A spring stress relaxation performance testing device

Abstract

The utility model belongs to the field of mechanical structure design, and relates to a spring stress relaxation performance testing device, which comprises a top seat, a spring pressure plate and a base arranged in sequence from top to bottom, four guide rods are fixedly installed between the top seat and the base, the spring pressure plate is sleeved on the four guide rods and moves up and down along the guide rods, a plurality of cylindrical spring guide rods and special-shaped spring guide rods for installing the spring to be measured are arranged between the spring pressure plate and the base, and a pressure sensor measurement unit is installed on each of the cylindrical spring guide rods and the special-shaped spring guide rods; the top seat is provided with a through hole for installing a rotating assembly, the rotating assembly is composed of a rotating disc and a main threaded guide rod which are fixedly connected, the main threaded guide rod penetrates through the spring pressure plate and is threadedly connected with the spring pressure plate, and the spring pressure plate moves up and down by rotating the main threaded guide rod. The device can be used to test the performance of different types, styles and specifications of springs and the same specification of springs with different deformation amounts at a specified temperature, is simple to operate, can realize continuous testing, and has accurate test results.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical structure design, and relates to the performance testing and experimentation of spring structures, specifically to a spring stress relaxation performance testing device. Background Technology

[0002] Existing devices for obtaining spring stress relaxation performance, such as universal testing machines, test the mechanical properties of springs before temperature cycling. First, a fixture is used to pre-compress the spring to a specified deformation. The pre-compressed spring is then placed in a high-low temperature cycling chamber for cyclic testing. After a period of time, the spring is removed, cooled, or restored to room temperature, and then disassembled from the fixture. The universal testing machine is then used to test the spring's mechanical properties. This process is repeated multiple times to obtain the trend of the spring's mechanical properties after high-low temperature cycling, which represents the spring's stress relaxation performance.

[0003] However, this experimental procedure is numerous and complex, and the operation is cumbersome. When using existing equipment, obtaining spring mechanical performance data requires repeatedly removing the sample from the high and low temperature cycling chamber for testing each time. This process is repeated to obtain several sets of data to determine the trend of spring stress relaxation performance. This results in a very limited number of data points, and the finiteness of the data leads to a large deviation between the fitted data trend and the actual performance. Furthermore, the experiment requires repeatedly removing, disassembling, testing, deforming, and cycling the spring in temperature cycles, dynamically acquiring the spring mechanical performance parameters at different temperature cycles. This results in deviations in deformation after each re-deformation, and the sample returning to room temperature also has a microscopic impact on product performance, making it difficult to guarantee the accuracy of the obtained experimental data, thus leading to a deviation between the tested performance and the actual performance. Moreover, because the sample needs to be removed, returned to room temperature, and disassembled before testing the spring's mechanical performance, parameters at a specified temperature cannot be tested.

[0004] Furthermore, existing spring stress relaxation performance testing devices are limited by their structure, making it impossible to simultaneously test the stress relaxation performance of springs of different types, styles, and specifications; nor can they simultaneously test the stress relaxation performance of springs of the same specification with different deformation amounts. To address these issues with existing spring stress relaxation performance testing devices, there is an urgent need to develop a fully functional testing fixture that can guarantee measurement accuracy. Utility Model Content

[0005] The purpose of this invention is to solve the above-mentioned problems in the prior art and to propose a spring stress relaxation performance testing device. This device can be used to test the stress relaxation performance of springs of different types, styles and specifications, as well as springs of the same specification with different deformation amounts, at a specified temperature. It is simple to operate, can perform continuous testing, and the test results are accurate.

[0006] The technical solution of this utility model is:

[0007] This utility model provides a spring stress relaxation performance testing device, including a top seat, a spring pressure plate and a base arranged sequentially from top to bottom. Four guide rods are fixedly installed between the top seat and the base. The spring pressure plate is sleeved on the four guide rods and can move up and down along the guide rods. Several cylindrical spring guide rods and irregular spring guide rods for installing the spring to be tested are arranged between the spring pressure plate and the base. Pressure sensor measuring units are installed on the cylindrical spring guide rods and irregular spring guide rods.

[0008] The top seat has a through hole for installing a rotating assembly. The rotating assembly consists of a turntable and a main threaded guide rod that are fixedly connected. The main threaded guide rod passes through the spring pressure plate and is threadedly connected to the spring pressure plate. The spring pressure plate is moved up and down by rotating the main threaded guide rod.

[0009] Furthermore, several pairs of spring hooks are provided between the spring pressure plate and the base. The spring hooks are symmetrically installed on the lower end face of the spring pressure plate and the upper end face of the base, respectively, for installing the spring to be tested and the tension sensor.

