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Recent contact with a hydraulic Excavator The hydraulic system uses constant power variable Piston In order to ensure the box. However, measurement of the hydraulic pump inlet pressure, the pressure was found with Working device Movement and change periodically, and the fluctuation range, the minimum is 0? 075MPa (vacuum of 0.025MPa) up to 0? 2MPa. The working device is not a sport, the pressure is stable around about 0.14MPa. We know Pump Inlet pressure is too low (that is, through a large vacuum) will reduce the pump efficiency, and prone to cavitation phenomena, the flow of oil deterioration, component surface by the partial erosion of fatigue or damage, increased noise and vibration. Therefore, the oil pump inlet pressure not too low, normal piston pump inlet pressure should be not less than. 085MP. ; While absorbing excessive population pressure, the pressure inside the tank that is large, this will cause hydraulic pump and Motor Shell pressure inside the drain, it will seriously affect the hydraulic pump and hydraulic motor to work, or even puncture the seal will not work. Piston and Piston Motor shell live not more than drain pressure. 15MPa. Therefore, the pump inlet pressure is too high or too low will affect the speed of the hydraulic system to work, to the extent Hydraulic Components Destroyed, would have to identify the reasons for and remove. Analysis 1 Machine Hydraulic oil Box of inflatable pressure 0? 15MPa, which is achieved by a pneumatic system, the gas is Engine On Air Compressor Provided, after saving cylinders, Valve And Pipeline For conveying to the fuel tank to fuel tank pressure, improve the pump inlet pressure. Working device is a double acting single Piston rod Driven hydraulic cylinder, two cylinder working chamber because there is an area of poor (poor area of the rod cavity is always smaller than that without rod cavity area), when the cylinder movement, into two cavities, the oil of flow, there exists a difference. If the fuel tank of a large cavity into the oil (ie oil supply pump to the large cavity), then a small cavity on the flow back out of the oil tank, as the NPC into the cavity of the oil out of oil more than a small cavity, it pumps from the tank suck out the oil flow rate is greater than a small cavity flow cylinder oil flow back to the tank, then the fuel tank will reduce the oil surface will drop, oil face? the pressure becomes smaller, gas system began to inside the gas tank, in order to maintain constant pressure. If the tank is greater than the flow of oil to reduce gas flow into the tank, it will reduce pressure inside the tank, and the difference the greater the pressure will be lower, resulting in pump inlet pressure is too low. When the fuel tank into a small cavity oil (ie oil supply pump to a small chamber), then the flow of oil to a large chamber into the tank, as a small cavity into the large cavity outflow of oil flow is less than the flow So pump the oil from the tank suction flow is less than a large cavity flow cylinder oil flow back to the tank, then the fuel tank will increase the oil surface rises, the gas is compressed air pressure tank larger, Safety valve Open the gas tank drained to keep the pressure constant. If the flow of exhaust gas within the oil tank is less than the increase in traffic, increased pressure will cause the fuel tank, resulting in pump inlet pressure. To Stick to run, for example, by the calculations indicate that the bucket cylinder rod movement, into or out of the flow of oil tanks difference between the two cavities (the fuel tank to increase or decrease the flow of oil) are larger, about To 170L/min, only into or out of the tank of gas flow rate of the value, to ensure constant pressure within the tank. As bullied source restrictions, and pressure pipe length, bending over and the diameters of small, resulting in large air resistance, leading to inadequate air flow rate (up to less than 170Umin) the main reason. When the work unit is not a sport, that tank do not exercise, then the oil pump discharge flow back into the tank directly, that is, pump out the oil from the tank suction flow of traffic and flow back into the tank of oil equivalent, so the oil. Box of the oil change, oil height also remains unchanged, pressure stability, so that pump inlet pressure remains unchanged. In addition, the pump suction pipe is too long and bend over so that oil absorption resistance increases, it is the low pressure pump suction port one of the reasons. 2 solutions The e-commerce company in China offers quality products such as Pcc e Cigarette Manufacturer , China Ego E-cigs, and more. For more , please visit Pcc Electronic Cigarette today!
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