CN113047829B - Method for determining structural firmness of coal body based on operation parameters of heading machine - Google Patents
Method for determining structural firmness of coal body based on operation parameters of heading machine Download PDFInfo
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- CN113047829B CN113047829B CN202110373750.3A CN202110373750A CN113047829B CN 113047829 B CN113047829 B CN 113047829B CN 202110373750 A CN202110373750 A CN 202110373750A CN 113047829 B CN113047829 B CN 113047829B
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- 239000003245 coal Substances 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000005641 tunneling Effects 0.000 claims abstract description 21
- 238000012544 monitoring process Methods 0.000 claims abstract description 10
- 238000004364 calculation method Methods 0.000 claims description 4
- 238000011161 development Methods 0.000 claims description 4
- 238000012360 testing method Methods 0.000 abstract description 9
- 238000005070 sampling Methods 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/003—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells by analysing drilling variables or conditions
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C39/00—Devices for testing in situ the hardness or other properties of minerals, e.g. for giving information as to the selection of suitable mining tools
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/40—Investigating hardness or rebound hardness
- G01N3/405—Investigating hardness or rebound hardness by determining the vibration frequency of a sensing element in contact with the specimen
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Abstract
The invention belongs to the technical field of coal bed basic parameter measurement, discloses a method for determining the firmness of a coal body structure based on the operation parameters of a heading machine, aims to solve the problems of complex sampling process, long parameter testing period and the like of the traditional coal body firmness testing, and comprises the following steps: in the process of tunneling a coal mine tunnel, a derivative index for measuring the coal body structure is obtained by monitoring the vibration intensity and the cutting power change condition of the tunneling machine and carrying out weighted average on the vibration intensity and the cutting power. The method can be used for rapidly determining the firmness condition of the coal body, and is more time-efficient and continuous compared with the traditional coal body firmness testing method.
Description
Technical Field
The invention belongs to the technical field of coal bed basic parameter measurement, and particularly relates to a method for determining the structural firmness of a coal body based on the operation parameters of a heading machine.
Background
The firmness parameter of coal is one of basic parameters in the coal mine production process, and in the section rules for preventing coal and gas outburst, the firmness coefficient of coal is a key index for identifying outburst coal seams. When the firmness of the coal is small, the coal body is easy to break, so that the gas in the coal body is desorbed, and the probability of coal and gas outburst accidents is high. The existing test for the coal firmness factor is to first sample the coal downhole, then screen the coal sample, and finally test the coal firmness by the drop hammer method. In the whole process, the problems of complex sampling process, long parameter testing period and the like exist.
At present, the tunneling working face is the most serious place where coal and gas outburst accidents happen. The heading machine is in direct contact with a coal body during heading, and a great amount of data including vibration intensity, energy consumption, power and the like can be generated by the heading machine in the process. The firmness of the coal is the capability of resisting damage, and from the energy perspective, if the vibration intensity and the power generated when the tunneling machine works are larger, the larger the energy applied to the coal body by the tunneling machine can be reflected, and the firmer the coal body is.
Disclosure of Invention
In view of the above, the present invention provides a method for determining the firmness of a coal body structure based on the operating parameters of a heading machine, which is convenient to operate and has strong practicability, and determines the firmness of coal by monitoring the vibration and power of the heading machine, so as to overcome the problems of complicated sampling process and long parameter testing period of the traditional coal body firmness testing, and make the firmness testing of the coal body before heading faster and more accurate.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a method for determining structural firmness of coal based on operating parameters of a heading machine, which comprises the following steps: acquiring the vibration intensity and cutting power of the heading machine in the heading process; and carrying out weighted average on the vibration intensity and the cutting power of the tunneling machine to obtain a derivative index for measuring the coal body structure.
Further, the vibration intensity of the tunneling machine is the vibration intensity of the tunneling machine, and a vibration sensor for monitoring the vibration speed of the tunneling machine in the tunneling process is arranged on the tunneling machine.
