Locomotive iron shoe self-retracting mechanism

Abstract

The application discloses a locomotive iron shoe self-retracting mechanism, which comprises an iron shoe, a connecting rod, an extension drive, a first elastic element and a second elastic element, the high end of the connecting rod is hinged to a bogie, the low end of the connecting rod is hinged to one end of the iron shoe, the high end of the extension drive is hinged to the bogie, the low end of the extension drive is hinged to the connecting rod, and the extension drive is used for driving the connecting rod to rotate, so that the low end of the connecting rod is close to or away from a wheel set and a track. The iron shoe can be tightly abutted against the wheel set and the track under the action of the first elastic element and the second elastic element when the iron shoe is in a braking state, the iron shoe can keep a parking state even if the bidirectional cylinder leaks, the no-energy-consumption long-time anti-slip function is realized, the first elastic element pulls up the iron shoe when the iron shoe is in a retracting state, the second elastic element pushes up the connecting rod, and the iron shoe can keep the retracting state even if the bidirectional cylinder leaks.

Description

Technical Field

[0001] This invention relates to the field of rail transit braking technology, and in particular to a locomotive brake shoe self-retracting mechanism. Background Technology

[0002] With the rapid development of rail transportation, the number of rail locomotives and vehicles is increasing, and their use and dispatching are becoming more frequent. When a locomotive stops, wheel chocks are placed on the rails under the wheels to prevent the locomotive from rolling away. When the locomotive starts moving, the wheel chocks are removed. There are two main methods for removing and placing wheel chocks: manual and electric. Using the manual method increases the labor intensity of workers, and forgetting to place the wheel chocks can cause a rollover accident. Existing electrically driven parking brake retraction mechanisms (such as the locomotive anti-slip device with application number 201822145792.8) achieve self-retraction and extension of the parking brake through the extension and retraction of a cylinder and the transmission action of a transmission mechanism. When the parking brake is extended, the cylinder is in a forward airflow and pressure-holding state, which puts the parking brake in a braking state. When the parking brake is retracted, the cylinder is in a reverse airflow and pressure-holding state, which puts the parking brake in a retracted state. If the cylinder leaks air when the parking brake is in a braking state, it will reduce the braking effect of the parking brake and may even cause the locomotive to lose its parking state. If the cylinder leaks air when the parking brake is in a retracted state, it will cause the parking brake to extend, affecting the normal operation of the locomotive. Summary of the Invention

[0003] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a locomotive brake shoe self-retracting mechanism. This solves the technical problems in the prior art where, if the brake shoe is in the braking state, air leakage in the cylinder will reduce the braking effect of the brake shoe and may even cause the locomotive to be unable to maintain the parking state; and if the brake shoe is in the retracting state, air leakage in the cylinder will cause the brake shoe to be released, affecting the normal operation of the locomotive.

[0004] To achieve the above-mentioned technical objectives, the present invention provides a locomotive track shoe self-retrieval mechanism, disposed directly above the rail and behind the wheelset, for retrieving and retrieving track shoes, comprising:

[0005] Iron shoes;

[0006] The connecting rod has its high end hinged to the bogie and its low end hinged to one end of the wheel shoe;

[0007] A telescopic drive component, with its high end hinged to the bogie and its low end hinged to the connecting rod, is used to drive the connecting rod to rotate, so that the low end of the connecting rod approaches or moves away from the wheelset and the track, and the other end of the wheel shoe abuts into or moves out of the angle α formed by the wheelset and the track;

[0008] The first elastic element has its high end hinged to the connecting rod and its low end hinged to the iron shoe, and is used to lift the iron shoe upward;

[0009] a second elastic member, the high end of which is articulated with the bogie, and the low end of which is articulated with the connecting rod, for pushing the connecting rod upward or downward when the other end of the shoe is away from or close to the wheel set and the track, respectively.

[0010] Further, the connecting rod is of a bent structure, and has a first segment and a second segment fixedly connected, the included angle b formed by the first segment and the second segment is toward the wheel set, the high end of the first segment is articulated with the bogie, and the low end of the second segment is articulated with one end of the shoe.

[0011] Further, the telescopic drive member is arranged above the connecting rod, and the low end of the telescopic drive member is articulated with the middle part of the first segment.

