Hydraulic oil from the vane pump to form a certain pressure, through the oil filter, flameproof type solenoid directional valve, throttle valve, hydraulic control valve, balance valve into the lower end of the liquid cylinder, so that the piston upward movement of the liquid, lifting the heavy weight, the upper end of the tank back oil through the explosion-proof solenoid reversing valve back to the tank, the pressure through the overflow valve to adjust, through the pressure gauge to observe the
The piston of the liquid cylinder moves downward (both weight drops). Hydraulic oil through the explosion-proof solenoid valve into the upper end of the liquid cylinder, the lower end of the oil through the balance valve, hydraulic control valve, throttle, flameproof solenoid reversing valve back to the tank. In order to reduce the weight of the smooth, braking safe and reliable, in the return circuit set balance valve, balance loop, maintain pressure, so that the drop speed is not subject to heavy weight and change, from the throttle valve regulation flow, control the Take-off and landing speed. In order to make the brake safe and reliable, to prevent accidents, increase the hydraulic control one-way valve, that is, to ensure that the hydraulic pipe burst when the accident can be safely self-locking. An overloaded voice alarm is installed to distinguish between overloading or equipment failure.
Electrical control system through the explosion-proof button sb1-sb6 to control the rotation of the motor, flameproof solenoid reversing valve reversing, in order to maintain the load rise or fall, and through the "logo" program to adjust the time delay, to avoid frequent motor start and affect the service life.