CN209927847U - Simulation experiment system for breaking coal containing gas by impact ground pressure - Google Patents
Simulation experiment system for breaking coal containing gas by impact ground pressure Download PDFInfo
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- CN209927847U CN209927847U CN201920785678.3U CN201920785678U CN209927847U CN 209927847 U CN209927847 U CN 209927847U CN 201920785678 U CN201920785678 U CN 201920785678U CN 209927847 U CN209927847 U CN 209927847U
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Abstract
The utility model discloses a simulation experiment system for crushing gassy coal by impact, which comprises an electromagnetic booster mechanism, a hydraulic pump station, an axial compression device and a coal sample storage device; the hydraulic pump station provides the hydraulic oil that is used for producing the confined pressure for coal sample strorage device, and hydraulic pump station provides the hydraulic oil that is used for producing the axle load for the axle load device, and hydraulic pump station provides the hydraulic oil that is used for the pressure boost for electromagnetism booster mechanism, and electromagnetism booster mechanism provides the hydraulic oil that is used for simulating the rock burst for the axle load device, and the axle load device provides the impact force of rock burst for coal sample strorage device. The utility model discloses need not promote the heavy object, the pressure that can release is bigger and easily accurate size of adjusting the impact force, and the speed of release impact force is faster, makes the utility model discloses can carry out the broken gas coal containing simulation experiment of rock burst more close actual conditions ground, be convenient for adjust moreover and enclose pressure axle load and impact force, be suitable for and carry out the simulation experiment under the different conditions fast many times.
Description
Technical Field
The utility model relates to a coal petrography engineering experimental facilities technical field especially relates to a broken coal containing gas simulation experiment system and corresponding broken coal experimental method of impacting.
Background
Rock burst is a phenomenon that elastic strain energy gathered in coal and rock mass is rapidly and violently released under a certain condition, so that the coal and rock mass is cracked and thrown outwards.
When rock burst occurs, the underground tunnel is extruded and contracted, even blocked, and the safety production of the coal mine is seriously influenced. The occurrence of rock burst is instantaneous, the important point of work for controlling rock burst is disaster prediction, and the research on a triggering mechanism of rock burst and a rock burst failure mechanism of coal bodies during the occurrence of rock burst has important theoretical value and engineering guidance significance.
Some simulation experiment systems for crushing coal containing gas in an impact ground have appeared in the field, and the existing coal crushing system and coal crushing experiment method rely on gravitational potential energy, and the impact potential energy caused by falling of a heavy object is used as an energy source for simulating the impact ground. This technique has the following drawbacks:
1. the weight can be lifted to a sufficient height to have sufficient impact force, so that the conventional simulation system is large in size and high in height.
2. When the simulation experiment is carried out, heavy objects need to be lifted, the labor intensity of manual lifting is high, lifting equipment needs to be arranged in a matched manner in mechanical lifting, and the cost is high; the lifted weight needs to be accurately aligned with a preset smashing landing point below.
3. The weight falls down in a process requiring a slow impact speed. When a weight is dropped, a danger may occur if a person or an instrument passes under the weight.
4. The impact force is not easy to adjust; when the impact force is adjusted, the volume of the weight can be changed, the adaptability of the weight and the lower stress device can be changed, and the actual impact pressure can generate errors. When the weight is not sufficiently fitted to the underlying force-bearing device, the weight or force-bearing device may spring in an unpredictable direction, creating a hazard.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned defect, provide an impact ground that electromagnetic force, elasticity and hydraulic pressure force combined together and crush the simulation experiment system that contains gas coal, small, easy and simple to handle, the pressure that provides is accurate, and operation safety improves simulation experiment's efficiency.
In order to realize the purpose, the simulation experiment system for crushing the gassy coal in an impact way comprises an electromagnetic supercharging mechanism, a hydraulic pump station, a shaft pressing device and a coal sample storage device; the hydraulic pump station provides the hydraulic oil that is used for producing the confined pressure for coal sample strorage device, and hydraulic pump station provides the hydraulic oil that is used for producing the axle load for the axle load device, and hydraulic pump station provides the hydraulic oil that is used for the pressure boost for electromagnetism booster mechanism, and electromagnetism booster mechanism provides the hydraulic oil that is used for simulating the rock burst for the axle load device, and the axle load device provides the pressure that is used for simulating the rock burst for coal sample strorage device.
The device also comprises a gas adsorption and desorption device; the gas adsorption and desorption device is used for adsorbing and desorbing gas in a coal sample.
