Gas-containing coal body polyenergy blasting fracturing simulation test bed and use method thereof

Abstract

The present application relates to the technical field of simulation test bed, especially to the gas-containing coal body's polyenergy blasting fracturing simulation test bed and its using method. Technical scheme: the gas-containing coal body's polyenergy blasting fracturing simulation test bed and its using method include the first control console, test observation integrated module, ignition assembly, second control console, first gas cylinder and second gas cylinder; through the test observation integrated module, the communication is set between the first control console and the second control console, integrated one body is formed, the simulation performance of gas-containing coal body polyenergy blasting fracturing is improved, through the ignition assembly, multiple delivery pipes are set, any node or multiple nodes are selected to ignite, the maximum simulation is increased, the gas can be ignited to produce blasting test, wherein the high-pressure glass roadway simulation pipe in the test observation integrated module is provided with multiple floating points along the side wall, multiple node detection is formed, and the overall simulation test effect is improved.

Description

Technical Field

[0001] This invention relates to the field of simulation test bench technology, and in particular to a shaped charge blasting fracturing simulation test bench for gas-containing coal bodies and its usage method. Background Technology

[0002] Gas-bearing coal seams refer to coal seams or coal bodies containing methane gases, which are released during coal mining. These gases primarily consist of methane and carbon dioxide. Gas-bearing coal seams are characterized by high methane content and easy release; if not properly managed, they can easily lead to serious safety accidents such as gas explosions and coal and gas outbursts during mining. To gain a deeper understanding of the fracturing mechanism of gas-bearing coal seams under blasting, researchers typically simulate shaped charge blasting under different methane pressures and observe the formation and propagation of cracks in the coal seam, thus providing a direct basis for the development of relevant safety measures.

[0003] However, current simulation test systems, typically composed of a media tank, a test chamber, and a control system, have certain limitations. The test chamber often only simulates simple roadway structures, which significantly restricts the accuracy and practical application range of the tests. Furthermore, the overly simplistic sensor deployment leads to limited data acquisition, making it difficult to comprehensively and accurately capture and record the changes in various parameters of the gas-bearing coal body during the blasting process. This, in turn, affects the overall effectiveness and reliability of the simulation test. Therefore, a simulation test bench for shaped charge blasting and fracturing of gas-bearing coal bodies can be designed. Summary of the Invention

[0004] The technical problem to be solved by this invention is: in order to overcome the fact that existing test chambers can only simulate simple roadway structures, which limits the accuracy and application scope of the test, the sensor deployment method is simple, the data acquisition is single, and it is difficult to comprehensively capture and record the changes of various parameters of gas and coal during the blasting process, thus reducing the overall simulation test effect.

[0005] The technical solution of this invention is as follows: This invention is a simulation test bench for shaped charge blasting and fracturing of gas-containing coal, comprising: an integrated test and observation module for simulating shaped charge blasting and fracturing of gas-containing coal; a first control console disposed on one side of the integrated test and observation module and connected to the integrated test and observation module; a second control console disposed on the other side of the integrated test and observation module and connected to the integrated test and observation module; an ignition assembly, wherein an ignition assembly for igniting gas to generate an explosive state is connected to the top of the integrated test and observation module; and a first gas cylinder disposed on the top of the first control console and adapted to supply gas to the integrated test and observation module. The module includes: a first gas cylinder, which is located on top of the second control console and is adapted to collect gas from the test observation integrated module; wherein the test observation integrated module includes: a high-pressure protection chamber, which has an internal cavity for high-pressure protection and buffering; a high-pressure glass tunnel simulation tube, wherein the high-pressure glass tunnel simulation tube is located at the center of the internal cavity, wherein gas from the first gas cylinder can be injected into the high-pressure glass tunnel simulation tube, and the second gas cylinder can extract gas from the high-pressure glass tunnel simulation tube; and a bottom support, which is located at the bottom of the high-pressure glass tunnel simulation tube and supports the high-pressure glass tunnel simulation tube in the high-pressure protection chamber.

