Coal body surface friction heat effect testing device and testing method

Abstract

The invention discloses a coal body surface friction heat effect testing device and a testing method. Comprising a placing platform (3) and a baffle rail system for providing a horizontal moving rail for a coal sample, the test loading control system is used for controlling the horizontal pressure and the axial pressure of the coal sample; the infrared data acquisition system is used for realizing non-contact observation of the surface infrared radiation temperature of the coal sample in the friction process and recording the surface temperature change data of the coal sample in real time; the test loading control system and the baffle rail system are arranged on the placing platform (3); the device has the beneficial effects that in order to measure the friction heat effect of the coal body, different composition plates and I-shaped rails are adopted, and the device for simulating the friction process of the surface of the coal body under different pressures and different loading speeds is designed. And observing the infrared temperature radiation characteristics of the surface of the coal body in the friction process to analyze the temperature change rule of the friction heat effect of the coal body under different influence factors.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal mining, in particular to a coal surface friction heat effect testing device and testing method. BACKGROUND

[0002] The main factors causing temperature change of coal body in the process of coal and gas outburst include adsorption / desorption heat effect, coal body friction heat effect, gas expansion heat effect, deformation heat effect, etc. Coal and gas outburst is an extremely complex process of multi-field coupling, and the temperature change of coal body affects the evolution characteristics of stress field and seepage field, and further changes the gas migration law of coal seam. Accurately describing the temperature change law caused by coal particle friction in the process of coal and gas outburst is a key scientific problem to reveal the mechanism of coal and gas outburst. Therefore, it is urgent to research a coal surface friction heat effect testing device and testing method to quantitatively study the temperature change law caused by coal friction under different horizontal pressures and loading speeds. SUMMARY

[0003] The present application aims to provide a coal surface friction heat effect testing device and testing method. The infrared temperature influence and change law of coal friction under different loading speeds and different pressures are studied to solve the above-mentioned problems of the prior art.

[0004] To achieve the above-mentioned purpose, the present application provides the following scheme: including a placement platform, a baffle track system for providing a horizontal moving track for the coal sample, a test loading control system for controlling the horizontal direction pressure and axial pressure of the coal sample, and an infrared data acquisition system for realizing non-contact observation of the surface infrared radiation temperature of the coal sample during friction process and real-time recording of the temperature change data of the coal sample surface; the test loading control system and the baffle track system are both arranged on the placement platform.

[0005] Preferably, the baffle track system includes a U-shaped baffle, a fixed baffle, an L-shaped sliding plate and an I-shaped track arranged on the placement platform respectively; the U-shaped baffle is internally provided with a sample base plate, the first coal sample is placed on the sample base plate, and a vertical first electric cylinder loader for transmitting the vertical loading speed is connected to the lower surface of the sample base plate; the L-shaped sliding plate and the I-shaped track are combined to form a horizontal sliding track for horizontal movement of the second coal sample, the second coal sample is placed on the inner side of the L-shaped sliding plate, a horizontal second electric cylinder loader for transmitting the horizontal pressure is connected to the outer side of the L-shaped sliding plate, and the fixed baffle is arranged on both sides of the L-shaped sliding plate.

[0006] Preferably, the test loading control system comprises a first computer, an electric cylinder controller, a horizontal loading device and a vertical loading device, the first computer is connected with the electric cylinder controller, the electric cylinder controller is connected with the horizontal loading device and the vertical loading device respectively, the vertical loading device comprises a first electric cylinder loader, a first transmission device and a first sensing line connected in sequence; the horizontal loading device comprises a second electric cylinder loader, a second transmission device and a second sensing line connected in sequence; the first transmission device and the second transmission device drive the first electric cylinder loader and the second electric cylinder loader to move respectively; the first transmission device and the second transmission device are connected with the electric cylinder controller through the first sensing line and the second sensing line respectively, and the required pressure, loading speed and loading displacement are adjusted through the electric cylinder controller.

[0007] Preferably, the infrared data acquisition system comprises an infrared thermal imager, an infrared data collector and a second computer connected in sequence, the infrared thermal imager is used to observe the infrared radiation temperature of the surface of the first coal sample in real time during the friction process of the first coal sample and the second coal sample, the infrared data collector collects the information of the infrared thermal imager and transmits it to the second computer for data analysis.

