Plastic fuel tank rear impact test device and test method

Abstract

The present invention discloses a rear impact test device for a plastic fuel tank and a test method thereof, which relates to the field of plastic fuel tank testing, and includes a test track and a monitor fixedly connected to one side of its top, wherein one side of the test track is fixedly connected to a rotating shaft, the inner side of the rotating shaft is rotatably connected to a slope, one side of the slope is installed with a control mechanism, the bottom of the control mechanism is installed with a lifting mechanism, the bottom of the lifting mechanism is installed with a moving mechanism, and the control mechanism is used to position the impact object. The present invention, when conducting multiple groups of tests, adopts a control variable method to adjust the amount of fuel inside the fuel tank, which can not only accurately calculate the force borne by the fuel tank shell based on the kinetic energy and fuel amount at the time of impact, but also effectively evaluate the fuel leakage caused by the plastic fuel tank being broken after the impact, and in addition, fuel tanks of different sizes are taken into account to ensure the wide applicability and accuracy of the test results.

Description

Technical Field

[0001] The invention relates to the technical field of plastic fuel tank testing, in particular to a rear impact testing device and a testing method for a plastic fuel tank. Background Art

[0002] The plastic fuel tank is the core system component of the entire fuel system. It has good formability, chemical corrosion resistance, thermal insulation, durability and other characteristics. The impact test can evaluate the impact resistance and structural stability of the plastic fuel tank when the vehicle is involved in an accident.

[0003] For example, the "A plastic fuel tank rear impact test device" with publication number: CN205449427U includes a horizontal frame, a vertical frame, a motor, a steel wire rope, an impact trolley, and a collision wall. The collision wall is arranged at one end of the horizontal frame, and the vertical frame is arranged at the other end of the horizontal frame. A platform for placing the plastic fuel tank is arranged on the horizontal frame near the collision wall. The horizontal frame and the vertical frame are provided with connected tracks. The impact trolley is arranged on the track. A pulley is provided on the top of the vertical frame. The motor is located at the bottom of the vertical frame. The steel wire rope passes through one end of the pulley and is connected to the impact trolley, and the other end of the steel wire rope is connected to the motor.

[0004] However, in the prior art, during the rear impact test of a plastic fuel tank, the fuel inside the plastic fuel tank will generally affect the impact test results, and the amount of fuel inside will further affect the impact test. The presence of fuel not only changes the overall mass and center of mass position of the fuel tank, but also affects the energy distribution during the impact and the deformation mode of the fuel tank. During the impact, the fuel will shake or flow in the fuel tank, which will cause uneven pressure distribution inside the fuel tank, thereby affecting the deformation of the fuel tank and the test results. In addition, the shaking of the fuel also generates additional impact force or torque, which affects the impact test results of the fuel tank. Summary of the invention

[0005] The purpose of the present invention is to provide a plastic fuel tank rear impact test device and a test method thereof, so as to solve the problem raised in the above background technology that during the impact process, the fuel will shake or flow in the fuel tank, which will cause uneven pressure distribution inside the fuel tank, thereby affecting the deformation of the fuel tank and the test results.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a rear impact test device for a plastic fuel tank, comprising a test track and a monitor fixedly connected to one side of the top thereof, a rotating shaft fixedly connected to one side of the test track, a ramp rotatably connected to the inner side of the rotating shaft, a control mechanism installed on one side of the ramp, a lifting mechanism installed at the bottom of the control mechanism, a moving mechanism installed at the bottom of the lifting mechanism, the control mechanism used to position the impactor, and the moving mechanism used to control the position of the impactor;

[0007] The lifting mechanism comprises a top plate and a connecting plate, two second scissor-type frames are installed between the top plate and the connecting plate, a second connecting frame is fixedly connected between the bottom ends of the two second scissor-type frames, and a first connecting frame is fixedly connected between the middle parts of the two second scissor-type frames, a fixing rod is fixedly connected between the top ends of the two second scissor-type frames, two second hydraulic cylinders are rotatably connected between the first connecting frame and the second connecting frame, two limit plates are fixedly connected to the bottom of the top plate and the top of the connecting plate, the limit rod is slidably connected inside the limit plate, a baffle is fixedly connected to one end of the limit rod, and the diameter of the baffle is larger than the diameter of the limit hole on the surface of the limit plate;

