A reciprocating vacuum resistance test device for rubber hose

Abstract

The utility model discloses a kind of rubber hose reciprocating vacuum resistance test device, including sample clamping and sealing device, vacuum generating device and circulation control device;The sample clamping and sealing device includes oppositely arranged left sealing connector and right sealing connector, left sealing connector adjustable setting is on test platform, right sealing connector is fixedly arranged on test platform, first servo valve and second servo valve are respectively arranged on left sealing connector and right sealing connector, and right sealing connector is connected vacuum generating device through vacuum pipeline;The vacuum generating device is used to carry out vacuumizing operation to the rubber hose clamped between left sealing connector and right sealing connector;The circulation control device is used to control the opening and closure of first servo valve and second servo valve and the start and stop of vacuum generating device.The utility model can simulate the use condition of rubber hose under repeated negative pressure environment, accurately assess its negative pressure fatigue resistance by setting vacuumizing-pressure maintaining-pressure releasing cycle.

Description

Technical Field

[0001] This utility model relates to a reciprocating vacuum resistance testing device for rubber hoses, belonging to the field of vacuum resistance testing for rubber hoses. Background Technology

[0002] Rubber hoses are widely used in the automotive, machinery, chemical, and water conservancy industries. Some rubber hoses need to operate in negative pressure (vacuum) environments for extended periods or undergo repeated switching between negative and normal pressure conditions. Under such conditions, rubber hoses may experience cracking, leakage, deformation, or other problems due to material fatigue, structural defects, etc., affecting their service life and safety.

[0003] Currently, most negative pressure performance tests for rubber hoses involve single-cycle vacuum holding pressure tests, which cannot simulate the repeated negative pressure cycles in actual use and therefore cannot accurately assess the negative pressure fatigue resistance of rubber hoses. Existing equipment suffers from low automation, inconvenient test parameter adjustment, and inaccurate cycle counting, making it difficult to meet the needs of batch testing and high-precision testing.

[0004] Therefore, there is an urgent need to design an automated device that can perform repeated vacuum cycle tests on rubber hoses to fill the gap in existing technology. Utility Model Content

[0005] The purpose of this invention is to provide a device for repeated vacuum testing of rubber hoses, so as to solve the problems of existing technologies that cannot simulate repeated negative pressure cycle conditions, have low detection accuracy, and lack automation.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a reciprocating vacuum resistance testing device for rubber hoses, comprising a sample clamping and sealing device, a vacuum generating device, and a circulation control device; the sample clamping and sealing device includes a left sealing joint and a right sealing joint arranged opposite to each other, the left sealing joint being adjustablely mounted on the testing platform, and the right sealing joint being fixedly mounted on the testing platform, the left sealing joint and the right sealing joint being respectively provided with a first servo valve and a second servo valve, and the right sealing joint being connected to the vacuum generating device through a vacuum pipe; the vacuum generating device is used to perform a vacuuming operation on the rubber hose clamped between the left sealing joint and the right sealing joint; the circulation control device is used to control the opening and closing of the first servo valve and the second servo valve, as well as the start and stop of the vacuum generating device.

[0007] Furthermore, the test platform is equipped with a slide rail, and the left sealing joint is slidably mounted on the slide rail. The distance between the left and right sealing joints can be adjusted by sliding to accommodate rubber hoses of different lengths to be tested.

[0008] Furthermore, the two ends of the rubber hose to be tested are fixed to the left sealing joint and the right sealing joint by clamps.

[0009] Furthermore, the vacuum generating device includes a vacuum pump, a vacuum tank, a first vacuum pipe, and a second vacuum pipe. The vacuum pump and the right sealing joint are connected through the first vacuum pipe, and the vacuum pump and the vacuum tank are connected through the second vacuum pipe.

[0010] Furthermore, the first vacuum pipe is equipped with a vacuum valve and a filter.

[0011] Furthermore, the vacuum tank is equipped with a pressure relief valve.

[0012] Furthermore, the cycle control device includes a PLC controller, a touch screen, and a cycle calculator. The PLC controller is used to control the opening and closing of various valves and the operation of the vacuum pump. The touch screen is used to display and set test parameters, and the cycle calculator is used to count the number of vacuum cycles.

[0013] Furthermore, the left and right sealing joints are equipped with vacuum sensors for detecting the vacuum level of the cavity, and the detection results are transmitted to the circulation control device.

[0014] Furthermore, the test platform is also equipped with an audible and visual alarm and a monitoring camera, with the monitoring camera connected to a computer monitor.

[0015] Furthermore, the test platform is equipped with a protective cover.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] It can simulate the working conditions of rubber hoses under repeated negative pressure environments, and accurately evaluate their resistance to negative pressure fatigue by setting a vacuum-pressure holding-pressure release cycle.

[0018] The use of automated control allows for precise setting and adjustment of test parameters (vacuum degree, time, number of tests, etc.), improving the consistency and reliability of testing.