[0010] Furthermore, the pressure sensor measurement unit includes a hollow threaded rod, gaskets installed at both ends of the hollow threaded rod, and a thin-film pressure sensor. The gaskets are threadedly connected to the hollow threaded rod and can rotate along the thread of the hollow threaded rod to adjust their own position.

[0011] Furthermore, the hollow threaded rod is sleeved on a cylindrical spring guide rod or a non-circular spring guide rod, and a thin-film pressure sensor is provided on the side of the gasket that contacts the spring pressure plate.

[0012] Furthermore, the spring pressure plate is provided with several through holes for the spring guide rod to pass through; the lower part of the cylindrical spring guide rod is fixed to the base by a threaded connection, and its upper part passes through the through hole and is not connected to the top seat; the lower part of the irregular spring guide rod is fixed to the base by a threaded connection, and its upper part passes through the through hole and is not connected to the top seat.

[0013] Furthermore, the turntable is equipped with a handle. By rotating the turntable with the handle, the main thread guide rod rotates together with the turntable, thereby driving the spring pressure plate to move up and down along the thread of the main thread guide rod.

[0014] Furthermore, the top seat, spring pressure plate, and base are identical in shape and size, and are either square or round.

[0015] The beneficial effects of this utility model are:

[0016] (1) The spring stress relaxation performance test device provided by this utility model can read the spring mechanical performance parameters by pressing the spring into place. The device and the spring sample can be placed in a high and low temperature cycle chamber. Data can be read at any time using a high-precision thin film pressure sensor. There is no need to repeatedly disassemble and assemble. The method is simple and easy to operate.

[0017] (2) Abundant data acquisition: This device can simultaneously acquire data on sample deformation, temperature cycling, and spring mechanical properties. It can obtain far more data than existing test devices according to needs, and can more accurately reflect the stress relaxation performance trend of the sample.

[0018] (3) The data obtained is highly accurate, and the device parameters can be precisely controlled. The sample does not need to be removed during the test, nor does the device need to be disassembled. The mechanical performance data of the spring can be accurately measured through the high-precision thin-film pressure sensor, and the mechanical performance data of the spring at the specified temperature can be obtained at any time.

[0019] (4) The device can simultaneously test the deformation of multi-station springs, such as springs with different deformation (or compression), with precise variable control and accurate testing of spring mechanical performance data. Furthermore, the device can not only test multiple sets of springs of the same structure at the same time, but also achieve simultaneous testing of stress relaxation performance of springs of different types, styles, and specifications (including springs with different inner diameters, wire diameters, or non-cylindrical irregular shapes) through the independent design of each station in the device, which greatly improves the testing efficiency. Attached Figure Description

[0020] Figure 1 A schematic diagram of the spring stress relaxation performance testing device provided by this utility model;

[0021] Figure 2 This is a schematic diagram of the structure of a cylindrical spring guide rod;

[0022] Figure 3 This is a schematic diagram of the structure of an irregularly shaped spring guide rod;

[0023] Figure 4 This is a partial structural diagram of the pressure sensor measurement unit.

[0024] Figure 5 A schematic diagram of a device with a compression spring installed.

[0025] Figure 6 A schematic diagram of a device with a tension spring installed.

[0026] In the above figures, 1. Base; 2. Guide rod; 3. Cylindrical spring guide rod; 4. Pressure sensor measuring unit; 4-1. Gasket; 4-2. Hollow threaded rod; 5. Spring pressure plate; 6. Top seat; 7. Turntable; 8. Main threaded guide rod; 9. Special-shaped spring guide rod; 10. Tension spring; 11. Tension sensor; 12. Compression spring. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0028] In the description of this utility model, it should be noted that the terms "upper", "lower", "both ends", "upper part", "lower part", etc., indicate the orientation or positional relationship based on the positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] like Figure 1 As shown, this utility model relates to a spring stress relaxation performance testing device. The device includes a top seat 6, a spring pressure plate 5, and a base 1 arranged sequentially from top to bottom, with the base 1 serving a supporting function. The top seat 6, spring pressure plate 5, and base 1 can have the same or different shapes and sizes, designed according to actual needs; when the three have the same shape and size, they can all be square, such as a square or rectangle, or they can all be circular, such as an ellipse or a perfect circle.

[0030] Four guide rods 2 are fixedly installed between the top seat 6 and the base 1. The guide rods 2 are symmetrically distributed in pairs and installed at equal intervals. Their lower parts are fixed to the base 1 by threaded connection, and their upper parts pass through the spring pressure plate 5 and are wedge-shaped connected to the top seat 6. In a specific embodiment, the top seat 6 is directly installed on the wedge-shaped frustum on the top of the guide rods 2 for fixation.