[0008] The control mechanism includes a support frame, a first cylinder is installed on the top of one side of the support frame, a pushing assembly is connected to the bottom of the first cylinder, the bottom of the support frame is fixedly connected to the top of the top plate, a second cylinder is installed on the top of the top plate, and a positioning clamp is fixedly connected to the output end of the second cylinder;

[0009] The pushing assembly includes a lifting block and a pushing plate, a first scissor-type frame is installed between the lifting block and the pushing plate, racks are provided on both sides of the first scissor-type frame, one side of the rack is meshed with a gear, the gear is rotatably connected to the first scissor-type frame, the bottom of the first scissor-type frame is fixedly connected to the first sliding block, and the top of the first scissor-type frame is fixedly connected to the first guide block, a second driving motor is installed on one side of the lifting block, an output end of one side of the lifting block is fixedly connected to the first screw rod, an input end of the first screw rod is fixedly connected to the output end of the second driving motor, an outer surface of the first screw rod is threadedly connected to the first sliding block, one side of the pushing plate is fixedly connected to the guide frame, the guide frame is slidably connected to the first guide block, the top of the lifting block is fixedly connected to the bottom of the first cylinder, and two sliding rods are fixedly connected to the top of the lifting block, the top of the sliding rod passes through the supporting frame, and the supporting frame is slidably connected to the sliding rod.

[0010] Preferably, the moving mechanism includes a base plate, two guide rods are fixedly connected to the inner side of the base plate, two second screw rods are installed between the two guide rods, the second screw rods are rotatably connected to the inner wall of the base plate, two second guide blocks are slidably connected to the surface of the guide rod, a second sliding block is threadedly connected to the surface of the second screw rod, and a moving plate is fixedly connected to the top of the second sliding block.

[0011] Preferably, two first drive motors are installed on one side of the base plate, the output end of the first drive motor is fixedly connected to the second screw rod, the top of the movable plate is fixedly connected to the bottom of the connecting plate, both sides of the bottom of the movable plate are fixedly connected to the top of the second guide block, and an inclined plate is installed on one side of the base plate.

[0012] Preferably, two first hydraulic cylinders are installed on one side of the bottom of the slope, and both ends of the first hydraulic cylinders are rotatably connected to rotating frames, one of the rotating frames is fixedly connected to the bottom of the slope, and the bottom of the other rotating frame is fixedly connected to the bottom plate.

[0013] The rear impact test method for plastic fuel tanks includes the following steps:

[0014] Step 1: Preliminary preparation: First, fix the plastic fuel tank to be tested on one side of the monitor, and make the plastic fuel tank abut against the monitor. Use the inclined plate to facilitate the movement of the impact vehicle used for the test to the top of the top plate. After the movement is completed, use the second cylinder to push the positioning clamp to position the tire of the impact vehicle.

[0015] Step 2: Adjust the angle and height. Use the two first hydraulic cylinders to cooperate with the rotating frame to control the angle of the slope. During the adjustment process, the slope will rotate around the rotating axis. After the adjustment is completed, the two second hydraulic cylinders are started to move the first connecting frame and the second connecting frame. During this process, the two second scissor frames will begin to unfold, so that the top plate is away from the connecting plate, thereby controlling the height of the top plate to be consistent with the height of the slope;

[0016] Step 3: Alignment and calibration: the two first drive motors are started to drive the second screws to rotate, so that the second sliding blocks on the surfaces of the two second screws move at the same time. The movement of the second sliding blocks further drives the moving plate to move, thereby controlling the movement of the entire lifting mechanism so that the top plate is aligned with the slope.

