Whole vehicle environment cabin emergency trailer system and control method thereof

Abstract

The invention relates to the technical field of winch equipment, and particularly discloses a whole vehicle environmental chamber emergency trailer system and a control method thereof.The whole vehicle environmental chamber emergency trailer system comprises a base, a track, a trailer plate and a winch, a mounting groove penetrating through the two ends is formed in the base, one section of the base is located in an environmental chamber, and the other section of the base is located outside the environmental chamber; the number of the rails is two, the two rails are both installed on the bottom face of the installation groove, and the rails are arranged in the length direction of the installation groove. The trailer plate is slidably connected to the tops of the two rails and is used for placing a test vehicle; the winch is mounted at one end of the mounting groove and provided with a traction rope, and one end of the traction rope is connected to the end of the trailer plate. The environment chamber has the effect of improving the use convenience of the environment chamber.

Description

Technical Field

[0001] The invention relates to the technical field of winch equipment, and in particular to a whole vehicle environmental chamber emergency towing system and a control method thereof. Background Art

[0002] The vehicle environmental chamber is a commonly used device for vehicle performance testing. It tests the performance of the vehicle by simulating various extreme environments and extreme working conditions in the environmental chamber.

[0003] In the related art, various tests are performed by fixing the vehicle in an environmental chamber. During the test, the vehicle is prone to fire due to problems such as circuit breaking and engine overheating. Normally, when a vehicle catches fire, the fire-fighting facilities pre-installed in the environmental chamber are used to extinguish the fire by spraying water, foam, etc.

[0004] With regard to the above-mentioned related technologies, since fire extinguishing is carried out in the environmental chamber, the fire extinguishing agent will be sprayed everywhere in the environmental chamber, which will contaminate the equipment in the environmental chamber. After the fire extinguishing is completed, the environmental chamber needs to be cleaned and maintained, which makes the use of the environmental chamber more troublesome. Summary of the invention

[0005] In order to improve the convenience of using the environmental chamber, the present application provides a whole-vehicle environmental chamber emergency towing system and a control method thereof.

[0006] The present application provides a vehicle environmental chamber emergency trailer system and a control method thereof using the following technical solutions: In the first aspect, an emergency trailer system for a whole vehicle environmental chamber includes a base, a track, a trailer board and a winch, wherein a mounting groove is provided in the base, two tracks are provided, both of which are installed on the bottom surface of the mounting groove, and the tracks are arranged along the length direction of the mounting groove; the trailer board is slidably connected to the top of the two tracks, and the trailer board is used to place a test vehicle; the winch is installed at one end of the mounting groove, and the winch includes a first support plate, a mounting plate, a protective shell, a motor, a rotating shaft, a first winding roller and a second winding roller, the first support plate is connected to the bottom of the mounting groove, the mounting plate is fixedly connected to the top surface of the first support plate, and both ends of the protective shell are connected to The top surface of the mounting plate; the motor is mounted on a side surface of the protective shell, the two ends of the rotating shaft are respectively rotatably connected in the protective shell, and one end of the rotating shaft is connected to the output shaft of the motor; the first winding roller and the second winding roller are connected to the rotating shaft; a first traction rope is wound on the first winding roller, and one end of the first traction rope is connected to the end of the trailer board; the bottom surface of the mounting groove away from one end of the winch is connected to the first rotating shaft through a support plate, the circumferential surface of the first rotating shaft is rotatably connected to the first guide wheel, and the second winding roller is wound with a second traction rope, and one end of the second traction rope passes through the bottom surface of the trailer board and is wound around the top of the first guide wheel and connected to the end of the trailer board.

[0007] Optionally, the track includes a third support plate and a linear guide, the third support plate is installed on the bottom surface of the installation groove, and the linear guide is installed on the top surface of the third support plate; both side surfaces of the trailer plate are provided with connecting plates, the connecting plates are connected to the top surface of the slider of the linear guide, and the end of the connecting plate close to the winch extends out of the trailer plate; a brake mechanism for stopping the moving trailer plate is installed at the end of the connecting plate close to the winch; a fourth support plate is connected to the top surface of the end of the connecting plate close to the winch, and two brake mechanisms are provided, and the two brake mechanisms are respectively installed on the two fourth support plates; the brake mechanism includes A first rotating rod, a second rotating rod, a first curved plate, a second curved plate and a driving assembly; the first rotating rod and the second rotating rod are both rotatably connected to the side of the fourth support plate; one end of the first curved plate is connected to the end of the first rotating rod, and the other end of the first curved plate faces the side of the third support plate and the end is connected to a brake pad; one end of the second curved plate is connected to the end of the second rotating rod, and the other end of the second curved plate faces the other side of the third support plate and the end is connected to a brake pad; the driving assembly is installed on the connecting plate, and the driving assembly is used to drive the first rotating rod and the second rotating rod to rotate simultaneously and in opposite directions.

[0008] Optionally, the driving assembly includes a fifth support plate, a first gear, a second gear, a double-sided spur rack and a push plate; one end of the fifth support plate is connected to the side of the fourth support plate, the other end of the fifth support plate extends to the middle position of the trailer plate, and the push plate is slidably connected to the top surface of the fifth support plate; the first gear is coaxially connected to the circumference of the first rotating rod, the second gear is coaxially connected to the circumference of the second rotating rod, the end of the double-sided spur rack is connected to the end of the push plate, and the double-sided spur rack is meshed with the first gear and the second gear; a pushing mechanism for pushing the push plate is installed at the end of the trailer plate close to the winch.

[0009] Optionally, the trailer plate is connected to a push-pull plate on the bottom surface near the end of the winch, and the push-pull plate is connected to a sixth support plate on the side surface near the bottom end of the winch; the pushing mechanism includes a third rotating shaft, a rotating plate, a pushing plate and a rotating assembly, the third rotating shaft is rotatably connected to the end of the sixth support plate, both ends of the third rotating shaft extend out of the two side surfaces of the sixth support plate, one end of the rotating plate is fixedly connected to one end of the third rotating shaft, the bottom surface of the pushing plate is connected to the top of the rotating plate, the two side surfaces of the pushing plate are sloped, and the two push plates are respectively facing the two side surfaces of the pushing plate; the rotating assembly is installed at the end of the third rotating shaft, and the rotating assembly is used to drive the third rotating shaft to rotate.

