Jack, classification and working principle of various hydraulic jacks

jacks are divided into hydraulic jacks, electric jacks, electric hydraulic jacks, synchronous jacks, ultra-thin jacks, manual hydraulic jacks, self-locking jacks, etc. hydraulic jacks have a compact structure, smooth operation, and self-locking function, so they are widely used. hydraulic jacks are suitable for various lifting operations with small lifting heights. a hydraulic jack consists of main parts such as an oil cylinder, an oil pump, an oil storage tank, a piston, a handle, and a joint. when the hydraulic jack is working, as long as the handle is pulled back and forth, the manual oil pump continuously presses oil into the cylinder. due to the continuous increase in oil pressure in the cylinder, it forces the piston and the heavy objects on the piston to move upward together. open the return valve, and the high-pressure oil in the cylinder will flow back to the oil storage chamber, causing the heavy object and piston to fall together. if the oil volume of the manual pump body is insufficient, it is necessary to add thoroughly filtered n33 # hydraulic oil to the pump before it can work.