The work of hydraulic wrench is mainly composed of three parts, the frame is also called shell, oil cylinder and transmission parts. The oil cylinder output force, the oil cylinder piston rod and the transmission part constitute the motion pair. The distance from the center of the oil cylinder to the center of the transmission part is the amplification arm of the hydraulic wrench. The cylinder output multiplied by the force arm is the theoretical output torque of the hydraulic wrench. Due to the existence of friction resistance, the actual output torque of the hydraulic wrench is less than the theoretical output torque.
There are two series of hydraulic spanners: driving type and hollow type. The driving type hydraulic torque wrench is used with standard sleeve. It is a general-purpose hydraulic wrench with wide application range. Hollow type hydraulic torque wrench is thin, especially suitable for small space, suitable for electric power (nuclear power, wind power, hydropower, thermal power), shipbuilding, metallurgy, transportation, construction, aviation and other fields.
Because hydraulic wrench is often used in narrow space and inconvenient transportation during construction, its volume and weight are important indexes. AIPI hydraulic wrench adopts aviation aluminum titanium alloy material and heat treatment method to reduce the size and weight of components.