Hydraulic pump piston pump in a certain period of time, one of the parts will gradually wear and even damage, resulting in pump movement accuracy and work performance is reduced, will produce oil can not hit, reduced fuel supply, noise, vibration increases And other abnormal phenomena. These phenomena are often symptoms of pressure pump parts that are worn or damaged.
In the daily use of hydraulic pumps, people if the pump installation, oil, operating failure to exclude, and how to carry out maintenance and maintenance of knowledge, you can greatly delay the wear or avoid damage to the hydraulic pump parts.
Once the parts of the hydraulic pump are worn and exceeded the permissible deviation, they must be repaired in time, restored (or replaced), so that the hydraulic pump can regain the accuracy and performance. In some cases, skilled operators, through sophisticated repair and assembly techniques, can even improve the performance of hydraulic pumps.
Cause of damage to hydraulic pump
There are various reasons for the damage to the hydraulic pump, but the essence of the pump is as follows.
The wear of hydraulic pump parts is the result of mechanical operation, like any part of the equipment. Under normal conditions of use (ie, compliance with pump operating procedures and maintenance regulations), due to friction and chemical reactions and other factors long-term effect and gradually increase the wear and tear, are natural wear and tear. This wear can not be eliminated and avoided, but by careful maintenance and proper use of the pump, you can slow down the wear and prolong the wear cycle.
The causes and phenomena of wear are as follows:
1. friction and wear
Parts of the surface after the manufacture, carefully observed with a magnifying glass, always rugged, after the operation of the hydraulic pump wear and tear, so that the metal particles from the surface of the parts off, parts of the uneven surface of the uneven level, and then continue to friction, Will produce deep marks or size of the grinding small, this wear is normal natural friction and wear. Also known as abrasive wear.
2. abrasive wear
As the parts with the surface of the existence of solid particulate pollutants, according to the hydraulic pump oil contaminants analysis, more than 20% of its contaminated particles are silica and metal oxides, these wear and tear is the most serious parts of the pump parts wear, They are sandwiched between the surfaces of the moving parts, which, when moving, are equivalent to the effect of abrasive sand, resulting in severe abrasive wear.
3. Pits are worn
This is a hydraulic component for fatigue damage. Under the action of alternating load, due to the periodic compression and deformation, resulting in residual stress and metal fatigue phenomenon, the results in the parts on the small cracks, resulting in slowly causing parts of the surface stone small pieces, a small piece of peeling.
4. Corrosive wear
The surface of the hydraulic pump element is subjected to erosion of the corrosive substances such as acids and water in the oil, and the metal surface is gradually damaged.
The above-mentioned wear and tear of the particles, continue to fall between the two moving parts, will intensify the shallow wear. According to the experiment, it is shown that the maximum - wear amount of the swash plate type plunger pump occurs in the abrasive wear of the solid particles of 5 ~ 10μm, and the oil pump oil output is obviously decreased due to the abrasive grains of 40 ~ 60 solid particles Wear. The reason is that the latter is not uniform on the sliding surface wear, especially with the oil tray compartment and the cylinder. The pillars. Seal of the partition at the local level, despite the small amount of friction, but the hydraulic pump oil F significant decline. Although the former wear the largest amount, but even wear, can still make the sliding table and the oil surface to maintain a small gap, so the leakage is not large. Abrasive grains are arrogant and viciously worn, therefore, the size of the particles like the wear must also pay attention to, and to reduce and improve.
(B) the accident
In violation of the hydraulic pump operating rules and maintenance regulations, resulting in serious overload, super speed, and even pump parts have been advised and will fall off, still forced to start, or repaired after reloading, tools and other foreign matter fell into the pump and other reasons The resulting damage to the hydraulic pump parts.
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