Step pedal fatigue test tool

Abstract

The utility model relates to the technical field of material testing and mechanical engineering, and discloses a step pedal fatigue test tool which comprises a torsion support, a clamping assembly is arranged on the top of the torsion support, and the clamping assembly is used for guaranteeing the stability of a step in the testing process and guaranteeing accurate application of torsion force. A steel replacement wheel is arranged at the top of the torsion support, a first rotating shaft is arranged at the top of the torsion support, the periphery of a first inner hexagon screw is in threaded connection with a hexagon socket cap screw, and the first inner hexagon screw is slidably connected into the first rotating shaft. According to the utility model, the steel rollers with the same size are adopted and the low-friction movement of the steel rollers is ensured, so that the influence of roller deformation on the test precision is reduced, the accuracy of the test result is improved, the rollers can be prevented from being lifted in the test by locking the clamp and adjusting the compression screw, and the reliability and consistency of the test are ensured.

Description

Technical Field

[0001] The utility model relates to the technical fields of material testing and mechanical engineering, and particularly relates to a tooling for fatigue testing of step pedals. Background Art

[0002] The step pedal is an important component for constructing stairs or ladders. It is the surface of each step or rung of the stairs, providing support for people's feet when going up and down the stairs. The tooling for fatigue testing of step pedals is mainly used to test the durability and reliability of step pedals during repeated use;

[0003] The tooling for fatigue testing of step pedals mainly includes a test platform, a load application device, and a motion system. The test platform is used to install the step pedal to be tested. The load application device can apply and control the load. The motion system can repeatedly apply pressure to simulate the long-term use process;

[0004] The rollers of the existing tooling for fatigue testing of step pedals are prone to deformation, thus affecting the accuracy of test results and unable to maintain the same test conditions in multiple tests, resulting in poor reliability and reproducibility. For this reason, a tooling for fatigue testing of step pedals is proposed to solve the above problems. Summary of the Utility Model

[0005] In order to make up for the above deficiencies, the utility model provides a tooling for fatigue testing of step pedals, aiming to improve the problems of easy deformation of rollers in the existing technology, resulting in poor reliability and reproducibility.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] A tooling for fatigue testing of step pedals includes a torsion bracket. A clamping assembly is arranged at the top of the torsion bracket. The clamping assembly is used to ensure the stability of the step during the test, ensure the accurate application of the torsional force, and thus improve the reliability and consistency of the test. A steel replacement wheel is arranged at the top of the torsion bracket. A first rotating shaft is arranged at the top of the torsion bracket. An internal hexagonal screw is slidably connected inside the first rotating shaft. An internal hexagonal socket head screw is threadedly connected to the outer periphery of the internal hexagonal screw. A positioning block is slidably connected to the bottom of the first rotating shaft. The positioning block is internally threadedly connected to the outer periphery of the internal hexagonal socket head screw;

[0008] As a further description of the above technical solution:

[0009] The clamping assembly includes a locking clamp. A pressing screw is threadedly connected inside the locking clamp. A pressing block is threadedly connected to the bottom of the pressing screw. A second retaining ring is fixedly connected to the top of the pressing block;

[0010] As a further description of the above technical solution:

[0011] One side of the rotating shaft is slidably connected with an internal hexagon socket head cap screw;

[0012] As a further description of the above technical solution:

[0013] One side of the internal hexagon socket head cap screw is fixedly connected with a washer, and the outer circumference of the washer is slidably connected inside the rotating shaft;

[0014] As a further description of the above technical solution:

[0015] T-slot bolts are threadedly connected to both the left and right sides inside the torsion bracket, and a rotating shaft two is rotatably connected to the top of the torsion bracket;

[0016] As a further description of the above technical solution:

[0017] An internal hexagon screw two is provided at the top of the torsion bracket;

[0018] As a further description of the above technical solution:

[0019] One side of the bottom of the rotating shaft is fixedly connected with a retaining ring one, and the retaining ring one is arranged at the bottom of the internal hexagon socket head cap screw;

[0020] As a further description of the above technical solution:

[0021] The retaining ring two is arranged at the bottom of the locking clamp, and the pressing block is arranged at the bottom of the locking clamp.

[0022] The utility model has the following beneficial effects:

[0023] 1. In the utility model, by using steel rollers with the same size to replace other rollers and ensuring that the rollers can move along the supporting surface with low friction, the influence of roller deformation on the test accuracy is effectively reduced, which can ensure more accurate test results and avoid errors caused by the deformation of the roller material.

