Design Of Winch Lifting Signal System Based On CAN Bus

In recent years,with the increasing development of coal production technology,the corresponding coal mine safety situation has become an important evaluation index in production.Due to the harsh production environment and insufficient communication conditions,frequent safety accidents have occurred during the transportation of connected wells and downholes.In addition to further raising the awareness of man-made safety management,it is more important to establish an efficient and stable production and transportation signal system to form a safe and reliable signal transmission mechanism and a safety early warning system for uphole/downhole.In China's current underground winch hoist signal system,it is still in a state where the automation of information processing is not perfect,the system maintenance is difficult,the signal transmission is not stable in a complex environment with high radiation,the traditional carrier bandwidth is small,the bus anti-interference ability and the transmission distance are small It is difficult to ensure the stable transmission of the boosted signal due to the near-end problems.In response to the above problems,in order to achieve efficient and stable point-to-multipoint transmission between the mine winch lifting equipment and the signal node of the machine room,this paper analyzes the transmission mode and message structure of the CAN bus,combined with the equipment structure of the coal mine winch lifting system,the CAN The bus replaces the RS-485 bus to introduce a coal mine winch lifting signal system,performs software function design and hardware implementation,and optimizes the transmission distance.A high reliability and high efficiency winch lifting signal transmission system based on CAN bus is developed.The specific contents are as follows :First,the subject designed the system functions according to the actual production environment,and established a lifting signal transmission system composed of a wellhead signal controller,a horizontal signal controller,and a driver winch room signal station.On this basis,each signal station Complete the erection of CAN bus and its annunciator.In terms of hardware design,the system selects low-power STM32 as the main controller,and designs hardware circuits such as the main control circuit,power supply module,interface circuit,digital voice processing module,voltage monitoring module,and signal detection module.Isolation technology and hardware error correction methods are adopted to solve the safety problems of signal data.Second,design the implementation of the system software functions to achieve signal priority judgment,voltage monitoring,digital voice processing,data detection and other functions,and design and implement node interface transceiver according to the CAN bus communication protocol,using cyclic redundancy check Ensure the accuracy of node signals on the bus.Third,for the signal attenuation during long-distance transmission,the performance of the CAN bus transmission wire was optimized,and the influence of the CAN bus on the maximum transmission distance due to factors such as topology,oscillator tolerance,bit timing requirements,and bus termination resistance was studied.The transmission distance of the system bus is optimized.And through the systematic analysis of CAN bus terminal resistance,topology and bus impedance and other parameters,the constraints that limit the transmission distance of CAN bus are obtained.By controlling the above-mentioned different parameters and conducting experimental research,the signal transmission performance of the system is effectively improved.By running tests on the built system model,the system runs stably,and each function module can be displayed and operated normally.Through the test and analysis of indicators such as rate and accuracy,compared with the original signal system,the built system communication performance The stability and safety are greatly improved.The design results were simulated at the Majiliang mine mining site in Shanxi Datong Coal Mine Company,and proved the feasibility of CAN bus used in the winch signal system,and effectively improved the safety and anti-interference performance of the winch signal system.In the actual use process,considerable economic benefits have been achieved,and it has been invested in the Majiliang mine to achieve industrial promotion and application.