 41 is opened on the transmission shaft 12 and is located inside the dustproof mechanism 3. A circular groove is opened on the side of the connecting ring 41 close to the motor body 1, and a sealing ring 42 is clamped inside the circular groove. The docking ring 44 is clamped inside the connecting ring 41, and the limiting tube 47 is clamped inside the docking ring 44. An air pressure pad 43 is clamped on the top of the sealing ring 42, and the bottom of the limiting tube 47 rests on the air pressure pad 43. The inner diameter of the limiting tube 47 is larger than the inner diameter of the sealing ring 42. The sealing ring 42 can play a blocking role, thereby reducing the leakage of the internal lubricant during the circular motion of the transmission shaft 12, and can reduce the unstable operation caused by this situation.

[0041] like Figure 7As shown, in order to reduce the lack of lubricant during the operation of the transmission shaft 12, which leads to the lack of sufficient lubrication and aggravated wear, one side of the docking ring 44 is inclined, and an annular cavity is formed between the docking ring 44 and the rubber gasket 13. A plurality of transmission grooves 471 are opened at the bottom of the limiting tube 47, and the transmission grooves 471 are used to pass through the annular cavity. A plurality of circular holes are opened inside the limiting tube 47, and a transmission pressure rod 472 is inserted into the circular hole. The bottom of the transmission pressure rod 472 is against the air pressure pad 43, and an elastic block is installed on the top of the transmission pressure rod 472, and the position of the elastic block is consistent with the transmission groove 1 Corresponding to 31, the transmission pressure rod 472 is against one side of the rubber gasket 13, and the transmission groove 131 can make the transmission pressure rod 472 reciprocately squeeze the surface of the air pressure pad 43, thereby causing the hollow tube 45 on one side to deform, and the lubricant stored in the hollow tube 45 can be transported to the annular cavity and guided to the outside of the transmission shaft 12 along the transmission groove 471. When the hollow tube 45 is reset, a small amount of lubricant can remain on the surface of the transmission shaft 12 for oiling and lubrication. While providing sufficient lubricant, it can also reduce the leakage of excess lubricant.

[0042] like Figure 8 As shown, a plurality of limiting holes are provided on the docking ring 44, and an adsorption shaft 46 is installed inside the limiting holes, an annular groove 461 is provided inside the adsorption shaft 46, a plurality of sponge sheets are provided inside the annular groove 461, and the sponge sheets are arranged in an annular array inside the annular groove 461, and a plurality of transmission holes are provided inside the annular groove 461;

[0043] A hollow tube 45 is installed on one side of the adsorption shaft 46. Lubricant is stored in the hollow tube 45 and is connected with the transmission hole. The bottom of the hollow tube 45 is stuck on the air pressure pad 43. The hollow tube 45 deforms with the air pressure pad 43 to change the internal air pressure, which is used to assist in lubricating the transmission shaft 12. During the circulating lubrication process, the sponge sheet inside the annular groove 461 can be used to adsorb dust and debris, thereby ensuring the smooth operation of the transmission shaft 12, extending the maintenance cycle of the motor, preventing debris from affecting the rotation process of the transmission shaft 12, and ensuring the stability of the equipment operation.

[0044] Working principle: First, during the operation of the motor, the auxiliary support mechanism 2 can be pressed against one side of the wind wheel for auxiliary support. At the same time, the dust-proof mechanism 3 prevents dust and the like from flowing along the airflow to the output end of the motor body 1, thereby reducing the abnormal noise of the bearing caused by dust accumulation and the like. At the same time, during the operation of the motor, the circulating lubrication mechanism 4 can be used to lubricate the connection between the motor drive shaft 12 and the motor body 1 to prevent the lack of oil and increased wear. When the wind wheel is supported, the position of the buffer rod 23 can be adjusted, and the limit pressure plate 24 can be pressed against one side of the wind wheel, which can play the role of auxiliary support and reduce the situation where the wind wheel has a small deviation during rotation, resulting in louder noise inside the air conditioner. As the reset shaft 25 is squeezed, the side walls can be pressed against each other by squeezing between the compression balls 251, which can not only play a buffering role, but also prevent dust and the like from entering the connection between the drive shaft 12 and the wind wheel, thereby extending the maintenance cycle of the equipment.

[0045] Then, during the operation of the motor, the transmission pressure rod 472 can be pressed against one side of the rubber gasket 13, and the transmission groove 131 can be used to make the transmission pressure rod 472 reciprocate and squeeze the surface of the air pressure pad 43, thereby causing the hollow tube 45 on one side to deform, and the lubricant stored in the hollow tube 45 can be transported to the annular cavity and guided to the outside of the transmission shaft 12 along the transmission groove 471. When the hollow tube 45 is reset, a small amount of lubricant can be left on the surface of the transmission shaft 12 for oiling and lubrication. In the process of circulating lubrication, the sponge sheet inside the annular groove 461 can be used to absorb dust and debris, so as to ensure the smooth operation of the transmission shaft 12 and extend the maintenance cycle of the motor.

