Trailer traction test device

Abstract

The invention discloses a trailer traction test device, which belongs to the technical field of vehicle traction test, and comprises a base, a mounting frame, and a traction drive frame. The mounting frame and the traction drive frame suspend and support a traction device on the base. The traction drive frame is used to provide traction force to the traction device. In actual operation, traction forces in different directions can be generated according to needs through the coordinated action of left and right, traction and up and down drive components, thereby comprehensively simulating the complex loads such as horizontal, turning and climbing that the traction device of the trailer is subjected to during operation, overcoming the limitations of traditional field tests on sites, vehicles and safety, and being able to efficiently and accurately evaluate the performance of the traction device without relying on real scenes.

Description

Technical Field

[0001] The invention relates to a trailer traction test device, belonging to the technical field of vehicle traction test. Background Art

[0002] With the rapid development of the automobile industry, trailers, as an important tool for logistics and transportation, are receiving more and more attention for their safety and reliability. In order to ensure the normal operation of trailers under various working conditions, the research and development of traction test devices is particularly important.

[0003] In the existing trailer towing test technology, most of the field tests are conducted using real vehicles. Although this method can simulate actual working conditions, it has many limitations. First, field testing requires a lot of manpower, material resources and time costs, and is affected by various factors such as weather and road conditions, and it is difficult to ensure the consistency of test results. Secondly, field testing has high requirements for test sites and requires special test sites and facilities, which undoubtedly increases the difficulty and cost of testing. Finally, field testing has certain safety hazards. Once an accident occurs, it may cause vehicle damage or even casualties.

[0004] In order to solve the above problems, the present invention proposes a trailer towing test device. Summary of the invention

[0005] The object of the present invention is to provide a trailer towing test device to solve the problems raised in the above background technology.

[0006] In order to achieve the above object, the present invention adopts the following technical solution: a trailer traction test device, comprising:

[0007] Pedestal;

[0008] A mounting frame, the center position of which is rotatably connected to one end of the base;

[0009] A traction drive frame, which is arranged at one end of the base away from the mounting frame. The mounting frame and the traction drive frame suspend and support the traction device on the base. The traction drive frame is used to provide traction force to the traction device.

[0010] Two resistance units, the two resistance units are respectively arranged on both sides of the base, the two resistance units each include a cylinder and a resistance rod, the two cylinders are hinged on the base, one end of the two resistance rods away from the cylinders is hinged on the mounting frame, and the hinge points of the two cylinders and the hinge points of the two resistance rods are projected on the base to form a quadrilateral structure;

[0011] The resistance rod slides in the cylinder and is subject to the resistance of the hydraulic pressure in the cylinder. The resistance encountered by the resistance rod acts on the mounting frame to simulate the resistance encountered by the traction device when turning and traction.

[0012] Preferably, the distance between the hinge points of the two resistance rods is smaller than the hinge points of the two cylinder barrels, and the hinge points of the two cylinder barrels and the hinge points of the two resistance rods are projected onto the base to form a trapezoidal structure.

[0013] Preferably, the traction drive frame includes a frame body and a connector. The frame body is slidably connected to the base through left and right drive components. The connector is arranged on the frame body, and the connector pulls the traction device in the direction of the frame body.

[0014] Preferably, the left and right driving components include a slide rail, a gear wall and a motor. The slide rail is arranged on the base and is arc-shaped. The arc center of the slide rail coincides with the rotating shaft of the mounting frame. The frame is slidably connected to the slide rail. The gear wall is arranged on the side wall of the slide rail. The gear wall is adapted to the shape of the slide rail. The motor is fixedly mounted on the frame, and the driving gear connected to the output end of the motor is meshed with the gear wall.

[0015] Preferably, a traction drive assembly is also provided on the frame, and the traction drive assembly includes a mounting block and a first oil cylinder, the mounting block is connected to the frame, and the first oil cylinder is provided on the mounting block;

[0016] Wherein, the connecting head is connected to the end of the output shaft of the first oil cylinder.

[0017] Preferably, the frame is further provided with an up-and-down driving assembly, which includes a support beam and a second oil cylinder, the support beam is vertically slidably connected to the frame, the second oil cylinder is fixed to the upper end of the frame, and the output shaft end of the second oil cylinder is connected to the side wall of the support beam;

[0018] Wherein, the mounting block is rotatably connected to the side wall of the support beam.