[0012] Further, the telescopic drive member is a double-acting cylinder.

[0013] Further, the first elastic member is arranged obliquely between the connecting rod and the wheel set, and below the telescopic drive member, the high end of the first elastic member is articulated with the middle part of the second segment, and the low end of the first elastic member is articulated with the middle part of the shoe.

[0014] Further, the first elastic member is a first spring.

[0015] Further, the second elastic member is arranged obliquely above the first elastic member, and below the telescopic drive member, the high end of the second elastic member is arranged between the connecting rod and the wheel set, and above the high end of the connecting rod, the low end of the second elastic member is articulated with the connecting part of the first segment and the second segment, the second elastic member is always in a stretched state, a first connecting line is set between the high end articulation point and the low end articulation point of the second elastic member, a second connecting line is set between the high end articulation point of the second elastic member and the high end articulation point of the connecting rod, when the first connecting line is above the second connecting line, the second elastic member exerts an upward pushing force on the connecting rod, and when the first connecting line is below the second connecting line, the second elastic member exerts a downward pushing force on the connecting rod.

[0016] Further, the second elastic member is a second spring.

[0017] Further, the locomotive shoe self-retracting mechanism further comprises a monitoring unit, which is electrically connected with the telescopic drive member, for monitoring the use state of the shoe, and controlling the start and stop of the telescopic drive member.

[0018] Furthermore, the monitoring unit includes two limit switches and a controller. Both limit switches are located on the first segment and are used to monitor whether the wheel shoe is in a parked or retracted state. The input terminal of the controller is electrically connected to the two limit switches to obtain the monitoring information of the two limit switches. The output terminal of the controller is electrically connected to the telescopic drive component to control the start and stop of the telescopic drive component.

[0019] Compared with the prior art, the beneficial effects of the present invention include: when the parking function is performed, the telescopic drive component is activated and drives the connecting rod to rotate, so that the lower end of the connecting rod approaches the wheelset and the track, until the other end of the brake shoe abuts into the angle α formed by the wheelset and the track, and the brake shoe comes into contact with the wheelset and the track, thus performing the braking function. When the other end of the brake shoe abuts into the angle α formed by the wheelset and the track, the first elastic element is in a stretched state and lifts the brake shoe upward, so that the upper surface of the other end of the brake shoe presses against the wheelset. When the other end of the brake shoe abuts into the angle α formed by the wheelset and the track, the second elastic element pushes the connecting rod downward, so that the lower surface of the other end of the brake shoe abuts against the track. When the track is retracted, the first elastic element pulls the track upward, moving the other end of the track away from the wheelset and track. The second elastic element pushes the connecting rod upward. This track retraction mechanism, if the track is in a braking state and the telescopic drive is leaking air, can use the elastic action of the first and second elastic elements to keep the track pressed against the wheelset and track, maintaining the braking effect and allowing the locomotive to remain parked. If the track is in a retracted state and the telescopic drive is leaking air, the first elastic element pulls the track upward, and the second elastic element pushes the connecting rod upward, keeping the track in the retracted state and preventing the track from being lowered and affecting the normal operation of the locomotive. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a locomotive track shoe self-retraction mechanism provided by the present invention;

[0021] Figure 2 yes Figure 1 A schematic diagram of the structure of a locomotive track shoe self-retraction mechanism when the second elastic element is at the critical point;

[0022] Figure 3 yes Figure 1 A schematic diagram of the structure of a locomotive track shoe self-retraction and deployment mechanism when the track shoe is in the parking state;

