1 Introduction
With the popularization and application of advanced electromechanical equipment testing and maintenance technologies in the mining industry, the production efficiency of mining enterprises has been improved. However, in the actual production process of mining enterprises, various equipment problems caused by human factors often affect the normal operation of enterprises, resulting in low production efficiency and mediocre benefits.
Therefore, it is especially important to strengthen fault diagnosis and maintenance of electromechanical equipment. In the mining industry, electrical disconnection faults are a very important part of mechanical and electrical equipment failures and require the attention of equipment management and technical personnel.
2 electromechanical equipment electrical circuit fault detection technology analysis
2.1 Resistance Detection Technology
2.1.1 Hierarchical resistance detection technology
Hierarchical resistance detection technology is mainly used to detect the value of the resistance in the circuit and compare it with the theoretical value to judge whether the mechanical and electrical equipment is faulty. Make sure that the circuit is disconnected during circuit detection to avoid short circuits. At the same time, it is also necessary to ensure that the detection circuit is in a state of independent operation so as not to affect other circuits during the detection process. After the test is completed, it is compared with the theoretical value. If the two values ​​are basically the same, it means that the circuit is running well; if the detected value is “0â€, it indicates that the circuit has a short circuit; if there is a big gap between the two values, it means that The circuit has failed [1].
2.1.2 Segmented Resistance Detection Technology
Compared with the hierarchical resistance detection technology, the segmented resistance detection technology has similarities with it. When using this method for measurement, the position of the circuit interruption road point needs to be determined first. The circuit is then divided into 2 to 3 segments and measured in segments. If the detection value is infinity, there must be an open circuit fault. After the fault is determined, the fault segment should be detected layer by layer to determine the fault point for repair.
2.2 Voltage Detection Technology
2.2.1 Ranked Voltage Detection Technology
In order to detect a circuit by using a hierarchical voltage detection technique, one end of the instrument must first be fixed to one end of the circuit to be detected, and then the other end of the instrument should be brought into contact with the point to be detected in the circuit one by one in sequence. Under normal circumstances, the specific voltage value at both ends of the circuit can be detected. If the detected value is “0â€, one end of the instrument is gradually moved, and when the point is moved to a certain point, the value changes abnormally, and two points can be determined. The circuit between them has failed.
2.2.2 Segmented Voltage Detection Technology
The segmented voltage detection technology is similar to the step voltage detection technology. In the detection process, the phased voltage detection is one end gradually moving, and the segmented voltage detection is moving in a certain order layer by layer, and the segmented voltage technology detection can be used in Reduce the number of measurements to a certain extent, reduce the detection time.
2.2.3 Earth-to-ground measurement
The basic principle of the ground-based measurement method is to analyze and determine the fault point according to the voltage to ground corresponding to each site in the circuit. When adopting this kind of technology for testing, we must first pay attention to the personal safety of the testing personnel, ensure that the multimeter's measuring range must be greater than the voltage of the circuit under test, and also close the disconnected part of the circuit under test to ensure that the meter will not be burned. Bad.
2.3 Short-circuit detection technology
2.3.1 Local short circuit method
When using partial short-circuit detection, it is necessary to ensure that the operating voltage of the electromechanical device is within the normal range. Only in this way can the detection work be carried out safely. When testing, the two points adjacent to the circuit of the detected electromechanical device are first marked, and then another line or instrument table is used as a detection tool to perform short-circuit detection between the marked two points [2]. If the voltage does not change significantly, it means that there is no fault in this segment of the circuit and the next step can be detected. If a circuit is connected and a significant voltage change occurs during the detection process, there may be a short circuit in the circuit. After a detailed inspection, the range and specific position of the short circuit are determined, and then the relevant technology is used for maintenance. ,replace. It is worth noting that the local short-circuiting method can also be applied to the electrical disconnection of electromechanical equipment when the load exceeds a certain level.
2.3.2 Segmented shorting method
The detection method of the segmented short-circuiting method is to fix a short wire in the electrical circuit, and then move the other segment to ensure the reliability of the test results and improve the detection efficiency [3]. When the segmented short-circuit method is used to detect the electrical and mechanical equipment circuit, attention must be paid to the applicable scope of the method. Including the detection device in the wire breakage, interface failures, such as disconnection faults, but can not be applied to the electrical equipment, resistors, coils and other load breaking fault detection. In addition, this kind of detection method is not particularly suitable for the detection of main circuit faults, and it is easy to cause safety accidents. During the inspection process, it must be ensured that the shorted wire used is well insulated, preventing the power supply from being disconnected and causing the original good circuit to be burned.