[0019] Preferably, a tension sensor for detecting traction force is provided on the connector. The tension sensor can sense and feedback the magnitude of traction force in real time, which helps to accurately control the operation process. At the same time, it ensures that it can respond in time when it exceeds the safe traction force range, thereby preventing equipment damage or operational accidents caused by excessive traction force.

[0020] Preferably, a trailer traction test device also includes a strain gauge, which is attached to the surface of the traction device. The strain gauge effectively detects the tiny deformation of the traction device when it is subjected to traction force. The deformation is proportional to the applied traction force. Therefore, by measuring the deformation of the strain gauge, the force performance of the traction device can be analyzed.

[0021] Preferably, the resistance unit further comprises an oil tank, a high-pressure oil pipe and a hydraulic valve. The oil tank is used to provide high-pressure oil to the cavity of the cylinder. The high-pressure oil pipe is connected between the oil tank and the cylinder to form a passage between the oil tank and the rodless chamber of the cylinder. The hydraulic valve is arranged on the high-pressure oil pipe to adjust the flow rate of the high-pressure oil pipe.

[0022] When the flow rate of the high-pressure oil pipe regulated by the hydraulic valve increases, the hydraulic resistance of the resistance rod decreases, and the resistance of the resistance rod on the mounting frame decreases, which is used to simulate the resistance of the traction device during turning and traction when the resistance is small;

[0023] When the hydraulic valve controls the flow of the high-pressure oil pipe to decrease, the hydraulic resistance on the resistance rod increases, and the resistance exerted by the resistance rod on the mounting frame increases, which is used to simulate the resistance encountered by the traction device during turning and traction when the resistance is large.

[0024] Preferably, the hinge point between the cylinder and the base is lower than the hinge point between the resistance rod and the mounting frame, the cylinder and the resistance rod form a hypotenuse, and the base and the mounting frame are two right-angled sides respectively, forming a triangular support structure.

[0025] Compared with existing technologies:

[0026] 1. The present invention provides traction force to the traction device through the traction drive frame, and generates traction forces in different directions under the coordinated operation of the left and right drive components, the traction drive component and the upper and lower drive components according to the actual test situation. It can simulate the pulling force on the traction device when the trailer is running, and simulate the horizontal traction load, the turning traction load and the climbing traction load on the traction device during the actual traction process, so as to achieve a comprehensive performance evaluation of the traction device, overcome the limitations of traditional field tests, and can efficiently perform performance tests without relying on real vehicles and complex test sites, which not only greatly improves the test efficiency, but also reduces the test cost, saving a lot of resources for trailer manufacturing.

[0027] 2. When the traction device is installed on the mounting frame and the connecting head, the present invention utilizes the extension and retraction of the first oil cylinder to adjust the distance between the connecting head and the mounting frame, so that traction devices of different lengths can be installed, thereby achieving comprehensive testing of trailer traction devices of various models and specifications, making the testing work more convenient and improving the coverage and efficiency of the testing work. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the present invention.

[0029] Figure 2 It is a top view of the present invention.

[0030] Figure 3 It is a side view of the present invention.

[0031] Figure 4 This is a schematic diagram of the resistance unit structure of the present invention.

[0032] Figure 5 It is a schematic diagram of the structure of the base and the mounting frame of the present invention.

[0033] Figure 6 It is a structural schematic diagram of the base and the frame of the present invention.

[0034] In the figure: 1, base, 2, mounting frame, 3, traction drive frame, 301, frame body, 302, connector, 4, resistance unit, 401, cylinder, 402, resistance rod, 403, oil tank, 404, high-pressure oil pipe, 405, hydraulic valve, 5, left and right drive components, 501, slide rail, 502, motor, 503, gear wall, 6, traction drive component, 601, mounting block, 602, first oil cylinder, 7, upper and lower drive components, 701, support beam, 702, second oil cylinder, 8, tension sensor, 9, guide rod, 10, strain gauge, 11, connecting block, 12, first pin rod, 13, second pin rod, 14, slide groove. DETAILED DESCRIPTION

[0035] The present invention is described below with specific embodiments, but they are not intended to be limiting of the invention.

