Latest ArticlesThe new traction substation in Baiyun Iron Mine is responsible for direct current system power supply of the whole mine. The 6 000 V alternating current is rectified into DC 1 500 V to supply power for the whole mine's railway production system. Now it is being upgraded, and during the test of power supply line, coil burning of circuit breaker occurs. According to the phenomenon of circuit breaker burning, causes for coil burning of circuit breaker are analyzed, and protective circuit for preventing coil burning of circuit breaker is put forward.
The high voltage motor can effectively prevent its impact on surrounding power grid in the starting process by using frequency conversion control, realize the stepless speed regulation and meet the requirements of production process on motor speed control by using high voltage converter, so as to improve the yield and quality of products, as well as greatly save energy and reduce production cost. But the high voltage converter has bad effect on power grid and electrical equipment. Therefore, it is also important to pay close attention to whether the frequency conversion technology can work stably in the application of high voltage motor.
The failure causes of numerical control lathe jitter are complicated: lathe jitter caused by external environment influence; lathe jitter caused by workpiece clamping and workpiece material in the workpiece process; lathe jitter caused by lathe equipment defects. Through summarizing the jitter causes and case analysis, common jitter causes and maintenance ideas in maintenance are put forward and the lathe jitter failure of actual site is solved.
Common handling methods of single phase grounding fault include arc compensation method and contact arc suppression method, the arc suppression coil compensation method is applicable to temporary grounding fault, while the contact arc suppression method is suitable for dealing with permanent single phase grounding fault. Aiming at the problems of 6~35 kV neutral ineffectively grounded system, the MXJD single phase grounding fault management system integrates the advantages of the two grounding modes, solves the accuracy problem of fault line selection, and provides flexible, fast and effective fault handling methods.
Roller is one of the most important large-scale tools in iron and steel production enterprises, and the amount of roll consumption has the direct impact on enterprises costs. Therefore, reducing roll consumption is an important measure for iron and steel production enterprises to reduce costs. In the paper, the influencing factors of roll consumption of rolling mill in Rail and Beam Plant are analyzed and described in detail from the aspects of roller design structure and strength selection, roller processing and assembly technology, roll usage and so on, and improvement measures are put forward.
The collecting ring of 783kW synchronous traction generator is severe worn to limit, accompanied by risks of hidden danger expansion at any time, which is seriously harmful to the safety and smooth operation of equipment. In order to save renewal fund and maintenance cost of equipment, technological transformation for collecting ring of 783 kW synchronous traction generator is carried out to strive to achieve the self repair of collecting ring and restore to the design standard, greatly prolong the service life of equipment, reduce the production cost, improve the technical condition of equipment operation, and ensure the smooth operation of equipment economy.
In order to realize office automation, improve management level, organize production efficiently and orderly, and maximally share plant resources, Rail and Beam Plant in Baotou Steel has constructed LAN. Through the design of LAN, VLAN re-division, firewall configuration and IP address allocation to achieve the isolation between office network and production network, provide the strong guarantee for information construction in Rail and Beam Plant.
In the paper, it is introduced the successful application of ABB medium voltage frequency converter (ACS6000) in Rail and Beam Plant of Baotou Steel, and the main power module unit of ACS6000 SD system is described in detail. Combined with ACS6000 SD medium voltage frequency converter in speed regulation drive control of synchronous motor in large H-beam line finishing mill, the application characteristics of ACS6000 medium voltage frequency converter and direct torque control and other advanced technologies in synchronous motor are described.
The secondary transfer production of railway rock is an important link of production process in Baiyunebo Iron Mine. Due to production constraint, route condition, influence of external environment and so on, the laying period of each rock dumping route is different, and the laying period of some routes is postponed to winter, which is unfavorable to production. In this article, through the measures of regulating the yield, governing the single end, extending the routes, adjusting the width of track and relaxing the ditch-pond, the laying of winter is postponed to summer and autumn to save costs, improve productivity and ensure safe production.
The influence factors of electric locomotive such as long service life, line condition declining and relatively small curve radius of movable rock dumping route often lead to the failure of spindle thread damage in the 150t electric locomotive. Thus, it is not conducive to safe production and requires the welding and turning of spindle thread to improve the use safety and operation rate of electric locomotive.
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