Research And Application Of Load Measurement Technology For Vertical Shaft Construction Hoist Based On The Pressure Of Head Sheave Base

Vertical shaft construction hoist which builds the main channel for mine projects and ensures the orderly development of mine production has always been the main equipment for mine construction.With the continuous deepening of mining shaft,the work difficulty of vertical shaft construction hoist is improved continuously.While owing to the changing of lifing objects,the uncertainty of the load is also gradually strengthened.Meanwhile,the long time work will lower the strength of the wire rope.Then the joint effect of the two factors will seriously threanten the safe operation capability of the system.Therefore,in order to enhance the measurement accuracy,response speed and the capability of safe operation,a load measurement system for vertival shaft construction system is designed on the basis of the base pressure of the wheel in this paper.Firstly,the wheel base is determined as the mounting position of measurement sensor by taking the ease of installation and maintenance into account.Considering the static and dynamic characteristics of the sensor,the selection indexs are quantitatively maked according to the actual requirements of the vertical shaft construction hoist system.Furthemore,a double shear beam sensor could be selected as the measurement core for the system.Next,the static and dynamic force of the system are analyzed to obtain the quatitative expression between the pressure on the sensor and the mass of the lifting object.Finally,the simulation model is established to verify the validity of the designed load measurement scheme by detecting the pressure of the wheel base in the Matlab/Simulink environment.Secondly,in order to improve the measurement accuracy of the load measurement system for shaft construction hoist,the error analysis and compensation strategy are carried out in this paper.Above all,error tree is formulated to summarize and analyze the errors.For the error of the sensor itself,it is determined that the wire rope deformation is the main error through the mathematical calculation and simulation analysis,and an iterative error compensation algorithm with variable initial slope is proposed to eliminate it.For the error caused by the signal transmission process,Kalman filtering is applied to eliminate it.For the error caused by the signal processing process,a special signal modulation circuit is designed to avoid the operational amplifier noise which will affect the measurement accuracy.Then corresponding simulation models are built to verify the effectiveness of the proposed error compensation measures.At last,the dynamic Markov model is applied to analyze the reliability of the designed system.The results show that the reliability of the designed system is more than 50% higher than a single sensor system.Finally,from the perspective of practical application,the hardware architecture and software program are designed mainly including MCU circuit,signal modulation circuit,AD sampling circuit,short-distance wireless transmission circuit,humancomputer interaction circuit and non-volatile memory circuit.Of course,the corresponding operating programs are verified in MCU.Finally,the test platform is built and debugged,whose results could satisfy the design requirements of system.Meanwhile,the verification of the error elimination algorithm is performed by using the industrial field data,whose results show that the proposed algorithm can effectively improve the load detection accuracy.