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Discussion on the lubrication environment in the operation of mine reducer Qin Jian Gao Guokang is resistant to new. Yanzhou Mining Group Integrated Machinery Management Center, Zoucheng 273500, Shandong; 2. Zhangjiakou Coal Mine Machinery Co., Ltd., Zhangjiakou, Hebei, stressed the important role of lubrication environment in the reliability of the life of the reducer.
With the continuous improvement and development of the fully mechanized mining technology level, the performance and reliability of the working face scraper conveyor have also been greatly improved. The mine reducer is a key component of the conveyor. Due to its complicated structure and difficult maintenance, the operational reliability is particularly concerned by people. Mine reducers need to be designed and manufactured to fully guarantee the lubrication environment to achieve their design specifications. The importance of the lubrication environment to ensure the reliable operation of the mine reducer is well known, but it is often overlooked inadvertently due to its wide range of aspects. This paper gives a brief overview of the lubrication environment involved in the operation of the mine reducer.
1 Lubrication environment for mining reducer selection The quality of lubricating oil is of great influence on mine reducer. Choosing the right lubricants is very effective in reducing gear wear and pitting to avoid gluing and lowering the operating temperature of the gear unit.
In order to make a reasonable choice of lubricants, the lubricant should be selected according to the contact pressure of the gear tooth surface in the transmission system. The contact stress of the tooth surface of the mining hardened gear reducer is calculated at 1000 cubits, about 3, and the medium load industrial gear oil should be used. Medium-duty industrial gear oil addition, extreme pressure anti-wear agent anti-rust agent antioxidant, etc. These additives are effective for anti-pitting and anti-gluing and anti-wear.
The viscosity of the lubricating oil is mainly selected according to the pitch line speed and oil temperature of the gear. For the gear unit with better heat dissipation condition, the lubricating oil with lower viscosity is selected. Conversely, for the speed reducer with poor heat dissipation condition, the viscosity is higher. Lubricating oil. Under normal circumstances, you can choose the power of the reducer of the lubricating oil 2001, 220 lubricating oil; by 4, the ding point is slightly lower than the operating point of the 0. 281.31 type ventilator, which is located under the long axis of the equal efficiency curve. However, its efficiency has increased from 82 to 84, especially the increase in wind pressure margin to 591 has increased by 0. The ability of the ventilator to resist external disturbances such as changes in pipe network resistance has been greatly enhanced, and the calculation of the ventilator has been obtained. Secondary success.
In summary, it is recommended that in the future, when selecting a person or a fan, it may be a little lower, so that there is sufficient wind pressure above the working point. It is best not to select 1 for the upper axis of the equal efficiency curve, which can effectively avoid the surge phenomenon caused by the change of the resistance of the ventilation system during the working process.
China University of Mining and Technology, now the Department of Computer Science of Henan Chengjian College is engaged in the teaching and research of electronic and electrical engineering and computer applications, and has published many papers.
Received 1 issue 2001 0227; Du Rongqing, the responsible editor, reduced the density in the absence of the ten, along with the efficiency, 4 select the high-grade viscosity lubricant.
According to the statistics of the use situation, some of the components of the reducer have not reached the design life when the components fail, and the actual working load of the gears and other transmission components does not exceed the design load. After analysis, many of them are caused by excessive wear of the gears or bearings, corrosion damage, etc., and these are related to the abnormal changes in the lubrication environment of the reducer, and are related to the cleanliness of the oil.
Severely contaminated lubricants will cause the speed reducer to die.
In order to create a clean and good operating environment for the reducer, there are some standards or materials available for reference. China has established a cleanliness standard for gear transmissions and divided the cleanliness into several grades; Sweden 51 introduced a pollution degree coefficient in the bearing design theory and proposed a new bearing design formula. According to the new bearing life design theory of 51 company, the bearing life is checked. Under the condition of clean and severe pollution, the bearing life is very different. Under the condition of clean lubrication, the bearing life is much higher than the basic rating life, and under severe pollution conditions, Bearing life is reduced a lot, and oil quality cleanliness has an important impact on bearing life.
