Causes of leakage in the hydraulic system of the electric lifting platform: 1. The selection of seals for the electric lifting cage
platform: the reliability of the hydraulic system depends to a large extent on the design of the hydraulic system seal and the choice of seals. The seal structure is not selected in the design. Reasonable, the selection of seals is not up to standard, and the compatibility of hydraulic oil and sealing materials, load conditions, ultimate pressure, working speed, and changes in ambient temperature are not considered in the design. These all directly or indirectly cause hydraulic system leakage to varying degrees. In addition, due to dust and impurities in the operating environment of construction machinery, appropriate dust-proof seals should be selected in the design to prevent dust and other dirt from entering the system to damage the seal and contaminate the oil, thereby causing leakage. 2. Other design reasons: In the design, considering that the geometric accuracy and roughness of the moving surface is not comprehensive enough, and the strength of the connection part is not checked in the design, these will cause leakage in the work of the machine. 3. Oil pollution and component damage (1) Electric lifting cage platform gas pollution: Under atmospheric pressure, about 10% of the air can be dissolved in the hydraulic oil, and under the high pressure of the hydraulic system, more will be dissolved in the oil. Air or gas. Air forms bubbles in the oil. If the hydraulic support changes rapidly between high and low pressure in a very short time during the working process, the bubbles will generate high temperature on the high pressure side and burst on the low pressure side. If the hydraulic system components When there are pits and damage on the surface, the hydraulic oil will rush to the surface of the component at a high speed to accelerate surface wear and cause leakage. (2) Particle pollution of the electric lifting platform hydraulic cylinder is the main executive element of some construction machinery hydraulic systems. Because the piston rod is exposed to the outside and directly contacts the environment during the working process, although the guide sleeve is equipped with dustproof rings and seals, but It is also inevitable that dust and dirt will be brought into the hydraulic system, which will accelerate the scratches and wear of the seals and plug rods, which will cause leakage. Particle pollution is one of the fastest factors in the damage of hydraulic components. 4. Part damage: The seal is made of oil-resistant rubber and other materials. The aging, cracking, and damage caused by long-term use will cause system leakage. If the parts are damaged by collision during work, it will scratch the sealing element and cause leakage. Take the following measures: 1. When designing and manufacturing hydraulic components, try to reduce the height of the gap under the conditions allowed by the structure and process. 2. Joint surfaces such as joints, cover plates, plate connections, etc. must ensure reasonable surface roughness values; and ensure that the bolts are tightened tightly during assembly. 3. Avoid leaving spiral machining marks on the sealing surface of the rotating shaft. 148.
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