Service life testing device for pressure spring production

Abstract

A service life testing device for pressure spring production comprises a testing platform, a testing box used for testing the service life of a pressure spring is fixedly installed on the testing platform, an opening facilitating taking and placing of the pressure spring is formed in the top of the testing box, and the opening is sealed through a sealing cover; transversely-arranged supporting shafts are inserted into the two sides of the testing box, a clamping gap used for being matched with a pressure spring is reserved between the supporting shafts, clamping plates matched with the pressure spring are fixedly installed on the supporting shafts in the testing box, clamping columns are further arranged on the clamping plates, and transverse driving devices are fixedly installed on the testing platform on the two sides of the testing box. The driving end of the transverse driving device is in transmission connection with a supporting shaft outside the test box; a heat exchange device is further installed in the test box, and a temperature and humidity instrument is further installed on the test box. By simulating the stress condition of the pressure spring in actual use, the service life of the pressure spring is tested, so that the durability and the service life of the pressure spring are evaluated.

Description

Technical Field

[0001] This utility model relates to the field of compression spring production technology, and in particular to a life testing device for compression spring production. Background Technology

[0002] Currently, compression springs are prone to failure under long-term alternating or static loads due to material fatigue, stress concentration, and environmental corrosion, mainly manifested as permanent deformation, fracture, or degradation of elastic properties. Therefore, life assessment is generally required during the production of compression springs. In traditional design, life assessment of compression springs often relies on empirical formulas or finite element simulations. However, the complex loads, environmental factors, and differences in material microstructure under actual working conditions lead to significant deviations between theoretical calculations and actual lifespan.

[0003] Therefore, directly testing the fatigue life of compression springs under real or simulated working conditions through experimental methods has become a key step in verifying the rationality of the design and optimizing material selection and process parameters. Utility Model Content

[0004] The technical problem to be solved by this utility model is to address the shortcomings of the existing technology by providing a life testing device for compression spring production. This device simulates the stress conditions of compression springs in actual use, performs life tests on them, evaluates their durability and service life, and provides a basis for product optimization design and quality control.

[0005] The technical problem to be solved by this utility model is achieved through the following technical solution. This utility model is a life testing device for compression spring production. The device includes a horizontally arranged testing platform, on which a testing chamber for life testing of the compression spring is fixedly installed. An opening for easy removal and placement of the compression spring is provided on the top of the testing chamber, and the opening is sealed by a sealing cover. Horizontally arranged support shafts are inserted on both sides of the testing chamber, with a clamping gap between the support shafts for the compression spring to engage. A clamping plate that engages with the compression spring is fixedly installed on the support shaft inside the testing chamber, and a snap-fit ​​post is also provided on the clamping plate. A horizontal driving device is fixedly installed on the testing platform on both sides of the testing chamber. The driving end of the horizontal driving device is connected to the support shaft outside the testing chamber. A reciprocating dynamic seal is installed at the junction of the support shaft and the testing chamber. A heat exchange device is also installed inside the testing chamber, and a temperature and humidity instrument is also installed on the testing chamber.

[0006] The technical problem to be solved by this utility model can also be further achieved by the following technical solution: For the life test device for compression spring production described above, a sealing post that matches the opening of the test chamber is provided at the bottom of the sealing cover, a sealing ring is fitted on the sealing post, and a handle is installed on the top of the sealing cover.

[0007] The technical problem to be solved by this utility model can also be further achieved through the following technical solution: For the life testing device for compression spring production described above, the transverse driving device is a hydraulic cylinder, which is transversely mounted on the test platform, and the hydraulic rod end of the hydraulic cylinder is fixedly connected to the support shaft.

[0008] The technical problem to be solved by this utility model can also be further realized by the following technical solution: For the life test device for compression spring production described above, the heat exchange equipment is a heat exchange tube that runs through the test box. The connection between the heat exchange tube and the test box is sealed with sealant. Both ends of the heat exchange tube are set on the outside of the test box and are equipped with quick connectors.

[0009] The technical problem to be solved by this utility model can also be further achieved through the following technical solution: For the life test device for compression spring production described above, the test box is also connected to a humidification pipe, the humidification pipe is connected to a humidifier, and a humidification control valve is installed on the humidification pipe.

[0010] The technical problem to be solved by this utility model can also be further achieved through the following technical solution: For the life testing device for compression spring production described above, a counting device for measuring the number of extension and retraction of the support shaft is also installed on the testing platform.

