A durable test tool for a trailer hook

Abstract

The utility model provides a kind of trailer hook endurance test tool, including center connecting block and connecting support.Center connecting block can be connected with trailer hook sample;Three groups of connecting supports are provided in the periphery of center connecting block, and the telescopic ends of three groups of hydraulic cylinders arranged along X, Y, Z direction in hydraulic cylinder loading mechanism are connected correspondingly;Among them, X, Y, Z direction is perpendicular to each other.Triple hydraulic cylinders in the driving hydraulic cylinder loading mechanism can be retracted to make trailer hook sample bear longitudinal, transverse and vertical compound load simultaneously, can more truly reflect the stress state under actual road working condition, compared with traditional single axle or step loading mode, three-way endurance test can be completed at one time, debugging time is effectively reduced, loading accuracy and repeatability are guaranteed, test efficiency and result accuracy are greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of trailer hook testing technology, specifically to a trailer hook durability testing fixture. Background Technology

[0002] As a crucial component on a vehicle used for towing trailers, the trailer hitch's structural strength and connection reliability directly affect the vehicle's safety and durability. To verify the mechanical performance of the trailer hitch during long-term use, durability tests are typically conducted to simulate the tensile, compressive, and torsional loads experienced by the vehicle under different operating conditions.

[0003] Most existing trailer hook durability testing equipment uses unidirectional or bidirectional loading methods. A common practice is to apply alternating loads to the trailer hook in a single or dual-axis direction using hydraulic cylinders to simulate longitudinal tension / compression or vertical vibration conditions. However, for complex stress conditions with superimposed three-axis loads, multiple separate tests are often required. This involves first performing a durability test in the X-axis direction, then changing the clamping method to perform tests in the Y-axis or Z-axis directions, which is time-consuming and reduces testing efficiency. Therefore, to address these technical problems, a trailer hook durability testing fixture is proposed. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention proposes a trailer hook durability testing fixture that can complete a three-dimensional durability test in one go, greatly improving testing efficiency and the accuracy of results.

[0005] A durability testing fixture for trailer hooks includes: The central connecting block can be connected to the trailer hook sample; and The connecting brackets are provided around the central connecting block with three sets of connecting brackets. The three sets of connecting brackets are respectively connected to the telescopic ends of the three sets of hydraulic cylinders arranged along the X, Y, and Z directions in the hydraulic cylinder loading mechanism; wherein, the X, Y, and Z directions are perpendicular to each other.

[0006] The beneficial effects of the above-mentioned trailer hook durability testing fixture are as follows: By driving the three sets of hydraulic cylinders in the hydraulic cylinder loading mechanism to retract, the trailer hook sample can be subjected to longitudinal, lateral and vertical composite loads at the same time, which can more realistically reflect the stress state under actual road conditions. Compared with the traditional single-axis or step loading method, this application can complete the three-dimensional durability test at one time, effectively reducing the debugging time, ensuring loading accuracy and repeatability, and greatly improving the testing efficiency and the accuracy of the results.

[0007] In one embodiment, the central connecting block further includes a fastening block, which can be connected to the central connecting block and clamp the trailer hook sample. The clamping action between the fastening block and the central connecting block allows for convenient and quick connection or disconnection of the trailer hook sample.

[0008] In one embodiment, both the fastening block and the central connecting block are provided with snap-fit ​​semi-grooves. The two sets of snap-fit ​​semi-grooves can cooperate to form a snap-fit ​​groove. One end of the trailer hook sample is provided with a snap-fit ​​part, which can be snapped into the snap-fit ​​groove. The snap-fit ​​groove structure formed by the cooperation of the snap-fit ​​semi-grooves facilitates the positioning of the snap-fit ​​part of the trailer hook sample during fixation, and facilitates subsequent clamping and fixing operations.

[0009] In one embodiment, the inner wall of the snap-fit ​​groove is fitted to the outer surface of the snap-fit ​​portion. This design, where the inner wall of the snap-fit ​​groove is fitted to the outer surface of the snap-fit ​​portion, maximizes the contact area to achieve uniform load transfer, avoids localized stress concentration, protects the trailer hook specimen from damage, and ensures that the loading force is applied accurately to the entire trailer hook specimen, thus ensuring that the test data accurately reflects its actual stress performance.

[0010] In one embodiment, the connecting bracket includes a fixing block and a connecting rod; the fixing block is detachably connected to the central connecting block, the connecting rod is disposed on the fixing block, and the telescopic end of the hydraulic cylinder can be sleeved on the connecting rod. The detachable design of the fixing block facilitates the disassembly, maintenance, and replacement of the connecting bracket, reducing operating costs. The connecting rod provides stable sleeve support for the telescopic end of the hydraulic cylinder, ensuring the reliability of the connection during loading.