[0006] Furthermore, the experimental observation integrated module also includes: a high-temperature sealing ring sleeve, with both ends of the high-pressure glass tunnel simulation tube equipped with a high-temperature sealing ring sleeve that is sealed to the high-pressure protective chamber; multiple sets of floating points for sensing the impact of shaped charge blasting are arranged along the circumferential edge of the side wall of the high-pressure glass tunnel simulation tube, and multiple sets of impact signal devices corresponding to the floating points are arranged along the circumferential edge of the outer end of the high-pressure glass tunnel simulation tube; an explosion-proof floating inner ring and an explosion-proof floating outer ring, with an explosion-proof floating inner ring and an explosion-proof floating outer ring arranged sequentially around the periphery of the high-pressure glass tunnel simulation tube; wherein, multiple sets of explosion-proof floating inner rings and explosion-proof floating outer rings are arranged in a circumferential manner, and a pressure relief gap is formed between the multiple sets of explosion-proof floating inner rings and explosion-proof floating outer rings; an impact rod, with an impact rod extending to the high-pressure protective chamber and a perforation for the impact rod to pass through sequentially on the multiple sets of explosion-proof floating inner rings and explosion-proof floating outer rings; a pressure sensor, which is arranged between the impact rod and the high-pressure protective chamber; and a flashing screen, with a flashing screen electrically provided at the outer end of the pressure sensor.

[0007] Furthermore, the sidewalls of the multiple sets of explosion-proof floating inner rings and explosion-proof floating outer rings are coated with a high-temperature resistant coating.

[0008] Furthermore, both the first and second consoles have a connection port on their opposite sides that connects to the test observation integration module. The connection port is equipped with a control valve. The side of the control valve facing the test observation integration module is covered with three layers of oscillation protection diaphragm. The first and second consoles have the same structure. A pressure plate is fixed to the bottom of the opposite end of the first and second consoles. An air compressor is provided at the far end of the first and second consoles.

[0009] Furthermore, the bottom of the pressure plate is provided with shock-absorbing brackets, and the inside of the shock-absorbing brackets is provided with shock-absorbing rubber dampers. The top of the pressure plate is symmetrically provided with floating plates, and a rubber damping layer is provided between the two sets of floating plates. The first control console and the second control console are both fixedly connected with detection modules for monitoring and controlling the gas content inside the pipeline. The detection modules include a meter, an ignition control module and a signal statistics module. The first control console and the second control console are both provided with data display screens and control buttons. The bottom outer side of the first control console and the second control console are provided with maintenance doors. The side of the first control console and the second control console away from the data display screen is provided with a back panel. Multiple sets of rear racks are horizontally provided on the back panel. The end of the rear rack away from the back panel is provided with a pedal.

[0010] Furthermore, the ignition assembly includes: a balance frame, both ends of which are fixedly connected to the first control console and the second control console; multiple sets of delivery pipes, with multiple sets of delivery pipes arranged along the edge of the balance frame, and multiple sets of rubber shock absorbers fitted along the edge of the delivery pipes, and an ignition check valve at the lower end of the delivery pipes; and an ignition module, with an ignition module at the top of the delivery pipes, and a heat insulation sleeve fitted around the ignition module.

[0011] Furthermore, the first gas cylinder and the second gas cylinder have the same structure; the first gas cylinder includes: a cylinder body, on the top of which is provided with an electromagnetic control valve; a pressure sensor, inside which the electromagnetic control valve is provided with a pressure sensor; and a signal light cover, which is detachably provided on the top of the electromagnetic control valve; wherein, the outer end of the electromagnetic control valve is connected to an air inlet pipe, the outer end of the pressure sensor is provided with a control cable, the bottom of the first gas cylinder is provided with an input pipe, and the outer periphery of the first gas cylinder is covered with an airtight sleeve.

[0012] This invention also discloses a method for using a shaped charge blasting fracturing simulation test bench for gas-containing coal bodies, comprising the following steps:

[0013] S1. Connect the dilution gas pipe to the air inlet pipe, remove the detachable signal light cover, and put the gas-containing coal into the first gas cylinder for storage. Adjust the parameters on the data display screen by controlling the button. The air compressor evacuates and reduces the pressure inside the high-pressure glass tunnel simulation tube to simulate tunnel conditions. Excess gas is discharged through the second control console to the second gas cylinder. After the pressure sensor detects a certain concentration, the dilution gas enters the first gas cylinder to reduce the gas concentration. The synchronous electromagnetic control valve opens and gradually sends gas into the high-pressure glass tunnel simulation tube in the test observation integrated module. The metering device, ignition control module and signal statistics module control the amount of gas entering each time. After the test capacity is reached, the electromagnetic control valve is closed.

