The Performance Analysis And Parameter Calculation Of Gas Send Type Concrete Spiral Wet-spray Machine

Gas send type concrete spiral wet-spray machine is a modern concrete spraying support equipment. It serves compressed air as power sources, transferred concrete mix to the sprayed face in transporting pipe as the "rarefied flow floating" mode, and finish jet supporting operation. However, in pneumatic conveying related theory, Transport process of concrete is regarded as the gas, solid and liquid three-phase movement. It is difficult to analyze and research the conveying process of concrete. In order to improve gas send type concrete spiral wet-spray machine injection performance, optimize injection parameters structure parameters, and conveying parameters, liquid phase in the conveying process of concrete is ignored in the text based on the related theoretical knowledge of pneumatic conveying. Transport process of concrete is regard as the gas and solid two phase movement. With the help of computer technology, gas send type concrete spiral wet-spray machine is analyzed, researched, improved and optimized in the following several aspects:(1) According to feeding characteristics of the spiral feed mechanism, which is analyzed and researched, the improvement of spiral feed mechanism is Put forward to. In order to improve the spiral feed mechanism work performance, increase its axial transporting ability, screw stem should be manufactured in the variable pitch way; In order to reduce the relative sliding speed between concrete material and flight spiral and the power loss in the transport process, straight mother linear spiral is changed to bending mother linear spiral.(2) With pneumatic conveying related theory, concrete material is regard as a special "flow" and force and motion of concrete is analyzed. Equation of motion of concrete is established in pneumatic conveying. According to movement differential equation, the actual motion process of concrete is analyzed in transporting pipe. The influence of conveying parameters on the transmission performance of concrete is discussed.(3) State of motion of concrete materials in transporting pipe is simulated by fluid dynamic mechanics software Fluent. According to the pressure, the velocity distribution characteristics of flow field and actual trajectory of concrete materials group, conveying way of concrete materials with "rarefied flow floating" mode is given in the transporting pipe.(4) The influence of angle between into wind mouth of cyclone accelerator and the axis on concrete conveying performance is explored. In different transmission requirements, how to determine angle between into wind mouth of cyclone accelerator and the axis is analyzed. (5) Establish concrete of the injection characteristics analysis model and determine regularity of speed, jet wallop distribution. The influence of injection parameters on the quality of sprayed concrete is analyzed in the concrete spray craft. To meet the quality of sprayed concrete, optimized configuration of various injection parameters is determined.This article mainly analyzes and researches the gas send type concrete screw wet-spray machine in conveying principle, injection process, injection quality and main structure several aspects such as, and concludes related research results of improving its conveying performance, injection performance and "rarefied flow floating" transportation of concrete material group. Important theoretical basis are provided for such wet-spray machine of performance analysis, reasonable design, structure optimization, which is valuable to engineering application.