There are different models of elevators produced in China, with the lifting heights ranging from 4m, 6m, 18m to 100m. Advanced hydraulic systems, motors, pumping stations, explosion-proof devices of hydraulic systems and hydraulic self-locking devices at home and abroad are selected. ? Elevator is not only safe, but also has super load capacity and convenient maintenance.
Special equipment involves boilers, pressure vessels (including gas cylinders, the same below), pressure pipes, elevators, lifting machinery, passenger ropeways, large amusement facilities and special motor vehicles in the field (factory). Among them, boilers, pressure vessels (including gas cylinders) and pressure pipelines belong to pressure-bearing special equipment; Elevator, hoisting machinery, passenger ropeway and large amusement facilities belong to electromechanical special equipment.
Extended data
Elevator principle
Principle of lifter: Hydraulic oil forms a certain pressure through vane pump, enters the lower end of hydraulic cylinder through oil filter, flameproof electromagnetic directional valve, throttle valve, hydraulically controlled one-way valve and balance valve, so that the piston of hydraulic cylinder moves upward and lifts heavy objects. The oil returned from the upper end of hydraulic cylinder returns to the oil tank through flameproof electromagnetic directional valve, and its rated pressure is adjusted through overflow valve, and the reading of pressure gauge is observed through pressure gauge.
The piston of the cylinder moves downward (i.e. the weight drops).
Hydraulic oil enters the upper end of the hydraulic cylinder through the explosion-proof electromagnetic directional valve, and the return oil from the lower end of the hydraulic cylinder returns to the oil tank through the balance valve, the hydraulic control check valve, the throttle valve and the explosion-proof electromagnetic directional valve. In order to make the heavy objects descend steadily and the braking is safe and reliable, a balance valve and a balance circuit are arranged on the oil return passage to maintain the pressure, so that the descending speed is not changed by the heavy objects, and the flow rate is adjusted by the throttle valve to control the vertical speed.
In order to make the braking safe and reliable and prevent accidents, a hydraulic control one-way valve, namely a hydraulic lock, is added to ensure that the hydraulic pipeline can be safely self-locked when it accidentally bursts. An overload sound alarm is installed to distinguish between overload and equipment failure.
The electric control system can control the rotation of the motor through the explosion-proof button to reverse the explosion-proof electromagnetic directional valve, so as to keep the load rising or falling, and the time delay can be adjusted through the "LOGO" program, so as to avoid the inflexible lifting and machine jamming caused by the frequent start of the motor and prolong the service life.
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