Pendulum impact test device for wheel assembly

Abstract

The invention belongs to the field of automobile wheel impact tests, and particularly relates to a pendulum bob impact test device for a wheel assembly, which is characterized in that four pendulum bob supporting beams are symmetrically arranged on the rigid ground, and pendulum bob suspension brackets are arranged at the tops of the pendulum bob supporting beams; the pendulum bob suspension support is connected with the cage type pendulum bob through a suspension steel cable, the cage type pendulum bob is connected with the wheel assembly support, and the wheel assembly is arranged on the wheel assembly support. A lifting motor is arranged on the rigid ground and connected with an electromagnet through a cable, and the electromagnet is connected with a triangular support on a pendulum bob suspension support through a suspension steel cable. A pendulum bob friction slope is arranged at the bottom of the cage type pendulum bob, and the ground lifting friction mechanism is connected with the rigid ground and arranged under the pendulum bob friction slope. According to the invention, the measured wheel can be rapidly mounted and dismounted without being interfered by human factors, the precision is high, the equipment structure is simple and reliable, and the cost is low.

Description

Technical Field

[0001] This invention belongs to the field of automotive wheel impact testing, specifically relating to a pendulum impact testing device for a wheel assembly. Background Technology

[0002] With the rapid development of the automotive industry, wheels, as a key load-bearing component of vehicles, have received increasing attention for their safety performance and reliability. During actual driving, wheels not only need to withstand continuous loads from the road surface but may also encounter sudden impact loads, such as collisions with curbs, potholes, or foreign objects. Therefore, conducting impact performance tests on wheels to simulate their stress response under extreme conditions has become an important means of ensuring their structural strength and service life.

[0003] Currently, the commonly used wheel impact testing methods in the industry mainly include falling weight impact testing and pendulum impact testing. Among them, pendulum impact testing has gradually become a mainstream testing method due to its advantages such as controllable energy, adjustable impact direction, and good test repeatability. However, existing pendulum impact testing equipment still has some problems in practical applications: 1. Limited range of impact energy adjustment: Traditional pendulum devices usually use pendulums of fixed length or fixed mass, which makes it difficult to achieve precise adjustment of impact energy over a wide range, thus limiting their adaptability to different types of wheels (such as passenger car wheels, commercial vehicle wheels, aluminum alloy wheels, steel wheels, etc.).

[0004] 2. Lack of effective mechanisms to prevent secondary impact: During the pendulum impact process, some energy is not effectively absorbed or released, resulting in the pendulum rebound and causing a secondary impact. There is a lack of effective means to prevent secondary impact during the test, which leads to inaccurate test results due to secondary impact.

[0005] Therefore, there is an urgent need for a wheel pendulum impact testing equipment with a reasonable structure, adjustable energy, precise control, and safety and reliability, in order to solve the problems existing in the current technology and improve the scientific nature, accuracy and versatility of wheel impact testing. Summary of the Invention

[0006] This invention proposes a pendulum impact testing device for wheel assemblies to solve the problem of low accuracy in existing wheel impact testing methods.

[0007] To achieve the above objectives, the present invention proposes the following technical solution: A pendulum impact testing device for a wheel assembly includes a rigid ground, a pendulum suspension bracket, four pendulum support beams, a suspension cable, a cage-type pendulum, a wheel assembly bracket, an electromagnet, a pendulum friction ramp, a ground lifting and friction mechanism, a collision barrier, and a lifting motor. The four pendulum support beams are symmetrically arranged on a rigid ground, and the pendulum suspension bracket is located on top of the pendulum support beams; the pendulum suspension bracket is connected to the cage pendulum via suspension cables, and the cage pendulum is connected to the wheel assembly bracket; the lifting motor is located on the rigid ground, and the lifting motor is connected to the electromagnet via suspension cables, and the electromagnet is connected to the pendulum suspension bracket via suspension cables; the bottom of the cage pendulum is provided with a pendulum friction ramp; The ground lifting friction mechanism is connected to the rigid ground and is located directly below the pendulum friction slope; The collision barrier is a hollow cuboid structure, fixed to a rigid ground surface.

