CN115931342A - Comprehensive test bed for safety valve and comprehensive test method - Google Patents

Abstract

The invention discloses a comprehensive test bed for a safety valve and a comprehensive test method, which relate to the technical field of safety valve test and comprise the following steps: the device comprises a supercharging device, a first pressure container, a temperature adjusting device, an air path adjusting device, a second pressure container, a safety valve test branch, a safety valve to be tested and a numerical control center which are sequentially connected along the gas transmission direction; the safety valve to be tested is placed in the environment adjusting bin, and different working environment temperatures are provided for the safety valve to be tested; the safety valve to be measured is provided with a spraying device and an image acquisition device, the spraying device is used for spraying leakage measurement liquid to the safety valve to be measured, and the image acquisition device is used for acquiring a surface image of the safety valve to be measured. The safety valve test system can simulate different working temperatures and different working pressures of the safety valve and can also simulate different working environments of the safety valve, so that various tests can be performed on the safety valve to be tested under different working temperatures, different working pressures and different working environments, and the working performance of the safety valve to be tested can be comprehensively tested.

Description

A comprehensive test bench and comprehensive test method for safety valve

technical field

The invention relates to the technical field of safety valve testing, in particular to a comprehensive test bench and a comprehensive testing method for safety valves.

Background technique

With the vigorous development of rail transportation, high-speed railway trains and urban rail trains will work under various external conditions such as temperature and humidity. Among them, the air source device that provides clean and high-pressure gas power for the braking system is the core of safety equipment.

The compressor in the air source device completes the compression of atmospheric air, and stores the subsequent purified high-pressure air in the high-pressure air storage tank. The safety valve is used to adjust the air pressure in the air storage tank to within the safe pressure threshold.

The safety valve is a valve for safety protection and an automatic pressure relief valve. Its opening and closing parts are in a normally closed state under the action of external force. When the medium pressure in the equipment or pipeline rises and exceeds the specified safety value, the valve automatically Opening, by discharging a rated amount of medium to the outside of the system, to prevent the medium pressure in the pipeline or equipment from exceeding the specified safety value, when the medium pressure in the pipeline or equipment returns to normal, the valve will close again and prevent the medium from continuing to flow out.

Therefore, it is necessary to carry out experimental tests on the safety valve to test the working performance of the safety valve.

Contents of the invention

In order to overcome the defects in the above-mentioned prior art, the present invention provides a comprehensive test bench for safety valves, which can simulate different working temperatures and different working pressures of safety valves, and can also simulate different working environments of safety valves, thereby being able to Conduct various tests on the safety valve to be tested under different working temperatures, different working pressures, and different working environments to comprehensively test the working performance of the safety valve to be tested.

To achieve the above object, the present invention adopts the following technical solutions, including:

A comprehensive test bench for safety valves. The comprehensive test bench includes: a booster device, a first pressure vessel, a temperature adjustment device, a gas path adjustment device, a second pressure vessel, and a safety valve test support connected sequentially along the direction of gas transmission. road, safety valve to be tested;

The pressurization device is used to pressurize the gas and input the pressurized gas into the first pressure vessel; the temperature adjustment device is used to adjust the temperature of the gas flowing into the second pressure vessel; the gas path adjustment The device is used to adjust the flow of gas flowing into the second pressure vessel; the second pressure vessel is used to store the gas at the set pressure and temperature for the test of the safety valve to be tested; the safety valve to be tested passes through The safety valve test branch is connected with the second pressure vessel;

The second pressure vessel is also connected to a discharge device, and the discharge device is used to discharge the gas in the second pressure vessel;

Both the first pressure vessel and the second pressure vessel are provided with a temperature sensor and a pressure sensor for collecting the gas temperature and gas pressure in the pressure vessel;

The comprehensive test bench also includes an environment adjustment chamber, the safety valve to be tested is placed in the environment adjustment chamber, and the environment adjustment chamber is used to provide different working environment temperatures for the safety valve to be tested;

The comprehensive test bench also includes a spraying device and an image acquisition device, the spraying device is used to spray the leakage measurement liquid to the safety valve to be tested, and the image acquisition device is used to collect the surface image of the safety valve to be tested;

The comprehensive test bench also includes a numerical control center, which is connected with each sensor for receiving data collected by each sensor; and the numerical control center is also connected with each device for controlling each device.

Preferably, the pressurization device includes a high-pressure gas circuit and a normal-pressure gas circuit connected in parallel, the high-pressure gas circuit is provided with a first cut-off valve and a booster pump, and the normal-pressure gas circuit is provided with a second stop valve; the discharge device It includes a second one-way valve, a third regulating valve and a muffler connected in sequence along the gas transmission direction.

Preferably, the temperature adjustment device includes a cooler and a heater.

Preferably, the gas path adjustment device includes a third cut-off valve, a first one-way valve, and a regulating valve assembly connected in sequence along the gas transmission direction; the regulating valve assembly includes a first regulating valve and a second regulating valve connected in parallel ; Both the first regulating valve and the second regulating valve are used to regulate the air volume, and the regulating precision of the first regulating valve is smaller than that of the second regulating valve.

Preferably, the spray device includes a liquid storage tank, a liquid pump, a third pressure sensor, and a spray head connected in sequence along the liquid flow direction; the liquid storage tank is used to store leakage measurement liquid, and the liquid pump uses For adjusting the hydraulic pressure, the third pressure sensor is used to measure the hydraulic pressure, and the spray head is located above the safety valve to be tested, and is used for spraying the safety valve to be tested.

Preferably, the camera of the image acquisition device is arranged on the side of the safety valve to be tested, and rotates and displaces along the surface of the safety valve to be tested, so as to collect surface images of the safety valve to be tested at various angles.

Preferably, the comprehensive test bench also includes a gas purification device for purifying the gas input into the first pressure vessel; the purification process includes dust removal, oil removal, and water removal; the gas purification device includes The dust collector, oil remover and water remover connected in sequence.

The present invention also provides a comprehensive test method for a comprehensive test bench for a safety valve, using the comprehensive test bench to perform an air tightness test on the safety valve to be tested, the specific method is as follows:

S11, installing the safety valve to be tested on the safety valve test branch of the comprehensive test bench, and entering the factory parameters of the safety valve to be tested into the numerical control center as calibration parameters;

S12, connecting the input end of the booster device to a gas source, inputting gas to the booster device, and the numerical control center controls the booster device to input high-pressure gas into the first pressure vessel;

S13, the numerical control center opens the gas path regulating device, inputs the high-pressure gas stored in the first pressure vessel into the second pressure vessel and the safety valve test branch, and adjusts the gas pressure in the second pressure vessel by controlling the gas path regulating device After reaching the set pressure, close the gas path adjustment device; where, the set pressure is A% of the factory set pressure of the safety valve to be tested;

S14, the numerical control center opens the spraying device, sprays the leakage measurement liquid to the safety valve to be tested, and closes the spraying device after the surface of the safety valve to be tested is infiltrated with the leakage measurement liquid;

S15, the numerical control center turns on the image acquisition device, collects the surface image of the safety valve to be tested at the current moment, that is, the time T1, and sends the surface image of the safety valve to be tested at the time T1 to the numerical control center;

S16, after an interval of Δt, collect the surface image of the safety valve to be tested at the current time, that is, the time T2, and send the surface image of the safety valve to be tested at the time T2 to the CNC center; T2=T1+Δt;

S17, according to the surface images of the safety valve to be tested at the time T1 and T2, the numerical control center compares and analyzes the surface images at the two time points before and after:

Count the number of bubbles in the surface image at two moments before and after, as well as the position and circumference of each bubble. If the number of bubbles in the surface image at time T2 is greater than the number of bubbles in the surface image at time T1, or, the surface image at time T2 If the circumference of a certain bubble in the image is greater than the circumference of the bubble at the corresponding position in the surface image at time T1, it means that the safety valve to be tested leaks at A% of the factory set pressure; otherwise, it means that the safety valve to be tested is at A There is no air leakage under the factory set pressure of %;

S18, the numerical control center controls the gas path regulating device to pressurize the second pressure vessel, so that the gas pressure in the second pressure vessel increases by Δa% each time until the pressurization reaches the factory set pressure, and according to the method of steps S14-S17, Respectively test the safety valve to be tested at (A+Δa)% of the factory set pressure, (A+2Δa)% of the factory set pressure, (A+3Δa)% of the factory set pressure, ..., the factory set pressure air tightness;

S19, the numerical control center controls the temperature regulating device to adjust the gas temperature in the second pressure vessel, and respectively tests the airtightness of the safety valve to be tested at different gas temperatures according to steps S14-S18.

