Connector selection method and the problem of terminal withdrawal

Talking about the selection method of the connector and the problem of terminal withdrawal

Connector selection method

The shape of the connector is ever-changing, and the user mainly chooses from the linear, curved, outer diameter of the wire or cable, the fixing requirements with the shell, volume, weight, whether to connect the metal hose, etc. For connectors used on panels, you can also choose from aesthetics, shapes, colors, and more.

Humidity change testing is to simulate the actual use of equipment with high current connectors in cold to warm environments, or to simulate sudden changes in the ambient temperature of spacecraft and probes that may cause fission or delamination of insulating materials.

When the atmosphere is at high altitudes where the air is thin, the plastic releases gas to contaminate the contacts, increase the tendency of corona generation, reduce the withstand voltage, and cause the circuit to fail. At a certain value of the high-altitude road surface, the plastic performance deteriorates. Unsealed connectors must be degraded when used at high altitudes.

Corrosive Environments Depending on the corrosive environment of high-current connectors, connectors with corresponding metal, plastic, and plated constructions, such as those used in salt spray environments, will deteriorate rapidly without a corrosion-resistant metal surface. Silver plated contact pair connectors are not recommended for use in unsuitable environments. Mold is also a significant problem during hot flashes. Termination method refers to the connection method between the contacts of the high current connector and the wire or cable. The choice of termination method and the proper use of shorting techniques are also an important aspect of the use and selection of connectors.

Three factors of connector terminal pin pull problem

1. Unqualified factors for the terminal retention force of the wire harness connector:

Generally speaking, the unqualified retention force of the terminal in the sheath is caused by the design problem of the wire harness connector, the manufacturing problem and the material used, the insertion clamping force of the standard wire harness connector (the spacing is less than 2.8) is greater than 40N, and the spacing is greater than 40N. The clamping force of the 2.8 connector is greater than 60N.

2. Interpolation interference factors of wire harness connector terminals:

During the insertion process of the male and female terminals of the wire harness connector, the male terminals are automatically inserted into the invalid area of the female terminals, resulting in the withdrawal of the terminal pins and the loss of the function of the connector. This situation is usually caused by problems in the design and manufacturing process. One is structural design. , and the second is the plugging and unplugging of the terminals.

3. Factors in the production process of wire harness connectors:

Factors in the connector production process include terminal crimping and terminal assembly. If the terminal is not crimped properly, excessive bending will cause the center line of the terminal welding area to be non-parallel to the crimping area. Excessive bending of the terminal will easily increase the insertion force and affect the assembly performance. , in severe cases, there will be a problem that the male terminal cannot be inserted into the effective area of the female terminal.