Further, the calculation formula of the vibration intensity of the heading machine is as follows:
in the formula: vrms is vibration intensity, unit mm/s; t is the time of the measured signal, in units of s; v (t) is the vibration speed of the heading machine in mm/s.
Further, the cutting power of the heading machine is the direct power output by the broken coal body, a power meter for monitoring the cutting power of the heading machine in the heading process is arranged on the heading machine, and the cutting power of the heading machine is represented by P and is in KW unit.
Further, the weighted average is to give a weight to the vibration intensity Vrms and the cutting power P of the tunneling machine respectively, and the obtained derivative indexes are as follows:
in the formula: k is a derivative index for measuring the coal body structure; a is the weight of the vibration intensity; b is the weight of the clipping power.
The beneficial effects of the invention are: according to the method for determining the structural firmness of the coal body based on the operating parameters of the heading machine, the firmness of the coal body can be rapidly determined by monitoring the vibration and power change conditions of the heading machine in the process of tunneling a coal mine tunnel. Compare traditional coal body tightness test method, this method can judge the tightness of coal body in real time, convenient operation and practicality are strong.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For a better understanding of the objects, aspects and advantages of the present invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic view of the working state of the heading machine of the present invention;
FIG. 2 is a schematic diagram showing the relationship between the power and time of the cutting part of the heading machine according to the present invention;
FIG. 3 is a schematic diagram showing the relationship between the vibration intensity and the time of the heading machine according to the present invention;
FIG. 4 is a schematic diagram of the relationship between the coal structure derivation index and time in the present invention;
description of reference numerals: the device comprises a heading machine 1, a vibration sensor 2, a power meter 3 and a coal body 4.
Detailed Description
The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; for a better explanation of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
As shown in fig. 1, in the method for determining the structural robustness of the coal body based on the operation parameters of the heading machine, the vibration intensity of the heading machine and the real-time power of the working state of the heading machine are monitored during the heading process, and the two parameters are weighted and averaged to obtain a derived index for measuring the structure of the coal body. Specifically, when a certain mine is subjected to coal roadway tunneling construction, a tunneling machine 1 is adopted for tunneling, vibration intensity and cutting power of the tunneling machine in a working state are monitored in real time by installing a vibration sensor 2 for monitoring vibration parameters of a long arm of the tunneling machine 1 in real time and a power meter 3 installed at the tail part of the tunneling machine, and then a derivative index calculation formula is obtained through weighted average, so that online monitoring of a coal body 4 structure is formed. Namely: the vibration intensity of the heading machine is the magnitude of the vibration intensity of the heading machine, and the calculation formula of the vibration intensity of the heading machine is as follows:
in the formula: vrms is vibration intensity, unit mm/s; t is the time of the measured signal in units of s; v (t) is the vibration speed of the heading machine in mm/s. The cutting power of the development machine is the direct power output by the broken coal body 4, and is expressed by P and unit KW. The weighted average is to respectively give a weight to the vibration intensity Vrms and the cutting power P of the tunneling machine, and the obtained derivative indexes are as follows:
in the formula: k is a derivative index for measuring the coal body structure; a is the weight of the vibration intensity; b is the weight of the clipping power, and a + B is 1.
As shown in figure 2, the power of the cutting part of the heading machine changes with time. Because the output power change condition of the cutting part of the heading machine reflects the power required for crushing the coal body and indirectly reflects the hardness degree of the coal body, when the coal body is hard, the output power is higher, and when the coal body is soft, the output power is lower. As can be seen from the graph, the output of the cutting portion of the boring machine was high at the 25 th and 65 th seconds, and the coal body thus excavated was relatively hard, while the power of the boring machine was low at the 40 th and 75 th seconds, and the coal body thus excavated was relatively soft.