[0014] S2. Then wait for a period of time to allow the gas to fill the entire high-pressure glass tunnel simulation tube, simulating the gas flow state. The electronic ignition component is activated, and the ignition module drives the ignition check valve controlled by the delivery pipe. Multiple delivery pipes are set up, and any node or multiple nodes can be selected for ignition according to the needs, increasing the maximum simulation.

[0015] S3. Instantaneous contact between the flame and gas at any or multiple nodes causes rapid explosion. The explosion intensity quickly fills the high-pressure glass tunnel simulation tube and collides with the floating point. The floating point is connected to the impact signal device, which rapidly agitates and collides the impact rod, causing the impact rod to contact the pressure contactor. The kinetic energy is converted into an electrical signal and transmitted to the flashing screen. With the explosion intensity, the flashing screen will flash the corresponding intensity data, which can be seen intuitively. As the intensity spreads, the explosion-proof floating inner ring and the explosion-proof floating outer ring are set in a ring direction to form an enclosed layer with progressively decreasing intensity outward, forming a safe pressure relief protection. Using the pressure relief gap, located between multiple sets of explosion-proof floating inner rings and explosion-proof floating outer rings, the intensity impact is gradually reduced. Using the rubber shock absorber, the impact force can be offset in the opposite direction at the moment of ignition, forming structural protection.

[0016] S4. After completing one test, the electromagnetic control valve is opened, and the gas enters the second control console, passes through the input pipe to the second gas cylinder, rises through the inlet pipe, and is discharged into the next mechanism. The concentration parameters are adjusted, and then the test steps are repeated.

[0017] The beneficial effects of this invention are:

[0018] 1. In the past, test chambers had limitations in simulating roadway structures, often only able to simulate simple structures, which greatly limited the accuracy and application scope of the tests. At the same time, the sensor deployment was too simplistic, resulting in limited data acquisition and making it difficult to comprehensively capture and record the changes in various parameters of the gas and coal body during blasting.

[0019] This design incorporates a first control console and a second control console for flexible adjustment of gas injection and recovery. The top of the first control console is horizontally equipped with a first gas cylinder and a second gas cylinder, arranged in three groups. This allows for single or simultaneous injection and recovery of gas into the experimental observation integrated module, achieving a single cycle operation. Depending on the gas concentration, parameters can be adjusted to achieve optimal burst test results. The experimental observation integrated module is cleverly positioned between the first and second control consoles, forming an integrated design. This design not only improves the simulation performance of gas-coal shaped charge bursting and fracturing but also makes the entire experimental system more compact and efficient. Multiple delivery pipes are incorporated through the ignition assembly, allowing for flexible selection of any or multiple nodes for ignition. This improvement significantly increases the diversity and maximizing the simulation's accuracy, enabling the test to more realistically reflect actual conditions. The high-pressure glass tunnel simulation pipe inside the experimental observation integrated module has multiple floating points circumferentially arranged along its sidewalls. These floating points form a multi-node detection system, comprehensively capturing and recording various parameter changes in the gas-coal body during the bursting process, thereby significantly improving the accuracy and effectiveness of the overall simulation test. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the simulation test bench of the present invention;

[0021] Figure 2 This is a schematic diagram of the first control console of the simulation test bench of the present invention;

[0022] Figure 3 This is a schematic diagram of the first control console of the simulation test bench of the present invention from another angle;

[0023] Figure 4 This is a schematic diagram of the integrated test observation module of the simulation test bench of the present invention;

[0024] Figure 5 This is a schematic diagram of the high-pressure glass tunnel simulation pipe of the simulation test bench of the present invention;

[0025] Figure 6 This is a schematic diagram of the ignition assembly of the simulation test bench of the present invention;

[0026] Figure 7 This is a schematic diagram of the ignition assembly of the simulation test bench of the present invention from another angle;

[0027] Figure 8 This is a schematic diagram of the first gas cylinder of the simulation test bench of the present invention.

