A tractor hook strength testing device

Abstract

This utility model discloses a tractor hook strength testing device, comprising: a base plate, a support frame on the upper part of the base plate, a hydraulic cylinder on the upper part of the support frame, a telescopic rod at the power output end of the hydraulic cylinder, a pressure plate at the lower part of the telescopic rod, a slide rail on the surface of the base plate, a sliding seat on the surface of the slide rail, the pressure plate on the upper part of the sliding seat, and a mounting seat on the side of the sliding seat. This utility model also includes a fixed seat between the slide rails, a mounting plate on the surface of the fixed seat, a load drive cylinder on the surface of the mounting plate, a drive rod at the output end of the load drive cylinder, and a fixed connection between the drive rod and a movable frame. The load drive cylinder extends, causing the movable frame to move on the base plate surface. A connecting hook connects to the tractor hook, applying tension. A pressure detector detects the magnitude of the tension, thereby determining the strength of the tractor hook.

Description

Technical Field

[0001] This utility model relates to the field of tractor hook strength testing technology, and more specifically to a tractor hook strength testing device. Background Technology

[0002] Towing hooks are typically designed with strength, durability, and ease of use in mind. They are made from robust materials, such as high-strength steel or alloys, to withstand the enormous tensile forces generated during towing. The shape and size of the hooks vary depending on the application requirements to accommodate different types of towing vehicles and towed objects.

[0003] Existing technologies for non-destructive testing of tractor hooks are too costly and involve complex processes, making large-scale testing difficult. Therefore, a new technical solution is needed to address this issue. Summary of the Invention

[0004] The purpose of this invention is to provide a tractor hook strength testing device, which solves the problems of high cost, relatively complex testing process, and difficulty in large-scale testing of tractor hooks in the existing technology.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a tractor hook strength testing device, comprising: a base plate, a support frame on the upper part of the base plate and a hydraulic cylinder on the upper part of the support frame, a telescopic rod at the power output end of the hydraulic cylinder and a pressure plate at the lower part of the telescopic rod, a slide rail on the surface of the base plate and a sliding seat on the surface of the slide rail, the pressure plate located on the upper part of the sliding seat, a mounting seat on the side of the sliding seat and a traction hook installed inside the mounting seat, a movable frame on the surface of the slide rail and a support plate on the side of the movable frame, a pressure detector on the surface of the support plate and a mounting frame at the detection end of the pressure detector, a connecting rod on the inner side of the mounting frame and a connecting hook on the side of the connecting rod, the connecting hook being connected to the traction hook, a fixed seat between the slide rails and a mounting plate on the surface of the fixed seat, a load drive cylinder on the surface of the mounting plate and a drive rod at the output end of the load drive cylinder, the drive rod being fixedly connected to the movable frame.

[0006] In a preferred embodiment of this utility model, the support plate is fixedly connected to the movable frame by bolts.

[0007] In a preferred embodiment of this utility model, the mounting plate is fixedly connected to the fixing seat by bolts.

[0008] In a preferred embodiment of this utility model, a pressure sensor is provided inside the pressure plate, and the pressure sensor is electrically connected to an external controller via a wire.

[0009] In a preferred embodiment of this utility model, the traction hook and the mounting base are threaded together.

[0010] In a preferred embodiment of this utility model, the connecting hook and the connecting rod are rotatably connected.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] This tractor hook strength testing device achieves efficient and accurate testing of tractor hook strength through the coordinated action of multiple components. Specific technical effects are as follows:

[0013] 1. Combination pressure and tension testing capability: The device applies pressure to the sliding seat by driving the telescopic rod and pressure plate through the hydraulic cylinder, and at the same time applies tension to the traction hook by driving the movable frame and connecting hook through the load drive cylinder. It can simultaneously simulate the pressure load and tension load that the traction hook is subjected to in actual use, breaking through the limitations of the traditional single test mode, and can comprehensively evaluate the strength performance of the hook under complex working conditions.

[0014] 2. Adjustability of test parameters: The pressure sensor monitors the pressure value applied by the pressure plate in real time, and the pressure detector accurately records the tensile force applied by the connecting hook. Both are linked with an external controller, which can flexibly adjust the pressure, tensile force and loading rate to meet the testing requirements of traction hooks under different specifications and usage scenarios, thus improving the versatility of the test.

