Maintenance and damage analysis of hydraulic pump and plunger pump
Published Time:2016-12-17
Hydraulic pump plunger pump in use after a certain period of time, will gradually wear and damage to the parts, resulting in reduced pump movement accuracy and performance, will not hit the oil pressure, fuel supply reduction, noise increasing, vibration increase and other abnormal phenomenon. These phenomena are often concentrated pressure pump parts wear or damage symptoms.
In the daily use of the hydraulic pump, if people have to install, remove oil pump operation, fault, Tanzania and how to preserve and maintain the knowledge, you can greatly delay the hydraulic pump parts wear or avoid damage.
Once the hydraulic pump parts wear and exceed the allowable deviation, must be timely repair, recovery (or replacement), so that the hydraulic pump to regain the proper accuracy and performance. In some cases, skilled operators, through excellent repair and assembly skills, and even improve the performance of the hydraulic pump.
Reasons for damage of hydraulic pump
Hydraulic pump damage for a variety of reasons, but its essence, mainly in the following two.
(1) wear and tear
The wear of hydraulic pump parts is the inevitable result of mechanical operation. Under normal operating conditions (i.e. compliance with pump operating procedures and maintenance regulations), gradual wear due to friction and chemical reactions, etc., is a natural abrasion. This wear is unable to eliminate and avoid, but through careful maintenance and proper use of the pump, can slow down the wear rate, extend the wear cycle.
Wear causes and phenomena are mainly the following:
1 friction and wear
The surface manufacturing parts after carefully with a magnifying glass, always rugged, after hydraulic pump operation after abrasion, the metal particles from the surface of parts, parts of the surface of rugged places relatively smooth, and then continue to friction, small grinding will have a deep impression or size, this is the normal wear of friction and wear the nature of the. Abrasive wear.
2 abrasive wear
The parts with the surface there are solid particles of pollutants, according to the analysis of the hydraulic pump oil pollutants, the pollution of particles is more than 20% of silica and metal oxides, these few wear is the most serious wear components of pump parts, the surface of them between pairs of parts, while on the move, the equivalent of the grinding effect of abrasive wear, produced intense.
3 crater wear
This is a hydraulic component for fatigue damage. Under the alternating load, due to periodic compression and deformation, residual stress and fatigue phenomenon, the micro crack in the parts that caused a small, slowly peeling, small stone surface.
4 corrosive wear
The surface of hydraulic pump elements is subjected to the erosion of acid, water and other corrosive substances in oil, and the gradual damage of metal surface.
These wear wear particles, continue to fall between the two moving parts, will aggravate the shallow wear. According to the test results, the maximum wear of swash plate pump piston pump occurs in 5~10 m solid particle abrasive wear two of the oil pump caused by a significant decline in the amount of oil is due to abrasive wear of 40~60 solid particles. The reason is that the latter on the sliding surface of uneven wear, especially with oil baffle and cylinder. Hugh column. The local partition between the plug row inferior, although the friction is little, but the oil hydraulic pump F was significantly decreased. Although the former is the maximum amount of wear, but the wear uniform, still can make the sliding surface if the oil surface to keep the little gap, so the small amount of leakage. Wear particles are arrogant and small vicious wear, therefore, the size of the particle wear image must also pay attention to, and to reduce and improve.
(two) accident
Violation of the pump operation procedures and maintenance requirements, causing serious overload, overspeed, and pump parts has been advised and loose off, still forced to start, or after overhaul of heavy equipment, hydraulic pump parts tools and other objects fall into the pump and causes the secondary damage phenomenon.