Xu Hui Zhang

Remote Monitoring and Control System for Electrical Haulage Shearer

For the requirements and problems in remote monitoring and control system of electrical haulage shearer, this paper research the key technologies of shearers remote monitoring and control system, such as position and attitude testing, control strategy decision, communication real-time and reliability of network. Position and attitude testing method based SINS (Strap down Inertial Navigation System) was designed to measure position, attitude angle, speed and drum height of shearer together. The shearer control strategy based on work mode was proposed to control shearer working in optimal status. Finally, the network control model of shearer was established in order to analyze the time delay that effects on shearer control system.

Dynamic Simulation Analysis of Belt Rupture for Belt Conveyor

To study the dynamic characteristics of belt conveyor during belt rupture, the finite element dynamic model of belt conveyor was built. Dynamic simulation system of DTII type belt conveyor was established with AMESim. The simulation parameters were determined by DTII type belt conveyor design manual and the dynamic model. The speed, displacement of break point and mechanic characteristic carve in break moment were obtained. According to the result, the optimal capture time was confirmed.It provides the theoretical basis for the design of belt rupture equipment.

Steel Cord Conveyor Belt Defect Signal Noise Reduction Method Based on a Combination of Wavelet Packet and RLS Adaptive Filtering

Electromagnetic signal of steel cord conveyor belt defect is easy to be disturbed by Strong non-stationary noise in coal mine, even some defect signal may be overwhelmed by noise. Therefore, the defect signal noise reduction method based on a combination of wavelet packet and RLS adaptive filtering was put forward. Firstly, defect signal was decomposed by wavelet packet and got multi layer high frequency detail signal for wavelet packet decomposition. Then, the sum of multi layer high frequency detail signal was used as noise reference signal of RLS adaptive filtering. Finally, defect signal was reduced noise by RLS adaptive filtering. The noise reduction method was used to reduce the strong non-stationary noise of steel cord conveyor belt joint electromagnetic signal. The experiment results show that the noise reduction method had good filtering effect to non-stationary noise of steel cord conveyor belt defect signal, which can ensure defect signal to be effectively extracted. It has very important significance for the prevention of broken belt accident.

SVM Classification Model Parameters Optimized by Improved Genetic Algorithm

SVM classification model has been widely applied to mechanical equipment fault diagnosis and material defects classification. It is difficult to choose the optimal value of penalty factor C and kernel function parameter for SVM model. Therefore, an improved genetic algorithm to optimize SVM parameters is put forward, which improves crossover and mutation operators and enhances convergence properties by using the best individual retention strategy. UCI data set is used to verify the algorithm. The testing results show that the algorithm can quickly and effectively select optimal SVM parameters and improve SVM classification accuracy.

Analysis and Design an Electro-Hydraulic Type Belt Capture Device for Belt Conveyor

Aimed at the frequent accidents of conveyor belt and the the lower level of belt fracture protection in coal mine, this paper introduces a novel device equipment, the Eectro-hydraulic type Blt Cpture Dvice (Eh-BCD) to achieve safe and reliable working of steel cord conveyor belt. Firstly, after analysed the typical capture device existing on the market and researched the mechanical properties of the instant belt, an electro-hydraulic control type capture device solution was put forward, its work principle and main modules were introduced also. Secondly, main parts force of capture device calculated using Newtonian mechanics, designed and calculated the mechanical structure of the device, and determined key parameters such as installation space. Finally, after kinematic model built and analysed, device response time parameters the electro-hydraulic controlling capture was estimated.

Defects Classification of Steel Cord Conveyor Belt Based on Rough Set and Multi-Class v-SVM

Because of steel cord conveyor belt with high load operating and complex conditions of coal mine, it is prone to cause conveyor belt horizontal rupture. It will bring tremendous hazards for coal mine production. Twelve time domain features of joints signals, broken wires signals and abrasion signals for steel cord conveyor belt were extracted with weak magnetic detection system. The algorithm of combining rough set based on information entropy with multi-classbased on binary tree was proposed to classify the three categories signals. The experiment results show that rough set reduction algorithm based on information entropy can effectively achieve feature reduction and classification speed of multi-classclassification algorithm based on binary tree can be improved by rough set feature reduction without changing classification accuracy.

Communication Interface Design of Mitsubishi Touch Screen and DSP

Aiming at the disunity problems of the interface types and protocols existing in the communication between the touch screen and the DSP controller, this paper puts forward a kind of communication method based on MODBUS protocol of the Mitsubishi touch screen and DSP controller. By using a standard RS232 interface and MODBUS RTU data transmission format realize the asynchronous communication between GOT touch screen and TMS320F2812 controller. Through the RS485 bus, DSP achieves the communication with ABB frequency converters. Using this method Mitsubishi touch screen, DSP and frequency converter finished communication. So that touch screen can display the working status of the ABB frequency converters in real time. It has been verified by test that data transmission is reliable and good real-time.

Research on Shearer Rocker Gearbox Fault Location Based on Wavelet Envelope Demodulation

To solve the problem of faults location for shearer rocker gearbox, the multiple sites vibration signal of faulty rocker gearbox are collected, as well as the Morlet wavelet envelope demodulation is applied to demodulate vibration signal and Fourier transform is used to carry out frequency spectrum analysis of vibration signal. Experimental results show that this method can effectively extract the faults feature frequency from complex vibration signal. The faults location result is consistent with actual faults part. This mean realizes to locate faults accurately. It provides an effective method for mechanical faults diagnosis of shearer.

Fault Diagnosis of Bearing in Mechanical Drive System Using Wavelet Analysis

Exploring a proper wavelet base function to characterize fault information of mechanical equipment is a big problem when wavelet analysis is applied into the field of fault diagnosis.Improper wavelet base function can dilute fault information, which will cause difficulties in fault diagnosis , based on the principle that the wavelet domain oscillation waveform are similar to the detected signal components, a proper wavelet base function was selected; through wavelet transform on the acceleration signals of the fault bearing, the spectrum chart of fault signals and the frequency characteristics of fault bearing were obtained. The experimental result shows that this method has a great advantage over extracting character signals.

VR-Based Remote Control System Design for Shearer

Aimed at the problems existed in remote monitoring system of shearer, this paper put forward a new remote control strategy of shearer based on virtual reality (VR) to achieve control visualization and automation of equipment in coal face. Firstly, after analysed the control demands of shearer in the automatic coal face, an overall scheme of coal mining machine virtual control system was put forward, its working principle and main composition were introduced also. Secondly, the methods and procedures for VR-based remote control system for shearer using Quest3D, such as virtual control platform, logic control, data transmission and communication were described. Finally, the experiments were carried out to validate and evaluate those technologies. The experimental result show that the VR techniques were the effective and efficient way to carry out remote control of mining equipment and to improve safety and reliability of production in coal mine.