Hydraulic piping (1) according to the pressure and the use of the occasion to choose the tubing, tubing must have enough strength, the inner wall should be smooth, clean, no sand, no rust, no oxide skin, for long-term storage of the pipe, should be pickling, thoroughly cleaning, flushing, and inspection. (2) when cutting the pipe with a saw, the non-perpendicularity of the section and the axis direction should be ±0.5°, the sharp edge should be blunt and iron scrap should be removed, and the section ellipticity of the section should be 10% when bending the pipe. When the outer diameter is less than 14mm, the elbow can be used by hand or general tools. The elbow radius should be 3 times larger than the outer diameter of the pipe. (3) installation of pipeline requirements are, the line is short, turn as little as possible, the higher part of the pipeline should be equipped with exhaust device, so as to start the exhaust. (4) when installing the rubber hose, sharp turns should be avoided and its bending radius R≥(9~l0)D(D is the outer diameter of the hose). Do not bend near the root of the joint. Make sure that the distance from the hose joint to the beginning bend is L≥6D. The hose should not be twisted when working. (5) the suction pipe should not leak air and should not have too much resistance to prevent cavitation caused by difficult air intake or oil absorption. (6) the return tubing mouth should be extended below the oil level of the oil tank to prevent spatter and bubble. The return pipe of the overflow valve cannot be directly connected with the inlet of the pump. It must pass through the oil tank, otherwise the oil temperature will be too high. (7) all pipeline installation procedures shall be carried out in two times. First, the test assembly shall be conducted, and the pipe joints and flanges shall be spot-welded in the appropriate positions. When all the pipelines pass the test installation, they shall be removed for pickling before formal installation.
2. Other hydraulic components (1) all hydraulic components should be tested for pressure and seal. Before installation, all kinds of automatic control instruments should be checked. (2) when installing various control valves, pay attention to the orientation of oil inlet and oil inlet. When installing valve parts with flange, the screw can not be screwed too tight, too tight sometimes will cause poor sealing. (3) the installation of the hydraulic cylinder should be solid and reliable. In order to prevent the influence of thermal expansion, when the stroke is large and the temperature is high, one end of the cylinder must remain floating. The sealing ring of the hydraulic cylinder should not be too tight, especially the u-shaped ring, so as to avoid excessive resistance. (4) the deviation of coaxiality between the hydraulic pump drive shaft and the motor drive shaft should be less than 0. LMM. Generally, flexible coupling is used for connection. (5) when installing the hydraulic pump, its rotation direction and inlet and outlet should meet the technical requirements. (6) oil absorption height of various hydraulic pumps, generally less than 0.5mm.
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