[0036] Embodiment 1

[0037] like Figure 1-Figure 6 As shown, in this embodiment, a trailer traction test device is provided, comprising a base 1, a mounting frame 2, a traction drive frame 3 and two resistance units 4;

[0038] The base 1 serves as the foundation of the entire device, supporting and connecting all other components. The mounting frame 2 is rotatably connected to one end of the base 1, so that the mounting frame 2 can rotate relative to the base 1, and when the traction drive frame 3 is operated to make the traction device tow the mounting frame 2, it can simulate the state of the traction device towing the frame when the trailer turns.

[0039] In addition, if Figure 1 , Figure 2 as well as Figure 5 As shown, two slide grooves 14 are provided on the base 1. The two slide grooves 14 are symmetrically distributed on the base 1 with respect to the rotation axis of the mounting frame 2 and are arc-shaped. The arc centers of the two slide grooves 14 coincide with the rotation axis of the mounting frame 2. The bottoms of both ends of the mounting frame 2 are slidably connected in the slide grooves 14 on the corresponding sides, thereby improving the stability of the mounting frame 2.

[0040] The traction drive frame 3 is arranged at one end of the base 1 away from the mounting frame 2, and its main function is to provide traction force to the traction device, which can simulate the pulling force on the traction device when the trailer is running, and test the performance of the traction device.

[0041] Two resistance units 4 are respectively arranged on both sides of the base 1 to simulate the resistance of the traction device when turning. Each resistance unit 4 includes a cylinder 401 and a resistance rod 402. The cylinder 401 is hinged on the base 1 (connected by a universal ball head structure), and the end of the resistance rod 402 away from the cylinder 401 is hinged on the mounting frame 2 (connected by a universal ball head structure). In this way, when the mounting frame 2 rotates, the resistance rod 402 will slide in the cylinder 401 and be resisted by the hydraulic pressure in the cylinder 401.

[0042] The resistance of the resistance rod 402 can directly act on the mounting frame 2, thereby simulating the resistance of the traction device when turning. The cylinder 401 can change the size of the resistance by adjusting the hydraulic pressure, thereby simulating the turning resistance under different conditions.

[0043] like Figure 1-Figure 4 As shown, in order to simulate the traction force generated by the traction device in the actual process, the distance between the hinge points of the two resistance rods 402 is smaller than the distance between the hinge points of the two cylinders 401, and the hinge points of the two cylinders 401 and the hinge points of the two resistance rods 402 are projected on the base 1 to form a trapezoidal structure;

[0044] like Figure 2 As shown, when the traction drive frame 3 is in a symmetrical state with respect to the center line of the base 1 , the trapezoid formed by the hinge points of the two cylinders 401 and the hinge points of the two resistance rods 402 projected on the base 1 is an isosceles trapezoid.

[0045] A trailer traction test device also includes a strain gauge 10, which is attached to the surface of the traction device. The strain gauge 10 effectively detects the tiny deformation of the traction device when it is subjected to traction force. The deformation is proportional to the applied traction force. Therefore, by measuring the deformation of the strain gauge 10, the force performance of the traction device can be analyzed.

[0046] The strain gauge 10 is attached to the surface of the traction device to accurately detect its tiny deformation under stress. Based on the principle that the strain gauge 10 can convert mechanical deformation into electrical signal output, the traction force of the traction device can be indirectly measured and evaluated.

[0047] When the traction device is subjected to traction force, its surface will produce tiny deformation proportional to the magnitude of the traction force. After the strain gauge 10 is attached to the surface of the traction device, it can sense these deformations in real time and produce changes in resistance value accordingly. The resistance change can be converted and amplified through the corresponding circuit, and finally output as a readable electrical signal.

[0048] By analyzing these electrical signals, the deformation of the traction device under stress can be understood, and then the stress performance of the traction device can be analyzed. For example, by observing the signal changes output by the strain gauge, the deformation degree and distribution of the traction device under different traction forces can be judged, as well as whether there are abnormalities or over-limit conditions. The analysis of stress performance is of great significance for evaluating the working state of the traction device, optimizing its design, and preventing potential failures. By real-time monitoring and analyzing the data of the strain gauge 10, the traction device can be more accurately controlled and maintained to ensure its safe and reliable operation.

