The structure of auto gate lock switch, gate lock controller and gate lock actuator are introduced.

The executive mechanism of Cu-Al pipe butt welder,based on above,was designed,including its air system and mating clamper.

In order to improve the running smoothness of mesh-belt and reduce the wear between mesh-belt and traction wheel, on the base of completing the design scheme of mechanical system in heat treatment furnace with mesh-belt conveyer, the dimension synthesis of the executive mechanism is accomplished and the main sizes of the mechanism are given.

For the swinging cylinder type of hydraulic wrench, through the analysis and calculation for the locating parameters of its executive mechanism, formula and design precondition of the locating parameters are presented, with which the minimum of pushing force of the oil cylinder can be achieved under definite swinging angle and given loosening & tightening torque for the fasteners.