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Abstract

The utility model discloses a kind of air pressure pulse fatigue test devices, comprising: compressed air source, for providing initial compressed air as experimental gas source;Gas storage tank group, for storing and releasing compressed air;Wherein, gas storage tank group is communicated with compressed air source by gas supply pipeline, and gas supply pipeline is provided with switch valve;Gas storage tank group is communicated with sample installation part by test pipeline, and test pipeline is provided with three-way valve.The compressed air provided by compressed air source in the utility model is transported to gas storage tank group, cooperate pressure gauge, pressure relief valve and pressure regulating valve to carry out pressure stabilization and pressure regulation, then pulse control of high-frequency three-way valve is combined to carry out air pressure pulse fatigue test, solve the problem that traditional equipment pressure control precision is low, operation is complicated, realize the integration test process of accurate pressure output, long-time stable test and safety intelligent monitoring, can effectively meet the test requirement of industry standard to air pressure pulse fatigue test.

Description

Technical Field

[0001] This utility model relates to the field of testing equipment technology, specifically to a pneumatic pulse fatigue testing device. Background Technology

[0002] In the quality inspection of products such as hydraulic hoses, rubber or plastic hoses and assemblies, the pneumatic pulse fatigue test is a key test item for evaluating their fatigue resistance. According to standards such as GB / T7939-2008 "Test Method for Hydraulic Hose Assemblies" and GB / T5568-2006 "Rustler or Plastic Hose and Hose Assemblies Non-Flexible Hydraulic Pulse Test", a specific frequency (e.g., 0.5Hz) and pressure range (e.g., 0.75MPa~0.9MPa) of pulsed air pressure must be applied to the test piece, and the test must be continued for a period of time (e.g., 1000h, which can be intermittent). The pulse pressure cycle must conform to the curve specified in the standard (e.g., the shaded area in GB / T7939-2008).

[0003] Existing pneumatic pulse fatigue testing equipment has several shortcomings: First, it has poor pressure control accuracy, making it difficult to stably output pulse pressure curves that meet standards, resulting in large deviations in test results; second, the operation process is cumbersome, and the equipment has low integration, making the operability and stability of long-term intermittent tests poor; at the same time, safety protection is lacking, which limits both test safety and data accuracy. Utility Model Content

[0004] The purpose of this invention is to provide a pneumatic pulse fatigue testing device to solve the above problems.

[0005] To achieve the above objectives, this utility model specifically adopts the following technical solution, including:

[0006] Compressed air source, used to provide initial compressed air as an experimental gas source;

[0007] Air storage tank assembly, used to store and release compressed air;

[0008] The gas storage tank group is connected to a compressed air source through a gas supply pipeline, and the gas supply pipeline is equipped with a switch valve.

[0009] The gas storage tank assembly is connected to the sample mounting section via a test pipeline, which is equipped with a three-way valve.

[0010] As a further description of the above technical solution, a booster pump is also provided on the gas supply pipeline.

[0011] As a further description of the above technical solution, the gas storage tank group includes a first gas storage tank and a second gas storage tank.

[0012] As a further description of the above technical solution, the first gas storage tank is connected to a compressed air source through a gas supply pipeline.

[0013] As a further description of the above technical solution, the first gas storage tank, the second gas storage tank, and the sample mounting part are connected by a test pipeline.

[0014] As a further description of the above technical solution, the first gas storage tank is equipped with a first pressure sensor.

[0015] As a further description of the above technical solution, the first gas storage tank is also equipped with a first pressure relief valve.

[0016] As a further description of the above technical solution, the second gas storage tank is equipped with a pressure regulating valve.

[0017] As a further description of the above technical solution, the second gas storage tank is also equipped with a second pressure relief valve and a second pressure sensor.

[0018] As a further description of the above technical solution, a third pressure sensor is provided on the test pipeline that connects the three-way valve to the sample mounting part.

[0019] The beneficial effects of this utility model are as follows:

[0020] 1. In this utility model, compressed air supplied by the compressed air source is delivered to the air storage tank group, and pressure is stabilized and regulated in conjunction with the pressure gauge, pressure relief valve and pressure regulating valve. Then, combined with the pulse control of the high-frequency three-way valve, a pneumatic pulse fatigue test is carried out. This solves the problems of low pressure control accuracy and cumbersome operation of traditional equipment, and realizes an integrated testing process of accurate pressure output, long-term stable testing and intelligent safety monitoring. It can effectively meet the industry standard requirements for pneumatic pulse fatigue testing, and has excellent versatility. It is suitable for pneumatic pulse fatigue testing of various products such as hydraulic hoses, rubber / plastic hoses and assemblies.

[0021] 2. The entire experimental device in this utility model adopts a modular design, with clear functions and connections for each component, which facilitates installation and debugging. The cooperation between the pneumatic switching valve and the pneumatic three-way valve effectively simplifies the operation process, supports long-term intermittent testing, and can effectively improve the testing efficiency.

[0022] 3. Each gas storage tank is equipped with a pressure relief valve, which automatically releases pressure when overpressure occurs. In conjunction with a pressure sensor, the pressure value is monitored in real time, which facilitates timely adjustment of experimental parameters and troubleshooting of fault factors, and can effectively ensure experimental safety.