[0011] In one embodiment, two sets of fixing plates are spaced apart on the fixing block, and the connecting rod is mounted on the two sets of fixing plates. The telescopic end of the hydraulic cylinder is sleeved on the connecting rod and located between the two sets of fixing plates. The spacing between the two sets of fixing plates provides limiting support for the telescopic end of the hydraulic cylinder, limiting its installation position and dispersing the lateral force generated during loading, thus preventing the telescopic end of the hydraulic cylinder from tilting or swaying during loading.

[0012] In one embodiment, force sensors are installed on the extension and retraction ends of all three sets of hydraulic cylinders to detect the loading force in each axis.

[0013] In one embodiment, displacement sensors are installed on the extension and retraction ends of all three sets of hydraulic cylinders to detect displacement in each axial direction. Attached Figure Description

[0014] To more clearly illustrate the specific embodiments of this utility model, the accompanying drawings used in the specific embodiments will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to scale.

[0015] Figure 1 A three-dimensional structural schematic diagram of a trailer hook durability testing fixture provided in an embodiment of this utility model; Figure 2 for Figure 1 The image shown is an exploded view of a trailer hook durability testing fixture.

[0016] Figure label: 10. Center connecting block; 101. Fastening block; 102. Snap-fit ​​half-groove; 20. Connecting bracket; 201. Fixing block; 202. Connecting rod; 203. Fixing plate. Detailed Implementation

[0017] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0018] Please see Figure 1 One embodiment of a trailer hitch durability testing fixture includes a central connecting block 10 and connecting brackets 20. The central connecting block 10 can connect to a trailer hitch sample. Three sets of connecting brackets 20 are arranged around the central connecting block 10, and these three sets of connecting brackets 20 are respectively connected to the telescopic ends of three sets of hydraulic cylinders arranged along the X, Y, and Z directions in the hydraulic cylinder loading mechanism; wherein the X, Y, and Z directions are mutually perpendicular. It is understood that the X-axis hydraulic cylinder simulates the longitudinal tensile and compressive loads of the vehicle, the Y-axis hydraulic cylinder simulates the lateral loads, and the Z-axis hydraulic cylinder simulates the vertical loads.

[0019] By driving the three sets of hydraulic cylinders in the hydraulic cylinder loading mechanism to retract, the trailer hook sample can be subjected to longitudinal, lateral and vertical composite loads at the same time, which can more realistically reflect the stress state under actual road conditions. Compared with the traditional single-axis or step loading method, this application can complete the three-dimensional durability test at one time, effectively reducing the debugging time, ensuring loading accuracy and repeatability, and greatly improving the testing efficiency and the accuracy of the results.

[0020] Specifically, in the above embodiments, force sensors are installed on the extension and retraction ends of all three sets of hydraulic cylinders. Displacement sensors are also installed on the extension and retraction ends of all three sets of hydraulic cylinders. It can be understood that by setting force and displacement sensors, the loading force and displacement in each axis are detected, achieving independent control and synchronous coordination of the three axes. By setting different loading waveforms in the control system, synchronous and durable loading of the three axes can be achieved.

[0021] Please see Figure 1In one embodiment, the central connecting block 10 further includes a fastening block 101, which can be connected to the central connecting block 10 and clamp the trailer hook sample. The clamping and connection of the trailer hook sample by the fastening block 101 and the central connecting block 10 makes it convenient and quick to connect or disconnect the trailer hook sample. Specifically, the fastening block 101 and the central connecting block 10 are fixed by bolts.

[0022] Please see Figure 2 In one embodiment, both the fastening block 101 and the central connecting block 10 are provided with snap-fit ​​half-grooves 102. The two sets of snap-fit ​​half-grooves 102 can cooperate to form a snap-fit ​​groove. One end of the trailer hook sample is provided with a snap-fit ​​part, which can be snapped into the snap-fit ​​groove. The snap-fit ​​groove structure formed by the cooperation of the snap-fit ​​half-grooves 102 facilitates the positioning of the snap-fit ​​part of the trailer hook sample during fixation, and facilitates subsequent clamping and fixing operations.

[0023] Based on the above embodiments, the inner wall of the snap-fit ​​groove is further fitted to the outer surface of the snap-fit ​​part. This design, where the inner wall of the snap-fit ​​groove is fitted to the outer surface of the snap-fit ​​part, maximizes the contact area to achieve uniform load transfer, avoids local stress concentration, protects the trailer hook sample from damage, and ensures that the loading force is applied to the entire trailer hook sample, thus ensuring that the test data accurately reflects its actual stress performance.

