A limited push rod motor

Abstract

The invention discloses a limit-type push rod motor, comprising: a motor housing, a connection port is installed on the surface of the motor housing, a cable lead-out line is installed on the connection port, a sleeve seat, a connecting sleeve is installed inside the motor housing, a worm is rotatably provided inside the connecting sleeve, the sleeve seat is installed on one side of the connecting sleeve, a lead screw is rotatably provided inside the sleeve seat, and the lead screw is meshed with the worm, an extrusion transmission mechanism, the extrusion transmission mechanism is arranged on the surface of the transmission shaft, an auxiliary maintenance mechanism, the auxiliary maintenance mechanism is arranged on one side of the sleeve seat, and a movable cleaning mechanism, the movable cleaning mechanism is rotatably arranged on one side of the auxiliary maintenance mechanism. Compared with the prior art, the invention can rotate the movable cleaning mechanism as a whole, so that the positioning plate can swing along with the counterweight ball under the action of inertia, and the cleaning ring can rotate locally, so that oil and dirt can be quickly squeezed into the inside of the annular groove, so that they are accumulated inside the elastic hook, thereby playing an auxiliary collection role.

Description

Technical Field

[0001] The invention relates to the technical field of motors, in particular to a position-limiting push rod motor. Background Art

[0002] Electric linear actuator, also known as linear drive, is a new type of linear actuator mainly composed of motor push rod and control device. It can be considered as an extension of the structure of rotary motor. Electric linear actuator is an electric drive device that converts the rotational motion of the motor into the linear reciprocating motion of the push rod. It can be used as an executive machine in various simple or complex process flows to achieve remote control, centralized control or automatic control. It is mostly used in motion drive units in household appliances, kitchen utensils, medical equipment, automobiles and other industries.

[0003] Due to the influence of working environment and other conditions, the existing push rod motors may accelerate the aging and leakage of oil in high temperature and humid working environment, and also promote the adhesion and diffusion of oil on the surface of the transmission rod. Especially under high temperature, high pressure or high load working conditions, it is easy to cause poor lubrication on the surface of the transmission rod, resulting in increased friction resistance in the transmission process, which in turn affects the operating efficiency and power output of the push rod motor, and affects the transmission accuracy and positioning accuracy. For push rod motors that require high-precision control, this may lead to a decline in product quality. For this reason, we propose a limited push rod motor to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide a position-limiting push rod motor to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a limit type push rod motor, comprising:

[0006] A motor housing, a connection port is installed on the surface of the motor housing, and a cable lead is installed on the connection port;

[0007] A sleeve seat, a connecting sleeve is installed inside the motor housing, a worm is rotatably provided inside the connecting sleeve, the sleeve seat is installed on one side of the connecting sleeve, a screw is rotatably provided inside the sleeve seat, and the screw is meshed with the worm, a transmission shaft is movably inserted on one side of the sleeve seat, the transmission shaft is hollow and has a rotating plate inside, and the screw is installed on one side of the rotating plate;

[0008] An extrusion transmission mechanism, which is arranged on the surface of the transmission shaft and is used to prevent oil and dirt from spreading on the transmission shaft;

[0009] An auxiliary maintenance mechanism, the auxiliary maintenance mechanism is arranged on one side of the sleeve seat, the auxiliary maintenance mechanism is arranged concentrically with the transmission shaft, and the auxiliary maintenance mechanism is used to lubricate and maintain the surface of the transmission shaft;

[0010] A movable cleaning mechanism is rotatably arranged on one side of the auxiliary maintenance mechanism. The movable cleaning mechanism can clean the dirt accumulated on the surface of the transmission shaft. When the push rod motor is needed, the extrusion transmission mechanism can play a blocking role to reduce the situation where oil and dirt on the connection end side spread to the surface of the transmission shaft. As the extrusion transmission mechanism can be against one side of the movable cleaning mechanism, when the motor starts to run, the movable cleaning mechanism can assist in cleaning the surface of the transmission shaft under the driving action of the auxiliary maintenance mechanism. The auxiliary maintenance mechanism can apply an appropriate amount of lubricating grease on the transmission shaft according to maintenance requirements to reduce friction and wear and extend the service life of the equipment.

