Obstacle crossing mechanism of sweeping robot

Abstract

The invention discloses a sweeping robot obstacle crossing mechanism, and particularly relates to the technical field of sweeping robots, the sweeping robot obstacle crossing mechanism comprises a sweeping robot body and a fixing frame, the bottom of the sweeping robot body is fixedly connected with a mounting plate, and the left side and the right side of the bottom of the mounting plate are each provided with a moving groove and a fixing groove; and the mounting assembly comprises a spring fixedly connected into the fixing groove, the left end of the spring is fixedly connected with a limiting clamping block, an inclined groove is formed in the limiting clamping block, and a moving column is slidably connected into the inclined groove. Through cooperative work of the mounting assembly, the lifting assembly and the cleaning assembly, the device can be automatically adjusted according to the actual use condition and can be accurately adjusted according to the height of an obstacle object, so that the sweeping robot can effectively cross the obstacle, the use range can be prevented from being limited, and the practicability is high. And therefore, the practicability of the device is further improved, and the cleaning range and efficiency of the sweeping robot are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sweeping robots, and in particular to an obstacle surmounting mechanism of a sweeping robot. Background Art

[0002] With the development of science and technology, robots can often be seen in production and life. Robots can assist or replace human labor to complete certain operations. In order to expand the scope of operation, some robots also have the function of automatic walking, such as sweeping robots. When sweeping robots are actually used, they need to use obstacle crossing mechanisms to overcome obstacles. In the prior art, a cantilever connecting rod is generally used to cross obstacles during walking. Since the length of the cantilever connecting rod is fixed, the height it can cross is limited. In addition, its form and effect are single when in use and it cannot be adjusted according to actual usage, resulting in a limited scope of use. Summary of the invention

[0003] In order to achieve the above object, the present invention provides the following technical solutions: A sweeping robot obstacle crossing mechanism comprises: a sweeping robot body and a fixing frame, wherein a mounting plate is fixedly connected to the bottom of the sweeping robot body, and a moving groove and a fixing groove are provided on both left and right sides of the bottom of the mounting plate; An installation component, the installation component includes a spring fixedly connected in a fixed groove, the left end of the spring is fixedly connected to a limit block, an oblique groove is provided in the limit block, a moving column is slidably connected in the oblique groove, the front and rear ends of the moving column are fixedly connected to connecting blocks, the bottom ends of the two connecting blocks are fixedly connected to the same moving block, and the left and right sides of the moving block are provided with slots; A lifting assembly, the lifting assembly includes a first electric push rod fixedly connected to the top of the fixed frame, a baffle is fixedly connected to the bottom of the moving block, both sides of the baffle and the fixed frame are provided with slide grooves, two slide grooves are slidably connected to two sliders, the two ends of the four sliders are hinged to the same telescopic frame through pins, the top of the fixed frame is fixedly connected to a controller, the bottom of the fixed frame is fixedly connected to a connecting rod, and the front side of the connecting rod is provided with an infrared transmitter and an infrared receiver; A cleaning component, which includes a connecting seat fixedly connected to the bottom of the fixed frame, a dual-axis motor fixedly connected to the top of the connecting seat, a rotating rod fixedly connected to the output front end of the dual-axis motor, a limiting column fixedly connected to the front side of the rotating rod, a moving frame slidably connected to the outside of the limiting column, a supporting rod fixedly connected to the front side of the moving frame, and a cleaning rod fixedly connected to the front end of the supporting rod.

[0004] In one possible implementation, the output rear end of the dual-axis motor is fixedly connected to a fan blade, a dust cover is provided outside the fan blade, the side of the dust cover is connected to the dust storage box in the sweeping robot body through a conveying hose, the bottom of the dust cover is connected to a dust hood through a connecting hose, the shape of the dust hood is L-shaped, and the dust hood is fixedly connected to the bottom of the connecting seat.

[0005] In a possible implementation, a fixed motor is fixedly connected to the right side of the fixed frame, a driving wheel is fixedly connected to the output end of the fixed motor, the driving wheel is connected to a driven wheel through a conveyor belt transmission, a rotating shaft is fixedly connected inside the driven wheel, a moving wheel is fixedly connected outside the rotating shaft, a protective cover is provided outside the moving wheel, the rotating shaft is rotatably connected inside the protective cover, and the protective cover is fixedly connected to the right side of the fixed frame.

