Publish Time: 2023-11-02 Origin: Site
We all know that public transportation is essential to modern life, especially today when public transportation is becoming more and more intelligent, the public transportation wiring harnesses is the key to the electrical system of the whole vehicle. It is because of the linkage of the public transportation wiring harnesses that the various electronic instruments in the car can operate normally and realize various intelligent functions. However, the public transportation wiring harnesses are a multi-part product, and its inspection components include wire inspection, sheath inspection, terminal inspection, fastening tape inspection, heat shrink tube inspection, subminiature tape inspection, copper braid inspection, seal inspection, and so on. The materials involved also include rubber materials, plastic materials, metal materials, and many other fields. This poses a challenge to the public transportation harness inspection work. Then I will introduce how the public transportation wiring harnesses are tested!
Here is the content list:
Public transportation harness testing project
Public transportation wiring harness testing equipment and experiments
Recommended public transportation wiring harness testing indicators
The public transportation wiring harnesses testing project includes the appearance of the test, electrical harness line size measurement, terminal, and the wire connection, contact detection, rubber parts waterproof performance, electrical performance, temperature resistance, humidity resistance, vibration resistance, salt spray resistance, chemical resistance and so on. Of course, these testing projects will be subdivided into many specific projects. Take the terminal and wire connection test as an example, first, we have to test the terminal and wire crimp connection, conductor connection, insulation layer connection, insulation crimp with sealing plugs, even tendons, connection strength, voltage drop, brazing connection, and other items. Among them, insulation layer connection, we can test by bending test, and connection strength, it can be measured by the minimum tension value to respond.
Public transportation wiring harnesses size measurement, the instruments to be used are steel tape measure, professional checker, protractor. The tests involved are terminal and wire connection test, insulation layer crimping bending test, conductor crimping area cross-section test, connection strength test, voltage drop test, joint test, wet zone joint immersion test, joint tearing force test, rubber parts waterproof performance test, electrical performance testing test, and related weather resistance test (chemical resistance, low-temperature resistance, high-temperature resistance, resistance to temperature changes, resistance to temperature and humidity changes). The test of vibration resistance, etc.
Public transportation wiring harnesses testing items are electrical performance: rated voltage, rated current, temperature rise, contact resistance, insulation resistance, electrical strength, current cycle resistance, and other indicators. Mechanical performance: insertion force, extraction force, terminal retention force, hook-up strength, unlocking force, mechanical shock resistance, and other indicators. Environmental performance: air tightness, water resistance, salt spray resistance, heat aging resistance, oil and liquid resistance, etc.
No matter what, public transportation wiring harnesses testing should still be based on the needs of customers. Some manufacturers will test the harness subcomponents for resistance to rapid current, bending resistance, cold resistance, acid resistance, and ozone resistance. This is also based on the consideration of the working environment of their product applications. There are also cost considerations to remove some unnecessary testing items. This all requires us to carry out a scientific and reasonable development of testing programs.
So through my little introduction, do you understand how the public transportation wiring harnesses are tested? I hope my introduction will be helpful to you!