[0023] In the diagram: 1 - rail, 2 - wheelset, 3 - wheel shoe, 4 - bogie, 100 - connecting rod, 110 - first section, 120 - second section, 200 - telescopic drive component, 300 - first elastic component, 400 - second elastic component. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0025] This invention provides a locomotive track shoe self-retraction and deployment mechanism, which is disposed directly above the rail 1 and behind the wheelset 2, for retracting and deploying the track shoe 3, and its structure is as follows. Figure 1 - Figure 3 As shown, the system includes a connecting rod 100, a telescopic drive member 200, a first elastic member 300, and a second elastic member 400. The high end of the connecting rod 100 is hinged to the bogie 4, and the low end of the connecting rod 100 is hinged to one end of the wheel shoe 3. The high end of the telescopic drive member 200 is hinged to the bogie 4, and the low end of the telescopic drive member 200 is hinged to the connecting rod 100. This drive member is used to drive the connecting rod 100 to rotate, causing the low end of the connecting rod 100 to move closer to or further away from the wheelset 2 and the track, and causing the wheel shoe 3 to... The other end of the first elastic element 300 is inserted into or removed from the angle α formed by the wheelset 2 and the track; the high end of the first elastic element 300 is hinged to the connecting rod 100, and the low end of the first elastic element 300 is hinged to the shoe 3, for lifting the shoe 3 upward; the high end of the second elastic element 400 is hinged to the bogie 4, and the low end of the second elastic element 400 is hinged to the connecting rod 100, for pushing the connecting rod 100 upward or downward respectively when the other end of the shoe 3 moves away from or near the wheelset 2 and the track.

[0026] When the parking function is activated, the telescopic drive 200 starts and drives the connecting rod 100 to rotate, causing the lower end of the connecting rod 100 to approach the wheelset 2 and the track, until the other end of the wheel shoe 3 abuts against the angle α formed by the wheelset 2 and the track. The wheel shoe 3 then comes into contact with the wheelset 2 and the track, activating the braking function. When the other end of the wheel shoe 3 abuts against the angle α formed by the wheelset 2 and the track, the first elastic element 300 is in a stretched state and pulls the wheel shoe 3 upward, causing the upper surface of the other end of the wheel shoe 3 to press against the wheelset 2. When the other end of the wheel shoe 3 abuts against the angle α formed by the wheelset 2 and the track, the second elastic element 400 pushes the connecting rod 100 downward, causing the lower surface of the other end of the wheel shoe 3 to press against the track. When the wheel shoe 3 is retracted, the first elastic element 300... When the first elastic element 300 is pulled upwards, the other end of the shoe 3 moves away from the wheelset 2 and the track. The second elastic element 400 pushes the connecting rod 100 upwards. This shoe retraction mechanism allows the shoe 3 to maintain its braking effect when it is in the braking state. If the telescopic drive element 200 leaks air, the elasticity of the first elastic element 300 and the second elastic element 400 will cause the shoe 3 to press against the wheelset 2 and the track, thus keeping the locomotive in a parked state. If the first elastic element 3 is pulled upwards, the second elastic element 400 will push the connecting rod 100 upwards, keeping the shoe 3 in the retracted state and preventing the shoe 3 from being lowered and affecting the normal operation of the locomotive.

[0027] As a preferred embodiment, please refer to Figure 1 and Figure 3 The other end of the brake shoe 3 has a pointed structure, which makes it easy for the other end of the brake shoe 3 to abut against the angle α formed by the wheelset 2 and the track. When the brake shoe 3 is used for braking, the braking force comes from three aspects: first, the frictional force exerted by the locomotive's own weight on the contact surface between the brake shoe 3 and the wheelset 2; second, the thrust exerted by the telescopic drive member 200 on the brake shoe 3 through the connecting rod 100; and third, the elastic force exerted by the first elastic member 300 and the second elastic member 400 on the brake shoe 3.

[0028] As a preferred embodiment, please refer to Figure 3 The connecting rod 100 has a bent structure and has a first section 110 and a second section 120 that are fixedly connected. The included angle b formed by the first section 110 and the second section 120 is directed toward the wheelset 2. The high end of the first section 110 is hinged to the bogie 4, and the low end of the second section 120 is hinged to one end of the wheel shoe 3. The connecting rod 100 has a rigid structure. When the wheelset 2 is pressed on the wheel shoe 3, the connecting rod 100 structure can automatically adapt to the sway angle position. When parking, the braking force will not cause additional force to the connecting rod 100 structure itself, ensuring reliable use of the mechanism.

[0029] As a preferred embodiment, please refer to Figure 3 The telescopic drive member 200 is disposed above the connecting rod 100. The lower end of the telescopic drive member 200 is hinged to the middle part of the first segment 110, so that the telescopic drive member 200 can drive the connecting rod 100 to rotate a large range with a small extension stroke.

