1. Conduct regular testing and diagnosis of Rexroth piston pumps
According to the collected fault signal, draw the online working performance curve of Rexroth piston pump and make an evaluation report. Based on the results of the monitoring, it is decided whether to repair the Rexroth piston pump. In this way, the optimal maintenance period of Rexroth piston pumps is determined, which avoids excessive maintenance in preventive maintenance and greatly reduces costs. Increasing the soft life of Rexroth piston pumps reduces downtime costs. Replace the previous regular maintenance system with a technical condition monitoring maintenance system. It also replaces the old method of manual patrol inspection of the temperature and vibration of the Rexroth piston pump casing by hand model, and whether the noise emitted when the Seroth piston pump rotates is larger than before. In particular, the technical maintenance is based on personal experience of equipment spot inspection, rather than the maintenance based on advanced testing and scientific standards
2. The monitoring and diagnosis device is a means of fault diagnosis
Fault diagnosis methods can be divided into two categories: portable simple diagnosis and online precision diagnosis. The main parameters of the failure of the hydraulic Seroth piston pump are pressure decrease, flow rate decrease, temperature rise, variable speed timeout, noise rise and vibration increase, and leakage in Rexroth piston pump exceeds the standard. When testing different parameters, different measurement methods, tools and instruments should be selected according to the actual situation reflected by the hydraulic Serox piston pump, the difference in site conditions and accuracy requirements.
The principle of Rexroth piston pump fault diagnostics is detected by vibration diagnostics, analyzed and processed by microcomputer and fault prediction is made. It can be detected directly from the outside of Rexroth piston pumps very quickly.
The internal wear of the Rexroth piston pump effectively prevents the failure of the Rexroth piston pump and improves the reliability of the main engine.
Rexroth piston pump testing can also use a hydraulic tester to test the total efficiency of Rexroth piston pumps. The hydraulic tester is composed of flow, pressure gauge and thermometer, which can be connected to the discharge port of Rexroth piston pump, and the flow rate of Rexroth piston pump outlet at all levels of pressure is detected by adjusting the various functions of the instrument, and the total efficiency curve of Rexroth piston pump is drawn. When the total efficiency of Rexroth's piston pump dropped to 72%, it had to be repaired offline.
The tester is connected to the drain port of the Rexroth piston pump to detect the internal leakage of the Rexroth piston pump. The leakage of Rexroth piston pump is changed with the online use time, in a fixed cycle time, the change of the leakage can be measured to know the change of the operating state of the Rexroth piston pump affecting the normal operation of the system, the curve of the leakage with time is called the state curve, as the evaluation index of the working state of the Rexroth piston pump, which can be used for fault prediction and the determination of the maintenance period.
Drawing and analysis of leakage curves in Rexroth piston pumps. The leakage curve of Rexroth piston pump is drawn with the running time of Rexroth piston pump as the horizontal coordinates, and the internal leakage volume and volumetric efficiency as the longitudinal coordinates, and the leakage exceeds 50% of the normal value and must be repaired off the production line.
3. Check the current value of Rexroth piston pump
The large hydraulic station in the metallurgical industry is composed of a hydraulic system composed of a plurality of Rexroth piston pumps and is equipped with a large accumulator group, if there is a Rexroth piston pump inner pool leakage or can not reach the working pressure, the pressure and flow hazards of the entire hydraulic system can not be immediately revealed, the inspection personnel must check the current value on the ammeter on the working Rexroth piston pump every day and make a record. If the working pressure of one Rexroth piston pump in one of the Rexroth piston pump groups is lower than that of the other Rexroth piston pump, the Rexroth piston pump with low pressure will show a lower current value on the ammeter than the normal Rexroth piston pump, that is, the Rexroth piston pump with less work requires a lower current than the Rexroth piston pump with normal work.
4. Measure the temperature of Rexroth's plunger pump casing
The large leakage in the hydraulic pressure Sinoloth plunger pump, the increase of the deep temperature sub-gap in the Rexroth plunger pump causes the pressure oil to leak, and the leakage of pressure oil is converted into heat energy, which will inevitably cause the temperature difference between the Rexroth plunger pump casing and the normal Rexroth plunger pump casing. If the bearing in the Rexroth plunger pump is fatigued, the bearing is heated and accompanied by noise, the heat is shown on the surface of the Rexroth plunger pump casing, and the above two heating phenomena are detected and compared with the "infrared electronic thermometer", and the surface temperature of the problematic Rexroth plunger pump casing will be higher than the normal working hydraulic force Seroth plunger pump casing. The inspector should use the "electronic thermometer" to detect the temperature of the outside of the main shaft of the Rexroth piston pump, the middle of the Rexroth piston pump shell, and the back cover of the Rexroth piston pump every hour, and mark the temperature record on the temperature rise curve table of the Rexroth piston pump, which can be provided to the technicians at the same time as the Rexroth piston pump monitoring and diagnosis data sheet, so that the technicians can make correct judgments on the Rexroth piston pump.
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