Research On Improving The Efficient And Safe And Stable Operation Of The Economy Friction Hoist

Mine hoist plays an important role in mine production,Linked to the key hub of mine work and downhole operations,responsible for the excavation equipment,operating conditions,spare equipment,coal,gangue,etc.to the underground and underground operations tasks,so it is in the whole of China's comprehensive mechanization of mining production occupies an important position.With the development of industrial intelligent manufacturing industry,the mining industry for the lift capacity requirements are also rising,the design of the hoisting machine gradually to the middle-the direction of large-scale development,resulting in the designer more difficult to manufacture and processing.Mainly reflected in the machine design economy and safety and reliability and smooth and efficient operation.From an efficient and economical perspective,In the design phase,the various types of parts of the hoisting machine system type,artificial sea election difficult,difficult to get the best combination of selection,resulting in poor economic,In the operation phase,the hoisting machine system running speed changeable,it is not easy to obtain the best match speed each time,causes the high efficiency.From the point of view of safety and reliability,The traditional design method of the hoist(cycle test method)due to the large number of institutional parameters,cumbersome calculation of some parts of the failure of the form of large deviation,will make the hopper in an unsafe range of operation.From the smooth operation point of view,Hoisting machine wire rope running by the impact of jitter,offset and other non-smooth operation.Therefore,to find a way to clarify the friction slip mechanism calculation method and optimize the hoist operating parameters means,will effectively improve the safety and stability characteristics of the hoist system.The development of a variety of models based on MATLAB programming to achieve a variety of models automatically optimize the selection of software,will be an effective means to solve the artificial sea election economy is poor.But also will be in the theoretical analysis and practical case is of great significance.Based on this,the multi-rope friction hoist is taken as the research object,and the method of multi-rope friction hoist optimization and the safety and stability of the operation are studied by using the wire rope bearing condition,running speed and main-auxiliary parameter calculation as the key factor.The Therefore,the main research work and achievements are summarized as follows:(1)Multi-rope friction hoist running safety and anti-skid characteristics are closely related to select the appropriate combination of wire rope and friction wheel angle,can significantly improve the anti-skid performance.However,the envelope angle calculation formula has been traditionally used by Euler method because of its nonlinear characteristics.The best circumference criterion is(0 ~ ?)radians,and its range is too large,which is not conducive to the best Wrap angle.Based on the analysis of the force distribution mechanism between the wire rope and the friction wheel,the force radian variable0? and the unconfirmed curvature variable 0?-?.According to the effective radian angle ?,the mathematical model of the friction angle between the effective curvature of the friction hoist and the tension on both sides of the wire rope is constructed according to the mechanism of the steel wire on the two sides.(2)The smooth operation of the multi-rope friction hoist wire rope is closely related to the force characteristics under different loads,and it is possible to reduce or eliminate the "mutation" phenomenon by finding the "abrupt" point in the process of accelerating to constant speed and constant speed to slowdown The Based on the theory of static mechanics and dynamics,the dynamic law of steel wire rope in the T cycle is analyzed,and the dynamic tension model of the wire rope based on MATLAB / simulink is established.The results show that the occurrence of "abrupt" point is directly related to the length of the drape rope,the load and the acceleration,and further study the quantification limit of the above three factors to realize the multi-rope friction hoist The smooth operation of the wire rope provides a prerequisite basis.(4)The high efficiency of multi-rope friction hoist is closely related to the selection of motor and wire rope.The parameters such as one lift,primary energy consumption,motor capacity and wire diameter depend mainly on the running speed of the hoisting machine.The acceleration phase is divided into the acceleration phase-the constant phase-the deceleration phase-the crawling stage-the parking phase.The five stages are run or the acceleration phase is divided into two phases: initial acceleration and main acceleration.Therefore,with the constant acceleration as the constraint condition,the fifth-order and sixth-order velocity curve operation model is established.Compared with the traditional third-order velocity curve operation model,the fifth-order and sixth-order velocity curve operation model is better and the running time is better The third-order velocity curve running model does not violate the safe operating conditions but the running time is short.Therefore,the third-order velocity curve running model is used as the reference model to establish the ratio of the other velocity curves of the friction hoist to the reference model The relationship between the relative velocity and the lifting capacity,the energy consumption,the motor capacity,the wire rope diameter is obtained,and the relative velocity values of the best and not uniform are obtained.The weighted average method is used to minimize the relative velocity The reciprocal relative velocity value(dimensionless value)of 0.41 is obtained by taking the reciprocal of the value as the weight coefficient,and the parameters such as one lifting capacity,primary energy consumption,motor capacity and wire diameter are optimized.(4)Based on the actual operation parameters of a preliminary design of a coal mine in Fukang City,Xinjiang,the software of automatic optimization of various models of various parts of the hoisting machine system based on MATLAB programming is developed.The software of optimized selection is developed,The quick and easy calculation,selection,inspection and storage function of the friction hoist are realized,and the feasibility of the method is verified.