Testing device and method for measuring the strength of gas-solid-bound coal rock

Abstract

The present invention discloses a test device and method for measuring the strength of coal rock in gas-solid state, which comprises a high-pressure gas cylinder, a booster pump, a voltage regulator, a voltage-holding drop weight device, a vacuum pump and a high-pressure rubber tube, the output terminal of the high-pressure gas cylinder is connected to the booster pump through a high-pressure rubber tube, the output terminal of the booster pump is connected to the voltage regulator through a high-pressure rubber tube, the output terminal of the voltage regulator is connected to the input terminal of the voltage-holding drop weight device through a high-pressure rubber tube, the output terminal of the voltage-holding drop weight device is connected to the vacuum pump through a high-pressure rubber tube, the voltage-holding drop weight device comprises an electric control box and a weight crushing cylinder, the weight crushing cylinder is fixed to the bottom of the electric control box, the electric control box and the weight crushing cylinder are electrically connected, the weight crushing cylinder comprises an upper cylinder, an intermediate cylinder, a lower cylinder, a magnetic induction cylinder, an electromagnetic chuck device and a weight. The present invention solves the problem of low accuracy and efficiency of the traditional manual coal rock strength measurement method, and is mainly used for testing the solidity coefficient of coal rock body, and at the same time has the advantages of automated testing and voltage-holding testing.

Description

[Technical field]

[0001] The present invention relates to the technical field of measuring coal rock strength, which is an indicator for predicting coal and gas outburst, and specifically to a testing device and method for measuring the strength of coal rock in a gas-solid state. [Background technology]

[0002] The problem of coal and gas outburst is one of the major disasters in safe production of coal mines. Although the prevention level of coal mine outburst in China has made great progress in recent years, major and extra-large gas accidents still occur from time to time, among which coal and gas outburst accidents are common, and the proportion of gas accidents is increasing year by year. The strength of coal rock is an important indicator for predicting the risk of coal and gas outburst, and accurately measuring the size of the indicator is of great significance in predicting and preventing coal and gas outburst accidents.

[0003] At present, the main method for measuring the strength of coal rock is the drop weight method, and the main principle is to measure the weight or volume of coal powder of a certain grain size formed by the impact of a free-falling weight on the coal rock, thereby reflecting the strength of the coal rock body. Conventional test methods and devices are operated manually, have low accuracy and efficiency, and measure the strength of the coal rock body in a naturally exposed state, which cannot reflect the actual strength of the deep-stratum coal rock body in a gas-solid bonded state. In order to measure the strength of the coal rock body in a gas-solid bonded state, it is urgently necessary to find a new test device and method that can realize the free drop weight test under a voltage holding state. Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention provides a test device and method for measuring the strength of coal rock in a gas-solid bonded state under a voltage holding state, in order to make up for the defects of the prior art, which are that the traditional manually operated method for measuring the strength of coal rock has low accuracy and efficiency, and the measurement result under exposed conditions cannot reflect the actual strength of deep coal rock in a gas-solid bonded state, and is mainly used for testing the strength coefficient of coal rock, and at the same time has the advantages of automated testing and voltage holding testing. [Means for solving the problem]

[0005] In order to achieve the above object, the present invention uses the following technical solutions.

[0006] The present invention relates to a test device for measuring the strength of coal rock in a gas-solid state, the test device comprising a high-pressure gas cylinder, a booster pump, a pressure stabilizing device, a pressure-maintaining drop weight device, a vacuum pump and a high-pressure rubber tube, the output end of the high-pressure gas cylinder is connected to the booster pump by the high-pressure rubber tube, the output end of the booster pump is connected to the pressure stabilizing device by the high-pressure rubber tube, the output end of the pressure stabilizing device is connected to the input end of the pressure-maintaining drop weight device by the high-pressure rubber tube, the output end of the pressure-maintaining drop weight device is connected to the vacuum pump by the high-pressure rubber tube, the pressure-maintaining drop weight device comprises an electric control box and a weight crushing tube, the weight crushing tube is fixed to the bottom of the electric control box, the electric control box and the weight crushing tube are electrically connected, the weight crushing tube is an upper cylinder The magnetic induction cylinder has a body, an intermediate cylinder, a lower cylinder, a magnetic induction cylinder, an electromagnetic chuck device and a weight, the upper cylinder is connected to the intermediate cylinder, the intermediate cylinder is connected to the lower cylinder, one end of the magnetic induction cylinder is installed at the top of the upper cylinder, a cylinder telescopic rod is installed on the magnetic induction cylinder, the cylinder telescopic rod passes through the upper cylinder and enters the intermediate cylinder, the electromagnetic chuck device is installed on the intermediate cylinder, the lower end of the cylinder telescopic rod is fixedly connected to the electromagnetic chuck device, the weight is adsorbed and connected to the bottom of the electromagnetic chuck device, the electric control box and the magnetic induction cylinder are electrically connected, the pressure stabilizing device is connected to the lower cylinder of the weight crushing cylinder by a high-pressure rubber tube, and the lower cylinder of the weight crushing cylinder is connected to the vacuum pump by a high-pressure rubber tube.

