CN112326154B - Test device and test method for rapid exhaust valve for air bag type pantograph - Google Patents
Test device and test method for rapid exhaust valve for air bag type pantograph Download PDFInfo
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- CN112326154B CN112326154B CN202011059793.6A CN202011059793A CN112326154B CN 112326154 B CN112326154 B CN 112326154B CN 202011059793 A CN202011059793 A CN 202011059793A CN 112326154 B CN112326154 B CN 112326154B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2876—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for valves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/003—Machine valves
Abstract
A test device and a test method for a quick exhaust valve for an air bag type pantograph are disclosed, the device comprises an air inlet pipeline, an air detection pipeline, an exhaust pipeline and a PLC (programmable logic controller), wherein one end of the air inlet pipeline is used for connecting an air source, the other end of the air inlet pipeline is used for connecting an air inlet of the quick exhaust valve, and an air inlet electromagnetic valve, an air filter, a pressure regulating valve, an air inlet pressure sensor and an air storage tank are sequentially arranged on the air inlet pipeline; the gas detection pipeline is used for connecting a gas detection port of the quick exhaust valve, a gas detection port pressure sensor and a gas detection electromagnetic valve are sequentially arranged on the gas detection pipeline, and the exhaust pipeline is provided with a gas flowmeter; the PLC is respectively connected with the air inlet electromagnetic valve, the pressure regulating valve, the air inlet pressure sensor, the air detection electromagnetic valve and the flowmeter through circuits. According to the invention, the performance of the quick exhaust valve can be detected without installing the quick exhaust valve to a pantograph, so that multiple test projects can be performed in a centralized manner, the test preparation time of gas circuit connection, air tightness inspection and the like in different test projects is reduced, and the test efficiency of the quick exhaust valve is greatly improved.
Description
Technical Field
The invention relates to the technical field of air bag type pantograph quick exhaust valves, in particular to a test device and a test method of a quick exhaust valve for an air bag type pantograph.
Background
The pantograph is a device for collecting current from a single or a plurality of contact wires, and the air bag type pantograph adopts compressed air to push an air bag to lift the pantograph. The automatic pantograph lowering device is an important protection device of an air bag type pantograph and has the function of ensuring that the pantograph can be quickly separated from a contact net when a pantograph head of the pantograph fails or is damaged, so that pantograph accidents are avoided. The quick exhaust valve is an actuating element of the automatic pantograph lowering device, when a sliding plate and a related gas circuit leak, the pressure difference of an upper cavity and a lower cavity of the quick exhaust valve changes, so that a membrane plate is pushed to be opened, a pantograph air bag and gas circuit gas are rapidly exhausted, a pantograph can be rapidly lowered in time, and the purpose of rapidly separating from a contact net is achieved, and therefore the quick exhaust valve is an important element of the air bag type pantograph.
In view of the important function of the quick exhaust valve, after the quick exhaust valve is produced, a series of tests including an air tightness performance test, a function test and the like are required to be carried out to determine whether the produced quick exhaust valve meets the qualified requirements. However, the existing test needs to be carried out by installing the quick exhaust valve on the pantograph, the test is inconvenient, and when the airtight performance test is carried out, if the test is carried out on the pantograph, the pantograph gas circuit parts are more, the gas circuit connection process is complicated, when leakage occurs, each part of the pantograph needs to be checked one by one to determine the leakage reason, time and labor are wasted, and the test efficiency of the quick exhaust valve is greatly influenced.
