Piston pump maintenance and use
Mechanical maintenance The plunger pump that uses the oil pump to supply oil, after 3000 hours of use, the operator needs to check the plunger pump 1-2 times a day to check whether the sound of the hydraulic pump is normal. If the speed of the hydraulic cylinder is found to be degraded or boring, the charge pump should be disassembled to check whether there is any scratch on the edge of the impeller, and whether the clearance of the internal gear pump is too large. For self-priming piston pumps, the oil in the hydraulic tank should not be lower than the lower limit of the oil mark, and a sufficient amount of hydraulic oil should be maintained. The higher the cleanliness of the hydraulic fluid, the longer the service life of the hydraulic pump.
The most important part of the plunger pump is the bearing. If there is clearance in the bearing, the normal clearance of the three pairs of friction pairs inside the hydraulic pump cannot be guaranteed, and the thickness of the hydrostatic bearing oil film of each friction pair is also destroyed, and the piston pump bearing is reduced. Service life. According to the information provided by the hydraulic pump manufacturer, the average service life of the bearing is 10000h. If this value is exceeded, a new port needs to be replaced. The disassembled bearing can not detect the clearance of the bearing without professional testing equipment. It can only be visually tested. If it is found that the surface of the roller is scratched or discolored, it must be replaced.
When replacing the bearing, pay attention to the original letter and model of the original bearing. Most of the piston pump bearings use large load capacity bearings. It is best to buy the original manufacturer, the original specification of the product. If you change another brand, you should consult the bearing. The personnel check the table to change, the purpose is to maintain the bearing's accuracy level and load capacity.
The length of the life of the plunger pump is related to the usual maintenance, the quantity and quality of the hydraulic oil, and the cleanliness of the oil. It is also an effective way to prolong the life of the plunger pump by avoiding the particles in the oil causing wear on the piston pump friction pair. Replace parts in repairs should use original parts as much as possible. These parts are sometimes more expensive than other counterfeit parts, but the quality and stability are better. If you buy cheap counterfeit parts, it seems to save money in the short term. However, this brings about hidden dangers and may also cause greater harm to the use of the plunger pump.
The distribution plate has two forms: plane distribution and spherical distribution. The friction pair of the spherical surface distribution is repaired by grinding means when the surface of the cylinder is slightly shallow; when the groove of the distribution surface of the cylinder is deep, the surface should be filled with "surface engineering technology" and then ground. Do not blindly grind, in order to prevent the copper layer from thinning or leaking oil out of the steel base.
Mechanical use The plunger pump cylinder is fitted with a copper sleeve, which can be installed by replacing the copper sleeve. First, the diameter of a set of plunger rods is trimmed to a uniform size, and the outer diameter is polished with a sandpaper of 1000# or more.
Three ways to install the copper sleeve in the cylinder:
(a) cylinder heating or hot-pressing of copper sleeves, interference assembly;
(b) The Loctite adhesive assembly is used, which requires a groove on the outer diameter surface of the copper outer casing;
(c) Cylinder hole tapping, copper sleeve outer diameter machining thread, after coating Loctite glue, screw into the assembly.
The cylinder and copper sleeve of the fusion-fired combination method are as follows:
(a) grinding or repairing the cylinder bore by grinding or by manual or mechanical means;
(b) Re-twisting the cylinder bore using a coordinate boring machine;
(c) Repair the cylinder bore with a reamer.
(3) Adopt "surface engineering technology" as follows:
(a) Electroplating technique: plating a layer of hard chrome on the surface of the plunger;
(b) Brush plating technology: brushing the surface of the plunger with wear-resistant material;
(c) thermal spraying or arc spraying or electro spraying: spraying high carbon martensite wear resistant materials;
(d) Laser cladding: A high hardness wear-resistant alloy powder is deposited on the surface of the plunger.
(4) The cylinder material of the cylinder hole without copper sleeve is mostly ductile iron, and an amorphous film or coating is prepared on the inner wall of the cylinder. Because of the special material on the inner wall of the cylinder bore, a hard-hard paired friction pair can be formed.
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