[0008] Preferably, the pendulum friction ramp includes a fixed base plate, a first rigid ramp, and a first wear-resistant steel plate; The first wear-resistant steel plate is installed on the first rigid inclined surface, the first rigid inclined surface is installed on the fixed base plate, and the fixed base is fixed to the bottom of the cage-type pendulum.

[0009] Preferably, the ground lifting friction mechanism includes a second wear-resistant steel plate, a second rigid inclined plane, a cylinder, and a cylinder seat; The second wear-resistant steel plate is installed on the second rigid inclined surface, the bottom of the second rigid inclined surface is in contact with the front end of the cylinder, the cylinder is fixed on the cylinder seat, and the cylinder seat is fixed on the rigid ground.

[0010] Preferably, when the cylinder is in the retracted state, the second rigid inclined surface is placed in the cylinder seat, and when the cylinder is in the extended state, the second rigid inclined surface will not extend beyond the upper edge of the cylinder seat.

[0011] Preferably, the inclination angle α of the first rigid inclined surface in the pendulum friction inclined surface is 3°-5°, the inclination angle β of the second rigid inclined surface in the ground lifting friction mechanism is 3°–5°, and the contact area between the first rigid inclined surface and the second rigid inclined surface is ≥80%.

[0012] Preferably, the first wear-resistant steel plate and the second wear-resistant steel plate are made of the same material, and the coefficient of friction between the first wear-resistant steel plate and the second wear-resistant steel plate is between 0.4 and 0.6.

[0013] Preferably, an impact force sensor and a time delay switch are installed on the contact surface between the collision barrier and the wheel under test, and the contact surface of the time delay switch protrudes beyond the contact surface of the impact force sensor.

[0014] Preferably, the pendulum suspension bracket includes a suspension crossbar and a frame. The frame is square and has two suspension crossbars inside. Each suspension crossbar is equipped with two guide rail roller bearings. The frame is connected to the pendulum support beam, and the frame is connected to the suspension cable via a triangular bracket.

[0015] Preferably, the frame is a square structure welded from H-beams.

[0016] Preferably, a first base is installed on the top of the pendulum support beam, the first base is connected to the pendulum suspension bracket, and a second base is installed on the bottom of the pendulum support beam, the second base is connected to the rigid ground.

[0017] Preferably, the cage-type pendulum includes a triangular support, twelve fixed clamps, six pendulum H-beams, counterweights, and two upright plates, and the whole structure is a cage-type structure. Two upright plates are located on the front and rear sides. Six pendulum H-shaped steel bars are connected to the two upright plates through twelve fixing clamps. The counterweight is fixed on the pendulum H-shaped steel bars, and the triangular bracket is fixed on the top of the cage-type pendulum.

[0018] Preferably, the wheel assembly bracket has a triangular structure, with its bottom connected to the upright plate of the cage-type pendulum and its top connected to the wheel assembly.

[0019] Preferably, the lifting motor includes a motor, a reducer, a drum, and a cable, and the motor is fixedly installed on a rigid ground. The motor is connected to a reducer and drives the drum to rotate. One end of the cable is fixed to the drum, and the other end is connected to an electromagnet.

[0020] The advantages of this invention are: This invention proposes a test device for wheel pendulum impact. When an electromagnet is energized, it can attract a cage-type pendulum. A lifting motor retracts a steel cable to pull the pendulum to a certain height. Then, a reverse current is applied to the electromagnet to release the pendulum, allowing it to swing freely and complete the impact. During the descent of the pendulum, a ground-lifting friction mechanism is used. When the tire collides with a collision barrier, a delay switch is activated. This delay switch controls the ground-lifting friction mechanism to raise a friction ramp, which then contacts the pendulum's friction ramp. When the pendulum falls again, the friction between the two ramps stops its movement, thus preventing a second impact. This invention allows for rapid installation and removal of the wheel being measured, is unaffected by human error, has high accuracy, a simple and reliable structure, and low cost. Attached Figure Description

