Currently there is no accurate definition of the length of service life of miniature gear pumps, the national standard and the actual use of time there is a large gap, so the specific service life depends mainly on the working conditions, the general life of the length of time in a year and a half or so.
One of the factors affecting the life of hydraulic gear pumps
1, the installation of the use of
Hydraulic oil pump input journal and the motor shaft coupling, coaxiality error can not exceed 0.1mm. bear in mind that can not be connected with the belt, should be based on the pump manual, the selection of appropriate hydraulic oil, and in the pump inlet filter, according to the working conditions of the hydraulic system regularly, and the pump inlet filter, and the pump inlet filter. According to the working environment of the hydraulic system regularly filtered, replace the hydraulic oil.
2, bearing planning and selection
Hydraulic gear pumps should be considered in the use of planning its life, hydraulic gear pumps are scrapped in most cases because of bearing damage. Currently the better bearing material is SF-type composite material. This material is a steel plate as a substrate, sintered copper mesh for the intermediate layer, to plastic (filled tetrafluorohexene, modified polyformaldehyde) for the conflict surface of the smooth material section, the material has high mechanical strength, friction coefficient is small, low noise, good abrasion resistance, good corrosion resistance, good thermal conductivity, small scale, low cost, can be in the oil-free or less oil-smoothing conditions and a wide range of operating temperatures. Practice has proved that the use of SF material bearings, so that the life of the gear pump greatly improved.
3, technical reasons
In order to ensure a reasonable clearance between the front and rear end caps of the hydraulic gear pump, the processing and installation of the hydraulic gear pump is very important. The straightness difference between the two end faces of the gear and the hole axis centerline can not exceed 0.01mm, and after mounting on the shaft, its axial direction should be in the floating condition. In order to ensure that the installation of the two shafts in the correct position, in the processing of the front and rear of the two bearing holes, the middle distance difference should not exceed 0.03mm. In addition, the input shaft end cracking is also a common phenomenon, it is necessary to master the shaft heat treatment technology, which can make it have a certain strength and hardness, but also has a high impact resistance, to avoid its cracking.
4, materials, components, reasonable selection
In order to ensure that the hydraulic gear pump operation with a reasonable clearance, the wear resistance of the material is an important performance indicators. Selection of reasonable materials and appropriate heat treatment technology is important. Oil seal leakage is also a common cause of failure. To choose good raw material oil seals, together with the processing and installation of oil seals and bushings to pay attention to the cooperation to be strong, the oil seal bore and the pump shaft should have enough tension, can not leak oil.
5, end face clearance problems
Hydraulic gear pumps are often used in the application of volumetric efficiency reduction, pressure reduction and scrap. Gear end face leakage accounted for 75% to 80% of the total leakage. Therefore, a reasonable end face clearance is critical.
Two, how to make the gear pump life longer
1, for the self-priming oil gear pumps, hydraulic oil tank oil shall not be lower than the lower limit of the oil standard, to maintain a sufficient amount of hydraulic oil. The higher the cleanliness of the hydraulic oil, the longer the service life of the hydraulic pump.
2, the role of a period of time, the plane will appear in the concave phenomenon, in the use of platform grinding before, should first measure the original size and plane hardness. After grinding, and then measure the amount of grinding is how much, such as within 0.18, the use of the cooler is not prevented; if more than 0.2mm, should be used to maintain the original nitriding method of nitriding the thickness of the layer.
3, plane by the gear ball scraping out grooves, can be used to repair the laser melting alloy powder method. No matter which method to repair, must restore the original dimensional accuracy, hardness and surface roughness.
4, the spherical flow of the friction vice, in the cylinder body flow surface scratches are relatively shallow, through the grinding means of repair; cylinder body flow surface grooves deeper, should be used first "surface engineering technology" means to fill the groove, and then grinding, do not blindly grinding, in order to prevent the copper layer becomes thin or leakage of oil out of the steel base. Plane with the form of friction in the form of flow can be in a relatively high platform for grinding.