Preferably, the comprehensive test bench is used to carry out discharge pressure test, pressure holding test, reseating pressure test, pulse withstand voltage test, and reliability test in sequence for the safety valve to be tested. The specific methods are as follows:

S21, installing the safety valve to be tested on the safety valve test branch of the comprehensive test bench, and entering the factory parameters of the safety valve to be tested into the numerical control center as calibration parameters;

S22, connect the input end of the booster device to a gas source, input gas to the booster device, and the numerical control center controls the booster device to input high-pressure gas into the first pressure vessel;

S23, the numerical control center opens the gas path regulating device, and inputs the high-pressure gas stored in the first pressure vessel into the second pressure vessel and the safety valve test branch;

S24, conduct a discharge pressure test on the safety valve to be tested:

S241, the numerical control center controls the gas path regulating device, pressurizes the second pressure vessel, and after the gas pressure in the second pressure vessel reaches the set pressure, closes the gas path regulating device; wherein, the set pressure is the safety valve to be tested A% of factory set pressure;

S242, the numerical control center controls the air path regulating device to continue to pressurize the second pressure vessel, and at this time the pressurization speed is lower than the pressurization speed of step S241, and the numerical control center judges the second pressure vessel in real time according to the data collected by the pressure sensor on the second pressure vessel The pressure drop in the second pressure vessel, if the pressure drop rate exceeds the set threshold value, record the gas pressure in the second pressure vessel when the first pressure drop rate exceeds the set threshold value at this time, and record the second pressure drop rate at this time 2. The gas pressure in the pressure vessel is used as the actual set pressure of the safety valve to be tested; otherwise, continue to pressurize until the first pressure drop rate exceeds the set threshold, and the actual set pressure of the safety valve to be tested is obtained;

S243, after the first pressure drop rate exceeds the set threshold, the numerical control center controls the gas path adjustment device to continue to pressurize the second pressure vessel, and at this time the pressurization speed is lower than the pressurization speed of step S241, the numerical control center according to the first The collected data of the pressure sensor on the second pressure vessel is used to judge the pressure drop in the second pressure vessel in real time. If the pressure drop rate exceeds the set threshold, record the first time when the second pressure drop rate exceeds the set threshold. The gas pressure in the second pressure vessel, and the gas pressure in the second pressure vessel at this time is taken as the actual discharge pressure of the safety valve to be tested; otherwise, continue to pressurize until the second pressure drop rate exceeds the set threshold, Obtain the actual discharge pressure of the safety valve to be tested;

If the discharge pressure test of the safety valve to be tested is qualified, that is, the actual discharge pressure and the actual set pressure of the safety valve to be tested meet the error range of the calibration parameters, proceed to the next test, otherwise, terminate the test and report the reason for the termination of the test;

S25, conduct a pressure-holding test on the safety valve to be tested:

S251, the numerical control center controls the gas path regulating device so that after the gas pressure in the second pressure vessel reaches the set pressure, close the gas path regulating device; wherein, the set pressure is A% of the actual set pressure of the safety valve to be tested;

S252. The numerical control center judges the pressure drop in the second pressure vessel in real time according to the data collected by the pressure sensor on the second pressure vessel. If the pressure drop rate exceeds the set threshold or the pressure drop exceeds the set value within a specified time, it indicates The safety valve to be tested does not maintain pressure at A% of the actual set pressure; otherwise, it means that the safety valve to be tested is maintained at A% of the factory set pressure;

S253, the numerical control center controls the gas path regulating device to pressurize the second pressure vessel, so that the gas pressure in the second pressure vessel increases by Δa% each time until the pressurization reaches the actual set pressure, and respectively test according to the method of step S252 The pressure holding performance of the safety valve to be tested at (A+Δa)% of the actual set pressure, (A+2Δa)% of the actual set pressure, ..., the actual set pressure;

If the pressure-holding test of the safety valve to be tested is qualified, that is, the safety valve to be tested has pressure-holding performance, proceed to the next test, otherwise, terminate the test and report the reason for the termination of the test;

S26, perform a reseating pressure test on the safety valve to be tested:

S261, the numerical control center controls the gas path regulating device so that after the gas pressure in the second pressure vessel reaches the set pressure, close the gas path regulating device; wherein, the set pressure is the actual discharge pressure of the safety valve to be tested;

S262, the numerical control center opens the discharge device, and uses the discharge device to discharge the gas in the second pressure vessel, that is, reduce the pressure. The numerical control center judges the pressure drop in the second pressure vessel in real time according to the data collected by the pressure sensor on the second pressure vessel, Until the gas pressure in the second pressure vessel remains unchanged, that is, the pressure drop is 0, record the gas pressure in the second pressure vessel when the pressure drop is 0 at this time, and use it as the actual reseating pressure of the safety valve to be tested;

If the reseating pressure test of the safety valve to be tested is qualified, that is, the actual reseating pressure of the safety valve to be tested meets the error range of the calibration parameters, proceed to the next test, otherwise, terminate the test and report the reason for the termination of the test;

S27, conduct a pulse withstand voltage test on the safety valve to be tested:

S271, the numerical control center controls the gas path regulating device so that after the gas pressure in the second pressure vessel reaches the set pressure, close the gas path regulating device; wherein, the set pressure is the actual set pressure of the safety valve to be tested;

S272, the numerical control center opens the discharge device, and uses the discharge device to discharge the gas in the second pressure vessel until the gas pressure in the second pressure vessel is discharged to zero;

S273, loop steps S271-S272, after several cycles, judge whether the safety valve to be tested is damaged, the judgment method is:

According to the method of steps S24 and S26, re-conduct the discharge pressure test and reseating pressure test of the safety valve to be tested to obtain the set pressure, discharge pressure and reseating pressure of the safety valve to be tested at this time, that is, after the impulse withstand voltage test, and judge At this time, whether the set pressure, discharge pressure, and reseating pressure are within the error range of the calibration parameters, if the set pressure, discharge pressure, and reseating pressure are all within the error range of the calibration parameters, it means that the safety valve to be tested has pulse withstand pressure Otherwise, it means that the safety valve to be tested does not have impulse pressure resistance;

If the pulse withstand voltage test of the safety valve to be tested is qualified, that is, the safety valve to be tested has the pulse withstand voltage test, proceed to the next test, otherwise, terminate the test and report the reason for the termination of the test;

S28, conduct a reliability test on the safety valve to be tested:

S281, the numerical control center controls the temperature adjustment device to adjust the gas temperature in the second pressure vessel;

S282, according to steps S24-S27, at different gas temperatures, perform discharge pressure test, pressure holding test, reseating pressure test, and pulse pressure test of the safety valve to be tested in order to test the safety valve under test at different gas temperatures. Valve set pressure, discharge pressure, pressure retention, reseating pressure, pulse pressure resistance;

If the safety valve to be tested is qualified in all tests at different gas temperatures, the test is over; if the safety valve to be tested fails in a certain test at a certain gas temperature, the test is terminated and the reason for the termination of the test is reported.