The electromagnetic supercharging mechanism comprises a first rack, the first rack comprises a first base and a first top plate, a first hydraulic cylinder is arranged on the first base, the inner cavity wall of the first hydraulic cylinder is connected with a first piston in a sealing and sliding mode, the first piston is horizontally arranged, a steel sliding block is loaded on the upper surface of the first piston, a through sliding hole is formed in the top wall of the first hydraulic cylinder, and the steel sliding block extends out of the sliding hole upwards; a pressurizing hydraulic cavity is formed by the first piston and the inner cavity wall of the first hydraulic cylinder below the first piston;
the first top plate is fixedly connected with an electromagnetic chuck, and the electromagnetic chuck is connected with an electric control device through a connecting circuit; the electromagnetic chuck is downwards connected with a spring set, and the spring set comprises a plurality of high-strength springs; the lower end of each high-strength spring is connected with an iron sucker which is positioned right above the steel slide block; when the high-strength springs are in a relaxation state and the pressurizing hydraulic cavity is filled with oil, the iron sucker is in compression joint with the steel sliding block, and when the high-strength springs are in a compression state, the iron sucker is separated from the steel sliding block;
the pressurizing hydraulic cavity is connected with a first liquid inlet pipe and a first liquid outlet pipe, the first liquid inlet pipe is used for supplying hydraulic oil to the pressurizing hydraulic cavity, and the first liquid outlet pipe is used for allowing the hydraulic oil in the pressurizing hydraulic cavity to flow out; a first valve is arranged on the first liquid inlet pipe, and a one-way valve is arranged on the first liquid outlet pipe; the first liquid inlet pipe and the first liquid outlet pipe are both connected with a first pipeline, and the first pipeline is connected with a shaft pressing device; the one-way opening direction of the one-way valve is from the pressurizing hydraulic cavity to the first pipeline.
The wall of the sliding hole is evenly embedded with a plurality of balls at intervals, and the side wall of the steel sliding block is matched with the balls in a rolling manner.
The coal sample storage device comprises a second base, the second base is upwards connected with a lower hydraulic cylinder, the lower hydraulic cylinder is vertically arranged, the bottom of an inner cavity of the lower hydraulic cylinder is provided with a steel pore plate, a plurality of micropores for gas to pass through are uniformly distributed on the steel pore plate, and the diameter of each micropore is less than or equal to 0.1 mm;
the lower hydraulic cylinder is upwards connected with an annular steel plate through a bolt; the hole wall of the central hole of the annular steel plate is connected with a first sealing rubber cylinder, a cylindrical steel cushion block is tightly pressed in the first sealing rubber cylinder, the upper surface of the steel cushion block is flush with the upper surface of the annular steel plate, and the lower surface of the steel cushion block is flush with the lower surface of the annular steel plate;
an annular sealing rubber sleeve is arranged in the inner cavity of the lower hydraulic cylinder, the cylinder bottom of the annular sealing rubber sleeve is connected with a steel pore plate, the annular sealing rubber sleeve is provided with an inner cavity and the inner cavity of the annular sealing rubber sleeve is used as a confining pressure cavity, and a central hole surrounded by the annular sealing rubber sleeve is used as a coal sample cavity for containing a coal sample; the upper end of the coal sample cavity is connected with a steel cushion block, and the lower end of the coal sample cavity is connected with a steel pore plate;
the circumferential outer wall of the annular sealing rubber sleeve is connected with the inner wall of the lower hydraulic cylinder; the top of the annular sealing rubber sleeve is connected with the annular steel plate and the first sealing rubber cylinder; the inner cavity of the annular sealing rubber sleeve is used as a confining pressure cavity which is connected with a fourth pipeline, and the fourth pipeline is connected with a hydraulic pump station;
the gas adsorption and analysis device comprises a high-pressure gas bottle, the high-pressure gas bottle is connected with a gas supply pipeline, and a gas supply valve, a pressure gauge and a first flowmeter are arranged on the gas supply pipeline; a gas supply hole and a gas analysis hole are formed in the second base and are communicated with each other; the gas supply hole is connected with the steel orifice plate, and the gas supply pipeline extends into the gas supply hole and is connected with the steel orifice plate; the gas supply hole is connected with a gas analysis pipeline, the gas analysis pipeline extends into the gas supply hole and is communicated with the gas supply pipeline, the gas analysis pipeline extends out of the second base, and a second flowmeter and a gas analysis valve are arranged on the gas analysis pipeline.
The outer wall of the lower hydraulic cylinder is fixedly connected with an installation frame; the mounting frame extends upwards and is connected with a second top plate;
the second top plate is downwards connected with an upper hydraulic cylinder through a bolt, the inner cavity wall of the upper hydraulic cylinder is connected with a third sealing rubber cylinder, and the top of the third sealing rubber cylinder extends out of the upper hydraulic cylinder and is tightly pressed between the second top plate and the upper hydraulic cylinder; the inner wall of the third sealing rubber cylinder is connected with a second piston in a sliding manner, and the second piston is fixedly connected with a piston rod downwards; the upper hydraulic cylinder is provided with a bottom wall, a through hole is formed in the center of the bottom wall of the upper hydraulic cylinder, and the bottom of the third sealing rubber cylinder extends into the through hole and is fixedly connected with the wall of the through hole; the piston rod extends out of a through hole in the bottom wall of the upper hydraulic cylinder through the third sealing rubber cylinder, and the piston rod is in sliding sealing fit with the third sealing rubber cylinder in the through hole; the second piston, a third sealing rubber cylinder above the second piston and the second top plate enclose an axial pressure cavity, and the second piston and a third sealing rubber cylinder below the second piston enclose an oil return cavity; the bottom of the oil return oil cavity is connected with a third pipeline, and the third pipeline extends out of a third sealing rubber cylinder and an upper hydraulic cylinder to be connected with a hydraulic pump station; the axial pressure cavity is connected with a first pipeline and a second pipeline, and the first pipeline extends out of the second top plate and is connected with the first liquid inlet pipe and the first liquid outlet pipe; the second pipeline extends out of the second top plate and is connected with the hydraulic pump station.
