Folding mobile photovoltaic energy storage charger

Abstract

The application relates to the technical field of photovoltaic charging machines, and particularly discloses a folding mobile photovoltaic energy storage charging machine which comprises a device box and universal wheels installed on the lower surface of the device box; the upper surface of the device box is fixedly provided with a supporting box, the upper portion of the supporting box is provided with photovoltaic panels, all the photovoltaic panels are connected through folding mechanisms, the folding mechanisms comprise connecting strips arranged between two adjacent photovoltaic panels, the two sides of the connecting strips are respectively connected with corresponding photovoltaic panels through shafts, the inside of the supporting box is provided with a driving mechanism for stretching and folding the folding mechanisms, and the driving mechanism comprises a servo motor installed in the inside of the supporting box. The application can reduce the height of the photovoltaic panels after folding, thereby avoiding the overall height of the photovoltaic energy storage charging machine being too high, and the structure of the application is simple, the folding process is simple, so that the stability of the application can be improved, and the failure rate of the application in the folding process can be reduced.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic charger technology, specifically a foldable mobile photovoltaic energy storage charger. Background Technology

[0002] As the global energy structure shifts towards cleaner and distributed energy, solar photovoltaic power generation, as a renewable and zero-emission energy acquisition method, continues to increase its share in the energy supply system. At the same time, the rapid development of electrochemical energy storage technology enables the efficient storage and flexible dispatch of photovoltaic power generation. The deep integration of photovoltaics and energy storage has become an important development direction for new energy applications. In many application scenarios, the demand for mobile charging is growing. For example, emergency rescue, outdoor operations, field exploration, temporary power supply for large-scale events, and power supply in remote areas all place high demands on the portable access and flexible supply of electricity. To meet these needs, the industry has developed a variety of mobile power supply devices that integrate photovoltaic power generation, energy storage, and power output. These devices are usually equipped with photovoltaic modules for photoelectric conversion, energy storage batteries for energy storage, and charging interfaces or wireless charging modules to provide power to electrical equipment or vehicles. In terms of structural design, lightweight, modular, and retractable designs are gradually becoming the research and development trend for related equipment in order to achieve portable transportation and flexible deployment. For example, some portable photovoltaic equipment adopts foldable or rollable photovoltaic panel structures to reduce storage volume; some mobile energy storage equipment adopts modular battery pack designs, which are convenient to combine and configure according to capacity requirements; and some vehicle-mounted or towed charging equipment achieves rapid transfer of power supply equipment between different sites through the design of an overall mobile platform. Furthermore, with the advancement of power electronics and battery management technologies, photovoltaic energy storage charging equipment has also made corresponding progress in energy conversion efficiency, charging and discharging control accuracy, and compatibility with various types of loads, providing a technological foundation for building more integrated and convenient mobile photovoltaic energy storage charging equipment. Existing foldable mobile photovoltaic energy storage chargers, such as the one disclosed in CN118631136A, are self-folding mobile photovoltaic energy storage chargers. When in use, the photovoltaic panels on the left and right sides are in an unfolded state. When it is necessary to move the entire device, the motor can be started. At this time, the motor drives the threaded rod to rotate, and then the photovoltaic panel and auxiliary plate descend under the action of the limit block and the threaded rod. Then, under the action of the push rod, the photovoltaic panel rotates inward towards the upper frame, that is, the photovoltaic panels on the left and right sides are finally folded, which makes it convenient for the operator to move the entire device. However, the above-mentioned existing technology requires a relatively deep upper frame when in use. This is because when the photovoltaic panel is long, its height will be relatively high after folding. In order to accommodate the folded photovoltaic panel, the depth of the upper frame must be relatively deep. However, if the depth of the upper frame is made relatively deep, the height of the photovoltaic energy storage charger will be relatively high, which is not conducive to the rational use of space and will lead to a lot of space being wasted. Therefore, a foldable mobile photovoltaic energy storage charger is needed to solve the above problems. Summary of the Invention

[0003] The purpose of this invention is to provide a foldable mobile photovoltaic energy storage charger to solve the problem mentioned in the background art that existing foldable mobile photovoltaic energy storage chargers cannot make reasonable use of space.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A foldable mobile photovoltaic energy storage charger includes an equipment box and a support box fixedly connected to its upper surface. A photovoltaic panel is arranged on the top of the support box. All the photovoltaic panels are connected by a folding mechanism. The folding mechanism includes a connecting strip arranged between two adjacent photovoltaic panels. The two sides of the connecting strip are respectively connected to the shaft of the corresponding photovoltaic panel. The support box is provided with a drive mechanism for extending and folding the folding mechanism. The drive mechanism includes a servo motor installed inside the support box.

