CN103032503B - Semi-active suspension energy feedback device of hybrid electric vehicle - Google Patents

Abstract

The invention relates to a semi-active suspension energy feeder for a hybrid vehicle, belonging to the technical field of vehicle energy saving and emission reduction. The invention integrates a barrel type linear generator into a traditional passive shock absorber, and sets a throttling port on the piston rod so that the damping force of the shock absorber can be adjusted. During the normal running of the vehicle, the piston rod as the mover moves relative to the stator, and the alternating current is induced in the armature winding, and the battery is charged through the energy feeding circuit, thereby recovering part of the vibration energy of the suspension system during the running of the vehicle; At the same time, according to the operating conditions of the vehicle, the size of the orifice aperture can be adjusted to change the damping force of the shock absorber, so as to improve the ride comfort, handling stability and safety of the vehicle.

Description

Hybrid vehicle semi-active suspension energy feeder

technical field

The invention relates to a hybrid vehicle semi-active suspension energy feeder, which belongs to the technical field of automobile energy saving and emission reduction. the

Background technique

In recent years, international oil prices have fluctuated, and energy and environmental issues have become increasingly prominent. Energy conservation, emission reduction, and low-carbon economy have become one of the main measures to achieve national sustainable development. Hybrid vehicles, while maintaining the characteristics of traditional vehicles, have the advantages of optimizing vehicle dynamic performance, effectively improving fuel economy, and greatly reducing exhaust emissions. At present, the "Energy Conservation and New Energy Vehicle Industry Development Plan (2011-2020)" led by the Ministry of Industry and Information Technology has been announced. , A relatively complete new energy vehicle industry system. In terms of hybrid electric vehicles, the overall goal by 2020 is that large-scale industrialization and popularization of hybrid electric vehicles will be achieved, mild hybrid systems with automatic start-stop functions will become standard configurations for passenger cars, and medium/severe hybrid systems will Passenger cars account for more than 50% of the annual production and sales of passenger cars, and the overall level of fuel economy of cars is in line with the international advanced level. With the implementation of various measures in the plan, it will provide unprecedented opportunities for the transformation and upgrading of traditional vehicles and the rapid development of hybrid vehicles and other new energy vehicles.

As we all know, my country has become the largest country in automobile production and sales. As of the end of August 2011, the number of motor vehicles in the country reached 219 million, of which the number of automobiles exceeded 100 million for the first time, accounting for 45.88% of the total number of motor vehicles. With the continuous increase of domestic car ownership, the pressure on energy saving and emission reduction of automobiles is huge, and energy saving and emission reduction has become the top priority of China's automobile development. Hybrid vehicles have proved their good effect in the field of energy saving and emission reduction, and are an important choice for the development of new energy vehicles. For hybrid vehicles, because the total power consumption is relatively low and the requirements for efficiency are very strict, a suspension system that can recover vibration energy is needed, which can directly use the energy recovered by the suspension, thereby reducing battery life. quality and reduce fuel consumption per 100 kilometers.

Contents of the invention

The technical problem to be solved by the present invention is to integrate the cylindrical permanent magnet linear generator into the traditional hybrid vehicle hydraulic shock absorber, connect it in series, and set two radial small holes on the piston rod of the hydraulic shock absorber. Hole, constructing a hybrid vehicle semi-active suspension energy feeder. During the operation of the vehicle, the damping force of the shock absorber is adjusted by controlling the opening of the hole to improve the ride comfort and handling stability of the vehicle. Part of the vibration energy is recovered from the relative movement between them, and stored in the form of electric energy, which improves the fuel economy of the vehicle and reduces energy consumption.

The technical solution adopted by the present invention to solve the technical problem is: to optimize the structure of the traditional passive hydraulic shock absorber, using the principle of relative linear motion between the piston rod and the shock absorber cylinder, A linear motor structure is integrated on the periphery of the liquid cylinder to recover part of the vibration energy of the suspension; and according to the principle of changing the damping force of the semi-active suspension by changing the aperture of the orifice, a small hole is opened on the piston rod of the traditional hydraulic shock absorber to achieve The purpose of changing the vibration damping force according to the working conditions during the running of the car. Through such a structural innovation, a new type of hybrid vehicle semi-active suspension energy feeder is obtained.

In the present invention, the structure of the traditional hydraulic shock absorber is improved, and the piston rod is replaced by a piston rod mover, a valve body and a hollow screw that are sequentially threaded.

