CN102901474B - A Mining Drilling Micro-displacement Measuring Instrument - Google Patents

Abstract

A mining drilling micro-displacement measuring instrument, comprising an installation body, a casing, a fixed block, a balance beam sensor, an elastic body and a circuit module, the installation body is a metal plate, and the casing is fixedly arranged at one end of the installation body The fixed block is arranged in the casing and fixedly arranged on the installation body, and the balance beam sensor is arranged in the casing and fixedly arranged on the fixed block; the elastic body is strip-shaped, and one end thereof is fixedly arranged on the balance On the beam sensor, the other end protrudes from the shell; the circuit module is electrically connected to the balance beam sensor, and the circuit module includes an A/D conversion chip, a processor chip, a clock chip, a memory chip, an RS485 chip and a power supply chip.

Description

A Mining Drilling Micro-displacement Measuring Instrument

technical field

The invention relates to an underground displacement measuring device for mines, in particular to a measuring device for measuring the micro-displacement in front of a coal mine working face.

Background technique

In coal mines, the movement of the rock mass around the stope and the existence of high-stress areas in the surrounding rock are the fundamental causes of dynamic disasters such as roof collapse, rock burst, and coal and gas outbursts in coal mines. Therefore, to accurately monitor the distribution of stress (bearing pressure) in the surrounding rock (mainly coal body) in the stope, and to predict the location of high stress concentration areas is the premise of preventing and controlling major dynamic disasters in coal mines.

The research results of mine pressure theory show that the support pressure in the surrounding rock (coal body) after mining will inevitably lead to the approach of the roof and floor and the compression of the coal body. and compression velocity) can infer the peak position of the abutment pressure in the coal body.

The mining micro-displacement measuring instrument mainly uses the above-mentioned principle to arrange boreholes in the coal body in front of the working face, measure the compression amount and compression speed of the coal body in the borehole, and analyze the change law of the bearing pressure distribution in the coal body, especially the pressure peak. It is one of the necessary instruments for coal mine pressure observation to infer and predict the position and provide basic data for the prevention and control of coal mine dynamic disasters.

At present, there is no special instrument at home and abroad to measure the micro-displacement of the coal body in front of the working face. At present, the method that has been used is to preset a mechanical dial indicator in the roadway to measure the displacement of the roof and floor. Due to the comprehensive mechanized coal mining, these measurement points can no longer be arranged in the roadway. It is urgent to adopt new measurement methods and instruments to adapt to the new type of coal mining. Coal process needs.

Contents of the invention

In order to solve the above problems, the present invention proposes a micro-displacement measuring instrument for mine drilling, which includes a mounting body, a housing, a fixed block, a balance beam sensor, an elastic body and a circuit module,

The installation body is a metal plate, and the shell is fixedly arranged at one end of the installation body;

The fixed block is arranged in the casing and fixedly arranged on the installation body, and the balance beam sensor is arranged in the casing and fixedly arranged on the fixed block;

The elastic body is strip-shaped, one end of which is fixed on the balance beam sensor, and the other end extends out of the shell;

The circuit module is electrically connected with the balance beam sensor, and the circuit module includes an A/D conversion chip, a processor chip, a clock chip, a memory chip, an RS485 chip and a power supply chip.

The advantages of the present invention are:

1. It is small in size and can be installed in coal boreholes without being affected by equipment movement and pedestrians in the fully mechanized mining face.

2. Adopt balance beam sensor, high precision, small size, suitable for underground environment;

3. An elastic body is installed on the balance beam sensor. When the coal body is deformed by an external force, it acts on the elastic body, and at the same time transmits the shear force to the balance beam sensor. According to the principle of stress and strain, it can be calculated by circuit processing The magnitude of the force received is proportional to the deformation of the elastic body, and the transformation of the deformation to the force is realized, so that the measurement of the displacement is realized without sliding parts, and at the same time, the balance beam sensor is prevented from being exposed to the harsh environment of the underground. Effectively extend the life of the sensor;

4. The circuit contains 24-bit A/D conversion chip, 16-bit low-power MCU chip, clock chip, large-capacity memory chip, and RS485 chip, which realizes high-precision data collection, calculation, and storage, and can communicate with Data exchange with other devices.

Description of drawings

Accompanying drawing 1 is the outline drawing of micro-displacement measuring instrument of the present invention;

Accompanying drawing 2 is A-A sectional view of accompanying drawing 1.

The reference signs are as follows:

1-balance beam sensor, 2-fixing block, 3-installation body, 4-elastic body, 5-screw, 6-circuit module, 7-housing, 8-dust-proof rubber ring, 9-cable lock fixing block, 10-cable lock head, 11-horizontal section, 12-inclined section, 13-turning section.