[0049] Embodiment 2

[0050] like Figure 1-Figure 3 as well as Figure 6 As shown, on the basis of Example 1, in order to simulate the different traction forces generated by the traction device in the actual process, the traction drive frame 3 of this embodiment includes a frame body 301 and a connecting head 302. The frame body 301 is slidably connected to the base 1 through the left and right driving components 5. The connecting head 302 is arranged on the frame body 301, and the connecting head 302 pulls the traction device in the direction of the frame body 301.

[0051] In order to be able to install the traction device on the mounting frame 2 and the traction drive frame 3, two connecting blocks 11 are symmetrically connected to the side wall of the mounting frame 2 (at this time, the resistance rod 402 is connected to the connecting block 11 on the same side through a universal ball head structure), and the two connecting blocks 11 are connected to the first pin rod 12, the first pin rod 12 is arranged horizontally, and the first pin rod 12 is connected to the traction device connected to the frame end (the connecting frame end is the end of the traction device connected to the frame), and the first pin rod 12 can be in the form of a bolt. When the traction device is installed, the first pin rod 12 is unscrewed from the connecting block 11, which is convenient for the traction device to connect to the frame end Place it between the two connecting blocks 11. In this state, screw the first pin 12 onto the connecting block 11, and at the same time, the first pin 12 can be inserted into the socket of the traction device connected to the frame end, ensuring that the traction device is smoothly installed on the mounting frame 2. At this time, the traction device connected to the frame end can rotate up and down on the mounting frame 2; a U-shaped groove is provided on the connecting head 302, and a second pin 13 is vertically inserted thereon. After the traction device connected to the front end is inserted into the U-shaped groove, the traction device connection plug end is pinned by the second pin 13. At this time, the traction device connected to the front end can rotate horizontally on the connecting head 302.

[0052] The left and right driving components 5 include a slide rail 501, a tooth wall 503 and a motor 502. The slide rail 501 is set on the base 1 and has an arc shape. The arc center of the slide rail 501 coincides with the rotating shaft of the mounting frame 2. The frame body 301 is slidably connected to the slide rail 501. The tooth wall 503 is set on the side wall of the slide rail 501. The tooth wall 503 is adapted to the shape of the slide rail 501. The motor 502 is fixedly installed on the frame body 301, and the driving gear connected to the output end of the motor 502 is meshed and connected to the tooth wall 503.

[0053] When the motor 502 is running, the output shaft of the motor 502 drives the driving gear to rotate, causing the driving gear to roll on the tooth wall 503, and then the driving gear and the tooth wall 503 cooperate to drive the frame 301 to slide on the slide rail 501, in this process, the turning process of the trailer can be simulated.

[0054] The slide rail 501 is arc-shaped, and its arc center coincides with the rotation axis of the mounting frame 2. The sliding motion of the frame body 301 on the slide rail 501 can simulate the circular motion of the trailer when turning. The shape of the slide rail 501 ensures that the trajectory of the motion is consistent with the actual turning situation, thereby improving the accuracy of the simulation.

[0055] A tooth wall 503 is provided on the side wall of the slide rail 501, and a motor 502 is fixedly installed on the frame 301, and a driving gear connected to the output end thereof meshes with the tooth wall 503. This ensures that the sliding movement of the frame 301 on the slide rail 501 is both smooth and accurate, and the motor 502 drives the driving gear to roll on the tooth wall 503, thereby pushing the frame 301 to move along the slide rail 501.

[0056] When the motor 502 is running, the frame 301 can slide on the slide rail 501 through the cooperation of the driving gear and the tooth wall 503. The sliding motion simulates the turning process of the trailer, so that the test device can simulate various force conditions when turning in the actual environment.

[0057] A traction drive assembly 6 is also provided on the frame 301 , and the traction drive assembly 6 includes a mounting block 601 and a first oil cylinder 602 . The mounting block 601 is connected to the frame 301 , the first oil cylinder 602 is provided on the mounting block 601 , and the connector 302 is connected to the end of the output shaft of the first oil cylinder 602 .