[0017] Step 4: Start the collision. The first cylinder controls the lifting block to move downward so that the push plate is at the same height as the impact vehicle. Then, the second drive motor starts to drive the first screw rod to rotate, so that the first sliding block on the first screw rod starts to move, and the first sliding block drives the first scissor frame to unfold. The unfolding of the first scissor frame pushes the push plate away from the lifting block, completing the pushing of the impact vehicle and moving toward the slope.

[0018] Step 5: Record and summarize. The impact vehicle slides down the slope and hits the plastic fuel tank. Observe the impact results. Then adjust the height of the slope and control the amount of fuel inside the plastic fuel tank several times. Repeat the test in the same way, record the test data and calculations, and summarize the plastic fuel tank impact test results.

[0019] Preferably, the kinetic energy of the vehicle hitting the plastic fuel tank in step 4 is , the calculation formula is:

[0020] ;

[0021] in, is the mass of the object, is the acceleration due to gravity, take 9.8 m / s²; is the height of the object; is the magnitude of the friction force, in Newton N; It is the displacement of the object under the action of friction, in meters.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. In the present invention, by operating the two first hydraulic cylinders, the inclination angle of the slope can be easily adjusted, so as to accurately set the slope of the impact test. This adjustment ensures the repeatability and comparability of the test conditions, and provides an important guarantee for the accuracy and reliability of the test results. When the second hydraulic cylinder is started, the two second scissor frames can be smoothly unfolded through the linkage of the first connecting frame and the second connecting frame. As the second scissor frames are extended, the height of the top plate can be gradually increased or decreased, so as to achieve fine control of the height of the vehicle. This flexible adjustment method enables us to conveniently change the height of the vehicle at any time according to the test requirements, and then accurately adjust the impact kinetic energy received by the plastic fuel tank. This adjustability not only enhances the pertinence of the test, but also improves its practicability, and can more comprehensively evaluate the performance of the plastic fuel tank under different impact conditions.

[0024] 2. In the present invention, the rotation of the second screw rod can be accurately controlled by the operation of the first drive motor, so that the two second sliding blocks can work together to drive the movable plate to move smoothly, so that the vehicle on the top plate can smoothly approach the slope. Subsequently, the second drive motor is started to drive the first screw rod to rotate. As the first screw rod rotates, the first sliding block starts to move, thereby triggering the deployment action of the first scissors frame. During this process, the stable deployment of the first scissors frame pushes the pushing plate gradually away from the lifting block. The purpose of this pushing action is to apply an appropriate initial velocity to the vehicle to ensure that the vehicle can slide smoothly and smoothly along the surface of the slope, and finally accurately hit the plastic fuel tank located on one side of the monitor. In this way, the impact situation in the actual scene can be effectively simulated, so as to accurately evaluate the impact resistance of the plastic fuel tank.

[0025] 3. In the present invention, when conducting multiple groups of tests, the control variable method is used to adjust the amount of fuel inside the fuel tank. Not only can the force borne by the fuel tank shell be accurately calculated based on the kinetic energy and fuel amount at the time of impact, but also the fuel leakage caused by the breakage of the plastic fuel tank after the impact can be effectively evaluated. In addition, fuel tanks of different sizes are also taken into account to ensure the wide applicability and accuracy of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the rear impact test device for a plastic fuel tank of the present invention;

[0027] Figure 2 It is a schematic diagram of the side structure of the rear impact test device for a plastic fuel tank of the present invention;

[0028] Figure 3 It is a partial structural schematic diagram of a rear impact test device for a plastic fuel tank of the present invention;

[0029] Figure 4 It is a structural schematic diagram of the lifting mechanism in the rear impact test device for a plastic fuel tank of the present invention;

[0030] Figure 5 It is a structural schematic diagram of the moving mechanism in the rear impact test device for a plastic fuel tank of the present invention;

[0031] Figure 6 It is a side structural schematic diagram of the control mechanism in the rear impact test device for a plastic fuel tank of the present invention;

[0032] Figure 7 It is a structural schematic diagram of a driving assembly of a rear impact test device for a plastic fuel tank of the present invention;

[0033] Figure 8 It is a schematic diagram of the partially disassembled structure of the pushing assembly of the rear impact test device for a plastic fuel tank of the present invention.

