RU2032077C1 - Method and device for excavation of mine workings - Google Patents

Abstract

FIELD: mining industry. SUBSTANCE: continuous mining machine functions in inert gas medium created by gas-impermeable barrier with labyrinth, secured on the machine. Gas liberated from labyrinth passes through dust-trapping apparatus and is discharged from mine. EFFECT: improved operational and functional characteristics. 4 cl, 6 dwg

Description

 The invention relates to the mining industry and is intended for mechanized mining of tunneling machines in coal mines, dangerous for gas.

 Conducting mining workings by combines is accompanied by sparks, which leads to a decrease in the rotation speed of the cutting crown and the development of high-speed protection with the release of powder flame arresters during registration by flame devices.

 In addition to the probability of ignition of methane, the intensity of the work of combines is also limited by the gas factor, especially when carrying out gas-rich workings.

 The purpose of the invention is the creation of conditions that exclude an accident during intensive operation of the equipment, which will solve the problem of safe and accelerated mining.

 The goal is achieved by creating an inert medium in the zone of mechanical destruction and in the bottom hole.

 There is a method of creating an inert environment in a dead-end mine, which consists in isolating the bottomhole space by constructing a bridge with a labyrinth that overlaps the cross section of the mine, installing in the latter, counting from the bottom, sections of the labyrinth of instrumentation, analyzing the gas composition, displacing the mine atmosphere from the isolated space inert agent and monitoring the process of inertization of the bottomhole by means of a control and measuring device s.

 Designed for drilling and blasting of mine workings, the known method is applicable for mechanized mining of workings by roadheaders.

 Additional actions on material objects are as follows: a jumper with a labyrinth is set to 1 / 3-1 / 2 of its height, forming jumper elements on the sides of a roadheader, and with intensive ventilation of a barred space, the surface layer of coal is removed at a reduced cutting speed, after creating a freshly formed the surface of the harvester is stopped, the flow of fresh jets into the blurred zone is stopped, the construction of the bridge to the production arch is completed, completely isolating the destruction zone from ventilation flows, wait for gas evolution from the freshly formed face and beaten coal until an atmosphere is incapable of burning and exploding in the closed space, excludes the combine in operation with transition to high cutting speeds in the maximum allowable load on the combine, remove gas from the crossed zone gas pipelines are passed through dust collecting devices and removed from the mine.

 A device for conducting mine workings is known, including a roadheader with a rifle-like working body and a regulator for automatically changing the cutting speed according to a given program, a scraper conveyor and a safety shield.

 A device for performing the proposed method for conducting mine workings is characterized in that the sealing jumper is made of corrugated material fixed in the center around the base of the combine boom and plates of elastic materials with elastic plates fixed to them, while one end of the plates of elastic materials are connected with a frame and located around the perimeter of the latter, while others are installed with the possibility of contact with the surface of the arch, walls and soil of the mine.

 The contacts of the bridge and the labyrinth with the working soil and the lower surface of the loading table of the combine, as well as with the bottom of the combine between the tracks, are sealed with pressed elements made of elastic material - foam or foam rubber.

 The scraper conveyor is completely surrounded by a box with cords made of synthetic material (for example, capron) hanging from the inside of the box, periodically irrigated with water, a perforated pipe connected to the water supply mechanism in a pulse-pulsating mode is placed above the cords, the box with a scraper conveyor outside the jumper ends with aspiration a device for suctioning gas and dust into the system of cyclones and other dust collecting devices, from where the gas enters the pipeline that discharges the main part of the gas through the maze the basics of a crowded space.

 The frame with elastic and elastic plates pressed against the arch and the walls of the excavation is held by telescopic stops fixed on the combine.

 A diagram of the method and device is shown in FIG. 1-6, on which the following designations are adopted: 1 - combine harvester, 2 - arrow-shaped executive body, 3 - loading table, 4 - labyrinth, 5 - jumper of corrugated material, 6 - frame, 7 - telescopic stops for mounting the frame, 8 - plates of elastic materials, 9 - scraper conveyor, 10 - box, 11 - cords of synthetic material, 12 - perforated plate on which cords with holes for supplying water are fixed, 13 - perforated tube with longitudinal slots for water supply, 14 - suction shelter, 15 - belt conveyor, 16 - THER plate of fiberglass (see Figure 5..), 17 and 18 - pipelines 19 - gas purifying apparatus from dust.

 Plates 8 and 16 (see Fig. 5), placed around the perimeter of the jumper, can maintain tightness during vibration and vibrations of the whole structure, inevitable during the operation of the combine, due to deformation of the plates 8 and the ability to bend plates 16 longitudinally.

 The jumper design allows telescopic stops to lower the jumper with a convolution of the corrugated central part and laying the upper part of the frame on the combine, freeing up space from the middle to the excavation for ventilation.

