The air tightness test bench for auto parts is used to detect whether there is gas leakage in auto parts (such as fuel tank, radiator, airbag, pipe, seal, etc.). Its main function is to detect whether the parts can maintain air tightness under the specified pressure by simulating the working environment and applying certain pressure.
The gas drive air tightness test bench (also known as the pneumatic air tightness test bench) is specially used to detect whether the sealing performance of parts or components under the action of gas pressure is qualified. The structure of gas drive airtight test bench usually includes the following key components:
Air source system: provide stable compressed gas, usually air, nitrogen or other gases. The air supply pressure is usually between 0.1-1.0 MPa.
Pneumatic control valve: it controls gas flow and pressure, usually using proportional valve, regulating valve, etc.
Test fixture: used to fix the parts to be tested and ensure the sealing of the air tightness test area during the test.
Pressure sensor: accurately measure the internal and external pressure of the parts to be tested, monitor the pressure change, and judge the leakage.
Flowmeter: detect the flow of gas to further confirm the size of leakage.
Leakage detection system: acoustic sensor, gas detector (such as helium leak detector) and other equipment are used to accurately detect tiny leakage points.
Control system: used for real-time monitoring of the entire test process, including pressure, temperature, gas flow and other parameters, data acquisition and automatic processing.
Display and alarm system: display the test results and give an alarm when the leakage exceeds the standard.
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The typical operation process of gas drive airtight test bench is as follows:
Preparation: install the parts to be tested to ensure that the test fixture fits closely and that the parts are free from any significant physical damage.
Set parameters: set the pressure, pressurization time, leakage detection standard and other parameters required for the test on the control system.
Pressurization test: start the air source and pressurize the parts to be tested through the pneumatic control system.
Detection process: monitor the pressure change or air flow change through the pressure sensor and flowmeter to confirm whether there is leakage.
Result judgment: judge whether the parts meet the air tightness requirements according to the set standards. If the leakage rate exceeds the standard, it will be judged as unqualified.
Record and report: automatically generate test data report, record test results and possible leakage points.
When using the gas drive air tightness test bench for air tightness test, the following aspects should be paid attention to:
1. equipment calibration: calibrate the pneumatic system, pressure sensor, flowmeter, etc. regularly to ensure the test accuracy.
2. ambient temperature and humidity: temperature and humidity may affect the expansion of gas and the sealing of parts and components, and should be controlled within an appropriate range.
3. test pressure and gas selection: set the appropriate test pressure according to the actual working conditions of the parts to avoid too high or too low test pressure affecting the results.
4. safe operation: operators should wear safety protection equipment to ensure that the equipment is in a safe state and avoid leakage or equipment damage due to improper operation.
5. inspection of seals: ensure that the seals of the parts to be tested are in good condition to avoid affecting the test results due to aging or damage of the seals.
The gas drive airtight test bench adopts high-precision sensors and detection system, which can accurately detect small gas leakage. The test process is highly automated, reducing manual intervention and improving test efficiency. The test scheme can be customized according to the air tightness requirements of different parts to meet different testing requirements. In addition to air tightness detection, it can also be integrated with various functions such as leakage rate measurement and flow test. Air tight test bench is an important equipment to ensure the quality of parts in automobile and other industries, which is of great significance to improve the reliability and safety of products