[0028] Explanation of reference numerals in the attached drawings: 1. First control console; 2. Test observation integrated module; 3. Ignition assembly; 4. Second control console; 5. First gas cylinder; 6. Second gas cylinder; 101. Air compressor; 102. Maintenance door; 103. Control button; 104. Data display screen; 105. Pressure plate; 106. Shock absorber bracket; 107. Back plate; 108. Rear frame; 109. Pedal; 110. Floating plate; 111. Rubber damping layer; 201. Flashing screen; 202. Pressure sensor; 203. Inner cavity; 204. High-temperature sealing ring; 205. Explosion-proof floating inner ring; 206. Explosion-proof floating outer ring ; 207. Perforation; 208. High-pressure glass tunnel simulation pipe; 209. Floating point; 210. Impact rod; 211. Impact signal device; 212. Base support; 213. High-pressure protective chamber; 214. High-temperature resistant coating; 301. Balance frame; 302. Fixing block; 303. Conveying pipe; 304. Ignition module; 305. Rubber shock absorber; 306. Thermal insulation sleeve; 307. Ignition check valve; 501. Electromagnetic control valve; 502. Air pressure sensor; 503. Removable signal light cover; 504. Air inlet pipe; 505. Input pipe; 506. Control cable; 507. Airtight sleeve. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0031] Please see Figure 1 This invention provides an embodiment of a simulated test bench for shaped charge blasting and fracturing of gas-containing coal, comprising a first control console 1, a test observation integrated module 2, an ignition component 3, a second control console 4, a first gas cylinder 5, and a second gas cylinder 6; the first control console 1 and the second control console 4 are configured to adjust gas injection and recovery and parameter adjustment, respectively; the test observation integrated module 2 for simulating shaped charge blasting and fracturing of gas-containing coal is connected between the first control console 1 and the second control console 4; the ignition component 3 for igniting gas to generate an explosive state is connected to the top of the test observation integrated module 2; three sets of first gas cylinders 5 connected to the test observation integrated module 2 for injecting gas are horizontally arranged on the top of the first control console 1; and three sets of second gas cylinders 6 connected to the test observation integrated module 2 for recovering gas are horizontally arranged on the top of the second control console 4.

[0032] Please see Figure 1-3In this embodiment, both the first control console 1 and the second control console 4 have a communication port on their opposite sides that connects to the test observation integrated module 2. A control valve is installed inside the communication port, and the side of the control valve facing the test observation integrated module 2 is covered with a three-layer vibration protection diaphragm. The first control console 1 and the second control console 4 have the same structure. A pressure plate 105 is fixedly connected to the bottom of one of the opposite ends of the first control console 1 and the second control console 4. An air compressor 101 is installed at the opposite end of the first control console 1 and the second control console 4. Shock-absorbing supports 106 are distributed at the bottom of the pressure plate 105, and shock-absorbing rubber dampers are installed inside the shock-absorbing supports 106. Floating plates 110 are symmetrically arranged on the top of the pressure plate 105. A rubber damping layer 111 is provided between the two sets of floating plates 110. The first control console 1 and the second control console 4 are both fixed with a detection module for monitoring and controlling the gas content inside the pipeline. The detection module includes a meter, an ignition control module and a signal statistics module. The first control console 1 and the second control console 4 are both equipped with a data display screen 104 and control buttons 103. The bottom outer side of the first control console 1 and the second control console 4 is provided with a maintenance door 102. The side of the first control console 1 and the second control console 4 away from the data display screen 104 is provided with a back plate 107. Multiple sets of rear racks 108 are horizontally arranged on the back plate 107. The end of the rear rack 108 away from the back plate 107 is provided with a pedal 109.

[0033] The design of the first control console 1 and the second control console 4 fully considers the accuracy, safety, and convenience of the experiment. Both consoles have a connection port on their opposite sides that connects to the experimental observation integration module 2, and incorporate control valves to ensure precise gas control during the experiment. The side of the control valve facing the experimental observation integration module is further covered with a three-layer vibration protection diaphragm, effectively isolating external interference and ensuring experimental stability. Simultaneously, the first and second control consoles adopt the same structural design for ease of operation and management. In terms of structural strength and vibration damping, a pressure plate 105 is fixed to the bottom of the opposite end of the first control console 1 and the second control console 4, enhancing the overall load-bearing capacity. The vibration damping bracket 106 at the bottom of the pressure plate and the internal vibration damping rubber damper effectively absorb vibrations during the experiment, improving the durability of the equipment. Furthermore, the floating plate 110 at the top of the pressure plate and the rubber damping layer 111 between the two floating plates further enhance the vibration damping effect, ensuring the accuracy of the experiment.

