Double extension suspended type hydraulic vertical prop

Abstract

A double-extension suspended type hydraulic upright column comprises an oil cylinder, a middle cylinder, a plunger, a top cover with an ear plate or hemispherical body at upper end thereof, a pedestal with an ear plate or hemispherical body at lower end thereof, a cylinder sleeve, a column sleeve, a clamping band, a guide ring and a sealing element, wherein the lower part of the plunger is provided inside the middle cylinder, the column sleeve is provided outside the plunger and at the outflow point at the upper end of the middle cylinder; the lower part of the middle cylinder is provided inside the oil cylinder, the cylinder sleeve is provided outside the middle cylinder and at the outflow point at the upper end of the oil cylinder; the clamping band and guide ring are provided outside the lower end of the plunger and middle cylinder, the top cover is provided on the plunger, the oil cylinder is provided in the pedestal, and a liquid inlet / outlet through-hole is provided on the pedestal and communicated with larger variable sealing cavity; a liquid inlet / outlet through-hole is provided on column sleeve and communicated with the middle cylinder; and a liquid inlet / outlet through-hole is provided on the cylinder sleeve and communicated with the oil cylinder. The invention has the advantages of compact and reasonable structure, no welding seam structure, good stability, high strength, large carrying capacity, large working stroke, light weight, good sealing performance, long service life, low cost, wide application range, and good practicability.

Description

technical field [0001] The invention relates to a double-telescopic suspension type hydraulic column, which is especially suitable for the hydraulic support of the comprehensive coal mining mechanized working face in underground coal mines. Background technique [0002] The hydraulic support is one of the essential equipments in the comprehensive coal mining mechanized working face of the coal mine. The hydraulic support used in my country's coal mines can be divided into supporting support, shielding support, supporting shielding support, top coal caving hydraulic support, light hydraulic support, special hydraulic support, etc. according to its different roof support methods and structural characteristics. The hydraulic column is a key component of whether the hydraulic support can safely and effectively support the roof of the working face. The use of hydraulic support has brought great benefits to the safe and efficient mining of coal mining face. At present, the hydrau...

AI Technical Summary

Problems solved by technology

At present, the hydraulic column used on the hydraulic support is mainly composed of the live column and the piston, the oil cylinder and the base. The process is complex, the production is difficult, and the production cost is high. The weld is the weakest link of the hydraulic column of the hydraulic support. For details, see the content of Chapter 4, Section 2 of "Coal Mine Support Manual" published by Coal Industry Press in 1993 and 2006

Therefore, in the long-term field application, the following problems occur: 1) due to the existence of the weld seam structure in the hydraulic column, tiny cracks will be generated at the weld seam during the production process of the weld seam. 2) When the roof of the working face is pressed, the internal pressure of the hydraulic column of the hydraulic support increases, and the inner surface of the oil cylinder will produce a radial displacement to increase the inner diameter of the oil cylinder, resulting in loose seal on the piston , resulting in an internal leak

With the deep mining of coal mines, the frequency of rock burst increases, and the internal leakage and weld failure of the existing hydraulic columns will increase rapidly. That is to say, internal leakage and weld failure are the main safety hazards of the existing hydraulic columns.

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