Cavity formula hydraulic torque spanner

The utility model discloses a cavity formula hydraulic torque spanner, including wrench body and set up the ratchet on wrench body, the top of ratchet is provided with the pawl, and wrench body's one end is provided with the planking, and wrench body's bottom is provided with and increases the spring, and the top that increases the spring is provided with closes the spring, wrench body's the built -in piston that is provided with, the inside of piston is provided with the piston rod, the top of piston is provided with the hydro -cylinder, wrench body's top is provided with the joint, connect with the piston between be connected through inner structure, this kind of cavity formula hydraulic torque spanner, piston rod special treatment, it is wear -resisting, reduce the wearing and tearing of aluminium system hydro -cylinder, improve aluminium system hydro -cylinder life greatly, special design's aluminium system casing appearance, the instrument of having guaranteed can use for a long time, has prolonged life,