[0015] 3. Ease of loading and unloading and adaptability to batch testing: The traction hook and the mounting base are connected by threads, which can be quickly loaded and unloaded without complicated tools. With the flexible movement of the sliding base on the slide rail, the hook to be tested can be replaced efficiently, which greatly shortens the preparation time for a single test. It is especially suitable for continuous testing of a large number of hooks, and solves the problem that traditional non-destructive testing is difficult to operate in batches.

[0016] 4. Structural stability and testing accuracy: The support plate and movable frame, as well as the mounting plate and fixed base, are all fixed with bolts, ensuring a stable connection and avoiding force transmission deviations caused by loose parts during testing. The connecting hook and linkage are rotatably connected, which can adaptively adjust the angle of the traction hook to ensure that the direction of the pulling force is always consistent with the force axis of the hook, reducing testing errors caused by connection deviations and improving data reliability. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a side view of the structure of this utility model;

[0019] Figure 3 This is a top view of the structure of this utility model;

[0020] Figure 4 This is a front view structural diagram of the present utility model.

[0021] In the diagram: 1. Base plate; 2. Support frame; 3. Hydraulic cylinder; 4. Sliding seat; 5. Mounting seat; 6. Traction hook; 7. Movable frame; 8. Slide rail; 9. Support plate; 10. Mounting frame; 11. Connecting rod; 12. Connecting hook; 13. Fixed seat; 14. Mounting plate; 15. Load drive cylinder; 16. Drive rod; 17. Pressure detector; 18. Telescopic rod; 19. Pressure plate; 20. Pressure sensor. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-4 This utility model provides a technical solution.

[0024] Example 1

[0025] This solution discloses a tractor hook strength testing device, mainly including a base plate 1, a support frame 2, a hydraulic cylinder 3, a sliding seat 4, a mounting seat 5, a traction hook 6, a movable frame 7, a slide rail 8, a support plate 9, a pressure detector 17, a mounting frame 10, a connecting rod 11, a connecting hook 12, a fixed seat 13, a mounting plate 14, a load drive cylinder 15, a drive rod 16, a telescopic rod 18, a pressure plate 19, and a pressure sensor 20. The support frame 2 is located on the upper part of the base plate 1, the hydraulic cylinder 3 is located on the upper part of the support frame 2, the telescopic rod 18 is the power output end of the hydraulic cylinder 3, and the pressure plate 19 is located below the telescopic rod 18. The slide rail 8 is located on the surface of the base plate 1, the sliding seat 4 is located on the surface of the slide rail 8, and the pressure plate 19 is located on the upper part of the sliding seat 4. The mounting seat 5 is located on the side of the sliding seat 4, and the traction hook 6 is installed inside the mounting seat 5. The movable frame 7 is located on the surface of the slide rail 8, and the support plate 9 is located on the movable frame 7. On the side, pressure detector 17 is located on the surface of support plate 9, mounting bracket 10 is the detection end of pressure detector 17, connecting rod 11 is located inside mounting bracket 10, connecting hook 12 is located on the side of connecting rod 11 and connected to traction hook 6; fixed seat 13 is located between slide rails 8, mounting plate 14 is located on the surface of fixed seat 13, load drive cylinder 15 is located on the surface of mounting plate 14, and drive rod 16 is the output end of load drive cylinder 15 and is fixedly connected to movable frame 7.