[0011] Preferably, a push rod is installed at one end of the transmission shaft, an internal thread groove is formed on the push rod, a pair of arc grooves are formed on the transmission shaft, and an arc insert plate is clamped inside the arc groove.

[0012] Preferably, the extrusion transmission mechanism includes a transmission ring and a plurality of compression shafts, the transmission ring is movably sleeved on the surface of the transmission shaft, the compression shafts are arranged in a uniform array on both sides of the transmission ring, one end of the compression shaft is clamped on an arc-shaped plug plate, the compression shaft is elastic and has a sponge plate clamped inside.

[0013] Preferably, a plurality of magnetic plates are installed on the side of the transmission ring close to the sleeve seat, a plurality of arc grooves are opened inside the transmission ring, and adsorption blocks are provided inside the arc grooves. A plurality of compression rings are installed inside the transmission ring, and the inner wall of the compression ring is arranged in contact with the surface of the transmission shaft.

[0014] Preferably, the auxiliary maintenance mechanism comprises a sealing ring and a pair of clamping rings, a plurality of reset plates are fixedly connected between the clamping rings, the reset plates are arranged between the clamping rings in a uniform array, one side of the clamping ring is clamped at one end of the sleeve seat, and the sealing ring is clamped at the outside of the clamping ring;

[0015] A plurality of grooves are provided on the surface of the sealing ring, and an arc clamping plate is installed inside the groove. The arc clamping plate is arranged on the sealing ring in a uniform array. A plurality of limiting shafts are fixedly connected to the inside of the arc clamping plate. The limiting shaft is elastic and "U"-shaped. An adsorption shaft is clamped between the limiting shaft and the inner wall of the arc clamping plate, and the position of the adsorption shaft corresponds to the interval of the reset plate.

[0016] Preferably, a plurality of squeezing balls are fixedly connected to the inner wall of the clamping ring, the squeezing balls on the clamping rings on both sides are staggered, the positions of the squeezing balls correspond to the reset plates, an arc pressure plate is fixedly connected between the squeezing balls, the arc pressure plate is elastic and is staggered with the adsorption axis at the interval of the reset plate, a plurality of expansion balls are fixedly connected to the surface of the clamping ring on one side, the positions of the expansion balls correspond to the squeezing balls on the clamping ring on one side.

[0017] Preferably, the movable cleaning mechanism includes a rotating ring and a plurality of inclined gaskets, the rotating ring being rotatably set on a clamping ring on one side, an annular groove being provided inside the rotating ring, and the inner wall of the annular groove being in contact with the surface of the expansion ball, the inclined gasket being clamped on the rotating ring, the top of the inclined gasket being arc-shaped, a cleaning ring being clamped between the inclined gaskets, the cleaning ring being in contact with the surface of the transmission shaft, a plurality of annular grooves being provided on the surface of the cleaning ring, and a plurality of elastic barbs being provided inside the annular groove for cleaning dirt and impurities.

[0018] Preferably, a plurality of positioning plates are installed on the surface of the cleaning ring, and the positioning plates are staggered with the inclined gaskets. The swing of the positioning plates can drive the cleaning ring to partially twist and rotate. The cross-section of the positioning plates is elliptical, and a counterweight ball is fixedly connected to one end of the positioning plates.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention rotates the movable cleaning mechanism as a whole, and can make the positioning plate swing along with the weight ball under the action of inertia, so that the cleaning ring partially rotates, and can quickly squeeze the oil and dirt into the annular groove, so that it accumulates inside the elastic hook, playing a role of auxiliary collection;

[0021] 2. The present invention can play a blocking role under the action of the transmission ring during the transmission process, preventing oil and dirt on one side of the connection end from being transmitted to the transmission shaft, and reducing the spread of oil and dirt on the surface of the transmission shaft;

[0022] 3. In the process of reciprocating motion of the transmission shaft, the cleaning ring of the present invention can clean and accumulate dirt on the surface of the transmission shaft, thereby reducing wear during the transmission process;

[0023] 4. The present invention can deform the limit shaft when the clamping ring is squeezed and rotates slightly, thereby squeezing the adsorption shaft to apply grease to the surface of the transmission shaft for maintenance, reducing the stagnation and jamming caused by long-term use, and ensuring the processing accuracy of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the structure of the extrusion transmission mechanism of the present invention;

