Intrinsically safe mine pressure alarm for mine

Abstract

The invention discloses an intrinsically safe mine pressure alarm for a mine, which comprises a cylindrical joint, wherein one end of the cylindrical joint is opened, and the other end of the cylindrical joint is closed; the opened end of the cylindrical joint is internally sleeved with a valve cylinder; the diameter of the outer wall of the valve cylinder, which is arranged in the cylindrical joint, is less than the inner diameter of the cylindrical joint; the valve cylinder is in thread matching sealing with the cylindrical joint at the opened end of the cylindrical joint; a piston cavity is formed by inner sides of the outer walls of the cylindrical joint and the valve cylinder, which are in matching sealing; a piston is arranged in the valve cylinder; a convex plate which is higher than a piston body is arranged on the piston; a spring is sleeved on one end of the convex plate, which is far away from the cylindrical joint and is close to the opened end of the cylindrical joint; a cylindrical valve cylinder is arranged outside the spring; the other end of the piston is positioned in the piston cavity, and a shaft sleeve is sleeved at the outer part of the piston in a sliding manner; and the shaft sleeve is in external limit and sliding matching with the inner wall of the valve cylinder. The intrinsically safe mine pressure alarm has the advantages of convenience in processing, accuracy in measurement and long service life.

Description

technical field [0001] The invention relates to a hydraulic prop pressure alarm device, in particular to an intrinsically safe mine pressure alarm for mines. Background technique [0002] Mine hydraulic support equipment (including single hydraulic props, suspension brackets and various jacks) is an important equipment to ensure the safety of the current mine working face. Due to the complex underground geological structure, the natural change of mine pressure and the leakage of hydraulic medium, the working resistance (loss and overpressure) of hydraulic support equipment is unbalanced, which is the cause of accidents such as roof loosening, column collapse and overpressure collapse. main source of occurrence. Example: According to the requirements of clause 6.1.7 in the coal industry standard MT / T548-1996 "Specifications for the Use of Single Hydraulic Props": when the diameter of the oil cylinder is Φ80mm, its working resistance is not less than 60KN; when the diameter o...

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Problems solved by technology

[0003] However, the currently widely used hydraulic support products do not have the function of safety detection and alarm for the working resistance, and accidents such as the collapse of the top plate of the inverted column or the collapse of the broken column due to overload often occur due to too small or too large working resistance. Loss of pressure or overpressure of the support equipment will cause the pillar to collapse due to loss of support, or the top beam will collapse due to the uneven distribution of force on multiple monomers or supports, which can easily cause personal injury or death accident and property damage

At present: In order to prevent accidents, underground security personnel adopt the method of frequent inspections of the supporting force of hydraulic equipment (such as single hydraulic props, suspension brackets, etc.), through shaking or knocking and other very backward means Checking the working resistance of the pillars one by one not only cannot find and solve problems in a timely and effective manner, but also wastes a lot of time and energy. It is impossible to know whether the current working status of the hydraulic support equipment is normal, so it is impossible to rule out potential Security risks

[0004] The hydraulic pressure of the mining hydraulic prop is relatively large, and the force on the piston is also relatively large. The large stress needs to be measured with a large spring. In addition, the existing piston adopts a uniform cylindrical shape with a uniform upper and lower sides. The piston must also be used with large springs. The required large-stress springs occupy a large volume, the cost of testing equipment is high, and transportation is inconvenient.

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