[0058] In addition, a plurality of guide rods 9 are fixed on the side wall of the connector 302, and the plurality of guide rods 9 are slidably sleeved on the side wall of the mounting block 601, and the setting direction of the plurality of guide rods 9 is parallel to the extension direction of the output shaft of the first oil cylinder 602;

[0059] Furthermore, when the traction device is installed on the mounting frame 2 and the connecting head 302, the distance between the connecting head 302 and the mounting frame 2 can be adjusted by utilizing the extension and retraction of the first oil cylinder 602, so that traction devices of different lengths can be installed, and the scope of application is expanded.

[0060] An up and down driving assembly 7 is also provided on the frame 301, and the up and down driving assembly 7 includes a support beam 701 and a second oil cylinder 702. The support beam 701 is vertically slidably connected to the frame 301, the second oil cylinder 702 is fixed to the upper end of the frame 301, the output shaft end of the second oil cylinder 702 is connected to the side wall of the support beam 701, and the mounting block 601 is rotatably connected to the side wall of the support beam 701.

[0061] When the second oil cylinder 702 pulls the support beam 701 to move upward on the frame 301, the support beam 701 moves upward with the mounting block 601. At this time, the connector 302 pulls one end of the traction device to rotate upward. At this time, the traction direction of the connector 302 is always on the center line of the traction device through the mounting block 601 rotating on the support beam 701. At this time, the movement process of the traction device when the front end of the trailer is climbing a slope is simulated;

[0062] When the second oil cylinder 702 pushes the support beam 701 to move downward on the frame 301, the support beam 701 moves downward with the mounting block 601. At this time, the connecting head 302 pulls one end of the traction device to rotate downward. At this time, the mounting block 601 rotates on the support beam 701, and the traction direction of the connecting head 302 is always on the center line of the traction device. At this time, the movement process of the traction device when the front of the trailer goes downhill is simulated.

[0063] In practice, it is difficult to perform multiple turns, accelerations, uphill and downhill driving, and working condition driving with the same load and traction. The operation of the traction drive frame 3 (left and right drive components 5, traction drive component 6, and up and down drive component 7) can simulate the repeated actions in the actual operation of the trailer, so as to test the durability.

[0064] A tension sensor 8 for detecting traction force is provided on the connector 302. The tension sensor 8 can sense and feedback the magnitude of the traction force in real time, which helps to accurately control the operation process. At the same time, it ensures that a timely response can be made when the safe traction force range is exceeded, thereby preventing equipment damage or operation accidents caused by excessive traction force.

[0065] Embodiment 3

[0066] like Figure 1-Figure 4As shown, on the basis of the first embodiment, in order to be able to adjust the traction force generated by the traction device in the actual process during the test, the resistance unit 4 also includes an oil tank 403, a high-pressure oil pipe 404 and a hydraulic valve 405. The oil tank 403 is used to provide high-pressure oil to the cavity of the cylinder 401. The high-pressure oil pipe 404 is connected between the oil tank 403 and the cylinder 401 to form a passage between the oil tank 403 and the rodless cavity oil circuit of the cylinder 401. The hydraulic valve 405 is arranged on the high-pressure oil pipe 404 to adjust the flow rate of the high-pressure oil pipe 404. When the hydraulic valve 405 regulates the flow rate of the high-pressure oil pipe 404 to increase, the hydraulic resistance of the resistance rod 402 decreases, and the resistance of the resistance rod 402 on the mounting frame 2 decreases, which is used to simulate the resistance encountered by the traction device during turning and traction when the resistance is small. When the hydraulic valve 405 regulates the flow rate of the high-pressure oil pipe 404 to decrease, the hydraulic resistance of the resistance rod 402 increases, and the resistance of the resistance rod 402 on the mounting frame 2 increases, which is used to simulate the resistance encountered by the traction device during turning and traction when the resistance is large.

[0067] The oil tank 403 provides high-pressure oil to the cavity of the cylinder 401 to ensure that the cylinder 401 can generate sufficient resistance.

[0068] The high-pressure oil pipe 404 connects the oil tank 403 and the cylinder barrel 401 , forming a passage of the rodless chamber oil circuit, thereby ensuring that the oil can flow smoothly between the oil tank 403 and the cylinder barrel 401 .