[0019] Equipped with observation and detection devices and an alarm system, it can monitor the sample status in real time, detect defects in a timely manner and trigger an alarm, thus improving the safety and efficiency of the test;

[0020] With a reasonable structural design, it is suitable for rubber hose samples of different specifications, has strong versatility, and can be widely used in quality inspection of rubber hose manufacturers and performance research of scientific research institutions. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the reciprocating vacuum resistance test device for rubber hoses.

[0022] Figure 2This is a schematic diagram of the left and right sealing joint structure.

[0023] Figure 3 This is a schematic diagram of a vacuum generator.

[0024] The diagram is labeled as follows: 1-Test platform, 2-Sample clamping and sealing device, 21-Left sealing joint, 22-Right sealing joint, 23-First servo valve, 24-Second servo valve, 3-Vacuum generator, 31-Vacuum pump, 32-Vacuum storage tank, 33-First vacuum pipeline, 34-Second vacuum pipeline, 35-Vacuum valve, 36-Pressure relief valve, 37-Vacuum sensor, 38-Filter, 4-Circulation control device, 41-Controller, 42-Touch screen, 5-Monitoring camera, 6-Protective cover, 7-Rubber hose acoustic sample, 8-Audio and visual alarm. Detailed Implementation

[0025] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0026] like Figures 1 to 3 As shown, a reciprocating vacuum resistance testing device for rubber hoses includes a sample clamping and sealing device 2, a vacuum generating device 3, and a circulation control device 4.

[0027] The sample clamping and sealing device 2 includes a left sealing joint 21 and a right sealing joint 22 arranged opposite to each other. The left sealing joint 21 is adjustablely mounted on the test platform 1, and the right sealing joint 22 is fixedly mounted on the test platform 1. The left sealing joint 21 and the right sealing joint 22 are respectively provided with a first servo valve 23 and a second servo valve 24. The right sealing joint 22 is connected to the vacuum generating device 3 through a vacuum pipe. The first servo valve 23 is used to control the connection between the left sealing joint 21 and the outside, and the second servo valve 24 is used to control the connection between the right sealing joint 22 and the vacuum generating device 3.

[0028] The vacuum generating device 3 is used to perform a vacuuming operation on the rubber hose 7 clamped between the left sealing joint 21 and the right sealing joint 22. The vacuum generating device 3 includes a vacuum pump 31, a vacuum tank 32, a first vacuum pipe 33, and a second vacuum pipe 34. The vacuum pump 31 and the right sealing joint 22 are connected through the first vacuum pipe 33, and the vacuum pump 31 and the vacuum tank 32 are connected through the second vacuum pipe 34. A vacuum valve 35 and a filter 38 are provided on the first vacuum pipe 33, and a pressure relief valve 36 is provided on the vacuum tank 32. The vacuum valve 35 is used to control the vacuuming process, and the pressure relief valve 36 is used to control the pressure relief process.

[0029] The cycle control device 4 is used to control the opening and closing of the first servo valve and the second servo valve, as well as the start and stop of the vacuum generator 3. The cycle control device 4 includes a PLC controller 41, a touch screen 42, and a cycle calculator. The PLC controller 41 is used to control the opening and closing of each valve and the operation of the vacuum pump. The touch screen 42 is used to display and set test parameters. The cycle calculator is used to count the number of vacuum cycles.

[0030] In this embodiment, the test platform 1 is equipped with a slide rail, and the left sealing joint 21 is slidably mounted on the slide rail. The distance between the left sealing joint 21 and the right sealing joint 22 can be adjusted by sliding to accommodate rubber hoses 7 of different lengths to be tested. The two ends of the rubber hose 7 to be tested are fixed to the left sealing joint 21 and the right sealing joint 22 by clamps.

[0031] In this embodiment, vacuum sensors 37 for detecting the vacuum level of the cavity are provided on the left sealing joint 21 and the right sealing joint 22. The vacuum sensors 37 are used to monitor the vacuum level of the sealed cavity in real time and feed the signal back to the circulation control device 4.

[0032] In this embodiment, the test platform 1 is also equipped with an audible and visual alarm 8, a monitoring camera 5, and a protective cover 6. The audible and visual alarm 8 emits an alarm signal to remind the operator to handle the situation. The monitoring camera 5 is connected to a computer monitor. The protective cover 6 can prevent safety hazards caused by accidental breakage of the sample during the test. The transparent observation window on the protective cover facilitates intuitive observation.

[0033] Working principle of this experimental setup:

[0034] The internal pressure of the hose is reduced by a vacuum pump, causing the hose to collapse. Observe whether there is any damage to the inner wall of the hose at the joint. During the test, the first servo valve connected to one end of the hose is closed, and the second servo valve connected to the other end is open. The second servo valve is connected to the vacuum pump. Start the vacuum pump, with the first servo valve in the "closed" state and the second servo valve in the "open" state. Maintain a specific vacuum level for a certain period of time (e.g., 5 minutes). The hose should collapse. Then, close the second servo valve and open the first servo valve to restore atmospheric pressure. This is one cycle. After repeating the cycle a certain number of times (e.g., 30,000 times), check the hose for any signs of deformation or damage, and also check for any signs of deformation or delamination in the reinforcing layer or inner lining.