[0005] Preferably, the folding mechanism further includes a support rod axially connected to the end of the photovoltaic panel, and a U-shaped frame is provided below each photovoltaic panel, with the two ends of the U-shaped frame movably nested in the lower ends of the corresponding two support rods.

[0006] Preferably, a sliding frame is also provided below the photovoltaic panel, and both ends of the sliding frame are axially connected to connecting rods, which are axially connected to the corresponding U-shaped frame.

[0007] Preferably, the number of structures formed by the sliding frame and its two end connecting rods above the support box is one less than the number of photovoltaic panels, and the structures formed by the sliding frame and its two end connecting rods are spaced apart below the photovoltaic panels.

[0008] Preferably, the upper surface of the support box is provided with an n-shaped cover plate, and the U-shaped frame slides through the space formed by the lower surface of the cover plate and the upper surface of the support box, so as to enable the U-shaped frame to slide stably.

[0009] Preferably, a torsion spring is also provided between the connecting strip and the photovoltaic panel, so that the photovoltaic panel can automatically fold in a continuous W shape after all the U-shaped frames come close to each other.

[0010] Preferably, the upper surface of the photovoltaic panel is provided with a rubber strip, which is used to prevent dust and water stains from entering the photovoltaic surface of the photovoltaic panel through the gap between the adjacent photovoltaic panels after the adjacent photovoltaic panels are folded.

[0011] Preferably, the drive mechanism further includes a limiting plate that is slidably connected inside the support box, and a lead screw is threaded through the limiting plate. The lower end of the lead screw is fixedly connected to the shaft end of the servo motor, and the upper end of the lead screw is connected to the inner top of the support box by a bearing.

[0012] Preferably, the upper surface of the limiting plate is provided with a driven frame, and the driven frame extends movably through to the top of the support box. The upper end of the driven frame is provided with a sliding groove, and the sliding frame is slidably connected in the sliding groove.

[0013] Preferably, the leveling mechanism further includes a hydraulic oil tank installed on the bottom surface of the support box, and two hydraulic oil tanks are symmetrically arranged about the axis of the lead screw. The two hydraulic oil tanks are connected by a connecting pipe. Piston tubes are provided at the four corners of the lower surface of the equipment box, and piston columns are seamlessly slidably connected to the lower opening of each piston tube. Universal wheels are installed on the ends of the piston columns that extend out of the piston tubes. A pressure plate is seamlessly slidably connected to each hydraulic oil tank, and the pressure plate is sealed and movable through the upper end of the hydraulic oil tank and fixedly connected to the lower surface of the limiting plate. An oil supply pipe is also connected through each hydraulic oil tank, and a solenoid valve is installed on the oil supply pipe. There are four oil supply pipes, and the oil supply pipes connect the hydraulic oil tanks and the corresponding piston tubes. The openings of the oil supply pipes and the hydraulic oil tanks are located between the pressure plate and the upper opening of the hydraulic oil tanks. A microcontroller is also provided in the equipment box, and the microcontroller is connected to a dual-axis tilt sensor and a solenoid valve.