The invention includes: an energy feeding mechanism, a throttle adjusting mechanism, a damping force control mechanism, a main body of a hydraulic shock absorber and an outer cover;

The energy feeding mechanism is a barrel-type permanent magnet linear generator, which is composed of a relative moving piston rod mover and a stator. The piston rod mover is changed from the traditional hydraulic shock absorber piston rod structure. The stator is located on the outer peripheral side of the liquid storage cylinder. A circle of the mover; the piston rod mover is a hydraulic shock absorber piston rod, the hydraulic shock absorber piston rod is a hollow structure, the end of the piston rod mover protruding from the stator is provided with a flange plate structure, and the The flange plate structure is non-magnetic material. The flange plate structure of the piston rod mover has four light holes axially along the circumferential direction. The flange plate structure of the piston rod mover is fixed to the damping force control mechanism. The other part of the piston rod mover is made of permanent magnet material, the other end of the piston rod mover is threaded, and the valve body of the throttle adjustment mechanism is connected through threads, and the stator is connected with the reservoir of the hydraulic shock absorber. The liquid cylinders are welded together and located on the outer peripheral side of the liquid storage cylinder, including three-phase pie-shaped armature windings and stator cores arranged in sequence along the axial direction of the liquid storage cylinder.

The main body of the hydraulic shock absorber includes a sealing assembly, a liquid storage cylinder, a working cylinder, a piston assembly and a bottom valve assembly. A working cylinder with a coaxial center line is arranged in the liquid storage cylinder, and the working cylinder is divided into an upper chamber by the piston assembly. and the lower chamber, the sealing assembly seals the liquid storage cylinder and the upper end of the working cylinder, and the piston rod mover passes through the center of the sealing assembly; the bottom valve assembly is arranged at the bottom of the working cylinder and is sealed and connected.

The orifice adjusting mechanism includes a valve body, a valve core, a rubber seal, and a hollow screw rod. The valve body is a hollow structure, and two small holes are drilled symmetrically along the radial direction. The inner holes at both ends of the valve body are threaded, and the diameter of the threaded holes at both ends is larger than the inner diameter of the valve body. One end of the threaded hole is connected to the thinner end of the piston rod mover. Fixed connection, the other end is connected with the hollow screw rod. The valve core is located inside the valve body. There is a threaded hole on the upper surface of the valve core, which is used for fixed screw connection with the connecting rod. There is a groove for fixing the sealing ring along the circumference near the upper end surface, and the rubber seal forms a seal with the valve body. To prevent oil from overflowing, the spool can slide axially relative to the valve body under the action of the damping force adjustment mechanism to control the size of the orifice aperture. The bottom of the spool rests on the The end of the hollow screw. In addition, the hollow screw has a hollow structure, the outer circle is in the shape of a stepped shaft, and there is a tool relief groove at the place where the shaft diameter changes. The outer circumference of both ends of the hollow screw is tapped with threads, and the end of the larger shaft diameter is threaded with the valve body. The end of the smaller shaft diameter is connected with a hollow screw nut, which is used to fix the recovery valve spring. The inner hole of the hollow screw and the two radial holes on the circumference of the valve body form the liquid flow of the upper and lower chambers of the hydraulic shock absorber. circuit.

The damping force control mechanism includes a circular suction cup electromagnet, a limit spring, a connecting rod and a fixed plate. Among them, the circular sucker electromagnet can change the size of the suction force according to the size of the incoming current, thereby changing the size of the electromagnetic force that attracts the connecting rod, and controls the valve port between the valve core and the valve body by driving the connecting rod to move up and down. Relative to the opening, that is, the size of the orifice aperture, there is a threaded hole on the top of the suction cup electromagnet, which can be fixed on the outer cover by a T-shaped screw to prevent its radial relative movement. The limit spring is installed between the connecting rod and the circular sucker electromagnet, and has a pre-compression amount to prevent the impact of the up and down jump of the connecting rod on the opening of the valve port during the operation of the vehicle. In addition, one end of the connecting rod has a structure similar to a flange, and there is a groove on the end surface of the flange to fix the limit spring. This part is made of magnetically conductive material, which can be It moves in the axial direction, so as to drive the axial movement of the valve core relative to the valve body, and the rest is made of non-magnetic material to prevent the axial force of the piston rod mover and stator on the connecting rod; the other part of the connecting rod There is a protruding screw structure on the end surface of one end, and the connecting rod passes through the piston rod mover and is threadedly connected with the valve core. The fixed plate is an annular cylindrical structure, which is used to axially fix the circular suction cup electromagnet so that it does not move relative to the up and down directions. The fixed plate has four threaded holes in the radial direction for fixing with the outer cover. There are also four threaded holes evenly distributed in the axial direction, and the axes thereof are staggered by 90 degrees from the adjacent radially arranged threaded holes, which are used for fixed connection with the piston rod.