The bottom surface of the piston rod is provided with a film pressure sensor which is connected with the electric control device; and a second valve is arranged at the joint of the hydraulic pump station and the second pipeline, a third valve is arranged at the joint of the hydraulic pump station and the third pipeline, and a fourth valve is arranged at the joint of the hydraulic pump station and the fourth pipeline.
The utility model discloses have following advantage:
the utility model discloses an electromagnetism booster mechanism no longer need promote the heavy object and produce the impact force, consequently need not heavy object hoisting device, need not provide the space for the heavy object whereabouts, has reduced the broken volume and the height that contain gas coal simulation experiment system of rock burst greatly.
The utility model does not need to lift heavy objects during the experiment, thereby reducing the operation intensity; the cost is reduced without a heavy object lifting device, the danger caused by falling of the heavy object is avoided, the energy storage size of the spring group can be conveniently adjusted by replacing different high-strength springs and electromagnetic chucks, and the size of the simulated impact force can be conveniently adjusted. When the impact force is adjusted, the adaptability of the impact mechanism cannot be changed due to the change of the volume of the weight.
When impact is simulated, hydraulic oil in the pressurizing hydraulic cavity does not need to flow out in a large quantity, and as long as the first piston slightly compresses the pressurizing hydraulic cavity downwards, the great impact pressure can be transmitted to the second piston in an oil pressure mode. The compression and the release of the spring group are both limited in the electromagnetic pressurization mechanism, the movement range is very small, and the danger to the outside is difficult to cause.
The electromagnetic supercharging mechanism has simple structure, and each high-strength spring is controlled to be in a compressed state and accumulate strong elastic potential energy when the electromagnetic chuck adsorbs the iron sucker through the electric control device; the magnitude of the elastic potential energy can be adjusted by adjusting the suction force of the electromagnetic chuck (such as replacing electromagnetic chucks of different models or supplying different voltage currents to the same electromagnetic chuck) and adjusting the magnitude of the elastic force of the high-strength spring (such as replacing the high-strength spring with elastic force adaptation, wherein the adaptation means that the high-strength spring can provide enough elastic potential energy on one hand, and on the other hand, the iron chuck can be separated from the iron chuck and pressed when the high-strength springs are compressed and relaxed), and the adjustment is very convenient. In addition, during pressurization, because the shaft pressing device has oil pressure originally, only a small amount of hydraulic oil needs to be supplied to the shaft pressing device on the basis, the pressure in the shaft pressing device can be greatly increased, and the pressurization is very quick.
The vertical position of steel slider has been injectd to the structure of roll cooperation on the one hand, and on the other hand has reduced the frictional force between the pore wall of steel slider and slide opening again simultaneously.
The diameter of the micropores is less than or equal to 0.1 mm, so that gas can pass through the micropores, and coal dust generated by a coal sample can be prevented from entering the micropores under most conditions.
The coal sample storage device is simple in structure and can conveniently receive gas, so that the phenomenon that underground coal bodies are affected by rock burst is simulated more truly by adsorbing the gas through the coal sample, the coal sample can be conveniently subjected to confining pressure through the confining pressure cavity and the annular sealing rubber sleeve, and meanwhile, the downward impact pressure of the axial compression device is conveniently borne.
In the coal breaking experiment method of the utility model, the second step to the sixth step form an experiment cycle, and the coal breaking experiment under the axle pressure confining pressure condition is completed in one experiment cycle; the concrete pressure condition in the coal body of different regions is different, and second step to sixth step are carried out repeatedly, thereby change different axle pressure confined pressure and simulate the coal body pressure condition in different regions in the fourth step, can accomplish the broken coal experiment under different axle pressure confined pressures.
Compare with current impact ground crushing contains gas coal simulation experiment system and experimental method, the utility model discloses need not promote the heavy object, the bigger and easy accurate size of adjusting the impact force of pressure that can release, the speed of release impact force is faster (the speed that the speed of spring stretch is far away in the heavy object whereabouts), and these all make the utility model discloses can carry out the coal simulation experiment of impact ground crushing more near actual conditions ground, be convenient for adjust confined pressure axle pressure and impact force moreover, be suitable for and carry out the coal simulation experiment of impact ground moulding-die crushing under the different conditions fast many times, help drawing more accurate experiment conclusion, provide technical support for the exploitation of underground coal.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a schematic diagram of the electromagnetic booster mechanism of FIG. 1;
FIG. 3 is a schematic view of the axle press assembly and coal sample storage assembly of FIG. 1;
FIG. 4 is a schematic top view of the annular steel plate, the first packing cylinder and the steel spacer;
fig. 5 is a schematic top view at the second top plate.
Detailed Description
As shown in fig. 1 to 5, the simulation experiment system for breaking coal containing gas by impact comprises an electromagnetic booster mechanism 11, a hydraulic power unit 30, an axial compression device and a coal sample storage device; the hydraulic pump station 30 provides the coal sample storage device with hydraulic oil for generating confining pressure, the hydraulic pump station 30 provides the axial pressure device with hydraulic oil for generating axial pressure, the hydraulic pump station 30 provides the electromagnetic supercharging mechanism 11 with hydraulic oil for supercharging, the electromagnetic supercharging mechanism 11 provides the axial pressure device with hydraulic oil for simulating rock burst, and the axial pressure device provides the coal sample storage device with pressure for simulating rock burst. The device also comprises a gas adsorption and desorption device; the gas adsorption and desorption device is used for adsorbing and desorbing gas in a coal sample.