[0007] As a preferred solution of the present invention, a first gate valve is connected to the high-pressure rubber tube between the high-pressure gas cylinder and the booster pump, a first pressure sensor is connected to the high-pressure rubber tube between the booster pump and the pressure stabilizing device, and a second gate valve, a second pressure sensor and a flow rate sensor are sequentially connected to the high-pressure rubber tube between the pressure stabilizing device and the pressure maintaining drop weight device.

[0008] As another preferred solution of the present invention, a third gate valve is connected to the high-pressure rubber tube between the pressure-maintaining drop weight device and the vacuum pump, a data collection device is connected to the first pressure sensor, the second pressure sensor and the flow rate sensor, and a computer is connected to the data collection device.

[0009] As another preferred solution of the present invention, an operation panel is installed on the electric control box, the operation panel is attached to the upper part of the front wall of the electric control box, a control circuit is installed inside the electric control box, a number adjustment key, a control switch and an indicator lamp are installed on the operation panel, the number adjustment key, the control switch and the indicator lamp are all connected to the control circuit, the number adjustment key is electrically connected to the magnetic induction type cylinder inside the weight crushing tube by the control circuit, and the electric control box is further electrically connected to the booster pump and the vacuum pump respectively by the control circuit.

[0010] As another preferred solution of the present invention, a first flange is installed on the top of the upper cylinder, which is fixedly connected to the magnetic induction cylinder, the first flange is connected to the mouth of the upper cylinder, the magnetic induction cylinder is fixed to the central hole of the first flange, a cylinder tip is further installed on the magnetic induction cylinder, the cylinder tip is fixedly connected to the center of the first flange, the cylinder tip and the cylinder telescopic rod are sealed and connected by a combination spacer, a second flange is installed between the upper cylinder and the intermediate cylinder, the upper cylinder and the intermediate cylinder are connected by the second flange, and the cylinder telescopic rod of the magnetic induction cylinder passes through the through hole at the center of the second flange and enters the intermediate cylinder.

[0011] As another preferred solution of the present invention, a magnetic or non-magnetic magnetic conversion control member for controlling the electromagnetic chuck device is installed inside the upper cylinder, the magnetic conversion control member includes a conductive rod, a conductive roller and a conductive slide rail, the conductive rods are connected to both sides of the cylinder telescopic rod symmetrically with respect to the center of the cylinder telescopic rod, conductive rollers are connected to the ends of the conductive rods on both sides of the cylinder telescopic rod, conductive slide rails are vertically installed on the inner wall of the upper cylinder, and the conductive rollers are respectively connected to the two conductive rollers in an engaging manner, and the conductive rollers are connected to the conductive slide rails so as to be slidable up and down by the driving of the cylinder telescopic rod, and the conductive slide rails are electrically connected to an electric control box.

[0012] Furthermore, the conductive slide rail includes a conductive copper sheet and an organic glass plate groove, the organic glass plate groove is fixed to the inner wall of the upper cylinder, and the conductive copper sheet is fixedly engaged with the organic glass plate groove.

[0013] Furthermore, a universal joint structure is provided in the electromagnetic chuck device, which ensures that the bottom suction surface of the electromagnetic chuck device and the top surface of the weight are always kept parallel to each other when the bottom suction surface of the electromagnetic chuck device contacts the weight.