3 steps to detect electrical circuit failure of electromechanical equipment
3.1 Before disconnection fault detection
In the event of an open circuit fault in the mine electromechanical equipment, the electromechanical equipment inspectors should first analyze and master the circuit diagram of the electromechanical equipment, rather than blindly carry out inspections. This is the quality and expertise that the inspectors should possess. Because only the operation principle of electromechanical equipment and the positions of various large electronic components are well-recognized in order to effectively carry out inspections, scientific analysis of failures can be made on the basis of the distribution of various elements and the trend of the line to ensure One-step inspection work is effective and safe.
3.2 Broken fault detection process
Under normal circumstances, the inspection personnel conducts in-depth investigation and analysis based on the numerical values ​​reflected by the mine electromechanical equipment during the fault detection process, or conducts in-depth investigation and analysis according to the relevant performance of the electromechanical equipment when the fault occurs, and combines actual conditions with the accumulation of relevant experience. The preliminary determination is made on the range of faults occurring in the electromechanical equipment.
It is worth noting that the lines detected in the fault detection process must avoid the main loop to avoid other safety accidents. When a professional inspector cannot determine the fault scope based on the conditions at the time of fault occurrence, a more accurate detection method must be adopted until the fault location is determined. At the same time, when related inspection personnel are carrying out inspection work, they must do a good job of statistical work on related test data, write detailed troubleshooting reports, and provide data reference and basis for future troubleshooting work and troubleshooting.
3.3 After fault detection
After the mine electromechanical equipment testing technicians complete the fault detection work, they must record the cause of the fault, the detection process, and the test results in detail, summarize the relevant experience, and improve the detection level. Analyze the law of fault occurrence, and fill in the trouble ticket carefully so that in the future work, you can gradually grasp the law of the occurrence of open circuit faults, accurately determine the range and location of the open circuit, and improve work efficiency.
4 Maintenance and Management of Mine Electromechanical Equipment
(1) Accelerate the construction of an information management platform for mine electromechanical equipment. In the production process of mining enterprises, equipment management plays a very important role, which directly affects whether or not the mine production work can be carried out effectively. Therefore, the construction work of mine mechanical and electrical equipment information management platform is particularly important. With the continuous development of information technology, in order to adapt to the development of the society, the mining industry must pay attention to the information management of electromechanical equipment selection, installation, commissioning, maintenance, and update. The use of multimedia, Internet and other equipment and resources to increase the management of mechanical and electrical equipment, thereby completing the mining enterprise mechanical and electrical equipment, automated management objectives, reduce the workload of the mining company staff, ease the pressure on staff [4]. At the same time, it can also effectively reduce the labor costs and equipment maintenance costs of mining companies.
(2) Improve the maintenance and overhaul system of mine electromechanical equipment. In the course of carrying out maintenance and overhaul of mechanical and electrical equipment, enterprise inspection personnel must perform maintenance work in accordance with the operating instructions of the equipment. At the same time, an inspection and repair system shall be established in accordance with the operating files of the equipment to ensure that the electromechanical equipment continues to be in a healthy operating state. For example, the file shows that the service life of the slurry pump liner is limited to a maximum of 1 000 hours. During the inspection and repair process, the service time should be controlled within the file display time, such as 960 to 980 hours. Reduce the probability of occurrence of security risks. At the same time, according to the working environment of mine electromechanical equipment, maintenance work can be divided into on-site maintenance and planned maintenance. On-site maintenance mainly refers to the potential safety problems discovered by the inspectors during the operation of the electromechanical equipment and proposes corresponding solutions. However, contrary to planned maintenance, preventive maintenance is based on pre-existing inspection and maintenance based on possible risk factors.
(3) Improve the overall quality of mechanical and electrical equipment managers. To improve the overall quality of mechanical and electrical equipment management personnel, we must increase the introduction of advanced professional and technical personnel, to maximize the advantages of advanced equipment. At the same time, the mining enterprises should also protect and support technical talents and reward those who have special contributions, thereby stimulating the enthusiasm of team members. Enterprises should also regularly organize equipment repair and management personnel to conduct business studies and expand business skills. Link training content and assessment content with employee performance. Enterprises should also regularly invite professional equipment technicians and equipment manufacturers to conduct knowledge presentations to enterprise equipment maintenance and management personnel, and promote the maintenance and understanding of new equipment, new technologies, and new processes by enterprise equipment maintenance personnel, thereby improving the management of electromechanical equipment in mining enterprises. The overall quality of personnel.
5 Conclusion
In a word, in the process of production and operation of mine electromechanical equipment, there are many factors that cause failures. During the process of fault diagnosis and equipment maintenance, the technicians must be familiar with the drawings, fully understand and master the relevant technologies of electromechanical equipment, and support the relevant inspection techniques. Accurately determine the location of the circuit fault, effectively solve the problem and improve the equipment operating efficiency. At the same time, we must also intensify the innovation of mine mechanical and electrical equipment maintenance work, improve the maintenance and overhaul management system, establish an information management platform, and improve the overall quality of mechanical and electrical equipment management personnel.
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