5, with bearings hydraulic gear pumps the most important parts are bearings, if the bearing clearance, can not guarantee the hydraulic pump internal three pairs of friction vice normal clearance, but also will destroy the friction vice static hydraulic support oil film thickness, gear pump efficiency is reduced, but also affect the operation of the hydraulic system. If you find the roller surface with scratches or discoloration, it must be replaced.
6, three pairs of friction vice inspection and repair: gear rods and cylinder holes according to the replacement of gear pump parts standard, when the parts of the various gaps in excess, can be repaired in the following way: cylinder mounted copper bushings can be used to replace the copper bushings repair method. First of all, a group of gear rods at the diameter trimmed to a uniform size, and then use more than 1000 # of sandpaper to polish the outer diameter.
Expanding knowledge
Knowledge point one,Micro Gear Oil Pump Advantages
1, the motor life is long: sealing stronger, the details of the quality of the show, the life of a long and efficient;
2, the whole Copper wire coil: cold rolled silicon steel 800 #, low temperature rise, high efficiency power enough, long service life;
3, stainless steel joint shaft: processing and molding operation is smooth, the surface of the moisture-proof, rust-proof treatment;
4, ball bearings: large load bearings, simple structure, easy to use, dustproof performance;
5, custom alloy seal: 304 stainless steel spring, high strength, sealing small, low resistance;
5, custom alloy seal: 304 stainless steel spring, high strength, low resistance. High, small seal, low resistance, sandproof;
6, high-quality gear: high-temperature quenching to improve alloy hardness strength, durable.
Knowledge point two,Screw pumps are mainly used in what occasions
1, screw pumps because of its variable conveying, self-priming ability, can be reversed, and can be transported solid particles of liquids and so on, in the wastewater treatment plant, the screw pumps are widely used to transport water, wet sludge and flocculant liquid.
2, screw pumps due to the structure and working characteristics, can transport high solid content of the media, flow uniformity, pressure stability, low speed is more obvious, due to good variable adjustability, and thus can be a pump for multiple purposes, transporting different viscosity of the media.
3, the installation position of the screw pump can be tilted arbitrarily, suitable for conveying sensitive goods and goods susceptible to damage by centrifugal force and so on.
Knowledge point three,Screw pump working characteristics
Screw pumps mainly have the following characteristics: simple structure, the use of safe and reliable, easy to use and maintain, the liquid continues to be an average, stable pressure, murmur and vibration of the small, with the ability of self-absorption, but the processing of the screw is more troublesome.
Knowledge point four,What is the three screw pump
Screw pump is a rotary displacement pump, according to the number of screws, can be divided into single-screw, twin-screw, triple-screw and multi-screw pumps, the three-screw pumps, that is, the three screw pump. Three screw pump, is a three screw screw pump, including an inserted in the pump cylinder in the active screw and its engagement of the two slave screw, the three mutually meshing screw, in the pump cylinder according to each lead to form a sealing cavity, resulting in the suction and discharge between the mouth of the seal.
Knowledge point five,peristaltic pump uses what
Peristaltic pumps of any of the use of the scene is to deal with fluid (can be any liquid with fluidity, can also be a mixture of solid-liquid), peristaltic pumps is the main role of the transfer. Peristaltic pump conveying accuracy can reach up to ± 0.5%, so it can meet the needs of quantitative conveying, but also can meet the needs of quantitative distribution.
From the level of product function, the use of peristaltic pumps is mainly: quantitative or metered delivery, quantitative or metered distribution. So where there is quantitative conveying and distribution needs of application scenarios, can choose peristaltic pump to meet the application requirements.
Peristaltic pumps have excellent performance and reliability, so the application is very broad, to meet the application of various processes, including from experimental scientific research, analytical instruments to industrial production in many fields, so the peristaltic pump is very useful, the use of a very wide range of areas:
1, analytical instruments: chromatography, atomic fluorescence photometer.
2, the medical industry: medical equipment and diagnostic reagents instruments.
3, biopharmaceutical: coating machine, granulation and pill-making machine, fermentation tanks, for purification, fluid transportation, distribution filling, high-precision liquid dispensing.
4, experimental research: laboratory and research equipment.
5, food and beverage: ready-to-mix beverage machine, yogurt machine, self-service vending machine, intelligent milk tea machine, seasoning distribution adding, beer industry.