Hydraulic experiment table for simulating lifting of lifting tail board

Abstract

The invention relates to a hydraulic experiment table for simulating lifting of a lifting tail board, and aims to provide a practical platform for hydraulic teaching and experimental research in related fields. The hydraulic experiment table comprises a tail plate device, a table body and a hydraulic loop. The tail plate device is composed of a tail plate, a connecting rod mechanism, a connecting rod mechanism fixing support, a portal frame and angle steel. The platform body is provided with a horizontal working platform surface, a vertical working platform surface and a hydraulic station, so that different pressure and flow output can be realized; the hydraulic loop mainly comprises a hydraulic element and a pipeline, and a sensor is installed at a key part and used for monitoring parameters of the hydraulic experiment table. The experiment table further comprises an electromagnetic valve control unit, a PLC control unit, a sensor interface and a display screen. The experiment table can simulate falling, rising and overturning of the lifting tail plate, provides visual and practical experiment demonstration for experimenters, helps students to deeply understand the principle of a hydraulic system, and improves the actual operation capability of hydraulic loop construction.

Description

Technical Field

[0001] The invention relates to a hydraulic test bench for teaching, in particular to a hydraulic test bench for simulating the lifting of a tail plate. Background Art

[0002] In hydraulic teaching, traditional teaching methods often have many limitations. On the one hand, hydraulic system is an important technology widely used in modern industry. Its principle involves many fields such as fluid mechanics and mechanical transmission. Theoretical teaching lacks intuitiveness, and it is difficult for students to truly understand the complex working principle and actual operation of hydraulic system. On the other hand, practical teaching resources are limited, and it is difficult for students to get enough practical operation opportunities. Usually, the number of hydraulic experimental equipment in schools is limited, and the functions are relatively simple, which cannot meet the needs of students for in-depth learning and exploration.

[0003] The inventors found that the lifting of the tailgate is a common hydraulic application scenario with strong representativeness and practicality. By simulating the lifting of the tailgate, students can intuitively see the specific application of the hydraulic system in actual engineering. The lifting, lowering and flipping of the tailgate involves multiple key hydraulic technical links such as the telescopic control of the hydraulic cylinder, the flow and pressure regulation of the hydraulic circuit, etc. Students can deeply understand the components of the hydraulic system by operating and observing the hydraulic test bench that simulates the lifting of the tailgate. However, there is no equipment in the prior art that simulates the lifting of the tailgate and intuitively demonstrates the hydraulic principle, especially an equipment that intuitively demonstrates the integration and collaborative working mode of the hydraulic circuit and other automation equipment. Summary of the invention

[0004] In view of the technical problems existing in the prior art, the purpose of the present invention is to provide a hydraulic test bench that simulates the lifting of a tailgate, and a device that intuitively demonstrates the integration and collaborative working mode of hydraulic circuits and other automated equipment to meet teaching needs.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A hydraulic test bench for simulating the lifting of a tailgate, comprising a platform body, a tailgate device, and a hydraulic circuit; the platform body comprises a frame, and also comprises a horizontal work surface, a vertical work surface, and a hydraulic station mounted on the frame; the hydraulic station provides a power source for the hydraulic test bench; the tailgate device comprises a tailgate, a connecting rod mechanism, a connecting rod mechanism fixing bracket, a gantry, and an angle steel; the tailgate is connected to the connecting rod mechanism fixing bracket through a connecting rod mechanism, the connecting rod mechanism fixing bracket is mounted on the gantry, the gantry is mounted on the horizontal work surface, the angle steel is connected to the gantry and the horizontal work surface, the connecting rod mechanism comprises a support arm, a lifting hydraulic cylinder, and a flipping hydraulic cylinder, the lifting hydraulic cylinder is used to control the lifting of the tailgate, and the flipping hydraulic cylinder is used to control the flipping of the tailgate; the hydraulic circuit It includes hydraulic components, an oil inlet oil circuit block, a first oil return oil circuit block, a second oil return oil circuit block, an oil inlet pipe, an oil return pipe, and a hydraulic steel pipe; the hydraulic components include two three-position four-way solenoid reversing valves, two two-position four-way solenoid reversing valves, two one-way sequence valves, and a boost valve; the oil inlet oil circuit block, the first oil return oil circuit block, and the second oil return oil circuit block are all detachably connected to the platform body, the oil inlet oil circuit block is connected to the hydraulic station through the oil inlet pipe, and the first oil return oil circuit block and the second oil return oil circuit block are connected to the hydraulic station through the oil return pipe; the hydraulic components are detachably connected to the vertical working table surface, and the hydraulic components, the oil inlet oil circuit block, the first oil return oil circuit block, and the second oil return oil circuit block are connected to control the movements of the lifting hydraulic cylinder and the flipping hydraulic cylinder through detachable hydraulic steel pipes.

