Nowadays, aerial work platforms, aerial work vehicles and aerial work equipment are becoming more and more popular. However, due to the large temperature difference between different regions, many areas around the world use high-altitude equipment, aerial work vehicles and lifts because of low temperature. Great inconvenience, in order to meet the aerial work platform, aerial work equipment, elevators can run normally and reliably at low temperatures, so in the design and manufacture of aerial work vehicles, aerial work platforms, aerial work equipment, lifts should focus on the following several questions.
The first is the brittle failure of the parts at low temperatures, and the low temperature brittle failure depends on the combination of materials, design and process. When the temperature is lowered, the yield point is increased, the fracture toughness is decreased, and the increase of the yield ratio and the decrease of the plasticity and toughness, the plastic deformation amount before the crack initiation and the resistance of the crack propagation after the cracking are reduced, resulting in the brittleness of the machine parts. The trend is increasing; design: sudden change of section, stress and strain concentration, notch, multiaxial tensile stress state, etc.; welding cracks, unfusion, deterioration of microstructure, residual tensile stress, etc. occur in the process.
Secondly, measures to prevent low temperature brittle fracture, reasonable selection of low temperature steel, welding structure and welding process of low temperature stressed components, parts before welding must be shot blasted, remove oxide layer, remove oil stains and rust marks, and manual welding is strict Control the degree of dryness of the electrode, and the electrode should be dried.
Once again, it is a reasonable choice of hydraulic oil, lubricating grease and diesel oil. The viscosity of hydraulic oil hydraulic oil is very important. The viscosity is too high, the internal frictional resistance of the system increases, the pressure loss increases, the oil temperature rises too fast, the operation delays, the viscosity Too low, the pump has low volumetric efficiency, poor lubrication performance, and increased frictional resistance between components.
The viscosity of the hydraulic oil varies with the working temperature. Therefore, special attention should be paid when selecting the hydraulic oil for low temperature. When the lubricating oil gearbox, transfer case, drive axle, hoisting mechanism, and slewing mechanism are operated at low temperature, the viscosity index of the lubricating oil should be selected. Gear oil with high, low freezing point and good lubricity. Diesel fuel used in low temperature environment should be selected from diesel fuel with less wax, low viscosity, easy atomization and good ignition performance.
Source Vuitton Veedon aerial work platform Aerial work vehicle Aerial work equipment lifts http:// Â
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