[0024] 2. In the utility model, by setting the locking clamp device and adjusting the compression screw to make the gap between the pressing block and the roller less than 0.2 mm, the step chain roller can be effectively prevented from being accidentally lifted during the test, which helps to ensure the stability of the step during the test, ensure the accurate application of the torsional force, and thus improve the reliability and consistency of the test. Description of the Drawings

[0025] Figure 1 Is a three-dimensional schematic diagram of a tool for step tread fatigue test proposed by the utility model;

[0026] Figure 2Schematic diagram of the positioning block of a tooling for fatigue test of step pedals proposed by the present utility model;

[0027] Figure 3 Schematic diagram of the locking clamp of a tooling for fatigue test of step pedals proposed by the present utility model;

[0028] Figure 4 Schematic diagram of the second rotating shaft of a tooling for fatigue test of step pedals proposed by the present utility model;

[0029] Figure 5 Schematic diagram of the second hexagon socket head screw of a tooling for fatigue test of step pedals proposed by the present utility model.

[0030] Legend description:

[0031] 1. Torsion bracket; 2. First rotating shaft; 3. First hexagon socket head screw; 4. Positioning block; 5. Washer; 6. Hexagon socket head cap screw; 7. First retaining ring; 8. Compression screw; 9. Locking clamp; 10. Second retaining ring; 11. Pressure block; 12. Second hexagon socket head screw; 13. Second rotating shaft; 14. Steel substitute wheel; 15. T-slot bolt. Specific implementation manners

[0032] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0033] Refer to Figure 1 - Figure 3, an embodiment provided by the present utility model: a fixture for fatigue test of step pedals, including a torsion bracket 1. The torsion bracket 1 is the basic support part of the entire test device, used to support and fix other components. By being fixed to the workbench, it provides a stable foundation. Its inclined design can better simulate the stress state of the steps during actual operation. At the top of the torsion bracket 1, there is a steel substitute wheel 14. At the top of the torsion bracket 1, there is a first rotating shaft 2. The first rotating shaft 2 is used to connect the roller and the positioning block 4 and allows the roller to rotate freely when a load is applied. It is a key component for realizing rotational motion in the test device, ensuring that the torsional force is correctly applied and transmitted on the roller. Inside the first rotating shaft 2, there is a hexagon socket head screw 3 slidingly connected. The hexagon socket head screw 3 is used to fix the first rotating shaft 2 and the positioning block 4 to ensure that the first rotating shaft 2 will not loosen or displace during the test. This screw can provide reliable fastening and ensure the stability of the entire structure. Threaded on the outer periphery of the hexagon socket head screw 3 is a hexagon socket head cap screw 6. The hexagon socket head cap screw 6 can fix the positioning block 4 and other components to ensure the fastening and stability of each component in the device. Its cylindrical head design provides a larger contact surface to ensure the firmness of the connection. At the bottom of the first rotating shaft 2, there is a positioning block 4 slidingly connected. The positioning block 4 is internally threaded on the outer periphery of the hexagon socket head cap screw 6.

[0034] Refer to Figure 1 - Figure 3 , at the top of the torsion bracket 1, there is a clamping component. The clamping component is used to ensure the stability of the step during the test, ensure the accurate application of the torsional force, and thus improve the reliability and consistency of the test. The clamping component includes a locking clamp 9. The locking clamp 9 is used to fix the step roller to prevent the step from being lifted or accidentally moving during the test. It is adjusted by a compression screw 8 to ensure the accuracy and reliability of clamping. It is an important component for maintaining the stability of the step. Threaded inside the locking clamp 9 is a compression screw 8. The compression screw 8 is used to adjust the clamping force of the clamp. By adjusting the compression degree of the screw, the gap between the pressing block 11 and the roller is controlled to ensure that the clamping force is appropriate and prevent the step from being accidentally lifted or displaced during the test. Threaded at the bottom of the compression screw 8 is a pressing block 11. The pressing block 11 contacts the step through the clamp system to ensure that the step is not lifted or moved during the test. The gap between it and the roller is less than 0.2 mm, which can apply an appropriate pressure to the step to ensure that the force applied during the test meets the preset standard. Fixedly connected to the top of the pressing block 11 is a second retaining ring 10. The second retaining ring 10 is used to limit the axial movement of the pressing block 11 to ensure that the components of the clamping system will not have axial displacement. It ensures that the pressing block 11 can move within an appropriate range and provides additional structural stability.