[0069] The hydraulic valve 405 is arranged on the high-pressure oil pipe 404 and plays a key role in regulating the flow rate.

[0070] When the hydraulic valve 405 increases the flow rate of the high-pressure oil pipe 404, the amount of oil entering or flowing out of the cylinder 401 increases, resulting in a decrease in the resistance of the cylinder 401 to the resistance rod 402. In this way, the resistance of the resistance rod 402 on the mounting frame 2 will also be reduced accordingly, thereby simulating the resistance of the traction device during the turning traction process when the resistance is small.

[0071] On the contrary, when the hydraulic valve 405 regulates the flow rate of the high-pressure oil pipe 404 to decrease, the amount of oil entering or flowing out of the cylinder 401 decreases, and the resistance of the cylinder 401 to the resistance rod 402 increases. Therefore, the resistance of the resistance rod 402 on the mounting frame 2 will also increase accordingly, simulating the resistance of the traction device during the turning traction process when the resistance is large.

[0072] like Figure 4 As shown, a high-pressure oil pipe 404 is disposed between each of the two cylinder barrels 401 and the oil tank 403 , and a hydraulic valve 405 is disposed on each of the high-pressure oil pipes 404 .

[0073] The working process is:

[0074] Traction drive frame 3 simulates along Figure 2 When turning in the direction of the arrow shown, during the rotation of the traction drive frame 3, the traction drive frame 3 deflects with one end of the traction device, causing the traction device to pull the mounting frame 2 to swing. At this time, during the swinging process of the mounting frame 2, the resistance rod 402 on the right side extends, that is, the high-pressure oil in the oil tank 403 is injected into the rodless cavity of the cylinder 401 along the high-pressure oil pipe 404, and the resistance rod 402 on the left side contracts, that is, the high-pressure oil in the rodless cavity of the cylinder 401 is injected into the interior of the oil tank 403 along the high-pressure oil pipe 404;

[0075] After the flow rate of the high-pressure oil pipe 404 is adjusted and controlled by the hydraulic valve 405, the flow of the high-pressure oil will produce different hydraulic resistances per unit time, and the resistance is constant during the uniform speed operation of the traction drive frame 3. At this time, under the state of constant resistance, the force analysis of the traction device during the turning process is performed.

[0076] Embodiment 4

[0077] like Figure 1-Figure 3 As shown, based on the first embodiment, in order to enable the resistance unit 4 to support the mounting frame 2 and increase the stability of the mounting frame 2, the hinge point between the cylinder 401 and the base 1 is lower than the hinge point between the resistance rod 402 and the mounting frame 2, the cylinder 401 and the resistance rod 402 form a hypotenuse, and the base 1 and the mounting frame 2 are two right-angled sides, forming a triangular support structure, such as Figure 1 As shown, the triangular support structure is a spatial triangular structure, and the support is more stable. When simulating horizontal traction, upward or downward traction of the traction device (horizontal road straight driving traction, straight driving and uphill driving), the mounting frame 2 is in the following position: Figure 2 In the state shown, the resistance unit 4 is not running (i.e., the amount of high-pressure oil in the cylinder 401 does not change), the resistance rod 402 is relatively fixed to the cylinder 401, and the cylinder 401 and the resistance rod 402 support the mounting frame 2 to ensure the stability of the mounting frame 2, that is, to ensure the stability of the traction test.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A trailer traction test device, characterized in that: include: Base (1); A mounting frame (2), wherein the center position of the mounting frame (2) is rotatably connected to one end of the base (1); A traction drive frame (3), wherein the traction drive frame (3) is arranged at one end of the base (1) away from the mounting frame (2), the mounting frame (2) and the traction drive frame (3) suspend and support the traction device on the base (1), and the traction drive frame (3) is used to provide a traction force to the traction device; Two resistance units (4), the two resistance units (4) being respectively arranged on both sides of the base (1), the two resistance units (4) each comprising a cylinder (401) and a resistance rod (402), the two cylinders (401) being hinged on the base (1), the two resistance rods (402) being hinged on the mounting frame (2) at one end away from the cylinders (401), the hinge points of the two cylinders (401) and the hinge points of the two resistance rods (402) being projected onto the base (1) to form a quadrilateral structure; The resistance rod (402) slides in the cylinder (401) and is subject to the resistance of the hydraulic pressure in the cylinder (401), and the resistance experienced by the resistance rod (402) acts on the mounting frame (2).

