Method for operation of getting machine

FIELD: mining.

SUBSTANCE: group of inventions is related to system and methods for control of getting machine along bottomhole in underground mine tunnel, and also to mining face for method realisation. Method includes measurement of gas concentration and depending on measurement results, generation of warning signal. At the same time volume of production achieved by getting machine is additionally established. In case of insufficient correlation between volume of production and gas concentration, a warning signal is generated.

EFFECT: invention provides for possibility to minimise danger of methane gas explosion in mining face, to establish fact of gas sensor failure and/or manipulation with it.

26 cl, 3 dwg

 

The present invention relates to a method of controlling a mining machine along the face in underground mining, with at least one gas sensor to measure the gas concentration and depending on the result, measurement shall be issued a warning.

This method is in principle known from practice and is used to capture a dangerous concentration of gases, in particular, to an unacceptably high concentration of methane gas. By measuring the gas concentration can be fixed increase in the mine, so issued a warning signal can be an early warning. For example, a warning signal may be used acoustic and/or optical indicator device or in the slaughter can begin off electrical loads, to minimize the danger of explosion of methane gas. Only when the measured concentration of methane at the expense of adequate ventilation after some time again falls, the operation of slaughter can continue.

In the known method, there is a problem that, contrary to modern techniques of control and still today there are explosions of gases methane in underground mining, and one reason for this is intentional manipulation of gas sensors produced by service personnel. So, from the practice of WPI is STN, the gas sensor to increase the daily output stick or sent to the gas sensor continuous flow of fresh air, so he can't detect the concentration of gases present in the mine actually. Another possible cause of the explosions of gas may be a failure of the gas sensor.

The present invention is to provide a method and device by which the current operation mode can be set the fact of manipulation or malfunction of the gas sensor.

This task is accomplished according to the features of independent claims and, in particular, by whether it is produced mining machine production volume, measured the concentration of gases and issued a warning signal, if fixed the lack of correlation between the set output and the measured concentration of gases.

The invention is based on knowledge of what is released during the extraction of coal methane is at least approximately proportional to the volume of production. Here the estimated value is approximately 20 m3methane gas produced on a ton of coal. Therefore, if increases or decreases the volume of production, you must also either to rise or to fall - usually with time delay is measured conc who trace gases. By comparing the time variation of output with the measured concentration of gases can thus establish whether there is sufficient or insufficient correlation between the two measured values. It is also possible by comparing the absolute values for different points in time to check, were, under certain circumstances, manipulation of the gas sensor. The correlation can be considered sufficient in that case, if the increase in production is set to rise in the concentration of gases, and if the decrease in production volume is also recorded (in most cases slow time) decline in the concentration of methane gas. If the gas sensor was subject to manipulation by sealing or blowing fresh air, between the production volume and gas concentration will be the lack of correlation, because then installed the gas concentration is essentially independent of the fluctuations of the produced volume production. This is a warning signal to activate, for example, display device, or to suspend operation of the face to eliminate the reasons for issuing a warning signal and ensure that the actual concentration of methane gas in the mine were low enough.

A preferred form issue the log of the invention presented in the description of the drawings, and in the dependent claims.

According to a preferred form of execution of the production volume can be calculated from the speed of the mining machine and the cutting depth. Alternative possibilities for the calculation of produced production is weighing the extracted material through located in the haulage roadway conveyor scales or definition of the extracted volume by means of ultrasonic measurements. However, the invention is not limited to these described methods.

According to a preferred variant corresponding to the invention, a method for reducing the production of mining machines you can reduce the concentration of methane within the face, as the volume produced during the extraction of coal bed methane of at least approximately proportional to the volume of production. When appropriately reduced production reduces the release of methane from coal, so that the concentration of methane within the face can be maintained below a predefined maximum value, without the need to completely stop the production. Accordingly of course you can also again to increase the volume of production of the mining machine if the measured gas concentration is sufficiently low. When a continuous process so you can set the volume of extraction so that a predefined Maxi the material is not exceeded or exceeded only briefly. Also in this embodiment of the method according to the invention can control the possible manipulation of the gas sensor, as here produced volume production after the start of production increases. Even if the gas concentration is maintained then below a predefined maximum value, while increasing production volume concentration of gases within the slaughter must also rise. If this does not happen or the measured gas concentration, contrary to, for example, not changing production volume suddenly drops, it means lack of correlation between production and concentration of gases, so that is issued a warning.

