SU1608353A1 - Device for monitoring dust- and explosion-safety of mine working - Google Patents

Abstract

The invention relates to the mining industry and can be used in assessing the dust and explosion safety of mine workings (HS). The goal is to increase the accuracy and speed of control. The explosion safety of humic substances depends on the mass of coal dust deposited on the surface of the excavation over inert (shale) dust. This device makes it possible to determine the content of coal dust by the change in the reflectivity of the controlled surface of humic substances. The device consists of a measuring probe 2 of cylindrical shape and an electronic unit. The front end of the probe 2, facing the controlled surface of the HS, is made open. In the center of the inner end wall 3 of the probe, an optical radiation receiver (POI) 4 is installed. Around the POI there are at least three optical radiation sources 5 around the circumference. Here, the distance between the inner end wall 3 and the front end portion of the probe 2 is at least 100 mm. The electronic unit consists of a power supply 8 and series-connected amplifier 6 and an indication unit 7 connected to the POI 4. To eliminate the influence of extraneous light sources, the radiation of the sources can be modulated followed by the POI 4 signal demodulation. Probe 2 is applied with an open end to the controlled surface HW . The radiation flux from source 5 hits the monitored surface and is reflected from it. The reflected part illuminates the POI 4 input window, which produces a signal proportional to the surface density of the settled coal dust. This signal is amplified by amplifier 6 and is fed to display unit 7. 1 hp ff., 1 ill.

Description

The invention relates to the mining industry and can be used in evaluating the dust and explosion safety of mine workings.

The explosiveness of the workings depends on the mass of coal dust deposited on the surface of the excavation over inert (shale) dust. At the same time, monitoring the content of coal dust by changing the reflectivity of the studied surface of the mine allows unambiguously to control the explosion safety of mine.

The purpose of the invention is to improve the accuracy and efficiency of control.

The drawing shows schematically a device for controlling dust and explosion safety of mine workings.

The device consists of a housing 1, in one part of which a measuring probe 2 of cylindrical shape is placed, one of the end sides of which is open, and on the opposite end wall 3 an optical radiation receiver 4 is installed on the inner side in the center, around which circumferentially symmetrically arranged emitters 5 optical flow. In the second part of the device case there is an electronic unit consisting of the amplifier 6 of the receiver signal, the display unit 7 and the power supply 8.

The device works as follows.

In a mine work with flaking walls, the device is attached to a controlled surface area with an open end portion of a cylindrical measuring probe. The emitters 5 are turned on. The radiation flux falls on a controlled undisturbed surface consisting of coal particles 9 and shale dust 10, is reflected from it, and the reflected part illuminates the input window of the receiver 4. The signal generated in it (proportional to the surface density of the precipitated coal dust) is amplified by an amplifier 6 and enters the display unit 7.

Example. The device for monitoring the dust-and-explosion safety of mine workings structurally consists of a measuring probe and an electronic unit combined in one case with a handle. A radiation receiver (for example, a photodiode) is installed inside the probe body, in the center of its end surface made of ebonite, and three emitters (for example, LEDs) are arranged symmetrically around the circumference of a diameter of 16 mm. The length of the measuring probe is 100 mm, the inner diameter is 93 mm, and the inner walls of the body of the measuring probe are covered in black.

The electronic unit consists of a board and a power source 8 located inside the second part of the main body of the device, as well as a false panel covering the end of the cylindrical main body opposite to the open input end. The board contains a power supply voltage regulator, an LED power modulation generator, a demodulator (not shown), as well as an amplifier 6; control panels and adjustments are located on the false panel: zero setting potentiometers (“Set O”), electric zero setting (“ Install the power supply micro-switch (ON). The measurement toggle button (“Measurement”) is located on the device handle in the form of a trigger.

 A power conditioner ensures the normal operation of the device when designing a power source (battery) within acceptable limits. To eliminate the effect on pa.,. The external lighting source device (stationary and individual luminaires) are powered and, therefore, emitted by LEDs, are modulated with a master oscillator. The latter can be performed on a typical micro5 scheme. The signal from the photodiode is amplified, demodulated and fed to the display unit 7, which can be made in the form of a microammeter or threshold devices with display LEDs.

Before working in the mine workings at a particular coal mine, the lower explosive limit of the deposited coal dust, d g / m, is established.

The device in working out follows

without mechanical violation of its structure. Comparative measurements carried out in laboratory and in-situ conditions show that the control of dust-and-explosion safety using the proposed

Claims (2)

1. A device for monitoring the dust and explosion safety of mine workings, containing a cylindrical measuring probe with a source and receiver of optical radiation, as well as an electronic unit for determining the intensity of a beam reflected shm way Turning on the device power supply ensures a reduction by the “On” switch. Set the measurement electrical errors from 50 to 7%. Instrument zero with potentiometer “Set. email A. Put the input window of the device to the surface of inert dust, which is produced in this development by smearing, press the "Measurement" toggle switch and, if necessary, the "Sett. About achieve installation of a zero measuring scale of the device. After that, the device is ready for operation. Control of the dust-and-explosion safety of the mountain-15 from the surface of the mine workings, including workings, is made by applying a power source and the connected input window to the controlled surface to the optical radiation receiver on the road wall, pressing the successively connected amplifier and toggle switch "Measurement (trigger on handle indication, characterized in that, for the purpose of the device) and by reading, when JJ increases, the accuracy and efficiency of the counter, graduated to the value of control, the front face portion At the probe, the surface density of the coal dust, g / m is expanded to the test surface. When the amount of settled dusting is reached, the open source is made, and the source and the receiver of optical radiation are illuminated at a dangerous level. This improves the reliability, efficiency and convenience of the con-25 probe, remote from the front face of the dangerous dust level, for a distance of at least 100 mm, mounted on the inner end wall. 2. The device according to claim 1, characterized by the fact that the optical radiation receiver is installed in the center of the internal end Compared with the known, the proposed device improves the accuracy and efficiency of control, which is achieved by a new design of the measuring probe, allowing the box, while the optical sources monitor the deposits of coal dust radiation placed around the receiver on the shaded surface of the circle in an amount of not less than three. without mechanical violation of its structure. Comparative measurements carried out in laboratory and in-situ conditions show that the control of dust-and-explosion safety using the proposed Invention Formula 1. A device for monitoring the dust and explosion safety of mine workings, containing a cylindrical measuring probe with a source and receiver of optical radiation, as well as an electronic unit for determining the intensity of a beam reflected The device provides a reduction in the measurement error from 50 to 7%. from the surface of the mine working, including the power source and connected to the optical receiver, a sequentially connected amplifier and display unit, characterized in that, in order to increase the accuracy and efficiency of the control, the front end part of the probe is turned to the working surface is open, and the source and receiver of optical radiation are mounted on the inner end wall of the probe, which is at least 100 mm away from the front end part.