The connecting pin is a mechanical part that can be used as a positioning member to determine the mutual position of the parts. It can also be used as a coupling for transmitting lateral force or torque; or as an overload cut-off part in a safety device.
Connecting pins can be divided into cylindrical connecting pins, tapered connecting pins and special-shaped connecting pins. The cylindrical connecting pins are fixed in the hole by mechanical means, and the size, shape and surface roughness of the connecting pin hole are required to be high, and the assembly Hinge the connecting pin hole before. Generally, the two connected holes should be drilled and reamed at the same time, and the roughness of the hole wall is not more than 0.6m. During the assembly process, lubricate it with oil and push it into the hole with a copper rod.
The connecting pin is generally made of Q235, 35, 45 steel. The cylindrical connecting pin is fixed in the hole through micro-interference, so it is not suitable for frequent installation and disassembly, otherwise it will reduce the positioning accuracy and the reliability of the connection. The conical connecting pin The taper is 1:50, and the small end diameter is the standard value. The conical connecting pin is easy to install, has reliable self-locking performance, and its positioning accuracy is higher than that of the cylindrical connecting pin. It will not affect the positioning accuracy and connection reliability, so it has been widely used.