The electromagnetic supercharging mechanism 11 comprises a first frame 1, the first frame 1 comprises a first base 2 and a first top plate 3, a first hydraulic cylinder 4 is arranged on the first base 2, the inner cavity wall of the first hydraulic cylinder 4 is connected with a first piston 5 in a sealing sliding mode, the first piston 5 is horizontally arranged, a steel sliding block 12 is borne on the upper surface of the first piston 5, a through sliding hole is formed in the top wall of the first hydraulic cylinder 4, and the steel sliding block 12 extends out of the sliding hole upwards; the first piston 5 and the inner cavity wall of the first hydraulic cylinder 4 below the first piston enclose a pressurized hydraulic cavity 13;
the first top plate 3 is fixedly connected with an electromagnetic chuck 14, and the electromagnetic chuck 14 is connected with an electric control device 15 through a connecting line 18; the electromagnetic chuck 14 is downwards connected with a spring set 6, and the spring set 6 comprises a plurality of high-strength springs; the lower end of each high-strength spring is connected with an iron sucker 7, and the iron sucker 7 is positioned right above the steel sliding block 12; when the high-strength springs are in a relaxation state and the pressurizing hydraulic cavity 13 is filled with oil, the iron sucker 7 is in compression joint with the steel sliding block 12, and when the high-strength springs are in a compression state, the iron sucker 7 is separated from the steel sliding block 12;
the pressurizing hydraulic cavity 13 is connected with a first liquid inlet pipe 8 and a first liquid outlet pipe 9, the first liquid inlet pipe 8 is used for supplying hydraulic oil to the pressurizing hydraulic cavity 13, and the first liquid outlet pipe 9 is used for allowing the hydraulic oil in the pressurizing hydraulic cavity 13 to flow out; a first valve 10 is arranged on the first liquid inlet pipe 8, and a one-way valve 16 is arranged on the first liquid outlet pipe 9; the first liquid inlet pipe 8 and the first liquid outlet pipe 9 are both connected with a first pipeline 17, and the first pipeline 17 is connected with a shaft pressing device; the one-way opening direction of the one-way valve 16 is from the pressurized hydraulic chamber 13 toward the first conduit 17.
The electronic control device 15 may be a computer, a single chip or an integrated circuit. The electromagnetic supercharging mechanism 11 has a simple structure, and each high-strength spring is in a compressed state and accumulates strong elastic potential energy when the electromagnetic suction disc 14 is controlled by the electric control device 15 to adsorb the iron suction disc 7; the magnitude of the elastic potential energy can be adjusted by adjusting the suction force of the electromagnetic chuck 14 (for example, replacing electromagnetic chucks 14 of different models or supplying different voltage and current to the same electromagnetic chuck 14) and adjusting the magnitude of the elastic force of the high-strength spring (for example, replacing the high-strength spring with elastic force adaptation; adaptation here means that the high-strength spring can provide enough elastic potential energy on one hand, and on the other hand, the iron chuck 7 can be separated from and pressed with the iron chuck 7 during compression and relaxation of each high-strength spring), and the adjustment is very convenient. In addition, during pressurization, because the shaft pressing device has oil pressure originally, only a small amount of hydraulic oil needs to be supplied to the shaft pressing device on the basis, the pressure in the shaft pressing device can be greatly increased, and the pressurization is very quick.
A plurality of balls 19 are embedded on the wall of the sliding hole at uniform intervals, and the side wall of the steel sliding block 12 is in rolling fit with the balls 19.
The structure of roll cooperation has limited the vertical position of steel slider 12 on the one hand, and on the other hand has reduced the frictional force between the pore wall of steel slider 12 and slide opening again simultaneously.
