Working principle of large lifting platform;
The hydraulic oil forms a certain pressure through the vane pump, enters the lower end of the liquid cylinder through the oil filter, the flameproof electromagnetic directional valve, the throttle valve, the hydraulically controlled one-way valve and the balance valve, so that the piston of the liquid cylinder moves upward and lifts the heavy objects. The oil returned from the upper end of the liquid cylinder returns to the oil tank through the flameproof electromagnetic directional valve, and its rated pressure is adjusted through the overflow valve, and the reading of the pressure gauge is observed through the 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.
Extended data:
Maintenance method:
1, the platform car must be equipped with professional drivers and operators, and after special training, and pass the examination, show certificates.
According to the actual situation of work, the above-mentioned personnel can hold concurrent positions with each other, but those who hold concurrent positions must have their post certificates, which are approved by the competent leaders and bear corresponding responsibilities. After the construction is completed, it is necessary to move the platform car on site, and the platform car should be operated by a professional driver.
2. The platform car driver must carry out various inspections and maintenance according to the mechanical maintenance regulations before starting the platform car. Before work, he should check the working range of the platform car and remove obstacles that prevent the platform car from turning and walking.
3. Leg is an important preparation for the operation of flat car. You should choose a flat land. If the foundation is soft or uneven, be sure to add a wooden pad to ensure that it is correct after actual stress.
Generally speaking, the flatbed should lift the forearm first, then the middle arm, and finally the upper arm. When the platform car rotates, the lower arm can not rotate until it is lifted to a certain height, and the rotation process should be slow. Pay attention to whether the distance between each arm and platform and each device meets the safety requirements.