[0030] In a preferred embodiment, a waist-shaped groove extending along the length of the first segment 110 is provided at the middle part of the first segment 110. The lower end of the telescopic drive member 200 is slidably disposed in the waist-shaped groove via a pin shaft, adaptively reducing the error caused by shock deformation. When the wheelset 2 presses on the wheel shoe 3, the connecting rod 100 structure can automatically adapt to the swing angle position. When parking, the braking force will not cause additional force to the connecting rod 100 structure itself, ensuring reliable use of the mechanism.

[0031] In a preferred embodiment, the telescopic drive component 200 is a bidirectional cylinder. The first telescopic end of the telescopic drive component 200 is hinged to the bogie 4, and the second telescopic end of the telescopic drive component 200 is hinged to the middle of the first segment 110. When the parking function is activated, the coil on one side of the electromagnetic reversing valve is energized, and air is supplied from the main air cylinder to one side cavity of the bidirectional cylinder, driving the connecting rod 100 to rotate. This causes the lower end of the connecting rod 100 to gradually approach the wheelset 2 and the track, and the other end of the wheel shoe 3 first contacts the wheelset 2. Under the pressure of 2, the iron shoe 3 begins to rotate around the connecting rod 100. The first elastic element 300 stretches until the other end of the iron shoe 3 is completely inserted into the angle α formed by the wheel set 2 and the track. The solenoid valve is de-energized and returns to the neutral position. The double-acting cylinder is sealed and pressurized. At this time, the first elastic element 300 is in a stretched state and lifts the iron shoe 3 upward, so that the upper surface of the other end of the iron shoe 3 presses against the wheel set 2. The second elastic element 400 pushes the connecting rod 100 downward, so that the lower surface of the other end of the iron shoe 3 presses against the track. Under the action of the first elastic element 300 and the second elastic element 400, the wheel shoe 3 can tightly abut against the wheelset 2 and the track. Even if the bidirectional cylinder leaks air, the wheel shoe 3 can maintain the parking state, achieving a long-term anti-slip function without energy consumption. When the wheel shoe 3 is retracted, the coil on the other side of the electromagnetic reversing valve is energized, and air is supplied from the main air cylinder to the other cavity of the bidirectional cylinder, driving the connecting rod 100 to rotate, so that the lower end of the connecting rod 100 gradually moves away from the wheelset 2 and the track. When the wheel shoe 3 reaches the retracted position... When the locomotive is in operation, the first elastic element 300 pulls the iron shoe 3 upward, and the second elastic element 400 pushes the connecting rod 100 upward. The iron shoe 3 is in a retracted state. At this time, the second elastic element 400 resists the weight of the iron shoe 3 itself. In order to improve the structural reliability, when the locomotive is retracting the iron shoe 3 and operating normally, it continuously supplies power to the electromagnetic reversing valve so that the bidirectional cylinder is always ventilated and in a retracted state. When the iron shoe 3 is pressed and cannot be retracted, it can automatically and quickly rebound by simply controlling the locomotive to move back and forth slightly.

[0032] As a preferred embodiment, please refer to Figure 1 and Figure 3 The first elastic element 300 is inclinedly disposed between the connecting rod 100 and the wheel set 2, and located below the telescopic drive member 200. The high end of the first elastic element 300 is hinged to the middle part of the second segment 120, and the low end of the first elastic element 300 is hinged to the middle part of the iron shoe 3.

[0033] As a preferred embodiment, please refer to Figure 1 The first elastic element 300 is a first spring, which can apply an upward pulling force to the iron shoe 3.

[0034] As a preferred embodiment, please refer toFigure 2 and Figure 3 The second elastic element 400 is inclinedly disposed directly above the first elastic element 300 and below the telescopic drive element 200. The high end of the second elastic element 400 is disposed between the connecting rod 100 and the wheel set 2 and above the high end of the connecting rod 100. The low end of the second elastic element 400 is hinged to the connection between the first segment 110 and the second segment 120. The second elastic element 400 is always in a stretched state. The high end hinge point and the low end hinge point of the second elastic element 400 are set to form a first line. The high-end hinge point and the high-end hinge point of the connecting rod 100 form a second line. When the first line is above the second line, the second elastic element 400 applies an upward pushing force to the connecting rod 100. When the first line is below the second line, the second elastic element 400 applies a downward pushing force to the connecting rod 100. Thus, when the shoe 3 is in the braking state, the second elastic element 400 pushes the shoe 3 downward. When the shoe 3 reaches the retracted position, the second elastic element 400 pushes the connecting rod 100 upward.

