No. 6007, zhenpu road, xiepu town, zhenhai district, Ningbo
The design of power unit is an important link that cannot be ignored. Do you know the specific design process?In practical application, hydraulic system pollution, leakage, impact, vibration and noise problems, these are the design and use of general power units need to pay attention to several key issues.At the same time these key parameters for the use and operation of the entire hydraulic system will play a great impact.
What factors should we pay attention to?First, we need to complete the hydraulic and power system calculation, and to determine the engine model and specifications.Then, according to the calculation results of the hydraulic system and referring to the existing engine products in the product library of various engine manufacturers, select the engine products that meet the demand of power unit size, especially the demand of height.
In the process of power unit operation, if there are more pollutants in the oil, the slide valve jam fault will occur between the gaps of the slide valve, which will lead to the damping or throttling holes in the hydraulic components blocking the failure of components and other problems.In fact, about half of the fault problems in hydraulic systems are caused by contamination of hydraulic oil.Therefore, the control of hydraulic oil is very important during production.
In addition to precautions taken to prevent contamination, leakage must be avoided as much as possible.If for some reason the oil exceeds the boundary and flows out of the other tank or system where it should not, it is called a leak.If leakage occurs, it will certainly affect the action of the power unit.The internal leakage is a leakage from the high-pressure cavity of the element to the low-pressure cavity, while the external leakage is a leakage from the middle flow of the element or pipe to the outside.
At the same time in the process of hydraulic station system work, generally there will be different degrees of impact.This is because during the action of the power unit, there is for some reason a sharp alternating rise and fall in pressure. This damped fluctuation process is called hydraulic impact.Hydraulic impact makes the instantaneous pressure of the system many times larger than the normal pressure. This phenomenon often causes damage and failure of hydraulic components, pipelines and sealing devices, causing system vibration and noise.
The following is to consider the actual situation, reasonable design of the power unit installation rack and the layout of each component.Generally, according to the structural characteristics of the mounting frame and the engine, the installation of the engine adopts the suspension type, the engine is supported at three points, one of which is supported at the fan end, the other two points are supported by two legs of the transmission box, and the transmission box is connected with the engine flywheel shell.The hydraulic oil pump is connected to the engine flywheel through the coupling of the transfer case for the engine power output.
Finally, the whole system should be controlled to avoid abnormal vibration or noise.In fact, these two situations are more common, and in the lifting machine during the action of the hydraulic power unit, in which vibration is the inherent characteristics of elastic objects, noise from the vibration, the vibration of the noise is called sound source, so the noise control attributed to the control of vibration.
After finishing the layout of each part, it is necessary to make appropriate adjustments and optimize the structural strength of the mounting rack.Such as through each component in the power unit in the mounting bracket arrangement in 3 d modeling, to have a mutual interference between the parts, influence use, not easy to maintain parts position adjustment, especially for the engine cooling system through the adjustment and test of each component can play to their respective functions in the mounting bracket.
Normally, after the components are fixed, and then combined with the force of the whole and the parts of force and the vibration of the power unit, the finite element analysis was carried out on the mounting bracket, for some of the stress concentration location is optimized and reinforcement, thus ensuring the intensity of the use of the power unit.
Address：No. 6007, zhenpu road, xiepu town, zhenhai district, Ningbo