Since the day of the invention of the radio, electronic assembly technology has been born. With the birth of transistors in the 1940s and the successful development of Printed Circuit Board (PCB), people began to try to solder through-hole components such as transistors directly onto the printed circuit board, making the electronic product structure compact. The volume is greatly reduced. In the 1950s, the British first developed the world's first wave soldering machine, so people inserted the through-hole components such as transistors on the printed circuit board, and then through the wave soldering technology to achieve the assembly of the through-hole components.
This is commonly referred to as Through Hole Technology (THT), also known as perforation insertion assembly technology or perforated insertion technology. In summary, THT is a type of electronic component in which the lead is located in the axial direction (or radial direction) is inserted into the pad hole at a predetermined position on the PCB as the assembled substrate, and then is carried out on the lead-out surface of the PCB. Soldering electronic assembly technology. The typical THT process is a component pre-processing (component lead bending or straightening). A component is inserted into a wave soldering, pin trimming → test one cleaning. The production line consists of component lead bending machine, component pin straightening machine, semi-automatic insertion line body or automatic inserting machine, wave soldering machine, docking station, pin shearing machine, repair welding wire body and test. Equipment and cleaning equipment.