According to further aspect the invention concerns a method of controlling a mining machine along the face in underground mining, with at least one gas sensor to measure the gas concentration, and depending on the result of measurement is operated mining machine.

This method is known from practice, and the gas sensor with the known method is located in the end face (as viewed in the direction of air flow), and the mining machine completely stops, if the measured concentration of gases, in particular the measured methane concentration has exceeded a predefined limit value. Only if measured with the actual content of methane after some time due to sufficient ventilation again subsides, in this way the mining machine is again started in operation.

To increase the performance of stope without compromising safety in the mine, the concentration of gases within the face when approaching a pre-set maximum value of the gas concentration can be maintained below a predefined maximum value by reducing production mining machine without stopping the mining machine.

As the volume produced during the extraction of coal bed methane of at least approximately proportional to the volume of production, it can decrease the production of mining machines to reduce the concentration of methane within the face. When properly reduced the production volume of effluent from coal bed methane is also reduced, so that the concentration of methane within the face can be maintained below a predefined maximum value without the need to completely stop the production. Accordingly is of course also possible to again increase the volume of production of the mining machine if the measured gas concentration is sufficiently low. In a continuous process so you can set the volume of extraction so that a pre-specified maximum value is not exceeded or exceeded only briefly.

Based on the calculated volume of EXT the Chi and the measured gas concentration can be calculated concentration of gases produced in the material, moreover, in the first approximation removed from the freshly-produced coal mass, methane can be taken as proportional to the produced coal volume. The corresponding production volume and the gas content you can set volume of production so that a predefined maximum gas concentration is not exceeded, without the need had come to a complete stop cleaning the face. In other words, by reducing production, for example, reduce the rate of penetration or depth of cut, it is possible to reduce coal produced volume so that the liberated when developing the mass of methane does not exceed the permissible limit values. As it released the mass of methane was not asked, and was established earlier by measuring, using this alternative method may also be considered changing the methane content during the development process.

According to the following form run along the bottom you can provide multiple gas sensors, in particular sensors of methane, and the gas sensors are controlled and therefore are sampled in such a way that the measuring point is ahead of the mining machine when driving in the direction of air flow, and with sinking towards the direction of the air flow follows her. In affect the measurement within the face are held in different places, moreover, the interval between a mining machine and the measurement is preferably approximately constant, i.e. the measuring point moves depending on the direction of penetration at approximately constant distance in front of and, respectively, for the mining machine.

With this variant of the method can be significantly faster to install dangerous rise in methane concentration, because the measuring point is located in the immediate vicinity of the mining machine. At a known way between the time of occurrence of methane for the production of coal and measuring the concentration of gases can pass the period of time from about three to five minutes, whereas the measurement result according to the invention is provided within a few seconds, as the measurements are always close to the developed coal. However, in principle corresponding to the invention the method may be implemented with only one gas sensor, which is provided at the end of the slaughter.

Further, it may be preferable to not hard to install a pre-specified maximum value, and to set it dynamically. Thus, it may be preferable, for example, to allow only short-term exceeding of the limit value, in particular if such income were measured within a slaughter, i.e. direct is built in the center. If there is only one gas sensor at the end of the slaughter, it measures a relatively mixed and diluted by ventilation methane/air mixture. In contrast, along the front of the face may locally reach up to higher concentrations of methane, which, however, should not lead to the shutdown and consequently to a reduction in the volume of production.

May also be preferable if the predefined maximum value varies depending on the position of the mining machine. If the increased concentration of methane is measured using only the gas sensor at the end of the slaughter, it would need to be classified in any case as critical, if the mining machine is in the beginning of the slaughter. Conversely, the increased concentration of methane could be permitted if the mining machine is at the end of the slaughter, as in this case, under certain circumstances, it is only local and limited time increasing methane concentration.

Influencing the volume of production of the mining machine may occur automatically by means of the regulator, while, for example, with increasing gas concentration automatically reduces the rate of penetration and/or cutting depth. On the other hand, it is also possible Regis order to illustrate the growing concentration of gas within the downhole optical means notice to signal the driver of a mining machine that it should reduce the rate of penetration and/or depth of cut.