[0010] Optionally, the push plate is threadedly connected to a first screw at the end face close to the push plate, a mounting seat is installed at the end of the first screw, the mounting seat is rotatably connected to an end face away from the first screw, the ball is attached to the side face of the push plate, and the first screw is sleeved with a hexagonal nut, which is connected to the end face of the mounting seat away from the ball.

[0011] Optionally, the rotating assembly includes a rotating plate, a fourth rotating shaft, a fifth rotating shaft, a third guide wheel, a fourth guide wheel and a tension spring; one end of the rotating plate is connected to an end of the third rotating shaft away from the rotating plate, the fourth rotating shaft and the fifth rotating shaft are connected between the rotating plate and the rotating plate, and the fourth rotating shaft is located above the fifth rotating shaft; the third guide wheel is rotatably connected to the circumferential surface of the fourth rotating shaft, and the fourth guide wheel is rotatably connected to the circumferential surface of the fifth rotating shaft; one end of the tension spring is connected to the end surface of the trailer plate close to the winch, and the other end of the tension spring is connected to the top of the rotating plate; the first traction rope is wound around the third guide wheel, then wound out from under the third guide wheel, then wound around from above the fourth guide wheel, and finally wound out from under the fourth guide wheel and connected to the side of the push-pull plate.

[0012] Optionally, the top surface of the fifth support plate is connected to a baffle, one end of the baffle is bent to the top surface of the push plate, the top surface of the push plate is connected to a positioning block, the positioning block is located on the side of the baffle away from the double-sided spur rack, the side of the positioning block close to the baffle is connected to a guide rod, the end of the guide rod passes through the baffle and is connected to a limiting block, a first spring is sleeved on the guide rod, one end of the first spring is pressed against the baffle, and the other end of the first spring is pressed against the positioning block.

[0013] Optionally, a reinforcing rod is connected between the rotating plate and the rotating plate, the reinforcing rod is located below the fifth rotating shaft, a bolt is passed through the reinforcing rod, and a positioning hole for the end of the bolt to enter is provided on the circumference of the sixth support plate; a hexagonal groove is provided on the side of the rotating plate away from the rotating plate.

[0014] The top surface of the end of the movable plate away from the sliding plate is connected with a pressure plate, and the side of the movable plate away from the sliding plate is connected with a pressure plate. The side of the movable plate away from the sliding plate is connected with a pressure plate. The side of the support seat close to the pressure plate is connected with a sliding rod, and the circumference of the sliding rod is provided with a second spring, one end of the second spring is pressed against the side of the support seat, and the other end of the second spring is pressed against the side of the pressure plate; two hydraulic cylinders are installed on the top surface of the trailer plate, and the ends of the piston rods of the two hydraulic cylinders are connected to a support frame, and two support rods are connected to both ends of the support frame, and the two support rods at each end are used to clamp the tires of the test vehicle.

[0015] In a second aspect, a vehicle environmental chamber emergency trailer control method comprises the following steps: S1. When the tester observes smoke or fire, he turns on the fire extinguishing power of the terminal; S2. The terminal first controls the piston rod of the hydraulic cylinder to extend, and lifts the test vehicle through the support frame to separate the test tire from the base; S3. After the test vehicle is lifted up, the terminal starts the motor, the motor drives the rotating shaft to rotate, the rotating shaft drives the first winding roller and the second winding roller to rotate, the first winding roller winds the first traction rope, the second winding roller releases the second traction rope, and the first traction rope pulls the trailer board to move outside the environmental chamber; S4. When the test vehicle moves outside the environmental chamber, the motor stops driving the rotating shaft to rotate, and the brake mechanism brakes the trailer board; S5. Turn off the fire extinguishing power supply, release the pressure in the hydraulic cylinder, retract the piston rod into the hydraulic cylinder, and the support frame drives the test vehicle to descend; S6. After the fire is extinguished, the scrapped vehicle is towed away and the vehicle to be tested is replaced; S7. Turn the reinforcing rod to insert the bolt into the positioning hole; S8. Start the working power of the terminal, and the hydraulic cylinder drives the support frame to lift the test vehicle; S9. The motor drives the rotating shaft to rotate, and the rotating shaft drives the first winding roller and the second winding roller to rotate together, the second winding roller winds the second traction rope, the first winding roller releases the first traction rope, and the second traction rope pulls the trailer board into the environmental chamber; S10. When the test vehicle moves into the environmental chamber, the motor stops driving the rotating shaft to rotate, the bolt is unscrewed from the positioning hole, and the brake mechanism brakes the trailer board; S11. Turn off the working power, release the pressure in the hydraulic cylinder, retract the piston rod into the hydraulic cylinder, and the support frame drives the test vehicle to descend.

[0016] In summary, the present application includes at least one of the following beneficial technical effects: 1. When a vehicle catches fire, start the winch, wind up the traction rope, drive the trailer board, and drive the test vehicle out of the environmental chamber. Drag the burning test vehicle out of the environmental chamber, and then put out the fire. This can reduce the contamination of the equipment in the environmental chamber by the fire extinguishing agent, avoid the cleaning and maintenance of the equipment, and thus improve the convenience of using the environmental chamber; 2. When the first traction rope or the second traction rope stops the trailer board from moving, the motor stops driving the rotating shaft to rotate. Due to the inertia of the trailer board and the test vehicle, the trailer board continues to move forward. At this time, the trailer board will continue to rotate by pulling the first winding roller and the second winding roller through the first traction rope or the second traction rope. The first winding roller and the second winding roller will drive the rotating shaft to rotate, and the motor will self-lock. The rotation of the rotating shaft will damage the self-locking structure inside the motor; at the same time, the first traction rope and the second traction rope will pull the winch, causing the winch to loosen in the installation slot; in order to avoid the above situation, when the trailer board needs to stop sliding, the brake mechanism will stop the trailer board; 3. When it is necessary to release the squeezing of the push plate on the ball, the first winding roller reels the first traction rope, the first traction rope drives the third guide wheel and the fourth guide wheel to rotate, and the first traction rope is gradually tightened. Since the push plate is squeezing the ball at this time, the brake pad is also squeezed on the side of the third support plate. At this time, the first traction rope cannot pull the trailer plate. The first traction rope pulls the third guide wheel, and the third guide wheel pulls the rotating plate and the rotating plate to rotate toward the winch through the fourth rotating shaft. The rotating plate and the rotating plate rotate around the axis of the third rotating shaft, and the rotating plate drives the push plate to rotate toward the winch. The rotating plate stretches the tension spring, and the push plate gradually moves away The pushing plate releases the squeezing of the balls between the two balls, and the squeezing of the brake pads on the third support plate is released at this time, and the first traction rope can pull the trailer plate; when the first traction rope stops pulling the trailer plate, the trailer plate will still move forward under the action of inertia, and the first traction rope is in a relaxed state at this time. Under the action of the tension spring, the tension spring pulls the rotating plate closer to the trailer plate, and the rotating plate drives the rotating plate closer to the trailer plate through the fourth rotating shaft and the fifth rotating shaft, so that the two side surfaces of the pushing plate gradually squeeze the balls on both sides, so that the brake pads are pressed tightly against the side surfaces of the third support plate, and the trailer plate is braked. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of a trailer system according to an embodiment of the present application; Figure 2 It is a partial structural schematic diagram of the trailer system according to an embodiment of the present application; Figure 3 yes Figure 2 A schematic diagram of the enlarged structure of part A; Figure 4 is a schematic diagram of the cross-sectional structure of the support seat of the embodiment of the present application; Figure 5 yes Figure 2 A schematic diagram of the enlarged structure of part B; Figure 6 yes Figure 2 A schematic diagram of the enlarged structure of the middle C part; Figure 7 yes Figure 2 A schematic diagram of the enlarged structure of the D part; Figure 8 It is a schematic diagram of the cross-sectional structure of the base of the embodiment of the present application.

