Study On The Design Of The Constant Deceleration Electro-hydraulic Control System Of Mine Hoist

The brake system of mine hoist is an important part of the hoist system.In the production of coal mine,it helps to participate in the start-up and stop brake of the hoist and provides conditions for safe production.With the rapid development of industrial technology and the improvement of safety awareness,the braking performance of mine hoist braking system is required to be higher and higher.The new regulations and standards all put forward high requirements for the safety braking system.As an important function and existing problems of the braking system,constant deceleration safety braking has been widely concerned by scholars and experts.In view of the shortcomings of the current constant deceleration hydraulic control system design and the defects of function switching,in-depth analysis and summary of experience,combined with new regulations and new standards,a safe conversion constant deceleration hydraulic station is designed.The hydraulic control system can only perform one braking method at a time,which reduces the risk of brake failure and is safer and more reliable than the existing hydraulic control system.In the aspect of electric control,the electric control scheme with PLC as controller is selected and the software is designed.In order to improve the performance of constant deceleration braking,the algorithm of RBF tuning PID is used for adaptive tracking control of hoist drum speed.The RBF model is established based on the field test data,the comparison and analysis using Matlab simulation verify that the control algorithm can be better improve the constant deceleration braking performance.In order to solve the risk problem brought by the experiment,the technology of virtual simulation was used to build a joint simulation experiment platform of the simulink-based simulation mine hoist constant deceleration braking system to simulate the safe braking process of the hoist.This paper focuses on the comparative analysis of the influence of servo valve failure on the second level constant torque braking after the second level constant torque braking is implemented after the failure of constant deceleration braking.It is verified that the constant deceleration hydraulic station with safety switching function can effectively avoid the safety braking failure caused by the failure of constant deceleration,and the designed constant deceleration braking hydraulic circuit is more safe and reliable.The thesis has 70 figures,17 tables and 78 references.