| The coal mining technology has rapidly developed and mining mechanized degree has increased greatly in recent years, which has greatly shortened continuous working time of the fully mechanized coal face. However, coal mine is facing an urgent and important issue that coal mining continuous rate must be improved as soon as possible. In addition, the moving time of mining equipment has to be greatly reduced. There were some problems of traditional methods, such as low efficiency, high labor intensity, high loss and high safety risks and so on. Aiming at these problems, the domestic enterprises have developed mobile hoisting equipment for underground mining coal. It can not only ensure the safety of staff and improve efficiency.Being greatly different from the ground lifting equipment, the underground lifting operation was restricted by narrow space and complex environment, which put forward higher requirements on safety and stability for mine hydraulic hoisting machine. In order to provide the basis of security trial, improve and perfect for this type of equipment, the research object in this paper is focused on a telescopic boom type mine hydraulic hoisting machine designed by a company. First of all, the crane jib mechanism was analyzed through both method of theoretical calculation and finite element analysis, finite element model and force analysis of crane jib was completed with ANSYS software. The corresponding nephogram of stress, displacement and the safety coefficient are obtained, the maximum stress was298Mpa, the safety factor was2.78that is higher than the standard safety coefficient1.5. The boom was safety and reliability, it verified the safety and reliability of the crane jib. The crane jib was an important component of luffing mechanism. Based on the equivalent element, the motion differential equations were listed and calculated by MATLAB software, the system dynamic response was obtained, and it laid a good foundation for the follow-up multi rigid body dynamics simulation of mine hydraulic hoisting machine. Compared with the traditional method, the equivalent element method was relatively simple and efficient.Aiming to the problems of large hydraulic pressure in cylinder when the hydraulic hoisting machine luffing mechanism was working, the main reasons of the problem located in the shock and vibration caused by crane jib lifting as well as the unreasonable hinge point position distribution. The mine hydraulic hoisting crane luffing mechanism model was established by ADAMS software. The drive the function of hydraulic cylinder and the maximum value of hydraulic pressure of6.4909E+005N was obtained by dynamics simulation. The lifting speed also changed in the range of0.745°/s to0.755°/s. In order to reduce fluid pressure value, the three-hinge mechanism mathematical model has been established and the design positions of three-hinge mechanism have been optimized to solve the problem mentioned above. Hydraulic cylinder force was6.0359E+005N, which was lower than the selected hydraulic cylinder. At the same time, the lifting speed changed in the range of0.747°/s to0.753°/s. It solved the large hydraulic pressure of hydraulic cylinder caused by unreasonable position of three-hinged point mechanism. It also provided a reasonable and effective theory for improvement of mine hydraulic hoisting machine. |
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