[0014] Compared with the prior art, the beneficial effects of the present invention are: the foldable mobile photovoltaic energy storage charger can reduce the height of the photovoltaic panel after folding, thereby avoiding the overall height of the photovoltaic energy storage charger being too high, and its structure is simple and the folding process is simple, thus improving its stability and helping to reduce its failure rate during the folding process. 1. By controlling the limit plate to move up and down through the servo motor, the sliding frame connected to the driven frame can move up and down synchronously. When the sliding frame moves up, it can bring the U-shaped frames connected to the connecting rods on both sides closer together, which can make the photovoltaic panel fold. When the sliding frame moves down, it can move the U-shaped frames connected to the connecting rods on both sides further apart, which is conducive to the unfolding of the photovoltaic panel. The unfolding and folding of the photovoltaic panel depends entirely on the mutual movement of the U-shaped frames, which makes the folding and unfolding process of the photovoltaic panel simple and helps to reduce the failure rate during the folding process. 2. By setting up multiple photovoltaic panels, the height after folding will be greatly reduced, which in turn can greatly reduce the space occupied after folding. This can prevent the overall height of the photovoltaic energy storage charger from being too large. In addition, rubber strips are set on the photovoltaic panels. When the photovoltaic panels are folded, the rubber strips squeeze each other to prevent dust and water stains from entering the photovoltaic surface through the gaps between the photovoltaic panels, thus protecting the photovoltaic surface. 3. During the unfolding of the photovoltaic panel, the microcontroller, solenoid valve, and dual-axis tilt sensor work together to deliver different amounts of hydraulic oil from the hydraulic tank to the four piston tubes through the oil supply pipe. This changes the height of the piston rods in the four piston tubes, thereby changing the height of the casters relative to the equipment box. This facilitates leveling the equipment box during the unfolding of the photovoltaic panel. Since the equipment box and the unfolded photovoltaic panel are parallel, the unfolded photovoltaic panel can be leveled in the end. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 For the present invention Figure 1 Enlarged structural diagram of point A in the middle; Figure 3 This is a partial side view of the structure of the present invention; Figure 4 For the present invention Figure 3 Enlarged structural diagram of point B; Figure 5 This is a schematic cross-sectional view of the support box structure of the present invention; Figure 6 This is a schematic diagram of the connection structure between the photovoltaic panel and the driven frame of the present invention; Figure 7 For the present invention Figure 6 Enlarged structural diagram of point C; Figure 8 This is a bottom view of the connection structure of the limiting plate of the present invention; Figure 9 This is a partial longitudinal section diagram of the present invention; Figure 10 This is a partial top-section structural diagram of the present invention; Figure 11 This is a schematic diagram of the connection structure between the limiting plate and the universal wheel of the present invention.

[0016] In the diagram: 1. Equipment box; 2. Casters; 3. Support box; 4. Photovoltaic panel; 5. Rubber strip; 6. Connecting strip; 7. Cover plate; 8. Driven frame; 9. Sliding frame; 10. Connecting rod; 11. U-shaped frame; 12. Support rod; 13. Limiting plate; 14. Lead screw; 15. Servo motor; 16. Slide groove; 17. Pressure plate; 18. Hydraulic oil tank; 19. Dual-axis tilt sensor; 20. Piston tube; 21. Oil delivery pipe; 22. Solenoid valve; 23. Piston column; 24. Connecting pipe. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figures 1-11 The present invention provides the following technical solution: Example 1: To address the issue that existing photovoltaic energy storage chargers require significant height space when folded, resulting in a relatively high overall height, the following technical solution is provided: a foldable mobile photovoltaic energy storage charger, comprising an equipment box 1 and a support box 3 fixedly connected to its upper surface. A photovoltaic panel 4 is disposed above the support box 3. All photovoltaic panels 4 are connected by a folding mechanism, which includes a connecting strip 6 disposed between two adjacent photovoltaic panels 4. The two sides of the connecting strip 6 are respectively connected to the axis of the corresponding photovoltaic panel 4.

[0019] In a preferred embodiment of the invention, the folding mechanism further includes a support rod 12 axially connected to the end of the photovoltaic panel 4, and a U-shaped frame 11 is provided below each photovoltaic panel 4, with the two ends of the U-shaped frame 11 respectively movably nested in the lower ends of the corresponding two support rods 12.

[0020] In the above technical solution, the support rod 12 and the U-shaped frame 11 nested and connected to it can make the photovoltaic panel 4 more flexible to flip when it is folded, reducing the possibility of jamming.

[0021] In a preferred embodiment of the invention, a sliding frame 9 is also provided below the photovoltaic panel 4, and both ends of the sliding frame 9 are axially connected to connecting rods 10, which are axially connected to the corresponding U-shaped frame 11.

[0022] In the above technical solution, a sliding frame 9 and connecting rods 10 at both ends are provided. When the sliding frame 9 moves up or down, it can drive the corresponding U-shaped frame 11 to move closer or further away from each other. When the U-shaped frame 11 moves closer to each other, it can fold several photovoltaic panels 4. When the U-shaped frame 11 moves further away from each other, it can unfold several photovoltaic panels 4.