 An example of the application of the method. A combine with a partially assembled sealing jumper (do not remove the sealing plates pressed to the working soil and its walls to a height of 0.5-0.8 m), the upper part of the jumper with a convolution of corrugated material lowered is prepared for operation.

 The supply ventilation duct is brought into the face using a well-known “accumulator” of ventilation pipes - a metal-fabric pipe that can compress 10 times. With intensive supply ventilation and with the supply of a cascade of jets and water drops in the destruction zone, the combine is put into operation, uniformly removing a small layer of coal and rock from the face chest.

 After the formation of a freshly exposed surface, the supply ventilation pipe is removed, placing its end outside the jumper, telescopic stops raise the upper part of the jumper, melting the central part of the corrugated material of the jumper and pressing the rows of elastic plates to the surface of the walls and the arch of the mine, and wait for the creation of an inert environment in the closed space, controlling the gas flow coming out of the maze with a sensor for oxygen or methane.

For the conditions of Kuzbass with methane emission of 1.5-2.0 m ³ / min (data refer to the combined digging in the mixed slaughter) in the volume of the crossed zone of 50 m ^{3, a} safe oxygen concentration of 12 vol.% Will be reached after 13-18 min, and after 40 minutes, a 100% oxygen-free methane atmosphere will be created.

 After creating an environment incapable of burning and explosion, the combine is turned on, continuing to operate at the maximum allowable load on the equipment. In forced mode, the work of the combine for the entire duration of the development.

 The gas leaving the labyrinth is sucked out through a system of dust collecting devices with the subsequent removal of dust-free gas outside the mine (if possible, a connection to the degassing system is used).

 Nylon cords hanging in the duct above the scraper conveyor shield the space free of the transported rock mass, creating resistance for gas to escape from the confined space.

 Part of the gas escaping from the duct above the scraper conveyor is sucked off by an aspiration cover with a supply to the gas pipeline and cyclones. To exclude air inflow into the closed space in the latter, a small (up to 50 mm water. Art.) Overpressure is maintained.

 To replace the teeth of the incisor crown and routine inspection of the equipment, the passage of the workers is possible on a stepladder with the telescopic supports lowered on the upper part of the lintel after complete removal of methane by ventilation. The period of re-creation of an inert medium is not long.

 With the methane gas soufflare, the combine can operate without the preliminary formation of a freshly exposed surface - by waiting for an inert medium to be created after the working area has been completely sealed.

 The main advantages of the method and device: improving safety while increasing the speed of workings. Along with the exclusion of gas ignition from sparking, isolated methane removal facilitates gas-rich workings without limiting the rate of penetration through the gas factor. In addition, there is almost no dust in the face before the lintel due to the isolated removal of dusty air from the closed space into the dust collectors and further from the mine.

Claims (4)

 METHOD FOR MINING AND DEVICE FOR ITS IMPLEMENTATION.  1. A method of conducting mine workings in mines hazardous for gas and dust, including installing a gas jumper with a labyrinth before slaughtering, creating an inert gas medium in the bottomhole space with controlling the gas flow leaving the maze, and performing mass destruction and cleaning operations in the face broken rock mass, characterized in that the jumper with the labyrinth is set at 1/3 - 1/2 of its height, forming the jumper elements on the sides of the roadheader, and with intensive ventilation of the crossed space remove the surface layer of coal at a reduced cutting speed, after creating a freshly formed surface, the combine is stopped, the flow of fresh stream to the closed zone is stopped, the bridge is completed to the production arch, completely isolating the destruction zone from ventilation flows, gas is released from the freshly formed bottom face and beaten coal until creating an atmosphere in a confined space, incapable of burning and exploding, include the combine in work with the transition to high cutting speeds in the maximum allowable load on the combine, gas is removed from the blurred zone through gas pipes, passed through dust collecting devices and removed from the mine.  2. A device for mining, including a roadheader with a swept working body and a regulator for automatically changing the cutting speed according to a given program, a scraper conveyor and a safety shield in the form of a bridge, characterized in that the sealing bridge is made of corrugated gas-tight material fixed in the center around the base of the boom of the combine, and plates of elastic materials with elastic plates fixed to them, while one ends of the plates of elastic materials are connected with the frame and are located along the perimeter of the latter, and other ends are installed with the possibility of contact with the surface of the arch, walls and soil of the excavation.  3. The device according to claim 2, characterized in that a box with a plate equipped with holes for water passage is placed above the scraper conveyor, freely hanging cords are fixed on the plate, overlapping the entire free section between the plate and the material being transported, and a perforated parallel to the plate is placed over it a pipe connected to a periodic water supply mechanism.

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