Zhuozhu currently does not introduce the cleanliness coefficient of the oil in the gear transmission design, but the design theory has clearly defined the lubrication conditions of the gears. There is a minimum requirement for the environment of the transport hall. Since the oil has a great influence on the life of the transmission device, This requires first creating an environment that is conducive to maintaining clean operation in the design and manufacturing stage, and secondly, through intensive maintenance and management during the use phase to maintain a clean environment. 2 Specific measures to ensure the normal lubrication of the mine reducer (1) Appropriate lubrication Ensure that the gears and bearings are lubricated with mine reducers. The oil is often immersed in a 6-peng-1 to 1 slip. It should be ensured that all transmission gear bearings are lubricated under any installation conditions, and the working inclination does not change much. The oil level can be determined according to the highest position bearing. The oil level is only required to immerse the lower rolling element of the bearing at the highest position in the oil. If the dip angle of the working face changes greatly, the oil filling amount should be determined according to the maximum inclination angle.
The high-speed stage of the mine reducer has the largest heat generation and is difficult to lubricate. It is more difficult to lubricate when the high-speed shaft is in the up-and-down position. At this time, an auxiliary oil pool can be set at the input shaft end to separately fill the oil. A more reliable solution is to set up a forced lubrication pump that supplies oil to the input shaft bearings. The use of this oil supply method not only ensures reliable lubrication of the bearings, but also reduces the oil temperature of the input shaft by circulation.
Among the various types of mine reducers, the planetary reducer is more favorable than the lubrication condition of the reducer.
Although the high-power mine reducer has high efficiency, the heat generation is still large. If there is no reliable cooling device, the oil temperature will rise, the viscosity of the lubricating oil will drop, and the oil film will be difficult to form, causing the transmission parts to be placed. At present, there are many types of coolers, and there are straight tube type and exterior type according to the structure. Among them, the performance of the finned tube externally mounted cooler is superior. The finned tube externally mounted cooler is a metal heat sink with a special process densely wrapped around the outside of the copper tube, or a non-ferrous metal heat sink set on the outside of the copper tube. The piece, the cooler and the quick-change pipe joint are combined into a whole structure, and the bolt is fixedly connected with the reducer case body, and the disassembly and assembly is very convenient. Excellent results due to the excellent thermal conductivity. The finned tube externally mounted cooler has a pressure bearing capacity of more than 3 MPa, and is often suitable for a working environment with a large water supply pressure in a coal mine working face.
The measures to ensure the cleanliness of the oil affect the cleanliness of the oil. There are roughly the following aspects: solid impurities such as metal sand that remain in the manufacturing process due to cleaning and feeding; the oil injection is improper, the oil is mixed with impurities; The metal particles generated by the running of the machine; 4 The oil reducer caused by the failure of the seal reducer, in order to ensure the quality of the oil, the cabinet and all parts must be carefully cleaned when installing the repair reducer; It should be replaced regularly. For the first run-in operation, the oil change cycle of the reducer must be replaced in advance according to the instruction manual. When filling the oil, the oil injection port should be cleaned to ensure that the oil is cleaned for one week and injected through the filter; the reducer is installed with magnetic oil plug. And regularly clear, magnetic steel is absorbed by the ferromagnetic powder. This has the benefit of the life of the reducer. During the operation of the reducer, the oil sample should be inspected regularly. If the impurity content exceeds the standard, the lubricant should be replaced in advance.
Can choose. The excellent seal structure guarantees reliable isolation of the inner cavity of the reducer from the surrounding environment, thus ensuring the cleanliness of the oil, which is the key to ensure long-term stable operation of the reducer. For mine gearboxes operating under harsh conditions, a reliable sealing structure should be used.
