Larger, increased maintenance, seriously hindered the normal production.
1 The structure and working principle of the valve component The valve is the throat of the compressor and is used to control the suction and exhaust. The valve component is composed of a seat lift limiter and a valve spring, and is screwed. The bolt is joined to the body, and the structure is 1.
Before the experience 3 effect transformation, mention 1 bucket coal 2.5, with a time of 15, the annual lifting capacity is only about 150,000 less than the design annual output of 210,000, after the upgrade, the number of buckets used for the bucket is 58, the annual lifting capacity is about 500,000. 3.3 times, can meet the mine design capability.
After the transformation of the loading system, due to the addition of a 150 1 coal bunker, the air cannon was added, and no manual treatment of the wet coal plugging of the coal sluice was required. The automatic coal loading was realized, and the labor intensity was reduced.
4 Conclusion Through the comprehensive upgrade of the main bottom loading system of Laojuntang Coal Mine, the main well has been upgraded to achieve automatic loading, the loading efficiency has been greatly improved, and a good working environment has been created for the workers, and the safety conditions have been greatly improved. The success of this transformation mode is a good solution for the quantitative loading of the small roof water when the water is large. The date of the 2010210 piston air compressor valve modification Li Honglu Zou Shuping Pang Zhitao Yu Xing Mine Administration Anhui Development and Mining Co., Ltd. Anhui Huoqiu 263427 Anhui Development Mining Co., Ltd. currently uses the 32204 type 20, oil-free piston air compressor, which mainly provides power support for the company's 5 million engineering downhole ramp. Due to the existence of some air compressors in the equipment itself, the valve spring wear and breakage frequently occur in the use, resulting in frequent valve replacement, spare parts consume spring guide holes 1. Seat 2. Lift limiter 3. Spring 4. When the valve is working, the piece is pressed against the sealing surface of the valve seat by the evenly distributed spring, and automatically opens and closes by the air pressure difference between the inside and outside of the valve during operation, thereby completing the suction and exhaust. Whether the spring works normally or not directly affects the flexibility of the valve lift, which affects the smooth completion of the steaming process of the press machine.
2 The analytical lift limiter is in direct contact with the valve spring without a lubricant film separating it. The lift limiter and the valve spring work directly in the high temperature environment of 120160, and the friction frequency is higher. The gas valve opens and closes about 1000 ton per minute, and the spring wears seriously, resulting in fracture failure.
3 Reconstruction plan According to the structural principle and existing problems of the gas valve, two kinds of transformation schemes have been developed and tested, and the spring guide holes are enlarged, and the oil-containing nylon bushing is added; this changes the material of the spring from the original 65 to 50. The spring surface is vulcanized or phosphatized. Although these two kinds of transformation schemes have certain effects, they are all complicated, and the friction between the spring and the valve seat still exists, and the service life of the spring cannot be completely guaranteed. To this end, it is decided to change the shape of the spring, and replace the original cylindrical spring with a tower spring. The material is unchanged, so that the spring has no contact with the inner surface of the spring guide hole of the lift limiter, and the diameter of the cross section of the spring is appropriately increased to ensure the function of the spring. The flexibility of the force and valve opening and closing meets the intake and exhaust functions of the valve.
After the modification, the instantaneous force of the valve piece falling to the valve seat during the closing process is small, and the impact of the valve piece on the valve seat is reduced. On the other hand, when the valve plate is fully open, the impact of the valve plate on the lift limiter is reduced, and the valve plate is closed in time. This retrofit method does not require the processing of the air valve, and the tower spring can be purchased directly from the market. There is no rubbing column editor Li Wenmin between the modified spring and the lift limiter guide hole to ensure the service life of the spring.
4 Conclusion After more than a year of running proof, the transformation effect is very satisfactory. Before the transformation, the gas valve is basically 5 to be repaired and replaced. After the transformation, there is no failure of the spring wear failure, which not only reduces the cost, but also ensures the continuity of production. The selection of high-concentration conveying equipment for the tailings of the East Tower of the East Tower, Tiancheng Chuntong Group, Dunhua Tadong Mining Company, Jilin Dunhua 133700 East Iron Mine designed and processed 5 million original ore, with an ore grade of 22.37, the main product is iron concentrate 10,000. The sulfur concentrate is 290,13, and the phosphate concentrate is a large-scale iron ore mine with typical low-grade polymetallic comprehensive recycling in China. The main beneficiation process is a closed-circuit grinding section and a flotation magnetic separation flotation process.