[0034] In the figure: 1, test track; 2, ramp; 21, first hydraulic cylinder; 22, rotating frame; 23, rotating shaft; 3, control mechanism; 31, support frame; 32, first cylinder; 33, slide bar; 34, push assembly; 341, lifting block; 342, push plate; 343, rack; 344, first scissor frame; 345, gear; 346, guide frame; 347, first sliding block; 348, first screw rod; 349, first guide block; 35, second cylinder; 36, positioning clamp; 4 , moving mechanism; 41, bottom plate; 42, first drive motor; 43, guide rod; 431, second guide block; 44, moving plate; 45, second screw rod; 451, second sliding block; 5, lifting mechanism; 51, second scissor frame; 52, top plate; 53, first connecting frame; 54, second connecting frame; 55, second hydraulic cylinder; 56, limit plate; 57, limit rod; 571, baffle; 58, fixed rod; 59, connecting plate; 6, monitor; 7, second drive motor; 8, inclined plate. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Example 1: Reference Figure 1-4 As shown: a rear impact test device for a plastic fuel tank, comprising a test track 1 and a monitor 6 fixedly connected to one side of its top, a rotating shaft 23 fixedly connected to one side of the test track 1, a ramp 2 rotatably connected to the inner side of the rotating shaft 23, a control mechanism 3 installed on one side of the ramp 2, a lifting mechanism 5 installed at the bottom of the control mechanism 3, a moving mechanism 4 installed at the bottom of the lifting mechanism 5, the control mechanism 3 is used to position the impact object, and the moving mechanism 4 is used to control the position of the impact object;

[0037] The lifting mechanism 5 includes a top plate 52 and a connecting plate 59, two second scissor-type frames 51 are installed between the top plate 52 and the connecting plate 59, a second connecting frame 54 is fixedly connected between the bottom ends of the two second scissor-type frames 51, and a first connecting frame 53 is fixedly connected between the middle parts of the two second scissor-type frames 51, a fixing rod 58 is fixedly connected between the top ends of the two second scissor-type frames 51, two second hydraulic cylinders 55 are rotatably connected between the first connecting frame 53 and the second connecting frame 54, two limit plates 56 are fixedly connected to the bottom of the top plate 52 and the top of the connecting plate 59, a limit rod 57 is slidably connected inside the limit plate 56, and a baffle 571 is fixedly connected to one end of the limit rod 57, and the diameter of the baffle 571 is larger than the aperture diameter of the limit hole on the surface of the limit plate 56.

[0038] In this embodiment, by precisely controlling the extension and contraction of the two first hydraulic cylinders 21, the angle of the ramp 2 can be effectively adjusted, thereby precisely controlling the slope during the impact. This allows for multiple tests. In the process of adjusting the angle of the ramp 2, the gravitational potential energy of the vehicle is utilized. When the angle of the ramp 2 is adjusted, the vehicle will be placed on the ramp 8, making it easier for the vehicle to move to the top of the top plate 52.

[0039] We use two second hydraulic cylinders 55 as the power source. When the second hydraulic cylinders 55 start to push, the first connecting frame 53 and the second connecting frame 54 will move accordingly, thereby triggering the deployment of the two second scissor frames 51. As the second scissor frames 51 are deployed, the top plate 52 will gradually move away from the connecting plate 59, thereby achieving precise adjustment of the vehicle height.

[0040] During this process, the limiting rods 57 are respectively installed at the top and bottom of the second scissor frame 51, and slide inside the limiting plate 56. This not only ensures the stability of the scissor frame during the unfolding process, but also plays a role in guiding and limiting, preventing the scissor frame from deflecting or jamming during the unfolding process.