[0007] As a preferred embodiment, the hydraulic station includes a drive motor, a hydraulic pump group, a relief valve, a relief valve oil block, a PSI pressure gauge and a hydraulic oil tank; the hydraulic oil tank is equipped with a filtering device.

[0008] As a preferred embodiment, the horizontal work surface and the vertical work surface are arranged perpendicular to each other, the vertical work surface is located above the rear side of the horizontal work surface, and the hydraulic station is arranged below the horizontal work surface.

[0009] As a preferred embodiment, one end of the support arm, the lifting hydraulic cylinder and the flipping hydraulic cylinder are rotatably connected to the connecting rod mechanism fixed bracket, the other end of the support arm is rotatably connected to the tail plate, and the other end of the lifting hydraulic cylinder and the flipping hydraulic cylinder are rotatably connected to the tail plate through a pin.

[0010] As a preferred embodiment, the horizontal work surface is provided with a slot for facilitating the installation of the tail plate device, the gantry and the angle steel are inserted into the slot and locked by bolts; the vertical work surface is provided with a slot for facilitating the installation of the hydraulic component.

[0011] As a preferred embodiment, the horizontal work surface and the vertical work surface are both formed by splicing a plurality of mutually parallel industrial aluminum profiles, and oil baffles are arranged around the horizontal work surface.

[0012] As a preferred embodiment, a hydraulic test bench for simulating the lifting of a tailgate also includes a displacement sensor installed at one end of the tailgate near the connecting rod mechanism for measuring the displacement change of the tailgate to determine the lifting height of the tailgate, and also includes an angle sensor installed at the end of the tailgate for measuring the flipping angle of the tailgate.

[0013] As a preference, the platform body further comprises a solenoid valve control unit, a PLC control unit, a sensor interface and a display screen which are arranged above the vertical working surface.

[0014] As a preferred embodiment, the solenoid valve control unit is provided with an indicator light, a switch knob and a solenoid valve interface. The indicator light displays the connection status of the hydraulic element. The switch knob controls the connection and disconnection of the hydraulic element. The solenoid valve interface is connected to the hydraulic element fixed on the vertical working surface of the platform body. The PLC control unit includes a PLC and run, stop and reset knobs. The PLC receives analog signals from the sensor and sends instructions to the solenoid valve control unit to control the connection status of the hydraulic element, thereby realizing the control of the movement of the tailgate of the hydraulic test bench. The run, stop and reset knobs are used to control the operating status of the PLC. The sensor interface is used to connect the displacement sensor and the angle sensor. The display screen is used to display the lifting height and flip angle of the tailgate device of the hydraulic test bench.

[0015] As a preferred embodiment, a movable and positionable Forma wheel is provided at the lower end of the frame.

[0016] The principle of the present invention is: adopting a tailgate device that simulates the real working state, designing a detachable hydraulic circuit that simulates the real working state, designing a horizontal work surface that is convenient for displaying the working state of the tailgate device, designing a vertical work surface that is convenient for displaying the working state of the hydraulic circuit, providing a power source hydraulic station that simulates the real working state, and setting a solenoid valve control unit, a PLC control unit, a sensor interface and a display screen that are easy to operate and control. The present invention can meet the teaching needs of simulating the lifting of the tailgate, solve the problem that traditional hydraulic teaching lacks intuitiveness and practicality, and provide students with a practical experimental platform, so that students can have a deeper understanding of the principles of the hydraulic system and improve the practical operation ability of hydraulic circuit construction.