Preferably, the working environment test of the safety valve to be tested is carried out on a comprehensive test bench, and the specific method is as follows:

S31, installing the safety valve to be tested on the safety valve test branch of the comprehensive test bench, and entering the factory parameters of the safety valve to be tested into the numerical control center as calibration parameters;

S32, connecting the input end of the booster device to a gas source, inputting gas into the booster device, and the numerical control center controls the booster device to input high-pressure gas into the first pressure vessel;

S33, the numerical control center opens the gas path regulating device, and inputs the high-pressure gas stored in the first pressure vessel into the second pressure vessel and the safety valve test branch;

S34, the numerical control center controls the environment adjustment chamber to adjust the working environment temperature of the safety valve to be tested;

S35, conduct various tests on the safety valve to be tested at various working environment temperatures, and test the working performance of the safety valve to be tested at different working environment temperatures

The advantages of the present invention are:

(1) The present invention can simulate different working temperatures and different working pressures of safety valves, and can also simulate different working environments of safety valves, so that the safety valves to be tested can be tested under different working temperatures, different working pressures and different working environments. Tests, including air tightness test, discharge pressure test, pressure holding test, reseating pressure test, pulse withstand voltage test, reliability test, working environment test, comprehensively test the working performance of the safety valve to be tested.

(2) The present invention uses a pressurizing device to fill the first pressure vessel with a scalar gas volume at one time, and then provides a test gas volume for the entire comprehensive test bench. Since the second pressure vessel is a small pressure vessel, which involves multiple deflation and inflation, a certain amount of high-pressure reference is reserved in the large pressure vessel, that is, the first pressure vessel, and the small pressure vessel can be continuously inflated later to avoid booster pump compressor frequently run.

(3) The present invention utilizes the cooler and the heater in the temperature adjustment device, so that the comprehensive test bench can simulate different working temperatures, so as to complete the working performance test of the safety valve to be tested under different working temperatures.

(4) In the present invention, the gas path regulating device is used to input gas into the second pressure vessel, the first regulating valve is used to roughly adjust the gas volume, and the second regulating valve is used to finely adjust the gas volume, so as to realize the precise adjustment of the gas pressure in the second pressure vessel, The comprehensive test bench can simulate different working pressures, so as to complete the working performance test of the safety valve to be tested under different working pressures.

(5) The present invention uses a gas purification device to purify the gas to reduce the influence of dust in the gas, improve the life of the comprehensive test bench, and reduce the measurement error of working performance parameters.

(6) The present invention can automatically complete the air tightness test of the safety valve to be tested based on the spray device, image acquisition device and target recognition.

(7) The present invention provides a comprehensive test method on the basis of a comprehensive test bench, including air tightness test, discharge pressure test, pressure holding test, reseating pressure test, pulse withstand voltage test, reliability test, and working environment test, The test items are comprehensive to ensure the comprehensive testing of the working performance of the safety valve to be tested.

Description of drawings

Fig. 1 is an overall schematic diagram of a comprehensive test bench for a safety valve of the present invention.

Explanation of reference signs:

1-First stop valve, 2-Boost pump, 3-Second stop valve, 4-Dust collector, 5-Oil remover, 6-Water remover, 7-First pressure vessel, 8-First temperature sensor , 9-first pressure sensor, 10-cooler, 11-heater, 12-third stop valve, 13-first one-way valve, 14-first regulating valve, 15-second regulating valve, 16-the first Two pressure vessels, 17-second temperature sensor, 18-second pressure sensor, 19-second one-way valve, 20-third regulating valve, 21-muffler, 22-fifth shut-off valve, 23-environmental adjustment chamber, 24-Second safety valve to be tested, 25-Fourth cut-off valve, 26-First safety valve to be tested, 27-Camera, 29-Liquid pump, 30-Third pressure sensor, 31 Spray head, 32-CNC center .

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

As shown in Fig. 1, a kind of comprehensive test bench for safety valve of the present invention comprises: pressurization device, gas purification device, first pressure vessel 7, temperature adjustment device, gas path adjustment device, second pressure vessel 16 , discharge device, safety valve test branch, safety valve to be tested, environment conditioning chamber 23, spraying device, image acquisition device, data acquisition circuit, device control circuit, data processing and control center, namely the numerical control center 32.

The pressurizing device includes a high-pressure gas circuit and a normal-pressure gas circuit connected in parallel. The high-pressure gas circuit is provided with a first shut-off valve 1 and a booster pump 2. The normal-pressure gas circuit is provided with a second shut-off valve 3. The high-pressure gas circuit and The parallel input end of the normal pressure gas circuit, that is, the input end of the booster device is used to input gas, and the parallel output end of the high pressure gas circuit and the normal pressure gas circuit, that is, the output end of the booster device is connected to the input end of the gas purification device; The high-pressure gas circuit is used to pressurize the gas.

The gas purification device includes a dust remover 4, an oil remover 5, and a water remover 6 sequentially connected along the gas transmission direction; the gas purification device is used to purify the gas, including dust removal, oil removal, and water removal.

The output end of the gas purification device, that is, the output end of the water eliminator 6, is connected to the input end of the first pressure vessel 7; the output end of the first pressure vessel 7 is connected to the input end of the temperature regulating device; The pressure vessel 7 is provided with a first temperature sensor 8 and a first pressure sensor 9 for measuring the gas temperature and gas pressure in the first pressure vessel 7 respectively; Finally, the test gas is provided for the whole test bench.

The temperature regulating device includes a cooler 10 and a heater 11 sequentially connected along the gas transmission direction; the temperature regulating device is used to adjust the gas temperature, that is, to adjust the inlet temperature of the safety valve to be tested, and to support the test bench to simulate different working temperatures , to complete the work performance test of the safety valve to be tested under different simulated working temperatures; the output end of the temperature adjustment device, that is, the output end of the heater 11, is connected to the input end of the gas path adjustment device.

The gas path regulating device includes a third cut-off valve 12, a first one-way valve 13, and a regulating valve assembly connected in sequence along the gas transmission direction; the regulating valve assembly includes a first regulating valve 14 and a second regulating valve connected in parallel 15. The input end of the first one-way valve 13 is connected to the output end of the third stop valve 12, and the output end of the first one-way valve 13 is connected to the input end of the regulating valve assembly, that is, the first regulating valve 14 and the second regulating valve 15 The parallel input port of the regulating valve assembly is connected, the output port of the regulating valve assembly, that is, the parallel output port of the first regulating valve 14 and the second regulating valve 15 is connected with the output port of the second pressure vessel 16; the first regulating valve 14 is used for For coarse air volume adjustment, the second regulating valve 15 is used for fine air volume adjustment. The gas path regulating device is used to adjust the working pressure of the safety valve to be tested, supports the test bench to simulate different pressure conditions, and completes the work performance test of the safety valve to be tested under the simulated different pressure conditions.

The first output end of the second pressure vessel 16 is connected to the input end of the discharge device; the discharge device includes a second one-way valve 19, a third regulating valve 20, and a muffler 21 connected in sequence along the gas transmission direction; The output end of the discharge device is used to discharge gas to the outside.