[0041] By flexibly adjusting the height of the vehicle, we can easily adjust the impact kinetic energy of the plastic fuel tank at any time according to the test requirements. This adjustability makes the test more targeted and practical, and can more comprehensively evaluate the performance of the plastic fuel tank under different impact conditions.

[0042] Embodiment 2: Figure 3-5 As shown, the moving mechanism 4 includes a bottom plate 41, two guide rods 43 are fixedly connected to the inner side of the bottom plate 41, two second screw rods 45 are installed between the two guide rods 43, the second screw rod 45 is rotatably connected to the inner wall of the bottom plate 41, two second guide blocks 431 are slidably connected to the surface of the guide rod 43, a second sliding block 451 is threadedly connected to the surface of the second screw rod 45, and a moving plate 44 is fixedly connected to the top of the second sliding block 451. Two first drive motors 42 are installed on one side of the bottom plate 41, the output end of the first drive motor 42 is fixedly connected to the second screw rod 45, the top of the moving plate 44 is fixedly connected to the bottom of the connecting plate 59, and both sides of the bottom of the moving plate 44 are fixedly connected to the top of the second guide block 431, and an inclined plate 8 is installed on one side of the bottom plate 41.

[0043] In this embodiment, under the precise control of the two first drive motors 42, the second screw rod 45 starts to rotate. Since the two motors are synchronously controlled, the rotation speed and direction of the two second screw rods 45 are consistent, ensuring that the two second sliding blocks 451 can move simultaneously and smoothly. The movement of the second sliding block 451 can be accurately converted into the movement of the moving plate 44. In this way, when the second sliding block 451 slides on the screw rod, the moving plate 44 will also move in a specific direction accordingly.

[0044] As the moving plate 44 moves, the lifting mechanism 5 can change the distance between its top and the slope 2. This change in distance enables the lifting mechanism 5 to control the height of the vehicle during the test, ensuring that the vehicle can move to the top of the slope 2 smoothly.

[0045] During the movement of the moving plate 44, the guide rod 43 and the second guide block 431 on its surface play a vital role. The guide rod 43 provides a stable moving path for the moving plate 44, and the second guide block 431 ensures that the moving plate 44 always remains in the correct position during the movement. In this way, even under the influence of the external environment or other factors, the moving plate 44 can maintain its stability and avoid being skewed or offset.

[0046] In this way, the entire lifting mechanism 5 can accurately control the distance between its top and the slope 2, thereby ensuring that the vehicle can move safely and smoothly until the slope 2 slides and hits the plastic fuel tank.

[0047] Embodiment 3: According to Figure 6-8As shown, the control mechanism 3 includes a support frame 31, a first cylinder 32 is installed on the top of one side of the support frame 31, a pushing assembly 34 is connected to the bottom of the first cylinder 32, the bottom of the support frame 31 is fixedly connected to the top of the top plate 52, a second cylinder 35 is installed on the top of the top plate 52, and a positioning clamp 36 is fixedly connected to the output end of the second cylinder 35. The pushing assembly 34 includes a lifting block 341 and a pushing plate 342, a first scissor frame 344 is installed between the lifting block 341 and the pushing plate 342, racks 343 are arranged on both sides of the first scissor frame 344, a gear 345 is meshed and connected to one side of the rack 343, and the gear 345 is rotatably connected to the first scissor frame 344, a first sliding block 347 is fixedly connected to the bottom of the first scissor frame 344, and a first guide block 349 is fixedly connected to the top of the first scissor frame 344. A second driving motor 7 is installed on one side of the lifting block 341, a first screw rod 348 is fixedly connected to the output end of one side of the lifting block 341, an input end of the first screw rod 348 is fixedly connected to the output end of the second driving motor 7, an outer surface of the first screw rod 348 is threadedly connected to the first sliding block 347, a guide frame 346 is fixedly connected to one side of the push plate 342, and the guide frame 346 is slidably connected to the first guide block 349. The top of the lifting block 341 is fixedly connected to the bottom of the first cylinder 32, and two sliding rods 33 are fixedly connected to the top of the lifting block 341, the top of the sliding rod 33 passes through the support frame 31, and the support frame 31 is slidably connected to the sliding rod 33. Two first hydraulic cylinders 21 are installed on one side of the bottom of the slope 2, and both ends of the first hydraulic cylinder 21 are rotatably connected to the rotating frame 22, one of the rotating frames 22 is fixedly connected to the bottom of the slope 2, and the bottom of the other rotating frame 22 is fixedly connected to the bottom plate 41.

