The right way to extend the life of a hydraulic plunger pump

The efficiency of the hydraulic system depends mainly on the volumetric efficiency of the hydraulic pump. When the volumetric efficiency drops to 72%, routine maintenance, replacement of bearings and aged seals, replacement or repair of friction pairs beyond the mating clearance are required, Be restored. 1, hydraulic pump: Straight shaft swash plate piston pump is divided into two types of self-suction oil pressure type. Most of the pressure supply type hydraulic pump with air pressure tank, there are hydraulic pump itself with a charge pump to the hydraulic pump inlet to provide pressure oil. Self-priming oil pump self-priming oil capacity, no external oil supply. Hydraulic pressure oil tank, each time you start the machine, you must wait for the hydraulic pressure tank to reach the use of pressure, to operate the machine. If the pressure of the hydraulic tank is low, it will cause the pull-off phenomenon in the hydraulic pump and the slippery whip, which will cause abnormal wear of the return plate and the pressure plate in the pump body. The use of charge pump piston pump, use 3000h, the operator needs to check the plunger pump 1-2 times a day to check the hydraulic pump running sound is normal. If you find the hydraulic cylinder speed or boring car, you should disassemble the charge pump check, check the edge of the impeller scratches, internal gear pump clearance is too large. 2, For self-priming oil type plunger pump, the oil in the hydraulic tank should not be lower than the lower limit of the oil standard, and a sufficient amount of hydraulic oil should be kept. The higher the cleanliness of the hydraulic fluid, the longer the life of the hydraulic pump. 3, the most important component of the hydraulic pump piston pump bearing is the bearing, if the bearing appears clearance, you can not guarantee the internal hydraulic pump three pairs of normal wear vice, but also will destroy the friction of the hydrostatic support film thickness, Decrease the life of plunger pump bearings. According to information provided by the hydraulic pump manufacturer, bearing the average service life of 10000h, more than this value will need to replace the new port. Demolition of the bearings, there is no professional testing equipment can not detect the bearing clearance, only visual inspection, such as the roller surface scratches or discoloration, it must be replaced. In the replacement of bearings, bearings should pay attention to the original letters and models, most of the piston pump bearing load capacity of large bearings, it is best to buy the original manufacturer, the original specifications of the product, if the replacement of another brand, should consult the bearing experience Staff look-up table swap, the purpose is to maintain the bearing accuracy level and load capacity. 4 pairs of friction pair inspection and repair: plunger rod and cylinder bore replacement parts according to the plunger pump parts, when the various parts of the gap tolerance can be repaired as follows: (1) cylinder inlay Copper sleeve, copper sleeve can be replaced by the method of repair. First set a set of plunger rod diameter trim to a uniform size, and then over 1000 # polished sandpaper outside diameter. Cylinder installation copper sleeve of three ways: (a) cylinder warm or copper sleeve low temperature cryogenic extrusion, interference assembly; (b) mining with Loctite adhesive assembly, which method we require copper jacket Diameter surface of the groove; (c) cylinder tapping, copper outer diameter of the thread, Tu Le Ta plastic, screw into the assembly. (2) The cylinder and the copper sleeve fused by means of sintering are as follows: (a) grind and repair the cylinder hole by using a grinding rod, manual or mechanical method; (b) re-boring the cylinder bore by using a coordinate boring machine; (c Reamer cylinder bore repair. (3) adopt "surface engineering technology", the method is as follows: (a) electroplating technology: a layer of hard chrome plating on the plunger surface; (b) electroplating technology: brushing wear- Thermal spraying or arc spraying or electrospraying: spraying high-carbon martensite wear-resistant material; (d) laser welding: welding high hardness wear-resistant alloy powder on the plunger surface. (4) Cylinder hole copper-free sleeve cylinder material is mostly ductile iron, the cylinder wall to prepare amorphous film or coating. Because of this special material on the inner wall of the cylinder bore, it is possible to form a hard-hard paired friction pair. If you blindly grind the cylinder bore, the surface material inside the bore of the cylinder bore is removed and the more structural properties of the friction change. Was removed from the coating friction pair, if forced to use, the friction surface temperature will rise sharply, the plunger rod and cylinder bore bonding 5, the other in the plunger rod surface prepared a unique thin film coating, the coating containing minus Wear + wear + lubrication function, this group is still a real pair of friction - soft pair, once people change the coating, it also destroyed the friction pair of the best matching materials, repair these special plunger pump, it is necessary to send Professional repair shop.