The second output end of the second pressure vessel 16 is connected with the input end of the safety valve test branch; the second pressure vessel 16 is provided with a second temperature sensor 17 and a second pressure sensor 18 for measuring The gas temperature and gas pressure in the second pressure vessel 16; the second pressure vessel 16 is used to provide test gas meeting the temperature and pressure conditions for single-type tests. The end of the safety valve test branch, that is, the output end, is connected to the safety valve to be tested.

In the present invention, the safety valve to be tested is placed in the environment adjustment chamber 23, and the environment adjustment chamber 23 is used to provide different working environment temperatures for the safety valve to be tested; or, the safety valve to be tested is equipped with a spray device and The image acquisition device, the spraying device is used to spray the leakage measurement liquid to the safety valve to be tested, and the image acquisition device is used to collect the surface image of the safety valve to be tested; or, the safety valve to be tested is placed in the environment adjustment chamber 23 And it is equipped with spraying device and image acquisition device.

In this embodiment, considering the size of the comprehensive test bench, since the spraying device and the image acquisition device occupy a relatively large space, the environmental adjustment chamber is not provided with the spraying device and the image acquisition device, but the environment adjustment unit is separately installed. As shown in Figure 1, the comprehensive test bench provides two safety valve test branches, namely the first safety valve test branch and the second safety valve test branch, for Simultaneously conduct different tests on the two safety valves to be tested.

The first safety valve test branch is provided with a fourth cut-off valve 25, and the end output end of the first safety valve test branch is connected with a first safety valve to be tested 26; the first safety valve to be tested 26 is equipped with a spray Showering device and image acquisition device. The first safety valve test branch is used for air tightness test, discharge pressure test, pressure holding test, reseating pressure test, pulse withstand voltage test and reliability test of the first safety valve 26 to be tested.

A fifth cut-off valve 22 is arranged on the second safety valve test branch, and a second safety valve 24 to be tested is connected to the output end of the second safety valve test branch; the second safety valve 24 to be tested is equipped with an environment regulating The chamber 23, that is, the second safety valve to be tested 24 is located in the environment adjustment chamber 23, and the environment adjustment chamber 23 provides the working environment temperature of -40°C to +65°C for the second safety valve to be tested 24, which is used to simulate the scorching sun and The severe cold extreme working environment can test the working performance of the second safety valve 24 to be tested in the extreme working environment. The second safety valve test branch is used for discharge pressure test, pressure holding test, reseating pressure test, pulse withstand voltage test and reliability test of the second safety valve 24 to be tested under extreme working environment.

In this embodiment, when the air tightness test, discharge pressure test, pressure holding test, reseating pressure test, pulse withstand voltage test, and reliability test are sequentially performed on the first safety valve 26 to be tested, the fourth shut-off valve 25 is opened. And close the fifth stop valve 22 . When the discharge pressure test, pressure holding test, reseating pressure test, pulse withstand pressure test, and reliability test are carried out in sequence for the second safety valve 24 to be tested at various working environment temperatures, the fourth stop valve 25 is closed and the fifth stop valve is opened. Stop valve 22.

The spraying device includes a liquid storage tank 28, a liquid pump 29, a third pressure sensor 30, and a spray head 31 connected in sequence along the liquid flow direction; the liquid storage tank 28 is used to store leakage measurement liquid, and the liquid The pump 29 is used to adjust the hydraulic pressure, the third pressure sensor 30 is used to measure the hydraulic pressure, and the spray head 31 is located above the safety valve to be tested for spraying the safety valve to be tested. Specifically, the leakage measurement liquid is a solution added with a surfactant component, such as soapy water and the like.

The camera 27 of the image acquisition device is arranged on the side of the safety valve to be tested, and is rotated and displaced along the safety valve to be tested, and is used to collect surface images of various angles of the safety valve to be tested; specifically, the image acquisition device utilizes a guide rail The mechanism provides the camera 27 with the capability of rotational displacement.

Described data acquisition circuit is used for first temperature sensor 8, the first pressure sensor 9, the second temperature sensor 17, the second pressure sensor 18, the 3rd pressure sensor 30 are connected with numerical control center 32 respectively, the acquisition data of each sensor Sent to the numerical control center 32.

The device control circuit is used to control the first cut-off valve 1, the booster pump 2, the second cut-off valve 3, the dust collector 4, the oil remover 5, the water remover 6, the cooler 10, the heater 11, the third cut-off valve The valve 12, the first regulating valve 14, the second regulating valve 15, the third regulating valve 20, the fourth shut-off valve 25, the fifth shut-off valve 22, the environment regulating chamber 23, and the liquid pump 29 are respectively connected with the numerical control center 32, and the numerical control The center 32 controls each controlled object.

According to the comprehensive test bench provided by the present invention, comprehensive tests are carried out on the safety valve to be tested, including: air tightness test, discharge pressure test, pressure holding test, reseating pressure test, pulse withstand voltage test, reliability test, and working environment test.

In this embodiment, the airtightness test of the first safety valve 26 to be tested on the first safety valve test branch road is carried out using a comprehensive test bench, and the specific method is as follows:

S11, install the first safety valve 26 to be tested on the first safety valve test branch of the comprehensive test bench, and input the factory parameters of the first safety valve 26 to be tested into the numerical control center 32 as calibration parameters, including: nominal pressure, working Pressure, set pressure, discharge pressure, reseating pressure, pressure rating, flow channel diameter, working environment temperature range. In the liquid storage tank 28, pour the leakage measurement liquid of the standard scale line amount. In the initial state, each valve on the test bench is closed, and each device is not in operation.

Among them, the nominal pressure refers to the maximum allowable pressure of the safety valve body, such as PN16, PN25, PN40, PN64. Working pressure refers to: the normal pressure that the safety valve body itself can bear. The set pressure refers to: the predetermined pressure when the valve disc of the safety valve starts to open under operating conditions, which is the gauge pressure measured at the valve inlet, that is, the pressure for the opening action of the safety valve. When this pressure value is reached or exceeded, the safety valve will Opening is a value set artificially, generally 1.05-1.1 times the maximum working pressure, which is a safe value that is higher than the normal working pressure of the equipment and smaller than the design pressure of the equipment. Discharge pressure refers to: set pressure plus overpressure (overpressure refers to the pressure increase over the set pressure of the safety valve, usually expressed as a percentage of the set pressure), that is, the inlet pressure and discharge pressure when the disc reaches the specified opening height. The upper limit shall be subject to the requirements of relevant national standards or norms. The reseating pressure refers to the inlet pressure when the disc re-presses the valve seat after the safety valve is discharged, and the medium stops being discharged. The reseating pressure is an important parameter that characterizes the quality of the safety valve. The diameter of the flow channel refers to the diameter of the minimum cross-sectional area of the flow channel between the inlet end of the disc and the sealing surface of the closing member.

S12, connect the input end of the supercharging device to the gas source, and input gas to the supercharging device. If it is a high-pressure gas source, the numerical control center 32 opens the second cut-off valve 3. At this time, the first cut-off valve 1 and the booster pump 2 are Closed state; if it is a normal pressure gas source, then the numerical control center 32 opens the first shut-off valve 1 and the booster pump 2, and the second shut-off valve 3 is in the closed state at this moment; at the same time, the numerical control center 32 opens the dust collector 4 and the degreaser 5. The water eliminator 6, the high-pressure gas flowing out of the supercharging device is purified by the gas purification device and then enters the first pressure vessel 7, and the high-pressure gas is input into the first pressure vessel 7, and the third stop valve 12 is closed at this time ; In the inflation process of the first pressure vessel 7, the numerical control center 32 adjusts and controls the second shut-off valve 3, the first shut-off valve 1, the booster pump 2 according to the collected data of the first pressure vessel 9, until the first pressure vessel 7 After the gas pressure inside reaches the working pressure, the input of gas to the pressurization device is stopped, and the high-pressure gas stored in the first pressure vessel 7 is directly used as the test gas source in subsequent tests.

