Hydraulic pump maintenance is not just about replacing parts!
Judging from the development history of the hydraulic industry for more than 150 years, modern hydraulic technology is in its most glorious period. Products that combine modern electronic technology with hydraulic technology are ubiquitous in various fields, ranging from From aerospace to robotics, there is no field that does not use hydraulic technology. The most perfect representative of contemporary technological products that combines electronic technology and hydraulic technology is the paver.
However, the technologies of modern paver machines are not perfect, and there are still many areas that need to be improved step by step. For example, the hydraulic piston pump still has ten technical defects that cannot be overcome by modern technology and need to be further developed in the future. to solve. One of the ten technical flaws is that modern hydraulic piston pumps have low operating pressure. Scientists' ideal "pump" and "motor" operating pressure should reach 60Mpa. The speed reaches more than 6,000 rpm. If the above state can be achieved, the paver designed by scientists is: an engine drives a generator, the generator drives a DC servo variable frequency motor, and a DC servo variable frequency motor drives a small " Fixed displacement plunger pump". When the paver needs to move quickly, the servo variable frequency motor reaches a high speed, and the output oil displacement of the metering pump is also large. When the paver needs to be used slowly, the servo variable frequency motor reaches a low speed, and the output oil displacement of the metering pump becomes smaller. , In this way, the variable part of the pump is omitted, the volume of the pump is greatly reduced, and the fault points are also significantly reduced. Any construction machinery in the world pales in comparison to an excavator. If a person can understand the various technologies of the paver, it will be no problem to repair any construction machinery. Those construction machinery are just technical replicas of the paver.
Before repairing the pump, you must first determine which part of the pump needs to be repaired and determine what conditions the pump has.
(1) How long is the total service life of the pump? A pump cannot be used for a long time. If it exceeds ten years, the pump will basically have no maintenance value. Because steel also has a certain periodicity, the steel base will produce a separation layer and deformation of the pump casing.
(2) How long has it been since the pump was last repaired? Which parts were replaced last time the pump was repaired? The maintenance level of the person who last serviced the pump?
(3) What is the operating pressure of the current pump? The variable mechanism of the pump adjusts the sensitivity and (response) feedback speed? What is the operating temperature of the pump?
(4) What kind of noise does the pump make? Identify whether the noise is caused by machinery or hydraulic noise?
(5) What type of hydraulic oil is used? What is the current level of oil quality? Drain all the hydraulic oil from the hydraulic tank of the paver and check the oil quality? Check how many impurities there are in the bottom plate of the fuel tank? What kind of impurities are they? If the quality of the hydraulic oil deteriorates, the machine owner must be asked to replace the hydraulic oil.