[0006] In a possible implementation, a limiting groove is provided on the top of the connecting seat, and the bottom end of the movable frame is slidably connected in the limiting groove.

[0007] In a possible implementation, the cleaning rod is arc-shaped, and the cleaning rod abuts against the outside of the moving wheel.

[0008] In a possible implementation, the sliding groove and the sliding block are both T-shaped, and two limit blocks are fixedly connected to the top of the fixing frame.

[0009] In a possible implementation, both ends of the two limit blocks that are close to each other are provided with buffer pads that abut against the outside of the corresponding two sliding blocks, and the top of the first electric push rod abuts against the bottom of the mounting plate.

[0010] In a possible implementation, the bottom end of the mounting plate is fixedly connected to two support blocks, the two adjacent sides of the two support blocks are fixedly connected with elastic telescopic rods, the two adjacent ends of the two elastic telescopic rods are fixedly connected with clamping columns, the bottoms of the two clamping columns are provided with handles, the two clamping columns are slidably connected in corresponding clamping grooves, the moving block is slidably connected in the moving groove, the limiting clamping block is slidably connected in the fixed groove, the moving groove and the fixed groove are connected, the top of the connecting seat is fixedly connected with a telescopic fixing rod, the top of the telescopic fixing rod is fixedly connected to the bottom of the sweeping robot body, the rotating shaft is fixedly connected outside, the fixed wheel is fixedly connected outside with a second electric push rod, and the telescopic end of the second electric push rod is fixedly connected to a supporting leg.

[0011] In a possible implementation, the positive electrode of the infrared transmitter is electrically connected to the power output terminal of the controller, the negative electrode of the infrared transmitter is electrically connected to the ground wire of the controller through a current limiting resistor, a universal pin of the controller is electrically connected to the positive electrode of the infrared transmitter, the power pin of the infrared receiver is electrically connected to the power output terminal of the controller, the ground pin of the infrared receiver is electrically connected to the ground wire of the controller, the output pin of the infrared receiver is electrically connected to another universal pin of the controller, the input terminals of the first electric push rod and the second electric push rod are both electrically connected to an external power supply, and the universal pin of the controller is electrically connected to the control terminals of the first electric push rod and the second electric push rod through a relay.

[0012] In the above technical solution, the technical effects and advantages provided by the present invention are: 1. Through the coordinated work of the installation component, the lifting component and the cleaning component, the device can be automatically adjusted according to the actual usage situation, and can be accurately adjusted according to the height of the obstacle. Not only can the sweeping robot effectively cross the obstacles, but also it can avoid the limitation of the use range, thereby further improving the practicality of the device and increasing the cleaning range and efficiency of the sweeping robot.

[0013] 2. By installing components, the device can be quickly installed and disassembled, which is convenient for subsequent maintenance and replacement of the device. It is not only easy to use, but also further improves the service life of the sweeping robot.

[0014] 3. Through the cleaning component, the device can automatically clean the moving wheels when moving, avoiding the actual cleaning effect being affected by dust adhering to the moving wheels during the cleaning process, thereby ensuring the cleaning efficiency of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the connection between the cleaning robot body and the mounting plate of the present invention; Figure 3 This is a schematic diagram of the structure of the connection between the driven wheel and the rotating shaft of the present invention; Figure 4 It is a structural schematic diagram of the connection between the fixing frame and the controller of the present invention; Figure 5It is a structural schematic diagram of the connection between the fixing frame and the connecting rod of the present invention; Figure 6 This is a schematic diagram of the structure of the connection between the connecting base and the dual-axis motor of the present invention; Figure 7 It is a schematic diagram of the structure of the connection between the dual-axis motor and the fan blades of the present invention; Figure 8 It is a schematic structural diagram of the connection between the limit block and the spring of the present invention.

