CN111521490B - Induction test device for hydrogen bond fracture of loaded coal rock - Google Patents

Abstract

The invention relates to an induction test device for hydrogen bond fracture of loaded coal rock, which belongs to the technical field of coal rock monitoring and accident prevention and control. The induction test device for the rupture of the hydrogen bond of the loaded coal rock includes a base and a charge sensor arranged inside the transparent vacuum box, an infrared spectrum analyzer and a computer arranged outside the transparent vacuum box, the base is provided with a protective shell with holes, The bottom of the transparent vacuum box is provided with a bottom switch port, and the bottom switch port communicates with the infrared spectrum analyzer through a channel, and the top of the charge sensor is provided with a charge probe, and the computer is respectively connected with the transparent vacuum box, the charge sensor and the infrared spectrum analyzer. The induction test device for the hydrogen bond fracture of the loaded coal rock can simulate the pressure state of the deep underground coal rock, and can test and analyze the coal rock sample from the macroscopic and microscopic perspectives, and quickly and effectively judge the hydrogen bond fracture situation. It provides a theoretical basis for predicting and forecasting mine dynamic disasters.

Description

An induction test device for hydrogen bond fracture of loaded coal rock

technical field

The invention relates to the technical field of coal rock monitoring and accident prevention, in particular to an induction test device for hydrogen bond fracture of loaded coal rock.

Background technique

With the increasing demand for coal resources and the advancement of mining technology, more and more coal mines have entered the deep development period, and deep mining has become an inevitable trend in the development of the coal industry. However, since the composition and structure characteristics, deformation and failure characteristics, energy accumulation and release characteristics and corresponding engineering characteristics of deep coal and rock are obviously different from those of shallow coal and rock, it is more likely to cause fracture and landslide accidents, resulting in loss of life and property, so new monitoring technologies and prevention technology.

The basic structure of coal is indeed a molecular group composed of multiple coal macromolecules, weak interactions between molecules are common, and there are a large number of hydrogen bond crosslinks between and within coal molecules. Moreover, there are electromagnetic radiation signals in the process of deformation and fracture of loaded coal rocks, and the generation of electromagnetic radiation is caused by the variable speed movement of charged particles. Therefore, the premise and foundation of electromagnetic radiation is the separation of charges, that is, positive and negative charges on the macroscopic scale. The final recovery of these separated charges is the process of the coal rock mass being electrically neutral on the macroscopic scale, which is the process of electromagnetic radiation. In summary, the process of charge transfer is also the process of electromagnetic radiation.

Existing research has calculated the hydrogen bond interaction between macromolecular organic matter, and obtained the conclusion that the greater the amount of charge transfer, the stronger the hydrogen bond interaction; Hydrogen bonds, because the action of external force is not enough to change the internal configuration of coal molecules. When hydrogen bond breaking occurs, it must be accompanied by charge transfer. With the destruction of coal and rock mass, a large number of hydrogen bonds are broken, and a large number of charges are transferred. Therefore, the breaking of hydrogen bonds in the process of coal destruction makes an important contribution to the separation of charges, that is to say, the breaking of hydrogen bonds is the main cause of coal-rock electromagnetic radiation. Therefore, it is of great significance to study the hydrogen bond breaking state in the coal-rock fracture process to reveal the mechanism of coal-rock electromagnetic radiation and the mechanism of coal-rock dynamic disasters.

Contents of the invention

In order to solve the technical problems existing in the prior art, the present invention provides an induction test device for hydrogen bond fracture of loaded coal rocks, which can simulate the pressure state of deep underground coal rocks, and can conduct macroscopic and microscopic analysis of coal rock samples. Test analysis can quickly and effectively judge the hydrogen bond breaking situation, and provide a theoretical basis for predicting mine dynamic disasters.

In order to achieve the above object, technical scheme of the present invention is:

An induction test device for hydrogen bond rupture of loaded coal rocks, comprising a base and a charge sensor arranged inside a transparent vacuum box, and an infrared spectrum analyzer and a computer arranged outside the transparent vacuum box;

The base is provided with a protective casing with holes, and the protective casing with holes is used to cover coal and rock samples;

The bottom of the transparent vacuum box is provided with a bottom switch port, and the bottom switch port communicates with the infrared spectrum analyzer through a channel, so that the cracked coal rock sample enters the infrared spectrum analyzer from the transparent vacuum box;

The top of the charge sensor is provided with a charge probe for detecting charge signals;

The computer is respectively connected with the transparent vacuum box, the charge sensor and the infrared spectrum analyzer, and the computer controls the transparent vacuum box to apply pressure to the coal rock sample, and receives the pressure signal of the transparent vacuum box, the charge signal of the charge sensor and the infrared spectrum analyzer. spectral signal.