[0031] The function of the guide rod 2 is to guide the spring pressure plate 5. The spring pressure plate 5 is sleeved on the four guide rods 2 and can move up and down along the guide.

[0032] Several spring guide rods for mounting the spring to be tested are provided between the spring pressure plate 5 and the base 1, including, for example... Figure 2 The cylindrical spring guide rod 3 of the shape shown, and as shown Figure 3 The irregularly shaped spring guide rod 9 is shown in the diagram. The cylindrical spring guide rod 3 can be used to install and test common cylindrical springs, whose outer diameter is smaller than the inner diameter of the spring being tested. The irregularly shaped spring guide rod 9, however, is used to install and test irregularly shaped springs. Figure 3 As can be seen, the upper part of the irregular spring guide rod 9 is a slender cylindrical structure, while the lower part is similar to a trumpet shape to facilitate the installation of irregular springs.

[0033] from Figure 1 As can be seen, the lower part of the spring guide rod is fixed to the base 1, but its upper part is positioned between the top seat 6 and the spring pressure plate 5. The spring pressure plate 5 has multiple through holes for one end of the spring guide rod to pass through. Specifically, the lower part of the cylindrical spring guide rod 3 is fixed to the base 1 via a threaded connection, and its upper part passes through the through hole without connecting to the top seat 6; the lower part of the irregularly shaped spring guide rod 9 is fixed to the base 1 via a threaded connection, and its upper part passes through the through hole without connecting to the top seat 6.

[0034] The top seat 6 has a threaded through hole that matches the main threaded guide rod 8, and the spring pressure plate 5 also has a corresponding threaded hole that matches the main threaded guide rod 8. The turntable 7 is rigidly fixedly connected to the main threaded guide rod 8 and rotates synchronously. The main threaded guide rod 8 and the spring pressure plate 5 are connected by a threaded rotation. Thus, when the turntable 7 is rotated, the main threaded guide rod 8 rotates synchronously, controlling the up and down movement of the spring pressure plate 5, thereby realizing the stretching and compression of the spring under test.

[0035] Furthermore, several pairs of spring hooks are provided between the spring pressure plate 5 and the base 1. The spring hooks are symmetrically installed on the lower end face of the spring pressure plate 5 and the upper end face of the base 1, respectively, for mounting the spring to be tested and the tension sensor 11. In practical applications, the spring to be tested is connected to the tension sensor 11 and then connected to the upper and lower spring hooks respectively. In this way, when the spring pressure plate 5 moves upward and applies tension to the spring to be tested, the tension sensor 11 connected to the spring to be tested can acquire test data in real time.

[0036] In order to obtain mechanical test data in real time, pressure sensor measurement units 4 are installed on both the cylindrical spring guide rod 3 and the irregular spring guide rod 9; specifically, pressure sensor measurement units 4 are installed on the upper part of the spring guide rod, and the upper end face of the pressure sensor measurement unit 4 is in contact with the spring pressure plate 5.

[0037] like Figure 4 As shown, the pressure sensor measuring unit 4 includes a hollow threaded rod 4-2 and gaskets 4-1 installed at both ends of the hollow threaded rod 4-2. The gaskets 4-1 are threadedly connected to the hollow threaded rod 4-2, therefore their position on the hollow threaded rod 4-2 is not fixed and can be adjusted by rotating along the threads of the hollow threaded rod 4-2 as needed. The pressure sensor measuring unit 4 also includes a thin-film pressure sensor. In specific applications, the hollow threaded rod 4-2 is sleeved on the upper part of the cylindrical spring guide rod 3 or the irregularly shaped spring guide rod 9. At this time, the spring rests on the lower gasket 4-1, and the upper gasket 4-1 contacts the spring pressure plate 5, where the thin-film pressure sensor can be placed.

[0038] The stress relaxation performance of the tension spring 10 is tested using the spring stress relaxation performance testing device provided by this utility model. The steps are as follows:

[0039] (1) As Figure 5 As shown, one end of the tension spring 10 to be tested is mounted on the spring hook provided on the lower end face of the spring pressure plate 5, and the other end is connected to the tension sensor 11. The lower end of the tension sensor 11 is connected to the spring hook on the base 1.

[0040] (2) Rotate the turntable 7 to move the spring pressure plate 5 upward, apply an upward pulling force to the spring under test, and record the mechanical performance data of the tension spring 10 at the same time.