[0035] The working process of this experimental setup is as follows:

[0036] 1. The operator places the two ends of the rubber hose sample 7 onto the left sealing joint 21 and the right sealing joint 2 respectively, and tightens them with clamps to prevent air leakage.

[0037] 2. Set the test parameters on the touch screen 42: target vacuum degree -0.06MPa, pressure holding time 1min, pressure release time 1min, total number of cycles 30000;

[0038] 3. Start the test. PLC controller 41 controls vacuum valve 35 to open, first servo valve to close, second servo valve to open, vacuum pump 31 starts working, and vacuum tank 32 is used to evacuate the internal cavity of the sample.

[0039] 4. When the vacuum sensor 37 detects that the cavity vacuum level reaches -0.06MPa, the PLC controller 41 controls the vacuum valve 35 to close, and the pressure holding stage begins, and the pressure holding timer starts.

[0040] 5. After holding the pressure for 5 minutes, the PLC controller 41 controls the pressure relief valve 36 to open or the first servo valve to open and the second servo valve to close, so that the hose cavity is connected to the atmosphere. After depressurizing for 1 minute, the pressure relief valve 36 is closed and the cycle counter 43 increments by 1.

[0041] 6. Repeat steps 3-5 until the number of cycles reaches 30,000. The PLC controller 41 will stop the equipment from working, and the audible and visual alarm 8 will issue a warning alarm.

[0042] 7. During the test, the high-definition camera 5 captures the sample status in real time, and the operator can observe it on the monitor; if the sample leaks air (the vacuum degree cannot reach the set value or the vacuum degree drops too quickly during the pressure holding stage), the PLC controller 41 will immediately stop the test and trigger an alarm.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that the above embodiments do not limit the scope of protection of this utility model in any way, and all technical solutions obtained by equivalent substitution or other means fall within the scope of protection of this utility model. Parts not covered by this utility model are the same as or can be implemented using existing technology.

Claims

1. A reciprocating vacuum resistance testing device for rubber hoses, characterized in that, Includes sample clamping and sealing device, vacuum generator and circulation control device; The sample clamping and sealing device includes a left sealing joint and a right sealing joint arranged opposite to each other. The left sealing joint is adjustablely set on the test platform, and the right sealing joint is fixedly set on the test platform. The left sealing joint and the right sealing joint are respectively equipped with a first servo valve and a second servo valve. The right sealing joint is connected to a vacuum generator through a vacuum pipeline. The vacuum generator is used to perform a vacuuming operation on the rubber hose clamped between the left and right sealing joints. The cycle control device is used to control the opening and closing of the first servo valve and the second servo valve, as well as the start and stop of the vacuum generator.

2. The reciprocating vacuum resistance testing device for rubber hoses according to claim 1, characterized in that, The test platform is equipped with a slide rail, and the left sealing joint is slidably installed on the slide rail. The distance between the left and right sealing joints can be adjusted by sliding to accommodate rubber hoses of different lengths to be tested.

3. The reciprocating vacuum resistance testing device for rubber hoses according to claim 2, characterized in that, The rubber hose to be tested is fixed at both ends to the left and right sealing joints by clamps.

4. The reciprocating vacuum resistance testing device for rubber hoses according to claim 1, characterized in that, The vacuum generating device includes a vacuum pump, a vacuum tank, a first vacuum pipe, and a second vacuum pipe. The vacuum pump and the right sealing joint are connected through the first vacuum pipe, and the vacuum pump and the vacuum tank are connected through the second vacuum pipe.

5. The reciprocating vacuum resistance testing device for rubber hoses according to claim 4, characterized in that, The first vacuum pipe is equipped with a vacuum valve and a filter.

6. The reciprocating vacuum resistance testing device for rubber hoses according to claim 4, characterized in that, The vacuum storage tank is equipped with a pressure relief valve.

7. The reciprocating vacuum resistance testing device for rubber hoses according to claim 1, characterized in that, The cycle control device includes a PLC controller, a touch screen, and a cycle calculator. The PLC controller is used to control the opening and closing of various valves and the operation of the vacuum pump. The touch screen is used to display and set test parameters. The cycle calculator is used to count the number of vacuum cycles.

8. The reciprocating vacuum resistance testing device for rubber hoses according to claim 1, characterized in that, The left and right sealing joints are equipped with vacuum sensors for detecting the vacuum level of the cavity, and the detection results are transmitted to the circulation control device.

9. The reciprocating vacuum resistance testing device for rubber hoses according to claim 1, characterized in that, The test platform is also equipped with an audible and visual alarm and a monitoring camera, with the monitoring camera connected to a computer monitor.

10. The reciprocating vacuum resistance testing device for rubber hoses according to claim 1, characterized in that, The test platform is equipped with a protective cover.

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