[0011] The technical problem to be solved by this utility model can also be further realized through the following technical solution: For the life testing device for compression spring production described above, the test box is in the shape of a cuboid, and a transparent window is installed on one side of the test box.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] 1. Simulates real-world working conditions, ensuring reliable test results:

[0014] This invention uses a transverse drive device to drive the support shaft and clamping plate to apply reciprocating compression force to the compression spring, which highly replicates the stress scenario of the compression spring in actual use, ensuring that the test results are highly consistent with the actual lifespan, and providing a reliable basis for product optimization.

[0015] 2. Compact structure and easy operation:

[0016] This utility model simplifies the testing process through a horizontally arranged testing platform and integrated design (such as clamping gap, sealing cover, and driving device), which facilitates the quick removal and sealing of the compression spring and improves testing efficiency.

[0017] 3. Controllable environment and strong adaptability:

[0018] This utility model includes an internal heat exchange device and a temperature and humidity meter, which can accurately adjust the test environment (such as temperature and humidity) to simulate the performance of the compression spring under different working conditions, and is suitable for life test needs in multiple scenarios. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of one structure of the present utility model. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] Reference Figure 1 A life testing device for compression spring production, which simulates the stress and environmental conditions of compression spring 16 under actual working conditions to achieve accurate evaluation of its durability, fatigue life and reliability. Specifically:

[0022] The device includes a test platform 1, which is arranged horizontally and serves as the support base for the entire device, ensuring the stability of the testing process. A test chamber 2 for life testing of the compression spring 16 is fixedly installed on the test platform 1. The test chamber 2 is rectangular in shape, which facilitates the formation of a test cavity inside. An opening is provided on the top of the test chamber 2 to facilitate the removal and placement of the compression spring 16. The opening is sealed by a sealing cover 3. A sealing post is provided at the bottom of the sealing cover 3, and a rubber sealing ring is fitted on the sealing post to form an elastic compression seal with the inner wall of the opening, ensuring the airtightness during the testing process. To facilitate the disassembly and assembly of the sealing cover 3, a handle 4 is also installed on the top of the sealing cover 3.

[0023] To facilitate real-time observation of the compression state, deformation, and failure characteristics (such as fracture and plastic deformation) of the compression spring 16, a transparent viewing window 13 is also installed on one side of the test chamber 2.

[0024] A horizontally arranged support shaft 5 is inserted on both sides of the test box 2. The shafts are parallel and the coaxiality is ≤0.05mm to ensure that the compression spring 16 is subjected to uniform force. A clamping gap is left between the support shafts 5 for the compression spring 16 to cooperate. A clamping plate 6 that cooperates with the compression spring 16 is fixedly installed on the support shaft 5 inside the test box 2. The plate surface is perpendicular to the axis. A snap-fit ​​post 7 is also provided on the clamping plate 6 for inserting into the compression spring 16 to prevent the compression spring 16 from shifting during compression.

[0025] A transverse drive device 8 is fixedly installed on the test platform 1 on both sides of the test box 2. The drive end of the transverse drive device is connected to the support shaft 5 on the outside of the test box 2 for transmission. It is used to drive the support shaft 5 to move horizontally as needed to realize the compression operation of the compression spring 16. Preferably, the transverse drive device 8 is a hydraulic cylinder. The hydraulic cylinder is installed horizontally on the test platform 1. The hydraulic rod end of the hydraulic cylinder is fixedly connected to the support shaft 5 through a flange. In order to ensure sealing, a reciprocating dynamic seal is installed at the junction of the support shaft 5 and the test box 2 to achieve low friction sealing under high frequency reciprocating motion.

[0026] In order to achieve test temperature control, a heat exchange device is also installed in the test chamber 2. Preferably, the heat exchange device is a heat exchange tube 9 that runs through the test chamber 2. The connection between the heat exchange tube 9 and the test chamber 2 is sealed with sealant. Both ends of the heat exchange tube 9 are located on the outside of the test chamber 2 and are equipped with quick connectors 10, which facilitates the connection of a constant temperature water bath or cooling unit to the outside through the quick connectors 10.

[0027] To achieve humidity control during testing, a humidification pipe 15 is connected to the test chamber 2. A humidifier is connected to the external humidification pipe 15, and a humidification control valve is installed on the humidification pipe 15.

[0028] In order to monitor the temperature and humidity of the test chamber 2, a temperature and humidity instrument 14 is also installed on the test chamber 2.

