The clamping mechanism of the terminal block is a mechanism that generates pressure between the wire and the conductive strip. Only by generating sufficient pressure can low contact resistance be ensured and a good connection be formed. Therefore, the reliability of the clamping mechanism directly affects the quality of the wire connection. For threaded terminals, screws, copper posts, and pressure plates are important components of the clamping mechanism. For non threaded terminals, springs or spring cards are important components of the clamping mechanism. Non threaded terminals, the clamping mechanism is mainly spring, so the selection of spring material is crucial. It is necessary to ensure sufficient contact pressure and not excessively damage the wire. Spring terminals are currently the most reliable non threaded terminals. When entering the wire, you can press the spring with a push block or screwdriver. After entering the wire, release the spring and use its rebound force to tightly press the wire, generating sufficient contact pressure. Then, use the blade of the spring to pinch the wire to prevent it from loosening or being pulled out artificially
During the use of terminal blocks, a large torque is generally generated to ensure sufficient contact pressure of the wires. Standards GB2099 and GB16915 clearly stipulate that tightening or loosening clamping screws will not cause the terminal itself to loosen. The self-locking ability of screws plays a decisive role in threaded terminals, and the general self-locking principle of terminal screws is based on the "lifting cylinder principle". When tightening the screw, the tightening force of the screw does not directly act on the wire, but on the clamping piece. The automatic step self-locking generated by this gradually increases the thread friction force, achieving screw self-locking and ultimately clamping the wire onto the conductive strip. There are different torque requirements for different thread diameters, such as the M3 crimping screw, which requires a torque of 80N without damaging the terminal
The magnetic system of the wiring terminal has no air gap in the column and excessive residual magnetism. File off a portion of the pole surface at the residual magnetic gap to make the gap 0.1~0.3mm, or connect a 0.1uF capacitor in parallel at both ends of the coil. The surface of the activated contactor iron core may have oil or become greasy after a period of use. Clean the rust proof grease on the surface of the iron core. The surface of the iron core should be smooth, but not too shiny, otherwise it may cause delayed release. During the entire assembly process, it is necessary to withstand the high temperature in the preheating zone and the temperature transmitted to the terminal body through wave soldering. The solder flux must not affect the terminals, must be easy to remove, and must not have any residue. The entire assembly process must be washable with water