Coal Mine Dynamic Rail Weighbridge Based On Embedded System Measuring Accuracy

In recent years, with the rapid development of computer technology and thehardware equipment replacement to upgrade, embedded development technology onindependent development of roads, all kinds of embedded equipments become moreand more, the embedded operating system has been used in many fields, especially inthe field of industrial control. The dynamic track scale is the embedded technologyand the development of industrial automation control is combined with a significantproduct.Dynamic track scale produced in twentieth Century70 time evening in ourcountry, due to time restrictions on the means of science and technology, itsapplication range is small, product upgrading slowly. Until the late 80’s, dynamictrack scale measuring technology has made breakthrough progress, dynamic trackscale in the field of transport is widely used, mainly installed in the station, port,mining and other is equipped with a special railway line track, used to achieve thevehicle park the case of measuring the loading amount, for the production of theenterprise activities and the state regulatory help. Enter after twenty-first Century,dynamic track scale in coal, iron ore and other large mineral resources miningenterprises in the extensive use, mainly used for the measurement of the productioncapacity of enterprises. But the mineral enterprise production environment is bad, themain features of high temperature, high humidity, dust, electromagnetic interferenceand noise pollution is serious, these with the railway transport in the environment aredifferent, so if the railway transport using dynamic track scale system directapplication in mineral enterprise, its measurement accuracy will be greatly weakened,measure the tramcar weight.Based on the original dynamic track scale measuring system structure andprinciple of measurement research, put forward from the hardware design andsoftware algorithm two aspects are improved, which can meet the requirements ofmeasurement under special environmental condition. First, from the hardware aspect,since the track scale weighing sensor selection started on measurement system wasimproved, first select the high measurement precision, fast acquisition speed ofresistance strain sensor as a data collector, after the design of the signal amplificationcircuit, the data was collected and amplifying operation, while eliminating the null drift phenomenon. Design of signal filtering circuit the acquisition of analog signals tothe filtering operation, removal system for generating interference signal wave. Thecircuit is added to A / D conversion module, will collect the analog voltage signal isconverted to a digital signal level. The whole process of the independent powersupply circuit for power supply, and power supply is installed in a relatively closedmetal box, to reduce electromagnetic interference, at the same time, power supplygrounding operation. In the signal transmission process, using RS-485bustransmission, abandon the past RS-232industrial bus transmission, can effectivelyavoid the signal transmission in the process of interference and attenuation.From the aspect of software, mainly in the MATLAB simulation environment inthe realization of the collected digital signal decomposition. The received digitalsignals to the interception of the operation, setting a threshold value of 25, thethreshold below 25digital signals to abandon the operation. After the MATLABsimulation software using wavelet neural network toolbox and empirical modedecomposition algorithm for the data collection for signal decomposition. After thedecomposition of the signal into the actual car weight, recorded as measured value,the measured value and the actual value through the formula for the computation,finally get the measuring precision, high measuring accuracy of selection algorithm asthe final signal processing algorithms, and on two kinds of algorithm for measurementresults are compared, to find the optimal signal processing algorithm, this is the maininnovation of the paper.In conclusion, this thesis on coal mine dynamic track scale system hardware andsoftware two aspects to improve the study, to improve the measurement accuracy of.