[0034] In terms of monitoring and control, both the first control console 1 and the second control console 4 are internally equipped with detection modules, including a metering device, an ignition control module, and a signal statistics module. These modules can monitor the gas content inside the pipeline in real time and perform precise control as needed. In particular, the ignition control module is model RSB-07, and the metering device is model GHTH1000, ensuring the accuracy and reliability of the test.

[0035] Please see Figure 4-6In this embodiment, the experimental observation integrated module 2 includes a flashing screen 201, a touch device 202, an inner cavity 203, a high-temperature sealing ring 204, an explosion-proof floating inner ring 205, an explosion-proof floating outer ring 206, a perforation 207, a high-pressure glass tunnel simulation tube 208, a floating point 209, an impact rod 210, an impact signal device 211, a base support 212, and a high-pressure protection chamber 213. The high-pressure protection chamber 213 has an inner cavity 203 for high-pressure protection and buffering, and a high-pressure protection device is located at the center of the inner cavity 203. The high-pressure glass tunnel simulation tube 208 has a bottom support 212 symmetrically provided at the bottom, which is integrally formed with the high-pressure protective chamber 213 to maintain overall stability. Both ends of the high-pressure glass tunnel simulation tube 208 are provided with high-temperature sealing rings 204. The side wall of the high-pressure glass tunnel simulation tube 208 is provided with multiple floating points 209 for sensing the impact of shaped charge blasting. The outer end of the high-pressure glass tunnel simulation tube 208 is provided with multiple impact signalers 211 corresponding to the floating points 209.

[0036] Please see Figure 5-7 In this embodiment, an explosion-proof floating inner ring 205 and an explosion-proof floating outer ring 206 are sequentially arranged around the periphery of the high-pressure glass tunnel simulation pipe 208. Multiple sets of the explosion-proof floating inner ring 205 and explosion-proof floating outer ring 206 are arranged in a circumferential manner, forming a pressure relief gap between them. Impact rods 210 extending to the high-pressure protective chamber 213 are sequentially inserted through the multiple sets of explosion-proof floating inner rings 205 and explosion-proof floating outer rings 206. Perforations 207 corresponding to the impact rods 210 are opened on the multiple sets of explosion-proof floating inner rings 205 and explosion-proof floating outer rings 206. A pressure sensor 202 is provided between the impact rod 210 and the high-pressure protective chamber 213. A flashing screen 201 is electrically provided at the outer end of the pressure sensor 202. The sidewalls of multiple sets of explosion-proof floating inner rings 205 and explosion-proof floating outer rings 206 are coated with a high-temperature resistant coating 214. The ignition assembly 3 includes a balance frame 301, a fixing block 302, a delivery pipe 303, an ignition module 304, a rubber shock absorber 305, a heat insulation sleeve 306, and an ignition one-way valve 307. Both ends of the balance frame 301 are provided with fixing blocks 302 that are fixed to the first control console 1 and the second control console 4. Multiple sets of delivery pipes 303 are arranged along the edge of the balance frame 301. Multiple sets of rubber shock absorbers 305 are sleeved along the edge of the delivery pipes 303. An ignition one-way valve 307 is provided at the lower end of the delivery pipes 303. An ignition module 304 is provided at the top of the delivery pipes 303. A heat insulation sleeve 306 is sleeved around the ignition module 304.

[0037] The explosion-proof floating inner ring 205 and explosion-proof floating outer ring 206, sequentially nested around the high-pressure glass tunnel simulation tube, not only enhance the structural stability through multiple circumferential arrangements but also cleverly form a pressure relief gap, effectively mitigating the pressure impact generated by the explosion. Simultaneously, multiple impact rods 210 penetrate these explosion-proof rings and connect to the pressure sensor 202 within the high-pressure protective chamber 213. Once triggered, they provide rapid feedback via the flashing screen 201, enabling real-time monitoring and early warning of the explosion process. The sidewalls of the explosion-proof floating inner and outer rings are coated with a high-temperature resistant coating 214. This design significantly improves the simulation tube's tolerance to high-temperature environments, ensuring the continuity and accuracy of the experiment. The high-temperature resistant coating 214 is formulated from heat-resistant resins (such as silicone, polytitanate, aromatic heterocyclic polymers, etc.), heat-resistant pigments (such as mica, iron oxide, graphite, etc.), and various fillers.