Detailed ways

Referring to accompanying drawings 1-2, it describes an embodiment of the micro-displacement measuring instrument of the present invention.

The micro-displacement measuring instrument includes an installation body, a casing, a fixed block, a balance beam sensor, an elastic body, and a circuit module. The installation body is a long strip metal plate, and the casing is basically a cylinder. In the housing and fixed on the installation body, the balance beam sensor is installed in the housing and fixed on the plane of the fixed block. The fixed block provides a convenient installation position for the balance beam sensor and plays a role of shock absorption to avoid vibration damage. Interference and influence on measurement results;

The elastic body is a hard long metal sheet, such as a steel sheet or an alloy sheet, etc., one end of which is fixed on the measuring end of the balance beam sensor, and the other end protrudes out of the shell, and the position protruding from the shell can be installed as a dustproof The rubber ring, preferably the elastic body, is divided into three sections, namely the horizontal section, the inclined section and the turning section. The horizontal section is located in the casing and is fixedly connected to the balance beam sensor. The angle range is 15°～30°, preferably 25°, the turning section is located at the end of the inclined section, and the angle between it and the inclined section is in the range of 90°～115°, preferably 100°, the setting of the above three sections and the distance between them The included angle strengthens the rigidity of the elastic body, which is more suitable for downhole use, and this setting method increases the range of elastic deformation of the elastic body, thereby increasing the measuring range of the measuring instrument;

The circuit module is fixed on the installation body through studs, and it is electrically connected with the balance beam sensor, and is used to detect the measurement results of the sensor and analyze, record and send them. The circuit module can include A/D conversion chips, processor chips, and clock chips. , memory chip, RS485 chip and power chip; in order to facilitate the series and parallel use of multiple measuring instruments and contact with the host computer, the end of the measuring instrument is provided with a cable lock for connecting cables, which is installed on the cable lock fixing block , the cable lock fixing block is directly fixed and installed on the installation body, and the cable lock is electrically connected with the circuit module inside the shell.

The elastic body installed on the balance beam sensor in the measuring instrument deforms when subjected to external force, and transmits the shear force to the balance beam sensor at the same time. According to the principle of stress and strain, the force on the balance beam sensor can be calculated through circuit processing. The magnitude of the force is proportional to the deformation of the elastic body. The circuit module obtains the change value after conversion, and calculates the displacement change.

When the present invention is installed, a hole of predetermined size and length is drilled on the coal body or rock, and one or more mining micro-displacement measuring instruments are sequentially installed in the predetermined position in the borehole, and all micro-displacement measuring instruments in the borehole are collected. data for analysis. All mining micro-displacement measuring instruments in the borehole are connected in parallel, and each mining micro-displacement measuring instrument works independently without interfering with each other. When one or more places in the borehole are deformed by external force, the elastic body of one or more mining micro-displacement measuring instruments in the borehole is first squeezed, and then the corresponding balance beam sensor is forced to deform. When the circuit board A/D conversion module receives the signal, converts and calculates it, obtains the displacement change, and transmits the data to the host computer on the ground through the cable, and the supporting software of the host computer displays and analyzes it in various ways such as charts measured data.

The invention measures the deformation of the coal body through the mining micro-displacement measuring instrument, which can accurately predict the range and position of the peak stress, provide a basis for rationally arranging the roadway and the mining face, and prevent the occurrence of major disasters such as rock bursts, thereby ensuring the safety of the mine. safe production.

The above is only a preferred embodiment of the patent of the present invention, but the scope of protection of the patent of the present invention is not limited thereto. Anyone familiar with the technical field can easily think of All changes or replacements should be covered within the protection scope of the patent for the present invention.

Claims (1)

1. A mine borehole micro-displacement measuring instrument is characterized in that: it comprises an installation body, a shell, a fixed block, a balance beam sensor, an elastic body and a circuit module, The installation body is a metal plate, and the shell is fixedly arranged at one end of the installation body; The fixed block is arranged in the casing and fixedly arranged on the installation body, and the balance beam sensor is arranged in the casing and fixedly arranged on the fixed block; The elastic body is strip-shaped and divided into a horizontal section, an inclined section and a turning section, one end of the elastic body is fixedly arranged on the balance beam sensor, and the other end extends out of the housing; The circuit module is electrically connected with the balance beam sensor, and the circuit module includes an A/D conversion chip, a processor chip, a clock chip, a memory chip, an RS485 chip and a power supply chip.