[0017] The present invention has the following advantages:

[0018] 1. The hydraulic test bench for simulating the lifting of a tailgate provided by the present invention is fully functional and intelligent. The design of the tailgate device can simulate the actual working requirements of a tailgate. The arrangement of various hydraulic components and sensors in the hydraulic circuit can realize the control of the extension and retraction direction and speed of the hydraulic cylinder. The PLC control unit can realize intelligent control and information display of the tailgate movement.

[0019] 2. The hydraulic test bench for simulating the lifting of a tailgate provided by the present invention meets the teaching needs of simulating the lifting of a tailgate, provides students with a practical experimental platform, solves the problem that traditional hydraulic teaching lacks intuitiveness and practicality, allows students to have a deeper understanding of the principles of the hydraulic system, and improves the practical operation ability of hydraulic circuit construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a stereogram of a hydraulic test bench that simulates the raising and lowering of a tailgate.

[0021] Figure 2 It is a rear view of a hydraulic test bench that simulates the raising and lowering of a tailgate.

[0022] Figure 3 It is a perspective view of the tailgate device.

[0023] Figure 4 It is a three-dimensional diagram of the tailgate device and the hydraulic circuit.

[0024] Figure 5 It is a schematic diagram of the tail lift device in which the tail lift is raised.

[0025] Figure 6 Schematic diagram of the tail lift device flipping.

[0026] In the figure, 1, tail plate; 2, support arm; 3, lifting hydraulic cylinder; 4, tilting hydraulic cylinder; 5, connecting rod mechanism fixing bracket; 6, gantry; 7, angle steel; 8, horizontal work surface; 9, vertical work surface; 10, oil inlet block; 11, first oil return block; 12, second oil return block; 13, oil inlet pipe; 14, oil return pipe; 15, three-position four-way solenoid reversing valve; 16, two-position four-way solenoid reversing valve; 17, one-way sequence valve; 18, boost valve; 19 , displacement sensor; 20, angle sensor; 21, hydraulic steel pipe; 22, display screen; 23, indicator light; 24, switch knob; 25, solenoid valve interface; 26, sensor interface; 27, PLC; 28, run knob; 29, stop knob; 30, reset knob; 31, oil baffle; 32, drive motor; 33, hydraulic pump group; 34, overflow valve; 35, overflow valve oil block; 36, PSI pressure gauge; 37, hydraulic oil tank; 38, Fomar wheel. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below in conjunction with specific implementation methods.

[0028] like Figure 1-4 As shown, the present invention provides a hydraulic test platform for simulating the lifting of a tailgate, comprising: a tailgate device, a platform body, and a hydraulic circuit.

[0029] The tailboard device comprises a tailboard 1, a connecting rod mechanism, a connecting rod mechanism fixing bracket 5, a gantry 6 and an angle steel 7 for fixing. The structure composed of the tailboard 1, the connecting rod mechanism and the connecting rod mechanism fixing bracket 5 simulates a real lifting tailboard.