Disclosure of Invention
In order to solve the problems, the invention provides the rapid exhaust valve testing device and the testing method for the air bag type pantograph, when the device and the testing method are used for performing the performance test of the rapid exhaust valve, the rapid exhaust valve does not need to be installed on the pantograph, a plurality of testing projects can be performed in a centralized manner, the testing preparation time of air path connection, air tightness inspection and the like in different testing projects is reduced, and the testing efficiency of the rapid exhaust valve is greatly improved.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the utility model provides a gasbag formula quick discharge valve test device for pantograph, includes:
one end of the air inlet pipeline is connected with an air source, the other end of the air inlet pipeline is connected with an air inlet of the quick exhaust valve, and an air inlet electromagnetic valve, an air filter, a pressure regulating valve, an air inlet pressure sensor and an air storage tank are sequentially arranged on the air inlet pipeline along the air flowing direction;
the gas detection pipeline is used for connecting a gas detection port of the quick exhaust valve, and a gas detection port pressure sensor and a gas detection electromagnetic valve are sequentially arranged on the gas detection pipeline along the gas flowing direction;
the exhaust pipeline is used for connecting an exhaust port of the quick exhaust valve, and a gas flowmeter is arranged on the exhaust pipeline;
and the PLC is respectively connected with the air inlet electromagnetic valve, the pressure regulating valve, the air inlet pressure sensor, the air detection electromagnetic valve and the gas flowmeter through circuits and is used for collecting data information of the connected units and controlling the air inlet electromagnetic valve, the pressure regulating valve and the air detection electromagnetic valve.
Further, gasbag formula quick discharge valve test device for pantograph still includes the touch-sensitive screen, the touch-sensitive screen with the controller circuit for provide human-computer interface.
Further, the air inlet electromagnetic valve and the air detection electromagnetic valve are both two-position three-way electromagnetic valves.
A test method of a quick exhaust valve test device for an air bag type pantograph comprises the following steps:
(1) Connecting an air inlet pipeline with an air source, connecting an air detection pipeline with an air detection port of the rapid exhaust valve to be detected, and connecting an exhaust pipeline with an exhaust port of the rapid exhaust valve to be detected;
(2) The air inlet electromagnetic valve is powered on and switched off, the air detection electromagnetic valve is powered off and switched off, compressed air is sent into the air storage tank from an air source through the air filter and the pressure regulating valve, the air inlet electromagnetic valve is powered off and switched off after pressure values detected by the air inlet pressure sensor and the air detection port pressure sensor are stable, a detection value of the air inlet pressure sensor is recorded, namely initial test air pressure, the detection value of the air detection port pressure sensor is recorded after pressure maintaining is carried out for 10min, namely air pressure after the test is finished, and then the air pressure reduction ratio is calculated to finish the air tightness performance test of the quick exhaust valve;
(3) The method comprises the steps of electrifying and conducting an air inlet electromagnetic valve, electrifying and disconnecting an air detection electromagnetic valve, sending compressed air from an air source to an air storage tank through an air filter and a pressure regulating valve, electrifying and conducting the air detection electromagnetic valve after pressure values detected by an air inlet pressure sensor and an air detection port pressure sensor are stable, rapidly reducing the pressure of an upper cavity of a rapid exhaust valve, forming a pressure difference between the upper cavity and the lower cavity, enabling the pressure of a lower cavity to be higher than that of the upper cavity, pushing a diaphragm to open an exhaust port, achieving rapid exhaust, electrifying and disconnecting the air detection electromagnetic valve after the rapid exhaust is completed, enabling the pressure values detected by the air inlet pressure sensor and the air detection port pressure sensor to be stable again, and completing a functional test of the rapid exhaust valve after repeating the steps for multiple times;
(4) The method comprises the steps that an air inlet electromagnetic valve is powered on and switched on, an air detection electromagnetic valve is powered off, compressed air is sent into an air storage tank from an air source through an air filter and a pressure regulating valve, the air detection electromagnetic valve is powered on and switched on after pressure values detected by an air inlet pressure sensor and an air detection port pressure sensor are stable, the pressure of an upper cavity of a quick exhaust valve is rapidly reduced, the pressure difference between the upper cavity and a lower cavity is formed, the pressure of the lower cavity is higher than that of the upper cavity, a diaphragm is pushed to open an exhaust port, quick exhaust is achieved, the difference between the pressure value when the pressure value of the air inlet pressure sensor rapidly reduces and the pressure value of the air detection port pressure sensor rapidly reduces is recorded, and the opening pressure difference test of the quick exhaust valve is completed;
(5) Recording the time difference between the time when the air inlet pressure sensor is rapidly reduced and the time when the air inlet electromagnetic valve is electrically conducted in the step (4), and completing the opening pressure difference test of the rapid exhaust valve;
(6) And (4) recording the exhaust flow of the exhaust port measured by the flowmeter when the pressure value of the air inlet pressure sensor in the step (4) is rapidly reduced, and completing the maximum exhaust flow test of the rapid exhaust valve.
