There are many kinds of materials used in the hydraulic cylinder of the stationary scissor lift table, but there are only a few common ones: the raw materials often used in the hydraulic cylinder are 35 gauge seamless steel pipe, 20 gauge seamless steel pipe, and 45 gauge Seamless steel tube material. Because the mechanical properties of No. 20 steel raw materials are slightly lower and cannot be quenched and tempered, it is usually used less in the process of use. Use No. 35 seamless steel pipe material with relatively better welding performance to weld the cylinder, For parts such as cylinder bottom, cylinder head pipe joint, and trunnion, it needs to be tempered after rough machining, and the effect will be better. For the welding of other parts, the fixed scissor lift usually uses 45 gauge seamless steel pipe material, and should be quenched and tempered to 240-285HB after rough machining. Cylinder block forged steel, cast iron, cast steel can be used for zg35b and other materials, cast iron can be between several types of ht200-ht350 or ductile iron, alloy materials can be used in special cases.
The surface roughness of the inner hole of the hydraulic cylinder used by the stationary scissor lift platform is H8/9, if a rubber sealing ring is used, R 0.1—0.4um, if a piston ring is used to seal the piston, RA 0.2—0.4um, and both need to be ground.
The cylinder inner diameter roundness tolerance value is 10 grades, and the cylindricity tolerance value should be 8 grades.
The verticality tolerance of the end face of the hydraulic cylinder is screened according to the 7-level precision.
If the thread of the cylinder block and cylinder head, the metric thread is grade 6 accuracy.
In order to prevent corrosion and improve the service life of the cylinder, the surface of the cylinder wall should be chrome-plated with a thickness of 30-40, chrome-plated to complete honing and polishing.
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