The safety clutch type is a safety clutch mechanism that trips when a certain torque is reached to complete the structural type of the threaded component. The impact type uses an impact mechanism to complete the structure of the threaded component with its impact torque. The former is simple in structure, has small output torque, and has a certain reaction torque. Generally, it is only suitable for manufacturing electric wrenches of M8mm and below; the latter has a complicated structure and high manufacturing process requirements, but its output torque is large and the reaction torque is large. Very small, generally suitable for the manufacture of larger size electric wrenches.
The impact type electric wrench is composed of an electric motor, a planetary gear reducer, a ball spiral groove impact mechanism, a positive and negative power switch, a power connection device and a motorized sleeve.
The impact type electric wrench has a single-phase series-excited electric wrench and a three-phase electric wrench according to the type of the selected motor.
The motor unit of the single-phase series-excited electric wrench is housed in a plastic case. The plastic housing serves both as a structural component for supporting the motor and as an additional insulation for the stator of the motor. Since the impact type electric wrench is assembled or disassembled, there is a large axial pulling force between the end face of the plastic casing of the device motor and the plastic front cover of the planetary gear reducer and the ball spiral groove impact mechanism, and the planetary gear The reducer requires high assembly precision, so metal inserts are provided at the end of the plastic casing, the bearing chamber and the threaded joint to enhance the rigidity of the outer casing, improve the machining precision of the plastic outer casing and the axial force of the joint. ability.