[0014] As another preferred solution of the present invention, the lower cylinder is a coal sample storage cylinder, the lower cylinder is equipped with a coal sample tank and a coal sample mortar, the coal sample mortar is engaged and fitted to the outside of the coal sample tank, the coal sample mortar is higher than the coal sample tank, a press ring is installed at the connection point between the lower cylinder and the intermediate cylinder, and the press ring is engaged between the upper end mouth of the coal sample mortar and the intermediate cylinder to realize a seal between the intermediate cylinder and the lower cylinder, and the inner diameter of the coal sample mortar corresponds to the outer diameter of the coal sample tank.

[0015] The present invention further provides a test method for measuring the strength of gas-solid coal rock, which is realized by the test device for measuring the strength of gas-solid coal rock, Step 1 includes the steps of inspecting the airtightness of the test device for measuring the strength of the gas-solid-bonded coal rock, specifically, the steps of first placing the produced coal sample in the lower cylinder and then realizing sealing with a press ring, opening the first gate valve and filling the high-pressure gas in the high-pressure gas cylinder with the lower cylinder containing the coal sample of the pressure-maintaining drop weight device, and using the booster pump and the pressure stabilizing device to reach the maximum pressure required for the experiment, and closing the first gate valve, holding for more than 6 hours and observing whether the pressure changes, if there is a change, the test device needs to be detected, and if there is no change, degassing and evacuating the lower cylinder with a vacuum pump, and carrying out the next step of the experiment. Step 2 includes filling the lower cylinder containing the coal sample of the pressure-maintaining drop weight device with methane gas CH4 at a predetermined pressure, specifically, degassing and evacuating the lower cylinder with a vacuum pump, opening the first gate valve to fill the gas, transmitting data from the first pressure sensor, the second pressure sensor, and the flow rate sensor to a computer by a data collection device, and holding the data for 24 hours or more to allow the gas to be sufficiently adsorbed by the coal sample, recording the final balance pressure, and closing the first gate valve. and step 3, which includes a step of testing the strength of the coal rock, specifically, operating the operation panel of the electric control box to perform a drop weight test after balancing the adsorption of the coal sample, to test the strength of the coal rock under the condition of the planned pressure, and repeating the above steps 1 and 2 to test the strength of the coal rock under different gas pressure conditions. Effect of the Invention

[0016] The beneficial effects of the present invention are as follows:

[0017] Compared with the prior art, the present invention solves the problem of low accuracy and efficiency of the traditional manually operated coal rock strength measurement method, and further solves the problem that the measurement result cannot reflect the actual strength of deep-layer coal rock under gas-solid bonding state under exposed conditions. It is mainly used for testing the strength coefficient of coal rock, and at the same time has the advantages of automated testing and voltage holding testing. When filled with methane gas CH4, the present invention realizes the lifting-free fall-lifting reciprocating motion of the weight in the sealed environment of the coal sample, and realizes the automatic crushing of the coal sample at a certain height, thereby realizing the automated testing of the strength coefficient of the coal rock in a sealed gas-filled environment. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 is a schematic diagram of the overall structure of a testing device for measuring the strength of gas-solid bonded coal rock according to the present invention. [Diagram 2] FIG. 2 is a structural schematic diagram of an operation panel according to the present invention. [Diagram 3] FIG. 2 is a structural schematic diagram of a weight crushing cylinder according to the present invention. [Figure 4] 1 is a schematic diagram showing the structure of a conductive roller according to the present invention; [Diagram 5] 1 is a structural schematic diagram of a conductive slide rail according to the present invention; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] In order to make the technical problem, technical solution and beneficial effects solved by the present invention clearer, the present invention will be described in more detail below by specific embodiments with reference to the drawings. It is understood that the specific embodiments described herein are merely for interpreting the present invention, and are not intended to limit the present invention.