[0017] Description of reference numerals: 1. Robot vacuum cleaner body; 2. Fixing frame; 3. Mounting plate; 4. Moving slot; 5. Fixing slot; 6. Spring; 7. Limiting block; 8. Inclined slot; 9. Moving column; 10. Connecting block; 11. Moving block; 12. Slot; 13. First electric push rod; 14. Baffle; 15. Slide; 16. Sliding block; 17. Telescopic frame; 18. Controller; 19. Connecting rod; 20. Infrared transmitter; 21. Infrared receiver; 22. Connecting seat; 23. Dual-axis motor; 24. Rotating Moving rod; 25, limiting column; 26, moving frame; 27, supporting rod; 28, cleaning rod; 29, fan blade; 30, dust cover; 31, dust cover; 32, fixed motor; 33, driving wheel; 34, driven wheel; 35, rotating shaft; 36, moving wheel; 37, protective cover; 38, limiting groove; 39, limiting block; 40, supporting block; 41, elastic telescopic rod; 42, clamping column; 43, telescopic fixing rod; 44, fixed wheel; 45, second electric push rod; 46, supporting leg. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0019] The embodiments of the present application solve the problems in the prior art by providing an obstacle surmounting mechanism for a sweeping robot.

[0020] The technical solution in the embodiment of the present application is to solve the above problems, and the overall idea is as follows: Embodiment 1: The specific structure of this embodiment is as follows: Figure 1-Figure 8 As shown, a sweeping robot obstacle crossing mechanism comprises: a sweeping robot body 1 and a fixing frame 2, the bottom of the sweeping robot body 1 is fixedly connected with a mounting plate 3, and the bottom left and right sides of the mounting plate 3 are both provided with a moving groove 4 and a fixing groove 5; The installation assembly includes a spring 6 fixedly connected in the fixed groove 5, the left end of the spring 6 is fixedly connected to a limit block 7, an inclined groove 8 is provided in the limit block 7, a moving column 9 is slidably connected in the inclined groove 8, the front and rear ends of the moving column 9 are fixedly connected to connecting blocks 10, the bottom ends of the two connecting blocks 10 are fixedly connected to the same moving block 11, and the left and right sides of the moving block 11 are provided with slots 12; The lifting assembly includes a first electric push rod 13 fixedly connected to the top of the fixed frame 2, a baffle 14 fixedly connected to the bottom of the moving block 11, a slide groove 15 is provided on both sides of the baffle 14 and the fixed frame 2, two slides 16 are slidably connected in the two slide grooves 15, and the two ends of the four slides 16 are hinged with the same telescopic frame 17 through a pin shaft, a controller 18 is fixedly connected to the top of the fixed frame 2, and a connecting rod 19 is fixedly connected to the bottom of the fixed frame 2, and an infrared transmitter 20 and an infrared receiver 21 are provided on the front side of the connecting rod 19; The cleaning component includes a connecting seat 22 fixedly connected to the bottom of the fixed frame 2, a dual-axis motor 23 fixedly connected to the top of the connecting seat 22, a rotating rod 24 fixedly connected to the output front end of the dual-axis motor 23, a limiting column 25 fixedly connected to the front side of the rotating rod 24, a moving frame 26 slidably connected to the outside of the limiting column 25, a supporting rod 27 fixedly connected to the front side of the moving frame 26, a cleaning rod 28 fixedly connected to the front end of the supporting rod 27.

[0021] In some examples, the output rear end of the dual-axis motor 23 is fixedly connected to a fan blade 29, and a dust cover 30 is provided outside the fan blade 29. The side of the dust cover 30 is connected to the dust storage box in the sweeping robot body 1 through a conveying hose, and the bottom of the dust cover 30 is connected to a dust hood 31 through a connecting hose. The shape of the dust hood 31 is L-shaped, and the dust hood 31 is fixedly connected to the bottom of the connecting seat 22.

[0022] In some examples, a fixed motor 32 is fixedly connected to the right side of the fixed frame 2, a driving wheel 33 is fixedly connected to the output end of the fixed motor 32, the driving wheel 33 is connected to a driven wheel 34 through a conveyor belt transmission, a rotating shaft 35 is fixedly connected inside the driven wheel 34, a moving wheel 36 is fixedly connected outside the rotating shaft 35, a protective cover 37 is provided outside the moving wheel 36, the rotating shaft 35 is rotatably connected inside the protective cover 37, and the protective cover 37 is fixedly connected to the right side of the fixed frame 2; Through the design of the dust cover 30, the conveying hose and the dust storage box, the device can effectively collect and store dust and maintain the hygiene of the cleaning process.