[0030] The maximum load-bearing weight of the tailboard 1 simulating the lifting of the tailboard is 50KG, the maximum lifting height is 400mm, and the maximum flipping angle is 90 degrees. Its shape and size design can meet the working requirements of simulating the actual lifting of the tailboard. The connecting rod mechanism includes a support arm 2, a lifting hydraulic cylinder 3, and a flipping hydraulic cylinder 4. The support arm 2 is used to connect the connecting rod mechanism fixing bracket 5 and the tailboard 1, and has sufficient strength and rigidity to withstand the force of the tailboard 1 during the lifting and flipping process; the lifting hydraulic cylinder 3 is used to realize the lifting of the tailboard 1, and its stroke and thrust parameters are designed according to the maximum load-bearing weight and lifting height requirements of the tailboard 1; the flipping hydraulic cylinder 4 is used to realize the flipping of the tailboard 1; the lifting hydraulic cylinder 3 and the flipping hydraulic cylinder 4 are connected to the tailboard 1 by pins. The connecting rod mechanism fixing bracket 5 is installed on the gantry 6 to provide stable support for the connecting rod mechanism. The gantry 6 is built with national standard 6060 industrial aluminum profiles to support and position the tailgate device. Its structural strength can withstand the load of the tailgate 1 during operation, and angle steels 7 are arranged at key positions, which are connected to the horizontal work surface 8 and the gantry 6 by bolts to ensure the stability of the tailgate device.

[0031] The platform body is provided with a horizontal working surface 8, a vertical working surface 9 and a hydraulic station.

[0032] The horizontal work surface 8 is used to fix the tailgate device, and the vertical work surface 9 is used to fix the hydraulic components required for simulating the lifting of the tailgate 1. Both are spliced ​​from national standard 6060 industrial aluminum profiles. The horizontal and vertical work surfaces are provided with slots for facilitating the installation and fixing of hydraulic components and tailgate devices, and oil baffles 31 are arranged around the horizontal work surface 8 to prevent oil splashing, facilitate the collection and guidance of oil, and protect the equipment of the hydraulic test bench. The hydraulic station is the power source of the hydraulic test bench, including a drive motor 32, a hydraulic pump group 33, a relief valve 34, a relief valve oil block 35, a PSI pressure gauge 36 and a hydraulic oil tank 37. The power of the drive motor 32 meets the operating requirements of the hydraulic system. The hydraulic pump group 33 can realize the output of hydraulic oil with different pressures and flows according to the experimental needs. The hydraulic oil tank 37 has sufficient volume to store hydraulic oil and is equipped with a filtering device. The filtering device adopts multi-stage filtering to remove impurities in the hydraulic oil.

[0033] The platform body also includes a solenoid valve control unit, a PLC control unit, a sensor interface 26, and a display screen 22; the solenoid valve control unit is provided with an indicator light 23, a switch knob 24 and a solenoid valve interface 25, the indicator light 23 displays the connection status of the hydraulic element, the switch knob 24 controls the connection and disconnection of the hydraulic element, and the solenoid valve interface 25 is connected to the hydraulic element fixed on the vertical working table 9 of the platform body; the PLC control unit includes a PLC27 and a running knob 28, a stop knob 29, and a reset knob 30, the PLC27 receives an analog signal from the sensor, and issues instructions to the solenoid valve control unit to control the connection status of the hydraulic element, thereby controlling the movement of the tail plate 1 of the hydraulic test bench; the running knob 28, the stop knob 29, and the reset knob 30 can realize the control of the running status of the PLC27; the sensor interface 26 is used to connect displacement and angle sensors; the display screen 22 is used to display information related to the lifting height and flip angle of the tail plate 1 of the hydraulic test bench.

[0034] The hydraulic circuit comprises hydraulic elements, an oil inlet block 10, a first oil return block 11, a second oil return block 12, an oil inlet pipe 13, an oil return pipe 14, and a hydraulic steel pipe 21. The hydraulic circuit simulates a real tail lift hydraulic circuit.