Further, a heating rod and a temperature sensor are arranged inside the transparent vacuum box, and the heating rod and the temperature sensor are respectively connected to a computer, and the computer controls the heating of the heating rod and receives a temperature signal from the temperature sensor.

Further, the pressure signal, charge signal, spectral signal and temperature signal are sequentially input into the computer through the receiving module, filter, modulator, A/D converter and demodulator.

Further, the bottom opening is provided with a switch, the switch is connected to a computer, and the computer controls the opening and closing of the bottom opening.

Further, the transparent vacuum box is provided with a pressure gauge and a pressure release switch.

Beneficial effects of the present invention:

1) The components in the present invention are precisely connected, simple in structure, and small in size, ensuring the accuracy of each component in the installation process and work, and minimizing errors, and the present invention has sufficient structural strength, good durability, and easy operation Simple and convenient, low production cost, high control precision, to meet the needs of safe work;

2) The present invention simulates the deep downhole pressure through a vacuum box to conduct induction experiments on coal and rock samples, using infrared spectrum technology and sensing technology, specifically through infrared spectrum analyzers, charge sensors and temperature sensors to macroscopically and microscopically affect the coal rock samples. Test and analyze the hydrogen-loaded bond breakage. According to the spectral signal and charge signal data image, the hydrogen bond breakage can be quickly and effectively judged, and the influence of temperature and pressure on hydrogen bond breakage can be obtained according to the temperature and pressure signal data image. Provide a theoretical basis for mine dynamic disasters;

3) The experimental data of the present invention can provide early warning for ground pressure disasters in deep underground mines, provide a theoretical basis for predicting and early warning mine dynamic disasters, avoid serious damage and casualties in underground mines, and reduce the loss of life and property in deep underground mines.

Other features and advantages of the present invention will be partially explained in the following detailed description.

Description of drawings

Fig. 1 is a structural schematic diagram of an induction test device for hydrogen bond fracture of loaded coal rock provided by an embodiment of the present invention;

Fig. 2 is the schematic diagram of the computer control structure provided by the embodiment of the present invention;

Fig. 3 is a program block diagram of the hydrogen bond fracture test of loaded coal rock under normal temperature provided by the embodiment of the present invention;

Fig. 4 is a program block diagram of a hydrogen bond fracture test of loaded coal rock when the temperature is raised provided by the embodiment of the present invention.

The reference signs in the accompanying drawings of the specification include:

1-pressure gauge, 2-pressure relief switch, 3-heating rod, 4-protective casing with holes, 5-coal rock sample, 6-base, 7-charge probe, 8-charge sensor, 9-bottom switch port, 10 -channel, 11-infrared spectrum analyzer, 12-temperature sensor, 13-transparent vacuum box, 14-computer.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them.

In describing the present invention, it should be understood that the terms "longitudinal", "transverse", "vertical", "upper", "lower", "front", "rear", "left", "right", The orientation or positional relationship indicated by "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and Simplified descriptions, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and thus should not be construed as limiting the invention.

In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be mechanical connection or electrical connection, or two The internal communication of each element may be directly connected or indirectly connected through an intermediary. Those skilled in the art can understand the specific meanings of the above terms according to specific situations.

