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Mechanical Hydraulic Paver The Use Of Performance

AKW GROUP | Updated: Oct 27, 2017

Construction machinery due to the use of harsh environment, Mechanical Hydraulic Paver poor working conditions, often failure. According to statistics, engineering machinery hydraulic system failure in more than 75% is caused by the hydraulic oil. Hydraulic oil is used or contaminated, ranging from the use of hydraulic components and systems performance, reduce the life of hydraulic components; heavy lead to failure of hydraulic components, hydraulic system can not work properly. Therefore, the hydraulic system in the hydraulic oil once the pollution or over the use of the deadline, it must take decisive measures to immediately replace the new hydraulic oil.

We said that the oil change does not mean that some of the hydraulic oil, but a comprehensive, to maximize the old hydraulic oil out, Mechanical Hydraulic Paver oil exchange at least 90% or more, Mechanical Hydraulic Paver according to our experience, is to load Machine, for example, the specific introduction of engineering machinery hydraulic system hydraulic oil replacement method.

Construction machinery hydraulic system hydraulic oil replacement First of all,  usually the reciprocating cylinder pre-set in a variety of movements within the full stretch of the limit position, and then the oil change procedures.

Pressure element selection and parameter setting design First of all, according to the size of the load, select the appropriate system operating pressure and motor displacement, you can choose high-speed motor plus wheel reducer (speed range, low price). Mechanical Hydraulic Paver If a single motor is difficult to meet the driving force requirements, you can choose multiple sets of motors in parallel drive, in the 100t flatbed truck, we used eight displacement of 28.1cm3 / r high-speed motor (plus the speed ratio of 38.6: 1 Side reducer) in parallel. Next, the displacement of the main pump 3 is selected according to the vehicle speed requirement. Can also use multi-pump parallel fuel supply program. In this case, we are using two pumps in parallel with the oil. The displacement of the charge pump 4 can be selected from 10% to 30% of the displacement of the main pump 3, and its main role is to compensate for the leakage of the main circuit (between the variable pump and the changing motor). Choosing an excess charge pump or an excessively high charge pressure will cause the oil temperature to rise. In this case, the charge pump displacement is 20cm3 / r. The function of the flushing valve 15 is to overflow the excess oil from the main circuit and to renew the purpose of circulating the oil medium in the main circuit. General walking machinery In order to reduce the weight or by the space position limit, the hydraulic tank volume is small, usually need to return to the road plus radiator. There are five pressure regulators (three relief valves and two sequential valves) in the pump unit, Mechanical Hydraulic Paver the valve 5 is designed with the fill pressure, and the valve 7 sets the main circuit operating pressure. Valve 6 is the main circuit unloading valve, when overloaded, Mechanical Hydraulic Paver can quickly open, so that the main pump displacement back to zero, play a rapid unloading effect, the temple pressure than the valve 7 high 0.5-1MPa. The function of the valve 10 and the valve 11 is the same as that of the valve 6 and the valve 7, respectively. In order to ensure that the flushing valve can be normal tea, the overflow pressure than the valve 5 valve 0.2-0.5MPa. In this example, the relief valve pressure of the temple valve 5 is 2.4 MPa. Valve 6 = 10 is 32.5MPa.

In the closed loop due to the absence of throttling losses, Mechanical Hydraulic Paver the main reason for the system temperature rise is high pressure overflow and leakage. Therefore, the cooling power of the cooler is calculated according to the charge power consumption. This example uses a 2kW air-cooled cooler.