Research On Consequent Synchronous Wire Ropes Replacement Device For Multi-Rope Friction Hoist

Along with the advance of mine lifting technology in our country, multirope friction hoist has been widely used in the vertical shaft hoisting system.The rope replacing job is more frequent and needs to be done in the well borewith more operating personnel. The existing rope replacement devicessignificantly reduced the operation time and improve the security and reliabilityduring the rope replacing operation. Widespread disadvantages exists in currentrope replacing device, such as, poor mobility, weak synchronization, smallapplication scope and so on. More seriously, there was more hidden dangerduring the operation like rope damage, rope slipping and hoist system damage.Through the above analysis, the shortcomings of existing rope replacing deviceseriously affected the safety and efficient production of mine. Therefore, it hasgreat significance on designing a new type of the first rope replacement device.This paper analyzed the deficiencies and defects of the first ropereplacement process and auxiliary device for rope replacing and put forward thedesign goal for the new type rope replacement device. After scheme comparison,the design scheme of the mobile synchronous replacement device for host ropes of multi-rope friction hoist was determined. The composition and workingprinciple of the mechanical system were elaborated in detail. The hydraulicsystem which is match to the device was designed and the function of thehydraulic system and loop operation characteristics were analyzed.The hydraulic system simulation model was built through the simulationsoftware AMEsim. In order to analyze the dynamic characteristics of hydraulicsystem, the system pressure, the rated flow of electromagnetic directional valveand other key parameters were set up to analyze. By comparing the simulationdata and considering the design requirements, system stability and energy saving,the system pressure, the electromagnetic directional valve rated flow and otherparameters were selected reasonably and optimization against to those keyparameters were also completed.In this paper, the meshing mechanism and dynamic characteristics of thechain driver in the continuous rope feeding mechanism was analyzed throughdynamic analysis and ADAMS simulation software. Through the analysis ofsimulation results, the sprocket teeth were the key factors that influenced thestability of the device and the rope feeding operation. With the increase ofsprocket teeth number, polygon effect of the chain drive weaken, velocityperturbation decreased, the same as the driven wheel angular velocity.Simultaneously, the contact force between link and gear also decreased thatmeans the stress and strain of transmission components decreased and the safetyefficiency improved. The dynamic characteristics of the continuous rope feeding mechanism andwire ropes under different rope changing working conditions were simulated.During the rope feeding process, the impact of the continuous rope feedingmechanism was less than the traditional devices and the velocity was more fastand stable. Through the comparison between the simulations results, when thefeeding speed and the rope load increase, the fluctuation of the dynamiccharacteristics of the devices and wire ropes became aggravate that means thesafety and reliability of the device during the operation reduced.The co-simulation model of the rope-catching device was built and thedynamic characteristics of device and wire ropes under different rope changingworking conditions were simulated. During the catching process, the mechanicalsystem and hydraulic system could catch the slipping rope coordinated whichimproved the safety and the catching time decreased when the slipping speedand the rope load increased.