The main body of the hydraulic shock absorber includes a seal assembly, a liquid storage cylinder, a working cylinder, a piston assembly and a bottom valve assembly, etc., except for the piston rod. The shock absorber working cylinder is divided into an upper chamber by the piston assembly. and the lower cavity.

Description of drawings

Fig. 1 is a structural diagram of an embodiment of the invention.

In the figure: 10-energy feeding mechanism 101-piston rod mover 102-stator 1021-stator core 1022-three-phase pie-type armature winding 20-throttle port adjustment mechanism 201-valve body 202-spool 203-rubber seal 204-Hollow screw 2041-Hollow screw nut 30-Damping force control mechanism 301-Circular suction cup electromagnet 302-Limiting spring 303-Connecting rod 304-Fixed block 40-Hydraulic shock absorber main body 401-Seal assembly 402-Reservoir Liquid cylinder 403-working cylinder 404-piston assembly 4041-recovery valve spring 405-bottom valve assembly 406-upper chamber 407-lower chamber 50-outer cover 501-T-shaped screw

Detailed ways

The present invention will be further described below in conjunction with drawings and embodiments.

The new semi-active suspension energy feeder integrates the barrel permanent magnet linear generator into the traditional hybrid vehicle hydraulic shock absorber, and opens two small radial holes on the piston rod of the hydraulic shock absorber. Obtained, including: an energy feeding mechanism 10 , an orifice adjusting mechanism 20 , a damping force control mechanism 30 , a hydraulic shock absorber main body 40 and an outer cover 50 .

The energy feeding mechanism 10 is a cylindrical permanent magnet linear generator, which is composed of a piston rod mover 101 and a stator 102 that can move relatively. The stator 102 is welded together with the liquid storage cylinder 402 of the hydraulic shock absorber, located on the outer peripheral side of the liquid storage cylinder 402 , and includes three-phase pie-shaped armature windings 1022 and stator cores 1021 arranged in sequence along the axial direction of the liquid storage cylinder 402 . The piston rod mover 101 is changed from the traditional hydraulic shock absorber piston rod structure and is designed as a hollow structure. One end of the piston rod mover 101 is shaped like a flange and is a non-magnetic material. There are four axial openings along the circumferential direction. A light hole, to be connected with the fixed plate 304 of the damping force control mechanism 30, the rest of the piston rod mover 101 is made of permanent magnetic material, and the other end of the piston rod mover 101 is tapped with threads, so as to be connected with the orifice adjustment mechanism. The valve body 201 of 20 is connected by thread.

The throttle adjusting mechanism 20 includes a valve body 201 , a valve core 202 , a rubber seal 203 and a hollow screw 204 . The valve body 201 is a hollow structure, and two small holes are drilled symmetrically along the radial direction. The inner holes at both ends of the valve body 201 are threaded, and the diameter of the threaded holes at both ends is larger than the inner diameter of the valve body 201. One end of the threaded hole is connected to the piston rod mover 101 The thinner end is fixedly connected, and the other end is connected with the hollow screw rod 204 . The valve core 202 is located inside the valve body 201. There is a threaded hole on the upper surface of the valve core 202, which is used for fixed screw connection with the connecting rod 303. There is a groove for fixing the sealing ring along the circumference near the upper surface, and the rubber seal 203 is connected with the valve. Body 201 constitutes a seal to prevent oil from overflowing. The spool 202 can slide axially relative to the valve body 201 under the action of the damping force adjustment mechanism 30 to control the size of the orifice aperture. Iron 301 leans against the end of hollow screw rod 204 when there is no electromagnetic force effect. At this time, the small hole of the orifice is blocked, and the opening is zero. The hollow screw 204 has a hollow structure, the outer circle is in the shape of a stepped shaft, and there is an undercut at the place where the shaft diameter changes. The outer circumference of both ends of the hollow screw 204 is tapped with threads, and the end with a larger shaft diameter is screwed to the valve body 201. The hollow screw nut 2041 is connected to the end of the smaller shaft diameter, which is used to fix the recovery valve spring 4041. The inner hole of the hollow screw 204 and the two radial holes on the circumference of the valve body 201 form the upper chamber 406 of the hydraulic shock absorber. Liquid flow circuit with the lower chamber 407 .