1 Necessity of selecting high-concentration conveying equipment for tailings Due to the low selection ratio of ore grades mined in the mining area, the annual tailings of dry ore is 2.34 million, and the conveying distance is about 5.52. If ordinary slurry pump is used for transportation, tailings are used. The concentration is 15 2, the volume of the slurry is very large, and the multi-stage pumping station relay is required to send the slurry to the tailings dam, which consumes a large amount of electrical energy and equipment spare parts every year. The mine is a typical water-deficient area, and the use of tailings backwater is very important. Therefore, it is necessary to select a suitable high-concentration conveying equipment.
2 Analytical calculations To achieve high concentration of tailings, the tailings must be concentrated. The mine commissioned the Department of Water Resources and Hydropower of Tsinghua University to conduct tailings concentration test and pipeline transportation test.
2.1 Concentration test In order to reduce the tailings transportation cost and ensure the quality of the thickener overflow water, the thickener underflow concentration requirement reaches 4550; the overflow water discharged from the thickener is pumped to the production pool, and the underflow slurry is pumped to the tailings pond. Among them, the concentration test carried out the test of the physical properties of the ore sample, the flocculant class preferred test, the slurry concentration and the flocculant dosage optimization test, the tailings letterhead two æ£ treatment target, the Pa 2 饬 Kang take, passed the test ore sample The analysis found that the median diameter of the mine tailings was 0,06 mm, the average particle size of the force mouth was 0,0983 mm = 0.152, and the fine particles of 325 mesh accounted for less than 40.0, indicating that the particle size was relatively coarse.
According to the concentration condition, the flocculation agent sedimentation test is carried out. The sedimentation time of the slurry in the concentration tank is 3.63, the bottom compression concentration can reach above 45, and the upper layer clarified water suspension particle content is below. It is proved that the clarified water meets the production after the tailings are treated by the concentration process. It is required that the concentration of the slurry reaches 45 or above, and the concentration and concentration of the high-concentration conveying equipment are required.
2.2 The distance from the tailings pipeline to the tailings pond is 5.35.5km, the annual operating rate is calculated according to 3304, and the concentration of Yu is 45. After calculation, the pipeline with inner diameter of 300mm can meet the requirements, in concentration and transportation volume. There will be no siltation when there is a certain fluctuation.
2.3 The pump's head is thicker at the bottom of the concentrating machine with an elevation of 585m, the starting point of the pipeline is 596 meg, the end point is 489 meg, the highest point is 625 melon. Pipeline pressure transmission, after the highest point, can flow to the tailings now, under normal conditions, the pump head only needs 60 melons, the delivery volume is about 457. 3. The selection of tailings conveying equipment is currently long-distance transportation of domestic high concentration tailings. The equipment is mainly oil diaphragm pump and water isolation pump. These two pumps have a long transmission distance, a high lift, and a large concentration of transported slurry, which is suitable for long-distance and high-concentration transport of tailings. The tailings can be sent to the tailings dam with a Class 1 pumping station, reducing the number of equipment and facilities. The oil diaphragm pump has a complicated structure, high price of the whole machine and spare parts, and is difficult to maintain; the water isolation pump has a simple structure, the spare parts are cheap, the wearing parts are small, the whole machine is low in cost, and the maintenance amount and difficulty are also small. From the selection plant to the tailings pond, the distance is about 5.52. In the whole transportation route, the uphill section is short and the downhill section is long, which is more suitable for water isolation pump.
4 Conclusion After the test and program comparison, Tadong Iron Mine decided to use water isolation pump to achieve high concentration of tailings. The water isolation pump is automatically controlled by the microcomputer, with less staffing, high degree of automation and simple operation. It has its own advantages in the high concentration delivery of tailings. Compared with the oil diaphragm pump, the water-isolated pump can save about 360,000 yuan. Compared with the slurry pump, it can reduce the salary of the post-care staff and reduce the investment of the pumping station and other facilities by 320,000 yuan per year. The high-concentration transportation reduces the return amount of circulating water by 5.59 million years and saves electricity costs of 3.09 million yuan. Editor-in-Chief of Li Wenmin
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