Lifting Mechanism Principle: Hydraulic oil, pressurized by a vane pump, passes through an oil filter, explosion-proof solenoid directional valve, throttle valve, hydraulic check valve, and balance valve before entering the lower end of the hydraulic cylinder. This causes the piston in the cylinder to move upward, lifting the load. Oil returning from the upper end of the cylinder flows back to the oil tank via the explosion-proof solenoid directional valve. The rated pressure is adjusted by the relief valve, and the pressure is observed using a pressure gauge.
When the piston in the cylinder moves downward (i.e., the load descends), hydraulic oil enters the upper end of the cylinder via the explosion-proof solenoid directional valve. Oil returning from the lower end flows back 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 unaffected by the load. The flow rate is adjusted by the throttle valve to control the lifting speed.
To ensure reliable braking and prevent accidents, a hydraulic check valve (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 electronic control system can control the motor rotation via explosion-proof buttons, causing the explosion-proof electromagnetic reversing valve to switch directions to maintain load lifting or lowering. The time delay can be adjusted via the "LOGO" program to avoid frequent motor starts that could cause inflexible lifting or jamming, thus extending the service life.