[0035] Refer to Figure 1 、 Figure 4 and Figure 5, on one side of the first rotating shaft 2, there is a sliding connection with an internal hexagon socket head cap screw 6. On one side of the internal hexagon socket head cap screw 6, there is a fixed connection with a washer 5. The outer circumference of the washer 5 is slidably connected inside the first rotating shaft 2. On both the left and right sides inside the torsion bracket 1, there are threaded connections with bolts for T-slots 15. The bolts for T-slots 15 are used to fix the torsion bracket 1 to the workbench. The T-slot design enables this bolt to move and be fixed conveniently in the T-slot of the workbench, facilitating the adjustment and positioning of the device. At the top of the torsion bracket 1, there is a rotational connection with a second rotating shaft 13. At the top of the torsion bracket 1, there is an internal hexagon screw 12. The internal hexagon screw 12 is used to fix the second rotating shaft 13 and related support components. This screw provides a greater torque transmission capacity through its internal hexagon design, ensuring that the components remain fastened under high loads. At the bottom of one side of the first rotating shaft 2, there is a fixed connection with a first retaining ring 7. The first retaining ring 7 is used to limit the axial movement of the first rotating shaft 2, ensuring that the rotating shaft does not undergo axial displacement during rotation. It plays a role in stabilizing the movement of the rotating shaft, guaranteeing the stability of the force transmission direction during the test. The first retaining ring 7 is arranged at the bottom of the internal hexagon socket head cap screw 6. The second retaining ring 10 is arranged at the bottom of the locking clamp 9. The pressing block 11 is arranged at the bottom of the locking clamp 9.

[0036] Working principle: Before the test, first fix the torsion bracket 1 on the workbench, and then place the step on the test fixture. The step, the roller, and the through shaft are tested together. In order to reduce the influence of roller deformation, all the rollers supporting the step are replaced with steel rollers of the same size. In addition, the supporting follower rollers should be able to move with low friction along the supporting surface. Additionally, by adjusting the lateral position of the positioning block 4, lateral movement can be achieved. To prevent the step chain roller from being lifted upwards, there is a locking clamp 9 parallel to the supporting surface. By adjusting the compression screw 8, the gap between the pressing block 11 and the roller is made less than 0.2 mm. In order to twist the step or the tread, one of the follower rollers should not be supported or removed. In addition, the center of this follower roller should be able to displace along an arc of ±2 mm centered on the center of the step chain roller. This ±2 mm displacement is based on a center distance of 400 mm between the follower roller and the step chain roller. The dynamic load is vertically applied to the tread surface through a steel backing plate. The steel backing plate should be placed in the center of the tread according to the regulations.

[0037] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An industrial fixture for the fatigue test of a step tread, comprising a torsion bracket (1), characterized in that: A clamping component is provided at the top of the torsion bracket (1). The clamping component is used to ensure the stability of the step during the test, ensure the accurate application of the torsional force, and thus improve the reliability and consistency of the test. A steel substitute wheel (14) is provided at the top of the torsion bracket (1). A first rotating shaft (2) is provided at the top of the torsion bracket (1). A hex socket head screw (3) is slidably connected inside the first rotating shaft (2). A hex socket cap screw (6) is threadedly connected to the outer periphery of the hex socket head screw (3). A positioning block (4) is slidably connected to the bottom of the first rotating shaft (2). The positioning block (4) is internally threaded to the outer periphery of the hex socket cap screw (6).

2. The fixture for the fatigue test of the step pedal according to claim 1, wherein: The clamping component includes a locking clamp (9). A compression screw (8) is threadedly connected inside the locking clamp (9). A pressing block (11) is threadedly connected to the bottom of the compression screw (8). A second retaining ring (10) is fixedly connected to the top of the pressing block (11).

3. The fixture for the fatigue test of the step pedal according to claim 1, wherein: A hex socket cap screw (6) is slidably connected to one side of the first rotating shaft (2).

4. The fixture for the fatigue test of a step pedal according to claim 3, wherein: A washer (5) is fixedly connected to one side of the hex socket cap screw (6). The outer periphery of the washer (5) is slidably connected inside the first rotating shaft (2).

5. The fixture for the fatigue test of a step pedal according to claim 1, characterized in that: T-slot bolts (15) are threadedly connected to both the left and right sides inside the torsion bracket (1). A second rotating shaft (13) is rotatably connected to the top of the torsion bracket (1).

6. The fixture for the fatigue test of the step tread according to claim 1, wherein: A second hex socket head screw (12) is provided at the top of the torsion bracket (1).

7. The tooling for the fatigue test of a step pedal according to claim 1, characterized in that: A first retaining ring (7) is fixedly connected to the bottom of one side of the first rotating shaft (2). The first retaining ring (7) is provided at the bottom of the hex socket cap screw (6).

8. The fixture for the fatigue test of the step tread according to claim 2, characterized in that: The second retaining ring (10) is provided at the bottom of the locking clamp (9). The pressing block (11) is provided at the bottom of the locking clamp (9).

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