The coal sample storage device comprises a second base 20, the second base 20 is upwards connected with a lower hydraulic cylinder 21, the lower hydraulic cylinder 21 is vertically arranged, the bottom of an inner cavity of the lower hydraulic cylinder 21 is provided with a steel pore plate 22, a plurality of micropores for gas to pass through are uniformly distributed on the steel pore plate 22, and the diameter of each micropore is less than or equal to 0.1 mm;
the lower hydraulic cylinder 21 is upwards connected with an annular steel plate 23 through a bolt 24; the hole wall of the central hole of the annular steel plate 23 is connected with a first sealing rubber cylinder 25, a cylindrical steel cushion block 26 is tightly pressed in the first sealing rubber cylinder 25, the upper surface of the steel cushion block 26 is flush with the upper surface of the annular steel plate 23, and the lower surface of the steel cushion block 26 is flush with the lower surface of the annular steel plate 23;
an annular sealing rubber sleeve 27 is arranged in the inner cavity of the lower hydraulic cylinder 21, the bottom of the annular sealing rubber sleeve 27 is connected with the steel pore plate 22, the annular sealing rubber sleeve 27 is provided with an inner cavity and the inner cavity is used as a confining pressure cavity 28, and a central hole surrounded by the annular sealing rubber sleeve is used as a coal sample cavity 51 for containing a coal sample; the upper end of the coal sample cavity 51 is connected with the steel cushion block 26, and the lower end is connected with the steel pore plate 22;
the circumferential outer wall of the annular sealing rubber sleeve 27 is connected with the inner wall of the lower hydraulic cylinder 21; the top of the annular sealing rubber sleeve 27 is connected with the annular steel plate 23 and the first sealing rubber cylinder 25; the confining pressure cavity 28 is connected with a fourth pipeline 29, and the fourth pipeline 29 is connected with a hydraulic pump station 30;
the gas adsorption and analysis device comprises a high-pressure gas bottle 31, the high-pressure gas bottle 31 is connected with a gas supply pipeline 32, and a gas supply valve 33, a pressure gauge 34 and a first flowmeter 35 are arranged on the gas supply pipeline 32; a gas supply hole and a gas analysis hole are formed in the second base 20, and the gas supply hole and the gas analysis hole are communicated with each other; the gas supply hole is connected to the steel orifice plate 22, and the gas supply line 32 extends into the gas supply hole and is connected to the steel orifice plate 22. The first flow meter 35 is connected to the electronic control device 15. The gas supply hole is connected with a gas analysis pipeline, the gas analysis pipeline extends into the gas supply hole and is communicated with the gas supply pipeline 32, the gas analysis pipeline extends out of the second base 20 and is provided with a second flowmeter 49 and a valve 50 for gas analysis; the second flow meter 49 is connected to the electronic control device.
The diameter of the micropores is less than or equal to 0.1 mm, so that gas can pass through the micropores, and coal dust generated by a coal sample can be prevented from entering the micropores under most conditions.
The coal sample storage device is simple in structure and can conveniently receive gas, so that the phenomenon that underground coal bodies are affected by rock burst is simulated more truly by the fact that the coal samples absorb the gas, the coal samples can be conveniently subjected to confining pressure through the confining pressure cavity 28 and the annular sealing rubber sleeve 27, and meanwhile the downward impact pressure of the axial compression device can be conveniently borne.
The outer wall of the lower hydraulic cylinder 21 is fixedly connected with a mounting frame 36; the mounting bracket 36 extends upward and is connected with a second top plate 37;
the second top plate 37 is connected with an upper hydraulic cylinder 38 downwards through a bolt 24, the inner cavity wall of the upper hydraulic cylinder 38 is connected with a third sealing rubber cylinder 39, and the top of the third sealing rubber cylinder 39 extends out of the upper hydraulic cylinder 38 and is tightly pressed between the second top plate 37 and the upper hydraulic cylinder 38; the inner wall of the third sealing rubber cylinder 39 is connected with a second piston 40 in a sliding manner, and the second piston 40 is fixedly connected with a piston rod 41 downwards; the upper hydraulic cylinder 38 is provided with a bottom wall, a through hole is arranged at the center of the bottom wall of the upper hydraulic cylinder 38, and the bottom of the third sealing rubber cylinder 39 extends into the through hole and is fixedly connected (for example, bonded) with the wall of the through hole; the piston rod 41 extends out of a through hole in the bottom wall of the upper hydraulic cylinder 38 through the third sealing rubber cylinder 39, and the piston rod 41 is in sliding sealing fit with the third sealing rubber cylinder 39 in the through hole; a shaft pressure cavity 42 is enclosed by the second piston 40, the third sealing rubber cylinder 39 above the second piston and the second top plate 37, and an oil return cavity 43 is enclosed by the second piston 40 and the third sealing rubber cylinder 39 below the second piston; the bottom of the oil return oil cavity 43 is connected with a third pipeline 44, and the third pipeline 44 extends out of the third sealing rubber cylinder 39 and the upper hydraulic cylinder 38 to be connected with the hydraulic pump station 30; the axial pressure cavity 42 is connected with a first pipeline 17 and a second pipeline 45, the first pipeline 17 extends out of the second top plate 37 and is connected with the first liquid inlet pipe 8 and the first liquid outlet pipe 9; a second conduit 45 extends from the second head plate 37 and is connected to the hydraulic pumping station 30.
The bottom surface of the piston rod 41 is provided with a film pressure sensor which is connected with the electric control device 15; a second valve 46 is arranged at the joint of the hydraulic pump station 30 and the second pipeline 45, a third valve 47 is arranged at the joint of the hydraulic pump station 30 and the third pipeline 44, and a fourth valve 48 is arranged at the joint of the hydraulic pump station 30 and the fourth pipeline 29. The membrane pressure sensor is conventional and not shown.
The utility model also discloses a broken coal experimental method that uses above-mentioned rock burst to contain broken coal of gas simulation experiment system to go on, is gone on according to following step by the experimenter:
the first step is a checking step, the states of the electromagnetic pressurization mechanism 11, the hydraulic pump station 30, the axial compression device, the coal sample storage device and the gas adsorption and analysis device are checked, and the normal operation of the simulation experiment system for crushing the coal containing gas by impact is ensured; in the step, the electromagnetic supercharging mechanism 11 and the hydraulic pump station 30 are started, whether the electromagnetic supercharging mechanism 11 and the hydraulic pump station 30 can normally operate is observed, and the electromagnetic supercharging mechanism 11 and the hydraulic pump station 30 are closed after the normal operation is confirmed; the air pressure of the high-pressure gas cylinder 31 is checked, and whether the air passage and the hydraulic oil passage are normal or not is checked.