[0041] (3) Place the above-installed device into the high and low temperature cycling equipment, set the required test temperature and carry out the test. During the test, use the tension sensor 11 to obtain the spring mechanical performance data in real time.

[0042] (4) Once the entire test cycle is completed, the equipment can be removed to complete the test.

[0043] The stress relaxation performance of the compression spring 12 was tested using the spring stress relaxation performance testing device provided by this utility model. The steps are as follows:

[0044] (1) Taking a conventional cylindrical compression spring 12 as an example, the spring is sleeved on the cylindrical spring guide rod 3, such as... Figure 6 As shown, we are preparing to conduct the experiment;

[0045] (2) Rotate the turntable 7 to move the spring pressure plate 5 downward, apply a downward pressure to the compression spring 12 to be tested, and as the spring deforms under the force, the thin film pressure sensor can acquire the test data in real time; continue to rotate the turntable 7 until the compression spring 12 is deformed to the specified deformation by the spring pressure plate 5.

[0046] (3) The equipped device was placed in a high and low temperature cycling equipment for testing. During the test, the spring mechanical performance data were obtained in real time using a thin film pressure sensor.

[0047] (4) Once the entire cycle is complete, the device can be removed, and the test is complete.

[0048] If a test is required to assess the stress relaxation performance of irregularly shaped springs, it can be achieved simply by replacing the spring guide rod 9 with the irregularly shaped spring guide rod.

[0049] When using the spring stress relaxation performance testing device provided by this utility model to conduct spring stress relaxation tests with different compression requirements:

[0050] The required spring compression varies depending on the application scenario. By using the pressure sensor measuring unit 4 and adjusting the shim 4-1, the height of the pressure sensor measuring unit 4 can be adjusted, thereby enabling the testing of spring stress relaxation under different compression levels.

[0051] The equipped device was placed in a high and low temperature cycling device for testing. During the test, the mechanical performance data of the spring was acquired in real time using a thin-film pressure sensor.

[0052] Once the entire cycle is complete, the device can be removed to complete the test.

[0053] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model 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, alterations, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A spring stress relaxation performance testing device, characterized in that, The device includes a top seat, a spring pressure plate, and a base arranged sequentially from top to bottom. Four guide rods are fixedly installed between the top seat and the base. The spring pressure plate is sleeved on the four guide rods and can move up and down along the guide rods. Several cylindrical spring guide rods and irregular spring guide rods for installing the springs to be tested are arranged between the spring pressure plate and the base. Pressure sensor measuring units are installed on the cylindrical spring guide rods and irregular spring guide rods. The top seat has a through hole for installing a rotating assembly. The rotating assembly consists of a turntable and a main threaded guide rod that are fixedly connected. The main threaded guide rod passes through the spring pressure plate and is threadedly connected to the spring pressure plate. The spring pressure plate is moved up and down by rotating the main threaded guide rod.

2. The spring stress relaxation performance testing device according to claim 1, characterized in that, Several pairs of spring hooks are also provided between the spring pressure plate and the base. The spring hooks are symmetrically installed on the lower end face of the spring pressure plate and the upper end face of the base, respectively, for installing the spring to be tested and the tension sensor.

3. The spring stress relaxation performance testing device according to claim 1, characterized in that, The pressure sensor measurement unit includes a hollow threaded rod, gaskets installed at both ends of the hollow threaded rod, and a thin-film pressure sensor. The gaskets are threadedly connected to the hollow threaded rod and can rotate along the thread of the hollow threaded rod to adjust their own position.

4. The spring stress relaxation performance testing device according to claim 3, characterized in that, The hollow threaded rod is sleeved on a cylindrical spring guide rod or a non-circular spring guide rod, and a thin-film pressure sensor is installed on the side of the gasket that contacts the spring pressure plate.

5. The spring stress relaxation performance testing device according to claim 1, characterized in that, The spring pressure plate is provided with several through holes for the spring guide rod to pass through; the lower part of the cylindrical spring guide rod is fixed to the base by a threaded connection, and its upper part passes through the through hole and is not connected to the top seat; the lower part of the irregular spring guide rod is fixed to the base by a threaded connection, and its upper part passes through the through hole and is not connected to the top seat.

6. The spring stress relaxation performance testing device according to claim 1, characterized in that, The turntable is equipped with a handle. By rotating the turntable with the handle, the main thread guide rod rotates together with the turntable, thereby driving the spring pressure plate to move up and down along the thread of the main thread guide rod.

7. The spring stress relaxation performance testing device according to claim 1, characterized in that, The top seat, spring pressure plate, and base are identical in shape and size, and are either square or round.

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