Lift Operating Principle: Hydraulic oil is pressurized by a vane pump and flows through an oil filter, an explosion-proof solenoid directional valve, a throttle valve, a pilot-operated check valve, and a counterbalance valve into the lower end of the hydraulic cylinder. This drives the piston upward to lift the load. Return oil from the upper end of the cylinder flows back to the reservoir via the explosion-proof solenoid directional valve. The system's rated pressure is regulated by a relief valve and monitored via a pressure gauge.
For the downward movement of the piston (lowering the load), hydraulic oil enters the upper end of the cylinder through the explosion-proof solenoid directional valve. Return oil from the lower end flows back to the reservoir through the counterbalance valve, pilot-operated check valve, throttle valve, and explosion-proof solenoid directional valve. To ensure smooth, safe, and reliable lowering, a counterbalance valve is installed in the return line; this balances the circuit and maintains pressure, ensuring the descent speed remains constant regardless of the load weight. A throttle valve regulates the flow rate to control the lifting and lowering speeds.
To ensure braking safety and prevent accidents, a pilot-operated check valve (acting as a hydraulic lock) is included to guarantee safe self-locking in the event of a hydraulic line rupture. An audible overload alarm is installed to distinguish between an overload condition and equipment malfunction. The electronic control system uses explosion-proof push-buttons to control motor rotation and the switching of the explosion-proof solenoid directional valve, thereby managing the lifting or lowering of the load. Additionally, a "LOGO" controller adjusts time delays to prevent issues such as sluggish movement or jamming caused by frequent motor starts, ultimately extending the equipment's service life.