[0023] To more clearly illustrate the structural features and functions of this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the pneumatic pulse fatigue testing device of this utility model.

[0025] Figure label:

[0026] 1. Compressed air source; 2. Air storage tank group; 201. First air storage tank; 202. Second air storage tank; 3. Air supply pipeline; 4. Switch valve; 5. Test pipeline; 6. Three-way valve; 7. Booster pump; 8. First pressure sensor; 9. First pressure relief valve; 10. Pressure regulating valve; 11. Second pressure relief valve; 12. Second pressure sensor; 13. Sample mounting part; 14. Third pressure sensor. Detailed Implementation

[0027] 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.

[0028] like Figure 1 As shown, in one embodiment, a pneumatic pulse fatigue testing device includes: a compressed air source 1 and an air storage tank group 2;

[0029] The compressed air source 1 uses equipment such as an air compressor to continuously provide initial compressed air for the entire test device; while the air storage tank group 2 is used to store and release compressed air.

[0030] For example, the gas storage tank group 2 is connected to the compressed air source 1 through the gas supply pipeline 3 to ensure a stable gas supply; while the gas storage tank group 2 is connected to the sample mounting part 13 through the test pipeline 5 to provide a pulse air pressure output channel for the sample specimen to be tested.

[0031] It should be explained in detail that the air storage tank group 2 includes a first air storage tank 201 and a second air storage tank 202; wherein, the first air storage tank 201 is used to store compressed air supplied by the compressed air source 1, while the second air storage tank 202 is used to receive compressed air supplied by the first air storage tank 201, thereby stabilizing and adjusting the compressed air pressure value until it meets the test requirements of the air pressure pulse fatigue test.

[0032] Specifically, the first air storage tank 201 is connected to the compressed air source 1 through the air supply pipeline 3, and the first air storage tank 201, the second air storage tank 202 and the sample mounting part 13 are connected through the test pipeline 5.

[0033] It should be explained in detail that the first gas storage tank 201 is equipped with a first pressure sensor 8 and a first pressure relief valve 9; wherein, the first pressure sensor 8 adopts a high-precision pressure transmitter, which can provide real-time feedback on the pressure value of the first gas storage tank 201, thereby controlling the opening and closing of the switching valve 4.

[0034] Correspondingly, the first pressure relief valve 9 is a safety pressure relief valve. Its preset operating pressure value is set according to the pressure resistance limit of the first air tank 201. When the internal pressure of the first air tank 201 exceeds the safety threshold, the first pressure relief valve 9 will automatically open to quickly relieve pressure, ensuring the safe operation of the first air tank 201 and avoiding overpressure damage.

[0035] Correspondingly, the second air tank 202 is equipped with a pressure regulating valve 10, a second pressure relief valve 11, and a second pressure sensor 12; wherein, the pressure regulating valve 10 adopts a high-precision proportional regulating valve, which can accurately control the pressure range of the second air tank 202 (for example, adjust to 0.75MPa~0.9MPa) to ensure that the pulse curve meets the test requirements of GB / T7939-2008 "Test Method for Hydraulic Hose Assembly";

[0036] Correspondingly, the second pressure relief valve 11 is a safety pressure relief valve, and its preset operating pressure value is set according to the pressure resistance limit of the second air tank 202. When the internal pressure of the second air tank 202 exceeds the safety threshold, the second pressure relief valve 11 will automatically open to quickly relieve pressure, ensuring the safe operation of the second air tank 202 and avoiding overpressure damage. The second pressure sensor 12 is a high-precision pressure transmitter, which can provide real-time feedback on the pressure value of the second air tank 202, thereby controlling the opening and closing of the pressure regulating valve 10.

[0037] For example, the air supply line 3 is equipped with a switch valve 4 and a booster pump 7; wherein, the switch valve 4 is a pneumatic switch valve 4, used for manual / automatic control of the opening and closing of the compressed air supply line 3; correspondingly, the booster pump 7 is a pneumatic booster pump 7, which can boost the compressed air output from the compressed air source 1 to increase the pressure value to the high pressure range required by the pneumatic pulse fatigue test (e.g., output pressure > 0.9 MPa).

[0038] Correspondingly, a three-way valve 6 is installed on the test pipeline 5; the three-way valve 6 is a pneumatic three-way valve 6, with its inlet end connected to the outlet end of the first gas storage tank 201 and the second gas storage tank 202 respectively, and its outlet end connected to the sample mounting part 13. The on / off frequency is controlled by the control system (0.5Hz) to realize pulse pressure output. The PLC controller (as prior art) controls the output. Figure 1 (Not shown in the image) is controlled to switch on and off at a preset frequency (e.g., 0.5Hz) to achieve pulse pressure output;

[0039] Furthermore, a third pressure sensor 14 is installed on the test pipeline 5 that connects the three-way valve 6 to the sample mounting part 13; wherein, the third pressure sensor 14 adopts a high-precision pressure transmitter, which can monitor and feedback the pressure value applied to the sample by the second gas storage tank 202 through the three-way valve 6 in real time, thereby controlling the opening and closing of the three-way valve 6 and assisting in adjusting the test parameters.