The second step is a coal sample placing step, wherein the coal sample is placed in a coal sample storage device;
the third step is a gas adsorption step, so that the coal sample adsorbs gas;
the fourth step is an axial pressure applying and confining pressure step, which applies preset axial pressure and confining pressure to the coal sample;
the fifth step is a step of simulating rock burst and analyzing gas of the coal sample, and the gas in the coal sample is analyzed while a preset impact force is applied to the coal body;
the sixth step is an end step of taking out the coal sample from the coal sample storage device to end the experiment.
In the coal breaking experiment method of the utility model, the second step to the sixth step form an experiment cycle, and the coal breaking experiment under the axle pressure confining pressure condition is completed in one experiment cycle; the concrete pressure condition in the coal body of different regions is different, and second step to sixth step are carried out repeatedly, thereby change different axle pressure confined pressure and simulate the coal body pressure condition in different regions in the fourth step, can accomplish the broken coal experiment under different axle pressure confined pressures.
The second step is specifically:
an experimenter takes down the bolt 24 at the position of the annular steel plate 23, takes down the annular steel plate 23, the first sealing rubber cylinder 25 and the steel cushion block 26 from the top of the lower hydraulic cylinder 21, puts a coal sample into the coal sample cavity 51, and then covers the annular steel plate 23, the first sealing rubber cylinder 25 and the steel cushion block 26 on the top of the lower hydraulic cylinder 21;
because the first packing rubber tube 25 and the steel cushion block 26 have large friction force when being pressed tightly, the annular steel plate 23, the first packing rubber tube 25 and the steel cushion block 26 can be taken down from the top of the lower hydraulic cylinder 21 together.
The annular steel plate 23 is fixedly connected with the lower hydraulic cylinder 21 through the bolt 24, and the steel cushion block 26 is in contact with the top of the coal sample, so that the coal sample is placed in the coal sample storage device;
the third step is specifically: the experimenter opens the gas supply valve 33 to ensure that the gas analysis valve 50 is in a closed state; controlling the gas supply pressure indicated by the pressure gauge 34 to a predetermined value by controlling the opening degree of the gas supply valve 33; after the gas supply valve 33 is opened, gas enters a coal sample through the gas supply pipeline 32 and the steel orifice plate 22, the coal sample starts to adsorb the gas, when the reading of the first flowmeter 35 is reduced to zero, the coal sample adsorbs the gas to reach an equilibrium state (adsorption and analysis), and at the moment, the gas supply valve 33 is closed, so that the operation of adsorbing the gas by the coal sample is completed;
the fourth step specifically comprises confining pressure pressing operation and axial pressure pressing operation;
the confining pressure applying operation comprises the following steps: the experimenter starts the hydraulic pump station 30, sets the output oil pressure to be a preset pressure value, opens the fourth valve 48, injects hydraulic oil with preset pressure into the confining pressure cavity 28 through the fourth pipeline 29, and the hydraulic oil generates preset confining pressure (namely confining pressure) on the coal sample through the annular sealing rubber sleeve 27; finally, the fourth valve 48 is closed for pressure maintaining;
the shaft pressure applying operation comprises oil injection operation of the pressurizing hydraulic cavity 13 and pressurizing operation of the shaft pressure cavity 42;
the oil injection operation of the pressurizing hydraulic cavity 13 is as follows: setting the output oil pressure of the hydraulic pump station 30 to be less than 0.1KPa, opening the second valve 46 and the first valve 10, allowing hydraulic oil to enter the pressurizing hydraulic cavity 13 through the second pipeline 45, the shaft pressure cavity 42, the first pipeline 17 and the first liquid inlet pipe 8 until the iron sucker 7 is pressed with the iron sucker 7 upwards, and closing the first valve 10;
the pressurization operation of the axial pressure chamber 42 is: setting the output oil pressure of the hydraulic pump station 30 to a preset pressure, driving the piston rod 41 to move downwards by the second piston 40 under the action of the oil pressure, closing the second valve 46 and the hydraulic pump station 30 until the lower end of the piston rod 41 presses the steel cushion block 26, and generating a preset axial pressure (namely, axial pressure) on the coal sample by the steel cushion block 26;
the fifth step is specifically: the method comprises energy storage operation, impact operation and analysis operation;
the energy storage operation is as follows: an experimenter starts the electromagnetic chuck 14 through the electric control device 15, the electromagnetic chuck 14 attracts the iron chuck 7, the iron chuck 7 upwards compresses the spring group 6, and the spring group 6 (each high-strength spring in the spring group) accumulates elastic potential energy;
the impact operation is as follows: an experimenter closes the electromagnetic chuck 14 through the electric control device 15, elastic potential energy accumulated by the spring group 6 is released instantly, the spring group 6 pushes the iron chuck 7 downwards, the iron chuck 7 impacts the steel slide block 12 downwards, the steel slide block 12 transmits impact energy of the iron chuck 7 to hydraulic oil in the pressurizing hydraulic cavity 13 through the first piston 5, oil pressure in the first liquid outlet pipe 9 is increased instantly to open the one-way valve 16, high oil pressure acts on the second piston 40 along the first liquid outlet pipe 9, the first pipeline 17 and the axial pressure cavity 42, a piston rod 41 of the second piston 40 impacts the steel cushion block 26 downwards, the steel cushion block 26 impacts a coal sample downwards, preset impact force is applied to the coal body, and meanwhile gas in the coal sample is analyzed.
