Talking about the assembly process of terminal blocks

During the entire assembly process, the terminal must withstand the high temperature in the preheating zone and the temperature conducted to the terminal body through wave soldering. The flux must not affect the terminal, must be easy to remove, and there must be no residue. The entire assembly process must be washable with water The preheating temperature often reaches 100 degree or higher, and it is not uncommon for the peak temperature to reach 280 degree . The perforated solder pins must be accurately positioned, properly sized, balanced, and have good solderability, which is conducive to insertion and soldering.

During the entire assembly process, it must withstand the high temperature impact of heat treatment. In welding, infrared preheating and convection preheating are mainly used to conduct heat to the solder pin and tin plate interface to melt the solder paste. The contact has poor resistance to fusion welding, When the motor is started or the circuit is short-circuited, the large current causes a contact. The head is welded firmly and cannot be released, and the pure silver contact is easier to weld. The main contacts of the AC contactor should be made of silver-based alloys with strong resistance to welding, such as silver iron and silver nickel.

In the optical fiber communication (transmission) link, in order to realize the needs of flexible connection between different modules, equipment and systems, there must be a device that can be detachably connected between the optical fiber and the optical fiber, so that the optical path can be According to the required channel for transmission, in order to achieve and complete the predetermined or expected purpose and requirements, the device that can achieve this function is called a connector.

The terminal block precisely connects the two end faces of the optical fiber so that the light energy output by the transmitting optical fiber can be coupled to the receiving optical fiber to the maximum extent, and the impact on the system due to its intervention in the optical link is minimized. This is the basic requirement of fiber optic connectors.

The terminal has good connection characteristics even when the temperature fluctuates greatly. Because this can avoid different degrees of thermal expansion due to the difference in the thermal expansion coefficient of the material, it can also avoid the generation of mechanical stress in the terminal and avoid the loosening of the connection. Use "Reakdyn principle" to prevent terminal screws from loosening. In the preferred terminal series with a rated cross-section up to 10mm2, the crimping frame adopts a lifting barrel structure. Their principle of action is based on the so-called "lifting cylinder principle". Continuous improvement of circuit board technology has greatly increased the current that can be carried by the terminal blocks installed on the panel.