In order to solve the problems existing in the prior art, as shown in Figures 1 to 4, the present invention provides an induction test device for hydrogen bond rupture of loaded coal rocks, including a base 6 and a charge sensor arranged inside a transparent vacuum box 13 8, and the infrared spectrum analyzer 11 and the computer 14 that are arranged on the outside of the transparent vacuum box 13;

The base 6 is provided with a protective casing 4 with holes, and the protective casing 4 with holes is used to set the coal rock sample 5;

The bottom of the transparent vacuum box 13 is provided with a bottom switch port 9, and the bottom switch port 9 communicates with the infrared spectrum analyzer 11 through a channel 10, so that the cracked coal rock sample 5 enters the infrared spectrum analyzer 11 from the transparent vacuum box 13;

The top of the charge sensor 8 is provided with a charge probe 7 for detecting charge signals;

The computer 14 is respectively connected with the transparent vacuum box 13, the charge sensor 8 and the infrared spectrum analyzer 11. The computer 14 controls the transparent vacuum box 13 to apply pressure to the coal rock sample 5, and receives the pressure signal of the transparent vacuum box 13 and the charge of the charge sensor 8. signal and the spectral signal of the infrared spectrum analyzer 11.

In the present invention, the transparent vacuum box 13 is controlled by the computer 14 to realize the function of pumping and applying pressure, simulating the pressure state of deep coal rocks, and meeting the actual conditions of on-site work. The transparent vacuum box 13 is provided with a base 6 for protecting the holes The shell 4 is fixed, and the coal rock sample 5 is inserted into the protective shell 4 with holes, and fixed on the base 6. The protective shell 4 with holes meets the requirements of not affecting the vacuum box to exert pressure on the coal rock sample 5, and at the same time prevents the coal rock sample 5 Explosion affects the test device. In actual use, due to the low hardness of the coal rock, combined with the protection of the protective shell 4 with holes, the fragmentation will not affect other equipment. A charge sensor 8 is provided at the bottom of the transparent vacuum box 13, and a charge probe 7 is provided at the top of the charge sensor 8. The charge probe 7 cooperates with the charge sensor 8 to detect the charge signal of the pressured coal rock sample 5 for analyzing the received The charge change when the hydrogen bond of the loaded coal rock is broken; when the hydrogen bond of the loaded coal rock sample 5 is broken, a charge transfer is generated, and the charge probe 7 detects it, and the charge sensor 8 outputs the charge signal in real time and transmits it to the computer 14, so as to realize the Macroscopic induction test of hydrogen bond breakage in loaded coal rock sample 5. The transparent vacuum box 13 is provided with a bottom switch port 9, the bottom switch port 9 is connected to the channel 10, and the other end of the channel 10 is connected to the infrared spectrum analyzer 11. After the coal rock sample 5 is loaded and broken, it enters the infrared spectrum analyzer through the channel 10. 11 Carry out infrared radiation scanning analysis to realize the recovery and detection of the coal rock sample 5 . Infrared spectroscopy technology is the absorption spectrum caused by the vibrational energy level transition caused by the bonded atoms in the substance molecule absorbing infrared radiation. The infrared spectrum of organic matter can reflect its chemical structure characteristics. Different characteristic vibration frequencies (absorption peaks) show different presence of the group. Infrared Spectrum Analyzer 11 uses infrared spectroscopy to study the changes of hydroxyl hydrogen bonds in coal rocks. According to the changes in the transmittance of the spectral absorption band in coal rocks, it can be judged that the hydroxyl hydrogen bonds in coal rocks are in different states, and the analysis of coal rock hydroxyl hydrogen bonds The strength change of the hydrogen bond is judged, and the output of the spectral signal is transmitted to the computer 14, so as to realize the microscopic induction test of the hydrogen bond fracture of the loaded coal rock.

As shown in Figure 1, a heating rod 3 and a temperature sensor 12 are also arranged inside the transparent vacuum box 13, the heating rod 3 and the temperature sensor 12 are respectively connected with a computer 14, and the computer 14 controls the heating of the heating rod 3 and receives the temperature sensor 12. temperature signal.

In the present invention, the heating rod 3 cooperates with the temperature sensor 12 to analyze the influence of temperature on the hydrogen bond fracture of the loaded coal rock. Specifically, the upper end of the transparent vacuum box 13 is connected to the heating rod 3, and the heating is controlled by a computer 14 to simulate different temperatures. Under the influence of the hydrogen bond breakage, the temperature sensor 12 placed at the bottom of the vacuum box sends the corresponding temperature signal output to the computer 14 to realize the induction test of the hydrogen bond breakage of the loaded coal rock at different temperatures, and then realize the temperature Combined with the charge to judge the hydrogen bond breakage of the loaded coal rock sample 5, the data is more accurate and reliable, and has strong reference significance.