[0026] Figure 3 It is a schematic diagram of the local structure of the transmission shaft of the present invention;

[0027] Figure 4 For the present invention Figure 3 A partial enlarged schematic diagram in the middle;

[0028] Figure 5 This is a schematic diagram of the structure of the clamping ring of the present invention;

[0029] Figure 6 This is a schematic diagram of the internal structure of the auxiliary maintenance mechanism of the present invention;

[0030] Figure 7 For the present invention Figure 6 A partial enlarged schematic diagram of point B in the middle;

[0031] In the figure: 1. motor housing; 2. sleeve seat; 3. extrusion transmission mechanism; 4. auxiliary maintenance mechanism; 5. movable cleaning mechanism; 11. connection port; 12. cable lead; 13. connecting sleeve; 21. transmission shaft; 22. push rod; 23. arc plug plate; 31. transmission ring; 32. compression shaft; 33. magnetic plate; 34. compression ring; 41. sealing ring; 42. snap ring; 43. arc clamping plate; 44. limit shaft; 441. adsorption shaft; 45. expansion ball; 46. reset plate; 47. extrusion ball; 471. arc pressure plate; 51. rotating ring; 52. tilting gasket; 53. cleaning ring; 54. positioning plate; 55. counterweight ball. 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 1-7 The present invention provides a technical solution: a limit type push rod motor, comprising:

[0034] A motor housing 1, a connection port 11 is installed on the surface of the motor housing 1, and a cable lead 12 is installed on the connection port 11, which can be connected to an external device;

[0035] A sleeve seat 2, a connecting sleeve 13 is installed inside the motor housing 1; a worm is rotatably provided inside the connecting sleeve 13, the sleeve seat 2 is installed on one side of the connecting sleeve 13, a screw is rotatably provided inside the sleeve seat 2, and the screw is meshed with the worm, a transmission shaft 21 is movably inserted on one side of the sleeve seat 2, the transmission shaft 21 is hollow and has a rotating plate inside, and the screw is installed on one side of the rotating plate, a push rod 22 is installed at one end of the transmission shaft 21, an internal thread groove is provided on the push rod 22, a pair of arc grooves are provided on the transmission shaft 21, and an arc insert plate 23 is clamped inside the arc groove, and the arc insert plate 23 can be disassembled and cleaned;

[0036] The extrusion transmission mechanism 3 is arranged on the surface of the transmission shaft 21. The extrusion transmission mechanism 3 is used to prevent oil and dirt from spreading on the transmission shaft 21. In order to reduce the residual oil and dirt, the extrusion transmission mechanism 3 includes a transmission ring 31 and a plurality of compression shafts 32. The transmission ring 31 is movably sleeved on the surface of the transmission shaft 21. The compression shafts 32 are arranged on both sides of the transmission ring 31 in a uniform array. One end of the compression shaft 32 is clamped on the arc plug plate 23. The compression shaft 32 is elastic and has a sponge plate clamped inside. Under the action of the magnetic plate 33, it can be in contact with the counterweight ball 55. As the transmission shaft 22 moves, it can be under the action of the magnet. Pulling the transmission ring 31 to rotate slightly can enable the sponge plate inside the compression plate 32 to quickly clean the surface of the transmission shaft 22. In order to reduce the spread of oil stains, a plurality of magnetic plates 33 are installed on the side of the transmission ring 31 close to the sleeve seat 2. A plurality of arc grooves are opened inside the transmission ring 31, and adsorption blocks are arranged inside the arc grooves. A plurality of compression rings 34 are installed inside the transmission ring 31. The inner wall of the compression ring 34 is in contact with the surface of the transmission shaft 21. Under the action of the transmission ring 31, it plays a blocking role to prevent oil stains on one side of the connection end from being transmitted to the transmission shaft 21, which plays a protective role and reduces corrosion and wear on the surface of the transmission shaft 22.