S13, the numerical control center 32 opens the third cut-off valve 12, the first regulating valve 14, and the second regulating valve 15. In this embodiment, since the first safety valve 26 to be tested is subjected to an air tightness test, the numerical control center 32 also opens The fourth stop valve 25 and the fifth stop valve 22 are closed. Input the high-pressure gas stored in the first pressure vessel 7 into the second pressure vessel 16 and the first safety valve test branch, and receive the collected data of the second pressure vessel 18 at the same time, according to the gas pressure in the second pressure vessel 16, step by step Adjust the opening of the first regulating valve 14 and the second regulating valve 15 until the gas pressure in the second pressure vessel 16 reaches 90% of the factory set pressure, for testing the first safety valve 26 to be tested when the gas pressure is 90% Airtightness under factory set pressure. The numerical control center 32 closes the third stop valve 12 , the first regulating valve 14 and the second regulating valve 15 .

S14, the numerical control center 32 turns on the liquid pump 29, and adjusts the pumping speed of the liquid pump 29 until the hydraulic pressure value measured by the third pressure sensor 30 reaches the calibration value. At this time, the leakage measurement liquid stored in the liquid storage tank 28 passes through the The spray head 31 sprays the first safety valve 26 to be tested, and the liquid pump 29 is turned off after the surface of the first safety valve 26 to be tested is soaked with the leakage measurement liquid.

S15, the numerical control center 32 controls the camera 27 of the image acquisition device to take pictures, and performs rotational displacement along the first safety valve 26 to be tested, and collects surface images of the first safety valve 26 to be tested at various angles at the current moment, that is, at time T1, and sent to the numerical control center 32; the numerical control center 32 recognizes the surface images of each angle, recognizes the bubbles in the surface images of each angle, and counts the number of bubbles in the surface images of each angle under the time T1, and the center of circle of each bubble location and circumference.

S16, after an interval of Δt, collect the surface images of the first safety valve 26 to be tested at various angles at the current moment, that is, at time T2, and count the number of bubbles in the surface images at each angle at time T2, and the center of each bubble location and circumference. Among them, T2=T1+Δt.

S17, the numerical control center 32 compares and analyzes the surface images at the same angle at the two moments before and after the first safety valve 26 to be tested according to the surface images at various angles at the two moments before and after, that is, at time T1 and time T2:

If the number of bubbles in the surface image at time T2 increases compared with the number of bubbles in the surface image at time T1, and the number of bubbles increases exceeds the set threshold, it means that the first safety valve 26 to be tested is at 90% of the factory set pressure Air leakage occurs at the bottom; if the circumference of a certain bubble in the surface image at time T2 is larger than the circumference of the bubble at the corresponding position in the surface image at time T1, and the increase value of the circumference exceeds the set threshold, it means that the first waiting time The measured safety valve 26 leaks under 90% of the factory set pressure; otherwise, it means that the first safety valve 26 to be tested does not leak under 90% of the factory set pressure.

S18, the numerical control center 32 controls the gas path regulating device to pressurize the second pressure vessel 16, so that the gas pressure in the second pressure vessel 16 increases by 2% each time until the pressurization reaches the factory set pressure, and follow steps S14-S17 In this way, the airtightness of the first safety valve 26 to be tested under 92%, 94%, 96%, 98%, and 100% of the factory set pressure is respectively tested.

S19, the numerical control center 32 controls the temperature regulating device, adjusts the gas temperature in the second pressure vessel 16, and tests the airtightness of the first safety valve 26 to be tested at different gas temperatures according to steps S14-S18.

If the airtightness test of the first safety valve 26 to be tested is qualified, then proceed to the next test; otherwise, the test is terminated and the reason for the test termination is reported.

In this embodiment, the first safety valve 26 to be tested on the first safety valve test branch road is sequentially subjected to a discharge pressure test, a pressure holding test, a reseating pressure test, a pulse withstand voltage test, and a reliability test using a comprehensive test bench. The method looks like this:

S21, install the first safety valve 26 to be tested on the first safety valve test branch of the comprehensive test bench, and input the factory parameters of the first safety valve 26 to be tested into the numerical control center 32 as calibration parameters, including: nominal pressure, working Pressure, set pressure, discharge pressure, reseating pressure, pressure rating, flow channel diameter, working environment temperature range. In the initial state, each valve on the test bench is closed, and each device is not in operation.

S22, connect the input end of the supercharging device to the gas source, input gas to the supercharging device, at the same time, the numerical control center 32 opens the gas purification device, and the high-pressure gas flowing out of the supercharging device enters the first pressure vessel 7 after being purified, and flows to the first pressure vessel 7. Input high-pressure gas into the first pressure vessel 7, until the gas pressure in the first pressure vessel 7 reaches the working pressure, stop inputting gas to the booster device, and directly use the high-pressure gas stored in the first pressure vessel 7 as the Test air source.

S23, the numerical control center 32 opens the gas path regulating device, and opens the fourth shut-off valve 25, and the fifth shut-off valve 22 is closed, and the high-pressure gas stored in the first pressure vessel 7 is input to the second pressure vessel 16 and the first pressure vessel 16. Safety valve test branch.

S24, performing a discharge pressure test on the first safety valve 26 to be tested:

S241, the numerical control center 32 controls the gas path regulating device, pressurizes the second pressure vessel 16, and closes the gas path regulating device after the gas pressure in the second pressure container 16 reaches 90% of the factory set pressure.

S242, the numerical control center 32 controls the gas path regulating device to continue to pressurize the second pressure vessel 16. At this time, the pressurization speed is lower than the pressurization speed of step S241, and the gas pressure in the second pressure vessel 16 can be adjusted every interval. Increase the pressure by 1%. In this process, the numerical control center 32 judges the pressure drop in the second pressure vessel 16 in real time according to the collected data of the second pressure sensor 18 on the second pressure vessel 16. If the pressure drop rate exceeds the set Set the threshold, that is, the first sharp drop in pressure occurs, then record the gas pressure in the second pressure vessel 16 when the first pressure drop rate exceeds the set threshold, and use it as the first safety valve 26 to be tested. Actual set pressure; otherwise, continue to pressurize until the pressure drop rate exceeds the set threshold for the first time, and obtain the actual set pressure of the first safety valve 26 to be tested.

S243, after the pressure drop rate exceeds the set threshold for the first time, the numerical control center 32 controls the gas path adjustment device to continue to pressurize the second pressure vessel 16, and at this time the pressurization speed is lower than the pressurization speed of step S241, and the pressurization speed can be adopted The pressure of the gas in the second pressure vessel 16 is increased by 1% at regular intervals. During this process, the numerical control center 32 judges the pressure in the second pressure vessel 16 in real time according to the data collected by the second pressure sensor 18. If the rate of pressure drop exceeds the set threshold, that is, there is a sharp drop in pressure for the second time, record the gas pressure in the second pressure vessel 16 when the rate of pressure drop exceeds the set threshold for the second time, and use it as The actual discharge pressure of the first safety valve 26 to be tested; otherwise, continue to pressurize until the second pressure drop rate exceeds the set threshold to obtain the actual discharge pressure of the first safety valve 26 to be tested.

If the discharge pressure test of the first safety valve 26 to be tested is qualified, that is, the actual discharge pressure and the actual set pressure of the first safety valve 26 to be tested meet the calibration parameter range, then proceed to the next test; otherwise, terminate the test and report the reason for the termination of the test .