[0035] The hydraulic components include two three-position four-way solenoid reversing valves 15, two two-position four-way solenoid reversing valves 16, two one-way sequence valves 17, and a boost valve 18. The three-position four-way solenoid reversing valves 15 are connected to the rod chambers of the lifting hydraulic cylinder 3 and the tilting hydraulic cylinder 4 through hydraulic steel pipes 21 to control the extension and retraction direction and speed of the hydraulic cylinders. The two-position four-way solenoid reversing valves 16 are used to control the on-off of the hydraulic circuit. The one-way sequence valves 17 are connected to the rodless chambers of the lifting hydraulic cylinder 3 and the tilting hydraulic cylinder 4 through hydraulic steel pipes 21 to ensure the sequential flow of hydraulic oil in a specific direction and prevent backflow. The boost valve 18 can increase the local pressure of the test bench to meet the needs of the tail plate 1 under special working conditions. The requirements of the hydraulic circuit oil inlet oil circuit block 10 are connected to the hydraulic pump group 33 at the lower end through the oil inlet pipe 13, and the upper end is connected to the two-position four-way electromagnetic reversing valve 16 to form a complete hydraulic circuit. The upper end of the first hydraulic circuit oil return oil circuit block 11 is connected to the two-position four-way electromagnetic reversing valve 16 and the three-position four-way electromagnetic reversing valve 15 through the hydraulic steel pipe 21, and the lower end is connected to the second oil return oil circuit block 12. The upper end of the second hydraulic circuit oil return oil circuit block 12 is connected to the three-position four-way electromagnetic reversing valve 15 and the booster valve 18 through the hydraulic steel pipe 21, and the lower end is connected to the hydraulic oil tank 37 through the return oil pipe 14. The hydraulic steel pipe 21 is made of pressure-resistant pipe to meet the pressure and flow requirements of the hydraulic test bench.

[0036] The sensor includes a displacement sensor 19 and an angle sensor 20. The displacement sensor 19 is installed at one end of the tail board 1 close to the connecting rod mechanism to measure the displacement change of the tail board 1 to determine the lifting height of the tail board 1; the angle sensor 20 is installed at the end of the tail board 1 to measure the flipping angle of the tail board 1.

[0037] like Figure 5 The figure shows a schematic diagram of the tail lift device in which the tail lift is lifted. The following describes the operation flow of controlling the lifting of the tail lift 1 through the schematic diagram of the tail lift 1 lifting.

[0038] First, before operating, the hydraulic test bench should be fully inspected to confirm that the liquid level in the hydraulic oil tank 37 is within the normal range. At the same time, the drive motor 32 and the hydraulic pump group 33 should be checked to ensure that the power source equipment has no abnormal noise and vibration and operates normally to provide stable power and ensure the normal operation of the hydraulic system.

[0039] Secondly, check the solenoid valve control unit, the indicator light 23 normally displays the connection status of the hydraulic component, the switch knob 24 is in the correct position, and ensure that the solenoid valve interface 25 is firmly connected to the hydraulic component fixed on the platform. Check the PLC control unit and confirm that the PLC27 run knob 28, stop knob 29, and reset knob 30 are in the normal initial state. At the same time, turn on the display screen 22, and the screen will display relevant information such as the lifting height of the tailgate 1.

[0040] Then turn on the drive motor 32 and start the hydraulic pump group 33. At this time, the hydraulic oil is pumped out, and the hydraulic oil flows into the hydraulic circuit from the oil inlet pipe 13 through the oil inlet block 10. Observe the PSI pressure gauge 36 to ensure that the hydraulic system pressure is within the normal range. Start PLC27 through the operation knob 28 of the PLC control unit. PLC27 starts to send instructions to the solenoid valve control unit and receives signals from the sensor at the same time.

[0041] When the tailgate 1 needs to rise, the two-position four-way solenoid directional control valve 16 is in the on state, and the PLC27 sends a signal to the three-position four-way solenoid directional control valve 15 connected to the lifting hydraulic cylinder to switch the solenoid directional control valve to the on state. The hydraulic oil enters the rodless chamber of the lifting hydraulic cylinder 3, pushing the piston up, thereby driving the tailgate 1 to rise. The displacement sensor 19 measures the displacement change of the tailgate 1 in real time and transmits the signal to the PLC27, and the display screen 22 displays the lifting height information of the tailgate 1. When the tailgate 1 rises to the required height, the PLC27 controls the three-position four-way solenoid directional control valve 15 to return to the middle position according to the sensor signal, stops supplying oil to the lifting hydraulic cylinder 3, and keeps the tailgate 1 at the current height.

