A hydraulic lift is a type of lifting equipment composed of a traveling mechanism, a hydraulic mechanism, an electric control mechanism, and a support mechanism. 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 to enter the lower end of the hydraulic cylinder, causing the piston to move upward and lift the load. The oil returning from the upper end of the cylinder returns to the oil tank via the explosion-proof solenoid directional valve. The rated pressure is adjusted by a relief valve, and the pressure is observed through a pressure gauge.
When the piston moves downward (i.e., the load descends), hydraulic oil enters the upper end of the cylinder via the explosion-proof solenoid directional valve. The oil returning from the lower end of the cylinder returns to the oil tank via the balance valve, hydraulic check valve, throttle valve, and explosion-proof solenoid directional valve. To ensure smooth descent and reliable braking, a balance valve is installed on the return oil line to balance the circuit and maintain pressure, ensuring the descent speed is not affected by the load. The flow rate is adjusted by the throttle valve to control the lifting speed. To ensure braking safety and prevent accidents, a hydraulically controlled check valve, also known as a hydraulic lock, is added to ensure safe self-locking in the event of an accidental rupture of the hydraulic line. An overload audible alarm is installed to distinguish between overload and equipment malfunction.
The electrical control system controls the motor rotation and the switching of the explosion-proof solenoid directional valve via explosion-proof buttons SB1-SB6 to maintain load increase or decrease. The time delay is adjusted through the "LOGO" program to prevent frequent motor starts and extend its service life.
