10 aspects of the hydraulic piston pump repair instructions

???? Method to extend the service life of hydraulic piston pump: hydraulic efficiency of the system depends mainly on the volumetric efficiency of the hydraulic pump when the volumetric efficiency dropped to 72%, you need routine maintenance, replacement of bearings and aging seals, to replace or repair beyond the friction pair with the gap, its performance is restored.

???? A hydraulic pump: direct axis swashplate piston pump is divided into the type of pressure oil oil absorption two. Pressure oil hydraulic pump were powered by air pressure tank, there are also hydraulic pump itself with fill oil wheel cylinder to the hydraulic pump inlet pressure of the oil. Oil absorption-type hydraulic pump oil absorption capacity, strong, no external oil supply. Hydraulic pressure oil tank every time you start the machine, hydraulic stains box must wait to use pressure in order to operate machinery. Served as machines such as hydraulic tank pressure is low, would hydraulic pump with whip slip caused by the pull-off phenomenon that can cause abnormal wear of the pump body return plate and platen. Fill the fuel supply to the piston pump, using the 3000h, operating daily check on the piston pump 1-2 times to check the hydraulic pump running sound is normal. Such as hydraulic cylinders slowed down or stuffy car, you should check the disintegration of the charge pump, check the impeller edge scratched the gear pump gap is too large.

???? Oil from the oil absorption-type piston pump, hydraulic tank shall not be less than the lower limit of the oil standard, to maintain a sufficient number of hydraulic oil. The higher the cleanliness of the hydraulic oil, hydraulic pump, longer service life.

???? 3, the most important components of the hydraulic pump bearing piston pump bearings, if the bearing clearance can not guarantee that the internal pump friction pair of the normal gap, but also undermine the hydrostatic bearing oil film thickness of the friction pair reduce the bearing life of the piston pump. According to the information provided by the hydraulic pump manufacturer, the average service life of bearings 10000h, more than this value will need to replace the new port. Bearing removed, there is no professional testing equipment can not detect the bearing clearance, and only by visual observation, such as the roller surface scratches or discoloration, it must be replaced. When changing the bearings, should pay attention to the letters of the alphabet and model of the original bearings, piston pump bearing most of the large load capacity of bearings, it is best to buy the original manufacturers original specifications, if the replacement of another brand, they should consult experienced in bearing personnel table lookup on the change, the purpose is to maintain the accuracy class and load bearing capacity.

???? 4, three pairs of friction pair inspection and repair: the plunger rod and cylinder bore piston pump replacement of standard parts, when parts of a variety of clearance when the ultra-poor, according to the following methods of repair: (1) cylinder inserts installed copper sleeve, you can use the method of repair of replacement of copper. A plunger rod diameter trimmed to a uniform size, then more than 1000 # sandpaper to polish the outer diameter. Cylinder to install the copper sets of three methods: (a) cylinder plus warm loaded or copper sets of cryogenic squeeze interference assembly; (b) mining Loctite adhesive with assembly, this we approach requires the copper jacket diameter surface of the groove; (c) tapping of the cylinder bore, copper sleeve OD threading, coating of Loctite glue, screw assembly.

???? (2) melting the binding mode of the cylinder with copper sleeve, repair as follows: (a) using ground rods, manual or mechanical grinding to repair the cylinder hole; (b) using a jig boring, re-boring the cylinder hole; (c ) reamer to repair the cylinder bore.

???? (3) "surface engineering", as follows: (a) plating technology: the plunger surface hard chromium plated layer; (b) Brush Plating Technology: plunger surface plating wear-resistant materials; (c) thermal spraying or arc spraying or electric spray: spraying carbon martensite wear-resistant materials; (d) Laser cladding: deposited in the plunger surface melting high hardness wear-resistant alloy powder.

???? (4) cylinder bore copper sleeve cylinder materials are ductile iron, Preparation of amorphous thin film or coating on the cylinder inner wall. Cylinder bore wall with this special material, to form a hard - hard matching friction pair. Blindly grinding cylinder bore, research out of the cylinder bore wall surface materials, the friction is more structural performance has changed. Remove the coating friction pairs, if forced to use will be friction surface temperature increased sharply, the plunger rod and cylinder Fasheng glue.

???? 5, another surface of the plunger rod preparation of a unique thin film coating, the coating containing antifriction + wear + lubricating, the friction pair is the actual or hard - soft matching people to change the coating, there is damage the friction pair of the best matching materials, repair, piston pump, it is necessary to a professional repair shop.

???? 6, the sliding friction of the slipper and swash plate slipper and swash plate is the most complex in the friction pair of the swash plate piston pump. Table 1 lists the plunger rod ball slipper ball and socket clearance (see Table 2), if the plunger and slipper gap tolerance, high pressure oil in the plunger cavity from the ball plunger and slipper gap leaking out of the slipper and swash plate film thinning, can cause severe hydrostatic bearing failure, the slipper and swash plate metal contact friction, ablation off of the slipper, scratching of the ball plunger swash plate. The ball and socket of the plunger rod ball and slipper beyond the tolerance of 1.5 times, replacement of the group.

???? 7, the role of the swash plate for some time, the swash plate plane will appear concave phenomenon, before the use of platform grinding, first to measure the original size and print hardness. After grinding, and then measuring a grinding amount is how much, such as 0.18 or less, piston pumps use no hindrance; If you exceed 0.2mm, should nitride to maintain the original thickness of the nitrided layer.

???? 8, the plane of the swash plate ball plunger scrape out the trench, can be laser cladding alloy powder to repair. The laser cladding technique can guarantee the bond strength of the material, but also ensures that the hardness of the complement refractory materials, and do not all reduce the hardness of the surrounding tissue. Also smooth chrome-phase electrode manual welding, welding over swashplate plane to be re-heat treatment, the best nitriding furnace heat treatment. Irrespective of which method to repair the swash plate, you must restore the dimensional accuracy, hardness and surface roughness.

???? 9, the valve plate and cylinder with the repair of the flow surface of valve plate plane with flow and spherical with flow in two forms. Sphere with the flow of the friction pair in the relatively shallow surface scratches cylinder with flow through the grinding means to repair; cylinder with the flow of surface grooves deeper "surface engineering" means to fill up the groove, then grinding not blindly grinding to prevent thinning of the copper layer or spill out of the steel base. Plane flow distribution in the form friction pair accuracy is relatively high platform on the ground. The cylinder and valve plate grinding before, you should measure the total thickness of size and should be grinding out the size of, then compensation to adjust the mat. Large amount of disk grinding, the grinding should be re-heat treatment, to ensure that the hardness of the hardened layer with flow. The plunger rod of the piston pump parts hardness standard recommended hardware hs84 plunger rod ball recommended hardness.

???? 10, the length of the piston pump service life, and the usual maintenance, hydraulic oil quantity and quality of oil cleanliness. Avoid the particles in the oil caused by the piston friction pair wear, but also extend the life of piston pump. Make full use of the original production of parts in the maintenance of replacement parts, these parts are sometimes more expensive than the price of other counterfeit parts, but the quality and stability is better, if the purchase price of a cheap imitation parts, seems to be short-term cost savings. but the resulting out to bring the risks, the use of piston pump may also cause more damage. Introduction: engineering hydraulic cylinder ? Aluminum alloy fuel tank http://www.ktchyd.cn

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