[0018] Description of reference numerals: 1. Base; 11. Mounting groove; 12. Support plate; 121. First rotating shaft; 122. First guide wheel; 123. Slide plate; 124. Moving plate; 125. Pressing plate; 13. Support seat; 131. U-shaped slide groove; 132. Slide bar; 133. Second spring; 2. Track; 21. Third support plate; 22. Linear guide rail; 3. Trailer plate; 31. Connecting plate; 311. Fourth support plate; 32. Push-pull plate; 33 , sixth support plate; 331, positioning hole; 4, winch; 41, first support plate; 42, mounting plate; 421, second support plate; 422, second rotating shaft; 423, second guide wheel; 43, protective shell; 44, motor; 45, rotating shaft; 451, partition plate; 46, first winding roller; 461, first traction rope; 47, second winding roller; 471, second traction rope; 5, brake mechanism; 51, first rotating shaft rod; 52, second rotating rod; 53, first arc plate; 54, second arc plate; 55, driving assembly; 551, fifth supporting plate; 552, first gear; 553, second gear; 554, double-sided spur rack; 555, push plate; 556, first screw rod; 557, mounting seat; 558, ball; 559, hexagonal nut; 56, brake pad; 6, pushing mechanism; 61, third rotating shaft; 62, rotating plate; 6 3. Push plate; 64. Rotating assembly; 641. Rotating plate; 6411. Hexagonal groove; 642. Fourth rotating shaft; 643. Fifth rotating shaft; 644. Third guide wheel; 645. Fourth guide wheel; 646. Tension spring; 647. Reinforcing rod; 648. Bolt; 71. Baffle; 72. Positioning block; 73. Guide rod; 731. Limiting block; 74. First spring; 8. Hydraulic cylinder; 81. Support frame; 811. Support rod. DETAILED DESCRIPTION

[0019] The following is combined with Figure 1-8 This application is described in further detail.

[0020] The present application embodiment discloses a vehicle environmental chamber emergency trailer system and a control method thereof. Figure 1-8 The trailer system includes a base 1, a track 2, a trailer board 3 and a winch 4. The base 1 is provided with a mounting groove 11 running through both ends. One section of the base 1 is located in the environmental chamber, and the other section of the base 1 is located outside the environmental chamber. Two tracks 2 are provided, and both tracks 2 are installed on the bottom surface of the mounting groove 11. The tracks 2 are arranged along the length direction of the mounting groove 11. The trailer board 3 is slidably connected to the top of the two tracks 2, and the trailer board 3 is used to place the test vehicle. The winch 4 is installed at one end of the mounting groove 11, and the winch 4 has a traction rope, and one end of the traction rope is connected to the end of the trailer board 3.

[0021] When a fire occurs in the vehicle, the winch 4 is started, the winch 4 reels in the traction rope, the traction rope drives the trailer board 3, and the trailer board 3 drives the test vehicle to move out of the environmental chamber, and the burning test vehicle is towed out of the environmental chamber, and then the burning vehicle is extinguished, which can reduce the contamination of the fire extinguishing agent to the equipment in the environmental chamber, avoid the cleaning and maintenance of the equipment, and thus improve the convenience of using the environmental chamber.

[0022] The winch 4 includes a first support plate 41, a mounting plate 42, a protective shell 43, a motor 44, a rotating shaft 45, a first winding roller 46 and a second winding roller 47. Two first support plates 41 are provided, and the two first support plates 41 are connected to the bottom of the mounting groove 11. The mounting plate 42 is fixedly connected to the top surface of the first support plate 41. The protective shell 43 is a U-shaped plate, and both ends of the protective shell 43 are connected to the top surface of the mounting plate 42; the motor 44 is installed on a side of the protective shell 43, and both ends of the rotating shaft 45 are rotatably connected to the two sides of the protective shell 43 respectively, and one end of the rotating shaft 45 is coaxially connected to the output shaft of the motor 44; the first winding roller 46 and the second winding roller 47 are coaxially connected to the rotating shaft 45, the first winding roller 46 and the second winding roller 47 are located in the protective shell 43, and the circumferential surface of the rotating shaft 45 is connected to three partition plates 45 1, one of the partition plates 451 is connected between the first winding roller 46 and the second winding roller 47, the other partition plate 451 is connected to the end of the first winding roller 46 away from the second winding tube, and the remaining partition plate 451 is connected to the end of the second winding roller 47 away from the first winding roller 46; a first traction rope 461 is wound on the first winding roller 46, and one end of the first traction rope 461 is connected to the end of the trailer board 3; the bottom surface of the end of the mounting groove 11 away from the winch 4 is connected to the first rotating shaft 121 through the support plate 12, the first rotating shaft 121 is rotatably connected to the first guide wheel 122, and a second traction rope 471 is wound on the second winding roller 47, one end of the second traction rope 471 passes through the bottom surface of the trailer board 3 and is wound on the first guide wheel 122 from above and connected to the end of the trailer board 3.