[0023] In some examples, a limiting groove 38 is provided on the top of the connecting seat 22. By providing the limiting groove 38, the mobile frame 26 can be prevented from being offset and stuck during movement, thereby ensuring the stable movement of the mobile frame 26. The bottom end of the mobile frame 26 is slidably connected in the limit groove 38, the cleaning rod 28 is arc-shaped, and the cleaning rod 28 abuts against the outside of the mobile wheel 36. The shape of the slide groove 15 and the slider 16 are both T-shaped. The top of the fixed frame 2 is fixedly connected to two limit blocks 39, and the two ends of the two limit blocks 39 that are close to each other are provided with buffer pads abutting against the outside of the corresponding two sliders 16. The design of the telescopic frame 17 and the buffer pad increases the stability of the device in the obstacle crossing process, while reducing the potential damage to the sweeping robot and obstacles; The top of the first electric push rod 13 abuts against the bottom of the mounting plate 3 .

[0024] In some examples, two support blocks 40 are fixedly connected to the bottom end of the mounting plate 3, elastic telescopic rods 41 are fixedly connected to the adjacent two sides of the two support blocks 40, and clamping columns 42 are fixedly connected to the adjacent two ends of the two elastic telescopic rods 41, and handles are provided at the bottoms of the two clamping columns 42, and the two clamping columns 42 are respectively slidably connected in the corresponding clamping grooves 12, the moving block 11 is slidably connected in the moving groove 4, the limit clamping block 7 is slidably connected in the fixed groove 5, the moving groove 4 and the fixed groove 5 are connected, and a telescopic fixed rod 43 is fixedly connected to the top of the connecting seat 22, and the top of the telescopic fixed rod 43 is fixedly connected to the bottom of the sweeping robot body 1, the rotating shaft 35 is fixedly connected to the outside, and a second electric push rod 45 is fixedly connected to the outside of the fixed wheel 44, and the telescopic end of the second electric push rod 45 is fixedly connected to the support leg 46; By using the first electric push rod 13 and the second electric push rod 45, combined with the precise control of the controller 18, the lifting and supporting actions are made more precise, which helps the robot adapt to obstacles of different heights.

[0025] In some examples, the positive electrode of the infrared transmitter 20 is electrically connected to the power output terminal of the controller 18, the negative electrode of the infrared transmitter 20 is electrically connected to the ground wire of the controller 18 through a current limiting resistor, a universal pin of the controller 18 is electrically connected to the positive electrode of the infrared transmitter 20, the power pin of the infrared receiver 21 is electrically connected to the power output terminal of the controller 18, the ground pin of the infrared receiver 21 is electrically connected to the ground wire of the controller 18, the output pin of the infrared receiver 21 is electrically connected to another universal pin of the controller 18, and the pin is set to an input mode for reading a signal from the receiver. The input terminals of the first electric push rod 13 and the second electric push rod 45 are both electrically connected to an external power supply, and the universal pin of the controller 18 is electrically connected to the control terminals of the first electric push rod 13 and the second electric push rod 45 through a relay. The controller 18 can be programmed to output a pulse width modulation signal or a direct high or low level signal to control the extension and retraction of the first electric push rod 13 and the second electric push rod 45.

