Research Of Pressure Loss Characteristics And Optimal Design Of Hydraulic Manifold Block Channel In Pumping System In Concrete Pump

Abstract:Concrete pump is a kind of construction machinery which can pump concrete with high efficiency and high quality. In achieving the energy or pressure transportation, the main valve block and pressure switching valve block of the pumping system are the key hydraulic components of which the proper channel structure design directly concerns the pressure loss and energy efficiency of the pumping system. To address the problem of the severe pressure loss of the main valve block and pressure switching valve block of the pumping system, through analysis of the hydraulic pipe flow of typical channels and research on the mechanism of pressure loss, the influence of channel structure parameters on pressure loss was analyzed and the channel was optimized and improved based on the uniform design method. The main contents are as follows:1. The structural features of channel of the main valve block and pressure switching valve block was introduced; the damage caused by too much channel pressure loss was analyzed; with the current situation of research on the channel pressure loss from home and abroad, the research method of lowering the pressure loss of valve was proposed.2. Based on the basic theory of fluid mechanics, the classification of pressure loss of channels in hydraulic manifold block and the causes of local pressure loss were studied, and the methods of reducing local pressure loss were discussed.3. Through flow field simulation of the typical Z-type channel,∏-type channel and90°group channel in hydraulic manifold block, the distribution and change law of channel parameters such as pressure and velocity were obtained. Thus, the impacts of such structural parameters as the direction of the nose angle, channel path ratio, nonorthogonality of channel and properties of auxiliary hole on the channel pressure loss were concluded.4. Based on the uniform design method, the function relation between the main structure parameters of channels and pressure loss was established. With the obtained best design scheme, the channels of the main valve block and pressure switching valve block were optimized and improved.5. Comparison of experiments of the main valve blocks and pressure switching valve blocks before and after optimization on the concrete pump shows that after optimization the pressure loss is reduced obviously, and the heating problem of the system is improved, which proves that the theoretical analysis and the simulation results are correct.