[0023] The first guide wheel 122 slides on the first rotating shaft 121, and two second support plates 421 are connected to the bottom surface of the mounting plate 42. One end of the two second support plates 421 away from the trailer plate 3 extends out of the mounting plate 42, and a second rotating shaft 422 is connected between the ends of the two second support plates 421. A second guide wheel 423 is rotated on the outer circumference of the second rotating shaft 422, and the second guide wheel 423 slides on the circumference of the second rotating shaft 422. The second traction rope 471 goes in from the top of the second guide wheel 423 and comes out from the bottom of the second guide wheel 423, and the protruding part of the second traction rope 471 is located below the mounting plate 42.

[0024] When the trailer board 3 needs to be pulled out of the environmental cabin, the motor 44 drives the rotating shaft 45 to rotate, and the rotating shaft 45 drives the first winding roller 46 and the second winding roller 47 to rotate at the same time, the first winding roller 46 drives the first traction rope 461 to reel in, the first traction rope 461 drives the trailer board 3 to move out of the environmental cabin, and the second winding roller 47 releases the second traction rope 471. As the trailer board 3 moves out of the environmental cabin, the trailer board 3 pulls the second traction rope 471, and the released second traction rope 471 on the second winding roller 47 is pulled into the environmental cabin through the first guide wheel 122; when the trailer board 3 needs to be pulled into the environmental cabin, the motor 44 drives the rotating shaft 45 to rotate, and the rotating shaft 45 drives the first winding roller 46 and the second winding roller 47 to rotate at the same time, and the first winding roller 46 drives the first traction rope 461 to reel in, and the first traction rope 461 drives the trailer board 3 to move out of the environmental cabin, and the second winding roller 47 releases the second traction rope 471. The machine 44 drives the rotating shaft 45 to rotate in the opposite direction, and the rotating shaft 45 drives the first winding roller 46 and the second winding roller 47 to rotate in the opposite direction. The second winding roller 47 winds the second traction rope 471, and the second traction rope 471 drives the first guide wheel 122 and the second guide wheel 423 to rotate, and the second traction rope 471 drives the trailer board 3 to move into the environmental chamber; in order to evenly wind the second traction rope 471 around the circumference of the second winding roller 47, when the second winding roller 47 winds the traction rope, the second traction rope 471 drives the first guide wheel 122 to slide on the circumference of the first rotating shaft 121, and drives the second guide wheel 423 to slide on the circumference of the second rotating shaft 422.

[0025] The track 2 includes a third support plate 21 and a linear guide 22. The third support plate 21 is installed on the bottom surface of the mounting groove 11 and is arranged along the length direction of the mounting groove 11. The linear guide 22 is installed on the top surface of the third support plate 21. Both sides of the trailer board 3 have connecting plates 31. The connecting plates 31 are connected to the top surface of the slider of the linear guide 22. The end of the connecting plate 31 close to the winch 4 extends out of the trailer board 3. The end of the connecting plate 31 close to the winch 4 is installed with a brake mechanism 5 for stopping the moving trailer board 3.

[0026] When the first traction rope 461 or the second traction rope 471 stops the trailer board 3, the motor 44 stops driving the rotating shaft 45 to rotate. Due to the inertia of the trailer board 3 and the test vehicle, the trailer board 3 continues to move forward. At this time, the trailer board 3 will continue to rotate by pulling the first winding roller 46 and the second winding roller 47 through the first traction rope 461 or the second traction rope 471. The first winding roller 46 and the second winding roller 47 will drive the rotating shaft 45 to rotate, and the motor 44 will self-lock. The rotation of the rotating shaft 45 will damage the internal self-locking structure of the motor 44; at the same time, the first traction rope 461 and the second traction rope 471 pull the winch 4, which will cause the winch 4 to loosen in the installation groove 11; in order to avoid the above situation, when the trailer board 3 needs to stop sliding, the brake mechanism 5 will stop the trailer board 3.

[0027] The top surface of the end of the connecting plate 31 close to the winch 4 is connected to a fourth support plate 311, and two brake mechanisms 5 are provided, and the two brake mechanisms 5 are respectively installed on the two fourth support plates 311; the brake mechanism 5 includes a first rotating rod 51, a second rotating rod 52, a first curved plate 53, a second curved plate 54 and a driving assembly 55; the first rotating rod 51 and the second rotating rod 52 are both rotatably connected to the side of the fourth support plate 311 close to the winch 4, and the first rotating rod 51 is located above the second rotating rod 52; one end of the first curved plate 53 is connected to the end of the first rotating rod 51, and the other end of the first curved plate 53 faces the side of the third support plate 21 and the end is connected with a brake pad 56; one end of the second curved plate 54 is connected to the end of the second rotating rod 52, and the other end of the second curved plate 54 faces the other side of the third support plate 21 and the end is connected with a brake pad 56; the driving assembly 55 is installed on the connecting plate 31, and the driving assembly 55 is used to drive the first rotating rod 51 and the second rotating rod 52 to rotate simultaneously and in opposite directions.

[0028] When the trailer board 3 needs to be braked, the driving assembly 55 drives the first rotating rod 51 and the second rotating rod 52 to rotate. The first rotating rod 51 drives the first arc plate 53 to approach the third support plate 21, and the second rotating rod 52 drives the second arc plate 54 to approach the third support plate 21, so that the two brake pads 56 are respectively pressed against the two side surfaces of the third support plate 21, and under the action of friction, the trailer board 3 is restricted from continuing to move forward.

[0029] The driving assembly 55 includes a fifth support plate 551, a first gear 552, a second gear 553, a double-sided spur rack 554 and a push plate 555; one end of the fifth support plate 551 is connected to the side of the fourth support plate 311, and the other end of the fifth support plate 551 extends to the middle position of the trailer plate 3, and the push plate 555 is slidably connected to the top surface of the fifth support plate 551 through a T-block; the first gear 552 is coaxially connected to the circumference of the first rotating rod 51, the second gear 553 is coaxially connected to the circumference of the second rotating rod 52, the end of the double-sided spur rack 554 is connected to the end of the push plate 555, and the double-sided spur rack 554 is meshed with the first gear 552 and the second gear 553; a pushing mechanism 6 for pushing the push plate 555 is installed at the end of the trailer plate 3 close to the winch 4.