[0023] In a preferred embodiment of the invention, the number of structures formed by the sliding frame 9 and its two end connecting rods 10 above the support box 3 is one less than the number of photovoltaic panels 4, and the structures formed by the sliding frame 9 and its two end connecting rods 10 are spaced apart below the photovoltaic panels 4.

[0024] In the above technical solution, the structure consisting of the sliding frame 9 and the connecting rods 10 at both ends is set at intervals, which can reduce the number of sliding frames 9 and connecting rods 10 used, thereby saving costs. The specific interval is set as follows: for example, if there are 5 structures consisting of the sliding frame 9 and the connecting rods 10 at both ends, they are set below the front end of the first, third and fifth photovoltaic panels 4, and below the rear end of the second and fourth photovoltaic panels 4.

[0025] In a preferred embodiment of the invention, an n-shaped cover plate 7 is provided on the upper surface of the support box 3, and a U-shaped frame 11 slides through the space formed by the lower surface of the cover plate 7 and the upper surface of the support box 3, so as to enable the U-shaped frame 11 to slide stably.

[0026] In the above technical solution, the n-shaped cover plate 7 can prevent the U-shaped frame 11 from sliding arbitrarily, thereby ensuring that the U-shaped frames 11 can only slide stably towards or away from each other, thus ensuring the stability of the structure.

[0027] In a preferred embodiment of the invention, a torsion spring is also provided between the connecting strip 6 and the photovoltaic panel 4, so that the photovoltaic panel 4 can automatically fold in a continuous W shape after all the U-shaped frames 11 come close to each other.

[0028] In the above technical solution, a torsion spring is provided so that the photovoltaic panel 4 can automatically rotate and fold after the U-shaped frame 11 approaches each other, and the photovoltaic panel 4 forms a W shape with the ends connected when it rotates and folds.

[0029] In a preferred embodiment of the invention, a rubber strip 5 is provided on the upper surface of the photovoltaic panel 4. The rubber strip 5 is used to prevent dust and water stains from entering the photovoltaic surface of the photovoltaic panel 4 through the gap between the adjacent photovoltaic panels 4 after the adjacent photovoltaic panels 4 are folded.

[0030] In the above technical solution, the rubber strip 5 is provided so that after the photovoltaic panel 4 is fully folded, the photovoltaic surface on the photovoltaic panel 4 is isolated from the outside world by the rubber strip 5, thereby preventing dust and water stains from entering the photovoltaic surface through the gaps between the photovoltaic panels 4, thus helping to keep the photovoltaic surface clean.

[0031] according to Figures 1-4 When in use, the sliding frame 9 is moved in the vertical direction. During the movement of the sliding frame 9, the connecting rod 10 connected to its shaft will rotate. When the connecting rod 10 starts to rotate horizontally, it will cause the U-shaped frame 11 to move closer to each other; if the connecting rod 10 starts to rotate at an angle, it will cause the U-shaped frame 11 to move further apart. When the U-shaped frames 11 approach each other, they will slide stably between the cover plate 7 and the upper surface of the support box 3; At the same time, the photovoltaic panel 4 will automatically fold under the action of the connecting strip 6 and the torsion spring; After the photovoltaic panel 4 is folded, the rubber strips 5 on the photovoltaic panel 4 will come into contact with each other, thereby isolating the photovoltaic surface of the photovoltaic panel 4 from the outside world through the rubber strips 5. At this time, dust and water stains from the outside world will not be able to come into contact with the photovoltaic surface of the photovoltaic panel 4, which is beneficial to protect the photovoltaic surface. In addition, by changing the original two photovoltaic panels 4 into multiple panels, the height after folding can be greatly reduced, which in turn can greatly reduce the overall height of the photovoltaic energy storage charger, thus improving the overall stability.

[0032] Example 2: To solve the problem of the sliding frame 9 moving up and down in Example 1, the following technical solution is provided: Specifically, the support box 3 is provided with a drive mechanism for extending and folding the folding mechanism, and the drive mechanism includes a servo motor 15 installed inside the support box 3.

[0033] In a preferred embodiment of the invention, the drive mechanism further includes a limiting plate 13 that is slidably connected within the support box 3, and a lead screw 14 is threaded through the limiting plate 13. The lower end of the lead screw 14 is fixedly connected to the shaft end of the servo motor 15, and the upper end of the lead screw 14 is bearing connected to the inner top end of the support box 3.