Further, after the PLC in the step (4) collects pressure values detected by the air inlet pressure sensor and the air detecting port pressure sensor, the detected pressure values are drawn into a pressure change curve graph.
The invention has the beneficial effects that:
1. when the air bag type pantograph quick exhaust valve testing device is used for testing, the performance of the quick exhaust valve can be detected without installing the quick exhaust valve to a pantograph, the operation is convenient, and the testing efficiency of the quick exhaust valve is greatly improved.
2. The air bag type pantograph quick exhaust valve test device can realize the automatic test of the quick exhaust valve by utilizing the PLC and the high-precision pressure sensor, and further improves the test efficiency of the quick exhaust valve while providing reliable and accurate test result.
3. When the air bag type pantograph quick exhaust valve test device is used for detecting the performance of the quick exhaust valve, a plurality of test items can be intensively carried out, the test preparation time of air circuit connection, air tightness detection and the like is reduced, the labor intensity of test personnel is reduced, and the test efficiency of the quick exhaust valve is further improved.
Description of the drawings:
FIG. 1 is a schematic view of a quick release valve;
FIG. 2 is a schematic diagram of the present invention.
The labels in the figure are: 1. the gas detection device comprises a gas detection port, 2 parts of an upper chamber, 3 parts of a diaphragm plate, 4 parts of a lower chamber, 5 parts of a gas inlet, 6 parts of a gas outlet, 7 parts of a gas inlet pipeline, 701 parts of a gas source, 8 parts of a gas inlet electromagnetic valve, 9 parts of an air filter, 10 parts of a pressure regulating valve, 11 parts of a gas inlet pressure sensor, 12 parts of a gas storage tank, 13 parts of an exhaust pipeline, 14 parts of a gas detection electromagnetic valve, 15 parts of a gas detection port pressure sensor, 16 parts of a gas flowmeter, 17 parts of the exhaust pipeline, 18 parts of a PLC, 19 parts of a touch screen.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
As shown in the figure, the air bag type quick exhaust valve test device for the pantograph comprises an air inlet pipeline 7, an air detection pipeline 13, an exhaust pipeline 17 and a PLC controller 18, wherein one end of the air inlet pipeline 7 is used for being connected with an air source 701, the air source 701 can be a compressed air tank or an air compressor, the other end of the air inlet pipeline 7 is used for being connected with an air inlet 5 of the quick exhaust valve, an air inlet electromagnetic valve 8, an air filter 9, a pressure regulating valve 10, an air inlet pressure sensor 11 and an air storage tank 12 are sequentially arranged on the air inlet pipeline 7 along the air flowing direction, the air filter 9 is used for removing impurities such as water, oil and particles in the compressed air, the pressure regulating valve 10 is used for accurately regulating the pressure in an air circuit, the air inlet electromagnetic valve 8 is used for controlling the on-off of the compressed air from the air source 701, the air inlet pressure sensor 11 is used for measuring the pressure of the flowing air, and the air storage tank 12 is used for storing the compressed air, so as to simulate the volume of the pantograph airbag and the air circuit.
Examine gas piping 13 and be used for connecting quick exhaust valve examine gas port 1, examine gas piping 13 and go up along gas flow direction and be equipped with in proper order and examine gas port pressure sensor 15 and examine gas solenoid valve 14, examine gas port pressure sensor 15 and be used for surveing quick exhaust valve and examine gas port (1) discharge gas's pressure, examine gas solenoid valve 14 and be used for controlling the break-make of examining gas port 1 discharge gas, when examining 14 circular telegrams of gas solenoid valve and switching on, play the effect of simulation pantograph head slide and relevant gas circuit leakage condition.
The PLC controller 18 is electrically connected to the air inlet solenoid valve 8, the pressure regulating valve 10, the air inlet pressure sensor 11, the gas detection solenoid valve 14, and the gas flow meter 16, and is configured to collect data information of the connection units and control the air inlet solenoid valve 8, the pressure regulating valve 10, and the gas detection solenoid valve 14.