[0020] 1 and 3, an embodiment of the present invention provides a testing device for measuring the strength of coal rock in a gas-solid state, comprising a high-pressure gas cylinder 1, a booster pump 3, a pressure stabilizing device 5, a pressure-maintaining drop weight device 9, a vacuum pump 13 and a high-pressure rubber tube, the output end of the high-pressure gas cylinder 1 is connected to the booster pump 3 through a high-pressure rubber tube, the output end of the booster pump 3 is connected to the pressure stabilizing device 5 through a high-pressure rubber tube, the output end of the pressure stabilizing device 5 is connected to the input end of the pressure-maintaining drop weight device 9 through a high-pressure rubber tube, the output end of the pressure-maintaining drop weight device 9 is connected to the vacuum pump 13 through a high-pressure rubber tube, the pressure-maintaining drop weight device 9 comprises an electric control box 10 and a weight crushing tube 11, the weight crushing tube 11 is fixed to the inner bottom of the electric control box 10 through the top of the electric control box 10, the electric control box 10 and the weight crushing tube 11 are electrically connected, the weight The crushing cylinder 11 comprises an upper cylinder 21, an intermediate cylinder 26, a lower cylinder, a magnetic induction type cylinder 17, an electromagnetic chuck device 25 and a weight 27. The upper cylinder 21 is connected to the intermediate cylinder 26, and the intermediate cylinder 26 is connected to the lower cylinder. One end of the magnetic induction type cylinder 17 is installed at the top of the upper cylinder 21. The magnetic induction type cylinder 17 is provided with a cylinder telescopic rod 22, which passes through the upper cylinder 21 and enters the intermediate cylinder 26. The intermediate cylinder 26 is provided with an electromagnetic chuck device 25. The lower end of the cylinder telescopic rod 22 is fixedly connected to the electromagnetic chuck device 25. The weight 27 is attached to the bottom of the electromagnetic chuck device 25. The electric control box 10 and the magnetic induction type cylinder 17 are electrically connected. The pressure stabilizing device 5 is connected to the lower cylinder of the weight crushing cylinder 11 by a high-pressure rubber tube, and the lower cylinder of the weight crushing cylinder 11 is connected to the vacuum pump 13 by a high-pressure rubber tube.

[0021] A first gate valve 2 is connected to a high-pressure rubber tube between the high-pressure gas cylinder 1 and a booster pump 3, a first pressure sensor 4 is connected to a high-pressure rubber tube between the booster pump 3 and a pressure stabilizer 5, and a second gate valve 6, a second pressure sensor 7, and a flow rate sensor 8 are sequentially connected to a high-pressure rubber tube between the pressure stabilizer 5 and a pressure maintaining drop weight device 9. Specifically, the first gate valve 2 is for controlling the gas flow condition in the high-pressure gas cylinder 1, the booster pump 3 can increase the gas pressure from the high-pressure gas cylinder 1, and the pressure stabilizer 5 can reduce the pressure. The gas can be stabilized after being raised, and a constant pressure gas is obtained. The second gate valve 6 is for controlling whether the gas in the high-pressure rubber tube flows into the lower cylindrical body of the weight crushing tube 11 of the pressure-maintained drop weight device 9, the first pressure sensor 4 is for detecting the pressure condition of the gas flowing through the high-pressure rubber tube, the second pressure sensor 7 is for detecting the pressure condition of the gas flowing into the lower cylindrical body of the weight crushing tube 11 of the pressure-maintained drop weight device 9, and the flow rate sensor 8 is for detecting the flow rate condition of the gas flowing into the lower cylindrical body of the weight crushing tube 11 of the pressure-maintained drop weight device 9.

[0022] A third gate valve 12 is connected to the high-pressure rubber tube between the pressure-maintaining drop weight device 9 and the vacuum pump 13. By opening the third gate valve 12, the vacuum pump 13 can extract the gas in the lower cylinder of the weight crushing tube 11 of the pressure-maintaining drop weight device 9. The signal input terminal of the data collection device 14 is connected to the first pressure sensor 4, the second pressure sensor 7, and the flow rate sensor 8 by a circuit, and the signal output terminal of the data collection device 14 is connected to the computer 15 by a circuit.