Thus it is possible to provide, for example, in several places within the face, for example, every tenth section of the frame of the automated lining warning device that signals a miner, if the measured gas concentration is above or below the set limit value.

According to further aspect the invention concerns the development of the face with several, in particular, uniformly spaced from each other gas sensors and gas sensors can be polled by the control device individually, preferably in dependence on the position of the mining machine. This is especially preferred if the gas sensors within the face can join an already existing control devices slaughter. Such, in principle, known control devices of the face are used for electro - hydraulic control sections of the frame mechanical supports and connected to their respective neighbors, and also with the Central control system. Therefore, the individual gas sensors can be polled by the Central control system separately or together, and simultaneously minimized costs for methane measurements.

Pre is respectfully, if a control system that contains a calculation device, control is carried out, whether there is sufficient or insufficient correlation between production volume and gas concentration.

For example, the control system using electronic computers can record the time course of the produced output and the measured gas concentration and by appropriate algorithms to check if insufficient current or sufficient correlation. For example, you may be issued a warning signal, if increasing production above a given threshold in a given time interval thereafter not found any lifting gas concentration above the next threshold. On the contrary, a warning signal may also be generated if the measured gas concentration decreases, albeit not been a corresponding reduction in produce production. After the suspension of the mining machine must be parsable more pronounced decrease in the measured concentration of methane, even if this reduction can occur with a time lag. If, however, for example, manipulation of a gas sensor, a gas sensor is sent to a continuous flow of fresh air, the measured concentration gotostate substantially constant, so using the appropriate the invention, a method is fixed the lack of correlation between production volume and gas concentration and is issued a warning.

Further, the invention is described purely as an example, through a preferred form of execution, and with reference to the attached drawings.

They show:

Figure 1 - schematic representation of the stope;

Figure 2 - schematic course of the produced output and the measured gas concentration at a sufficient correlation; and

Figure 3 - curves according to figure 2, with the lack of correlation.

Figure 1 shows a greatly simplified representation of the stope with many of adjacent sections 10 frame mechanical supports, which in the usual way connected with the conveyor (not shown). Figure 12 marked the mining machine, which can be made as a screw Executive body or a plane. The direction of air flow indicated in the drawing by arrows W, i.e. the vent stream is moving in the representation of figure 1 in a counterclockwise direction.

For measurements occurring within the bottom of methane concentration provided by the sensors 14 of methane along the face, for example, every tenth section frame mechanical supports, which are connected through a common bus 16 with the control system 20 is. When this bus 16 may be a data bus, which controls the individual sections of the frame 10 mechanical supports communicated with each other. Additionally, at the end of the slaughter has another sensor 18 of methane. Using system 20 management, in which we can talk about the Central control of the individual sections 10 frame mechanical supports, individual gas sensors 14 are controlled and therefore are polled individually, namely depending on the position of the mining machine 12 along the front of penetration, which is also covered by the system 20 controls. While the sensors 14 of methane are polled and respectively read in such a way that moving the mining machine place of measuring ahead of the mining machine 12 when driving in the direction of the air flow and follows it with sinking towards the direction of the air flow. In other words, the measuring point moves at a constant distance in front of and, respectively, behind the mining machine 12.

Through communication connection (not shown) are also transferred to the control system 20, on the one hand, the speed of the mining machine and, on the other hand, the set depth of cut, and depending on the speed and depth of cut, the control system 20 calculates the volume of production, i.e. mass produced coal. From the expect to the frame of production and from the measured concentration of methane control system then determines the methane content in the produced material. This calculation is performed continuously, so that when changing the gas content in the extracted material is calculated different concentration of gas.

Figure 2 strongly shown schematically by the dashed line recorded by the control system produced by production volume in cubic meters, and the dash-dotted line is measured by the gas sensor, the gas concentration in percent. As you can see, the rise of production should rise to the gas concentration and the gas concentration should be on time about the progress made production. If the control system detects such a correlation, then it is characterized as sufficient, and no warning signal will be issued.

Figure 3 also shows highly schematically the process of production, in which at time t1happened manipulation methane gas sensor. Due to this manipulation of the measured concentration of methane gas heavily decreasing, although manufactured production volume remains approximately constant. Thus, for example, by determining a first time derivative signal of gas concentration and installed the produced volume of production, the control system may be determined that both of these measured values do not behave approximately the same, so may be issued a warning.

