Application and Maintenance of DQZBH-3001140 Vacuum Magnetic Starter

The Use of Tongji Coal Science and Technology 0, 7830040 Type Vacuum Magnetic Starter and the Questioning and Solving Method Existing in Wei Liqi's Practice.

0B83040 type vacuum magnetic starter, also known as the switch is mainly used for downhole 660 or 40, the power supply system for starting and stopping the motor 1 device performance The magnetic starter uses a flat stop type quick opening door structure, to bring maintenance and overhaul Convenience. However, because each time the fault is dealt with, a layer of rust-proof oil must be applied to the door, and the gap between the explosion-proof surfaces is easily filled with oil. It is very difficult to close the door and often requires hammering. Over time, the explosion-proof and twisted structure is deformed or the explosion-proof surface is scratched. , resulting in loss of energy.

Some electrical components have a short life span and cause frequent switching accidents.

The components that are more easily damaged in the field are: burning of the main control transformer, accounting for 30 in the overhaul switch. The resistance absorption device is damaged. In the overhaul switch, about 40.2213 intermediate relay coils are burned, contact explosion, contacts Contact + good. Protection components 8 are often damaged. During the overhaul of the switch into the factory, the overload protection component was tested for overload characteristics. There were 60 rejections or inaccurate operating times. The inverse time characteristics of the design were not consistent. , The plug-in socket of the control circuit, such as the Niuzi switch, often suffer from poor contact.

Some circuit designs in the protection circuit are unreasonable. For example, the relay in the short-circuit protection circuit is protected by the fault-sucking mode.

0, when the relay uses 15 DC voltage as the power supply, when the near-end short circuit occurs on the load side, the secondary side basically has no voltage output relay in the power supply network to lose the working power, even if the switch has tripped, only other relays are in the state of no pressure release. Or it is tripped over, so the circuit for faulty pick-up is not correct.

These components are not easy to repair and replace. If the vacuum contactor is assisted, closed, etc., the layout is unreasonable, and the vacuum contactor assembly needs to be completely removed to repair the failure of the auxiliary switch. Although the failure is small, it is very inconvenient when dealing with downhole.

2 The use of the existing fully mechanized mining face in the face conveyor or lower power protection for correct setting, resulting in one of the switches can not be protected, easy to burn the motor.

Because of such frequent switch failures, due to reasons such as on-site maintenance personnel's technical quality, tool accessories, etc., failures cannot be dealt with in a timely manner, affecting normal production time. Therefore, the phenomenon of getting rid of protection is more common. The main point is that the direct contact shorting relay contacts. This will completely remove all the protection of the switch, resulting in no protection. , Remove the DC detection line of the leakage lock protection circuit and remove the leakage lock protection. Because the underground environment is bad, the cables are often damaged, and the leakage phenomenon occurs from time to time, so it is very dangerous to get rid of the leakage blocking protection.

Remove the overvoltage protection resistance absorption device. Due to the influence of many factors such as the contact gap circuit parameters of the vacuum switch tube contact materials, it is easy to generate an operating overvoltage. In particular, due to downhole production conditions, vacuum switches often need to disconnect the motor just started, this motor power factor is very low, so cut off transient over-voltage is also not to avoid the insulation of electrical components in the switch or switch Big threat.

3 Repair and Maintenance Nowadays, because some manufacturers of electrical components have poor quality awareness for some small profits, the products produced are not satisfactory. Therefore, the repair department is required to set a good quality when ordering electrical accessories.

Select skilled personnel to purchase.

Nowadays, many of the counterfeit and inferior products of the electronic protection component plugs of such switches have occupied a considerable part of the market among repair shops and users at a low price or by other means. Through the testing of these products, it was found that almost 100 existed in one way or another, so we must resist these products.

Strengthen the technical training for employees so that all repair personnel have mastered the technical performance of the switch repair process repair methods, etc., to strengthen the quality of repair personnel and the sense of responsibility for the safety of users, the product of the repair out of excellence. Turn down page 15 to install a pitot tube on the angle iron frame, use a hose to connect the static pressure end to the ground, and measure the relative quiz of the most fan inlet.

4 Determination of atmospheric physical parameters.

At the entrance of the return air well, the atmospheric parameters of each regulation point were measured, the atmospheric pressure was measured with precision pressure water, and the air temperature and humidity were measured with a dry and wet thermometer.

Determination of electromechanical parameters. Test the motor current and voltage power factor rotation axis mild noise.

Condition adjustment and wind measurement

4 ventilation system simulation. The ventilation simulation system 1 automatically displays the test path and position of the measurement points for ventilation resistance, queries the test parameters for each test section, quickly establishes data files, and automatically labels the parameters. 0 Ventilation system 2 Ventilation path simulation, fan simulation, and fan optimization , It can also increase the deletion of the fan; the simulation of the structure can increase the number of structures that can be added to a certain wind path. That is, the air shutter wind bridge closed; network simulation.

3 network solution, can be natural wind or fire wind pressure into the solution, the natural wind; according to the wind wind, according to the algorithm can be divided into channel increase method 1 increase resistance method, road optimization method No fan divides the wind.

The automatic identification of corner air linkage can identify all the corner air linkages in the ventilation network and analyze the sensitivity of each connection to determine the most important wind or ventilation structure affecting the wind volume or airflow direction of a wind point and strengthen the air flow or ventilation. The management of the structure can ensure that the landscape or wind direction of the wind spot does not change.

Automatic drawing of wind grid feature pavilion, automatic drawing of different areas of the wind grid feature color generation; automatic display of any parameters of the color plate, and its value range is divided into arbitrary sections, different sections are distinguished by different colors, and Finally, it is displayed on the standard swatches; all the wind turbines and structures are displayed, and according to the wind volume and the wind in the roadways where they are located, it is determined whether they show that they are in accordance with the features of the wind network to determine the disaster relief route of the mine and provide basis for disaster relief decision-making.

The simulation and simulation of the mine ventilation system in the study and application of the Taiwan Mine optimized the mine ventilation system and the mine ventilation structure, minimized the useless power consumption of the mine ventilation system, and achieved the best match between the main mine ventilator and the mine ventilation system. The reliability of the ventilation system has been improved, and the safety production status of the mine has been improved. In the Datong Coal Mine Group Corporation, many other fan mines are of great value for promotion and application.

Guo Wanzhong, male, born in June 2015, graduated from the Department of Mining Engineering of Chongqing University in July 1988 and is currently working as an engineer at the Datong Coal Mine Group's technology center. Zip code 37003. Telephone 0352 Next page 9 Current Datong Coal Mine Group Corporation Mechanical and Electrical Management Department Deputy Section Chief of the Department of Warehousing. Zip code 037003.

Li Qi, male, born in 1997, graduated from the Department of Mechanical Engineering, Beijing Institute of Chemical Technology in 993, revival date 200212

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