[0023] 1 to 3, an operation panel 16 is installed on the electric control box 10, the operation panel 16 is attached to the upper part of the front wall of the electric control box 10, a control circuit is installed inside the electric control box 10, the control circuit is a normal circuit, and detailed explanations of the circuit connection structure and principle are omitted in the embodiments of the present invention, the operation panel 16 is installed with a number adjustment key 162, a control switch 163 and an indicator lamp 161, the control switch 163 includes an air pump switch, a test switch and a power switch, the indicator lamp 161 includes an air pump indicator lamp, an up indicator lamp and a down indicator lamp, the power switch is for controlling the power supply and power off of the entire test apparatus, the test switch is for controlling the operation of the pressure-maintaining drop weight device 9, the number adjustment key 162 is installed on the pressure-maintaining drop weight device When the pressure-maintaining drop weight device 9 is operating, the cylinder telescopic rod 22 of the magnetic induction type cylinder 17 moves up and down, and when it rises, the rise indicator light turns on correspondingly, and when it descends, the descent indicator light turns on correspondingly, thereby realizing the lifting and dropping of the weight 27. The air pump switch is for controlling the operation of the vacuum pump 13, and when the vacuum pump 13 is operating, the air pump indicator light turns on. The number of times adjustment key 162, the control switch 163 and the indicator light 161 are all connected to the control circuit, and the number of times adjustment key 162 and the test switch are all electrically connected to the magnetic induction type cylinder 17 inside the weight crushing tube 11 by the control circuit. The electric control box 10 is further electrically connected to the booster pump 3 and the vacuum pump 13 respectively by the control circuit.

[0024] A first flange 19 is installed on the top of the upper cylinder 21 and is fixedly connected to the magnetic induction type cylinder 17. The first flange 19 is connected to the mouth of the upper cylinder 21. The connection between the first flange 19 and the upper cylinder 21 is sealed with an O-shaped seal ring. The magnetic induction type cylinder 17 is fixed to the center hole of the first flange 19. The magnetic induction type cylinder 17 is further equipped with a cylinder tip 18, which is fixedly connected to the center of the first flange 19. The cylinder tip 18 and the cylinder telescopic rod 22 are sealed and connected by a combination spacer. A second flange 24 is installed between the upper cylinder 21 and the intermediate cylinder 26. The upper cylinder 21 and the intermediate cylinder 26 are connected by the second flange 24. The cylinder telescopic rod 22 of the magnetic induction type cylinder 17 passes through the through hole at the center of the second flange 24 and enters the intermediate cylinder 26.

[0025] 3 to 5, a magnetic or non-magnetic magnetic conversion control member for controlling the electromagnetic chuck device 25 is installed in the upper cylinder 21, and the magnetic conversion control member includes a conductive rod 23, a conductive roller 31, and a conductive slide rail 32. The conductive rods 23 are connected to both sides of the cylinder telescopic rod 22 symmetrically with respect to the center of the cylinder telescopic rod 22, and conductive rollers 31 are connected to the ends of the conductive rods 23 on both sides of the cylinder telescopic rod 22. The conductive slide rails 32 are vertically installed on the inner wall of the upper cylinder 21 and are engaged with the two conductive rollers 31. The conductive rollers 31 are connected to the conductive slide rails 32 by driving the cylinder telescopic rod 22 so as to be vertically slidable, and the conductive slide rails 32 are electrically connected to the electric control box 10.

[0026] The conductive slide rail 32 comprises a conductive copper sheet 321 and an organic glass plate groove 322. The organic glass plate groove 322 is fixed to the inner wall of the upper cylindrical body 21. The conductive copper sheet 321 is fixedly engaged with the organic glass plate groove 322. The length of the conductive copper sheet 321 is smaller than the length of the organic glass plate groove 322. The lower edge of the conductive copper sheet 321 is aligned with the lower edge of the organic glass plate groove 322. The upper edge of the conductive copper sheet 321 is lower than the upper edge of the organic glass plate groove 322. Thus, there is an area at the top of the organic glass plate groove 322 where the conductive copper sheet 321 is not present.

[0027] A universal joint structure is provided in the electromagnetic chuck device 25, and the provision of the universal joint structure ensures that when the bottom suction surface of the electromagnetic chuck device 25 comes into contact with the weight 27, the bottom suction surface of the electromagnetic chuck device 25 and the top surface of the weight 27 are always maintained parallel to each other.