In specific implementation, a touch screen 19 can be arranged on the rapid exhaust valve testing device for the air bag type pantograph, the touch screen 19 and the PLC 18 circuit are used for providing a man-machine interaction interface, a testing worker can set the opening degree of the pressure regulating valve 10 through the touch screen to control the power on or power off of the air inlet electromagnetic valve 8 and the air detection electromagnetic valve 14, and then the on/off of the air inlet electromagnetic valve 8 and the air detection electromagnetic valve 14 is controlled.
A test method of a quick exhaust valve test device for an air bag type pantograph comprises the following steps:
(1) The end of the air inlet pipeline 7 for air inlet is connected with the air source 701, the other end of the air inlet pipeline is connected with the air inlet 5 of the quick exhaust valve, the air detecting pipeline 13 is connected with the air detecting port 1 of the quick exhaust valve to be detected, and the exhaust pipeline 17 is connected with the exhaust port 6 of the quick exhaust valve to be detected.
(2) The air inlet electromagnetic valve 8 is powered on and switched off, the air detection electromagnetic valve 14 is powered off and switched off, compressed air is sent into the air storage tank 12 from the air source 701 through the air filter 9 and the pressure regulating valve 10, after pressure values detected by the air inlet pressure sensor 11 and the air detection port pressure sensor 15 are stable, the air inlet electromagnetic valve 8 is powered off and switched off, a detection value of the air inlet pressure sensor 11 is recorded, namely, test starting air pressure, after pressure maintaining is carried out for 10min, a detection value of the air detection port pressure sensor 15 is recorded, namely, test ending air pressure, then, an air pressure reduction ratio is calculated to complete an air tightness test of the quick exhaust valve, the air pressure reduction ratio is calculated according to 'air pressure reduction ratio = (test starting air pressure-test ending air pressure)/test starting air pressure', and when the air pressure reduction ratio is not more than 5%, the quick air tightness test is judged to be qualified.
(3) The method comprises the steps of electrifying and conducting an air inlet electromagnetic valve 8, deenergizing and disconnecting an air detection electromagnetic valve 14, sending compressed air from an air source 701 to an air storage tank 12 through an air filter 9 and a pressure regulating valve 10, electrifying and conducting the air detection electromagnetic valve 14 after pressure values detected by an air inlet pressure sensor 11 and an air detection port pressure sensor 15 are stable, rapidly reducing the pressure of an upper cavity 2 of the rapid exhaust valve, forming a pressure difference between the upper cavity and a lower cavity, enabling the pressure of a lower cavity 4 to be higher than that of the upper cavity, pushing a diaphragm plate 3 to open an exhaust port 6, achieving rapid exhaust, deenergizing and disconnecting the air detection electromagnetic valve 14 after the rapid exhaust is completed, enabling the pressure values detected by the air inlet pressure sensor 11 and the air detection port pressure sensor 15 to be stable again, repeating the steps for multiple times, completing a functional test of the rapid exhaust valve, checking whether the rapid exhaust valve is abnormally damaged, and judging that the functional test of the rapid exhaust valve is qualified;
(4) The air inlet electromagnetic valve 8 is powered on and switched on, the air detection electromagnetic valve 14 is powered off, compressed air is sent into the air storage tank 12 from the air source 701 through the air filter 9 and the pressure regulating valve 10, after pressure values detected by the air inlet pressure sensor 11 and the air detection port pressure sensor 15 are stable, the air detection electromagnetic valve 14 is powered on and switched on, the pressure of the upper cavity 2 of the quick exhaust valve is rapidly reduced, the pressure difference between the upper cavity and the lower cavity is formed, the pressure of the lower cavity 4 is higher than that of the upper cavity, the diaphragm plate 3 is pushed to open the exhaust port 6, quick exhaust is achieved, the difference between the pressure value when the pressure value of the air inlet pressure sensor 11 is rapidly reduced and the pressure value of the air detection port pressure sensor 15 when the pressure value of the air inlet pressure sensor 11 is rapidly reduced is recorded, and the opening pressure difference test of the quick exhaust valve is completed;
(5) Recording the time difference between the time when the air inlet electromagnetic valve 14 is electrified and conducted and the time when the pressure value of the air inlet pressure sensor 11 rapidly drops in the step (4), and completing the opening pressure difference test of the rapid exhaust valve;
(6) And (4) recording the exhaust flow of the exhaust port 6 measured by the gas flowmeter 16 when the pressure value of the air inlet pressure sensor 11 in the step (4) is rapidly reduced, and finishing the maximum exhaust flow test of the rapid exhaust valve.