Further, the control system 20 is placed on the basis of the previously calculated gas content calculates the required volume of production, which leads to the gas concentration, which lies below the specified maximum gas concentration indicated by max figure 3. If, for example, the methane content in the produced coal rises, the system 20 automatically reduces the rate of penetration and/or depth of cut, namely in such a way that the specified maximum concentration of methane gas does not reach that presented in figure 3.

Alternative or additionally, the control system 20 can manage a variety of optical display devices that are located within the face, for example, again at every tenth shield, and who may also join the regulators sections frame mechanical supports. Such optical indicator device may contain, for example, three different colored lights and a green light indicates that the measured methane concentration lies below the threshold value, the red signal light may signal that the concentration has reached the threshold value, and a yellow signal light may signal that the measured methane concentration approaches the threshold value. Thus the operator of the mining machine can appropriately adjust manually the volume of production, for example, by reducing the rate of penetration or depth of cut.

Using matched with the existing invention of the method and, respectively corresponding to the invention can continuously and without stopping production to manage clearing face so that due to the volume of production does not reach the limit value of methane. Simultaneously it is possible to optimize the volume of production, given the content of methane, and to register manipulation of gas sensors.

1. The method of operation of the mining machine along the face in underground mining, in which at least one gas sensor to measure concentrations of gases and depending on the measurements give a warning signal, characterized in that to determine the volume of production of the mining machine, measure the concentration of gases and generates a warning signal if fixed the lack of correlation between the set output and the measured concentration of gases.

2. The method according to claim 1, characterized in that the speed of the mining machine and the cutting depth calculate the volume of production and, in particular, of the calculated output and the measured gas concentration calculate the gas content in the produced material.

3. The method according to claim 1, characterized in that along the bottom provide several gas sensors, and the place of measurement, in particular, at a constant distance from the mining machine when driving in the direction of the air flow ahead of the mining machine which follows it when driving towards the direction of the air flow.

4. The method according to claim 1, characterized in that at the end of the slaughtering provide a gas sensor.

5. The method according to claim 1, characterized in that on the basis of the warning signal of the mining machine to stop it.

6. The method according to claim 1, characterized in that a warning signal is within slaughter, in particular, optical and/or acoustic indicator device.

7. The method according to claim 6, characterized in that the signal is carried out within the bottom in several places, particularly on the sections of the frame mechanical supports.

8. The method according to claim 1, characterized in that to determine the correlation between production volume and gas concentration with regard to the temporal changes of production volume and temporal change in the measured gas concentration and/or changes in the absolute value of production and changes in the absolute value of the measured gas concentration.

9. The method according to claim 1, characterized in that when approaching a pre-set maximum value of the gas concentration with a decrease in production volume production machines the gas concentration within the bottom support below a predefined maximum value without stopping while the mining machine.

10. The method of controlling the mining machine along the face in underground mining, in which at least one gas sensor to measure the end is the filtration of gases and depending on the measurements operate a mining machine, moreover, when approaching a pre-set maximum value of the concentration of gases by reducing the production of the mining machine, the gas concentration within the bottom support below a predefined maximum value, without stopping while mining machine, characterized in that the decrease in production volume provide by reducing the depth of cut.

11. The method according to claim 10, characterized in that the speed of the mining machine and the cutting depth calculate the volume of production and, in particular, of the calculated output and the measured gas concentration calculate the gas content in the produced material.

12. The method according to claim 10, characterized in that along the bottom provide several gas sensors, and the place of measurement, in particular, at a constant distance from the mining machine when driving in the direction of the air flow ahead of the mining machine and follows it with sinking towards the direction of the air flow.

13. The method according to claim 10, characterized in that at the end of the slaughtering provide a gas sensor.

14. The method according to claim 10, characterized in that to determine the correlation between production volume and gas concentration with regard to the temporal changes of production volume and temporal change in the measured gas concentration and/or changes in the absolute value of the production volume and the change in the absolute value of the measured gas concentration.

15. The method according to claim 10, wherein the pre-specified maximum value varies depending on the position of the mining machine and/or from temporary fluctuations.