[0026] The working principle of the present invention is: When using the device, first slide the two moving blocks 11, the connecting block 10 and the moving column 9 into the corresponding moving grooves 4, and the moving column 9 can be inserted into the inclined groove 8, thereby driving the limit block 7 to slide and get stuck in the fixed groove 5, until the clamping column 42 can be inserted into the corresponding clamping groove 12 under the elastic force of the elastic telescopic rod 41; Then start the fixed motor 32 and the double-axis motor 23, the fixed motor 32 can drive the driving wheel 33 to rotate continuously, and drive the driven wheel 34, the rotating shaft 35 and the moving wheel 36 to rotate synchronously through the conveyor belt, and drive the fixed wheel 44, the second electric push rod 45 and the supporting leg 46 to rotate synchronously, so as to drive the sweeping robot body 1 to move, the two output ends of the double-axis motor 23 can drive the fan blades 29 and the rotating rod 24 to rotate continuously, and the rotating rod 24 drives the limiting column 25 to rotate at the same time, so that the moving frame 26 can drive the supporting rod 27 and the cleaning rod 28 to move back and forth in the limiting groove 38, so as to sweep away the dust adhered to the outside of the moving wheel 36, and when the fan blades 29 rotate continuously, negative pressure can be generated, so that the dust can be sucked into the dust cover 30 through the connecting hose and the dust cover 31, and can be discharged into the dust storage box through the conveying hose for centralized collection; When the sweeping robot body 1 is moving, the infrared transmitter 20 emits infrared light and irradiates the object, and the infrared receiver 21 detects the reflected infrared light. When the object approaches or reaches a certain position, the intensity of the reflected infrared light increases, and the infrared receiver 21 detects this change. The controller 18 can analyze the signal transmitted by the infrared receiver 21 to determine the height of the object. When the volume of the object is smaller than the volume between the two moving wheels 36, the controller 18 can control the first electric push rod 13 to start, and enable the first electric push rod 13 to push the sweeping robot body 1 upward to move to a suitable height. When it rises, it can drive the telescopic frame 17 to be in an extended state, and enable the corresponding two sliders 16 to slide toward each other in the slide groove 15, and the telescopic fixing rod 43 is in a stretched state, so that the sweeping robot body 1 can pass over the object. After passing over, the first electric push rod 13 can return to its original state, so that the telescopic frame 17 can be retracted. During the retraction process, the corresponding two sliders 16 can slide relatively in the slide groove 15 until they can be buffered by the buffer pad; When the volume of the object is larger than the two moving wheels 36 and the device as a whole needs to cross the obstacle, the controller 18 can control the second electric push rod 45 to start, and the second electric push rod 45 can push the support leg 46 to extend to an appropriate distance, and then rotate synchronously under the action of the fixed motor 32, so that the device can climb over the object.

[0027] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A sweeping robot obstacle crossing mechanism, characterized in that: include: A sweeping robot body (1) and a fixing frame (2), wherein the bottom of the sweeping robot body (1) is fixedly connected to a mounting plate (3), and the bottom of the mounting plate (3) is provided with a moving groove (4) and a fixing groove (5) on both left and right sides; An installation component, the installation component comprising a spring (6) fixedly connected in a fixing groove (5), the left end of the spring (6) being fixedly connected to a limit block (7), the limit block (7) being provided with an inclined groove (8), a moving column (9) being slidably connected in the inclined groove (8), the front and rear ends of the moving column (9) being fixedly connected to connecting blocks (10), the bottom ends of the two connecting blocks (10) being fixedly connected to the same moving block (11), and the left and right sides of the moving block (11) being provided with a slot (12); A lifting component, the lifting component comprising a first electric push rod (13) fixedly connected to the top of a fixed frame (2), a baffle (14) fixedly connected to the bottom of the moving block (11), a slide groove (15) being provided on both sides of the baffle (14) and the fixed frame (2) adjacent to each other, two sliders (16) being slidably connected in the two slide grooves (15), two adjacent ends of the four sliders (16) being hinged to the same telescopic frame (17) via pins, a controller (18) being fixedly connected to the top of the fixed frame (2), a connecting rod (19) being fixedly connected to the bottom of the fixed frame (2), and an infrared transmitter (20) and an infrared receiver (21) being provided on the front side of the connecting rod (19); A cleaning assembly, the cleaning assembly comprising a connecting seat (22) fixedly connected to the bottom of a fixed frame (2), a dual-axis motor (23) fixedly connected to the top of the connecting seat (22), a rotating rod (24) fixedly connected to the output front end of the dual-axis motor (23), a limiting column (25) fixedly connected to the front side of the rotating rod (24), a moving frame (26) slidably connected to the outside of the limiting column (25), a supporting rod (27) fixedly connected to the front side of the moving frame (26), and a cleaning rod (28) fixedly connected to the front end of the supporting rod (27).