S25, performing a pressure-holding test on the first safety valve 26 to be tested:

S251, the numerical control center 32 controls the gas path regulating device so that the gas pressure in the second pressure vessel 16 reaches 90% of the set pressure of the actual set pressure, and then closes the gas path regulating device for testing the first safety valve 26 to be tested. Holding performance at 90% of actual set pressure.

S252, the numerical control center 32 judges the pressure drop in the second pressure vessel 16 in real time according to the collected data of the second pressure sensor 18 on the second pressure vessel 16, if the pressure drop rate exceeds the set threshold, or the pressure drop exceeds The set value means that the first safety valve 26 to be tested does not maintain pressure under 90% of the factory set pressure; otherwise, it means that the first safety valve 26 to be tested is maintained under 90% of the actual set pressure. In the present invention, if the pressure is not maintained, the reason for the failure to maintain the pressure can be found in combination with the air tightness test.

S253, after a period of time, the numerical control center 32 controls the gas path regulating device to pressurize the second pressure vessel 16, so that the gas pressure in the second pressure vessel 16 increases by 2% each time, until the pressure reaches the factory set pressure , and according to the method of step S252, respectively test the pressure-holding properties of the first safety valve 26 to be tested at 92%, 94%, 96%, 98%, and 100% of the actual set pressure.

If the pressure-holding test of the first safety valve 26 to be tested is qualified, that is, the pressure-holding performance meets the calibration parameter range, the next test is performed; otherwise, the test is terminated and the reason for the termination of the test is reported.

S26, performing a reseating pressure test on the first safety valve 26 to be tested:

S261, the numerical control center 32 controls the gas path regulating device so that the gas pressure in the second pressure vessel 16 reaches the set pressure, and then closes the gas path regulating device; wherein, the set pressure is the actual discharge pressure of the first safety valve 26 to be tested .

S262, the numerical control center 32 opens the discharge device, and uses the discharge device to discharge the gas in the second pressure vessel 16, that is, reduce the pressure. The method of discharging 1% of the gas pressure in the second pressure vessel 16 at intervals can be used to reduce the pressure. According to the collected data of the second pressure sensor 18, the numerical control center 32 judges the pressure drop in the second pressure vessel 16 in real time until the first time the gas pressure in the second pressure vessel 16 remains constant, i.e. the pressure drop is 0, record this The gas pressure in the second pressure vessel 16 when the pressure drop is 0 occurs at that time, and is used as the actual reseating pressure of the first safety valve 26 to be tested.

If the reseating pressure test of the first safety valve 26 to be tested is qualified, that is, the actual reseating pressure of the first safety valve 26 to be tested meets the calibration parameter range, the next test is performed; otherwise, the test is terminated and the reason for the termination of the test is reported.

S27, performing a pulse withstand voltage test on the first safety valve 26 to be tested:

S271, the numerical control center 32 controls the gas path regulating device so that after the gas pressure in the second pressure vessel 16 reaches the set pressure, close the gas path regulating device; wherein, the set pressure is the actual set pressure of the first safety valve 26 to be tested .

S272, the numerical control center 32 opens the discharge device, and uses the discharge device to discharge the gas in the second pressure vessel 16 until the gas pressure in the second pressure vessel 16 is discharged to zero.

S273, loop steps S271-S272, after several cycles, judge whether the first safety valve 26 to be tested is damaged, the judgment method is:

According to the method of steps S24 and S26, carry out the discharge pressure test and the reseating pressure test on the first safety valve 26 to be tested again, and obtain the set pressure and discharge pressure of the first safety valve 26 to be tested at this time after the impulse withstand voltage test. , reseating pressure, and judge whether the set pressure, discharge pressure, and reseating pressure are within the range of the calibration parameters at this time. If the set pressure, discharge pressure, and reseating pressure are all within the range of the calibration parameters, it means that the first waiting The tested safety valve 26 has impulse pressure resistance; otherwise, it means that the first safety valve 26 to be tested does not have impulse pressure resistance.

If the pulse withstand voltage test of the first safety valve 26 to be tested is qualified, then proceed to the next test; otherwise, terminate the test and report the reason for the termination of the test.

S28, performing a reliability test on the first safety valve 26 to be tested:

S281, the numerical control center 32 controls the temperature adjustment device to adjust the gas temperature in the second pressure vessel 16 .

S282, according to steps S24-S27, at different gas temperatures, sequentially perform a discharge pressure test, a pressure holding test, a reseating pressure test, and a pulse withstand voltage test on the first safety valve 26 to be tested, and test The set pressure, discharge pressure, pressure holding performance, reseating pressure and pulse pressure resistance of the safety valve to be tested.

If the reliability test of the first safety valve 26 to be tested is qualified, proceed to the next test; otherwise, terminate the test and report the reason for the termination of the test.

In this embodiment, the second safety valve to be tested 24 on the second safety valve test branch is used to carry out the working environment test on the comprehensive test bench, and the specific method is as follows:

S31, install the second safety valve 24 to be tested on the second safety valve test branch of the comprehensive test bench, and input the factory parameters of the second safety valve 24 to be tested into the numerical control center 32 as calibration parameters, including: nominal pressure, working Pressure, set pressure, discharge pressure, reseating pressure, pressure rating, flow channel diameter, working environment temperature range. In the initial state, each valve on the test bench is closed, and each device is not in operation.

S32, connect the input end of the supercharging device to the gas source, input gas to the supercharging device, at the same time, the numerical control center 32 opens the gas purification device, and the high-pressure gas flowing out of the supercharging device enters the first pressure vessel 7 after being purified, and flows to the first pressure vessel 7. Input high-pressure gas into the first pressure vessel 7, until the gas pressure in the first pressure vessel 7 reaches the working pressure, stop inputting gas to the booster device, and directly use the high-pressure gas stored in the first pressure vessel 7 as the Test air source.

S33, the numerical control center 32 opens the gas path regulating device, and opens the fifth shut-off valve 22, and the fourth shut-off valve 25 is closed, and the high-pressure gas stored in the first pressure vessel 7 is input to the second pressure vessel 16 and the second pressure vessel 16. Safety valve test branch.

S34, the numerical control center 32 controls the environment adjustment chamber 23, adjusts the working environment temperature of the second safety valve 24 to be tested, and divides the temperature range according to 5°C, divides -40°C～+65°C into 21 temperature ranges, and obtains 21 a working environment temperature.

S35, according to the method of steps S24-S28, carry out various tests on the second safety valve 24 to be tested at each working environment temperature, including discharge pressure test, pressure holding test, reseating pressure test, pulse withstand pressure test, reliable Performance test, testing the working performance of the second safety valve 24 to be tested under different working ambient temperatures.

In the present invention, the numerical control center 32 also generates a test report of the safety valve to be tested according to the results of various tests. At the same time, the operator can flexibly adjust the test parameters, test items, test sequence, etc. according to the type of safety valve to be tested and the requirements of the use environment. For example, the discharge pressure test can be carried out on the first safety valve 26 to be tested on the first safety valve test branch, after obtaining the actual set pressure, and then the airtightness test is carried out on the first safety valve 26 to be tested. During the test, the actual set pressure is used as the standard to test the airtightness of the first safety valve 26 to be tested at 92%, 94%, 96%, 98%, and 100% of the actual set pressure, and then the first to be tested The safety valve 26 is subjected to a pressure holding test, a reseating pressure test, a pulse withstand voltage test, and a reliability test. The operator can also first install a certain safety valve to be tested on the first safety valve test branch, and first conduct air tightness test, pressure holding test, reseating pressure test, pulse withstand pressure test, and reliability test on the safety valve to be tested. After the performance test, after all the tests are qualified, then install the safety valve to be tested on the second safety valve test branch road, and then carry out the working environment test on the safety valve to be tested, that is, conduct various tests on the safety valve to be tested. Discharge pressure test, pressure holding test, reseating pressure test, pulse withstand voltage test, and reliability test at the working environment temperature.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the present invention. within the scope of protection.