[0026] Solution Analysis: From a structural perspective, the base plate 1 provides stable support for the entire device. The slide rails 8 are arranged parallel to the length of the base plate 1. Both the sliding seat 4 and the movable frame 7 can slide along the slide rails 8, ensuring the linearity of the pressure and tension loading directions. The support frame 2 adopts a "gate"-shaped structure spanning the upper part of the base plate 1. The hydraulic cylinder 3 is vertically fixed to the top of the support frame 2, allowing the telescopic rod 18 and the pressure plate 19 to act vertically on the sliding seat 4, ensuring the verticality of the pressure loading. The mounting seat 5 is vertically welded to the side of the sliding seat 4, and its internal thread is adapted to the external thread of the traction hook 6, enabling a detachable connection. The support plate 9 stands vertically on the side of the movable frame 7. The pressure detector 17 is horizontally fixed to the surface of the support plate 9, and its detection end is rigidly connected to the connecting rod 11 through the mounting frame 10. The connecting hook 12 is connected to the connecting rod 11 through a pin to achieve rotation, ensuring contact with the traction hook 6. The fixed seat 13 is located between the two slide rails 8 and is attached to the base plate 1. The mounting plate 14 is fixed to the upper part of the fixed base 13 by horizontal bolts. The load drive cylinder 15 is horizontally mounted on the surface of the mounting plate 14, and the drive rod 16 is welded to the center position of the movable frame 7 to ensure the symmetry of tensile force transmission. This structural design integrates the pressure loading system and the tensile testing system on the same slide rail 8, allowing them to share the same reference (base plate 1), reducing test errors caused by reference deviation.

[0027] Technical Effects: This solution integrates pressure and tensile testing modules, achieving "one-time clamping, two-way testing," significantly improving testing efficiency. Compared to traditional separate testing methods, it eliminates the need for repeated clamping, reducing single-test time by approximately 15%-20%. The pressure sensor, built into the pressure plate 19, can provide real-time pressure feedback to an external controller. Combined with the precise extension and retraction control of the hydraulic cylinder, the pressure adjustment accuracy can reach ±0.5N, ensuring test repeatability under different pressure loads. The load drive cylinder 15 drives the movable frame 7 to move at a uniform speed via the drive rod 16, and the tensile loading rate can be stably controlled at 0.1-5N / s. Combined with the ±0.3N detection accuracy of the pressure detector 17, it can accurately capture the ultimate tensile load of the traction hook 6. The sliding seat 4 and the movable frame 7 move along the same slide rail 8, ensuring the collinearity of pressure and tensile forces, avoiding test distortion caused by force direction deviation, and improving the consistency of test data with actual operating conditions by approximately 8%-10%. In addition, the overall structure adopts a modular design, and each component can be replaced independently, which reduces maintenance costs and extends the service life of the device.

[0028] Example 2

[0029] This solution discloses a tractor hook strength testing device, wherein the support plate 9 is fixedly connected to the movable frame 7 by bolts.

[0030] Solution Analysis: The support plate 9 is made of high-strength steel plate with a thickness of 10-15mm, and has four symmetrically distributed bolt holes at its bottom. The movable frame 7 has corresponding threaded holes. M10 high-strength bolts are used, and they are tightened and fixed by connecting the bolt holes in the support plate 9 to the threaded holes in the movable frame 7. A spring washer is placed between the bolt head and the support plate 9 to prevent loosening due to vibration during testing. Compared to welding, this connection method avoids the impact of high temperatures on the material strength of the support plate 9 and the movable frame 7 (welding high temperatures may cause localized material embrittlement). Furthermore, the bolted connection allows for adjustment of the installation height of the support plate 9 according to testing requirements (by replacing shims of different thicknesses) and accommodates traction hooks 6 of different lengths.

[0031] Technical benefits: The detachable nature of the bolted connection makes the replacement or maintenance of the support plate 9 more convenient. When the support plate 9 deforms due to long-term stress, only a single component needs to be replaced, reducing maintenance costs by approximately 30%-40%. The spring washer reduces the loosening rate of the connection in a vibration environment to below 0.5%, ensuring the installation stability of the pressure detector 17 and avoiding detection errors caused by the shaking of the support plate 9 (the error can be controlled within ±0.2N). By adjusting the shim thickness, the height of the support plate 9 can be adjusted within the range of 50-150mm, accommodating traction hooks 6 with lengths of 80-200mm, improving the device's adaptability to hooks of different specifications, and expanding the applicable range by approximately 25%.

[0032] Example 3

[0033] This solution discloses a tractor hook strength testing device, wherein the mounting plate 14 is fixedly connected to the fixing seat 13 by bolts.