[0008] Preferably, the U-shaped baffle is connected with the protruding fixed shear-resistant screw on the placement platform, and is fixed on the placement platform by a hexagonal bolt, and a stiffening rib plate is welded on the side surface of the U-shaped baffle to improve the rigidity and strength.

[0009] Preferably, a circular hole is formed in the placement platform below the test sample backing plate, which is used for the first electric cylinder loader to contact the test sample backing plate and transmit the thrust.

[0010] Preferably, the friction coefficient between the I-shaped rail and the L-shaped slide plate is much smaller than the friction coefficient when the second coal sample is directly placed on the placement platform.

[0011] Preferably, the first coal sample and the second coal sample are both cuboid standard coal samples with the same size and volume, the length of the second coal sample is greater than the length of the bottom of the L-shaped slide plate, and the width of the second coal sample is less than the width of the bottom of the L-shaped slide plate.

[0012] Preferably, the second electric cylinder loader is provided with a second device fixing plate, the first electric cylinder loader is provided with a first device fixing plate, and the first device fixing plate and the second device fixing plate are both attached with a matching seat hole.

[0013] A test method of a coal surface friction heat effect testing device, comprising the following steps:

[0014] Step S1. Prepare a plurality of ordinary cuboid standard coal samples;

[0015] Step S2. Install the U-shaped baffle on the placing platform, fix it, place the first coal sample on the sample pad in the U-shaped baffle, then install the fixed baffle on the placing platform and fix it, assemble the L-shaped slide plate on the I-shaped track, and place the second coal sample on the inner side of the L-shaped slide plate; place the second electric cylinder loader on the outer side of the L-shaped slide plate, and place the first electric cylinder loader below the sample pad;

[0016] Step S3. Set a certain pressure to the second electric cylinder loader horizontally, and after the pressure is stable, set a certain loading speed to the first electric cylinder loader vertically; turn on the infrared thermal imager, and observe the infrared radiation temperature of the first coal sample surface in the friction process of the first coal sample and the second coal sample in real time; the infrared data collector collects the information of the infrared thermal imager and transmits it to the second computer for data analysis.

[0017] After the vertical first electric cylinder loader moves a distance to the fixed position, the horizontal second electric cylinder loader and the vertical first electric cylinder loader stop working, and stand still for a period of time to dissipate the residual heat, and restore all devices to the initial position, and the coal body friction heat effect determination experiment is completed once;

[0018] Step S4. Change the loading speed of the vertical first electric cylinder loader in S3, repeat step S3, and the friction heat effect determination experiment of the first coal sample under the same horizontal pressure and different loading speeds is completed;

[0019] Step S5. Change the horizontal pressure of the second electric cylinder loader in S3, repeat S3, and the friction heat effect determination experiment of the first coal sample under the same loading speed and different horizontal pressures is completed;

[0020] Step S6. Record the surface temperature data of the first coal sample under different horizontal pressures and loading speeds through the infrared data acquisition system, and analyze the infrared temperature change rule of the friction heat effect process of the first coal sample under different pressures and different loading speeds.

[0021] The beneficial effects of the present application are: in order to determine the friction heat effect of coal body, different combination plates and I-shaped tracks are used, and a device for simulating the friction process of the surface of coal body under different pressures and different loading speeds is designed. The infrared temperature radiation characteristics of the surface of coal body in the friction process are observed to analyze the temperature change rule of the friction heat effect of coal body under different influencing factors. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0023] Figure 1 It is the whole structure schematic view of the present application;

[0024] Figure 2 It is the whole structure plan view of the present application;

[0025] Figure 3 It is the whole structure longitudinal section schematic view of the present application;

[0026] Figure 4 From left to right, they are L-shaped slide structure view, L-shaped slide front view, I-shaped track structure view.

[0027] Among them, 1, first device fixing plate;2, first transmission;3, placing platform;4, fixed shear screw;5, hexagonal bolt;6, sample backing plate;7, fixed baffle;8, L-shaped slide;9, second electric cylinder loader;10, second device fixing plate;11, second transmission;12, second sensing line;13, first sensing line;14, first coal sample;15, second coal sample;16, infrared thermal imager;17, infrared data collector;18, second computer;19, electric cylinder controller;20, first computer;21, I-shaped track;22, U-shaped baffle;23, first electric cylinder loader;24, reinforcing rib plate. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the protection scope of the present application.

