After a certain amount of wear and tear, the stainless steel gear pump should be well inspected and repaired
2020/08/01 15:54:48
After a certain amount of wear and tear of the stainless steel gear pump, a good inspection and repair shall be carried out, maintenance and repair shall be carried out according to a certain method and principle, and the arrangement and setting shall be carried out in time.
The internal surface wear of the stainless steel gear pump is mainly the arc-shaped working surface of the oil suction section. If there is slight abrasion, use oilstone to remove burrs. The pump body is made of cast iron casting blanks, and new parts should be replaced when severe wear occurs.
The end cover of the stainless steel gear pump is made of cast iron. After abrasion, it can be slightly ground and smoothed on the flat plate. If the wear is serious, it should be ground and smoothed on a surface grinder. After grinding, the plane contact between the end cover and the pump body should not be less than 85%. The flatness tolerance, the perpendicularity tolerance of the end face to the center line of the hole, the parallelism tolerance of both ends and the center of the two-axis hole The parallelism tolerance of the lines is 0.01mm. The surface roughness Ra after grinding should not be greater than 1.25μm. If both ends of the internal gear of the pump are repaired by grinding, the width dimension of the pump body must be changed to be the same as the size removed by grinding at both ends of the gear. The reworked two ends of the pump body should meet the standard technical requirements.
The wear of the shaft in the stainless steel gear pump is mainly due to the friction and wear between the two ends of the shaft and the supporting needle roller, which makes the shaft diameter smaller. If it is slightly worn, the diameter of the shaft at this part can be increased by plating a layer of hard chrome, so that the shaft can be repaired. If the shaft is severely worn, it should be remanufactured with 45 steel or 40Cr steel. After roughing and finishing the shaft, the bearing part should be heat treated to a hardness of HRC60-65, and then ground to make the surface roughness of the bearing mating part Ra not Greater than 0.32μm; the roundness and cylindricity tolerance of the shaft is 0.005mm; the matching part with the gear is H7/h6, and the surface roughness Ra should not be greater than 0.63μm.
Stainless steel gear pumps have the characteristics of wide application range, strong corrosion resistance, high conveying viscosity, low noise, and high efficiency. Our company can customize stainless steel gear pumps with various flow rates and pressures to meet the needs of different customers. Stainless steel gear pumps can Transporting corrosive lubricating media, regardless of the viscosity of the media, can be used in different industries, and give full play to its good role and value in the industry, but there will be certain wear conditions during use, and wear parts of gears Mainly the tooth meshing, involute working surface and the two ends of the gear plane. When the tooth surface is slightly worn, the tooth surface can be polished with whetstone, and both ends are flat and polished on a flat plate. When the gear tooth surface is severely worn, a new gear should be replaced. If only the two ends of the gear are worn, they can be ground and polished on a surface grinder. The reasons for the wear of stainless steel gear pumps are mainly manifested in the following main aspects.
After the parts in the stainless steel gear pump are repaired, the bearing needle rollers should be replaced. The requirements for needle rollers are: the dimensional error of the diameter of all needle rollers should not exceed 0.003mm, the length tolerance is 0.1mm, and the clearance with the shaft should be about 0.01mm; when assembling the needle rollers, the bearing shell should be filled according to the quantity requirements. The needles should be arranged parallel to each other. Gear pump manufacturers and suppliers from China
