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Extended hydraulic piston pump operation method
Source: China Bearing Network Time: 2017-10-05
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The method of extending the life of the hydraulic piston pump:
The power of the hydraulic system depends mainly on the volumetric power of the hydraulic pump; when the volumetric power drops to 72%; conventional repairs are required; replacement of bearings and aged seals; replacement or correction of friction pairs beyond the cooperative gap; Get rehabilitation.
1. Hydraulic pump: Straight-axis swash plate type piston pump is divided into two types: self-suction type of pressure oil supply type. Most of the pressure supply type hydraulic pumps use air tanks with air pressure; also have hydraulic pumps with hydraulic pumps and hydraulic pumps. The pump inlet port supplies pressure oil. The self-priming oil pump has strong self-priming oil; no external force is required for oil supply. The hydraulic oil tank for pneumatic oil supply; after each engine; it is necessary to wait for the hydraulic stain box to reach the air pressure. Only the operating machinery. If the hydraulic tank lacks air pressure, it will act as a machine; it will form a pull-off appearance in the hydraulic pump and the slippery whip; the abnormal wear of the returning plate and the pressure plate in the pump body will be formed. The oil pump is used for oil supply. Piston pump; after 3000h operation; the operator needs to check the plunger pump 1-2 times a day; check whether the hydraulic pump works normally. If the hydraulic cylinder speed is found to be declining or boring, the fuel pump should be collapsed. See if the edge of the impeller can scratch the surface; whether the internal gear pump gap can be too large.
2. For the self-priming oil type plunger pump; the oil in the hydraulic oil tank should not be lower than the lower limit of the oil mark; the hydraulic oil should be satisfied to meet the quantity. The cleanliness of the hydraulic oil is higher; the longer the service life of the hydraulic pump is.
3. The most important component of the bearing piston pump for hydraulic pump is the bearing; if the bearing shows the play; the normal clearance of the three pairs of friction pairs inside the hydraulic pump cannot be guaranteed; together, the thickness of the hydrostatic bearing oil film of each friction pair is also damaged; The service life of the drop piston pump bearing. According to the information supplied by the hydraulic pump manufacturer; the uniform service life of the bearing is 10000h; beyond this value, it is necessary to replace the new port. The bearing that has been disassembled; no professional testing equipment can not detect Out of the bearing clearance; only visual inspection; if the roller is scratched or discolored, it is necessary to replace it. When replacing the bearing; should pay attention to the original letter and type of the original bearing; Load capacity bearing; the best purchase of the original manufacturer; the original specification of the product; if it is to replace another brand; should consult the personnel who have experienced the bearing to check the table; the intention is to adhere to the bearing's accuracy level and load capacity.
4. Three pairs of friction pair view and correction: the plunger rod and the cylinder hole are replaced according to the replacement specifications of the plunger pump parts; when the various gaps of the parts are out of tolerance; the following methods can be corrected:
(1) The cylinder body is set with copper sleeve; it can be modified by replacing the copper sleeve. Firstly, the diameter of a set of plunger rods is trimmed to the same scale; then the outer diameter is polished with sandpaper of 1000# or more. Three methods: (a) cylinder heating or copper sleeve low temperature freezing kneading; interference installation, (b) with Loctite adhesive installation; this method requires copper casing outer diameter to have a groove (c) cylinder hole tapping; copper sleeve outer diameter machining thread; after coating Lok Thai rubber; screw-in installation.
(2) The cylinder and copper sleeve of the fusion method; the amendments are as follows: (a) using a grinding rod; grinding or modifying the cylinder bore by hand or mechanical means, (b) selecting a coordinate boring machine; ) Use a reamer to correct the cylinder bore.
(3) Select “External Engineering Skills”; the methods are as follows: (a) Electroplating skills: plating a layer of hard chrome on the outer surface of the plunger, (b) brush plating skills: brushing wear-resistant materials on the outer surface of the plunger, (c) Thermal spraying or arc spraying or electric spraying: spraying high-carbon martensite wear-resistant materials, (d) laser welding: welding high-hardness wear-resistant alloy powder on the outer surface of the plunger.