[0029] In order to make the above objectives, characteristics and advantages of the present application more apparent, further detailed description will be made to the present application with reference to the drawings and specific embodiments.

[0030] Reference Figures 1-4 The present application is a kind of coal surface friction heat effect testing device, including baffle track system for providing horizontal moving track for coal sample, test loading control system for controlling horizontal direction pressure and axial pressure of coal sample and infrared data acquisition system etc. The baffle track system is used for loading and fixing and moving coal sample;The test loading control system is used for controlling the horizontal direction pressure of coal sample and constant loading speed;The infrared data acquisition system is used for realizing non-contact observation of coal sample friction process surface infrared radiation temperature, and real-time recording of coal sample surface temperature change data.

[0031] The baffle rail system is composed of U-shaped baffle 22, fixed baffle 7, L-shaped slide plate 8, I-shaped rail 21. The U-shaped baffle 22 is connected with the protruding fixed shear screw 4 on the placing platform 3, and is fixed on the placing platform 3 by the hexagonal bolt 5. The sample pad 6 built-in the U-shaped baffle 22 places the first coal sample 14 on the top, and is connected with the vertical first electric cylinder loader 23 on the bottom, which is used for transmitting the vertical loading speed. The L-shaped slide plate 8 is combined with the I-shaped rail 21 on the placing platform 3 to form a horizontal sliding rail, which is used for the horizontal movement of the second coal sample 15. The second coal sample 15 is placed on the inner side of the L-shaped slide plate 8, and the horizontal second electric cylinder loader 9 is connected on the outer side, which is used for transmitting the horizontal pressure. The fixed baffle 7 is arranged on both sides of the L-shaped slide plate 8.

[0032] Further optimization scheme, the left side of the U-shaped baffle 22 in the baffle rail system is welded with a reinforcing rib plate 24 to improve the rigidity and strength of the U-shaped baffle 22. Further optimization scheme, the placing platform 3 below the sample pad 6 is opened with a circular hole, which is used for the vertical first electric cylinder loader 23 to contact with the sample pad 6 to transmit the thrust. Further optimization scheme, in order to reduce the influence of friction on the horizontal pressure, the friction coefficient between the I-shaped rail 21 and the L-shaped slide plate 8 is much smaller than the friction coefficient of the second coal sample 15 directly placed on the placing platform 3. Further optimization scheme, the first coal sample 14 and the second coal sample 15 are both cuboid standard size coal samples with the same size and volume. The length of the second coal sample 15 is greater than the length of the bottom of the L-shaped slide plate 8, so that the first coal sample 14 and the second coal sample 15 can be in contact and extrusion, preventing the first coal sample 14 from contacting the bottom of the L-shaped slide plate 8 first, and ensuring that the first coal sample 14 and the second coal sample 15 can be completely under the pressure applied by the horizontal loading second electric cylinder loader 9.

[0033] The test loading control system includes a first computer 20, an electric cylinder controller 19, a horizontal loading device and a vertical loading device. The first computer 20 is connected with the electric cylinder controller 19. The electric cylinder controller 19 is connected with the horizontal loading device and the vertical loading device respectively. The vertical loading device includes a first electric cylinder loader 23, a first driver 2 and a first sensing line 13 connected in sequence. The horizontal loading device includes a second electric cylinder loader 9, a second driver 11 and a second sensing line 12 connected in sequence. The first driver 2 and the second driver 11 drive the first electric cylinder loader 23 and the second electric cylinder loader 9 to move respectively. The first driver 2 and the second driver 11 are connected with the electric cylinder controller 19 through the first sensing line 13 and the second sensing line 12 respectively, and the required pressure, loading speed and loading displacement are adjusted through the electric cylinder controller 19.

[0034] Further optimization scheme, the first device fixed plate 1 and the second device fixed plate 10 are all attached with matching seat holes, so that the loading device can be installed and fixed on it.

[0035] The infrared data acquisition system is composed of an infrared thermal imager 16, an infrared data collector 17 and a second computer 18.

