SU1548470A1 - Method of safeguarding filling conduit against clogging - Google Patents

Abstract

The invention relates to the mining industry and can be used in the underground mining of mineral deposits. The goal is to increase the reliability of protection of the filling pipeline (TP) against blockage by predicting the latter and increasing the information content during the transportation process. For this purpose, acoustic sensors (BP) are installed on the filling TP. The amplitude and time of action of the control acoustic signals are measured when portions of the backfill mixture pass through the TP. As control parameters, the time of passage of portions of the filling mixture between BP is determined. The basic parameters are the time of passage of portions of the filling mixture in the optimal composition and steady state. For the filling mixture, the reference dependence of the amplitude of the acoustic signal and the time between pulses on the ratio of liquid to solid is established. Set the ratio of liquid and solid in the mixture by comparing the actual amplitudes and time between pulses with the reference ones. At the same time, the blood pressure is connected to a frequency converter, the signal from which in the form of a binary-decimal code is fed to a software device. In the latter, a comparison of the passage time of a portion of the mixture between BP with the basic parameters takes place. When the actual time is exceeded, a basic sound and light signaling is issued, predicting the beginning of the formation of a blockage of TP. To prevent the latter, a command is issued to increase the supply of the liquid phase to the mixture and shut off the complex. This ensures the elimination of blockage. 2 hp f-ly, 1 ill.

Description

The invention relates to the mining industry and can be used in the underground mining of mineral deposits.

The purpose of the invention is to increase the reliability of protection of the backfill pipeline against blockage by predicting the latter and increasing

informativeness in the process of transportation.

The drawing shows a device that implements the proposed method.

The device includes acoustic sensors 1 - n, for example, installed on a horizontal section of the pipeline, 2 - m frequency converters, for example, type, software, 3 DK-81, a control indicator showing a recording device of the type KSP-3 actuator (not shown) . The number of acoustic sensors depends on the length of the danger zone in which blockage may occur. In the complex under investigation, the first acoustic sensor is installed, for example, at a distance of 50 m from the vertical position, the second is installed at a distance of 350 m. The surface of the compressed air supplied to the pneumatic cutting machine, for example, 7 atm, the diameter of the pipeline is 377 mm.

The acoustic sensor is connected to a frequency converter, the signal from which in the form of a binary-decimal code is fed to the software device 3, where a successive comparison of the passage time of a portion of the mixture between the sensors with the basic parameters takes place. When the actual time is exceeded, a basic sound and light signaling is issued, predicting the beginning of a pipeline blockage, to prevent which a command is given to increase the supply of the liquid phase to the mixture and shut off the complex, thus eliminating the emergency situation — the blockage.

Acoustic devices are connected to a software device in parallel by a two-wire communication line. The diagram of the software device shows successively information about the passage of portions of the filling mixture of acoustic devices and the amount of the mixture fed through the pipeline.

In addition, an analog signal is output from the frequency converter via a separate communication line, which is fed to a control indicating and recording device. The instrument records the amplitude and frequency of the signal generated by the portion of the mixture. The signal amplitude can be used to determine the speed of movement of the mixture portion and the size of the portion, the frequency of the signal determines the quality of the mixture. The more

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the amplitude, the greater the density of the mixture, and the distance between the amplitudes determines the time of passage of a portion of the mixture of the base distance, i.e. backfill pipeline and operation of the complex as a whole.

The passage time of a portion of the mixture is 7 seconds and depends on the capacity and quality of the mixture. The time between portions is 30 s. The passage speed at the beginning of the pipeline is minimal and increases as it moves away. The time between portions is increased, where the second acoustic device is installed, and is AO s, the travel time is 5 s. This is due to the fact that the farther from the vertical position along the horizontal pipeline the portions are interconnected, the passage time of the portion increases along with the speed and time between portions.

Studies have shown that the most dangerous section where the pipeline is being driven is from the first pneumatic cutting machine. Therefore, installing acoustic devices in this area at points, it is possible to control the passage of the mixture with high accuracy and reliability and predict the blockage of the pipeline to take appropriate measures, such as quickly increasing the water supply to the mixture.

The proposed method makes it possible to increase the reliability of the backfill complex, since it is possible to predict in advance the time and place of the start of blockage of the pipeline and almost completely eliminate the blockage of the pipeline, and this leads to an increase in the quality of the backfill array, lower losses and dilute the mixture.

Claims (3)

1. The method of preventing the filling pipeline from blocking, including the installation of sensors on the pipeline, measuring the amplitude and time of the control signals during the passage of portions of the filling mixture through the pipeline, determining control parameters, comparing the actual control parameters with the baseline and the effect on the filling mixture when the control signals are exceeded above basic In order to improve the reliability of protecting the filling pipeline from blocking due to the prediction of the latter and increasing the informativity of the mixture transporting process, the transit time of the portions of the filling mixture between the sensors is determined as the control parameters portions of the filling mixture in the optimal composition and steady-state mode, acoustic sensors are installed on the pipeline, and the amplitude do and time of exposure to acoustic signals. 2. The method according to claim 1, characterized in that for filling ten s jr 20 5 8470 the mixtures establish the reference dependence of the amplitude of the acoustic signal and the time between pulses on the ratio of liquid to solid and establish the ratio of liquid to solid in the mixture by comparing the actual amplitudes and time between pulses with the reference ones. 3. Method pop.1, characterized in that for each filling mixture the reference dependence of the square of acoustic pulses on the quantity of the mixture in a batch is determined, the actual area of acoustic pulses is measured and, taking into account the standard dependence, the quantity of the mixture in a batch is taken into account and the performance of the filling complex. Editor L.Zatseva Compiled by N. Rudenko Tehred L. Serdyukova Order 126 Circulation 379 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 Mixture Proofreader M.Sharoshi Subscription