Design And Research On Multi-rope Friction Hoisting System Overwinding And Overfalling Device

The multi-rope friction hositing system is a complex electromechanicalhydraulic integrated equipment,which is mainly composed of the hoist driver and brake system,multiple wire ropes(head rope and tail rope),head sheave(or guide wheel),hositing container,etc.It is the "throat" that connects ground and underground of mine,and has been widely used in thousands of mines in China and abroad.In general,the equipment arranged in the large space(such as thousandmeter deep well),and has high speed and heavy load.The experiment of normal load start and stop control are difficult to carry out.Moreover,the abnormal(such as sudden power failure)safe braking,the "false braking" and "refusal to brake" in the fault state cannot be tested.The experiments on its vicious causes,such as over-winding,over-falling,and broken rope,are also helpless.The frequency conversion speed regulation and gate control device of the lifting system have a good cooperative operation,self-protection and mutual protection for the normal working conditions and partial fault working conditions of the lifting cycle operation.However,the occasional accidents of over-winding and over-discharging will cause the lifting container can not be stopped normally.Although over-winding buffer technology has made great progress,for the frictional lifting system with high-speed and heavy-load characteristics,abnormal(such as sudden power failure)safe braking,"false braking" and "refusal braking" in the fault state can also lead to the vicious accidents of over-winding and overreleasing,which will cause heavy casualties and huge losses of equipment.Therefore,it is very necessary to study the malignant accidents,but there are no experimental conditions for studying the malignant accidents,which is not conducive to effectively solving the process analysis of the malignant accidents.Therefore,it is necessary to explore the method of testing under over-winding and over-discharging fault conditions.In this paper,a kind of over coiling buffer device based on steel strip deformation and hydraulic energy absorption is designed,which is mainly based on the hydraulic energy absorption buffer of the oil cylinder and supplemented by the steel belt plastic deformation energy absorption buffer.Double energy absorption can effectively improve the speed of energy absorption,alleviate the over rolling impact,shorten the braking time,thus avoiding the occurrence of malignant accidents,which is conducive to the recovery of production and operation of the mine hoisting system.Designing and calculating the braking force of the hoisting machine during over-winding and over-discharging,and simulating the stress and strain of steel belt.The results show that the influence of the thickness of the steel strip on the braking force is greater than the width of the steel strip.The simulation results are consistent with the theoretical analysis results,which verifies the correctness of the simulation.Combined with the simulation results of the steel belt,a combined hydraulic and hydraulic simulation study was conducted on the overwind buffer device.The simulation results of the hydraulic cylinder parameters can met the design requirements,which can prove that the device can achieve the overwinding buffer function designed in the whole machine system.Using virtual reality technology to build a virtual simulation experiment platform of the lifting system.Based on the interaction principle of the MVC model,from the aspects of scene roaming and collision detection,the implementation method of improving the learning and cognitive function of the system is explained.Virtual assembly of lifting system is realized through model movement and distance detection function.Using the quaternion spherical linear interpolation theory,the start-stop control operation of the hoist is realized,which mainly includes the brake shoe switch,the drum forward and reverse,real-time speed and oil pressure changes,and the start-stop operation of the hoist under the actual working conditions is truly simulated.Based on the realization of learning cognition and the start-stop control function,combined with the simulation results of the steel belt,a virtual simulation study was conducted on the two states of the presence or absence of the overwind buffer device.The motion simulation of acceleration winding and full-speed winding under the condition of without(with)winding buffer device were carried out respectively.Combined with the over-roll buffer device to achieve the motion simulation of the catching process,the coupling effect of the two-state lifting container and the over-roll over-release device was compared and analyzed,and the entire process was visually displayed to verify the function and work of the over-roll buffer device.The multi-rope friction hoisting system virtual simulation experiment of over-winding and unwinding solves the problem of inability to conduct on-site experiments and destructive tests,and achieves the expectations and goals at the beginning of system development.It is of great significance to further realize the visual real-time monitoring and intelligent transportation of the multi-rope friction lifting system.