[0036] A testing method of a coal surface friction heat effect testing device, comprising the following steps:

[0037] Step S1. Prepare several ordinary cuboid standard coal samples;

[0038] Step S2. Install the U-shaped baffle 22 on the placement platform 3 and fix it, place the first coal sample 14 on the sample pad 6 inside the U-shaped baffle 22, then install the fixed baffle 7 on the placement platform 3 and fix it, assemble the L-shaped slide plate 8 on the I-shaped track 21, place the second coal sample 15 on the inside of the L-shaped slide plate 8, place the second electric cylinder loader 9 on the outside of the L-shaped slide plate 8, and place the first electric cylinder loader 23 below the sample pad 6;

[0039] Step S3. Set a certain pressure to the horizontal second electric cylinder loader 9, and after the pressure is stable, set a certain loading speed to the vertical first electric cylinder loader 23, turn on the infrared thermal imager 16, and observe the infrared radiation temperature of the surface of the first coal sample 14 in real time during the friction process of the first coal sample 14 and the second coal sample 15, the infrared data collector 17 collects the information of the infrared thermal imager 16 and transmits it to the second computer 18 for data analysis;

[0040] After the vertical first electric cylinder loader 23 moves a certain distance to the fixed position, the horizontal second electric cylinder loader 9 and the vertical first electric cylinder loader 23 stop working, and stand still for a period of time to dissipate the residual heat, and restore all devices to the initial position, and the coal friction heat effect determination experiment is completed;

[0041] Step S4. Study the speed influence: change the loading speed of the vertical first electric cylinder loader 23 in S3, repeat step S3, and complete the friction heat effect determination experiment of the first coal sample 14 under the same horizontal pressure and different loading speeds;

[0042] Step S5. Study the pressure influence: change the horizontal pressure of the horizontal second electric cylinder loader 9 in S3, repeat S3, and complete the friction heat effect determination experiment of the first coal sample 14 under the same loading speed and different horizontal pressures;

[0043] Step S6. Record the surface temperature data of the first coal sample 14 at different levels of pressure and loading speed through the infrared data acquisition system, and analyze the infrared temperature variation law of the first coal sample 14 in the friction heat effect process under different pressures and different loading speeds.

[0044] It should be noted that after the completion of one experiment, all the devices need to be restored, and after a period of time, the residual heat is dissipated before the next experiment is performed.

[0045] In the description of the present application, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0046] The above-described embodiments are only descriptions of the preferred modes of the present application, and do not limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements to the technical solutions of the present application made by those skilled in the art shall fall within the protection scope determined by the claims of the present application.

Claims

1. A device for testing the frictional heat effect on the surface of coal, characterized in that: It includes a placement platform (3), a baffle track system for providing a horizontal moving track for the coal sample, a test loading control system for controlling the horizontal and axial pressure of the coal sample, and an infrared data acquisition system for realizing non-contact observation of the surface infrared radiation temperature of the coal sample during the friction process and recording the surface temperature change data of the coal sample in real time. The test loading control system and the baffle track system are both set on the placement platform (3).

2. The device for testing the frictional heat effect on the surface of coal as described in claim 1, characterized in that: The baffle track system includes a U-shaped baffle (22), a fixed baffle (7), an L-shaped sliding plate (8), and an I-shaped track (21) respectively set on the placement platform (3); the U-shaped baffle (22) has a built-in sample pad (6), on which a first coal sample (14) is placed, and a vertical first electric cylinder loader (23) for transmitting vertical loading speed is connected below the sample pad (6); the L-shaped sliding plate (8) and the I-shaped track (21) are combined to form a horizontal sliding track for the horizontal movement of a second coal sample (15), the second coal sample (15) is placed on the inner side of the L-shaped sliding plate (8), and a horizontal second electric cylinder loader (9) for transmitting horizontal pressure is connected on the outer side, and fixed baffles (7) are set on both sides of the L-shaped sliding plate (8).

3. The device for testing the frictional heat effect on the surface of coal as described in claim 1, characterized in that: The test loading control system includes a first computer (20), an electric cylinder controller (19), a horizontal loading device, and a vertical loading device. The first computer (20) is connected to the electric cylinder controller (19), which is connected to the horizontal loading device and the vertical loading device respectively. The vertical loading device includes a first electric cylinder loader (23), a first transmission device (2), and a first sensor line (13) connected in sequence. The horizontal loading device includes a second electric cylinder loader (9), a second transmission device (11), and a second sensor line (12) connected in sequence. The first transmission device (2) and the second transmission device (11) drive the first electric cylinder loader (23) and the second electric cylinder loader (9) to move respectively. The first transmission device (2) and the second transmission device (11) are connected to the electric cylinder controller (19) through the first sensor line (13) and the second sensor line (12) respectively. The electric cylinder controller (19) adjusts the required pressure, loading speed, and loading displacement.