[0038] Please see Figure 8 In this embodiment, the first gas cylinder 5 and the second gas cylinder 6 have the same structure. The top of the first gas cylinder 5 is provided with an electromagnetic control valve 501. The inside of the electromagnetic control valve 501 is provided with a pressure sensor 502. The top of the electromagnetic control valve 501 is provided with a detachable signal light cover 503. The outer end of the electromagnetic control valve 501 is connected to an air inlet pipe 504. The outer end of the pressure sensor 502 is provided with a control cable 506. The pressure sensor 502 is model XMSJGY-BMP280-3.3V. The bottom of the first gas cylinder 5 is provided with an input pipe 505. The outer periphery of the first gas cylinder 5 is covered with an airtight sleeve 507.

[0039] According to another aspect of the present invention, a method for using a shaped charge blasting fracturing simulation test bench for gas-bearing coal is provided, comprising the following steps:

[0040] S1. Connect the dilution gas pipe using the air inlet pipe 504, remove the detachable signal light cover 503, and sequentially put the gas-containing coal into the first gas cylinder 5 for storage. Adjust the parameters on the data display screen 104 by controlling the button 103. The air compressor 101 evacuates and reduces the internal air pressure of the high-pressure glass tunnel simulation pipe 208 to simulate tunnel conditions. Excess gas is discharged through the second control console 4 to the second gas cylinder 6. After the air pressure sensor 502 detects a certain concentration, the dilution gas enters the first gas cylinder 5 to reduce the gas concentration. The synchronous electromagnetic control valve 501 opens and gradually sends gas into the high-pressure glass tunnel simulation pipe 208 in the test observation integrated module 2. The metering device, ignition control module and signal statistics module control the amount of gas entering each time. After the test capacity is reached, the electromagnetic control valve 501 is closed.

[0041] S2. Then wait for a period of time to allow the gas to fill the entire high-pressure glass tunnel simulation tube 208, simulating the gas flow state. The electronic ignition component 3 is activated, and the ignition module 304 drives the ignition check valve 307, which is controlled by the delivery pipe 303. Multiple delivery pipes 303 are set up, and any node or multiple nodes can be selected for ignition according to the requirements to increase the maximum simulation.

[0042] S3. Instantly, any one or more nodes of the flame come into contact with the gas and cause a rapid explosion. The explosion intensity quickly fills the high-pressure glass tunnel simulation tube 208 and collides with the floating point 209. The floating point 209 is connected to the impact signal device 211 to rapidly agitate and collide with the impact rod 210, causing the impact rod 210 to contact the pressure contactor 202. The kinetic energy is converted into an electrical signal and transmitted to the flashing screen 201. With the explosion intensity, the flashing screen 201 will flash the corresponding intensity data, which can be seen intuitively. As the intensity spreads, the explosion-proof floating inner ring 205 and the explosion-proof floating outer ring 206 are arranged in a ring direction to form an enclosed layer with progressively decreasing outward intensity, forming a safe pressure relief protection. Using the pressure relief gap, located between multiple sets of explosion-proof floating inner rings 205 and explosion-proof floating outer rings 206, the intensity impact is gradually reduced. Using the rubber shock absorber 305, the impact force can be offset in the opposite direction at the moment of ignition, forming structural protection.

[0043] S4. After completing one test, the control valve is opened, and the gas enters the second control console 4, passes through the input pipe 505 to the second gas cylinder 6, rises through the inlet pipe 504 and is discharged into the next mechanism. The concentration parameters are adjusted, and then the test steps are repeated.