[0035] As a preferred embodiment, please refer to Figure 1 The second elastic element 400 is a second spring, which can apply an upward or downward pushing force to the iron shoe 3.

[0036] In a preferred embodiment, the locomotive track shoe self-retraction mechanism further includes a monitoring unit. The monitoring unit is electrically connected to the telescopic drive component 200 to monitor the usage status of the track shoe 3 and control the start and stop of the telescopic drive component 200. When the monitoring unit detects that the track shoe 3 is in a parking state or a retracted state, it will control the action of the telescopic drive component 200.

[0037] In a preferred embodiment, the monitoring unit includes two limit switches and a controller. Both limit switches are located on the first segment 110 and are used to monitor whether the wheel chock 3 is in a parking or retracted state. The input terminal of the controller is electrically connected to the two limit switches to obtain their monitoring information. The output terminal of the controller is electrically connected to the telescopic drive component 200 to control its start and stop. Through real-time communication between the controller and the limit switches, the parking operation can only be performed when the vehicle is stopped, and the locomotive can only operate normally when the wheel chock 3 is retracted and the limit switches receive a signal.

[0038] To better understand this invention, the following is combined with... Figure 1 - Figure 3 The working principle of the technical solution of the present invention will be described in detail below:

[0039] When the parking function is activated, the coil on one side of the solenoid directional valve is energized, supplying air from the main air cylinder to one side of the bidirectional cylinder, driving the connecting rod 100 to rotate. This causes the lower end of the connecting rod 100 to gradually approach the wheelset 2 and the track. The other end of the wheel shoe 3 first contacts the wheelset 2. Under the pressure of the wheelset 2, the wheel shoe 3 begins to rotate around the connecting rod 100, stretching the first elastic element 300 until the other end of the wheel shoe 3 is completely inserted into the angle α formed by the wheelset 2 and the track. The solenoid valve then de-energizes and returns to the neutral position, and the bidirectional cylinder is sealed. Under pressure, the first elastic element 300 is in a stretched state and pulls the shoe 3 upward, causing the upper surface of the other end of the shoe 3 to press against the wheelset 2. The second elastic element 400 pushes the connecting rod 100 downward, causing the lower surface of the other end of the shoe 3 to press against the track. Under the action of the first elastic element 300 and the second elastic element 400, the shoe 3 can tightly press against the wheelset 2 and the track. Even if the bidirectional cylinder leaks air, the shoe 3 can maintain its parking state, achieving a long-term, energy-free anti-slip function. When the shoe 3 is retracted, the coil on the other side of the electromagnetic reversing valve is energized, supplying air from the main air cylinder to the other cavity of the bidirectional cylinder, and driving the connecting rod 100 to rotate, causing the lower end of the connecting rod 100 to gradually move away from the wheelset 2 and the track. When the shoe 3 reaches the retracted position, the first elastic element 300 pulls the shoe 3 upward, and the second elastic element 400 pushes the connecting rod 100 upward, putting the shoe 3 in the retracted state. This shoe retraction mechanism, if the shoe 3 is in the braking state, the telescopic drive element 200... If air leaks, the elastic action of the first elastic element 300 and the second elastic element 400 will cause the shoe 3 to press against the wheelset 2 and the track, maintaining the braking effect and allowing the locomotive to remain parked. If the shoe 3 is in the retracted state and the telescopic drive component 200 leaks air, the first elastic element 300 will pull the shoe 3 upward, and the second elastic element 400 will push the connecting rod 100 upward, keeping the shoe 3 in the retracted state and preventing the shoe 3 from being lowered and affecting the normal operation of the locomotive.

[0040] The locomotive track shoe self-retraction mechanism provided by the present invention has the following beneficial effects:

[0041] (1) This self-retracting and extending iron shoe mechanism does not require changing the original locomotive braking method. It only needs to draw a control air path from the main air cylinder, control the air supply of the bidirectional air cylinder through the solenoid valve, retract and extend the iron shoe 3, monitor the position status of the iron shoe 3 through the limit switch, and interconnect with the whole vehicle control system. It is simple to operate and has high reliability.