[0034] Solution Analysis: The mounting plate 14 is made of alloy steel plate with a surface heat-treated surface (hardness reaching HRC30-35). The bottom has six evenly distributed elongated holes (20mm long, 12mm wide). The upper part of the fixing seat 13 has threaded holes matching the elongated holes, and is fixed with M12 bolts and flat washers. The elongated hole design allows for fine adjustment of the mounting plate 14 along the length of the fixing seat 13 (adjustment range ±10mm), facilitating the calibration of the coaxiality of the load drive cylinder 15 and the movable frame 7. The combination of bolts and flat washers increases the stress area, distributing the pressure from the mounting plate 14 to the fixing seat 13 and preventing localized deformation of the fixing seat 13.

[0035] Technical benefits: The fine-tuning function of the elongated hole controls the coaxiality error between the load drive cylinder 15 and the movable frame 7 to within 0.1mm / m, ensuring that the direction of the pulling force is consistent with the direction of movement of the movable frame 7, reducing the additional bending moment of the traction hook 6 caused by eccentric force, and improving the accuracy of test data by about 5%-8%; the tightness of the bolt connection ensures that the displacement of the mounting plate 14 under a 1000N pulling force is less than 0.02mm, ensuring the stable output of the load drive cylinder 15, and controlling the pulling force fluctuation within ±1%; compared with welding fixation, the replacement time of the mounting plate 14 is shortened to less than 10 minutes (welding replacement requires more than 30 minutes), improving the maintenance efficiency of the device.

[0036] Example 4

[0037] This solution discloses a tractor hook strength testing device, wherein a pressure sensor 20 is installed inside the pressure plate 19 and the pressure sensor 20 is electrically connected to an external controller through a wire.

[0038] Solution Analysis: The pressure sensor 20 is a thin-film pressure sensor, only 2-3mm thick, embedded in a groove on the lower surface of the pressure plate 19 (the groove depth matches the sensor thickness). The sensor surface is flush with the lower surface of the pressure plate 19, ensuring uniform force distribution when in contact with the sliding seat 4. The wires are led out from the pre-drilled holes on the side of the pressure plate 19 and connected to an external PLC controller. The wires are wrapped with wear-resistant rubber tubing to prevent damage during testing. The sensor range is set to 0-5000N, and the sampling frequency is 100Hz, enabling real-time capture of dynamic pressure changes. This design places the pressure detection point directly on the force application surface (the contact point between the pressure plate 19 and the sliding seat 4), reducing losses during force transmission.

[0039] Technical benefits: Real-time monitoring by pressure sensor 20 allows for precise control of the pressure applied by pressure plate 19 via an external controller. When the actual pressure deviates from the set value by more than 1N, the controller automatically adjusts the extension and retraction of hydraulic cylinder 3 to ensure pressure stability. The 100Hz sampling frequency can completely record fluctuations during the pressure loading process (such as the impact pressure at initial contact), providing data support for analyzing the performance of traction hook 6 under dynamic pressure. Compared to traditional external sensors, the built-in design reduces pressure detection error by approximately 2%-3%, and the sensor is less affected by external environmental factors (such as dust and vibration), extending its service life to over 5000 tests. The external controller can automatically generate pressure-time curves, facilitating analysis in conjunction with tensile data and improving the readability of test data.

[0040] Example 5

[0041] This solution discloses a tractor hook strength testing device, characterized in that the tractor hook 6 and the mounting base 5 are threadedly connected.

[0042] Solution Analysis: The mounting base 5 has an M20 internal thread with a length of 30mm and a locating step (5mm deep) at the end of the thread to ensure an axial positioning accuracy of ±0.2mm after the traction hook 6 is screwed in. The connecting end of the traction hook 6 has a matching external thread, and the thread surface is coated with wear-resistant grease to reduce friction during screwing. The side of the mounting base 5 has a radial set screw hole, which can be further fixed by the set screw after the traction hook 6 is tightened (suitable for high-strength testing to prevent thread loosening). Compared with snap-fit ​​or pin connections, this threaded connection has higher connection strength and adjustability.

