Using skill of push pull connector
Categories: Industry news
Time of issue:2021-09-15
There are many factors to be considered when selecting push-pull self-locking connector, among which environmental parameters are one of the most important factors, including temperature, humidity, air pressure, etc. In different environmental conditions, the use of push-pull self-locking connector is also different, the following to introduce some extreme environment use skills.
1. High temperature
The metal and insulating materials of push-pull self-locking connector determine the working environment temperature of the connector. High temperature will destroy the edge material, resulting in the reduction of insulation resistance and withstand voltage performance; for metals, high temperature can make contact pairs lose elasticity, accelerate oxidation and cause coating deterioration. The normal ambient temperature is - 55 ~ 100 ℃, and higher requirements may be required in special occasions.
The relative humidity is more than 80%. Moisture environment causes the absorption and diffusion of water vapor on the surface of insulator, which easily reduces the insulation resistance below m Ω level. Long term exposure to high humidity environment will cause physical deformation, decomposition and escape of products, resulting in respiratory effect, electrolysis, corrosion and cracks. Especially for the push-pull self-locking connector outside the equipment, it is often necessary to consider the environmental conditions of humidity, water penetration and pollution, in this case, the sealed connector should be selected.
3. A sudden change in temperature
Humidity burst test is to simulate the actual use of push-pull self-locking connector in cold environment to warm environment, or simulate the rapid change of environmental temperature of spacecraft and detector. Rapid temperature changes may cause cracks or delamination of insulating materials.
4. The air is thin
In the high altitude with thin air, the plastic emits gas to pollute the contact pairs, which makes the corona generation trend increase and the withstand voltage performance decrease, resulting in the short circuit fault of the circuit. When it reaches a certain value at high altitude, the properties of plastics become worse. Therefore, the unsealed connector must be derated when it is used at high altitude.
5. Corrosive environment
According to the different corrosion environment of push-pull self-locking connector, select the corresponding metal, plastic, coating structure connector, such as the connector used in salt spray environment, if there is no anti-corrosion metal surface, the performance will rapidly deteriorate. In the environment containing considerable concentration of SO2, it is not suitable to use the connector with silver plated contact pair. Mold is also an important problem in hot and humid areas.
When inserting the connector, the pin must use a certain amount of force to open, and it is easier to pull it out. It can be seen that the insertion force of the connector is greater than the pulling force. Therefore, the interaction between the insertion and pull-out forces can easily cause connector wear. If you want to reduce wear, try the following methods:
1. It can improve the hardness of the gold plating layer on the contact surface, which can effectively reduce friction.
2. The contact surface can be nickel plated and then gold plated, which will produce less friction than direct gold plating on copper. The thicker the nickel layer, the stronger the wear resistance of the gold coating.
3. The smoother the surface, the lower the roughness, the less friction.
4. In the process of using the connector at ordinary times, attention should be paid to the maintenance of the connector to avoid artificial damage to the connector.
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