[0042] (2) Through real-time communication between the controller and the limit switch, the parking operation can be performed only when the vehicle is in a stopped state, the iron shoe 3 is retracted, and the locomotive can only operate normally when the limit switch receives a signal;

[0043] (3) In this self-retracting mechanism, when the iron shoe 3 is in the braking state, under the action of the first elastic member 300 and the second elastic member 400, the iron shoe 3 can be tightly pressed against the wheel set 2 and the track. Even if the bidirectional cylinder leaks air, the iron shoe 3 can maintain the parking state and realize the long-term anti-slip function without energy consumption. When the iron shoe 3 is in the retracted state, the first elastic member 300 pulls the iron shoe 3 upward and the second elastic member 400 pushes the connecting rod 100 upward. Even if the bidirectional cylinder leaks air, the iron shoe 3 can maintain the retracted state.

[0044] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A locomotive track shoe self-retrieval mechanism, disposed directly above the rail and behind the wheelset, for retrieving and retrieving track shoes, characterized in that, include: The connecting rod has its high end hinged to the bogie and its low end hinged to one end of the wheel shoe. The connecting rod is a bent structure and has a first segment and a second segment that are fixedly connected. The included angle b formed by the first segment and the second segment faces the wheelset. The high end of the first segment is hinged to the bogie, and the low end of the second segment is hinged to one end of the wheel shoe. A telescopic drive component, with its high end hinged to the bogie and its low end hinged to the connecting rod, is used to drive the connecting rod to rotate, so that the low end of the connecting rod approaches or moves away from the wheelset and the track, and the other end of the wheel shoe abuts into or moves out of the angle α formed by the wheelset and the track; The first elastic element has its high end hinged to the connecting rod and its low end hinged to the iron shoe, and is used to lift the iron shoe upward. The first elastic element is inclinedly disposed between the connecting rod and the wheelset and located below the telescopic drive member. The high end of the first elastic element is hinged to the middle of the second section and the low end of the first elastic element is hinged to the middle of the iron shoe. The second elastic element has its high end hinged to the bogie and its low end hinged to the connecting rod. When the other end of the wheel shoe moves away from or near the wheelset and the track, it pushes the connecting rod upward or downward, respectively. The second elastic element is inclinedly positioned directly above the first elastic element and below the telescopic drive element. The high end of the second elastic element is positioned between the connecting rod and the wheelset and above the high end of the connecting rod. The low end of the second elastic element is hinged to the connection between the first segment and the second segment. The second elastic element is always in a stretched state. A first line is formed between the high end hinge point and the low end hinge point of the second elastic element, and a second line is formed between the high end hinge point of the second elastic element and the high end hinge point of the connecting rod. When the first line is above the second line, the second elastic element applies an upward thrust to the connecting rod. When the first line is below the second line, the second elastic element applies a downward thrust to the connecting rod.

2. The locomotive track shoe self-retraction mechanism according to claim 1, characterized in that, The telescopic drive component is located above the connecting rod, and the lower end of the telescopic drive component is hinged to the middle of the first segment.

3. The locomotive track shoe self-retraction mechanism according to claim 2, characterized in that, The telescopic drive component is a two-way cylinder.

4. The locomotive track shoe self-retraction mechanism according to claim 1, characterized in that, The first elastic element is a first spring.

5. The locomotive track shoe self-retraction mechanism according to claim 1, characterized in that, The second elastic element is a second spring.

6. The locomotive track shoe self-retraction mechanism according to claim 1, characterized in that, It also includes a monitoring unit, which is electrically connected to the telescopic drive component to monitor the usage status of the iron shoe and control the start and stop of the telescopic drive component.

7. The locomotive track shoe self-retraction mechanism according to claim 6, characterized in that, The monitoring unit includes two limit switches and a controller. The two limit switches are both located on the first segment and are used to monitor whether the wheel shoe is in the parking or retracted state. The input terminal of the controller is electrically connected to the two limit switches to obtain the monitoring information of the two limit switches. The output terminal of the controller is electrically connected to the telescopic drive to control the start and stop of the telescopic drive.

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