The damping force control mechanism 30 includes a circular suction cup electromagnet 301 , a limit spring 302 , a connecting rod 303 and a fixing plate 304 . The circular suction cup electromagnet 301 can change the size of the suction force according to the size of the incoming current, thereby changing the size of the electromagnetic force that attracts the connecting rod 303, and controls the gap between the valve core 202 and the valve body 201 by driving the connecting rod 303 to move up and down. The relative opening of the valve port is the size of the orifice aperture. There is a threaded hole at the top of the circular suction cup electromagnet 301, which can be fixed on the outer cover 50 by a T-shaped screw 501 to prevent its radial relative movement. The limit spring 302 is installed between the connecting rod 303 and the circular suction cup electromagnet 301, and has a pre-compression amount to prevent the impact of the up and down jump of the connecting rod 303 on the opening of the valve port during the running of the vehicle. One end of the connecting rod 303 is a structure similar to a flange, and there is a groove on the end face of the flange to fix the limit spring 302. This part is made of magnetically conductive material. It can move in the axial direction under the action of the valve core 202 relative to the valve body 201, and the rest is made of non-magnetic material to prevent the piston rod mover 101 and the stator 102 from producing axial movement on the connecting rod 303. There is a protruding screw structure on the end surface of the other end of the connecting rod 303, and the connecting rod 303 passes through the piston rod mover 101 and is threadedly connected with the valve core 202. The fixed plate 304 is an annular cylindrical structure, which is used to axially fix the circular sucker electromagnet 301 so that it does not move relative to each other in the up and down direction. The fixed plate 304 has four threaded holes in the radial direction for fixing with the outer cover 50. There are also four threaded holes evenly distributed in the axial direction on the lower end surface, and the axes thereof are staggered by 90 degrees from the adjacent radially arranged threaded holes, which are used for fixed connection with the flange structure of the piston rod mover 101 .

The main body 40 of the hydraulic shock absorber includes a sealing assembly 401, a liquid storage cylinder 402, a working cylinder 403, a piston assembly 404, and a bottom valve assembly 405, which are traditional hydraulic shock absorbers except the piston rod, and the shock absorber working cylinder 403 It is divided into two parts by the piston assembly 404, an upper cavity 406 and a lower cavity 407.

The outer cover 50 is cylindrical box-shaped, and a part protrudes from the upper end, the inner diameter of the protruding part is equal to the outer diameter of the circular suction cup electromagnet 301, and the top of the protruding part has a small hole for fixing the circular suction cup electromagnet with T-shaped screws 501. The lower end of the iron 301 and the outer cover 50 is drilled with four through holes radially along the circumference for connecting with the fixing plate 304 .

The specific implementation process of the present invention will be further described below in conjunction with the accompanying drawings.

The relative motion between the sprung mass (body) and the unsprung mass (wheel) is caused by the excitation of uneven road surface and complex road conditions, thus causing the piston rod mover 101 and the stator 102 of the semi-active suspension energy feeder to move. Since the piston rod mover 101 is a magnetically permeable material, an alternating current is generated in the three-phase pie-shaped armature winding 1022 of the stator 102, and the generated current is stored in the form of electric energy to the hybrid vehicle through proper processing In the on-board power supply or supercapacitor, it is used for starting or accelerating the car.