[0048] In this embodiment, after the vehicle is accurately moved to the top of the top plate 52, the first cylinder 32 is used for fine control to slowly move the lifting block 341 downward. During this process, the slide bar 33 will slide relative to the support frame 31 according to a predetermined trajectory, ensuring that the movement of the lifting block 341 is both stable and accurate.

[0049] When the lifting block 341 moves to the predetermined position, the next critical stage is entered. At this time, the second drive motor 7 starts to play a role, and it drives the first screw rod 348 to start moving. As the first screw rod 348 rotates, the first sliding block 347 starts to move along the direction of the screw rod.

[0050] As the first sliding block 347 moves, the first scissor frame 344 begins to gradually expand. In this process, the gear 345 rolls on the surface of the rack 343, not only achieving movement, but also accompanied by its own rotation, which not only ensures the stability of the transmission, but also makes the entire mechanism more smooth in action.

[0051] At the same time, the first guide block 349 at the top of the first scissor-type frame 344 slides on the surface of the guide frame 346. This ensures that the first scissor-type frame 344 can maintain the correct direction and posture during the unfolding process to avoid deviation or distortion.

[0052] When the first scissor frame 344 is fully unfolded, it pushes the push plate 342 away from the lifting block 341. The purpose of this pushing action is to apply an initial velocity to the vehicle so that the vehicle can slide smoothly along the surface of the slope 2 and finally hit the plastic fuel tank on the monitor 6 side.

[0053] Embodiment 4: A rear impact test method for a plastic fuel tank comprises the following steps:

[0054] 1) Preliminary preparation: First, fix the plastic fuel tank to be tested on one side of the monitor 6, and make the plastic fuel tank abut against the monitor 6. Use the inclined plate 8 to facilitate the movement of the impact vehicle used for the test to the top of the top plate 52. After the movement is completed, use the second cylinder 35 to push the positioning clamp 36 to position the tire of the impact vehicle;

[0055] 2) Adjust the angle and height. Use the two first hydraulic cylinders 21 to cooperate with the rotating frame 22 to control the angle of the slope 2. During the adjustment process, the slope 2 will rotate around the rotating shaft 23. After the adjustment is completed, the two second hydraulic cylinders 55 are started to move the first connecting frame 53 and the second connecting frame 54. During this process, the two second scissor frames 51 will begin to unfold, so that the top plate 52 is away from the connecting plate 59, thereby controlling the height of the top plate 52 to be consistent with the height of the slope 2;

[0056] 3) Alignment and calibration: the two first drive motors 42 are started to drive the second screw rods 45 to rotate, so that the second sliding blocks 451 on the surfaces of the two second screw rods 45 move simultaneously, and the movement of the second sliding blocks 451 further drives the moving plate 44 to move, thereby controlling the movement of the entire lifting mechanism 5, so that the top plate 52 is aligned with the slope 2;

[0057] 4) When the collision starts, the first cylinder 32 controls the lifting block 341 to move downward, so that the push plate 342 is at the same height as the collision vehicle. Then, the second drive motor 7 starts to drive the first screw rod 348 to rotate, so that the first sliding block 347 on the first screw rod 348 starts to move, and the first sliding block 347 drives the first scissor frame 344 to unfold. The unfolding of the first scissor frame 344 pushes the push plate 342 away from the lifting block 341, completing the pushing of the collision vehicle and moving it toward the slope 2;

[0058] 5) Record and summarize: The impact vehicle slides from slope 2 and hits the plastic fuel tank. Observe the impact results, then adjust the height of slope 2 and control the amount of fuel inside the plastic fuel tank several times. Repeat the test in the same way, record the test data and calculations, and summarize the plastic fuel tank impact test results.