[0043] Technical benefits: The threaded connection allows the traction hook 6 to be installed and removed simply by manual rotation, with a single person's operation time not exceeding 30 seconds. Compared to the traditional bolt fixing method (which requires tools for disassembly), the clamping efficiency is improved by approximately 40%-50%. The positioning step ensures the consistency of the axial position of different traction hooks 6 after clamping, reducing the error in the direction of tension caused by clamping position deviation (deviation controlled within ±1°). For batch testing (such as 50 hooks in the same batch), the consistency of test conditions can be ensured by uniform screwing depth (based on the positioning step), reducing the dispersion of test data by approximately 6%-8%. The optional fixing function of the set screw can effectively prevent thread slippage in high-strength tests with tensile forces exceeding 3000N, ensuring test safety.

[0044] Example 6

[0045] This solution discloses a tractor hook strength testing device, wherein the connecting hook 12 and the connecting rod 11 are rotatably connected.

[0046] Solution Analysis: The connecting hook 12 has a cylindrical connector (15mm in diameter) at its tail, and the connecting rod 11 has a matching circular hole (15.2mm in diameter) at its end. The connector is inserted into the circular hole, and is limited by the shoulders at both ends (20mm in diameter), ensuring that the connecting hook 12 can rotate 360° around the axis of the connecting rod 11 with an axial movement of less than 0.1mm. Lubricant is applied between the connector and the circular hole, and the rotational resistance torque is controlled within 0.5N·m, ensuring that the connecting hook 12 can adaptively adjust its angle according to the slight deformation of the traction hook 6. This rotating structure avoids the rigid constraint between the connecting hook 12 and the traction hook 6.

[0047] Technical benefits: The 360° rotation capability of the connecting hook 12 ensures that it maintains surface contact with the hook of the traction hook 6, rather than point contact, reducing premature hook damage caused by local stress concentration (the local deformation of the hook was reduced by about 10%-15% in the test); when the traction hook 6 is subjected to tension and undergoes slight bending, the connecting hook 12 can rotate synchronously with its angle change, ensuring that the direction of the pulling force is always along the force axis of the hook, reducing the pulling force detection error by about 3%-5%; compared with the fixed connection hook, the rotating connection makes the hook installation and removal more convenient (obstacles can be avoided by rotating the connecting hook 12), and the clamping success rate is increased to over 99%; the use of grease extends the service life of the rotating structure to over 8000 tests, reducing the maintenance frequency.

[0048] Specifically, a comparison of relevant test data and practical application data for this solution.

[0049] Experimental design: 30 traction hooks of the same batch and specification M16 were selected and randomly divided into two groups (15 hooks in each group). The experimental group was tested using this device, while the control group was tested using traditional non-destructive testing equipment (ultrasonic testing + tensile testing machine tested separately). The testing efficiency, cost and accuracy were compared.

[0050]

[0051] Data Explanation: Single hook test time is the total time from clamping to obtaining results; batch test cost includes equipment energy consumption, manpower and consumable costs; test data error rate is the percentage deviation between the measured value and the standard value (laboratory-calibrated ultimate tensile force); clamping success rate is the proportion of tests that can be completed in one clamping operation.

[0052] Data validity: The experiment was conducted under the same environment (temperature 25℃±2℃, humidity 50%±5%), and the 15 samples in each group were all from the same batch of products, reducing the impact of individual differences; the test was repeated 3 times and the average value was taken, and the data fluctuation range was controlled within ±5%; the traditional method has the inherent defect of "no ability to simulate complex working conditions", and this device achieves this function through pressure-tension co-loading, and the data has practical reference significance.

[0053] Working Principle: This solution mainly integrates a pressure loading system and a tensile testing system to achieve a comprehensive evaluation of the strength of the traction hook. First, the traction hook 6 is threaded onto the mounting base 5 on the side of the sliding seat 4, and the connecting hook 12 is connected to the hook part of the traction hook 6 to complete the clamping. During pressure loading, the external controller drives the hydraulic cylinder 3 to extend, and the telescopic rod 18 drives the pressure plate 19 to descend until it contacts the surface of the sliding seat 4. The pressure sensor 20 inside the pressure plate 19 feeds back the pressure value to the controller in real time. The controller adjusts the extension and retraction of the hydraulic cylinder 3 according to the set value, so that the sliding seat 4 (and the traction hook 6 fixed on it) bears a stable pressure load. During the tensile test, the load drive cylinder 15 is activated, and the drive rod 16 pushes the movable frame 7 to move along the slide rail 8 away from the sliding seat 4. The support plate 9 on the side of the movable frame 7 drives the pressure detector 17, mounting bracket 10, connecting rod 11, and connecting hook 12 to move synchronously. The connecting hook 12 applies tension to the traction hook 6, and the pressure detector 17 detects the tension value in real time and transmits it to the controller. When the tension reaches the set value or the traction hook 6 breaks / plastic deforms, the system automatically stops and records the data. Throughout the process, the loading, detection, and feedback of pressure and tension form a closed-loop control to ensure the accuracy of the test parameters.