[0024] Please see Figure 1 In one embodiment, the connecting bracket 20 includes a fixing block 201 and a connecting rod 202. The fixing block 201 is detachably connected to the central connecting block 10, and the connecting rod 202 is mounted on the fixing block 201, allowing the telescopic end of the hydraulic cylinder to be fitted onto the connecting rod 202. Specifically, the fixing block 201 and the central connecting block 10 are fixedly connected by bolts. The detachable design of the fixing block 201 facilitates the disassembly, maintenance, and replacement of the connecting bracket 20, reducing operating costs. The connecting rod 202 provides stable support for the telescopic end of the hydraulic cylinder, ensuring reliable connection during loading.

[0025] Based on the above embodiments, further, two sets of fixing plates 203 are spaced apart on the fixing block 201, and the connecting rod 202 is disposed on the two sets of fixing plates 203. The telescopic end of the hydraulic cylinder is sleeved on the connecting rod 202 and located between the two sets of fixing plates 203. The spacing between the two sets of fixing plates 203 provides limiting support for the telescopic end of the hydraulic cylinder, limiting its installation position while dispersing the lateral force generated during loading, thus preventing the telescopic end of the hydraulic cylinder from tilting or shaking during loading.

[0026] The specific implementation method of the above-mentioned trailer hook durability testing fixture is as follows: The test preparation is completed by placing the trailer hook sample clamping part into the clamping half groove 102, and then installing the fastening block 101 on the central connecting block 10 with bolts to clamp the trailer hook sample. Then, the extension and retraction ends of the three sets of hydraulic cylinders are respectively connected to the connecting rods 202 in the three sets of connecting brackets 20. Finally, by driving the three sets of hydraulic cylinders in the hydraulic cylinder loading mechanism to retract, the trailer hook sample can simultaneously bear the longitudinal, lateral and vertical composite loads, which can more realistically reflect the stress state under actual road conditions. Compared with the traditional single-axis or step loading method, this application can complete the three-dimensional durability test at one time, effectively reducing the debugging time, ensuring loading accuracy and repeatability, and greatly improving the test efficiency and the accuracy of the results.

[0027] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A durability testing fixture for trailer hooks, characterized in that, include: The central connecting block (10) can be connected to the trailer hook sample; and The connecting bracket (20) is provided with three sets of the connecting bracket (20) around the central connecting block (10). The three sets of the connecting bracket (20) are respectively connected to the telescopic ends of the three sets of hydraulic cylinders arranged along the X, Y and Z directions in the hydraulic cylinder loading mechanism; wherein, the X, Y and Z directions are perpendicular to each other.

2. The trailer hook durability testing fixture according to claim 1, characterized in that, The central connecting block (10) also includes a fastening block (101), which can be connected to the central connecting block (10) and clamp the trailer hook sample.

3. The trailer hook durability testing fixture according to claim 2, characterized in that, Both the fastening block (101) and the central connecting block (10) are provided with snap-fit ​​half-grooves (102). The two sets of snap-fit ​​half-grooves (102) can cooperate to form a snap-fit ​​groove. One end of the trailer hook sample is provided with a snap-fit ​​part, which can be snapped into the snap-fit ​​groove.

4. The trailer hook durability testing fixture according to claim 3, characterized in that, The inner wall of the snap-fit ​​groove is in contact with the outer surface of the snap-fit ​​part.

5. The trailer hook durability testing fixture according to claim 1, characterized in that, The connecting bracket (20) includes a fixing block (201) and a connecting rod (202); the fixing block (201) is detachably connected to the central connecting block (10), the connecting rod (202) is disposed on the fixing block (201), and the telescopic end of the hydraulic cylinder can be sleeved on the connecting rod (202).

6. The trailer hook durability testing fixture according to claim 5, characterized in that, Two sets of fixing plates (203) are spaced apart on the fixing block (201). The connecting rod (202) is set on the two sets of fixing plates (203). The telescopic end of the hydraulic cylinder is sleeved on the connecting rod (202) and located between the two sets of fixing plates (203).

7. The trailer hook durability testing fixture according to claim 1, characterized in that, Force sensors are installed on the extension and retraction ends of all three sets of hydraulic cylinders.

8. The trailer hook durability testing fixture according to claim 1, characterized in that, Displacement sensors are installed on the telescopic ends of all three sets of hydraulic cylinders.

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