CN201060087Y - Self-checking device for leak testing machine - Google Patents

Abstract

The utility model relates to a self-checking device of a leakage measuring machine, which belongs to the technical field of the detection of the industrial parts leakage. The utility model is characterized in that the self-checking device is composed of three two-position three-port electromagnetic valves, a pressure sensor and a standard leak, and the utility model is formed by connection modes as follows: an air power is connected with a P end which controls an inlet electromagnetic valve and an exhaust electromagnetic valve, and the A end is connected with an A end of an isolated electromagnetic valve; a R end of the isolated electromagnetic valve is connected with an air inlet end of a tested work piece and a P end which controls a leak electromagnetic valve, and the R end of the isolated electromagnetic valve is connected with the pressure sensor 4; the A end which controls the leak electromagnetic valve is connected with a standard leak piece. The positives effects after the utility model is implemented is that a property measuring machine possesses the function of self-examination, reflects whether a system is in a normal state immediately after operation and resists risk. The self-examination function has the advantages of very concision, easy operation, low cost and flexible use, which is a good helper on an industrial production line.

Description

Self-checking device for leak testing machine

technical field

The invention belongs to the technical field of detection of industrial parts, specifically a detection technology related to leakage of industrial parts.

Background technique

Existing leak testing equipment often does not have the function of self-checking. If the equipment is running in a fault state and cannot be found in time, it will cause wrong test results and serious consequences: the tested parts with problems will be treated as Use as qualified parts, or treat qualified parts as waste products; some testing machines use special workpieces or measuring tools to test the system, but such workpieces are expensive to manufacture and can only be used for specific fixtures, which are not universal. And it needs to be sent for inspection regularly, which is troublesome and time-consuming to operate.

Contents of the invention

The utility model provides a self-inspection device of a leakage testing machine which is simple in operation, low in production cost, time-consuming and reliable in detecting the state of a testing system.

The technical scheme that the present invention takes:

The self-inspection device of the leak tester includes a leak tester, a 2-position 3-way solenoid valve, a pressure sensor, a vent pipe for connection and a PLC controller for controlling the solenoid valve. The solution is: there is also a self-test for leakage conditions Device, this self-test device is composed of three 2-position 3-way solenoid valves, a pressure sensor and a standard leak hole, and is composed of the following connection methods: the air source is connected to the P terminal that controls the intake and exhaust solenoid valves, and its Terminal A is connected to terminal A of the isolation solenoid valve, and terminal R of the isolation solenoid valve is connected to the inlet terminal of the workpiece to be tested and the P terminal of the control leak solenoid valve, and is connected to the pressure sensor 4, which controls the leak solenoid valve. End A of the valve connects to a standard orifice.

The positive effect after implementing the utility model is:

The performance testing machine has a self-check function, which can immediately reflect whether the system is in a normal state after running, and resist risks. And this self-checking function is very simple, easy to operate, low in cost, flexible in use, and is a good helper in industrial production lines.

Description of drawings

Fig. 1 is a schematic diagram of the structure principle of the utility model

Detailed ways

The present invention will be further described now in conjunction with accompanying drawing

The self-inspection device of the leak tester includes a leak tester, a 2-position 3-way solenoid valve, a pressure sensor, a vent pipe for connection and a PLC controller for controlling the solenoid valve. Its structure is: there is also a self-test for leakage conditions Device, this self-test device is composed of three 2-position 3-way solenoid valves, a pressure sensor and a standard leak hole, and is composed of the following connection methods: the air source 1 is connected to the P terminal that controls the intake and exhaust solenoid valve 2 , its A end is connected to the A end of the isolation solenoid valve 3, the R end of the isolation solenoid valve is connected to the air inlet end of the tested workpiece 7 and the P end of the control leak solenoid valve 6, and connected to the pressure sensor 4, The end A of the solenoid valve 6 for controlling the leakage hole is connected with the standard leakage hole piece 5 . The 2-position 3-way solenoid valve is that the solenoid valve is P in the energized state, and both ends of A are connected.

Embodiment one:

When the test part is under 550kPa, if the leakage rate exceeds 5ccm per minute, it is a substandard product.

The normal test process is as follows:

1. The PLC control signal energizes the solenoid valve 2, so that the P and A terminals are connected, and the compressed air of 550kPa enters from the air source, and the pressure of the entire system pipeline and the interior of the workpiece is 550kPa;

2. The PLC control signal energizes the solenoid valve 3, connects the P and A terminals, and isolates the workpiece and the test pipeline from the outside world;

3. After a period of stabilization, if the reading of the pressure sensor is lower than 500kPa (the leakage flow rate of 5ccm will cause the air pressure in the test pipeline to drop by about 50kPa after this stabilization time), the workpiece is considered to be unqualified.

Embodiment two:

The self-test test process is as follows:

1. The operator first puts in a "qualified workpiece" dedicated for self-inspection, which is a workpiece with very small leakage obtained in daily production;

2. Then the system automatically performs a normal leak test. If the result of the leak test is qualified (greater than 500kPa), it can be considered that the relevant inflation solenoid valve 2 and isolation solenoid valve 3 are working normally.

3. Then the PLC control signal energizes the solenoid valve 6, connects the P to the A terminal, connects the 6ccm@550kPa leak hole to the test pipeline, and conducts the leak test again. If the result reading of the leak test is lower than 500kPa, but higher than 450kPa (the leak flow rate of 6ccm will cause the air pressure in the test pipeline to drop by about 60kPa after this period of stabilization time, plus the leakage of the workpiece itself, so it is 450~ 500kPa target interval), it can be considered that the relevant sensors and leak control valves are working normally.

4. When these two self-inspection tests are passed, it can be considered that all components of the system are working normally.

Claims (2)

1. the self-checking unit of leak-testing machine, comprise the leak-testing machine, 23 three-way electromagnetic valves, pressure transducer, the PLC controller of snorkel for connection and control electromagnetic valve, it is characterized in that: also have a self-checking unit that leaks situation, this self-checking unit is by three 23 three-way electromagnetic valves, pressure transducer and referance leak are formed, and be made of following connected mode: source of the gas (1) advances with control, the P end of exhaust solenoid valve (2) connects, its A end is connected with the A end of isolation solenoid valve (3), the R end of isolation solenoid valve is connected with the P end of tested workpiece (7) inlet end and control small opening solenoid valve (6), the R end of its isolation solenoid valve (3) also joins with pressure transducer (4), and the A end of control small opening solenoid valve (6) joins with referance leak spare (5).

2. the self-checking unit of leak-testing machine according to claim 1 is characterized in that: described 23 three-way electromagnetic valves are that solenoid valve is P getting under the electricity condition, and the A two ends communicate.

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