[0028] It should be noted that the electromagnetic chuck device 25 is a conventional technology, and in the embodiments of the present invention, a detailed description of the specific detailed structure of the electromagnetic chuck device 25 is omitted. The separation and approach of the weight 27 by the electromagnetic chuck device 25 is realized by turning off and turning on the electromagnetic induction coil inside the electromagnetic chuck device 25. When the electromagnetic chuck device 25 is turned on, it is magnetic and attracts the weight 27, and when the electromagnetic chuck device 25 is turned off, it is not magnetic and does not act on the weight 27. The magnetic induction cylinder 17 is driven by the cylinder telescopic rod 22 to reciprocate up and down relative to the electromagnetic chuck device 25, and after lifting the weight 27 to a certain height, the conductive roller 31 at the end of the conductive rod 23 connected to the cylinder telescopic rod 22 is located in the area where there is no conductive copper sheet 321 at the top of the conductive slide rail 32. Therefore, the electromagnetic chuck device 25 is turned off, and the weight 27 falls due to its lack of magnetism, and the free fall of the weight 27 crushes the coal samples in the coal sample tank 30. Specifically, the magnetic or non-magnetic properties of the electromagnetic chuck device 25, i.e., the magnetic conversion, is realized by a magnetic conversion control member, which is composed of a conductive rod 23, a conductive roller 31, and a conductive slide rail 32. The electromagnetic chuck device 25, the cylinder telescopic rod 22, the conductive rod 23, and the conductive roller 31 are electrically connected integrally to the conductive slide rail 32. The operation panel 16 of the electric control box 10 controls whether electricity is passed through the conductive slide rail 32, thereby further controlling the electromagnetic magnetic conversion of the electromagnetic chuck device 25.

[0029] The lower cylinder is a coal sample storage cylinder, and the lower cylinder is equipped with a coal sample tank 30 and a coal sample mortar 29. The coal sample mortar 29 is engaged and fitted onto the outside of the coal sample tank 30. The coal sample mortar 29 is higher than the coal sample tank 30. A press ring 28 is installed at the connection point between the lower cylinder and the intermediate cylinder 26. The press ring 28 is engaged between the upper end mouth of the coal sample mortar 29 and the intermediate cylinder 26 to seal the intermediate cylinder 26 and the lower cylinder. The inner diameter of the coal sample mortar 29 corresponds to the outer diameter of the coal sample tank 30.

[0030] The present invention further provides a test method for measuring the strength of gas-solid coal rock, which is realized by the test device for measuring the strength of gas-solid coal rock, Step 1 includes the steps of inspecting the airtightness of the test equipment for measuring the strength of the gas-solid-bonded coal rock, specifically, the steps of first placing the produced coal sample in the lower cylinder and then sealing with the press ring 28, opening the first gate valve 2, filling the high-pressure gas in the high-pressure gas cylinder 1 into the lower cylinder containing the coal sample in the pressure-maintaining drop weight device 9, and closing the first gate valve 2 when the maximum pressure required for the experiment is reached by the booster pump 3 and the pressure stabilizing device 5, maintaining the pressure for 6 hours or more, observing whether the pressure changes, and if there is a change, the test equipment must be detected, and if there is no change, degassing and evacuating the lower cylinder with the vacuum pump 13, and carrying out the next step of the experiment. Step 2 includes filling the lower cylinder containing the coal sample of the pressure-maintaining drop weight device 9 with methane gas CH4 at a predetermined pressure, specifically, degassing and evacuating the lower cylinder with a vacuum pump 13, opening the first gate valve 2 to fill the gas, transmitting data from the first pressure sensor 4, the second pressure sensor 7, and the flow rate sensor 8 to a computer 15 by a data collection device 14, and holding the data for 24 hours or more to allow the gas to be sufficiently adsorbed by the coal sample, recording the final balance pressure, and closing the first gate valve 2. The method includes a step of testing the strength of the coal rock, specifically, a step of operating the operation panel 16 of the electric control box 10 to perform a drop weight test after balancing the adsorption of the coal sample, to test the strength of the coal rock under the condition of a predetermined pressure, and a step 3 including a step of repeating the above steps 1 and 2 to test the strength of the coal rock under different gas pressure conditions.

