The General Administration of Quality Supervision, Inspection and Quarantine of the revised "special equipment catalog", carrying 500 kg or less lifts are not special equipment.
Domestic production of lifts, product models, lifting height of 4 meters, 6 meters, 18 meters and even up to a hundred meters. Selection of domestic and foreign advanced hydraulics, motors, pumping station systems, hydraulic system explosion-proof devices and hydraulic self-locking device. The elevator is both safe and has a large load capacity, and easy maintenance.
And special equipment involved in life safety, the greater danger of boilers, pressure vessels (including gas cylinders, the same below), pressure piping, elevators, lifting machinery, passenger ropeways, large amusement rides and the field (factory) within the special-purpose motor vehicles. Among them, boilers, pressure vessels (including gas cylinders), pressure piping for pressurized special equipment; elevators, lifting machinery, passenger ropeways, large amusement rides for electromechanical special equipment.
Expanded
Lift principle
Lift principle: hydraulic oil from the vane pump to form a certain pressure, through the oil filter, explosion-proof electromagnetic directional valves, throttle valves, liquid-controlled check valve, counterbalance valves into the lower end of the cylinder, so that the cylinder piston upward movement to lift the heavy object, the upper end of the cylinder oil return by explosion-proof electromagnetic The return oil from the upper end of the cylinder is returned to the oil tank through the explosion-proof electromagnetic directional valve, and its rated pressure is adjusted through the relief valve, and the reading value of the pressure gauge is observed through the pressure gauge.
The piston of the hydraulic cylinder moves downward (the weight falls).
Hydraulic oil enters the upper end of the cylinder through the explosion-proof electromagnetic reversing valve, and the return oil from the lower end of the cylinder goes back to the tank through the balancing valve, liquid-controlled check valve, throttle valve, and explosion-proof electromagnetic reversing valve. In order to make the weight fall smoothly, brake safe and reliable, set the balance valve in the return oil circuit, balance the circuit, maintain the pressure, so that the falling speed is not subject to changes in the weight, adjust the flow rate by the throttle valve, control the speed of lifting and lowering.
In order to make the braking safe and reliable, to prevent accidents, increase the hydraulic check valve, that is, the hydraulic lock, to ensure that in the hydraulic pipeline accidental burst can be safe self-locking. Overload sound alarm is installed to distinguish overload or equipment failure.
Electronic control system can be controlled by explosion-proof button to control the rotation of the motor, so that the explosion-proof electromagnetic directional valve reversal, to keep the load lifting or lowering, and through the "LOGO" program to adjust the amount of time delay, to avoid frequent starting of the motor caused by the lifting and lowering of the inflexible, jamming phenomenon, prolonging the service life.
Baidu Encyclopedia-Lift
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