[0059] The kinetic energy of the vehicle hitting the plastic fuel tank in step 4) , the calculation formula is:

[0060] ;

[0061] in, is the mass of the object, is the acceleration due to gravity, take 9.8 m / s²; is the height of the object; is the magnitude of the friction force, in Newton N; It is the displacement of the object under the action of friction, in meters.

[0062] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A rear impact test device for a plastic fuel tank, comprising a test track (1) and a monitor (6) fixedly connected to one side of its top, wherein a rotating shaft (23) is fixedly connected to one side of the test track (1), and a ramp (2) is rotatably connected to the inner side of the rotating shaft (23), characterized in that: A control mechanism (3) is installed on one side of the slope (2), a lifting mechanism (5) is installed at the bottom of the control mechanism (3), a moving mechanism (4) is installed at the bottom of the lifting mechanism (5), the control mechanism (3) is used to position the impact object, and the moving mechanism (4) is used to control the position of the impact object; The lifting mechanism (5) comprises a top plate (52) and a connecting plate (59), two second scissor-type frames (51) are installed between the top plate (52) and the connecting plate (59), a second connecting frame (54) is fixedly connected between the bottom ends of the two second scissor-type frames (51), a first connecting frame (53) is fixedly connected between the middle parts of the two second scissor-type frames (51), a fixing rod (58) is fixedly connected between the top ends of the two second scissor-type frames (51), two second hydraulic cylinders (55) are rotatably connected between the first connecting frame (53) and the second connecting frame (54), two limiting plates (56) are fixedly connected to the bottom of the top plate (52) and the top of the connecting plate (59), a limiting rod (57) is slidably connected to the inside of the limiting plate (56), a baffle (571) is fixedly connected to one end of the limiting rod (57), and the diameter of the baffle (571) is larger than the diameter of the limiting hole on the surface of the limiting plate (56); The control mechanism (3) comprises a support frame (31), a first cylinder (32) is mounted on the top of one side of the support frame (31), a pushing assembly (34) is connected to the bottom of the first cylinder (32), the bottom of the support frame (31) is fixedly connected to the top of a top plate (52), a second cylinder (35) is mounted on the top of the top plate (52), and a positioning clamp (36) is fixedly connected to the output end of the second cylinder (35); The pushing assembly (34) comprises a lifting block (341) and a pushing plate (342); a first scissor-type frame (344) is installed between the lifting block (341) and the pushing plate (342); racks (343) are provided on both sides of the first scissor-type frame (344); a gear (345) is meshedly connected to one side of the rack (343); the gear (345) is rotatably connected to the first scissor-type frame (344); a first sliding block (347) is fixedly connected to the bottom of the first scissor-type frame (344); and a first guide block (349) is fixedly connected to the top of the first scissor-type frame (344); a second driving motor (7) is installed on one side of the lifting block (341); and the lifting block (341) is provided with a plurality of gears (343) and a plurality of gears (345) are provided on the top of the first scissor-type frame (344). 41) A first screw rod (348) is fixedly connected to an output end on one side, an input end of the first screw rod (348) is fixedly connected to an output end of a second drive motor (7), an outer surface of the first screw rod (348) is threadedly connected to a first sliding block (347), a guide frame (346) is fixedly connected to one side of the push plate (342), the guide frame (346) is slidably connected to the first guide block (349), a top of the lifting block (341) is fixedly connected to a bottom of the first cylinder (32), and two sliding rods (33) are fixedly connected to the top of the lifting block (341), a top end of the sliding rod (33) passes through a support frame (31), and the support frame (31) is slidably connected to the sliding rod (33).