[0042] When the tailgate 1 needs to be lowered, the PLC 27 sends a signal to the three-position four-way electromagnetic reversing valve 15, causing the electromagnetic reversing valve to switch to the on state again, and the hydraulic oil enters the rod chamber of the lifting hydraulic cylinder 3, and the tailgate 1 slowly descends under the action of the hydraulic cylinder. In this process, the two-position four-way electromagnetic reversing valve 16 switches its on state accordingly to ensure the smooth flow of the oil return path.

[0043] Finally, after the operation is completed, the operation of PLC27 is stopped by the stop knob 29 of the PLC control unit, the drive motor 32 is turned off, and the hydraulic pump group 33 stops working.

[0044] like Figure 6 The figure shows a schematic diagram of the flipping of the tail board in the tail board device. The following describes the operation process of controlling the flipping of the tail board 1 through the schematic diagram of the lifting of the tail board 1.

[0045] First, before operation, the entire hydraulic test bench needs to be checked, just like controlling the lifting of the tailgate 1. Then start the drive motor 32, so that the hydraulic pump group 33 starts to work, and the hydraulic oil flows into the hydraulic circuit from the oil inlet pipe through the oil inlet block 10. Observe the PSI pressure gauge 36 to ensure that the hydraulic system pressure is within the appropriate range, and start the PLC 27 through the operation knob 28 of the PLC control unit. The PLC 27 starts to send instructions to the solenoid valve control unit and receives signals from the sensor at the same time.

[0046] When the tailgate 1 needs to be flipped, the two-position four-way solenoid reversing valve 16 is in the on state, and the PLC27 sends a signal to the three-position four-way solenoid reversing valve 15 connected to the flip hydraulic cylinder 4, so that the solenoid reversing valve switches to the on state, and the hydraulic oil enters the rodless chamber of the flip hydraulic cylinder 4, pushing the tailgate 1 to flip. In this process, the two-position four-way solenoid reversing valve 16 controls the on-off and flow direction of the hydraulic oil to ensure that the hydraulic oil can flow smoothly to the rodless chamber of the flip hydraulic cylinder. The angle sensor 20 measures the flipping angle of the tailgate 1 in real time and transmits the signal to the PLC27, and the display screen 22 displays the flipping angle information of the tailgate 1. When the tailgate 1 flips to an angle perpendicular to the horizontal ground, the PLC27 controls the three-position four-way solenoid reversing valve 15 to return to the middle position according to the sensor signal, stops supplying oil to the rodless chamber of the flip hydraulic cylinder 4, and keeps the tailgate 1 at the current angle.

[0047] During the operation, the operator should pay close attention to the information on the display screen 22 and the operating status of the hydraulic system to ensure that the tailgate 1 is turned over smoothly and safely.

[0048] Finally, after the operation is completed, the operation of PLC27 is stopped by the stop knob 29 of the PLC control unit, the drive motor 32 is turned off, and the hydraulic pump group 33 stops working.

[0049] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A hydraulic test bench for simulating the lifting of a tailgate, characterized in that: It includes platform body, tailboard device and hydraulic circuit; The platform body includes a frame, and also includes a horizontal work surface, a vertical work surface, and a hydraulic station installed on the frame; the hydraulic station provides a power source for the hydraulic test bench; The tailboard device includes a tailboard, a connecting rod mechanism, a connecting rod mechanism fixing bracket, a gantry, and an angle steel; the tailboard is connected to the connecting rod mechanism fixing bracket through the connecting rod mechanism, the connecting rod mechanism fixing bracket is installed on the gantry, the gantry is installed on the horizontal work surface, the angle steel is connected to the gantry and the horizontal work surface, the connecting rod mechanism includes a support arm, a lifting hydraulic cylinder, and a flipping hydraulic cylinder, the lifting hydraulic cylinder is used to control the lifting of the tailboard, and the flipping hydraulic cylinder is used to control the flipping of the tailboard; The hydraulic circuit includes hydraulic components, an oil inlet block, a first oil return block, a second oil return block, an oil inlet pipe, an oil return pipe, and a hydraulic steel pipe; the hydraulic components include two three-position four-way solenoid reversing valves, two two-position four-way solenoid reversing valves, two one-way sequence valves, and a boost valve; the oil inlet block, the first oil return block, and the second oil return block are all detachably connected to the platform body, the oil inlet block is connected to the hydraulic station through the oil inlet pipe, and the first oil return block and the second oil return block are connected to the hydraulic station through the return pipe; the hydraulic components are detachably connected to the vertical working table, and the hydraulic components, the oil inlet block, the first oil return block, and the second oil return block are connected through detachable hydraulic steel pipes to control the movements of the lifting hydraulic cylinder and the flipping hydraulic cylinder.