(4) The cylinder block without copper sleeve is mostly made of ductile iron; 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 hole, it is hard and hard. Paired friction pair. If the hole is blindly ground; the outer surface of the inner wall of the cylinder hole is grounded; the more and more the layout function of the friction is changed. The friction pair of the coating is removed; if it is forcibly used, it will rub. The surface temperature rises sharply; the plunger rod and the cylinder hole are glued together.
5. In addition, a common film coating is prepared on the outer surface of the plunger rod; the coating is rich in wear reduction + wear resistance + smooth function; the friction pair practice is still hard-soft pairing; once the coating is changed by human; The friction pair that damaged the best pairing data; repair these special plunger pumps; it must be sent to a professional repair plant.
6. The sliding friction between the sliding shoe and the swash plate sliding shoe and the swash plate is the most messy pair of the three pairs of friction plates of the swash plate plunger pump. Table 1 lists the gap between the plunger rod ball head and the sliding ball socket (see Table 2); If the gap between the plunger and the sliding shoe is too poor; the high-pressure oil in the plunger cavity will be released from the gap between the plunger ball and the sliding shoe; the sliding shoe and the swash plate oil film are reduced.惭 惺 惺 惺 惺 ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( Replacement of the group. Table 2 plunger rod and cylinder bore plunger rod diameter φ16 φ20φ25φ30φ35φ40 specification gap 0. 0150. 0250. 0250. 0300. 0350. 040 limit clearance 0. 0400. 0500. 0600. 0700. 0800. 090 plunger The ball head and the sliding ball ball socket specification gap 0. 0100. 0100. 0150. 0150. 0200. 020 limit clearance 0. 300. 300. 300. 350. 350. 35
7. After the swash plate effect for a period of time; the swash plate plane will show a concave surface; before the channel is selected for grinding; firstly, the original scale and the plane hardness should be measured. After grinding; then the amount of grinding is measured; if it is within 0.18 There is no obstacle to the application of the plunger pump. If it exceeds 0.2 mm or more, the nitriding method should be used to maintain the thickness of the original nitride layer.
8. When the swash plate plane is scraped out of the groove by the plunger ball head; the laser welding alloy powder can be used for correction. The laser welding skill can ensure the connection strength of the data; and the hardness of the flux-filling data can be ensured; Not all the hardness of the surrounding arrangement is reduced. The chrome phase electrode is also used for the surfacing welding; the surface of the swash plate that has been repaired must be heat treated from the beginning; the best choice is the heat treatment of the nitriding furnace. No matter which method is adopted to correct the swash plate; Rehabilitation original scale accuracy, hardness and appearance roughness.
9. The correction distribution plate of the distribution plate and the cylinder distribution surface has two modes: plane distribution and spherical distribution. The friction pair of the spherical surface distribution; when the surface of the cylinder is slightly shallow; after the grinding method, the cylinder distribution groove When the groove is deep; the groove should be filled after the “external engineering skill” method is used; then grinding; no blind grinding; to prevent the copper layer from becoming thin or leaking out of the steel base. The precision of the friction pair in the plane distribution method can be compared Grinding on high channels. The cylinder and the distribution plate should be measured before grinding; the total thickness scale and the scale that should be ground should be measured first; then compensated to the adjustment pad. When the grinding disc is large, the heat should be heat-treated after grinding; Guarantee the hardness of the hardened layer. Plunger pump parts hardness specification plunger rod recommended hardware HS84 plunger rod ball head referral hardness
10, the length of the life of the plunger pump; with the usual protection and protection; the amount and quality of hydraulic oil; oil cleanliness, etc. to prevent the particles in the oil against the wear of the piston pump wear; etc.; An effective way to plug the pump life. Replace parts in repairs should use the original parts; these parts are sometimes more expensive than other imitation parts; but the quality and stability are better; if it is cheap to buy imitation parts; short-term It seems to save money; but it brings danger; it may also cause more damage to the use of the plunger pump.
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