As shown in FIG. 2 , the pressure signal, charge signal, spectral signal and temperature signal are input into the computer 14 through the receiving module, filter, modulator, A/D converter and demodulator in sequence. After the pressure signal, the charge signal, the spectral signal and the temperature signal are input into the computer 14, the time-hydrogen bond spectrum-charge-pressure induction curve and the time-hydrogen bond spectrum-charge-temperature-pressure-sensing curve are obtained by data processing software such as Matlab software induction curve. Specifically, during the hydrogen bond fracture test of loaded coal rock at room temperature, the computer 14 transmits the signal to the filter through the receiving module for processing, encodes and modulates the analog signal through the modulator, and then converts the analog signal to It is a digital signal. After the digital signal is decoded and demodulated by the demodulator, the data is transmitted to the computer 14 through the transmitter, and the time-hydrogen bond is obtained through data processing by recording the spectral signal, the charge-induced digital signal and the corresponding time. Spectrum-charge-pressure induction curve, and then analyze the influence law on hydrogen bond breakage; or, during the test of hydrogen bond breakage of loaded coal rock during heating, the computer 14 transmits the signal to the filter through the receiving module for processing, and then passes the modulator Code and modulate the analog signal, and then convert the analog signal into a digital signal through A/D conversion. After the digital signal is decoded and demodulated by the demodulator, the data is transmitted to the computer 14 through the transmitter. , Charge induction digital signal, temperature digital signal and corresponding time are recorded, and after data processing, time-hydrogen bond spectrum-charge-temperature-pressure-induction curve is obtained, and then the influence law on hydrogen bond breaking is analyzed.

In this embodiment, the switch port 9 at the bottom is provided with a switch, and the switch is connected to the computer 14 , and the computer 14 controls the opening and closing of the switch port 9 at the bottom.

The transparent vacuum box 13 is provided with a pressure gauge 1 and a pressure release switch 2 . The pressure gauge 1 and the pressure relief switch 2 are placed on the transparent vacuum box 13, and the air pressure valve is connected inside. The pressure gauge 1 is used to observe the pressure inside the vacuum box during the test. After the test, the pressure relief switch 2 is turned on to release the transparent vacuum box. 13 internal pressure, so that the pressure inside and outside the box is consistent, the work is safe and reliable, and meets the requirements of the safety test.

The working process of the induction test device of the hydrogen bond fracture of the loaded coal rock of the present invention is as follows:

As shown in Figure 3, when the test starts, the computer 14 controls the transparent vacuum box 13 to start pumping and applying pressure, and simulates the deep downhole pressure state for the coal rock sample 5 placed inside the protective shell 4 with holes to apply pressure; at the same time, the electric charge The probe 7 starts working to detect the charge released by the loaded coal rock sample 5 due to hydrogen bond breakage; when the coal rock sample 5 breaks, the transparent vacuum box 13 stops the pressure application, and the charge signal is transmitted to the computer 14 through the charge sensor 8 Then, the bottom switch port 9 is opened, and the coal rock sample 5 enters the infrared spectrum analyzer 11 through the channel 10; the infrared spectrum analyzer 11 uses infrared spectroscopy to study the change of the hydroxyl hydrogen bond of the coal rock, and according to the spectral absorption in the coal rock With the change of transmittance, it can be judged that the hydroxyl hydrogen bonds of the coal rock are in different states, and the strength change of the hydroxyl hydrogen bonds of the coal rock can be analyzed to determine the state of hydrogen bond breakage, and the spectral signal is also output to the computer 14 to obtain the time— Hydrogen bond spectrum - charge - pressure response curve;

Hydrogen bond breaking is not only accompanied by charge release, but also energy change. Hydrogen bond breaking needs to absorb energy. When the downhole temperature is different or the downhole equipment generates heat, it will affect the degree and rate of hydrogen bond breaking in the loaded coal rock. To achieve To determine the influence of different temperatures on the hydrogen bond breakage of the loaded coal rock sample 5, introduce a heating device;