[0034] In the above technical solution, by sliding the limiting plate 13 and the support box 3, when the lead screw 14 rotates under the drive of the servo motor 15, the limiting plate 13 can only move along the axis of the lead screw 14.

[0035] In a preferred embodiment of the invention, a driven frame 8 is provided on the upper surface of the limiting plate 13, and the driven frame 8 extends movably through to the top of the support box 3. A sliding groove 16 is provided at the upper end of the driven frame 8, and a sliding frame 9 is slidably connected in the sliding groove 16.

[0036] In the above technical solution, a driven frame 8 is provided so that when it moves up or down synchronously with the limiting plate 13, it can drive the sliding frame 9, which is slidably connected in the upper sliding groove 16, to rise or fall synchronously, thereby helping the U-shaped frames 11 on both sides of the sliding frame 9 to move closer or further away from each other.

[0037] In a preferred embodiment of the invention, the leveling mechanism further includes hydraulic oil tanks 18 installed on the bottom surface of the support box 3. Two hydraulic oil tanks 18 are symmetrically arranged about the axis of the lead screw 14, and the two hydraulic oil tanks 18 are connected by a connecting pipe 24. Piston tubes 20 are provided at each of the four corners of the lower surface of the equipment box 1, penetrating into them. A piston rod 23 is seamlessly slidably connected to the lower opening of each piston tube 20. A caster wheel 2 is installed on the end of the piston rod 23 extending out of the piston tube 20. A pressure... Plate 17, and pressure plate 17 is sealed and movable through the upper end of hydraulic oil tank 18 and fixedly connected to the lower surface of limit plate 13. Each hydraulic oil tank 18 is also connected to an oil supply pipe 21, and a solenoid valve 22 is installed on the oil supply pipe 21. There are four oil supply pipes 21, and the oil supply pipes 21 connect the hydraulic oil tank 18 and the corresponding piston pipe 20. The opening of the oil supply pipe 21 and the hydraulic oil tank 18 is set between the pressure plate 17 and the upper opening of the hydraulic oil tank 18. A microcontroller is also set in the equipment box 1. The microcontroller is connected to the dual-axis tilt sensor 19 and the solenoid valve 22.

[0038] In the above technical solution, the dual-axis tilt sensor 19 measures the direction in which the equipment box 1 is facing, and then the microcontroller opens the corresponding solenoid valve 22. When the solenoid valve 22 is opened, the limit plate 13 moves upward and drives the pressure plate 17 to move upward synchronously. This causes the hydraulic oil in the hydraulic oil tank 18 to be transported to the piston tube 20 through the oil supply pipe 21, thereby achieving the purpose of lifting the caster wheel 2 by moving the corresponding piston column 23. Through repeated measurements by the dual-axis tilt sensor 19, the equipment box 1 can be adjusted to a horizontal position after the photovoltaic panel 4 is fully unfolded, thus ensuring that the photovoltaic panel 4 is in a horizontal state.

[0039] according to Figures 5-8 When in use, the operation of the servo motor 15 enables the lead screw 14 connected to its output end to rotate. During the rotation of the lead screw 14, the limiting plate 13 connected to its thread will move in the vertical direction under the limiting of its sliding connection with the support box 3. As the limiting plate 13 moves in the vertical direction, the driven frame 8 fixedly connected to it will move synchronously. When the driven frame 8 moves, it can drive the sliding frame 9, which is slidably connected in the upper slide groove 16, to move in the vertical direction; In the above process, sliding the sliding frame 9 into the sliding groove 16 can improve its flexibility and ensure the stability of the structure when the photovoltaic panel 4 moves as a whole, thereby helping to reduce the failure rate.

[0040] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A foldable mobile photovoltaic energy storage charger, comprising an equipment box (1) and a support box (3) fixedly connected to its upper surface, characterized in that: A photovoltaic panel (4) is provided above the support box (3). All the photovoltaic panels (4) are connected by a folding mechanism. The folding mechanism includes a connecting strip (6) between two adjacent photovoltaic panels (4). The two sides of the connecting strip (6) are respectively connected to the shaft of the corresponding photovoltaic panel (4). The support box (3) is provided with a drive mechanism for extending and folding the folding mechanism. The drive mechanism includes a servo motor (15) installed inside the support box (3). A leveling mechanism is connected to the drive mechanism. The leveling mechanism includes a dual-axis tilt sensor (19) installed on the top surface inside the equipment box (1).