[0037] The auxiliary maintenance mechanism 4 is arranged on one side of the sleeve seat 2. The auxiliary maintenance mechanism 4 is concentrically arranged with the transmission shaft 21. The auxiliary maintenance mechanism 4 is used to lubricate and maintain the surface of the transmission shaft 21. In order to maintain the transmission shaft 22, the auxiliary maintenance mechanism 4 includes a sealing ring 41 and a pair of clamping rings 42. A plurality of reset plates 46 are fixedly connected between the clamping rings 42. The reset plates 46 are arranged between the clamping rings 42 in a uniform array. One side of the clamping ring 42 is clamped at one end of the sleeve seat 2. The sealing ring 41 The clamp is arranged on the outside of the clamping ring 42, and a plurality of clamping grooves are opened on the surface of the sealing ring 41, and a circular arc clamping plate 43 is installed inside the clamping groove. The circular arc clamping plate 43 is arranged on the sealing ring 41 in a uniform array, and a plurality of limiting shafts 44 are fixedly connected inside the circular arc clamping plate 43. The limiting shaft 44 is elastic and "U"-shaped. An adsorption shaft 441 is clamped between the limiting shaft 44 and the inner wall of the circular arc clamping plate 43. The position of the adsorption shaft 441 corresponds to the interval of the reset plate 46. When the clamping ring 42 is squeezed and rotated slightly, it can make The limit shaft 44 is deformed, thereby squeezing the adsorption shaft 441 to apply grease to the surface of the transmission shaft 21 for maintenance, reducing the stagnation and jamming caused by long-term use, ensuring the processing quality of the equipment, and reducing the occurrence of defective products. A plurality of squeezing balls 47 are fixedly connected to the inner wall of the clamping ring 42. The squeezing balls 47 on the clamping rings 42 on both sides are staggered. The positions of the squeezing balls 47 correspond to the reset plates 46. An arc-shaped pressing plate 471 is fixedly connected between the squeezing balls 47. The arc-shaped pressing plate 471 has an elastic The arc-shaped pressing plate 471 is arranged at the interval of the reset plate 46 in an interlaced manner with the adsorption shaft 441. A plurality of expansion balls 45 are fixedly connected to the surface of the clamping ring 42 on one side. The position of the expansion balls 45 corresponds to the squeezing balls 47 on the clamping ring 42 on one side. When the arc-shaped pressing plate 471 is squeezed, the pushing squeezing balls 47 can be deformed, so that the expansion balls 45 on one side are deformed and pressed against the inside of the annular groove, which can play a positioning role for the movable cleaning mechanism 5, can make it rotate under the subsequent inertia, and can play a driving role for the movable cleaning squeezing 5;

[0038] The movable cleaning mechanism 5 is rotatably arranged on one side of the auxiliary maintenance mechanism 4. The movable cleaning mechanism 5 can clean the dirt accumulated on the surface of the transmission shaft 21. In order to reduce the accumulation of dirt during the cleaning process, the movable cleaning mechanism 5 includes a rotating ring 51 and a plurality of inclined gaskets 52. The rotating ring 51 is rotatably arranged on a clamping ring 42 on one side. An annular groove is provided inside the rotating ring 51, and the inner wall of the annular groove is in contact with the surface of the expansion ball 45. The inclined gasket 52 is clamped on the rotating ring 51, and the top of the inclined gasket 52 is arc-shaped. A cleaning ring 53 is clamped between the inclined gaskets 52. The cleaning ring 53 is arranged in contact with the surface of the transmission shaft 21. A plurality of annular grooves are provided on the surface of the cleaning ring 53, and a plurality of elastic barbs are provided inside the annular grooves for cleaning dirt and impurities. In order to avoid the accumulation of dirt residues due to long-term cleaning, a plurality of positioning plates 54 are installed on the surface of the cleaning ring 53. The positioning plates 54 are staggered with the inclined gaskets 52. The swing of the positioning plates 54 can drive the local twisting and rotation of the cleaning ring 53. The cross-section of the positioning plates 54 is elliptical, and one end of the positioning plates 54 is fixed A counterweight ball 55 is fixedly connected, and the cleaning mechanism 5 rotates as a whole. Under the action of inertia, the positioning plate 54 can swing along with the counterweight ball 55, so that the cleaning ring 53 rotates partially, and the excess oil is collected, thereby extending the maintenance period of the equipment. As the cleaning ring 53 rotates partially, the oil and the like can be quickly squeezed into the annular groove, so that it accumulates inside the elastic hook, which plays a role of auxiliary collection. As the transmission shaft 21 reciprocates, the cleaning ring 53 can clean and accumulate dirt and the like on the surface of the transmission shaft 21, thereby reducing the wear during the transmission process. When the push rod motor is needed, the extrusion transmission mechanism 3 can play a blocking role, thereby reducing the spread of oil and the like on one side of the connection end to the surface of the transmission shaft 21. When the motor starts to run, the movable cleaning mechanism 5 can assist in cleaning the surface of the transmission shaft 21 under the driving action of the auxiliary maintenance mechanism 4, and the auxiliary maintenance mechanism 4 can apply an appropriate amount of lubricating grease on the transmission shaft 21 according to the maintenance requirements, thereby playing a maintenance role and reducing the loss during use.

