Wide-range roof-to-floor convergence tester and application method thereof

Abstract

The invention discloses a wide-range roof-to-floor convergence tester and an application method thereof and aims to solve the problem in roof-to-floor convergence measurement of an existing coal minetunnel. The wide-range roof-to-floor convergence tester comprises a convergence test module, a water spraying and dust removal module and a fixed connection module, wherein the fixed connection moduleis used for integrating the convergence test module and the water spraying and dust removal module in a dustproof shell and fixing the whole instrument between roof and floor of the tunnel. The roof-to-floor convergence of the tunnel is recorded by relative moving of a tooth-shaped groove rod and a gear displacement meter, the tooth-shaped groove rod is deepen into a roof drilling protection pipeand is large in test range, the tooth-shaped groove rod is periodically cleaned by the special water spraying and dust removal model, a displacement test module is enabled not to be invaded with coaldust, and meanwhile, the wide-range roof-to-floor convergence tester is compatible with functions of convergence early warning and collision-prevention warning. The wide-range roof-to-floor convergence tester is suitable for long-term observation of roof-to-floor convergence of the coal mine tunnel and has the advantages of large range, test accuracy, high site applicability and the like, and thetest accuracy and instrument safety are ensured.

Description

technical field [0001] The invention relates to the field of coal mines, in particular to a large-range roof and floor approach measurement instrument and a method for using the same. Background technique [0002] With the increase of coal mining depth, under the influence of high ground stress, roadway deformation is serious and difficult to support. In order to control the deformation of the surrounding rock and ensure production safety, it is necessary to measure the deformation of the top and bottom plates of the roadway to grasp its deformation characteristics. [0003] At present, the means of measuring the deformation characteristics of the roof and floor of the roadway mainly include the manual measurement of the convergence meter, the measurement of the laser range finder, and the measurement of the roof and floor dynamic instrument. Among them, the manual measurement of the convergence meter requires the measurement personnel to go down the well repeatedly, the wo...

AI Technical Summary

Problems solved by technology

[0004] There are following problems in the existing top and bottom plate approach measurement instruments: firstly, the deformation measuring rod is supported by a spring, and when the deformation measuring rod is pressed into the measuring device in the process of surrounding rock, the deformation space of the spring becomes smaller and smaller; secondly , at present, the measuring range of the roof and bottom plate approach measurement instrument is limited, generally 300-400mm. After the upper limit of the measurement is reached, the deformation pressure of the roof and the bottom plate will break the deformation measuring rod and cause the instrument to fail. Large and dusty, it is easy to adhere to the surface of the deformation measuring rod, and most of the deformation measuring rods are displaced and deformed downwards. If it is not cleaned in time, it is easy to be brought into the measuring device by the deformation measuring rod, causing measurement errors

Finally, the commonly used roof and floor approach measurement instrument does not have any fixing measures for the instrument on the roadway floor. The roadway floor is deformed to bulge upwards, and the surrounding rock of the floor is cracked and soft. Under the condition of water in the roadway, the bottom plate is not attached stably. instrument skew

In addition, the roadway is used as a transportation channel for personnel and materials. When the top and bottom plates are moved closer to the measuring instrument, it is inevitable that it will be touched by pedestrians and materials, resulting in inaccurate data collection and even damage to the equipment.

[0005] Prior to the present invention, the invention with the application number 2017106954708 announced an integrated device and method for monitoring the deformation of the roof and floor of the goaf and the stress of the filling body, which consists of a measuring rod and a displacement sensor with a rated floor displacement attached to the measuring rod , the measuring rod is composed of an upper rod body, a middle connecting rod and a lower rod body in turn. Since it is composed of a suit, the rods slide relative to each other through the guides, and the relative displacement between the rods is limited. When the roof sinks violently , when the sinking amount exceeds the length of its upper rod body, the device will not be able to deform further, making it impossible to measure subsequent deformation

[0006] The invention with the application number of 2017113942315 provides a sliding type top and bottom plate approach measurement device and a top and bottom plate approach measurement method. The absolute displacement changes of the top plate and the bottom plate are respectively measured by setting piston rods at both ends, but the piston The rod and the piston rod sleeve slide relative to each other. By reading the scale, the respective moving distances of the top and bottom plates are tested, but the length of the piston rod sleeve sleeve is limited. Calculated by the maximum ratio, the displacement is only half of the height of the roadway, exceeding the height of the roadway. When the height is half, it reaches the upper limit of its measuring range, and this invention is exposed to the coal dust environment of the roadway, and the piston rod sleeve is easily attached by coal dust, resulting in slippage obstruction and scale contamination, thus affecting the test results

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