16. The method according to claim 10, characterized in that within the slaughter show, in particular, the optical indicator device is approaching if the measured gas concentration to a specified maximum gas concentration or reaches it.

17. The method according to item 16, wherein the notification within slaughter occurs in several places, particularly on the sections of the frame mechanical supports.

18. Cleaning the face for carrying out the method according to one of claims 1 to 9, containing a mining machine and many sections of the frame mechanical supports, characterized in that along the stope has several, in particular, uniformly spaced from each other gas sensors, and provides a calculation device for calculating the amount of production, depending on the speed of the mining machine and the cutting depth, and to establish a correlation between the production volume and gas concentration change in time production and the change with time of the measured gas concentration.

19. Cleaning the face on p, characterized in that the gas sensors can be polled by the control system individually, depending on the position of the mining machine.

20. About Estoy slaughter on p or 19, characterized in that at the end of the slaughter, when viewed in the direction of air flow, an additional gas sensor.

21. Cleaning the face on p, characterized in that distant, in particular, uniformly apart frame sections mechanical supports provided by optical and/or acoustic indicating device, by means of which served a warning signal.

22. Cleaning the face on p, characterized in that distant, in particular, uniformly apart frame sections mechanical supports provided by the optical indicator device with which it is shown approaching whether the measured gas concentration to a specified maximum gas concentration or reaches it.

23. Cleaning the face on p, characterized in that each section of the frame mechanical supports includes an electric control unit which communicates with neighboring control devices, and at least some of the control devices connected to the gas sensor.

24. Control system for stope on p, characterized in that a calculation, by which, depending on the speed of the mining machine and the cutting depth is calculated volume of production, and a temporary change of production and temporary change izmereno the gas concentration is established correlation between production volume and gas concentration.

25. The control system according to paragraph 24, containing the device polling for individual polling of several gas sensors, the unit of comparison for the calculation of the correlation between the measured gas concentration and the actual production volume, and an output unit which, when the lack of correlation gives a warning signal and/or control signal.

26. Control system for stope on p, characterized in that a calculation, by which, depending on the speed of the mining machine and the cutting depth is calculated volume of production, and a temporary change of volume of production and a temporary change in the measured gas concentration is established correlation between production volume and gas concentration, as well as a device for calculating the calculated production volume and the measured gas concentration of the gas content in the produced material.
Priority items:

05.09.2006 according to claims 1-17;

27.03.2007 by PP-26.



 

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EFFECT: higher efficiency.

1 dwg

The invention relates to mining and can be used for drive control of the supply of coal Shearer mining coal

The invention relates to communication systems in which the transmission medium is the earth, and in particular to methods of signaling used in mines or tunnels

FIELD: mining industry.

SUBSTANCE: device has two asynchronous electric engines, connected via reducers to drive sprockets of continuous traction chain, provided with plane carriages with their possible displacement along the guide, and hydraulic cylinders for displacing guide on pit-face. To windings of stators of first and second electric engines connected respectively are outputs of first and second frequency converters, inputs of which are connected to power grid and control inputs of which are connected respectively to outputs of first and second frequency adjusters. To frequency adjusters also connected are inputs of load detectors, to outputs of which load balancing block is connected, outputs of which are connected to inputs of first frequency adjuster. To inputs of both frequency adjusters output of load adjuster is connected, inputs of which are connected to load-setting block and load sensor for second engine. To output of second frequency converter connected are input of control block, other input of which is connected to signal block of base plant, and stator winding of third asynchronous engine, which via mechanical link is connected to first and second hydraulic pumps, having constant working volumes. Output of first hydraulic pump is connected to force hydro-main and input of second preventing hydraulic valve and to first inputs of two-position hydraulic distributors with electromagnetic control, to electromagnets of which outputs of control block are connected. Second inputs of two-positional hydraulic distributors with electromagnetic control are connected to control chambers of hydro-controlled two-positional hydro-distributors, which are part of hydro-blocks. Outputs of hydro-controlled two-positional distributors are connected to opposite hollows of volumetric dosing device of each hydro-block, and their inputs are connected respectively to outputs of hydro-distributors for controlling hydro-cylinder for moving the guide on pit-face, inputs of each of which are connected to force and drain hydro-mains, and outputs are connected to piston and rod hollows of appropriate hydro-cylinder.

EFFECT: higher efficiency.

1 dwg

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