[0021] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 An overall view of a test device for wheel pendulum impact; Figure 2 This is a structural diagram of the pendulum suspension bracket; Figure 3 This is a structural diagram of a cage-type pendulum. Figure 4 An exploded view of the ground lifting friction mechanism; Figure 5 This is a cross-sectional view of the pendulum friction ramp contacting the ground lifting friction mechanism. Figure 6 The front view and cross-sectional view are of the collision barrier; Figure 7 An isometric drawing of the entire equipment; Figure 8 This is a flowchart of the experimental procedure. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0023] The following detailed description is exemplary and intended to provide further detailed explanation of the invention. Unless otherwise specified, all technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this invention is for describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. Example

[0024] Please see Figure 1 As shown, the present invention provides a test device for wheel pendulum impact, comprising: a rigid ground 1, a pendulum suspension bracket 2, a pendulum support beam 3, a suspension cable 4, a cage pendulum 5, a wheel assembly 6, a wheel assembly bracket 7, an electromagnet 8, a pendulum friction inclined plane 9, a ground lifting friction mechanism 10, a collision barrier 11, and a lifting motor 12.

[0025] like Figure 2 As shown, the pendulum suspension bracket 2 includes a suspension crossbar 201 and a frame 203. The frame 203 is square and welded from H-beams. It has two suspension crossbars 201 inside, and each suspension crossbar 201 is equipped with two guide rail roller bearings 202. A triangular bracket 501 is provided on the frame 203.

[0026] The pendulum support beam 3 has four beams that converge upwards in a conical shape and are fixed to the rigid ground 1. A first base 301 is installed on the top of the pendulum support beam 3, and the first base 301 is connected to the frame 203 of the pendulum suspension bracket 2. A second base 302 is installed at the bottom of the pendulum support beam 3, and the second base 302 is connected to the rigid ground 1.

[0027] like Figure 3As shown, the cage-type pendulum 5 includes a triangular support 501, a fixing clamp 502, a pendulum H-beam 503, a counterweight 504, and a vertical plate 505, forming an overall cage structure. Two vertical plates 505 are located on the front and rear sides. Six pendulum H-beams 503 are connected to the two vertical plates 505 via twelve fixing clamps 502, together forming the cage-type pendulum. The counterweight 504 is fixed to the pendulum H-beams 503 for adjusting the weight of the pendulum. The triangular support 501 is fixed to the top of the cage-type pendulum 5.

[0028] The suspension cable 4 adopts an adjustable length segmented structure. One end of the suspension cable 4 is fixed to the guide rail roller bearing 202 in the pendulum suspension bracket 2 through the triangular bracket 501, and the other end is fixed to the triangular bracket 501 at the top of the cage pendulum 5. By adjusting the length of the four suspension cables 4, the entire cage pendulum 5 is suspended in the air.

[0029] The wheel assembly 6 is the wheel and tire assembly to be tested, and the tire is filled with gas at a certain pressure.

[0030] The wheel assembly bracket 7 is a triangular structure welded from steel. The bottom of the wheel assembly bracket 7 is connected to the upright plate 505 of the cage-type pendulum 5, and the top is connected to the wheel. The wheel assembly 6 is mounted on the wheel assembly bracket 7 without interference. The wheel assembly bracket 7 has high structural strength and can withstand impacts without deformation or damage.

[0031] The electromagnet 8 is equipped with a triangular bracket 501 that is the same as the top of the cage pendulum 5. It is connected to the triangular bracket 501 on the frame 203 of the pendulum suspension bracket 2 by a suspension steel cable 4. The length of the suspension steel cable 4 suspending the electromagnet 8 is the same as the length of the suspension steel cable 4 suspending the cage pendulum 5. When the cage pendulum 5 is pulled to swing, the two suspension steel cables 4 move in a parallelogram shape.

[0032] like Figure 4 As shown, the pendulum friction ramp 9 includes a fixed base plate 901, a first rigid ramp 902, and a first wear-resistant steel plate 903. The first wear-resistant steel plate 903 is mounted on the first rigid ramp 902, which is mounted on the fixed base plate 901. The fixed base plate 901 is fixed to the H-beam 503 at the bottom of the cage-type pendulum 5. The first rigid ramp 902 is installed facing forward.