2. The rear impact test device for a plastic fuel tank according to claim 1, characterized in that: The moving mechanism (4) comprises a bottom plate (41), two guide rods (43) are fixedly connected to the inner side of the bottom plate (41), two second screw rods (45) are installed between the two guide rods (43), the second screw rods (45) are rotatably connected to the inner wall of the bottom plate (41), two second guide blocks (431) are slidably connected to the surface of the guide rods (43), a second sliding block (451) is threadedly connected to the surface of the second screw rod (45), and a moving plate (44) is fixedly connected to the top of the second sliding block (451).

3. The rear impact test device for a plastic fuel tank according to claim 2, characterized in that: Two first drive motors (42) are installed on one side of the bottom plate (41); the output end of the first drive motor (42) is fixedly connected to the second screw rod (45); the top of the movable plate (44) is fixedly connected to the bottom of the connecting plate (59); both sides of the bottom of the movable plate (44) are fixedly connected to the top of the second guide block (431); and an inclined plate (8) is installed on one side of the bottom plate (41).

4. The rear impact test device for a plastic fuel tank according to claim 3, characterized in that: Two first hydraulic cylinders (21) are installed on one side of the bottom of the slope (2), and both ends of the first hydraulic cylinders (21) are rotatably connected to rotating frames (22), one of the rotating frames (22) is fixedly connected to the bottom of the slope (2), and the bottom of the other rotating frame (22) is fixedly connected to the bottom plate (41).

5. Plastic fuel tank rear impact test method, characterized in that: The rear impact test device for a plastic fuel tank according to any one of claims 1 to 4 is used, comprising the following steps: S1. Preliminary preparation: first, fix the plastic fuel tank to be tested on one side of the monitor (6) so that the plastic fuel tank is in contact with the monitor (6), and use the inclined plate (8) to facilitate the movement of the impact vehicle used for the test to the top of the top plate (52). After the movement is completed, use the second cylinder (35) to push the positioning clamp (36) to position the tire of the impact vehicle; S2, adjusting the angle and height, using the two first hydraulic cylinders (21) to cooperate with the rotating frame (22) to control the angle of the slope (2). During the adjustment process, the slope (2) will rotate around the rotating shaft (23). After the adjustment is completed, the two second hydraulic cylinders (55) are started to move the first connecting frame (53) and the second connecting frame (54). During this process, the two second scissor frames (51) will begin to unfold, so that the top plate (52) is away from the connecting plate (59), thereby controlling the height of the top plate (52) to be consistent with the height of the slope (2); S3, alignment and calibration, the two first drive motors (42) are started to drive the second screw rods (45) to rotate, so that the second sliding blocks (451) on the surfaces of the two second screw rods (45) move simultaneously, and the movement of the second sliding blocks (451) further drives the moving plate (44) to move, thereby controlling the movement of the entire lifting mechanism (5) so that the top plate (52) is aligned with the slope (2); S4, the collision begins, the first cylinder (32) controls the lifting block (341) to move downward, so that the push plate (342) is at the same height as the collision vehicle, and then the second drive motor (7) starts to drive the first screw rod (348) to rotate, so that the first sliding block (347) on the first screw rod (348) starts to move, and the first sliding block (347) drives the first scissor frame (344) to unfold, and the unfolding of the first scissor frame (344) pushes the push plate (342) away from the lifting block (341), thereby completing the pushing of the collision vehicle and moving toward the slope (2); S5. Record and summarize: The impact vehicle slides down the slope (2) and impacts the plastic fuel tank. The impact result is observed. The height of the slope (2) is then adjusted multiple times and the amount of fuel inside the plastic fuel tank is controlled. The test is repeated in the same manner. The test data and calculations are recorded and the impact test results of the plastic fuel tank are summarized.

6. The rear impact test method for a plastic fuel tank according to claim 5, characterized in that: The kinetic energy of the vehicle hitting the plastic fuel tank in step S4 , the calculation formula is: ； in, is the mass of the object, is the acceleration due to gravity, take 9.8 m / s²; is the height of the object; is the magnitude of the friction force, in Newton N; It is the displacement of the object under the action of friction, in meters.

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