2. The obstacle-crossing mechanism of a sweeping robot according to claim 1, characterized in that: The output rear end of the dual-axis motor (23) is fixedly connected to a fan blade (29), and a dust cover (30) is provided outside the fan blade (29). The side of the dust cover (30) is connected to a dust storage box in a sweeping robot body (1) via a delivery hose, and the bottom of the dust cover (30) is connected to a dust suction cover (31) via a connecting hose. The dust suction cover (31) is L-shaped and is fixedly connected to the bottom of the connecting seat (22).

3. The obstacle-crossing mechanism of a sweeping robot according to claim 1, characterized in that: A fixed motor (32) is fixedly connected to the right side of the fixed frame (2); an output end of the fixed motor (32) is fixedly connected to a driving wheel (33); the driving wheel (33) is connected to a driven wheel (34) via a conveyor belt transmission; a rotating shaft (35) is fixedly connected inside the driven wheel (34); a moving wheel (36) is fixedly connected outside the rotating shaft (35); a protective cover (37) is provided outside the moving wheel (36); the rotating shaft (35) is rotatably connected inside the protective cover (37); and the protective cover (37) is fixedly connected to the right side of the fixed frame (2).

4. The obstacle-crossing mechanism of a sweeping robot according to claim 1, characterized in that: A limiting groove (38) is provided on the top of the connecting seat (22), and the bottom end of the movable frame (26) is slidably connected in the limiting groove (38).

5. The obstacle-crossing mechanism of a sweeping robot according to claim 3, characterized in that: The cleaning rod (28) is arc-shaped, and the cleaning rod (28) abuts against the outside of the moving wheel (36).

6. The obstacle-crossing mechanism of a sweeping robot according to claim 1, characterized in that: The sliding groove (15) and the sliding block (16) are both T-shaped, and the top of the fixing frame (2) is fixedly connected to two limit blocks (39).

7. The obstacle-crossing mechanism of a sweeping robot according to claim 6, characterized in that: Both ends of the two limit blocks (39) that are close to each other are provided with buffer pads that abut against the outside of the corresponding two sliding blocks (16), and the top of the first electric push rod (13) abuts against the bottom of the mounting plate (3).

8. The obstacle-crossing mechanism of a sweeping robot according to claim 1, characterized in that: The bottom end of the mounting plate (3) is fixedly connected to two support blocks (40), and the two adjacent sides of the two support blocks (40) are fixedly connected to elastic telescopic rods (41), and the two adjacent ends of the two elastic telescopic rods (41) are fixedly connected to clamping columns (42). The bottoms of the two clamping columns (42) are provided with handles. The two clamping columns (42) are respectively slidably connected in corresponding clamping grooves (12). The moving block (11) is slidably connected in the moving groove (4), and the limit clamping block (7) is slidably connected in the fixed groove (5). The moving groove (4) and the fixed groove (5) are connected. The top of the connecting seat (22) is fixedly connected to a telescopic fixed rod (43), and the top of the telescopic fixed rod (43) is fixedly connected to the bottom of the sweeping robot body (1). The rotating shaft (35) is fixedly connected to the outside, and the fixed wheel (44) is fixedly connected to the outside of the second electric push rod (45), and the telescopic end of the second electric push rod (45) is fixedly connected to a support leg (46).

9. The obstacle-crossing mechanism of a sweeping robot according to claim 8, characterized in that: The positive electrode of the infrared transmitter (20) is electrically connected to the power output end of the controller (18), the negative electrode of the infrared transmitter (20) is electrically connected to the ground wire of the controller (18) through a current limiting resistor, a universal pin of the controller (18) is electrically connected to the positive electrode of the infrared transmitter (20), the power pin of the infrared receiver (21) is electrically connected to the power output end of the controller (18), the ground wire pin of the infrared receiver (21) is electrically connected to the ground wire of the controller (18), the output pin of the infrared receiver (21) is electrically connected to another universal pin of the controller (18), the input ends of the first electric push rod (13) and the second electric push rod (45) are both electrically connected to an external power supply, and the universal pin of the controller (18) is electrically connected to the control ends of the first electric push rod (13) and the second electric push rod (45) through a relay.

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