[0033] like Figure 5As shown, the ground lifting friction mechanism 10 includes a second wear-resistant steel plate 1001, a second rigid inclined surface 1002, a cylinder 1003, and a cylinder seat 1004. The second wear-resistant steel plate 1001 is mounted on the second rigid inclined surface 1002. The bottom of the second rigid inclined surface 1002 contacts the front end of the piston of the cylinder 1003. When the cylinder piston extends, it lifts the second rigid inclined surface 1002 together with the second wear-resistant steel plate 1001. The cylinder 1003 is fixed on the cylinder seat 1004. When the cylinder 1003 is in the retracted state, the second rigid inclined surface 1002 can be placed in the cylinder seat 1004. When the cylinder 1003 is in the extended state, the second rigid inclined surface 1002 will not exceed the upper edge of the cylinder seat 1004. The cylinder seat 1004 is fixed on the rigid ground 1.

[0034] like Figure 6 As shown, the collision barrier 11 is made of rigid material and is fixedly installed on a rigid ground 1. Its main body is a rectangular hollow structure with a certain thickness and weight, ensuring that the wheel assembly 6 will not deform or shift after impact. An impact force sensor 1101 and a time delay switch 1102 are installed on the contact surface between the collision barrier 11 and the wheel assembly 6. The contact surface of the time delay switch 1102 protrudes beyond the contact surface of the impact force sensor 1101. When the cage pendulum 5 is released, the tire first contacts the time delay switch 1102, and then contacts the impact force sensor 1101.

[0035] The lifting motor 12 consists of a motor, a reducer, a drum, and a cable. The motor is fixedly installed on a rigid ground 1. The motor is connected to the reducer and drives the drum to rotate. One end of the cable is fixed to the drum, and the other end is connected to an electromagnet 8. By controlling the forward and reverse rotation of the motor, the contraction and extension of the steel cable are adjusted, thereby driving the cage pendulum 5 to rise or fall.

[0036] In one specific embodiment, the rigid ground 1 is a cast iron plate or steel plate with a certain thickness, and has a square recess in the middle for fixing the ground lifting friction mechanism 10. The specific size depends on the size of the ground lifting friction mechanism 10.

[0037] In one specific embodiment, the pendulum support beam 3 is made entirely of the same H-beams as the pendulum suspension bracket 2.

[0038] In one specific embodiment, the two sections of the suspension cable 4 are connected by an adjustable-length turnbuckle, with an adjustable range of 0-100mm.

[0039] In one specific embodiment, each triangular bracket 501 is equipped with a guide rail roller bearing.

[0040] In one specific embodiment, the inclination angle α of the first rigid inclined surface 902 in the pendulum friction inclined surface 9 is 3°-5°, and the inclination angle β of the second rigid inclined surface B1002 in the ground lifting friction mechanism 10 is 3°–5°, and α and β are matching angles, so that the contact area of ​​the two inclined surfaces is ≥80%.

[0041] In one specific embodiment, the first wear-resistant steel plate 903 and the second wear-resistant steel plate 1001 are made of the same material, and the coefficient of friction between the two steel plates is between 0.4 and 0.6.

[0042] In one specific embodiment, the delay time of the delay switch 1102 of the collision barrier 11 can be manually adjusted according to the falling height of the pendulum.

[0043] In one specific embodiment, the lateral spacing of the guide rail roller bearings 202 on the suspension crossbar 201 in the pendulum suspension bracket 2 is greater than the lateral spacing of the triangular bracket 501 at the top of the cage pendulum 5, and the longitudinal axis of the suspension crossbar 201 is equal to the longitudinal axis of the triangular bracket 501. Example