[0031] It is understood that the above specific description of the present invention is for illustrating the present invention, and is not limited to the technical solutions described in the embodiments of the present invention. As understood by those skilled in the art, modifications or equivalent substitutions can still be made to the present invention to achieve the same technical effects, and as long as they meet the needs of use, they are all within the protection scope of the present invention. [Explanation of symbols]

[0032] 1. High pressure gas cylinder 2. First gate valve 3. Booster Pump 4. First pressure sensor 5. Pressure Stabilizer 6 Second gate valve 7 Second pressure sensor 8 Flow Sensor 9 Pressure-retaining drop weight device 10 Electrical control box 11. Weight crushing cylinder 12 3rd gate valve 13 Vacuum Pump 14 Data Collection Equipment 15. Computers 16 Operation Panel 161 Indicator lamp 162 Number of times adjustment key 163 Control Switch 17 Magnetic induction cylinder 18 Cylinder tip 19 First flange 21 Upper barrel 22 Cylinder telescopic rod 23 Conductive Rod 24 Second flange 25 Electromagnetic chuck device 26 Intermediate cylinder 27 Weight 28 Press Ring 29 Coal sample mortar 30 Coal sample tank 31 Conductive roller 32 Conductive slide rail 321 Conductive Copper Sheet 322 Organic glass plate groove

Claims

1. A test device for measuring the strength of gas-solid-bound coal rock, comprising: The pressure-maintaining drop weight device is provided with a high-pressure gas cylinder, a booster pump, a pressure stabilizing device, a pressure-maintaining drop weight device, a vacuum pump and a high-pressure rubber tube, the output end of the high-pressure gas cylinder is connected to the booster pump by a high-pressure rubber tube, the output end of the booster pump is connected to the pressure stabilizing device by a high-pressure rubber tube, the output end of the pressure stabilizing device is connected to the input end of the pressure-maintaining drop weight device by a high-pressure rubber tube, the output end of the pressure-maintaining drop weight device is connected to the vacuum pump by a high-pressure rubber tube, the pressure-maintaining drop weight device is provided with an electric control box and a weight crushing tube, the weight crushing tube is fixed to the bottom of the electric control box, the electric control box and the weight crushing tube are electrically connected, the weight crushing tube is provided with an upper cylinder, an intermediate cylinder, a lower cylinder, a magnetic induction type cylinder, an electromagnetic chuck, the upper cylinder is connected to the intermediate cylinder, the intermediate cylinder is connected to the lower cylinder, one end of the magnetic induction cylinder is installed on the top of the upper cylinder, a cylinder telescopic rod is installed on the magnetic induction cylinder, the cylinder telescopic rod passes through the upper cylinder and enters the intermediate cylinder, the electromagnetic chuck device is installed on the intermediate cylinder, a lower portion of the cylinder telescopic rod is fixedly connected to the electromagnetic chuck device, the weight is held by the electromagnetic chuck device, the electric control box and the magnetic induction cylinder are electrically connected, the pressure stabilizing device is connected to the lower cylinder of the weight crushing cylinder by a high-pressure rubber tube, and the lower cylinder of the weight crushing cylinder is connected to the vacuum pump by a high-pressure rubber tube, a conductive roller connected to the end of the conductive rod on both sides of the cylinder telescopic rod; a conductive slide rail vertically installed on the inner wall of the upper cylinder, the conductive roller connected to the conductive slide rail so as to be engaged with the two conductive rollers; the conductive roller is connected to the conductive slide rail by driving the cylinder telescopic rod so as to be vertically slidable; and the conductive slide rail is electrically connected to the electric control box.

2. 2. The testing device for measuring the strength of coal rock in a gas-solid state according to claim 1, wherein a first gate valve is connected to a high-pressure rubber tube between the high-pressure gas cylinder and the booster pump, a first pressure sensor is connected to a high-pressure rubber tube between the booster pump and the pressure stabilizing device, and a second gate valve, a second pressure sensor, and a flow rate sensor are sequentially connected to a high-pressure rubber tube between the pressure stabilizing device and the pressure-maintaining drop weight device.

3. 3. The testing device for measuring the strength of coal rock in a gas-solid state according to claim 2, wherein a third gate valve is connected to a high-pressure rubber tube between the pressure-holding drop weight device and the vacuum pump, a data collection device is connected to each of the first pressure sensor, the second pressure sensor and the flow rate sensor, and a computer is connected to the data collection device.