The analysis operation is: before the experimenter performs the impact operation, the experimenter opens the valve 50 for gas analysis; after the impact operation is carried out, the gas in the coal sample is analyzed out and flows out through a gas analysis pipeline; the gas analysis amount of the coal sample is observed and recorded by the second flow meter 49. Of course, the gas analysis rate can be calculated from the analysis time and the analysis amount.
The sixth step is specifically: opening the second valve 46 and the first valve 10, returning the hydraulic oil into the hydraulic pumping station 30 through the first liquid inlet pipe 8, the first pipeline 17, the shaft pressure cavity 42 and the second pipeline 45, and closing the first valve 10;
opening the third valve 47 and the hydraulic pump station 30, setting the output oil pressure of the hydraulic pump station 30 to a predetermined pressure, and allowing the hydraulic oil to enter the oil return oil chamber 43 through the third pipeline 44 to move the second piston 40 upward for resetting; after the second piston 40 is reset, the third valve 47 and the hydraulic pump station 30 are closed;
the bolts 24 at the annular steel plate 23 are removed, the annular steel plate 23, the first rubber seal sleeve 25 and the steel cushion block 26 are removed together from the top of the lower hydraulic cylinder 21, the coal sample is taken out through the annular rubber seal sleeve 27, and the experiment is ended.
The utility model discloses can effectively simulate under the rock burst condition the coal body break, the analytic characteristic of gas, for different ground pressure takes place the rock burst in the stress coal seam coal body gas analytic characteristic provides data parameter, the analytic research system of coal body gas when further perfecting the coal seam and taking place the rock burst.
The above embodiments are only used for illustrating but not limiting the technical solutions of the present invention, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the present invention may be modified or substituted with equivalents without departing from the spirit and scope of the invention, which should be construed as being limited only by the claims.
Claims (7)
1. The impact ground crushing gas-containing coal simulation experiment system is characterized in that: the device comprises an electromagnetic supercharging mechanism, a hydraulic pump station, an axial compression device and a coal sample storage device; the hydraulic pump station provides the hydraulic oil that is used for producing the confined pressure for coal sample strorage device, and hydraulic pump station provides the hydraulic oil that is used for producing the axle load for the axle load device, and hydraulic pump station provides the hydraulic oil that is used for the pressure boost for electromagnetism booster mechanism, and electromagnetism booster mechanism provides the hydraulic oil that is used for simulating the rock burst for the axle load device, and the axle load device provides the pressure that is used for simulating the rock burst for coal sample strorage device.
2. The system for simulating and testing coal containing gas by impact crushing as claimed in claim 1, wherein: the device also comprises a gas adsorption and desorption device; the gas adsorption and desorption device is used for adsorbing and desorbing gas in a coal sample.
3. The system for simulating and testing coal containing gas by impact crushing as claimed in claim 2, wherein:
the electromagnetic supercharging mechanism comprises a first rack, the first rack comprises a first base and a first top plate, a first hydraulic cylinder is arranged on the first base, the inner cavity wall of the first hydraulic cylinder is connected with a first piston in a sealing and sliding mode, the first piston is horizontally arranged, a steel sliding block is loaded on the upper surface of the first piston, a through sliding hole is formed in the top wall of the first hydraulic cylinder, and the steel sliding block extends out of the sliding hole upwards; a pressurizing hydraulic cavity is formed by the first piston and the inner cavity wall of the first hydraulic cylinder below the first piston;
the first top plate is fixedly connected with an electromagnetic chuck, and the electromagnetic chuck is connected with an electric control device through a connecting circuit; the electromagnetic chuck is downwards connected with a spring set, and the spring set comprises a plurality of high-strength springs; the lower end of each high-strength spring is connected with an iron sucker which is positioned right above the steel slide block; when the high-strength springs are in a relaxation state and the pressurizing hydraulic cavity is filled with oil, the iron sucker is in compression joint with the steel sliding block, and when the high-strength springs are in a compression state, the iron sucker is separated from the steel sliding block;
the pressurizing hydraulic cavity is connected with a first liquid inlet pipe and a first liquid outlet pipe, the first liquid inlet pipe is used for supplying hydraulic oil to the pressurizing hydraulic cavity, and the first liquid outlet pipe is used for allowing the hydraulic oil in the pressurizing hydraulic cavity to flow out; a first valve is arranged on the first liquid inlet pipe, and a one-way valve is arranged on the first liquid outlet pipe; the first liquid inlet pipe and the first liquid outlet pipe are both connected with a first pipeline, and the first pipeline is connected with a shaft pressing device; the one-way opening direction of the one-way valve is from the pressurizing hydraulic cavity to the first pipeline.
4. The system for simulating and testing coal containing gas by impact crushing as claimed in claim 3, wherein: the wall of the sliding hole is evenly embedded with a plurality of balls at intervals, and the side wall of the steel sliding block is matched with the balls in a rolling manner.