[0046] Finally, during the operation of the motor, the blocking cover 31 can prevent dust from being diverted to one side of the motor body 1 and accumulate, and the sound-absorbing cotton can be used to block noise, thereby reducing the noise caused by the air conditioner during operation that affects people's normal rest, and providing a good user experience.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-noise variable-frequency speed-regulating air-conditioning motor, comprising a motor body (1), an auxiliary support mechanism (2) arranged on one side of an output end of the motor body (1), and a dust prevention mechanism (3) and a circulating lubrication mechanism (4) located between the auxiliary support mechanism (2) and the motor body (1), characterized in that: A plurality of mounting seats (11) are connected to the side wall of the motor body (1); a transmission shaft (12) is mounted on the output end of the motor body (1); a rubber gasket (13) is clamped on the motor body (1); the rubber gasket (13) is clamped on the bottom of the transmission shaft (12); the rubber gasket (13) is used to prevent lubricant from entering the interior of the motor body (1); and a plurality of transmission grooves (131) are formed on the surface of the rubber gasket (13); The auxiliary support mechanism (2) is mounted on one end of the transmission shaft (12) and is used to abut against the wind wheel for auxiliary positioning; the dustproof mechanism (3) and the circulating lubricating mechanism (4) are mounted on the transmission shaft (12); the dustproof mechanism (3) is mounted on the outside of the circulating lubricating mechanism (4); and the circulating lubricating mechanism (4) abuts against one side of the rubber gasket (13); The auxiliary support mechanism (2) comprises a positioning tube (21) and a clamping ring (22); a positioning groove is provided on the transmission shaft (12); the positioning tube (21) is sleeved on the transmission shaft (12) and has limit bolts inserted at both ends, and the limit bolts pass through the positioning groove; the clamping ring (22) is clamped on the top of the positioning tube (21); The clamping ring (22) is provided with a plurality of arc-shaped grooves, and a buffering rod (23) is inserted into the arc-shaped groove. A limiting pressure plate (24) is installed on the top of the buffering rod (23). The limiting pressure plate (24) can be pressed against one side of the wind wheel for auxiliary support. A reset shaft (25) is mounted on the top of the limiting pressure plate (24). The reset shaft (25) has a V-shaped cross section. A plurality of compression balls (251) are clamped inside the reset shaft (25). The reset shaft (25) can squeeze the compression balls (251) during the limiting process. The compression balls (251) squeeze each other, thereby reducing vibration during use, ensuring stable operation of the wind wheel, and reducing noise.

2. The low-noise variable-frequency speed-regulating air-conditioning motor according to claim 1 is characterized in that: The dustproof mechanism (3) comprises a blocking cover (31), the blocking cover (31) being clamped on the transmission shaft (12), and a rubber ring being installed on the side wall of the blocking cover (31).

3. The low-noise variable-frequency speed-regulating air-conditioning motor according to claim 2 is characterized in that: An annular groove is provided on the inner wall of the blocking cover (31), and sound-absorbing cotton is provided inside the annular groove, thereby reducing the noise emitted by the motor body (1) during operation.

4. The low-noise variable-frequency speed-regulating air-conditioning motor according to claim 1, characterized in that: The circulating lubrication mechanism (4) comprises a connecting ring (41), a docking ring (44) and a limiting tube (47); the connecting ring (41) is provided on the transmission shaft (12) and is located inside the dustproof mechanism (3); a circular groove is provided on a side of the connecting ring (41) close to the motor body (1), and a sealing ring (42) is clamped inside the circular groove; the docking ring (44) is clamped inside the connecting ring (41); the limiting tube (47) is clamped inside the docking ring (44); a gas pressure pad (43) is clamped on the top of the sealing ring (42); the bottom of the limiting tube (47) abuts against the gas pressure pad (43); and the inner diameter of the limiting tube (47) is larger than the inner diameter of the sealing ring (42).

5. The low-noise variable-frequency speed-regulating air-conditioning motor according to claim 4 is characterized in that: One side of the docking ring (44) is inclined, and an annular cavity is formed between the docking ring (44) and the rubber gasket (13). A plurality of transmission grooves (471) are formed at the bottom of the limiting tube (47), and the transmission grooves (471) are used to communicate with the annular cavity. A plurality of circular holes are formed inside the limiting tube (47), and a transmission pressure rod (472) is inserted into the circular hole. The bottom of the transmission pressure rod (472) is against the air pressure pad (43), and an elastic block is installed on the top of the transmission pressure rod (472), and the position of the elastic block corresponds to the transmission groove (131).

6. The low-noise variable-frequency speed-regulating air-conditioning motor according to claim 5, characterized in that: The docking ring (44) is provided with a plurality of limiting holes, and an adsorption shaft (46) is installed inside the limiting holes, an annular groove (461) is provided inside the adsorption shaft (46), a plurality of sponge sheets are provided inside the annular groove (461), and the sponge sheets are arranged in an annular array inside the annular groove (461), and a plurality of transmission holes are provided inside the annular groove (461); A hollow tube (45) is installed on one side of the adsorption shaft (46). Lubricant is stored in the hollow tube (45) and is connected to the transmission hole. The bottom of the hollow tube (45) is clamped on the air pressure pad (43). The hollow tube (45) deforms along with the air pressure pad (43), causing the internal air pressure to change, which is used to assist in lubricating the transmission shaft (12).

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