[0029] To record the number of compressions of the compression spring 16, a counting device for measuring the number of extensions and retractions of the support shaft 5 is also installed on the test platform 1. The counting device includes a magnetic ring 11 and a magnetic proximity switch 12 that cooperate with each other. The magnetic ring 11 is fitted onto the support shaft 5 to ensure that the magnetic ring 11 moves synchronously with the support shaft 5. The magnetic proximity switch 12 is installed on the test platform 1 directly below the magnetic ring 11. The switching signal of the magnetic proximity switch 12 is connected to an external counting module (such as a counter, PLC, or industrial controller), and the counting logic (such as rising edge triggering) is set. When the support shaft 5 moves the magnetic ring 11 away from and then approaches the magnetic proximity switch 12, that is, when the support shaft 5 extends or retracts, one count is recorded. At the same time, the external counting module is connected to a display screen for real-time monitoring.

[0030] The testing procedure for the compression spring production life testing device provided by this utility model is as follows:

[0031] 1. Open the sealing cover 3, put the compression spring 16 into the snap-fit ​​post 7 of the left clamping plate 6, push the right clamping plate 6 to make the compression spring 16 free, and record the initial length;

[0032] Close the sealing cap 3 and check the sealing performance (leakage rate ≤ 0.1 Pa·L / s through negative pressure holding test).

[0033] 2. Set test parameters:

[0034] Compression force: 500N~10kN (hydraulic cylinder pressure calculated based on spring stiffness 16);

[0035] Frequency: 0.1Hz~5Hz (corresponding to the extension and retraction speed of the hydraulic cylinder);

[0036] Temperature: -20℃ to 80℃ (typical operating range);

[0037] Humidity: 40%~80%RH (simulating a humid environment);

[0038] 3. Start the hydraulic system. The support shaft 5 drives the clamping plate 6 to apply reciprocating compression force to the compression spring 16. The counter records the number of cycles simultaneously until all preset test operations are completed.

[0039] 4. Remove the compression spring 16 and inspect its permanent deformation, surface cracks, etc.

[0040] If the compression spring 16 breaks, the permanent deformation exceeds 10% of the initial length, or the load force drops below 80% of the initial value, the compression spring 16 is deemed to have failed and is unqualified; otherwise, the compression spring 16 meets the requirements and is qualified.

Claims

1. A compression spring production end-of-life testing device, characterized by: The device includes a transversely arranged test platform, a test box for testing the service life of the compression spring is fixedly installed on the test platform, an opening for facilitating the taking and placing of the compression spring is arranged on the top of the test box, and the opening is sealed by a sealing cover; a support shaft arranged transversely is inserted on each side of the test box, a clamping gap for matching the compression spring is left between the support shafts, a clamping plate matched with the compression spring is fixedly installed on the support shaft in the test box, a clamping column is further arranged on the clamping plate, a transverse driving device is fixedly installed on the test platform on each side of the test box, the driving end of the transverse driving device is in transmission connection with the support shaft outside the test box, a reciprocating dynamic seal is installed at the joint of the support shaft and the test box; a heat exchange device is further installed in the test box, and a temperature and humidity instrument is further installed on the test box.

2. The device for testing the service life of a compression spring according to claim 1, characterized in that: A sealing column matched with the opening of the test box is arranged on the bottom of the sealing cover, a sealing ring is sleeved on the sealing column, and a handle is further installed on the top of the sealing cover.

3. The device for testing the service life of a compression spring according to claim 1, characterized in that: The transverse driving device is a hydraulic cylinder, which is transversely installed on the test platform, and the hydraulic rod end of the hydraulic cylinder is fixedly connected with the support shaft.

4. The device for testing the service life of a compression spring according to claim 1, characterized in that: The heat exchange device is a heat exchange pipe arranged through the test box, the joint of the heat exchange pipe and the test box is sealed by sealing glue, and the two ends of the heat exchange pipe are arranged outside the test box and are provided with quick couplings.

5. The device for testing the service life of a compression spring according to claim 1, characterized in that: The test box is further connected with a humidifying pipeline, the humidifying pipeline is connected with a humidifier, and a humidifying control valve is installed on the humidifying pipeline.

6. The device for testing the service life of compression springs according to claim 1, characterized in that: A counting device for counting the extension and retraction times of the support shaft is further installed on the test platform.

7. The device for testing the service life of compression springs according to claim 1, characterized in that: The test box is in the shape of a cuboid, and a transparent window is further installed on one side of the test box.

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