[0030] When it is necessary to drive the first rotating rod 51 and the second rotating rod 52 to rotate, the pushing mechanism 6 pushes the push plate 555, and the push plate 555 slides on the top surface of the fifth support plate 551 through the T-block. The push plate 555 drives the double-sided spur rack 554 to move, and the double-sided spur rack 554 drives the first gear 552 and the second gear 553 to rotate. The first gear 552 can drive the first rotating rod 51 to rotate, and the second gear 553 can drive the second rotating rod 52 to rotate.

[0031] The bottom surface of the trailer plate 3 near the end of the winch 4 is connected to a push-pull plate 32, and the side surface of the push-pull plate 32 near the bottom of the winch 4 is connected to the sixth support plate 33; the pushing mechanism 6 includes a third rotating shaft 61, a rotating plate 62, a pushing plate 63 and a rotating assembly 64, the third rotating shaft 61 is rotatably connected to the end of the sixth support plate 33, the two ends of the third rotating shaft 61 extend out of the two side surfaces of the sixth support plate 33, one end of the rotating plate 62 is fixedly connected to one end of the third rotating shaft 61, the bottom surface of the pushing plate 63 is connected to the top of the rotating plate 62, the two side surfaces of the pushing plate 63 are sloped, and the two pushing plates 555 The push plate 555 is respectively facing the two side surfaces of the push plate 63, and the end surface of the push plate 555 close to the push plate 63 is threadedly connected with the first screw 556, and a mounting seat 557 is installed at the end of the first screw 556, and the end of the mounting seat 557 away from the first screw 556 is rotatably connected with a ball 558, and the ball 558 is attached to the side surface of the push plate 63, and the first screw 556 is sleeved with a hexagonal nut 559, and the hexagonal nut 559 is connected to the end surface of the mounting seat 557 away from the ball 558; the rotating component 64 is installed at the end of the third rotating shaft 61, and the rotating component 64 is used to drive the third rotating shaft 61 to rotate.

[0032] When it is necessary to drive the push plate 555 to move, the rotating component 64 drives the third rotating shaft 61 to rotate, the third rotating shaft 61 drives the rotating plate 62 to rotate, the rotating plate 62 drives the push plate 63 to rotate around the third rotating shaft 61, the two side surfaces of the push plate 63 contact the balls 558 on both sides, the push plate 63 squeezes the balls 558 through the slope, the balls 558 push the mounting seat 557, the mounting seat 557 pushes the first screw 556, and the first screw 556 can push the push plate 555.

[0033] The rotating assembly 64 includes a rotating plate 641, a fourth rotating shaft 642, a fifth rotating shaft 643, a third guide wheel 644, a fourth guide wheel 645 and a tension spring 646; one end of the rotating plate 641 is connected to the end of the third rotating shaft 61 away from the rotating plate 62, the fourth rotating shaft 642 and the fifth rotating shaft 643 are connected between the rotating plate 641 and the rotating plate 62, and the fourth rotating shaft 642 is located above the fifth rotating shaft 643; the third guide wheel 644 is rotatably connected to the circumference of the fourth rotating shaft 642, and the third guide wheel 644 slides on the fourth rotating shaft The fourth guide wheel 645 is rotatably connected to the circumference of the fifth rotating shaft 643, and the fourth guide wheel 645 slides on the circumference of the fifth rotating shaft 643; one end of the tension spring 646 is connected to the end face of the trailer plate 3 close to the winch 4, and the other end of the tension spring 646 is connected to the top of the rotating plate 641; the first traction rope 461 is wound around the third guide wheel 644, and then wound out from the bottom of the third guide wheel 644, and then wound in from the top of the fourth guide wheel 645, and finally wound out from the bottom of the fourth guide wheel 645 and connected to the side of the push-pull plate 32.

[0034] When it is necessary to release the squeezing of the push plate 63 on the ball 558, the first winding roller 46 reels up the first traction rope 461, and the first traction rope 461 drives the third guide wheel 644 and the fourth guide wheel 645 to rotate, and the first traction rope 461 is gradually tightened. Since the push plate 63 is squeezing the ball 558 at this time, the brake pad is also squeezed on the side of the third support plate 21. At this time, the first traction rope 461 cannot pull the trailer plate 3, and the first traction rope 461 pulls the third guide wheel 644, and the third guide wheel 644 pulls the rotating plate 62 and the rotating plate 641 to rotate toward the winch 4 through the fourth rotating shaft 642. The rotating plate 62 and the rotating plate 641 rotate around the axis of the third rotating shaft 61, and the rotating plate 62 drives the push plate 63 to rotate toward the winch 4, and the rotating plate 641 stretches the tension spring 646. The pushing plate 63 gradually moves away from between the two ball bearings 558, releasing the squeezing of the pushing plate 63 on the ball bearings 558. At this time, the squeezing of the brake pad 56 on the third supporting plate 21 is released, and the first traction rope 461 can pull the trailer board 3; when the first traction rope 461 stops pulling the trailer board 3, the trailer board 3 will still move forward under the action of inertia. At this time, the first traction rope 461 is in a relaxed state. Under the action of the tension spring 646, the tension spring 646 pulls the rotating plate 641 to approach the trailer board 3. The rotating plate 641 drives the rotating plate 62 to approach the trailer board 3 through the fourth rotating shaft 642 and the fifth rotating shaft 643, so that the two side surfaces of the pushing plate 63 gradually squeeze the ball bearings 558 on both sides, so that the brake pads are pressed tightly against the side surfaces of the third supporting plate 21, and the trailer board 3 is braked.

[0035] The top surface of the fifth support plate 551 is connected to a baffle plate 71, one end of the baffle plate 71 is bent to the top surface of the push plate 555, the top surface of the push plate 555 is connected to a positioning block 72, the positioning block 72 is located on the side of the baffle plate 71 away from the double-sided spur rack 554, the side of the positioning block 72 close to the baffle plate 71 is connected to a guide rod 73, the end of the guide rod 73 passes through the baffle plate 71 and is connected to a limiting block 731, a first spring 74 is sleeved on the guide rod 73, one end of the first spring 74 is pressed against the baffle plate 71, and the other end of the first spring 74 is pressed against the positioning block 72.