[0044] The process of the test device for wheel pendulum impact described in this invention is as follows: Figure 7 , Figure 8 As shown, specifically: This invention provides a pendulum impact testing device for a wheel assembly, comprising a rigid ground 1, a pendulum suspension bracket 2, a pendulum support beam 3, a suspension cable 4, a cage-type pendulum 5, a wheel assembly 6, a wheel assembly bracket 7, an electromagnet 8, a pendulum friction ramp 9, a ground lifting and friction mechanism 10, a collision barrier 11, and a lifting motor 12, etc. The rigid ground 1 is a common cast iron platform. The pendulum suspension bracket 2 has a square frame structure with two suspension crossbars 201 inserted in the middle. Each suspension crossbar 201 has guide rail roller bearings 202 installed at both ends. The cage-type pendulum 5 has a cage structure with four triangular supports 501 installed at the four corners of its top. A guide rail roller bearing 202 is installed in a triangular bracket 501. The guide rail roller bearing is fixed to the triangular bracket 501 by a pin. The cage-type pendulum 5 and the pendulum suspension bracket 2 are connected by four suspension steel cables 4. The suspension steel cables 4 are two-sectioned and connected in the middle by a turnbuckle tensioner, allowing the length of the suspension steel cables 4 to be freely adjusted within a certain range. One end of the suspension steel cable 4 is fixed to the guide rail roller bearing 202 in the pendulum suspension bracket 2, and the other end is fixed to the guide rail roller bearing 202 at the top of the cage-type pendulum 5. The pendulum suspension bracket 2 is connected to the first base at the upper end of the pendulum support beam 3 by bolts. The bottom of the pendulum support beam 3 is connected to the second base by bolts, and the second base is connected to the rigid ground by bolts. The four pendulum support beams 3 converge upwards in a conical shape. By adjusting the length of the four suspension cables 4, the cage pendulum 5 is lifted off the rigid ground 1 and reaches a certain height. A wheel assembly bracket 7 is installed on the front of the cage pendulum 5, and the wheel assembly 6 to be tested is installed on the wheel assembly bracket 7. A collision barrier 11 is installed on the rigid ground 1 on one side of the wheel assembly 6, and the collision barrier 11 is connected to the rigid ground 1 by bolts. A flat iron plate is installed on the back of the cage pendulum 5. The top and sides of the electromagnet 8 are... A triangular bracket 501 is installed, and each triangular bracket 501 is equipped with a guide rail roller bearing 202. The guide rail roller bearing 202 on the top of the electromagnet 8 is connected to the suspension bracket 2 through the suspension steel cable 4. The guide rail roller bearing 202 on the side of the electromagnet 8 is connected to the steel cable of the lifting motor 12 behind the cage pendulum 5. When the electromagnet 8 is energized, it can be attracted to the iron plate on the back of the cage pendulum 5. During the test, the electromagnet 8 is energized, which firmly attracts the cage pendulum 5. The cage pendulum 5 is pulled to a certain height by the retraction of the steel cable by the lifting motor 12. Then, a reverse current is applied to the electromagnet 8 to release the cage pendulum 5, so that it swings freely and completes the impact.

[0045] A pendulum 5 has a pendulum friction ramp 9 installed at its bottom. A ground lifting friction mechanism 10 is installed on the rigid ground 1 directly below the pendulum friction ramp 9. The ground lifting friction mechanism 10 has two states: a descending state and an ascending state. When the pendulum 5 is stationary, the ground lifting friction mechanism 10 is in the descending state. At this time, the pendulum 5 can pass smoothly through the ground lifting friction mechanism 10 when it falls. When the tire collides with the collision barrier 11, a delay switch is activated. The delay switch controls the ground lifting friction mechanism 10 to switch to the ramp state and make contact with the pendulum friction ramp 9. When the pendulum 5 falls again, the friction between the two ramps stops the pendulum 5, thereby preventing the pendulum 5 from having a second impact.

[0046] As is known from common technical knowledge, this invention can be implemented through other embodiments that do not depart from its spirit or essential characteristics. Therefore, the disclosed embodiments described above are merely illustrative in all respects and are not the only ones. All modifications within the scope of this invention or its equivalents are included in this invention.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A pendulum impact testing device for a vehicle wheel assembly, characterised in that, The rigid ground, the pendulum suspension bracket, four pendulum support beams, a suspension cable, a cage pendulum, a wheel assembly bracket, an electromagnet, a pendulum friction slope, a ground lifting friction mechanism, a collision barrier and a lifting motor are included. The four pendulum support beams are symmetrically arranged on the rigid ground, and the pendulum suspension bracket is arranged on the top of the pendulum support beam; the pendulum suspension bracket is connected with the cage pendulum through the suspension cable, and the cage pendulum is connected with the wheel assembly bracket; the lifting motor is arranged on the rigid ground, and the lifting motor is connected with the electromagnet through the suspension cable, and the electromagnet is connected with the pendulum suspension bracket through the suspension cable; the bottom of the cage pendulum is provided with the pendulum friction slope. The ground lifting friction mechanism is connected with the rigid ground and located directly below the pendulum friction slope. The collision barrier is a hollow cuboid structure and is fixed on the rigid ground.