Due to the interaction between the electric current generated when the linear generator generates electricity and the magnetic field of the piston rod mover 101 , electromagnetic resistance will be generated. In this way, the damping force of the semi-active suspension energy feeder is greater than that of the traditional hydraulic cylinder shock absorber, so a valve body 201 with a small radial hole is connected to the piston rod mover 101, and the damping force control mechanism The movement of the valve core 202 is driven to change the relative position of the valve core 202 and the valve body 201, and change the opening of the radial small hole, thereby changing the area of the liquid flow channel to achieve the effect of changing the damping force. During the operation of the car, the ECU of the suspension system collects the signals of the sprung mass acceleration sensor and the unsprung mass acceleration sensor, and performs calculations to judge the electromagnetic resistance that the cylindrical linear generator can generate. Then the ECU sends a control signal to the controller according to the vehicle body control requirements and an appropriate control algorithm, thereby changing the magnitude of the current input to the circular suction cup electromagnet 301 to change the magnitude of the force attracting the connecting rod 303 . Since the upper end of the connecting rod 303 is made of magnetically conductive material, under the action of the suction force of the circular sucker electromagnet 301, the connecting rod 303 overcomes the elastic force of the limit spring 302 and moves upward along the axis, thereby driving the valve core 202 threadedly connected therewith to move upward. Movement, so that the valve core 202 is in different positions, and the relative position change between the valve core 202 and the valve body 201 causes the change of the radial orifice throttling area. According to the size of the damping force required by the operating conditions of the automobile, the operating current of the circular suction cup electromagnet 301 can be changed, so that the throttling area of the radial holes can be changed according to the requirements of the operating conditions. In this way, the oil flow path between the upper cavity 406 and the lower cavity 407 of the semi-active suspension energy feeder includes not only the small hole on the piston assembly 404, but also the radial small hole on the valve body 201 and the hollow screw rod 204. The oil passage composed of holes can change the damping force and improve the stability, comfort and safety of the car.

When the semi-active suspension energy feeder breaks down and the vibration energy of the suspension cannot be recovered, the input current of the circular suction cup electromagnet 301 is cut off, and the connecting rod 303 is screwed to it under the elastic force of the limit spring 302. The spool 202 is pressed against the end of the hollow screw 204, and the valve body 201 and the spool 202 are closed, that is, the throttle area of the small radial hole on the valve body 201 is zero. At this time, the oil circulation path of the upper cavity 406 and the lower cavity 407 of the semi-active suspension energy feeder is only the small hole on the piston assembly 404, and the semi-active suspension energy feeder is in the form of a traditional cylinder hydraulic shock absorber. Work.

Through the function of the semi-active suspension energy feeder, part of the vibration energy of the suspension is recovered and stored in the form of electric energy in the power supply of the hybrid vehicle for secondary utilization of the hybrid vehicle. At the same time, since the damping force of the semi-active suspension can be adjusted according to changes in road conditions, the ride comfort, stability and safety of the vehicle are greatly improved.

Claims (3)