Claims (10)

1. A comprehensive test bench for a safety valve, characterized in that the comprehensive test bench includes: a pressurizing device connected in sequence along the gas transmission direction, a first pressure vessel (7), a temperature regulating device, a gas path regulating device, The second pressure vessel (16), the safety valve test branch, and the safety valve to be tested; The pressurization device is used to pressurize the gas and input the pressurized gas into the first pressure vessel (7); the temperature adjustment device is used to adjust the temperature of the gas flowing into the second pressure vessel (16) ; The gas path regulating device is used to adjust the flow of gas flowing into the second pressure vessel (16); the second pressure vessel (16) is used to store the gas with a set pressure and a set temperature for the test Safety valve test; the safety valve to be tested is connected to the second pressure vessel (16) through a safety valve test branch; The second pressure vessel (16) is also connected to a discharge device, and the discharge device is used to discharge the gas in the second pressure vessel (16); Both the first pressure vessel (7) and the second pressure vessel (16) are provided with a temperature sensor and a pressure sensor for collecting the gas temperature and gas pressure in the pressure vessel; The comprehensive test bench also includes an environment adjustment chamber (23), the safety valve to be tested is placed in the environment adjustment chamber (23), and the environment adjustment chamber (23) is used to provide different working environment temperatures for the safety valve to be tested; The comprehensive test bench also includes a spraying device and an image acquisition device, the spraying device is used to spray the leakage measurement liquid to the safety valve to be tested, and the image acquisition device is used to collect the surface image of the safety valve to be tested; The comprehensive test bench also includes a numerical control center (32), the numerical control center (32) is connected with each sensor, and is used to receive the collected data of each sensor; the numerical control center (32) is also connected with each device, with to control each device. 2. A kind of comprehensive test bench for safety valve according to claim 1, characterized in that, the pressurization device comprises a high-pressure gas circuit and a normal-pressure gas circuit connected in parallel, and the high-pressure gas circuit is provided with a first cut-off Valve (1) and booster pump (2), the second cut-off valve (3) is provided on the normal pressure gas line; the discharge device includes a second one-way valve (19) connected in sequence along the gas transmission direction, a third regulator Valve (20), muffler (21). 3. A comprehensive test bench for safety valves according to claim 1, characterized in that the temperature adjustment device includes a cooler (10) and a heater (11). 4. A comprehensive test bench for safety valves according to claim 1, characterized in that the gas path adjustment device includes a third cut-off valve (12) sequentially connected along the gas transmission direction, a first one-way Valve (13), regulating valve assembly; the regulating valve assembly includes a first regulating valve (14) and a second regulating valve (15) connected in parallel; the first regulating valve (14) and the second regulating valve (15 ) are used to adjust the air volume, and the adjustment precision of the first regulating valve (14) is smaller than that of the second regulating valve (15). 5. A comprehensive test bench for safety valves according to claim 1, characterized in that the spray device includes a liquid storage tank (28), a liquid pump (29), The third pressure sensor (30), spray head (31); the liquid storage tank (28) is used to store leakage measurement liquid, the liquid pump (29) is used to adjust the hydraulic pressure, and the third pressure sensor ( 30) is used for measuring hydraulic pressure, and the spray head (31) is located above the safety valve to be tested, and is used for spraying the safety valve to be tested. 6. A comprehensive test bench for safety valves according to claim 1, characterized in that the camera (27) of the image acquisition device is set on the side of the safety valve to be tested, and along the The surface of the safety valve is rotated and displaced to collect surface images at various angles of the safety valve to be tested. 7. A comprehensive test bench for safety valves according to claim 1, characterized in that the comprehensive test bench also includes a gas purification device for purifying the gas input into the first pressure vessel (7) The purification process includes dust removal, oil removal, and water removal; the gas purification device includes a dust remover (4), an oil remover (5), and a water remover (6) sequentially connected along the gas transmission direction. 8. be applicable to the comprehensive test method of a kind of comprehensive test bench that is used for safety valve as claimed in claim 1, it is characterized in that, utilize comprehensive test bench to carry out airtightness test of safety valve to be tested, concrete method is as follows: S11, installing the safety valve to be tested on the safety valve test branch of the comprehensive test bench, and entering the factory parameters of the safety valve to be tested into the numerical control center (32) as calibration parameters; S12, connect the input end of the booster device to a gas source, input gas to the booster device, and the numerical control center (32) controls the booster device to input high-pressure gas into the first pressure vessel (7); S13, the numerical control center (32) opens the gas path regulating device, and inputs the high-pressure gas stored in the first pressure vessel (7) into the second pressure vessel (16) and the safety valve test branch, by controlling the gas path regulating device, After adjusting the gas pressure in the second pressure vessel (16) to the set pressure, close the gas path regulating device; wherein, the set pressure is A% of the factory set pressure of the safety valve to be tested; S14, the numerical control center (32) turns on the spraying device, sprays the leakage measurement liquid to the safety valve to be tested, and closes the spraying device after the surface of the safety valve to be tested is infiltrated with the leakage measurement liquid; S15, the CNC center (32) turns on the image acquisition device, collects the surface image of the safety valve to be tested at the current moment, that is, the time T1, and sends the surface image of the safety valve to be tested at the time T1 to the CNC center (32); S16, after an interval of Δt, collect the surface image of the safety valve to be tested at the current time, that is, the time T2, and send the surface image of the safety valve to be tested at the time T2 to the CNC center (32); T2=T1+Δt; S17, the numerical control center (32) compares and analyzes the surface images of the safety valve to be tested at two moments before and after, that is, at time T1 and time T2: Count the number of bubbles in the surface image at two moments before and after, as well as the position and circumference of each bubble. If the number of bubbles in the surface image at time T2 is greater than the number of bubbles in the surface image at time T1, or, the surface image at time T2 If the circumference of a certain bubble in the image is greater than the circumference of the bubble at the corresponding position in the surface image at time T1, it means that the safety valve to be tested leaks at A% of the factory set pressure; otherwise, it means that the safety valve to be tested is at A There is no air leakage under the factory set pressure of %; S18, the numerical control center (32) controls the air path regulating device to pressurize the second pressure vessel (16), so that the gas pressure in the second pressure vessel (16) increases by Δa% each time until the pressurization reaches the factory set pressure, And according to the method of steps S14-S17, respectively test the factory set pressure of the safety valve to be tested at (A+Δa)% of the factory set pressure, (A+2Δa)% of the factory set pressure, (A+3Δa)% of the factory set pressure, ..., the airtightness under the factory set pressure; S19, the numerical control center (32) controls the temperature adjustment device, adjusts the gas temperature in the second pressure vessel (16), and tests the airtightness of the safety valve to be tested at different gas temperatures according to steps S14-S18. 