SU960434A1 - Apparatus for monitoring a rock-silvinite interface - Google Patents

Description

The invention relates to the mining industry, in particular, to devices for automatically controlling the position of burning machines, in particular in the selective development of a suite of closely spaced flat-falling potash reservoirs.

A device for controlling the interface of the reservoir is known, which contains photoelectric sensors and operates on the principle of recognizing granules of the faction section by color and contrast of the rock interlayers 1.

However, this device is not suitable for controlling the boundary of sylvinite rock due to the fact that the color and contrast of potash ores and quiescent rocks may not differ

It is also known a device for controlling the sylvinite – rock boundary during the selective excavation of potash ores with the aid of an aggregate comprising an actuator in the form of a milling cutter and breaker drums containing electrodes, a sensing element connected to a high-frequency AC source, and a recording unit C2.

However, this device does not allow (it is possible to accurately and reliably determine the boundary of the sylvinite - rock

it does not take into account the specifics / characteristics of the penetration and the form of mine workings when working out the retinue of contiguous layers with units of vertical action and, oco6eHHq is important, in conditions of unmanned excavation. In this device, the design of the sensing element, made in the form of a compact electrode capacitor sensor embedded in the cutter of the executive body of the excavation machine, does not ensure its stable contact with the rocks due to the change in cutting mode (feed rate, rotation of the actuator organ, rock hardness, etc.), which ultimately leads to a distortion of the resulting in-. Forms The small area of contact between the sensor and the rocks and the rotation of the cutter with the sensor on the actuator gives only periodic (cyclic) information on a narrow area. Removal of reliable information from rotating

25 of the executive body in the mine level of ov x is very difficult. It also does not take into account the specifics of salt deposits, which require increased wear resistance and corrosion resistance of the electrodes. The aim of the invention is to increase the accuracy and reliability of the control of the sylvinite-rock boundary during the extraction of potash ores by mining units of vertical action, especially when it is deserted. The goal is achieved by the fact that the device is equipped with a delay unit and a second sensing element, each of the sensing elements being made in the form of three electrically connected electrodes using an elastic insulator of electrodes, v composed of separate spring-loaded parts, which have a hingedly transverse profile Krivi3, corresponding to the configuration of the cutter of the executive body of the unit, and the length of the electrodes is chosen equal to 0.8-1.2 diameters of the breakers of the executive body, and perceived Connecting elements are diametrically opposed to the unit housing. Fig. 1 shows the construction of three-electrode sensing elements and their installation on the housing of the unit; 2 - one of the electrodes of the sensing element, the cross section .. On the housing of the main gearbox 1 of the unit (Fig.1) two sensing elements 2 and 3 are fixed, the sensing element 3 (or. 21 is made in the form of three electrodes 4, which The elastic insulator 5 is connected in a movable manner. The cross-sectional profile of the electrodes 4 has a curvature corresponding to the configuration of the annular part of the split slit b formed by the cutter of the executive body of the unit. The KEY electrode (Fig. 2) is made up of individual spring-loaded parts 7, the connection hinges 8. Each part 7 of the electrode is spring-loaded to lateral rocks by springs 9 placed between the insulating base (body) 10 and elastic insulator toro 5, for example made of rubber. The necessary force of parts of the electrodes is applied by tensioning the cable 11 by rotating (twisting) the nuts 12 and 13. The supply of high-frequency voltage to the electrodes is carried out via cable 14, rod 15 and cable 11, the length of electrodes 4 is chosen equal to 0.8-1.2 diameters of the fender drums 16 of the actuator. In terms of the selected ratio of the electrode sizes and the diameter of the reel drums, it should be noted that if the electrodes are equal in length and the diameter of the end drums, the extracted mineral is diluted due to the incision of the end drums into the enclosing hollow rocks of the roof or soil, as electronic (by threshold ) should work only when the electrodes exit to down: -. Rocks (for example, in marl) are about 10 cm in size (such a sensitivity threshold was chosen taking into account the specific geological structure of the rocks, roofing (soil), and the presence of thin and thin layers of marl 1–5 mm thick in the productive stratum, which the sensor does not have to reap). This case corresponds to the ratio of the length of the electrodes to the diameter of the fender drums 1.2 (with the diameter of the drums 1 m). Increasing this ratio by more than 1.2, as well as reducing it to a value less than 0.8, is applied to the dilution of the mined ore, which exceeds the allowable for economic reasons. From the practice of potash mines it is known that. The dilution of the mined ore should not exceed about 5%. The distance between the plates of the electrodes is assumed to be 10 ivwi. . The workers, in contact with the rock, the surfaces of the parts of the electrodes, to achieve maximum contact, make convex along the curvature of the annular part 8 of the split slot 9. With the diameter of the annular part of the split slot formed by the AVD-type unit, 1.6 mm of the working surface of the electrodes is . g-- 1.25 1 / m. The reverse (non-working) surface of the electrodes is coated with an insulating material, for example / fluoroplastic. In order to ensure tight contact of the electrode system of the primary transducer with the side rocks, they are pivotally connected between themselves through insulators, and then springed to the rocks of the annular portion of the slit. Before starting work, both primary converters 1 of the proposed device are fixed on the housing of the main gearbox 10 of the unit in diametrically opposite places. Then the unit begins the penetration of the split slot 9. The device works as follows. When the actuator of the aggregate is inserted into the overlying rocks, the electrodes 4 of the sensing elements 2 and 3 contact with the lateral rocks of the annular part of the slit b formed by the rotary cutter of the executive organ and the spring loaded to them. As the potash crosses

seams and. The meaduplastic rocks of the signaling console of the operator of the unit receives information on the type of intersected rocks, which is fixed.

Get to the top roof of the closest formations and get information about the transition of electrodes from silviii-g to waste rock, i.e. on the appearance of the sylvinite-rock interface, the driver of the unit stops the penetration of the split slot 17. After this, I perceive elements 2 and 3 are automatically removed, for example, down. The driver then turns on the portable rotation mechanism of the fenders 6ad | aba 16 and starts the radial excavation of the sylvinite by the cylindrical chambers.

Having worked the top of the retinue of contiguous layers for one or several cycles of a radial rike (depending on the power), the driver turns off the mechanism of the rotation of the drums and lowers the executive body down the split slot. Having installed the executive organ in the split slot of the anice-section sylvinite breed in the even potash reservoir / using the information obtained earlier when cutting the split slot using the proposed device, the driver reiterates the portable rotation mechanism to carry out a radial groove of the next sylvinite. reservoir.

Due to differences in the electrical parameters of sylvinite and rock, for example, their dielectric constant or conductivity, when the sensing elements 2 and 3 are transferred from one material to another, a detuning of the resonant circuit occurs, and the voltage of the signal at the output of the measuring unit changes, then b, the ramp enters a delay unit, where it is automatically compared with a predetermined value (electrical circuit n shown). The delay unit is entered on

the case of a possible short-term separation of the electrodes 4 from the lateral rocks, as well as in the event of a possible intersection of the receiving layers 2 and 3 of thin layers of hollow rocks. 5 The invention allows to significantly increase the productivity of the unit. .and the quality of ore mined in the deserted mining of minerals.

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Claims (2)

1.Lvvorskoye termidvls1-in the USSR 601414, CL. E 21 C 35/24, 1975. 2. USSR author's certificate 45 No. 600301, cl. E 21 C 35/24, 1974. IS