1. An energy feeder for a semi-active suspension of a hybrid vehicle, comprising an energy feed mechanism (10), an orifice adjustment mechanism (20), a damping force control mechanism (30) and a hydraulic shock absorber main body (40); The hydraulic shock absorber main body (40) includes a sealing assembly (401), a liquid storage cylinder (402), a working cylinder (403), a piston assembly (404) and a bottom valve assembly (405), and a liquid storage cylinder (402 ) is provided with a coaxial working cylinder (403), the working cylinder (403) is divided into upper chamber (406) and lower chamber (407) by the piston assembly (404), and the sealing assembly (401) will store The liquid cylinder (402) is sealed with the upper end of the working cylinder (403), and the piston rod mover (101) passes through the center of the sealing assembly (401); the bottom valve assembly (405) is set at the bottom of the working cylinder (403) And sealed connection; It is characterized in that: it also includes an outer cover (50); The energy feeding mechanism (10) is a cylindrical permanent magnet linear generator; the cylindrical permanent magnet linear generator is composed of a relative moving piston rod mover (101) and a stator (102); the stator (102 ) is welded together with the liquid storage cylinder (402) of the hydraulic shock absorber, the stator (102) is located on the outer peripheral side of the liquid storage cylinder (402), and the three-phase pie-type armature winding (1022) and the stator core (1021) Along the axial direction of the liquid storage cylinder (402), they are arranged one week around the piston rod mover (101); the piston rod mover (101) is a hydraulic shock absorber piston rod, and the hydraulic shock absorber piston rod is a hollow structure. The end of the rod mover (101) protruding from the stator (102) is provided with a flange-shaped structure, the flange-shaped structure of the piston rod mover (101) is made of non-magnetic material, and the flange of the piston rod mover (101) The disc-shaped structure has four light holes axially along the circumferential direction. The flange disc-shaped structure of the piston rod mover (101) is connected with the fixed plate (304) of the damping force control mechanism (30). The piston rod mover (101) ) other parts are made of permanent magnet material, the other end of the piston rod mover (101) is threaded, and is connected with the valve body (201) of the orifice adjusting mechanism (20) through threads; The orifice adjusting mechanism (20) includes a valve body (201), a valve core (202), a rubber seal (203) and a hollow screw (204); the valve body (201) is a hollow cylinder structure, and Two small holes are drilled symmetrically along the radial direction; the inner walls of both ends of the valve body (201) are threaded, the diameter of the threaded holes is larger than the inner diameter of the valve body (201), and one end of the valve body (201) is connected to one end of the piston rod mover (101). Threaded connection, the valve body (201) is threaded with the hollow screw rod (204); the valve core (202) is located inside the valve body (201), and the upper end surface of the valve core (202) has a threaded hole, which is connected with the connecting rod (303) The lower end is fixedly threaded, the spool (202) has a groove for fixing the sealing ring along the circumference near the upper end surface, and forms a seal with the valve body (201) through the rubber seal (203) to prevent oil from overflowing, the spool (202 ) slides up and down relative to the valve body (201) in the axial direction under the action of the damping force control mechanism (30), to control the relative opening of the valve port between the valve core (202) and the valve body (201), and the valve core ( 202) The bottom is against the upper end of the hollow screw (204) when the suction cup electromagnet (301) has no electromagnetic force. At this time, the relative opening of the valve port between the valve core (202) and the valve body (201) is zero; the hollow screw (204) is a hollow structure, the outer circle is in the shape of a stepped shaft, and there is an undercut at the place where the shaft diameter changes, and the outer circumference of both ends of the hollow screw (204) is threaded, and the end with a larger shaft diameter The end is threadedly connected with the valve body (201), and the end of the small shaft diameter is connected with a hollow screw nut (2041), and the hollow screw nut (2041) fixes the recovery valve spring (4041), and the inner hole of the hollow screw (204) is connected with the Two small radial holes on the circumference of the valve body (201) form the liquid flow circuit of the upper cavity (406) and the lower cavity (407) of the hydraulic shock absorber; The damping force control mechanism (30) includes a circular suction cup electromagnet (301), a limit spring (302), a connecting rod (303) and a fixed plate (304); the connecting rod (303) is arranged on the piston rod mover (101), the circular sucker electromagnet (301) changes the size of the electromagnetic force attracting the connecting rod (303) according to the size of the incoming current, and controls the spool (202) by driving the connecting rod (303) to move up and down. ) and the valve body (201), there is a threaded hole on the top of the circular suction cup electromagnet (301), and the circular suction cup electromagnet (301) is fixed to the outer cover ( 50); the limit spring (302) is installed between the upper end of the connecting rod (303) and the circular suction cup electromagnet (301), and has a pre-compression amount; The outer cover (50) is cylindrical with a closed upper end, and the upper end is a stepped protrusion, the inner diameter of the raised part is equal to the outer diameter of the circular sucker electromagnet (301), and a small hole is opened at the top of the raised part, T The shape screw (501) fixes the circular sucker electromagnet (301) through the small hole, and the lower end of the outer cover (50) is drilled with four through holes radially along the circumference, and the outer cover (50) is connected with the fixed plate (304) through the four through holes. connect. 2. The hybrid vehicle semi-active suspension energy feeder according to claim 1, characterized in that one end of the connecting rod (303) is a flange-shaped structure, and the flange-shaped structure of the connecting rod (303) There is a groove on the end surface of the structure, and the limit spring (302) is fixed in the groove. The flange-shaped structure of the connecting rod (303) is made of magnetically conductive material. The bottom moves axially, driving the valve core (202) to move axially relative to the valve body (201), and the other parts of the connecting rod (303) are made of non-magnetic materials to prevent the piston rod mover (101) from and the stator (102) produces an axial force on the connecting rod (303). 3. The hybrid vehicle semi-active suspension energy feeder according to claim 2, characterized in that, the fixing plate (304) is an annular cylindrical structure, which axially fixes the circular suction cup electromagnet (301), so that The circular sucker electromagnet (301) does not move relative to the up and down direction, the fixed plate (304) has four threaded holes along the radial direction, the fixed plate (304) and the outer cover (50) are fixed by bolts, the fixed plate (304) There are four threaded holes evenly distributed in the axial direction on the end face, and the axes of the four threaded holes are staggered by 90 degrees from the adjacent radially arranged threaded holes. The flange disc structure is fixedly connected.