2. The foldable mobile photovoltaic energy storage charger according to claim 1, characterized in that: The folding mechanism also includes a support rod (12) axially connected to the end of the photovoltaic panel (4), and a U-shaped frame (11) is provided below each photovoltaic panel (4), with the two ends of the U-shaped frame (11) being movably nested in the lower ends of the corresponding two support rods (12).

3. A foldable mobile photovoltaic energy storage charger according to claim 2, characterized in that: A sliding frame (9) is also provided below the photovoltaic panel (4), and both ends of the sliding frame (9) are axially connected to connecting rods (10), which are axially connected to the corresponding U-shaped frame (11).

4. A foldable mobile photovoltaic energy storage charger according to claim 3, characterized in that: The number of the sliding frame (9) and its two end connecting rods (10) above the support box (3) is 1 less than the number of photovoltaic panels (4), and the structure formed by the sliding frame (9) and its two end connecting rods (10) is spaced apart below the photovoltaic panels (4).

5. A foldable mobile photovoltaic energy storage charger according to claim 2, characterized in that: The upper surface of the support box (3) is provided with an n-shaped cover plate (7), and the U-shaped frame (11) slides through the space formed by the lower surface of the cover plate (7) and the upper surface of the support box (3) to enable the U-shaped frame (11) to slide stably.

6. A foldable mobile photovoltaic energy storage charger according to claim 2, characterized in that: A torsion spring is also provided between the connecting strip (6) and the photovoltaic panel (4) so ​​that the photovoltaic panel (4) can automatically fold in a continuous W shape after all the U-shaped frames (11) come close to each other.

7. A foldable mobile photovoltaic energy storage charger according to claim 1, characterized in that: The upper surface of the photovoltaic panel (4) is provided with a rubber strip (5). The rubber strip (5) is used to prevent dust and water stains from entering the photovoltaic surface of the photovoltaic panel (4) through the gap between the adjacent photovoltaic panels (4) after the adjacent photovoltaic panels (4) are folded.

8. A foldable mobile photovoltaic energy storage charger according to claim 3, characterized in that: The drive mechanism also includes a limiting plate (13) that is slidably connected inside the support box (3), and a lead screw (14) is threaded through the limiting plate (13). The lower end of the lead screw (14) is fixedly connected to the shaft end of the servo motor (15), and the upper end of the lead screw (14) is connected to the inner top of the support box (3) by a bearing.

9. A foldable mobile photovoltaic energy storage charger according to claim 8, characterized in that: The upper surface of the limiting plate (13) is provided with a driven frame (8), and the driven frame (8) extends through to the top of the support box (3). The upper end of the driven frame (8) is provided with a sliding groove (16), and the sliding frame (9) is slidably connected in the sliding groove (16).

10. A foldable mobile photovoltaic energy storage charger according to claim 8, characterized in that: The leveling mechanism also includes a hydraulic oil tank (18) installed on the bottom surface of the support box (3), and two hydraulic oil tanks (18) are symmetrically arranged about the axis of the lead screw (14). The two hydraulic oil tanks (18) are connected by a connecting pipe (24). Piston tubes (20) penetrating into the four corners of the lower surface of the equipment box (1) are provided, and a piston column (23) is seamlessly slidably connected in the lower opening of each piston tube (20). A caster wheel (2) is installed on the end of the piston column (23) extending out of the piston tube (20). A pressure plate (17) is seamlessly slidably connected in each hydraulic oil tank (18), and the pressure plate (17) After the sealing activity passes through the upper end of the hydraulic oil tank (18), it is fixedly connected to the lower surface of the limiting plate (13). Each hydraulic oil tank (18) is also connected to an oil supply pipe (21), and a solenoid valve (22) is installed on the oil supply pipe (21). There are four oil supply pipes (21), and the oil supply pipes (21) connect the hydraulic oil tank (18) and the corresponding piston pipe (20). The opening of the oil supply pipe (21) and the hydraulic oil tank (18) is located between the pressure plate (17) and the upper opening of the hydraulic oil tank (18). A microcontroller is also installed in the equipment box (1). The microcontroller is connected to the dual-axis tilt sensor (19) and the solenoid valve (22).

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