When the freight elevator cylinder head itself is used as the piston rod guide sleeve, it is best to use cast iron, and pile brass, bronze and other wear-resistant materials on the guide surface. When the cargo lift is provided with a guide sleeve alone, the guide material is wear-resistant cast iron, bronze or brass, etc., and the guide sleeve is pressed into the cylinder head.
The technical requirements of the freight elevator cylinder head: H8 is used for the diameter matched with the inner diameter of the cylinder, H9 is used for the diameter matched with the buffer plunger on the piston rod, and H9 is used for the diameter matched with the outer diameter of the piston sealing ring. The roundness of these three dimensions And the cylindricity error is not more than half of the tolerance of the respective diameters, and the coaxiality error of the three diameters is not more than 0.03mm.
The structural form of the piston of the hydraulic lifting platform should be selected according to the form of the sealing device. The outside of the piston rod is connected to the load, and its structural form is determined according to the work needs. The piston of the elevator guide ring is made of 20, 35 or 45 gauge steel. The runout of the outer diameter to the piston hole is not more than half of the outer diameter tolerance, and the roundness and cylindricity of the outer diameter are not more than half of the outer diameter tolerance.
The verticality error of the two ends of the piston of the freight lift elevator facing the axis of the piston is not more than 0.04mm on 100mm. The piston rod guide is sleeved in the end cover on the side of the hydraulic cylinder with the rod cavity to guide the piston rod. The inner side is equipped with a sealing device to ensure the sealing of the cylinder cylinder with the rod cavity, and the outer side is equipped with a dust ring to prevent When the piston rod is retracted, impurities, dust and moisture are brought to the sealing device, and the sealing device is damaged.
The structure of the guide sleeve of the electro-hydraulic lifting platform has two types: the end cover type and the plug-in type. The plug-in guide sleeve is easy to disassemble, and the end cover does not need to be removed during disassembly, so it is widely used.
The size of the guide sleeve of the elevator mainly refers to the support length, which is usually determined according to the diameter of the piston rod, the form of the guide sleeve, the pressure bearing capacity of the guide sleeve material, and the maximum side load that may be encountered. Generally, two guide sections are used, and the total length of the guide sleeve should not be too large to avoid too much friction.
