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Piston pump is through a fixed seal member, a piston moves back and forth. By reciprocating movement of the piston pump so that the pump chamber volume work cycle changes, complete suction and discharge liquid. The piston seal is mounted on the plunger, through a lubricated cylinder wall. It is mainly the use of the plunger reciprocates in the pump cylinder, the plunger and the pump wall forming volume changes, repeating suction and discharge of liquid and increase its pressure pumps. Piston pumps usually have a very good pre-use features, the advantage of having a rated pressure, compact structure, high efficiency and flow conditioning facilitation, but its drawback is not running excessive pressure, the use of life expectancy is shorter.
????Most likely cause of the malfunction equipment is usually not due to the onset of the pump, the pump is usually caused by problems of wear member or members, such as nozzle wear caused by the sealing member. Generally, the lack of water into the pump, is one of the main reasons leading to the early onset of pump failure during use, usually it is due to the water inlet pipe diameter is too small or lack, so that there is not enough water then enters the pump internal, so the appearance of the pump caused by cavitation, the cavitation so that the mixing of water in the gas attack small blast overpressure damage, so that the piston outer wear.
????The reason why high-pressure water jet equipment weak momentum, are due to piston can imagine, is how important the piston.
?Precautions new hydraulic excavator Replace after
????(1) at any time pay attention to anomalies found
Abnormal sound, vibration or abnormal signal monitoring systems, etc., must have their reasons, one found there are anomalies, immediately got circuit diagram, what you want, be careful survey anomalies are formed not for temporary fault. Evaluation or need to stop treatment. Jufan pressure, load, temperature, time, start-up, when the suspension contains the cause of the anomaly may have occurred. That should be itemized analysis usual discussion.
(2) Do not start immediately after the hydraulic pump is applied to the load
Pump shall be implemented in a period of time after the engine idling with no load (about 10 minutes to 30 minutes), especially when the temperature is low, the process is more subject to temperature vehicles, the hydraulic circuit coupled to the load normal cycle, and to acknowledge the work situation.
(3) to investigate the oil change
Check carefully the maximum and minimum oil temperature change the situation and find out the text ambient temperature oil contact, so the ability to know the cooler capacity, storage tank capacity is not with the surrounding conditions, the use of co-ordination conditions, the cooling system can eliminate problems before tracked.
(4) pay attention to the hydraulic pump noise
The new pre-pump wear less vulnerable to the impact of bubbles and dust, smooth bad condition or use of the high temperature overload, etc., can lead to adverse consequences, so that the pump does not normally announce impact.
(5) Check carefully to show the value of Keiki class
Ready to investigate the apparent value of the hydraulic circuit pressure gauges, pressure switches and other oscillation signal sight and stability, the role of early detection of the hydraulic circuit is not normal.
(6) pay attention to investigate the case of a mechanical action (on the modified pump)
Inappropriate or poor planning of the hydraulic circuit components manufacturing, during the initial application is not easy to find, it should use special care in a variety of conditions showing the action situation.
(7) carefully adjust the valves within
Fully aware of the pressure control valves, flow control valves and directional control valves use, and limit the size of the adjustment required special care, or adjust the fault not only mechanical damage and more of a security threat.
(8) See filter case
Of the loop filter should be removed and cleaned regularly, and see the situation and dirt filter medium adsorbed, analyze quality, quantity and size, so the loop can investigate contamination, even infer the source of contamination sites.
(9) See the timing of hydraulic oil change
Every one or two months view analysis of hydraulic oil deterioration, discoloration and contamination degree of change, in order to ensure the normal hydraulic transmission medium.
(10) the situation carefully leaked pipe part
Hydraulic equipment piping nondefective, can be seen at work for some time, the prosecution is not a leak, the pipe is not loose.
Attention should be paid within three months of work (11) The new machine work
During the period the new machine work, the work should grasp the view, such as maintenance parts, screws are not loose, oil is not there does not rise to normal hydraulic oil is not quickly deteriorate to view the condition of use is not consistent with the provisions Wait.
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