5. The system for simulating and testing coal containing gas by impact crushing according to claim 3 or 4, wherein: the coal sample storage device comprises a second base, the second base is upwards connected with a lower hydraulic cylinder, the lower hydraulic cylinder is vertically arranged, the bottom of an inner cavity of the lower hydraulic cylinder is provided with a steel pore plate, a plurality of micropores for gas to pass through are uniformly distributed on the steel pore plate, and the diameter of each micropore is less than or equal to 0.1 mm;
the lower hydraulic cylinder is upwards connected with an annular steel plate through a bolt; the hole wall of the central hole of the annular steel plate is connected with a first sealing rubber cylinder, a cylindrical steel cushion block is tightly pressed in the first sealing rubber cylinder, the upper surface of the steel cushion block is flush with the upper surface of the annular steel plate, and the lower surface of the steel cushion block is flush with the lower surface of the annular steel plate;
an annular sealing rubber sleeve is arranged in the inner cavity of the lower hydraulic cylinder, the cylinder bottom of the annular sealing rubber sleeve is connected with a steel pore plate, the annular sealing rubber sleeve is provided with an inner cavity and the inner cavity of the annular sealing rubber sleeve is used as a confining pressure cavity, and a central hole surrounded by the annular sealing rubber sleeve is used as a coal sample cavity for containing a coal sample; the upper end of the coal sample cavity is connected with a steel cushion block, and the lower end of the coal sample cavity is connected with a steel pore plate;
the circumferential outer wall of the annular sealing rubber sleeve is connected with the inner wall of the lower hydraulic cylinder; the top of the annular sealing rubber sleeve is connected with the annular steel plate and the first sealing rubber cylinder; the inner cavity of the annular sealing rubber sleeve is used as a confining pressure cavity which is connected with a fourth pipeline, and the fourth pipeline is connected with a hydraulic pump station;
the gas adsorption and analysis device comprises a high-pressure gas bottle, the high-pressure gas bottle is connected with a gas supply pipeline, and a gas supply valve, a pressure gauge and a first flowmeter are arranged on the gas supply pipeline; a gas supply hole and a gas analysis hole are formed in the second base and are communicated with each other; the gas supply hole is connected with the steel orifice plate, and the gas supply pipeline extends into the gas supply hole and is connected with the steel orifice plate; the gas supply hole is connected with a gas analysis pipeline, the gas analysis pipeline extends into the gas supply hole and is communicated with the gas supply pipeline, the gas analysis pipeline extends out of the second base, and a second flowmeter and a gas analysis valve are arranged on the gas analysis pipeline.
6. The system for simulating and testing coal containing gas by impact crushing as claimed in claim 5, wherein: the outer wall of the lower hydraulic cylinder is fixedly connected with an installation frame; the mounting frame extends upwards and is connected with a second top plate;
the second top plate is downwards connected with an upper hydraulic cylinder through a bolt, the inner cavity wall of the upper hydraulic cylinder is connected with a third sealing rubber cylinder, and the top of the third sealing rubber cylinder extends out of the upper hydraulic cylinder and is tightly pressed between the second top plate and the upper hydraulic cylinder; the inner wall of the third sealing rubber cylinder is connected with a second piston in a sliding manner, and the second piston is fixedly connected with a piston rod downwards; the upper hydraulic cylinder is provided with a bottom wall, a through hole is formed in the center of the bottom wall of the upper hydraulic cylinder, and the bottom of the third sealing rubber cylinder extends into the through hole and is fixedly connected with the wall of the through hole; the piston rod extends out of a through hole in the bottom wall of the upper hydraulic cylinder through the third sealing rubber cylinder, and the piston rod is in sliding sealing fit with the third sealing rubber cylinder in the through hole; the second piston, a third sealing rubber cylinder above the second piston and the second top plate enclose an axial pressure cavity, and the second piston and a third sealing rubber cylinder below the second piston enclose an oil return cavity; the bottom of the oil return oil cavity is connected with a third pipeline, and the third pipeline extends out of a third sealing rubber cylinder and an upper hydraulic cylinder to be connected with a hydraulic pump station; the axial pressure cavity is connected with a first pipeline and a second pipeline, and the first pipeline extends out of the second top plate and is connected with the first liquid inlet pipe and the first liquid outlet pipe; the second pipeline extends out of the second top plate and is connected with the hydraulic pump station.
7. The system for simulating and testing coal containing gas by impact crushing as claimed in claim 6, wherein: the bottom surface of the piston rod is provided with a film pressure sensor which is connected with the electric control device; and a second valve is arranged at the joint of the hydraulic pump station and the second pipeline, a third valve is arranged at the joint of the hydraulic pump station and the third pipeline, and a fourth valve is arranged at the joint of the hydraulic pump station and the fourth pipeline.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110007059A (en) * | 2019-05-29 | 2019-07-12 | 河南理工大学 | Bump breaks coal containing methane gas experimental system for simulating and broken coal experimental method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110007059A (en) * | 2019-05-29 | 2019-07-12 | 河南理工大学 | Bump breaks coal containing methane gas experimental system for simulating and broken coal experimental method |
| CN110007059B (en) * | 2019-05-29 | 2023-06-23 | 河南理工大学 | Impact ground pressure breaking gas-containing coal simulation experiment system and coal breaking experiment method |
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