2. A pendulum impact testing device for a vehicle wheel assembly as defined in claim 1, wherein, The pendulum friction slope includes a fixed bottom plate, a first rigid slope and a first wear-resistant steel plate. The first wear-resistant steel plate is mounted on the first rigid slope, the first rigid slope is mounted on the fixed bottom plate, and the fixed bottom is fixed on the bottom of the cage pendulum.

3. A wheel assembly pendulum impact testing device as claimed in claim 2, wherein, The ground lifting friction mechanism includes a second wear-resistant steel plate, a second rigid slope, a cylinder and a cylinder seat. The second wear-resistant steel plate is mounted on the second rigid slope, the bottom of the second rigid slope is in contact with the front end of the cylinder, the cylinder is fixed on the cylinder seat, and the cylinder seat is fixed on the rigid ground.

4. A swing hammer impact testing device for a wheel assembly as defined in claim 3 wherein, When the cylinder is in the retracted state, the second rigid slope is placed in the cylinder seat, and when the cylinder is in the extended state, the second rigid slope does not exceed the upper edge of the cylinder seat.

5. A swing hammer impact testing device for a wheel assembly as defined in claim 3 wherein, The inclination angle α of the first rigid slope in the pendulum friction slope is 3°-5°, the inclination angle β of the second rigid slope in the ground lifting friction mechanism is 3°-5°, and the contact area of the first rigid slope and the second rigid slope is ≥80%.

6. A swing hammer impact testing device for a wheel assembly as defined in claim 3 wherein, The first wear-resistant steel plate and the second wear-resistant steel plate are made of the same material, and the friction coefficient between the first wear-resistant steel plate and the second wear-resistant steel plate is between 0.4 and 0.

6.

7. A swing hammer impact testing device for a wheel assembly as defined in claim 1 wherein, The contact surface of the collision barrier and the to-be-tested wheel is provided with an impact force sensor and a delay switch, and the contact surface of the delay switch protrudes from the contact surface of the impact force sensor.

8. A swing hammer impact testing device for a wheel assembly as defined in claim 1 wherein, The pendulum suspension bracket includes a suspension crossbar and a frame, the frame is square, two suspension crossbars are arranged inside, and two guide rail roller bearings are arranged on each suspension crossbar. The frame is connected with the pendulum support beam, and the frame is connected with the suspension cable through a triangular support.

9. A wheel assembly pendulum impact testing device as claimed in claim 8, wherein, The frame is a square structure welded by H-shaped steel.

10. A swing hammer impact testing device for a wheel assembly as defined in claim 1 wherein, The top of the pendulum support beam is provided with a first base, the first base is connected with the pendulum suspension bracket, the bottom of the pendulum support beam is provided with a second base, and the second base is connected with the rigid ground.

11. A swing hammer impact testing device for a wheel assembly as defined in claim 1 wherein, The cage pendulum includes a triangular support, twelve fixed clamps, six pendulum H-shaped steels, a counterweight and two vertical plates, and the whole is a cage structure. The two vertical plates are located on the front and rear sides, the six pendulum H-shaped steels are connected with the two vertical plates through the twelve fixed clamps, the counterweight is fixed on the pendulum H-shaped steel, and the triangular support is fixed on the top of the cage pendulum.

12. A pendulum impact testing device for a wheel assembly as defined in claim 11, wherein, The wheel assembly support is of a triangular structure, the bottom of the wheel assembly support is connected with the vertical plate of the cage pendulum, and the top is connected with the wheel assembly.

13. A swing hammer impact testing device for a wheel assembly as defined in claim 1 wherein, The lifting motor comprises a motor, a speed reducer, a roller and a cable, and the motor is fixedly installed on the rigid ground. The motor is connected with the speed reducer and drives the roller to rotate, one end of the cable is fixed on the roller, and the other end is connected with the electromagnet.

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