[0039] Working principle: First, when the push rod motor needs to be used, the extrusion transmission mechanism 3 can play a blocking role to reduce the oil on the connection end side from spreading to the surface of the transmission shaft 21, and as the extrusion transmission mechanism 3 can be against the side of the movable cleaning mechanism 5, when the motor starts to run, the movable cleaning mechanism 5 can assist in cleaning the surface of the transmission shaft 21 under the driving action of the auxiliary maintenance mechanism 4, and the auxiliary maintenance mechanism 4 can apply an appropriate amount of lubricating grease on the transmission shaft 21 according to maintenance requirements to reduce friction and wear and extend the service life of the equipment, and during the transmission process, it can play a blocking role under the action of the transmission ring 31 to prevent the oil on the connection end side from being transmitted to the transmission shaft 21, and reduce the spread of the oil on the surface of the transmission shaft 21;

[0040] Then, during the transmission process, the bottom of the transmission ring 31 can be abutted against one side of the movable cleaning mechanism 5, and the clamping ring 42 can be compressed under the action of the arc pressure plate 471. When the transmission shaft 21 is pushed outward, the transmission ring 31 can be away from the movable cleaning mechanism 5, and the arc pressure plate 471 can push the clamping ring 42 to reset, so that the movable cleaning mechanism 5 can rotate as a whole, and the positioning plate 54 can swing along with the counterweight ball 55 under the action of inertia, so that the cleaning ring 53 can rotate partially, and the oil and dirt can be quickly squeezed into the annular groove, so that it accumulates inside the elastic hook, which plays a role of auxiliary collection. In addition, as the transmission shaft 21 reciprocates, the cleaning ring 53 can clean and accumulate dirt on the surface of the transmission shaft 21, thereby reducing wear during the transmission process.

[0041] Finally, when the clamping ring 42 is squeezed and rotates slightly, the limit shaft 44 can be deformed, thereby squeezing the adsorption shaft 441 to apply grease to the surface of the transmission shaft 21 for maintenance, reducing the stagnation and jamming caused by long-term use, and ensuring the processing accuracy of the equipment.

[0042] 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 limited push rod motor, characterized in that: include, A motor housing (1), a connection port (11) being mounted on a surface of the motor housing (1), and a cable lead (12) being mounted on the connection port (11); A sleeve seat (2), wherein a connecting sleeve (13) is installed inside the motor housing (1), wherein a worm is rotatably provided inside the connecting sleeve (13), the sleeve seat (2) is installed on one side of the connecting sleeve (13), a screw is rotatably provided inside the sleeve seat (2), and the screw is meshed with the worm, a transmission shaft (21) is movably inserted into one side of the sleeve seat (2), the transmission shaft (21) is hollow and has a rotating plate inside, and the screw is installed on one side of the rotating plate; An extrusion transmission mechanism (3), the extrusion transmission mechanism (3) being arranged on the surface of the transmission shaft (21), the extrusion transmission mechanism (3) being used to prevent oil stains from spreading on the transmission shaft (21); The extrusion transmission mechanism (3) comprises a transmission ring (31) and a plurality of compression shafts (32); the transmission ring (31) is movably sleeved on the surface of the transmission shaft (21); the compression shafts (32) are arranged in a uniform array on both sides of the transmission ring (31); one end of the compression shaft (32) is clamped on the arc-shaped plug plate (23); the compression shaft (32) is elastic and has a sponge plate clamped inside; an auxiliary maintenance mechanism (4), the auxiliary maintenance mechanism (4) being arranged on one side of the sleeve seat (2), the auxiliary maintenance mechanism (4) being arranged concentrically with the transmission shaft (21), and the auxiliary maintenance mechanism (4) being used to lubricate and maintain the surface of the transmission shaft (21); A movable cleaning mechanism (5), the movable cleaning mechanism (5) being rotatably disposed on one side of the auxiliary maintenance mechanism (4), and the movable cleaning mechanism (5) being capable of cleaning dirt accumulated on the surface of the transmission shaft (21); The movable cleaning mechanism (5) comprises a rotating ring (51) and a plurality of inclined gaskets (52). The rotating ring (51) is rotatably arranged on a clamping ring (42) at one side. An annular groove is provided inside the rotating ring (51), and the inner wall of the annular groove is arranged in contact with the surface of the expansion ball (45). The inclined gaskets (52) are clamped on the rotating ring (51). The top of the inclined gaskets (52) is arc-shaped. A cleaning ring (53) is clamped between the inclined gaskets (52). The cleaning ring (53) is arranged in contact with the surface of the transmission shaft (21). The surface of the cleaning ring (53) is provided with a plurality of annular grooves, and the inside of the annular grooves is provided with a plurality of elastic barbs for cleaning dirt and impurities.