As shown in Figure 4, when the test starts, the computer 14 controls the heating rod 3 to start working to heat the test device; at the same time, the computer 14 controls the transparent vacuum box 13 to start pumping and applying pressure to simulate the coal rock sample 5 under load. pressure; the charge probe 7 starts to work, and detects the electric charge produced by the loaded coal rock sample 5 due to hydrogen bond rupture after detection, and the temperature sensor 12 is also opened to detect the temperature of the test device; after the coal rock sample 5 is broken, the transparent vacuum box 13 Stop the pressure work, the charge sensor 8 sends the charge signal to the computer 14, and the temperature sensor 12 sends the temperature signal to the computer 14; then, the bottom switch port 9 is opened, and the coal rock sample 5 is sent to the infrared spectrometer through the channel 10 In 11, the infrared spectrum analyzer 11 uses infrared spectroscopy technology to study the change of hydroxyl hydrogen bonds in coal rocks. According to the changes in the transmittance of the spectral absorption band in coal rocks, it can be judged that the hydroxyl hydrogen bonds of coal rocks are in different states, and the coal rocks can be analyzed. Changes in the strength of the hydrogen bond of the hydroxyl group determine the state of the hydrogen bond breaking, and the infrared spectrometer 11 transmits the spectral signal to the computer 14 to obtain a time-hydrogen bond spectrum-charge-temperature-pressure-sensing curve.

After the test is over, the internal and external pressure of the device is balanced through the pressure relief switch 2, and the test work is safe and reliable.

In the present invention, the rupture of the coal rock sample 5 can be observed by the test personnel, and the computer 14 records the pressure data of the vacuum box in real time.

When the present invention is used in practice, the computer 14 can adjust the pressure and speed of the transparent vacuum box 13 to pump air and pressurize as needed, and carry out multiple tests, so as to be more in line with the actual situation of on-site work; the computer 14 can also control the opening of the heating rod 3 at the same time , adjust the heating temperature and speed according to the needs, and carry out multiple tests. Hydrogen bond breakage needs to absorb energy. and temperature control, adjust the pumping speed of the transparent vacuum box 13 and the heating temperature of the heating rod 3 according to the needs, and conduct multiple tests. The test is completed according to the change of the transmittance of the spectral absorption band, the charge induction and the temperature change during the coal rock fracture process , by receiving multiple signals and sorting out, the time-hydrogen bond spectrum-charge-temperature-pressure curve can be finally obtained, and then the microscopic and macroscopic analysis of the influence on the hydrogen bond breaking law, after many tests, the data is true and reliable; The rules and influencing factors obtained from the experiment provide reference value for the deep underground work system and prevention, which not only protects the safety of the underground equipment, but also protects the safety of the on-site workers, which is beneficial to the protection work of the deep underground.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications, substitutions and modifications can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the invention is defined by the claims and their equivalents.

Claims (3)

1. An induction test device for hydrogen bond fracture of loaded coal rock, characterized in that it includes a base and a charge sensor arranged inside the transparent vacuum box, and an infrared spectrum analyzer and a computer arranged outside the transparent vacuum box; The base is provided with a protective casing with holes, and the protective casing with holes is used to cover coal and rock samples; The bottom of the transparent vacuum box is provided with a bottom switch port, and the bottom switch port communicates with the infrared spectrum analyzer through a channel, so that the cracked coal rock sample enters the infrared spectrum analyzer from the transparent vacuum box; the transparent vacuum A heating rod and a temperature sensor are also arranged inside the box, and the heating rod and the temperature sensor are respectively connected to the computer, and the computer controls the heating of the heating rod and receives the temperature signal from the temperature sensor; The top of the charge sensor is provided with a charge probe for detecting charge signals; The computer is respectively connected with the transparent vacuum box, the charge sensor and the infrared spectrum analyzer, and the computer controls the transparent vacuum box to apply pressure to the coal rock sample, and receives the pressure signal of the transparent vacuum box, the charge signal of the charge sensor and the infrared spectrum analyzer. Spectral signal; the pressure signal, charge signal, spectral signal and temperature signal are input into the computer through the receiving module, filter, modulator, A/D converter and demodulator in sequence. 2 . The induction test device for hydrogen bond fracture of loaded coal rock according to claim 1 , characterized in that, the bottom opening is provided with a switch, the switch is connected to a computer, and the computer controls the opening and closing of the bottom opening. 3. The induction test device for hydrogen bond fracture of loaded coal rock according to claim 1, characterized in that the transparent vacuum box is provided with a pressure gauge and a pressure relief switch.

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