Study On The Concrete Mixing Device For Mine

Since the stand-alone operation and poor compatibility, it is difficult for the coal shotcrete support to be mechanized. This condition has a severe influence on the quality of the shotcrete support and the tunnel excavation. Accordingly, designing a concrete spraying equipment group which combines all the functions together including reclaiming, feeding, mixing and spraying has a profound and far reaching significance. As a important part of the equipment group, the concrete mixer connects the reclaimer and concrete spraying machine effectively, its main function is to complete concrete mixing with high quality and feed spraying machine effectively. Considering the special environment of the coal mine and the compatibility between devices, this paper designs a compulsory concrete mixer with single horizontal shaft, which has a compact structure and sets feeding, mixing and outfeed functions in the integration.Firstly, the paper completes the overall design of the mining concrete mixer under the consideration of the system functional requirements; Secondly, the main parameters of the mixing host are selected; Lastly, launch the static strength analysis of the mixing mechanism at different stress conditions using finite element analysis software ANSYS, the results show that the mixing mechanism meets the requirements of statics.According to the mining tunnel space size requirements, the paper determines the main parameters of the mixer in the luffing mechanisms firstly, establishs the minimized mathematical optimization model of the luffing force amplitude fluctuations through analysing the factors which affect the working performace of the luffing mechanism, obtains the optimized location parameters in hinge points lastly by using MATLAB software. The kinematics simulation of the mixer and dynamic simulation of the luffing force are launched by using the software ADAMS. The results show that the concrete mixer achieves a success on feeding and outfeeding. On the otherhand, it indicates that the feeding mechanism could satisfy the basic feeding function, and luffing force is optimized, all those verify the reasonableness of the optimization furtherly.Reasonable ranges of the mixing speed and the blade angle parameters are obtained by implementing theoretical analysis of the main parameters which affect the mixer performance. Mixing inefficient zone is eliminated through adding a group of small mixing blades which the compulsory mixer has inherently, then the simulation of the flow field is carried out by setting comparative experiments using FLUENT software. Results show that the adding of the small mixing blade is useful to the elimination of the mixing inefficient zone phenomenon.The industrial experiments of the mining concrete mixer are conducted in coal mine, it shows that the mixer achieves a success on feeding and outfeed, and the mixer achieves a good match with other devices in operation. By conducting the mixing performance experiment, the result shows that the concrete mixer has a perfect mixing performance, the concrete meets requirements of the concrete spraying finally.