As shown in fig. 3, the variation data of the long arm vibration intensity of the heading machine in the working state along with time reflects the variation of the hardness of the coal structure, when the coal is hard, the vibration intensity of the long arm of the heading machine is high, and when the coal is soft, the vibration intensity of the long arm of the heading machine is low. The monitoring of the vibration of the long arm of the heading machine is not limited to the vibration intensity index, and parameters such as vibration amplitude, frequency and the like of the long arm in the working state of the heading machine can be monitored according to the index sensitivity.
The graph of the relationship between the coal structure derivative indicator and the time shown in fig. 4 is calculated by using two parameters of the power and the vibration intensity according to the same weight. Two factors of vibration of a power meter of the heading machine are integrated, and the figure shows that when the roadway is tunneled, when the roadway is tunneled in the 25 th second and the 65 th second, the firmness derivative index is large, which indicates that the coal body dug by the heading machine is firm and high in hardness; the measure of firmness derivative is the smallest at the 40 th and 75 th seconds, which indicates that the coal body dug by the heading machine is softer and has lower hardness. The selection of the parameter weight should take into consideration the sensitivity of the parameter index in a certain area.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (4)
1. The method for determining the structural firmness of the coal body based on the operating parameters of the heading machine is characterized by comprising the following steps of:
acquiring the vibration intensity and cutting power of the development machine in the development process;
the vibration intensity of the heading machine is the vibration intensity of the heading machine, and the calculation formula is as follows:
in the formula: vrms is vibration intensity, unit mm/s; t is the time of the measured signal, in units of s; v (t) is the vibration speed of the heading machine in mm/s;
the cutting power of the development machine is the direct power output by the crushed coal body (4), and is expressed by P and unit KW;
and carrying out weighted average on the vibration intensity and the cutting power of the tunneling machine to obtain a derivative index for measuring the coal body structure, wherein the larger the derivative index is, the firmer the coal body structure is.
2. The method for determining the structural firmness of the coal body based on the operating parameters of the heading machine as claimed in claim 1, wherein the heading machine (1) is provided with a vibration sensor (2) for monitoring the vibration speed of the heading machine during heading.
3. The method for determining the structural firmness of the coal body based on the operating parameters of the heading machine according to claim 2, wherein the heading machine is provided with a power meter (3) for monitoring the cutting power of the heading machine during heading.
4. The method for determining the structural firmness of the coal body based on the operating parameters of the heading machine as claimed in claim 3, wherein the weighted average is obtained by assigning a weight to each of the vibration intensity Vrms of the heading machine and the cutting power P, and the derived indicators are as follows:
in the formula: k is a derivative index for measuring the structure of the coal body; a is the weight of the vibration intensity; b is the weight of the clipping power.
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| CN103310056A (en) * | 2013-06-14 | 2013-09-18 | 山东科技大学 | Parametric modeling method for longitudinal axis heading machine cutting head |
| CN111794803A (en) * | 2020-06-10 | 2020-10-20 | 新汶矿业集团设计研究院有限公司 | Method for monitoring filling effect and evaluating stability of gob-side entry retaining in filling mining |
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| DE4025551A1 (en) * | 1989-09-25 | 1991-04-04 | Spies Klaus | METHOD AND DEVICE FOR CONTROLLING EXTRACTION AND DRIVING MACHINES ALONG A CUTTING HORIZON BETWEEN COAL AND STONE |
| US9249654B2 (en) * | 2008-10-03 | 2016-02-02 | Halliburton Energy Services, Inc. | Method and system for predicting performance of a drilling system |
| US20120330577A1 (en) * | 2011-06-22 | 2012-12-27 | Honeywell International Inc. | Vibration severity analysis apparatus and method for rotating machinery |
| CN108805352B (en) * | 2018-06-08 | 2021-10-01 | 中国矿业大学 | Method for evaluating water damage risk of overlying strata and separation layer of mining area |
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| CN111794803A (en) * | 2020-06-10 | 2020-10-20 | 新汶矿业集团设计研究院有限公司 | Method for monitoring filling effect and evaluating stability of gob-side entry retaining in filling mining |
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