About coal mine underground transportation accidents and countermeasures Zeng Wenfeng Hongjiashan Mining Company Tongyuping Coal Mine, Longyan 364014, Fujian, corresponding safety technical precautions to prevent mine transportation accidents.
According to statistics, mine transportation accidents in China's coal mines account for about 18 of the total number of mine accidents. Therefore, it is very meaningful to try to reduce mine transportation accidents. It is true that the cause of the transportation accident occurred in the mine. Now, the countermeasures for reducing transportation accidents are discussed in terms of both the inclined shaft and the peaceful lane transportation.
1 Inclined wells are used to raise the upper yard of the inclined shaft. When conditions permit, it is recommended to use the parking lot. As far as possible, the accident rate of the parking lot is lower than that of the parking lot. The disadvantage is that there must be a car stop at the slope change point. Otherwise, it is easy to cause a sports car or rope break accident; because of the wire rope in the lifting process, the ground roller track, and even the heart-point track running contact mechanism The wear is large, and sometimes there is a serious sawing phenomenon, which will shorten the use of the wire rope and shorten the use of the wire rope; the good class requires 2 people, and the parking lot only needs 1 person. Therefore, it is best to use the brake yard in the upper yard of the inclined shaft. If the height of the input shaft of the mine reducer is high, it is the highest working temperature of the reducer. The sealing part of the input shaft with high temperature resistance such as fluororubber should be used. 1 and the processing quality is high, the output shaft speed of the mine reducer is low, but the shaft diameter is large, and the working condition is ambiguous, except for the small-speed reducer that allows the skeleton oil to be used. All of the human power mine reducers use floating oil seals. The floating oil seal belongs to the end face. The floating seal ring is made of high hardness and wear-resistant material. The elastic support of the 0-ring makes the floating seal ring in the follow-up state and maintains good sealing performance. The life of the floating oil seal is more appropriate than that of the skeleton type. The Asahi Field 4 is rolled by + ground, as long as several vertical rolls are installed at the horizontal horizontal field, which can greatly improve the wire rope as a wire rope for the inclined shaft lifting. The size of the coefficient is directly related to the safety and reliability of the inclined well. When selecting a wire rope, people usually break the total breaking force of the rope and the wire it receives; during the tanning process. The Kegen wire is subjected to bending and twisting.æ» æ» æ» å…€ 当 当 当 当 当 当 当 当 当 æ¯ æ¯ æ¯ æ¯ æ¯ æ¯ æ¯ æ¯ æ¯ æ¯ æ¯ æ¯ æ¯ æ¯ æ¯ æ¯ æ¯ æ¯ æ¯ æ¯ æ¯ æ¯ æ¯ æ¯ æ¯ æ¯ æ¯ æ¯ æ¯ æ¯ æ¯ æ¯ æ¯ æ¯ æ¯ æ¯ æ¯ æ¯ æ¯ æ¯ æ¯Static like; 1 condition to choose the diameter of the wire rope, or to put the wire rope 1 to the human level to choose this is beneficial to extend the service life of the wire rope.
The oil seal has a long life.
Maintenance of the long-term deactivated gearbox The mine reducer that has been deactivated for a long time should be sealed after inspection. The lubricating oil of the specified grade should be injected into the reducer. The oil level is based on the lower rolling element of the submerged bearing; the input shaft output shaft of the reducer The grease is lost; in the subsequent maintenance, the input shaft should be rotated periodically for one month to make the gear bearing working surface glued to prevent the gear bearing surface from rusting.
The machine management center is engaged in equipment management.
1.Used in shoveling ,stacking or short-distance transportation of loose material like mud,sand stone or garbage
2.Hydraulic transmission is used,featured with compact structure,flexibility ,convenient operation and quick mounting and dismounting.It uses hydraulic oil commonly with Tractor .The hydraulic elements are standardized ,convenient for operation and service.