When the method for detecting the performance of the quick exhaust valve is specifically implemented, pressure values detected by the air inlet pressure sensor 11 and the air detection port pressure sensor 15 collected by the PLC controller 18 in (4) can be plotted into a pressure change curve, and then the curve is obtained through the touch screen 19.
When the air bag type pantograph quick exhaust valve test device is used for detecting the performance of a quick exhaust valve, the performance of the quick exhaust valve can be detected without installing the quick exhaust valve to a pantograph, the test connection is convenient, the test flow can be automatically completed, a plurality of test items are intensively carried out, the test preparation time of air circuit connection, air tightness detection and the like is reduced, the labor intensity of test personnel is reduced, the test efficiency of the quick exhaust valve is greatly improved, the test data of the quick exhaust valve can be more conveniently and accurately obtained, data support is provided for quick response of the quick exhaust valve in the high-speed operation process of the air bag type pantograph of an electric locomotive, unqualified quick exhaust valves are prevented from entering a use link, and the occurrence frequency of pantograph accidents is reduced.
It should be noted that the above embodiments are only for illustrating the present invention, but the present invention is not limited to the above embodiments, and any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention fall within the protection scope of the present invention.
Claims (4)
1. The utility model provides a gasbag formula quick exhaust valve's for pantograph test method which characterized in that adopts gasbag formula quick exhaust valve test device for the pantograph to go on, and gasbag formula quick exhaust valve test device for the pantograph includes:
the air inlet pipeline (7) is connected with an air source (701) at one end and connected with an air inlet (5) of the quick exhaust valve at the other end, and an air inlet electromagnetic valve (8), an air filter (9), a pressure regulating valve (10), an air inlet pressure sensor (11) and an air storage tank (12) are sequentially arranged on the air inlet pipeline (7) along the air flowing direction;
the gas detection pipeline (13) is used for connecting a gas detection port (1) of the quick exhaust valve, and a gas detection port pressure sensor (15) and a gas detection electromagnetic valve (14) are sequentially arranged on the gas detection pipeline (13) along the gas flowing direction;
the exhaust pipeline (17) is used for connecting an exhaust port (6) of the quick exhaust valve, and a gas flowmeter (16) is arranged on the exhaust pipeline (17);
the PLC (18) is respectively in circuit connection with the air inlet electromagnetic valve (8), the pressure regulating valve (10), the air inlet pressure sensor (11), the air detection electromagnetic valve (14) and the gas flowmeter (16) and is used for collecting data information of the connected units and controlling the air inlet electromagnetic valve (8), the pressure regulating valve (10) and the air detection electromagnetic valve (14);
the test method comprises the following steps:
s1, connecting one end, used for air inlet, of an air inlet pipeline (7) with an air source (701), connecting the other end of the air inlet pipeline with an air inlet (5) of a quick exhaust valve, connecting an air detection pipeline (13) with an air detection port (1) of the quick exhaust valve to be detected, and connecting an exhaust pipeline (17) with an exhaust port (6) of the quick exhaust valve to be detected;
s2, the air inlet electromagnetic valve (8) is powered on and switched on, the air detection electromagnetic valve (14) is powered off and switched off, compressed air is sent into an air storage tank (12) from an air source (701) through an air filter (9) and a pressure regulating valve (10), the air inlet electromagnetic valve (8) is powered off and switched off after pressure values detected by an air inlet pressure sensor (11) and an air detection port pressure sensor (15) are stable, a detection value of the air inlet pressure sensor (11) is recorded, namely test starting air pressure, after pressure maintaining is carried out for 10min, a detection value of the air detection port pressure sensor (15) is recorded, namely test ending air pressure, and then the air pressure reduction ratio is calculated to complete the air tightness performance test of the quick exhaust valve;