[0044] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A simulation test bench for shaped charge blasting fracturing of gas-bearing coal seams, characterized in that, include: An integrated experimental observation module for simulating fracturing caused by shaped charge blasting in gas-fired coal bodies (2); The first console (1) is located on one side of the test observation integration module (2) and is connected to the test observation integration module (2); The second console (4) is located on the other side of the test observation integration module (2) and is connected to the test observation integration module (2); Ignition assembly (3), the top of the test observation integrated module (2) is connected to an ignition assembly (3) for igniting the gas to produce an explosive state; The first gas cylinder (5) is located on top of the first control console (1) and is adapted to inject gas into the test observation integrated module (2); The second gas cylinder (6) is located on top of the second control console (4) and is adapted to collect the gas in the test observation integration module (2); The experimental observation integration module (2) includes: The high-pressure protection chamber (213) has an internal cavity (203) for high-pressure protection and buffering. High-pressure glass tunnel simulation tube (208), the center of the inner cavity (203) is provided with high-pressure glass tunnel simulation tube (208), wherein the gas in the first gas cylinder can be injected into the high-pressure glass tunnel simulation tube (208), and the second gas cylinder can extract the gas in the high-pressure glass tunnel simulation tube (208); A bottom support (212) is provided at the bottom of the high-pressure glass tunnel simulation tube (208) and supports the high-pressure glass tunnel simulation tube (208) inside the high-pressure protection chamber (213); The experimental observation integration module (2) also includes: High-temperature sealing ring (204): Both ends of the high-pressure glass tunnel simulation pipe (208) are provided with the high-temperature sealing ring (204) which is sealed to the high-pressure protection chamber (213). The high-pressure glass tunnel simulation tube (208) has multiple floating points (209) along its sidewall circumferentially for sensing the impact of shaped charge blasting. The high-pressure glass tunnel simulation tube (208) also has multiple impact signalers (211) corresponding to the floating points (209) along its outer circumferentially. An explosion-proof floating inner ring (205) and an explosion-proof floating outer ring (206) are sequentially arranged around the periphery of the high-pressure glass tunnel simulation pipe (208); wherein, the explosion-proof floating inner ring (205) and the explosion-proof floating outer ring (206) are arranged in multiple sets in a ring direction, and a pressure relief gap is formed between the multiple sets of explosion-proof floating inner rings (205) and explosion-proof floating outer rings (206). Impact rod (210), multiple sets of explosion-proof floating inner rings (205) and explosion-proof floating outer rings (206) are sequentially provided with impact rods (210) extending to the high-pressure protective chamber (213) and perforations (207) for the impact rods (210) to pass through. A pressure device (202) is disposed between the impact rod (210) and the high-pressure protective chamber (213); A flashing screen (201) is electrically provided at the outer end of the touch sensor (202).

2. The shaped charge blasting fracturing simulation test bench for gas-bearing coal bodies according to claim 1, characterized in that, The sidewalls of the multiple sets of explosion-proof floating inner rings (205) and explosion-proof floating outer rings (206) are all coated with a high-temperature resistant coating (214).

3. The shaped charge blasting fracturing simulation test bench for gas-bearing coal bodies according to claim 2, characterized in that, The first console (1) and the second console (4) each have a communication port on their opposite sides that connects to the test observation integration module (2). The communication port is equipped with a control valve. The control valve is covered with a three-layer oscillation protection diaphragm on the side facing the test observation integration module (2). The first console (1) and the second console (4) have the same structure. A pressure plate (105) is fixed to the bottom of the opposite end of the first console (1) and the second console (4). An air compressor (101) is provided at the far end of the first console (1) and the second console (4).

4. The shaped charge blasting fracturing simulation test rig for gas-bearing coal bodies according to claim 3, characterized in that, The bottom of the pressure plate (105) is provided with shock-absorbing brackets (106), and the inside of the shock-absorbing brackets (106) is provided with shock-absorbing rubber dampers. The top of the pressure plate (105) is symmetrically provided with floating plates (110), and a rubber damping layer (111) is provided between the two sets of floating plates (110). The first control console (1) and the second control console (4) are both fixedly connected with detection modules for monitoring and controlling the gas content inside the pipeline. The detection modules include a meter, an ignition control module and a signal statistics module. The first control console (1) and the second control console (4) are both provided with data display screens (104) and control buttons (103). The bottom outer side of the first control console (1) and the second control console (4) is provided with maintenance doors (102). The side of the first control console (1) and the second control console (4) away from the data display screen (104) is provided with a back plate (107). Multiple sets of rear racks (108) are horizontally provided on the back plate (107). The end of the rear rack (108) away from the back plate (107) is provided with a pedal (109).

