Design And Research Of Hoist Disc Brake For Diagnosing Fault And Monitoring Brake Positive Pressure

As an important component of the mine hoist braking system,the disk brake is the ultimate executor of the entire braking system.Its performance directly affects the safety and reliability of the lifting system and has great significance in ensuring the safe and efficient production of coal mines.The failure of the brake caused by the lack of positive brake force leads to frequent occurrence of braking accidents on the hoist and economic losses.It also seriously threatens the life safety of the workers.Therefore,the safety and reliability of the brakes need to be improved.This paper takes the hydraulic cylinder rear-mounted disc brake as the research object,based on the original structure,studies the failure mechanism of the brake,analyzes the deficiency of the existing safety measures,design a disc brake that can monitor the brake positive pressure and have a certain fault diagnosis function.The main research contents of the paper are as follows:(1)The factors affecting the safety and reliability of the brake are analyzed,the failure mechanism is studied,and the failure modes are summarized.The directional analysis analyzes the advantages and disadvantages of the current preventive brake failure measures and discusses the necessity of designing a disc brake that can monitor the brake positive pressure and has a certain fault diagnosis function.(2)For the problem that the brake clearance and disc spring force are normal and the brake pressure is insufficient,the overall structure of the disc brake with diagnosing faults and monitoring positive brake pressure is determined.Design the key components of the disc spring force sensor and the positive brake pressure sensor and propose a high reliability monitoring scheme for the brake clearance.(3)The overall structure of the brake and the performance of key components were studied.A simplified virtual prototype model of the entire brake and its key components was established.The finite element analysis software ANSYS Workbench was used to perform modal analysis and statics analysis.The natural frequency and mode shape of the brake and the structure strength of the key components were obtained,which provides a reliable theoretical basis for the experiment.(4)The measurement circuit and conditioning circuit of the sensor signal are designed.Through the finite element simulation,the specific fitting position of the strain gauge is obtained,so that the sensor can output an effective signal and can be effectively collected and recorded.(5)A disc brake with a function of monitoring positive brake pressure was prototyped.The static characteristics of the disc spring force sensor and the brake positive pressure sensor were analyzed in the laboratory and the brake was tested in the field.The experimental results show that the disc brake can realize the real-time effective monitoring of the positive brake pressure,and the strength and rigidity meet the requirements for use,and the correctness and effectiveness of the proposed structure scheme are verified.