Hydraulic scissor lifts raise and lower cargo platforms by unfolding and folding a scissor-type support frame. Power is provided by the extension and retraction of hydraulic cylinders, which drive the scissors to unfold and fold. Its scissor mechanism provides high stability during lifting, and its large working platform and high load capacity allow for a wider range of aerial work and are suitable for multiple people working simultaneously. It makes aerial work more efficient and safer. Because the extension and retraction speed of the hydraulic cylinder is determined by the flow rate of the oil pump, the cylinder speed is generally designed to be very slow, around 200 mm/min, and the diameter of the oil inlet pipe connected to the cylinder is Φ6 mm. In the event of a pipe breakage, the hydraulic oil can only return through the Φ6 mm inlet, so the descent speed is also very slow, thus preventing damage and loss.
Hydraulic oil is pressurized by a vane pump and passes through an oil filter, explosion-proof solenoid directional valve, throttle valve, hydraulic check valve, and balance valve into the lower end of the hydraulic cylinder, causing the piston of the hydraulic cylinder to move upward and lift the heavy object. The oil returning from the upper end of the hydraulic cylinder returns to the oil tank through the explosion-proof solenoid directional valve. Its rated pressure is adjusted by the relief valve, and the pressure gauge reading is observed.
