How to detect whether the connector is good or bad?

The connector is one of the electronic devices that everyone is very familiar with. There are many types of connectors on the market, with various specifications and styles, as well as many excellent connection technologies. In order to improve everyone's understanding of connectors, we mainly introduce the connection methods, classification and detection methods of connectors.

  1. Connector connection method

  1. Threaded connection method

   has larger size contacts and can work in strong vibration environment A form of connection often used by a connector. This type of connection can be equipped with a fuse to prevent loosening after the connection is completed. This connection form is reliable to use, but the unloading speed is slow.

  2, bayonet connection method

   is a reliable and rapid connection and separation form. Most connectors in the card 121 connection style have a visual indication of proper connection and locking, which can be viewed from the small hole on the side of the connector nut.

  3. Plug-in connection method

   is a multi-purpose connection form. When the plug and socket of the connector are connected and separated, the moving direction is usually a reciprocating linear motion, which does not need to be twisted and rotated, and only needs a small working space to complete the continuous unloading. Common plug connections have two structures of balls or pins. Because there is no mechanical labor-saving mechanism in this connection form, once it is inserted by mistake, the mechanical resistance will increase significantly, and it can be found in time.

  4. Cabinet connection method

   is a connector for some equipment that needs to be blindly connected near the frame, which can make the electrical equipment lighter, smaller and easier maintenance and more reliable. This form of connection makes it impossible for the operator to feel the connection, and a precise positioning device must be designed to avoid forcibly connecting the wrongly inserted connectors together, making the wrongly inserted impossible. Cabinet type circular push-pull self-locking connectors usually adopt floating or elastic contact design structure to ensure their correct connection.

   Second, the classification of connectors

  1/ According to the shape: circular electrical connector, rectangular electrical connector. Circular electrical connectors are used the most in military equipment (aviation, aerospace). Rectangular electrical connectors are mostly used on printed circuit boards for electronic equipment.

  2/ According to the structure:

   According to the connection method: threaded connection, bayonet (quick) connection, latch connection, push-pull connection, in-line connection, etc.;

  According to the contact body termination form: crimping, welding, wrapping; screw (cap) fixing; Connectors

  3/ According to the purpose: sealed electrical connectors, high temperature electrical connectors, separated electrical connectors, filter electrical connectors, power electrical connectors and printed circuit board electrical connectors, etc. .

  Third, the quality of the connector inspection

  1. The manufacturer inspects the connector

  First of all, we understand the following basic connector appearance standards, The connector is composed of terminal shell and needle seat. We divide it into pre-assembly and post-assembly inspection:

  Pre-assembly inspection: lack of material, burrs, shrinkage, deformation, color difference, dirt, blockage Holes, indentations, unevenness/deformation of the barrier plate, upturning of the stuck point, sag/deviation or fracture, wrong PIN identification/no PIN identification

   Inspection after assembly: copper shell/iron shell and Whether there is a gap in the plastic shell, deformation of the iron shell/copper shell, the buckle is not pressed in place/biased, the plastic shell is crushed, the left and right hooks are not installed in place (the exposed size of the two ends of the hooks is inconsistent), and the hooks are pressed several times by hand. , Confirm whether the left and right hooks are normal and whether there is elasticity. These are the detection steps in the manufacturer's quality inspection.

   2. Personal detection connector

   There are some that seem to be fine on the surface, but the inside is broken. Experienced people can directly tell whether the connector is good or bad by touching, smelling and seeing.

  1/ Touch, feel the production of the connector is meticulous, if the surface has obvious roughness, the life is not baozheng, there is a huge difference between itself and good products in terms of anquanity.

  2/ Smell, some manufacturers will add fragrance to cover up the taste of inferior materials, so if you encounter fragranced products, you need to scrutinize them more carefully.

  3/ Look, if you see that the connector and socket are heavily oxidized on the metal surface, basically a gray color close to the degree, these are quality problems and will affect the quality of the soldering. Generally, unused connectors will not be oxidized or damaged in appearance.

  Connector is an indispensable part of electronic equipment. Looking along the path of current flow, you will always find one or more connectors. The form and structure of connectors are ever-changing, and there are various forms of connectors with different application objects, frequencies, power, and application environments. It plays an important role in the construction of electronic engineering, making the circuit smooth, so it has been widely used.

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