2. A trailer traction test device according to claim 1, characterized in that: The distance between the hinge points of the two resistance rods (402) is smaller than the distance between the hinge points of the two cylinder barrels (401), and the hinge points of the two cylinder barrels (401) and the hinge points of the two resistance rods (402) are projected onto the base (1) to form a trapezoidal structure.

3. A trailer traction test device according to claim 1, characterized in that: The traction drive frame (3) comprises: A frame (301), wherein the frame (301) is slidably connected to the base (1) via left and right drive components (5); A connecting head (302), wherein the connecting head (302) is arranged on the frame (301), and the connecting head (302) pulls the pulling device in the direction of the frame (301).

4. A trailer traction test device according to claim 3, characterized in that: The left and right driving components (5) include: A slide rail (501), wherein the slide rail (501) is arranged on the base (1) and is in an arc shape, the arc center of the slide rail (501) coincides with the rotation axis of the mounting frame (2), and the frame body (301) is slidably connected to the slide rail (501); A tooth wall (503), wherein the tooth wall (503) is arranged on a side wall of the slide rail (501), and the shape of the tooth wall (503) matches that of the slide rail (501); A motor (502), the motor (502) being fixedly mounted on the frame (301), and a driving gear connected to an output end of the motor (502) being meshedly connected to a tooth wall (503).

5. The trailer traction test device according to claim 3, characterized in that: The frame (301) is also provided with a traction drive assembly (6), and the traction drive assembly (6) comprises: A mounting block (601), the mounting block (601) being connected to the frame (301); A first oil cylinder (602), the first oil cylinder (602) being arranged on the mounting block (601); The connecting head (302) is connected to the end of the output shaft of the first oil cylinder (602).

6. A trailer traction test device according to claim 5, characterized in that: The frame (301) is also provided with an up-and-down driving assembly (7), and the up-and-down driving assembly (7) comprises: A support beam (701), wherein the support beam (701) is vertically slidably connected to the frame (301); A second oil cylinder (702), the second oil cylinder (702) being fixed to the upper end of the frame (301), and the end of the output shaft of the second oil cylinder (702) being connected to the side wall of the support beam (701); Wherein, the mounting block (601) is rotatably connected to the side wall of the support beam (701).

7. The trailer traction test device according to claim 3, characterized in that: The connecting head (302) is provided with a tension sensor (8) for detecting traction force.

8. The trailer traction test device according to claim 1, characterized in that: It also comprises a strain gauge (10), wherein the strain gauge (10) is attached to the surface of the traction device.

9. The trailer traction test device according to claim 1, characterized in that: The resistance unit (4) further comprises: An oil tank (403) is used to provide high-pressure oil to the cavity of the cylinder (401); A high-pressure oil pipe (404), the high-pressure oil pipe (404) is connected between the oil tank (403) and the cylinder barrel (401), forming a passage for the rodless chamber oil path between the oil tank (403) and the cylinder barrel (401); A hydraulic valve (405), the hydraulic valve (405) is arranged on the high-pressure oil pipe (404) to adjust the flow rate of the high-pressure oil pipe (404); When the hydraulic valve (405) regulates the flow rate of the high-pressure oil pipe (404) to increase, the hydraulic resistance of the resistance rod (402) decreases, and the resistance of the resistance rod (402) on the mounting frame (2) decreases; When the hydraulic valve (405) regulates the flow rate of the high-pressure oil pipe (404) to decrease, the hydraulic resistance of the resistance rod (402) increases, and the resistance of the resistance rod (402) on the mounting frame (2) increases.

10. The trailer traction test device according to claim 1, characterized in that: The hinge point between the cylinder (401) and the base (1) is lower than the hinge point between the resistance rod (402) and the mounting frame (2); the cylinder (401) and the resistance rod (402) form a hypotenuse, and the base (1) and the mounting frame (2) are two right-angled sides, forming a triangular support structure.

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