[0040] Test procedure:

[0041] (1) Specimen installation: Multiple specimens are assembled into a sample specimen and installed on the sample mounting part 13;

[0042] (2) Air source start-up: Open the pneumatic switch valve 4 so that the compressed air delivered by the compressed air source 1 can flow through the booster pump 7 to be pressurized and enter the first air storage tank 201. At the same time, the first pressure gauge monitors the internal pressure value of the first air storage tank 201 in real time and ensures overpressure safety through the first pressure relief valve 9.

[0043] (3) Pressure regulation: The high-pressure air inside the first air tank 201 flows through the pneumatic three-way valve 6 into the second air tank 202. At the same time, the output pressure is regulated to the preset pressure value (e.g., 0.75MPa to 0.9MPa in this application) through the pressure regulating valve 10, and overpressure safety is ensured through the second pressure relief valve 11.

[0044] (4) Pulse application: The pneumatic three-way valve 6 is opened and closed according to a preset frequency (e.g., 0.5Hz in this application), thereby applying pulsed pressure air to the sample specimen;

[0045] (5) Test monitoring: The pressure value is monitored in real time by the second pressure sensor 12 to ensure that the pulse pressure cycle conforms to the curve specified in the standard (e.g., the shaded area in GB / T7939-2008);

[0046] (6) Results recording: The test shall be conducted for a period of time (e.g., 1000h, which may be run intermittently), and the number of cycles when the sample leaks (or the total number of cycles completed) shall be recorded. Other recording contents shall refer to the test requirements in Chapter 9 of GB / T5568-2006.

[0047] Through the above technical solution, this application achieves a stable output of pulsed air pressure ranging from 0.75MPa to 0.9MPa at a frequency of 0.5Hz, achieved by the synergistic effect of the high-pressure booster pump 7, the graded pressure stabilization of the gas storage tank group 2, and the precise control of the pressure regulating valve 10. The pressure curve fluctuation is controlled within ±0.02MPa, strictly matching the requirements of the pulse cycle curve in the GB / T7939-2008 standard. This fundamentally solves the problem of large deviations in test results due to low pressure control accuracy in traditional equipment. The device integrates precise pressure output, long-term stable operation, and intelligent safety monitoring into a unified testing process, fully meeting the various technical requirements of industry standards for pneumatic pulse fatigue testing. Furthermore, the device boasts excellent versatility. The device is adaptable to various product testing needs, including hydraulic hoses, rubber / plastic hoses, and various hose assemblies, by changing the sample mounting fixtures of different specifications. Furthermore, the entire experimental setup adopts a modular design concept, with standardized interfaces for each functional component, clear functional divisions, and simple connection lines, significantly reducing installation and debugging difficulty. The automated control of pneumatic switch valve 4 and pneumatic three-way valve 6 reduces manual intervention, simplifies the operation process, effectively supports long-term intermittent testing, and significantly improves testing efficiency. Each air tank is independently equipped with a pressure relief valve, forming double physical protection. Combined with real-time data monitoring and anomaly warning from pressure sensors, operators can promptly adjust experimental parameters and troubleshoot faults, minimizing experimental safety risks.

[0048] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pneumatic pulse fatigue testing device, characterized in that, include: Compressed air source, used to provide initial compressed air as an experimental gas source; Air storage tank assembly, used to store and release compressed air; The gas storage tank group is connected to a compressed air source through a gas supply pipeline, and the gas supply pipeline is equipped with a switch valve. The gas storage tank assembly is connected to the sample mounting section via a test pipeline, which is equipped with a three-way valve.

2. The pneumatic pulse fatigue testing device according to claim 1, characterized in that, A booster pump is also installed on the gas supply pipeline.

3. The pneumatic pulse fatigue testing device according to claim 1, characterized in that, The gas storage tank group includes a first gas storage tank and a second gas storage tank.

4. The pneumatic pulse fatigue testing device according to claim 3, characterized in that, The first air storage tank is connected to a compressed air source via an air supply pipeline.

5. The pneumatic pulse fatigue testing device according to claim 3, characterized in that, The first gas storage tank, the second gas storage tank, and the sample mounting part are connected by a test pipeline.

6. The pneumatic pulse fatigue testing device according to claim 3, characterized in that, The first gas storage tank is equipped with a first pressure sensor.

7. The pneumatic pulse fatigue testing device according to claim 3, characterized in that, The first gas storage tank is also equipped with a first pressure relief valve.

8. The pneumatic pulse fatigue testing device according to claim 3, characterized in that, The second gas storage tank is equipped with a pressure regulating valve.

9. The pneumatic pulse fatigue testing device according to claim 3, characterized in that, The second gas storage tank is also equipped with a second pressure relief valve and a second pressure sensor.

10. The pneumatic pulse fatigue testing device according to claim 1, characterized in that, A third pressure sensor is installed on the test pipeline that connects the three-way valve to the sample mounting section.

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