9. The comprehensive test method applicable to a comprehensive test bench for safety valves as claimed in claim 1 is characterized in that, the comprehensive test bench is used to carry out discharge pressure test, pressure holding test and reseat pressure successively for the safety valve to be tested. Test, pulse withstand voltage test, reliability test, the specific methods are as follows: S21, installing the safety valve to be tested on the safety valve test branch of the comprehensive test bench, and entering the factory parameters of the safety valve to be tested into the numerical control center (32) as calibration parameters; S22, connect the input end of the booster device to a gas source, input gas to the booster device, and the numerical control center (32) controls the booster device to input high-pressure gas into the first pressure vessel (7); S23, the numerical control center (32) opens the gas path regulating device, and inputs the high-pressure gas stored in the first pressure vessel (7) into the second pressure vessel (16) and the safety valve test branch; S24, conduct a discharge pressure test on the safety valve to be tested: S241, the numerical control center (32) controls the gas path regulating device, pressurizes the second pressure vessel (16), and after the gas pressure in the second pressure container (16) reaches the set pressure, closes the gas path regulating device; wherein , the set pressure is A% of the factory set pressure of the safety valve to be tested; S242, the numerical control center (32) controls the air path regulating device to continue to pressurize the second pressure vessel (16), and at this time the pressurization speed is lower than the pressurization speed in step S241, the numerical control center (32) according to the second pressure vessel ( 16) The data collected by the upper pressure sensor is used to judge the pressure drop in the second pressure vessel (16) in real time. If the pressure drop rate exceeds the set threshold, record the time when the first pressure drop rate exceeds the set threshold. The gas pressure in the second pressure vessel (16), and take the gas pressure in the second pressure vessel (16) as the actual set pressure of the safety valve to be tested; otherwise, continue increasing the pressure until the first pressure appears The drop rate exceeds the set threshold, and the actual set pressure of the safety valve to be tested is obtained; S243, after the first pressure drop rate exceeds the set threshold, the numerical control center (32) controls the gas path adjustment device to continue to pressurize the second pressure vessel (16), and at this time the pressurization speed is lower than the pressurization in step S241 Speed, the numerical control center (32) judges the pressure drop in the second pressure vessel (16) in real time according to the collected data of the pressure sensor on the second pressure vessel (16), if the pressure drop rate exceeds the set threshold, record the current That is, the gas pressure in the second pressure vessel (16) when the second pressure drop rate exceeds the set threshold, and the gas pressure in the second pressure vessel (16) at this time is taken as the actual discharge of the safety valve to be tested Otherwise, continue to pressurize until the second pressure drop rate exceeds the set threshold to obtain the actual discharge pressure of the safety valve to be tested; If the discharge pressure test of the safety valve to be tested is qualified, that is, the actual discharge pressure and the actual set pressure of the safety valve to be tested all meet the error range of the calibration parameters, proceed to the next test, otherwise terminate the test and report the reason for the termination of the test; S25, conduct a pressure-holding test on the safety valve to be tested: S251, the numerical control center (32) controls the gas path regulating device so that the gas pressure in the second pressure vessel (16) reaches the set pressure, and then closes the gas path regulating device; wherein, the set pressure is the actual setting of the safety valve to be tested A% of pressure; S252, the numerical control center (32) judges the pressure drop in the second pressure vessel (16) in real time according to the data collected by the pressure sensor on the second pressure vessel (16), if the pressure drop rate exceeds the set threshold or within a specified time If the pressure drop exceeds the set value, it means that the safety valve to be tested does not maintain pressure at A% of the actual set pressure; otherwise, it means that the safety valve to be tested is maintained at A% of the factory set pressure; S253, the numerical control center (32) controls the air path regulating device to pressurize the second pressure vessel (16), so that the gas pressure in the second pressure vessel (16) increases by Δa% each time until the pressurization reaches the actual set pressure, And according to the method of step S252, respectively test the pressure holding performance of the safety valve to be tested at (A+Δa)% of the actual set pressure, (A+2Δa)% of the actual set pressure, ..., the actual set pressure; If the pressure-holding test of the safety valve to be tested is qualified, that is, the safety valve to be tested has pressure-holding performance, proceed to the next test, otherwise, terminate the test and report the reason for the termination of the test; S26, perform a reseating pressure test on the safety valve to be tested: S261, the numerical control center (32) controls the gas path regulating device so that the gas pressure in the second pressure vessel (16) reaches the set pressure, and then closes the gas path regulating device; wherein, the set pressure is the actual discharge of the safety valve to be tested pressure; S262, the numerical control center (32) opens the discharge device, and uses the discharge device to discharge the gas in the second pressure vessel (16), that is, reduce the pressure, and the numerical control center (32) collects data according to the pressure sensor on the second pressure vessel (16) , judge the pressure drop in the second pressure vessel (16) in real time until the gas pressure in the second pressure vessel (16) remains constant, that is, the pressure drop is 0, and record the second pressure drop when the pressure drop is 0 at this time. The gas pressure in the pressure vessel (16) is used as the actual reseating pressure of the safety valve to be tested; If the reseating pressure test of the safety valve to be tested is qualified, that is, the actual reseating pressure of the safety valve to be tested meets the error range of the calibration parameters, proceed to the next test, otherwise, terminate the test and report the reason for the termination of the test; S27, conduct a pulse withstand voltage test on the safety valve to be tested: S271, the numerical control center (32) controls the gas path regulating device so that the gas pressure in the second pressure vessel (16) reaches the set pressure, and then closes the gas path regulating device; wherein, the set pressure is the actual setting of the safety valve to be tested pressure; S272, the numerical control center (32) opens the discharge device, and uses the discharge device to discharge the gas in the second pressure vessel (16) until the gas pressure in the second pressure vessel (16) is discharged to zero; S273, loop steps S271-S272, after several cycles, judge whether the safety valve to be tested is damaged, the judgment method is: According to the method of steps S24 and S26, re-conduct the discharge pressure test and reseating pressure test of the safety valve to be tested to obtain the set pressure, discharge pressure and reseating pressure of the safety valve to be tested at this time, that is, after the impulse withstand voltage test, and judge At this time, whether the set pressure, discharge pressure, and reseating pressure are within the error range of the calibration parameters, if the set pressure, discharge pressure, and reseating pressure are all within the error range of the calibration parameters, it means that the safety valve to be tested has pulse withstand pressure Otherwise, it means that the safety valve to be tested does not have impulse pressure resistance; If the pulse withstand voltage test of the safety valve to be tested is qualified, that is, the safety valve to be tested has the pulse withstand voltage test, proceed to the next test, otherwise, terminate the test and report the reason for the termination of the test; S28, conduct a reliability test on the safety valve to be tested: S281, the numerical control center (32) controls the temperature adjustment device to adjust the gas temperature in the second pressure vessel (16); S282, according to steps S24-S27, at different gas temperatures, perform discharge pressure test, pressure holding test, reseating pressure test, and pulse pressure test of the safety valve to be tested in order to test the safety valve under test at different gas temperatures. Valve set pressure, discharge pressure, pressure retention, reseating pressure, pulse pressure resistance; If the safety valve to be tested is qualified in all tests at different gas temperatures, the test is over; if the safety valve to be tested fails in a certain test at a certain gas temperature, the test is terminated and the reason for the termination of the test is reported. 10. be applicable to the comprehensive test method of a kind of comprehensive test bench for safety valve described in claim 1, it is characterized in that, utilize comprehensive test bench to carry out working environment test for safety valve to be tested, concrete method is as follows: S31, installing the safety valve to be tested on the safety valve test branch of the comprehensive test bench, and entering the factory parameters of the safety valve to be tested into the numerical control center (32) as calibration parameters; S32, connect the input end of the booster device to the gas source, input gas to the booster device, and the numerical control center (32) controls the booster device to input high-pressure gas into the first pressure vessel (7); S33, the numerical control center (32) opens the gas path regulating device, and inputs the high-pressure gas stored in the first pressure vessel (7) into the second pressure vessel (16) and the safety valve test branch; S34, the numerical control center (32) controls the environment adjustment chamber (23), and adjusts the working environment temperature of the safety valve to be tested; S35, performing various tests on the safety valve to be tested at various working environment temperatures, and testing the working performance of the safety valve to be tested at different working environment temperatures.

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