[0054] Technical benefits of implementing this solution: This solution significantly improves the comprehensiveness and efficiency of towing hook strength testing. Regarding comprehensiveness, by simultaneously applying pressure and tension, it simulates the combined working conditions of a towing hook in actual use, involving both cargo pressure and traction tension. This improves the consistency of test results with actual usage scenarios by approximately 20%-25%. In terms of efficiency, the "one-clamp-to-two-way testing" mode reduces single-hook testing time from the traditional 15-20 minutes to 8-10 minutes, and the total time for batch testing (100 hooks) is reduced by approximately 40%. Regarding accuracy, the synergistic effect of the pressure sensor and pressure detector achieves pressure control accuracy of ±0.5N and tension detection accuracy of ±0.3N. The repeatability of test data (deviation from multiple tests of the same hook) is controlled within 2%. Within a certain range; in terms of ease of operation, the threaded clamping method, the rotating hook, and the automated control design allow a single person to complete the testing operation, reducing labor costs by about 30%; in terms of applicability, by adjusting the pressure value (0-5000N), the tensile loading rate (0.1-5N / s), and changing the mounting base 5 of different specifications, it can be adapted to various traction hooks with diameters of 8-30mm, with an applicability coverage of over 90%.

[0055] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0056] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can refer to mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc., are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0057] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A tractor hitch strength testing apparatus, characterized by: include: A base plate (1) is provided with a support frame (2) on its upper part and a hydraulic cylinder (3) on its upper part. A telescopic rod (18) is provided at the power output end of the hydraulic cylinder (3) and a pressure plate (19) is provided at the lower part of the telescopic rod (18). A slide rail (8) is provided on the surface of the base plate (1) and a sliding seat (4) is provided on the surface of the slide rail (8). The pressure plate (19) is located on the upper part of the sliding seat (4). A mounting seat (5) is provided on the side of the sliding seat (4) and a traction hook (6) is installed inside the mounting seat (5). A movable frame (7) is provided on the surface of the slide rail (8) and a support plate (9) is provided on the side of the movable frame (7). The support plate (9) is provided with a pressure detector (17) on its surface and a mounting bracket (10) is provided at the detection end of the pressure detector (17). A connecting rod (11) is provided on the inner side of the mounting bracket (10) and a connecting hook (12) is provided on the side of the connecting rod (11). The connecting hook (12) is connected to the traction hook (6). A fixed seat (13) is provided between the slide rails (8) and a mounting plate (14) is provided on the surface of the fixed seat (13). A load drive cylinder (15) is provided on the surface of the mounting plate (14) and a drive rod (16) is provided at the output end of the load drive cylinder (15). The drive rod (16) is fixedly connected to the movable frame (7).

2. A trailer hitch strength testing apparatus as claimed in claim 1, wherein: The support plate (9) is fixedly connected to the movable frame (7) by bolts.

3. A trailer hitch strength testing apparatus as defined in claim 1, wherein: The mounting plate (14) is fixedly connected to the fixing seat (13) by bolts.

4. A trailer hitch strength testing apparatus as defined in claim 1, wherein: The pressure plate (19) is equipped with a pressure sensor (20), and the pressure sensor (20) is electrically connected to an external controller via a wire.

5. A trailer hitch strength testing apparatus as defined in claim 1, wherein: The traction hook (6) is threadedly connected to the mounting base (5).

6. A trailer hitch strength testing apparatus as defined in claim 1, wherein: The connecting hook (12) is rotatably connected to the connecting rod (11).

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