2. A hydraulic test bench for simulating the lifting of a tailgate according to claim 1, characterized in that: The hydraulic station includes a drive motor, a hydraulic pump unit, a relief valve, a relief valve oil block, a PSI pressure gauge and a hydraulic oil tank; the hydraulic oil tank is equipped with a filtering device.

3. A hydraulic test bench for simulating the lifting of a tailgate according to claim 1, characterized in that: The horizontal working table and the vertical working table are arranged perpendicularly to each other, the vertical working table is located above the rear side of the horizontal working table, and the hydraulic station is arranged below the horizontal working table.

4. A hydraulic test bench for simulating the lifting of a tailgate according to claim 1, characterized in that: One end of the support arm, the lifting hydraulic cylinder and the flip hydraulic cylinder are all rotatably connected to the connecting rod mechanism fixed bracket, the other end of the support arm is rotatably connected to the tail plate, and the other ends of the lifting hydraulic cylinder and the flip hydraulic cylinder are rotatably connected to the tail plate through a pin.

5. A hydraulic test bench for simulating the lifting of a tailgate according to claim 1, characterized in that: The horizontal work surface is provided with a slot for installing the tail plate device, the gantry and the angle steel are inserted into the slot and locked by bolts; the vertical work surface is provided with a slot for installing the hydraulic components.

6. A hydraulic test bench for simulating the lifting of a tailgate according to claim 5, characterized in that: The horizontal work surface and the vertical work surface are both formed by splicing a plurality of mutually parallel industrial aluminum profiles, and oil baffles are arranged around the horizontal work surface.

7. A hydraulic test bench for simulating the lifting of a tailgate according to claim 1, characterized in that: It also includes a displacement sensor installed at one end of the tail board close to the connecting rod mechanism for measuring the displacement change of the tail board to determine the lifting height of the tail board, and an angle sensor installed at the end of the tail board for measuring the flipping angle of the tail board.

8. A hydraulic test bench for simulating the lifting of a tailgate according to claim 7, characterized in that: The platform body also includes a solenoid valve control unit, a PLC control unit, a sensor interface and a display screen which are arranged above the vertical working surface.

9. A hydraulic test bench for simulating the lifting of a tailgate according to claim 8, characterized in that: The solenoid valve control unit is provided with an indicator light, a switch knob and a solenoid valve interface. The indicator light displays the connection status of the hydraulic component. The switch knob controls the connection and disconnection of the hydraulic component. The solenoid valve interface is connected to the hydraulic component fixed on the vertical working surface of the platform body; the PLC control unit includes a PLC and run, stop and reset knobs. The PLC receives analog signals from the sensor and sends instructions to the solenoid valve control unit to control the connection status of the hydraulic component, thereby realizing the control of the movement of the tail plate of the hydraulic test bench; the run, stop and reset knobs are used to control the operation status of the PLC; the sensor interface is used to connect the displacement sensor and the angle sensor; the display screen is used to display the lifting height and flip angle of the tail plate device of the hydraulic test bench.

10. A hydraulic test bench for simulating the lifting of a tailgate according to claim 1, characterized in that: A movable and positionable Foma wheel is provided at the lower end of the frame.

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