Classification introduction, working principle, standard characteristics, purchasing skills and classification Telescopic aerial work platforms are mainly divided into straight arm aerial work platforms and curved arm aerial work platforms. It is mostly used in places with high requirements, such as shipyards. This kind of machine is safe and easy to move, but the cost is very high. Working principle: the hydraulic oil forms a certain pressure through the vane pump, and enters the lower end of the hydraulic cylinder through the oil filter, the flameproof electromagnetic directional valve, the throttle valve, the hydraulic control one-way valve and the balance valve, so that the piston of the hydraulic 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 reversing 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. Standard features: the working height ranges from 14.20m to 43m, the function of self-leveling working platform, the omni-directional control handle of Hall effect, the stable diesel drive and two-speed walking function, and the quick lifting function of 12v DC auxiliary power supply platform. Tips 1: Don't blindly buy the AC power cord of the work platform, but do sufficient market research and field investigation to determine the scale and reputation of its company. This is the first and necessary. At present, many small-scale enterprises in the market have greatly reduced the quality of lifting products in order to cut corners with violence. Although they will be sold very cheaply, this kind of machinery does not take long and has a high risk factor. Therefore, as a buyer, you can't covet petty advantages and cause greater regret. Two: According to the data you investigated, the crane with better selective price should be selected from its technical parameters, practicability and universality. As a customer, you should make a purposeful choice, that is, what to do when buying lifting machinery, what kind of lifting machinery can meet your needs and have many uses. Third: Finally, after the equipment arrives, it is necessary to check whether the accompanying technical data are complete, whether the accompanying accessories, tools and accessories conform to the list, and whether the equipment and accessories are damaged or defective, and make a record of unpacking acceptance.