4. The testing device for measuring the strength of gas-solid coal rock according to claim 1, characterized in that an operation panel is installed on the electric control box, the operation panel is attached to the upper part of the front wall of the electric control box, a control circuit is installed inside the electric control box, a number adjustment key, a control switch and an indication lamp are installed on the operation panel, the number adjustment key, the control switch and the indication lamp are all connected to the control circuit, the number adjustment key is electrically connected to the magnetic induction type cylinder inside the weight crushing tube by the control circuit, and the electric control box is further electrically connected to the booster pump and the vacuum pump respectively by the control circuit.

5. 2. The testing device for measuring the strength of gas-solid coal rock as claimed in claim 1, characterized in that a first flange is installed on the top of the upper cylinder, the first flange is connected to the nozzle of the upper cylinder, the magnetic induction cylinder is fixed to the central hole of the first flange, a cylinder tip is further installed on the magnetic induction cylinder, the cylinder tip is fixedly connected to the center of the first flange, the cylinder tip and the cylinder telescopic rod are sealed and connected by a combination spacer, a second flange is installed between the upper cylinder and the intermediate cylinder, the upper cylinder and the intermediate cylinder are connected by the second flange, and the cylinder telescopic rod of the magnetic induction cylinder passes through a through hole at the center of the second flange and enters the intermediate cylinder.

6. 2. The testing device for measuring the strength of gas-solid bonded coal rock according to claim 1, wherein the conductive slide rail comprises a conductive copper sheet and an organic glass plate groove, the organic glass plate groove is fixed to the inner wall of the upper cylinder, and the conductive copper sheet is fixedly engaged with the organic glass plate groove.

7. 2. The testing device for measuring the strength of gas-solid bonded coal rock according to claim 1, wherein the lower cylinder is a coal sample storage cylinder, the lower cylinder includes a coal sample tank and a coal sample mortar, the coal sample mortar is engaged and fitted to the outside of the coal sample tank, the coal sample mortar is higher than the coal sample tank, a press ring is installed at the connection point between the lower cylinder and the intermediate cylinder, the press ring is engaged between the upper end mouth of the coal sample mortar and the intermediate cylinder to realize a seal between the intermediate cylinder and the lower cylinder, and the inner diameter of the coal sample mortar corresponds to the outer diameter of the coal sample tank.

8. A test method for measuring the strength of gas-solid-bound coal rock, comprising the steps of: Step 1 includes a step of inspecting the airtightness of the test device for measuring the strength of gas-solid-bonded coal rock according to any one of claims 1 to 7, first placing the produced coal sample in the lower cylinder, and then realizing sealing with a press ring; a step of opening a first gate valve, filling the high-pressure gas in the high-pressure gas cylinder with the lower cylinder containing the coal sample of the pressure-maintaining drop weight device, and closing the first gate valve when the maximum pressure required for the experiment is reached by the booster pump and the pressure stabilizing device; a step of maintaining the pressure for 6 hours or more, observing whether the pressure changes, and if there is a change, the test device needs to be detected; and a step of degassing and evacuating the lower cylinder with the vacuum pump, and performing the next step of the experiment if there is no change; The lower cylinder containing the coal sample of the pressure-holding drop weight device is filled with methane gas CH ４ Step 2 includes a step of filling the lower cylinder with gas, degassing and evacuating the lower cylinder with the vacuum pump, opening the first gate valve and filling the gas, a step of transmitting data from the first pressure sensor, the second pressure sensor and the flow rate sensor to a computer by a data collection device, and a step of holding the data for 24 hours or more to allow the gas to be sufficiently adsorbed into the coal sample, recording a final balance pressure and closing the first gate valve; and (c) a step 3 including a step of testing the strength of the coal rock in a gas-solid bonded state, the step 3 including a step of testing the strength of the coal rock under a predetermined pressure condition by operating the operation panel of the electric control box to perform a drop weight test after testing the strength of the coal rock and balancing the adsorption of the coal sample, and a step 3 including a step of repeating the above steps 1 and 2 to test the strength of the coal rock under different gas pressure conditions.

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