s3, the air inlet electromagnetic valve (8) is powered on and switched on, the air detection electromagnetic valve (14) is powered off and switched off, compressed air is sent into an air storage tank (12) from an air source (701) through an air filter (9) and a pressure regulating valve (10), the air detection electromagnetic valve (14) is powered on and switched on after pressure values detected by an air inlet pressure sensor (11) and an air detection port pressure sensor (15) are stable, the pressure of an upper cavity (2) of the quick exhaust valve is rapidly reduced, a pressure difference between the upper cavity and a lower cavity is formed, the pressure of a lower cavity (4) is higher than that of the upper cavity, the diaphragm plate (3) is pushed to open the exhaust port (6), quick exhaust is realized, the air detection electromagnetic valve (14) is powered off after the quick exhaust is finished, the pressure values detected by the air inlet pressure sensor (11) and the air detection port pressure sensor (15) are stabilized again, and the functional test of the quick exhaust valve is finished after the steps in the S3 are repeated for multiple times;
s4, the air inlet electromagnetic valve (8) is powered on and conducted, the air detection electromagnetic valve (14) is powered off, compressed air is sent into the air storage tank (12) from the air source (701) through the air filter (9) and the pressure regulating valve (10), after pressure values detected by the air inlet pressure sensor (11) and the air detection port pressure sensor (15) are stable, the air detection electromagnetic valve (14) is powered on and conducted, the pressure of the upper cavity (2) of the quick exhaust valve rapidly drops, pressure difference between the upper cavity and the lower cavity is formed, the pressure of the lower cavity (4) is higher than that of the upper cavity, the diaphragm (3) is pushed to open the exhaust port (6), quick exhaust is achieved, the difference between the pressure value when the pressure of the air inlet pressure sensor (11) rapidly drops and the pressure value of the air detection port pressure sensor (15) when the pressure of the air inlet pressure sensor (11) rapidly drops is recorded, and the opening pressure difference test of the quick exhaust valve is completed;
s5, recording the time difference between the time when the air inlet electromagnetic valve (14) is electrified and conducted and the time when the pressure value of the air inlet pressure sensor (11) rapidly drops in S4, and completing the opening pressure difference test of the rapid exhaust valve;
and S6, recording the exhaust flow of the exhaust port (6) measured by the gas flowmeter (16) when the pressure value of the air inlet pressure sensor (11) in the S4 is rapidly reduced, and completing the maximum exhaust flow test of the rapid exhaust valve.
2. The method for testing the quick exhaust valve for the air bag type pantograph according to claim 1, wherein in S4, after the PLC controller (18) collects the pressure values detected by the intake pressure sensor (11) and the gas inlet pressure sensor (15), the detected pressure values are plotted into a pressure change curve.
3. The method for testing the rapid exhaust valve for the air bag type pantograph according to claim 1, wherein the device for testing the rapid exhaust valve for the air bag type pantograph further comprises a touch screen (19), and the touch screen (19) is in circuit connection with the PLC (18) and used for providing a human-computer interaction interface.
4. The test method of the rapid exhaust valve for the air bag type pantograph according to claim 1, wherein the air inlet solenoid valve (8) and the air detection solenoid valve (14) are both two-position three-way solenoid valves.
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| CN102346089A (en) * | 2010-08-05 | 2012-02-08 | 新疆华油油气工程有限公司 | Threaded connection high-pressure gas seal detection tool |
| CN203203770U (en) * | 2013-04-01 | 2013-09-18 | 广州市上腾电子科技有限公司 | Valve body leakage test system |
| CN104590032A (en) * | 2014-11-28 | 2015-05-06 | 南车株洲电力机车有限公司 | Electric locomotive and controlling device and method for pantograph type current collector |
| CN105716952A (en) * | 2014-12-03 | 2016-06-29 | 中国飞机强度研究所 | Test method for skin test part |
| CN206132329U (en) * | 2016-08-26 | 2017-04-26 | 北京公共交通控股（集团）有限公司 | Gasbag solenoid valve detection device |
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