Coal bunker liner for the application of ultra-high molecular weight polyethylene in coal mines
Ultra-high molecular weight polyethylene (UHMWPE) is a kind of thermoplastic engineering plastics with excellent comprehensive properties. The material has extremely high wear resistance, impact resistance, very low friction coefficient and self-lubricating properties, as well as excellent low temperature resistance, corrosion resistance and anti-static properties. These excellent properties make it in some aspects much more than all the engineering plastics and some metal materials, increasingly by people's attention, in paper making, food and beverage, mining, transportation, ceramics, machinery, textile, water conservancy and electric power and other fields and geotechnical engineering construction have a wide range of application prospects. Abroad, Germany, the United States, Japan, Europe and other developed countries and regions have been widely used in the above fields. In China, modified materials have gradually entered the fields of coal mines, coal washing plants, power plants and other industries, and increasingly show its important role.
At present, China's coal mines, power plants, port storage coal bunker is essentially with concrete pouring and become, the surface is not smooth, friction factor is big, high water absorption, it is often the main cause of bonding and blocking positions, especially in soft coal mining, coal, water under the condition of big, plugging warehouse accident is particularly serious, there are two common forms of coal bunker NianDu. One is the wet pulverized coal now bonded on the warehouse wall, layer by layer superimposed together, after the formation of a similar rat hole shape in the cabin, and then coal will cause blockage; The other is due to the large internal friction resistance between the wet pulverized coal block, and the external friction resistance between him and the warehouse wall is also large, when the coal bunker is full of coal, the lower coal exit mouth formation similar to stuck and rust dead arch (bridge) shape. When breaking coal can only put down the little part of the upper coal is blocked by arch of warehouse, for many years in order to solve the problem of NianDu, people also think of many ways, such as the warehouse wall shop sticks ceramic tile, steel plates, with air gun or electric hammer strike, has failed to solve completely, and artificial tong coal often causing the personal casualty.
Therefore, we have carried out a lot of investigation and test, decided to use UHMWPE sheet as the coal bunker lining, using the nail to fix the large plate material on the wall of the bunker, so as to completely solve the problem of bunker bonding and blocking. It reduces the production interruption and the storeroom jamming accident caused by silo blocking, reduces the crushing rate of silo, solves the clearance cost, greatly shortens the loading time and reduces the labor intensity of workers.
