Mining single hydraulic prop manufactured by using welded steel pipes

Abstract

The invention discloses a mining single hydraulic prop manufactured by using welded steel pipes and relates to mining equipment, in particular a hydraulic prop for supporting mine underground tunnels and coal faces. High-frequency welded steel pipes are substituted for hot-rolling or cold-drawing seamless steel pipes to manufacture a cylinder body 5 and a mobile column 3. A manufacturing process of high-frequency welded pipes is the same as that of the common steel pipes basically, but the manufacturing process of high-frequency welded pipes has stricter requirements on the quality selection of plate blanks, the shaping of the welded pipes, a heat treatment method and the like. Each welded steel pipe has the advantages of high strength, high toughness and long service life. After the steel pipes are subjected to annealing, an internal stress at a welded joint is eliminated and phenomena of deformation, cylinder crack and cylinder detonation do not occur, so the safety performance is high. The tolerance of pipe diameter and the deviation of out-of-roundness are less than 0.2 to 0.3 millimeters per 100-millimeter diameter, so the cutting allowance is small and the materials are saved. The cost of each welded pipe is lower than that of the cold-drawing seamless pipe, so the manufacturing cost of the prop is reduced.

Description

technical field [0001] The invention relates to a mining equipment, in particular to a hydraulic prop used for support in coal mine underground roadways and coal mining working faces. Background technique [0002] Hydraulic prop is an important support equipment in coal mines. At present, the widely used suspended single hydraulic prop is widely used in coal mine underground roadways and coal mining due to its advantages of large lifting force, large stroke, tight sealing and long service life. working surface. The main structural parts of the single hydraulic prop are the cylinder body and the live column. At present, the steel pipes used to make the cylinder body and the live column are hot-rolled or cold-drawn seamless steel pipes. The oxide layer on the surface of the hot-rolled seamless pipe is thick, the diameter tolerance and out-of-roundness deviation are large, the cutting allowance is large during processing, and the material waste is serious. The diameter toler...

AI Technical Summary

Problems solved by technology

The oxide layer on the surface of the hot-rolled seamless pipe is thick, the diameter tolerance and out-of-roundness deviation are large, the cutting allowance is large during processing, and the material waste is serious

The diameter tolerance and out-of-roundness tolerance of the cold-drawn seamless pipe are small, and the strength is also improved during the cold-drawing process, but the toughness of the steel pipe is poor; the residual internal stress during the cold-drawing process is large, and the processed cylinder and live column are prone to deformation , cracks, or even a cylinder explosion, seriously affecting underground safety production

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