2. The position-limiting push rod motor according to claim 1, characterized in that: A push rod (22) is mounted on one end of the transmission shaft (21), an internal thread groove is formed on the push rod (22), a pair of arc grooves are formed on the transmission shaft (21), and an arc insert plate (23) is clamped inside the arc grooves.

3. The position-limiting push rod motor according to claim 1, characterized in that: A plurality of magnetic plates (33) are installed on a side of the transmission ring (31) close to the sleeve seat (2); a plurality of arc grooves are provided inside the transmission ring (31); adsorption blocks are provided inside the arc grooves; a plurality of compression rings (34) are installed inside the transmission ring (31); inner walls of the compression rings (34) are arranged in contact with the surface of the transmission shaft (21).

4. The position-limiting push rod motor according to claim 1, characterized in that: The auxiliary maintenance mechanism (4) comprises a sealing ring (41) and a pair of clamping rings (42), a plurality of reset plates (46) being fixedly connected between the clamping rings (42), the reset plates (46) being arranged between the clamping rings (42) in a uniform array, one side of the clamping ring (42) being clamped on one end of the sleeve seat (2), and the sealing ring (41) being clamped on the outside of the clamping ring (42); A plurality of slots are provided on the surface of the sealing ring (41), and arc clamping plates (43) are installed inside the slots. The arc clamping plates (43) are arranged on the sealing ring (41) in a uniform array. A plurality of limiting shafts (44) are fixedly connected inside the arc clamping plates (43). The limiting shafts (44) are elastic and in a "U" shape. An adsorption shaft (441) is clamped between the limiting shaft (44) and the inner wall of the arc clamping plate (43). The position of the adsorption shaft (441) corresponds to the interval of the reset plate (46).

5. The position-limiting push rod motor according to claim 4, characterized in that: A plurality of squeezing balls (47) are fixedly connected to the inner wall of the clamping ring (42), the squeezing balls (47) on the clamping rings (42) on both sides are arranged in a staggered manner, the positions of the squeezing balls (47) correspond to the reset plates (46), an arc-shaped pressing plate (471) is fixedly connected between the squeezing balls (47), the arc-shaped pressing plate (471) is elastic and is staggered with the adsorption shaft (441) at the interval of the reset plates (46), and a plurality of expansion balls (45) are fixedly connected to the surface of the clamping ring (42) on one side, the positions of the expansion balls (45) correspond to the squeezing balls (47) on the clamping ring (42) on one side.

6. The position-limiting push rod motor according to claim 1 is characterized in that: A plurality of positioning plates (54) are mounted on the surface of the cleaning ring (53); the positioning plates (54) and the inclined gaskets (52) are arranged in a staggered manner; the swing of the positioning plates (54) can drive the cleaning ring (53) to partially twist and rotate; the cross section of the positioning plates (54) is elliptical; and a counterweight ball (55) is fixedly connected to one end of the positioning plates (54).

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