Study On Torsion Performances And Recycle Device Of Hanging Hoist Rope In Deep Shaft

Multi-rope friction hoist is widely used in the shaft,not only to put miners or equipment down,but also to lift coal and gangue.The hoist ropes shall be replaced according to the coal mine safety regulations after being used for a certain period of time.During the replacement and recycle process through the underground tunnel,especially in deep shaft,there are severe safety problems: torque accumulated in the internal of hoist rope during using will be released during the recycle process,likely to cause hoist rope tied up,and even the operator will be hurt by the fast movement of the rope end.The recycle rely more on the manual pulling back,having low efficiency and high labor costs.Considering the problems in the recycle of the hoist rope,a recycle device is developed and designed based on the hanging wire rope twisting performance,which can control the internal torque releasing,and use mechanical force to recycle wire rope.In the process of recycling hoist rope through the underground way,the reasons for hoist rope rotation in the wellbore are explained from the perspective of the spiral structure.The internal torque and the elastic deformation of the wire rope are analyzed by using the static equation of the hanging wire rope.Taking the wire rope with a length of 650 m and a diameter of 46.50 mm as an example,the internal torque is about 560N?m,by regression formulas,the lower end twist angle displacement is about 118 cycles from initial position to equilibrium position.Seven rope sections as representatives are simulated,from the hanging steel rope with a length of 650 m.The simulation results show that the maximum and stable values of the twist angle are negatively linearly related to the distance from the bottom of the rope.The maximum twist displacement at the lower end during the torsion period is about 209.2 cycles,and the ultimate equilibrium position is about 118.3 cycles away from the initial position.Simulating the bottom rope with 19 m length,the centrifugal force can be reduced to 18.7N when the torque releasing time increased to 240 s.The idea of setting the torque release mechanism at the bottom of wire rope to reduce the torsion speed is proposed.Design the driving mechanism,the clamping mechanism,the rope arranging and the torsion releasing mechanism of the recycling device.Establishing the assembly model of the device,simulate the work process by using RecurDyn in full load condition of 6.5t.The force between the wire rope and the rope wheel fluctuated in the vicinity of 220 N with small amplitude,and the force with the rope arranger fluctuating between 30 N and 50 N,Indicating that the recycle process is relatively stable.The minimum vibration frequency of the frame is 28.877 Hz,which is higher than the rope wheel collision excitation frequency 2.34 Hz.Through dynamic analysis of the starting-up process of the recycle device,the maximum displacement of the frame is 1.1891 mm and the maximum stress is 78.473 MPa,which is much less than 235 MPa of the frame material yield limit.Through the above research,it is proved that the continuous recovery device designed in this project is suitable for the underground way of recycling hanging steel rope.