[0036] When the push plate 63 squeezes the ball 558, the push plate 555 drives the positioning block 72 to move toward the baffle 71, and the positioning block 72 compresses the first spring 74; when the squeezing of the push plate 63 on the ball 558 is released, the first spring 74 pushes the positioning block 72, and the positioning block 72 drives the push plate 555 to slide toward the push plate 63 until the limit block 731 is close to the side of the baffle 71, and the push plate 555 drives the double-sided spur rack 554, and the double-sided spur rack 554 drives the first gear 552 and the second gear 553 to rotate, so that the first arc plate 53 and the second arc plate 54 drive the brake pad 56 to move away from the side of the third support plate 21.

[0037] A reinforcing rod 647 is connected between the rotating plate 62 and the rotating plate 641. The reinforcing rod 647 is located below the fifth rotating shaft 643. A bolt 648 is inserted into the reinforcing rod 647. A positioning hole 331 for the end of the bolt 648 to enter is provided on the circumference of the sixth supporting plate 33. A hexagonal groove 6411 is provided on the side of the rotating plate 641 away from the rotating plate 62. The hexagonal groove 6411 is coaxial with the third rotating shaft 61. When the trailer plate 3 needs to be moved into the environmental chamber, a hexagonal wrench is inserted into the hexagonal groove 6411, and the hexagonal wrench is rotated to drive the rotating plate 64 1 rotates together, the rotating plate 641 drives the reinforcing rod 647 to rotate around the third rotating shaft 61, so that the end of the bolt 648 is aligned with the positioning hole 331, and then the bolt 648 is rotated to insert the end of the bolt 648 into the positioning hole 331. At this time, the reinforcing rod 647 is fixed, and at the same time, it also contacts the squeezing of the third supporting plate 21 by the brake pad 56, so that the trailer plate 3 can be driven to move into the environmental chamber; when the trailer plate 3 moves to the target position, the end of the bolt 648 is screwed out from the positioning hole 331, and the hexagonal wrench is loosened to return the rotating plate 641 to its original position.

[0038] A support seat 13 is connected to the bottom of the mounting groove 11, and the support seat 13 is located at the end of the base 1 away from the winch 4. The bottom end of the support plate 12 is inserted into the support seat 13, and a slide plate 123 is connected between the bottom ends of the two support plates 12. A U-shaped slide groove 131 is provided in the support seat 13 for the support plate 12 and the slide plate 123 to slide. A moving plate 124 is connected to the side of the slide plate 123 away from the winch 4, and the end of the moving plate 124 away from the slide plate 123 extends out of the support seat 13, and a clamping plate 125 is connected to the top surface of the end of the moving plate 124 away from the slide plate 123. A sliding rod 132 is connected to the side of the support seat 13 close to the clamping plate 125, and a second spring 133 is sleeved on the circumference of the sliding rod 132. One end of the second spring 133 is pressed against the side of the support seat 13, and the other end of the second spring 133 is pressed against the side of the clamping plate 125.

[0039] Before the first traction rope 461 pulls the trailer board 3 to move, the first winding roller 46 winds up part of the first traction rope 461, and the second winding roller 47 releases part of the second traction rope 471. Since the moving plate 124 does not move, the second traction rope 471 is in a relaxed state. At this time, the second spring 133 pushes the clamping plate 125 away from the winch 4, the clamping plate 125 drives the moving plate 124, the moving plate 124 drives the slide plate 123, the slide plate 123 drives the support plate 12, and the support plate 12 drives the first rotating shaft 121 The first rotating shaft 121 drives the first guide wheel 122 away from the winch 4, and the second traction rope 471 is tightened through the first guide wheel 122; when the second winding roller 47 winds up the second traction rope 471, the second traction rope 471 pulls the first rotating shaft 121, the support plate 12, the slide plate 123, the moving plate 124 and the clamping plate 125 through the first guide wheel 122, and the clamping plate 125 compresses the second spring 133 until the slide plate 123 contacts the end of the U-shaped slide groove 131, and the trailer board 3 can be pulled at this time.

[0040] Two hydraulic cylinders 8 are installed on the top surface of the trailer board 3. The ends of the piston rods of the two hydraulic cylinders 8 are connected to a support frame 81. Both ends of the support frame 81 are connected to two support rods 811. The two support rods 811 at each end are used to clamp the tires of the test vehicle.

[0041] When a fire occurs, the hydraulic cylinder 8 is started, and the hydraulic cylinder 8 lifts the support frame 81, and the support frame 81 drives the support rod 811 to rise, and the support rod 811 pushes the four tires of the test vehicle upward, so that the entire test vehicle can be lifted up. At this time, the trailer board 3 can be dragged to move the vehicle away from the environmental chamber.

[0042] The vehicle environmental chamber emergency trailer control method comprises the following steps: S1. When the tester observes smoke or fire, he turns on the fire extinguishing power of the terminal; S2. The terminal first controls the piston rod of the hydraulic cylinder 8 to extend, and lifts the test vehicle through the support frame 81 to separate the test tire from the base 1; S3. After the test vehicle is lifted up, the terminal starts the motor 44, the motor 44 drives the rotating shaft 45 to rotate, the rotating shaft 45 drives the first winding roller 46 and the second winding roller 47 to rotate, the first winding roller 46 winds the first traction rope 461, the second winding roller 47 releases the second traction rope 471, and the first traction rope 461 pulls the trailer board 3 to move outside the environmental chamber; S4. When the test vehicle moves outside the environmental chamber, the motor 44 stops driving the rotating shaft 45 to rotate, and the brake mechanism 5 brakes the trailer plate 3; S5. Turn off the fire extinguishing power supply, release the pressure of the hydraulic cylinder 8, retract the piston rod into the hydraulic cylinder 8, and the support frame 81 drives the test vehicle to descend; S6. After the fire is extinguished, the scrapped vehicle is towed away and the vehicle to be tested is replaced; S7. Rotate the reinforcing rod 647 to insert the bolt 648 into the positioning hole 331; S8. Start the working power supply of the terminal, and the hydraulic cylinder 8 drives the support frame 81 to lift the test vehicle; S9. The motor 44 drives the rotating shaft 45 to rotate, and the rotating shaft 45 drives the first winding roller 46 and the second winding roller 47 to rotate together, the second winding roller 47 winds the second traction rope 471, the first winding roller 46 releases the first traction rope 461, and the second traction rope 471 pulls the trailer board 3 into the environmental chamber; S10. When the test vehicle moves into the environmental chamber, the motor 44 stops driving the rotating shaft 45 to rotate, the bolt 648 is unscrewed from the positioning hole 331, and the brake mechanism 5 brakes the trailer plate 3; S11. Turn off the working power supply, release the pressure in the hydraulic cylinder 8, retract the piston rod into the hydraulic cylinder 8, and the support frame 81 drives the test vehicle to descend.

