Because the single hydraulic prop in the leakage of the high and low sealing surface, the operator can not find, the prop is often so automatically inverted, resulting in the collapse of the roof injury accident. Small make up to take you to understand some problems in the use of single hydraulic prop, find the cause of the problem, in order to solve the problem. Following small make up to go.
Using piston technology principle, the inner surface of piston and oil cylinder is high pressure sealing surface, so there are the following problems:
(1) the prop after reaching working resistance, are generally of cavity pressure above 35 ~ 40 MPa, for such a big fluid pressure, oil cylinder in radial can produce elastic expansion, while the elastic expansion volume is small, but for the piston and cylinder of high pressure sealing surface is very important, especially for use after a year or two of the props, oil cylinder elastic recovery ability decline after fatigue. The high pressure seal performance is greatly reduced when the support continues to be used.
2) mu in the high pressure sealed through the oil lock, the prop of the high and low sealing surface leakage, the operation T people can not find, the prop of the party so automatically inverted, resulting in the collapse of the roof injury accident. Therefore, if the next generation of the prop item testing new work, both time-consuming and more expensive.
It is difficult to add, and the repair is more difficult. The repair volume of the urine prop is not surprising. Therefore, the repair of the 1 body support caused a large limit. In terms of the structural characteristics, welding a stigma for three-use valve in the head or middle of the live column presents the following problems
(1) it is difficult to guarantee the circular arc welding technology and weld strength of this cylinder, which often causes leakage or leakage at the weld during use, making the prop unable to work.
(2) fracture or bending at the welding seam, resulting in the casualty accident of roof caving, which brings great danger to human safety.
(3) the circular arc welding seam is of wood height and waste product density is also high.
The three valves follow the factory, and the hands of the operators must also be on. As for the relatively early working water in the coal seam, it is very difficult and dangerous for two people to operate.
(5) as the cylinder head is welded in the live column L, the working stroke of the prop is small. For medium thick and thin coal seams, especially for the coal seams with more roof subsidence, dead column phenomenon is often caused and can not be recovered, resulting in great waste. In the aspect of working medium, emulsion is used, which causes the pollution of working environment and water in coal mine, and affects the quality of domestic water in mining area.
Problems with external and internal contactor hydraulic support
In technical principle. There are live match type, screw hydraulic and screw silicone oil type branch village, there are four in the beginning of the uneven support force and other problems caused by the back work again roof convex four uneven, and affect the safety of production. We, Shandong China Coal Group single hydraulic prop factory, sell you the single hydraulic prop at ex-factory price. Our Shandong China Coal Group's products are our constant pursuit! Do mechanical products is the constant pursuit of China coal, we have a professional team and technology, excellent service and quality. The same quality depends on the price, the same price depends on the quality. Give you satisfactory price, let you feel intimate service, use excellent products.