4. The device for testing the frictional heat effect on the surface of coal as described in claim 1, characterized in that: The infrared data acquisition system includes an infrared thermal imager (16), an infrared data collector (17), and a second computer (18) connected in sequence. The infrared thermal imager (16) observes the infrared radiation temperature of the surface of the first coal sample (14) and the second coal sample (15) in real time during the friction process. The infrared data collector (17) collects the information from the infrared thermal imager (16) and transmits it to the second computer (18) for data analysis.

5. The coal surface frictional heat effect testing device according to claim 2, characterized in that: The U-shaped baffle (22) is connected to the protruding fixed shear screw (4) on the placement platform (3) and is fixed to the placement platform (3) by hexagonal bolts (5). The side of the U-shaped baffle (22) is welded with reinforcing ribs (24) to improve rigidity and strength.

6. The coal surface frictional heat effect testing device according to claim 2, characterized in that: The placement platform (3) below the sample pad (6) has a circular hole for the first electric cylinder loader (23) to contact the sample pad (6) and transmit thrust.

7. The coal surface frictional heat effect testing device according to claim 2, characterized in that: The coefficient of friction between the I-shaped track (21) and the L-shaped sliding plate (8) is much smaller than the coefficient of friction when the second coal sample (15) is placed directly on the placement platform (3).

8. The coal surface frictional heat effect testing device according to claim 2, characterized in that: The first coal sample (14) and the second coal sample (15) are both standard-sized cuboid coal samples with the same size and volume. The length of the second coal sample (15) is greater than the bottom length of the L-shaped slide plate (8), and the width of the second coal sample (15) is less than the bottom width of the L-shaped slide plate (8).

9. The coal surface frictional heat effect testing device according to claim 2, characterized in that: The second electric cylinder loader (9) is provided with a second device fixing plate (10) at the bottom, and the first electric cylinder loader (23) is provided with a first device fixing plate (1) at the bottom. Both the first device fixing plate (1) and the second device fixing plate (10) are provided with mating seat holes.

10. A testing method for the coal surface frictional heat effect testing device according to any one of claims 2 to 9, characterized in that: Includes the following steps: Step S1. Prepare several ordinary rectangular standard coal samples; Step S2. Install the U-shaped baffle (22) on the placement platform (3) and fix it. Place the first coal sample (14) on the sample pad (6) built into the U-shaped baffle (22). Then install the fixing baffle (7) on the placement platform (3) and fix it. Assemble the L-shaped slide plate (8) on the I-shaped track (21) and place the second coal sample (15) on the inside of the L-shaped slide plate (8). Place the second electric cylinder loader (9) on the outside of the L-shaped slide plate (8) and place the first electric cylinder loader (23) below the sample pad (6). Step S3. Set a certain pressure on the horizontal second electric cylinder loader (9). After the pressure stabilizes, set a certain loading speed on the vertical first electric cylinder loader (23). Turn on the infrared thermal imager (16) to observe the infrared radiation temperature of the surface of the first coal sample (14) and the second coal sample (15) in real time during the friction process. The infrared data collector (17) collects the information from the infrared thermal imager (16) and transmits it to the second computer (18) for data analysis. After the vertical first electric cylinder loader (23) moves vertically a certain distance to a fixed position, the horizontal second electric cylinder loader (9) and the vertical first electric cylinder loader (23) stop working, stand still for a period of time to dissipate residual heat, restore all devices to the initial position, and the coal friction heat effect measurement experiment is completed. Step S4. Change the loading speed of the vertical first electric cylinder loader (23) in S3, repeat step S3, and the frictional heat effect determination experiment of the first coal sample (14) under the same horizontal pressure and different loading speeds is completed. Step S5. Change the horizontal pressure of the second electric cylinder loader (9) in S3, repeat S3, and the frictional heat effect determination experiment of the first coal sample (14) under the same loading speed and different horizontal pressure is completed; Step S6. Record the surface temperature data of the first coal sample (14) under different pressures and loading speeds using an infrared data acquisition system, and analyze the infrared temperature variation law of the frictional heat effect process of the first coal sample (14) under different pressures and loading speeds.

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