[0043] The implementation principle of a whole-vehicle environmental chamber emergency towing system and its control method in an embodiment of the present application is as follows: when a fire occurs in a vehicle, the winch 4 is started, the winch 4 reels in the traction rope, the traction rope drives the trailer board 3, and the trailer board 3 drives the test vehicle to move out of the environmental chamber, and the burning test vehicle is towed out of the environmental chamber, and then the fire is extinguished in the burning vehicle, which can reduce the contamination of the equipment in the environmental chamber by the fire extinguishing agent, avoid the cleaning and maintenance of the equipment, and thus improve the convenience of using the environmental chamber.

[0044] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A vehicle environmental chamber emergency trailer system, characterized in that: The invention comprises a base (1), a track (2), a trailer board (3) and a winch (4); the base (1) is provided with a mounting groove (11); two tracks (2) are provided, the two tracks (2) are both installed on the bottom surface of the mounting groove (11), and the tracks (2) are arranged along the length direction of the mounting groove (11); the trailer board (3) is slidably connected to the top of the two tracks (2), and the trailer board (3) is used to place a test vehicle; the winch (4) is installed on the top of the two tracks (2). At one end of the mounting groove (11), the hoist (4) comprises a first support plate (41), a mounting plate (42), a protective shell (43), a motor (44), a rotating shaft (45), a first winding roller (46) and a second winding roller (47), the first support plate (41) being connected to the bottom of the mounting groove (11), the mounting plate (42) being fixedly connected to the top surface of the first support plate (41), and both ends of the protective shell (43) being connected to the top surface of the mounting plate (42); The motor (44) is mounted on a side surface of the protective shell (43); both ends of the rotating shaft (45) are respectively rotatably connected in the protective shell (43); one end of the rotating shaft (45) is connected to the output shaft of the motor (44); the first winding roller (46) and the second winding roller (47) are connected to the rotating shaft (45); a first traction rope (461) is wound on the first winding roller (46); one end of the first traction rope (461) is connected to the trailer board (3); the bottom surface of the mounting groove (11) away from one end of the winch (4) is connected to a first rotating shaft (121) through a support plate (12); the first rotating shaft (121) is rotatably connected to a first guide wheel (122); a second traction rope (471) is wound around the second winding roller (47); one end of the second traction rope (471) passes through the bottom surface of the trailer board (3) and is wound above the first guide wheel (122) and connected to the end of the trailer board (3).

2. The whole vehicle environmental chamber emergency towing system according to claim 1, characterized in that: The track (2) comprises a third support plate (21) and a linear guide rail (22), wherein the third support plate (21) is mounted on the bottom surface of the mounting groove (11), and the linear guide rail (22) is mounted on the top surface of the third support plate (21); both sides of the trailer plate (3) are provided with connecting plates (31), wherein the connecting plates (31) are connected to the top surface of the slider of the linear guide rail (22), and the end of the connecting plate (31) close to the hoist (4) extends out of the trailer plate (3); a brake mechanism (5) for stopping the moving trailer plate (3) is mounted on the end of the connecting plate (31) close to the hoist (4); a fourth support plate (311) is connected to the top surface of the end of the connecting plate (31) close to the hoist (4), and two brake mechanisms (5) are provided, and the two brake mechanisms (5) are respectively mounted on the two fourth support plates (311); the brake mechanism (5) comprises a first rotating A movable rod (51), a second rotating rod (52), a first curved plate (53), a second curved plate (54) and a driving assembly (55); the first rotating rod (51) and the second rotating rod (52) are both rotatably connected to the side surface of the fourth supporting plate (311); one end of the first curved plate (53) is connected to the end of the first rotating rod (51), the other end of the first curved plate (53) faces the side surface of the third supporting plate (21) and the end is connected with a brake pad (56); one end of the second curved plate (54) is connected to the end of the second rotating rod (52), the other end of the second curved plate (54) faces the other side surface of the third supporting plate (21) and the end is connected with a brake pad (56); the driving assembly (55) is installed on the connecting plate (31), and the driving assembly (55) is used to drive the first rotating rod (51) and the second rotating rod (52) to rotate simultaneously and in opposite directions.

3. The whole vehicle environmental chamber emergency towing system according to claim 2, characterized in that: The driving assembly (55) comprises a fifth support plate (551), a first gear (552), a second gear (553), a double-sided spur rack (554) and a push plate (555); one end of the fifth support plate (551) is connected to the side of the fourth support plate (311), the other end of the fifth support plate (551) extends to the middle position of the trailer plate (3), and the push plate (555) is slidably connected to the top surface of the fifth support plate (551); the first gear (552) ) is coaxially connected to the circumference of the first rotating rod (51), the second gear (553) is coaxially connected to the circumference of the second rotating rod (52), the end of the double-sided spur rack (554) is connected to the end of the push plate (555), and the double-sided spur rack (554) is meshed with the first gear (552) and the second gear (553); a pushing mechanism (6) for pushing the push plate (555) is installed at the end of the trailer plate (3) close to the winch (4).

4. The whole vehicle environmental chamber emergency towing system according to claim 3, characterized in that: The bottom surface of the trailer plate (3) near the end of the winch (4) is connected to a push-pull plate (32), and the side surface of the push-pull plate (32) near the bottom of the winch (4) is connected to a sixth support plate (33); the pushing mechanism (6) comprises a third rotating shaft (61), a rotating plate (62), a pushing plate (63) and a rotating assembly (64); the third rotating shaft (61) is rotatably connected to the end of the sixth support plate (33), and both ends of the third rotating shaft (61) extend out of the sixth support plate (33) outside the two side surfaces, one end of the rotating plate (62) is fixedly connected to one end of the third rotating shaft (61), the bottom surface of the pushing plate (63) is connected to the top of the rotating plate (62), the two side surfaces of the pushing plate (63) are sloped, and the two pushing plates (555) are respectively facing the two side surfaces of the pushing plate (63); the rotating component (64) is installed at the end of the third rotating shaft (61), and the rotating component (64) is used to drive the third rotating shaft (61) to rotate.