5. The shaped charge blasting fracturing simulation test bench for gas-bearing coal bodies according to claim 4, characterized in that, The ignition assembly (3) includes: The balance frame (301) has a fixing block (302) at both ends that is fixed to the first control console (1) and the second control console (4). Multiple sets of delivery pipes (303) are provided along the edge of the balance frame (301), and multiple sets of rubber shock absorbers (305) are sleeved along the edge of the delivery pipes (303). An ignition check valve (307) is provided at the lower end of the delivery pipes (303). Ignition module (304), the top of the delivery pipe (303) is provided with ignition module (304), and the outer periphery of ignition module (304) is provided with heat insulation sleeve (306).

6. The shaped charge blasting fracturing simulation test bench for gas-bearing coal bodies according to claim 5, characterized in that, The first gas cylinder (5) and the second gas cylinder (6) have the same structure. The first gas cylinder (5) includes: The bottle body has an electromagnetic control valve (501) on its top. A pressure sensor (502) is provided inside the electromagnetic control valve (501). The signal light cover (503) is detachably mounted on top of the solenoid control valve (501); Among them, the outer end of the electromagnetic control valve (501) is connected to the air inlet pipe (504), the outer end of the air pressure sensor (502) is provided with a control cable (506), the bottom of the first gas cylinder (5) is provided with an input pipe (505), and the outer periphery of the first gas cylinder (5) is provided with an airtight sleeve (507).

7. A method for using a shaped charge blasting fracturing simulation test bench for gas-bearing coal, comprising the shaped charge blasting fracturing simulation test bench for gas-bearing coal as described in claim 6, characterized in that, Includes the following steps: S1. Connect the dilution gas pipe using the air inlet pipe (504), remove the detachable signal lamp cover (503), and put the gas-containing coal into the first gas cylinder (5) for storage. Adjust the parameters on the data display screen (104) by controlling the button (103). The air compressor (101) evacuates and reduces the internal air pressure of the high-pressure glass tunnel simulation tube (208) to simulate the tunnel conditions. Excess gas is discharged through the second control console (4) to the second gas cylinder (6). After the air pressure sensor (502) senses a certain concentration, the dilution gas enters the first gas cylinder (5) to reduce the gas concentration. The synchronous electromagnetic control valve (501) is opened, and gas is gradually sent into the high-pressure glass tunnel simulation tube (208) in the test observation integrated module (2). The meter, ignition control module and signal statistics module control the amount of gas entering each time. After the test capacity is reached, the electromagnetic control valve (501) is closed. S2. Then wait for a period of time to allow the gas to fill the entire high-pressure glass tunnel simulation tube (208) to simulate the gas flow state. The electronic ignition assembly (3) is started, and the ignition module (304) drives the ignition check valve (307) to be controlled by the delivery pipe (303). Multiple delivery pipes (303) are set up so that any node or multiple nodes can be selected for ignition according to the requirements, thereby increasing the maximum simulation. S3. At any one or more nodes, the flame comes into contact with the gas and causes a rapid explosion. The explosion intensity quickly fills the high-pressure glass tunnel simulation tube (208) and collides with the floating point (209). The floating point (209) is connected to the impact signal device (211) to rapidly agitate and collide with the impact rod (210), so that the impact rod (210) contacts the pressure device (202). The kinetic energy is converted into an electrical signal and transmitted to the flashing screen (201). With the explosion intensity, the corresponding intensity data will flash on the flashing screen (201), and the test status can be seen intuitively. As the intensity spreads, the explosion-proof floating inner ring (205) and the explosion-proof floating outer ring (206) are arranged in a ring direction to form an enclosed layer-by-layer decreasing outward intensity, forming a safe pressure relief protection. Using the pressure relief gap, located between multiple sets of explosion-proof floating inner rings (205) and explosion-proof floating outer rings (206), the intensity influence is gradually reduced. Using the rubber shock absorber (305), the impact force can be offset in the opposite direction at the moment of ignition, forming structural protection. S4. After completing one test, the control valve is opened, the gas enters the second control console (4), passes through the input pipe (505) to the second gas cylinder (6), rises through the inlet pipe (504) and is discharged into the next mechanism. The concentration parameters are adjusted, and then the test steps are repeated.

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