5. The whole vehicle environmental chamber emergency towing system according to claim 4, characterized in that: The push plate (555) is threadedly connected to a first screw rod (556) at the end face close to the push plate (63); a mounting seat (557) is installed at the end of the first screw rod (556); the mounting seat (557) is rotatably connected to an end face of the first screw rod (556) away from the first screw rod (556); the ball (558) is attached to the side face of the push plate (63); the first screw rod (556) is sleeved with a hexagonal nut (559); and the hexagonal nut (559) is connected to the end face of the mounting seat (557) away from the ball (558).

6. The whole vehicle environmental chamber emergency towing system according to claim 4, characterized in that: The rotating assembly (64) comprises a rotating plate (641), a fourth rotating shaft (642), a fifth rotating shaft (643), a third guide wheel (644), a fourth guide wheel (645) and a tension spring (646); one end of the rotating plate (641) is connected to an end of the third rotating shaft (61) away from the rotating plate (62); the fourth rotating shaft (642) and the fifth rotating shaft (643) are connected between the rotating plate (641) and the rotating plate (62); the fourth rotating shaft (642) is located above the fifth rotating shaft (643); the third guide wheel (644) is rotatably connected to the third rotating shaft (61) and the fifth rotating shaft (643); The fourth guide wheel (645) is rotatably connected to the circumference of the fifth rotating shaft (643); one end of the tension spring (646) is connected to the end surface of the trailer plate (3) close to the winch (4), and the other end of the tension spring (646) is connected to the top of the rotating plate (641); the first traction rope (461) is wound around the third guide wheel (644), then wound out from the bottom of the third guide wheel (644), then wound in from the top of the fourth guide wheel (645), and finally wound out from the bottom of the fourth guide wheel (645) and connected to the side of the push-pull plate (32).

7. The whole vehicle environmental chamber emergency towing system according to claim 3, characterized in that: The top surface of the fifth support plate (551) is connected to a baffle plate (71), one end of the baffle plate (71) is bent to the top surface of the push plate (555), the top surface of the push plate (555) is connected to a positioning block (72), the positioning block (72) is located on the side of the baffle plate (71) away from the double-sided spur rack (554), the side of the positioning block (72) close to the baffle plate (71) is connected to a guide rod (73), the end of the guide rod (73) passes through the baffle plate (71) and is connected to a limiting block (731), a first spring (74) is sleeved on the guide rod (73), one end of the first spring (74) is pressed against the baffle plate (71), and the other end of the first spring (74) is pressed against the positioning block (72).

8. The whole vehicle environmental chamber emergency towing system according to claim 6, characterized in that: A reinforcing rod (647) is connected between the rotating plate (62) and the rotating plate (641), and the reinforcing rod (647) is located below the fifth rotating shaft (643). A bolt (648) is inserted into the reinforcing rod (647), and a positioning hole (331) for the end of the bolt (648) to enter is provided on the circumference of the sixth supporting plate (33); a hexagonal groove (6411) is provided on the side of the rotating plate (641) away from the rotating plate (62).

9. The whole vehicle environmental chamber emergency towing system according to claim 1, characterized in that: A support seat (13) is connected to the bottom of the mounting groove (11), and the support seat (13) is located at an end of the base (1) away from the hoist (4). The bottom end of the support plate (12) is inserted into the support seat (13), and a slide plate (123) is connected between the bottom ends of the two support plates (12). A U-shaped slide groove (131) is provided in the support seat (13) for the support plate (12) and the slide plate (123) to slide. A movable plate (124) is connected to a side of the slide plate (123) away from the hoist (4), and an end of the movable plate (124) away from the slide plate (123) extends out of the support seat (13). The movable plate (124) is away from the slide plate (123) and extends out of the support seat (13). The top surface of the end of the trailer plate (3) is connected to a clamping plate (125), the side of the support seat (13) close to the clamping plate (125) is connected to a sliding rod (132), and the circumference of the sliding rod (132) is sleeved with a second spring (133), one end of the second spring (133) is pressed against the side of the support seat (13), and the other end of the second spring (133) is pressed against the side of the clamping plate (125); two hydraulic cylinders (8) are installed on the top surface of the trailer plate (3), the piston rod ends of the two hydraulic cylinders (8) are connected to a support frame (81), and two support rods (811) are connected to both ends of the support frame (81), and the two support rods (811) at each end are used to clamp the tires of the test vehicle.

10. A vehicle environmental chamber emergency trailer control method, applicable to the vehicle environmental chamber emergency trailer system according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. When the tester observes smoke or fire, he turns on the fire extinguishing power of the terminal; S2. The terminal first controls the piston rod of the hydraulic cylinder (8) to extend, and lifts the test vehicle through the support frame (81) to separate the test tire from the base (1); S3. After the test vehicle is lifted up, the terminal starts the motor (44), the motor (44) drives the rotating shaft (45) to rotate, the rotating shaft (45) drives the first winding roller (46) and the second winding roller (47) to rotate, the first winding roller (46) winds the first traction rope (461), the second winding roller (47) releases the second traction rope (471), and the first traction rope (461) pulls the trailer board (3) to move outside the environmental chamber; S4. When the test vehicle moves outside the environmental chamber, the motor (44) stops driving the rotating shaft (45) to rotate, and the brake mechanism (5) brakes the trailer board (3); S5. Turn off the fire extinguishing power supply, the hydraulic cylinder (8) is depressurized, the piston rod is retracted into the hydraulic cylinder (8), and the support frame (81) drives the test vehicle to descend; S6. After the fire is extinguished, the scrapped vehicle is towed away and the vehicle to be tested is replaced; S7. Rotate the reinforcing rod (647) to insert the bolt (648) into the positioning hole (331); S8. Start the working power supply of the terminal, the hydraulic cylinder (8) drives the support frame (81) to lift the test vehicle; S9. The motor (44) drives the rotating shaft (45) to rotate, and the rotating shaft (45) drives the first winding roller (46) and the second winding roller (47) to rotate together, the second winding roller (47) winds the second traction rope (471), the first winding roller (46) releases the first traction rope (461), and the second traction rope (471) pulls the trailer board (3) into the environmental chamber; S10. When the test vehicle moves into the environmental chamber, the motor (44) stops driving the rotating shaft (45) to rotate, the bolt (648) is unscrewed from the positioning hole (331), and the brake mechanism (5) brakes the trailer plate (3); S11. Turn off the working power supply, release the pressure of the hydraulic cylinder (8), retract the piston rod into the hydraulic cylinder (8), and the support frame (81) drives the test vehicle to descend.

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