Drill hole draw-out type ventilation and dust prevention simulation test device for driving working face

Abstract

The invention provides a driving face drilling draw-out type ventilation dustproof simulation test device which comprises a simulation assembly, a mounting assembly, a test assembly and a spraying assembly, the interior of the top end of the simulation assembly is connected with a ventilation mechanism through a support, and a powder spraying mechanism is fixedly mounted at the bottom of the ventilation mechanism; the mounting assembly is fixedly mounted on one side of the roadway model, the mounting assembly comprises a mounting plate, a plurality of threaded holes are formed in the middle of the mounting plate, and adjusting mechanism test assemblies are connected into the threaded holes; the test assembly is fixedly mounted on the side wall of the mounting assembly; the spraying assembly is rotatably connected with the top of the tunnel model. The grouped suction type dust concentration instruments oppositely arranged in the simulation roadway can adjust suction negative pressure and are used for simulating and monitoring suction effects under different negative pressure conditions, the drilling ventilation and dust removal effects of the roadway under different dust concentration, particle size composition and moisture content conditions are simulated through equal-proportion scaling of the roadway and the drilling holes, and the drilling efficiency of the roadway is improved. And basic data is provided for the design of the large-diameter drill hole for ventilation and dust removal.

Description

Technical Field

[0001] The invention relates to a drilling and extraction ventilation and dust prevention simulation test device for an excavation working face, belonging to the technical field of coal mining. Background Art

[0002] With the increasing mechanization of coal mine excavation faces and the increasing intensity of tunnel model excavation, dust generation in excavation faces has increased dramatically, and the problem of dust pollution and its elimination has become increasingly prominent. Currently, the main means of dust control in excavation faces are machine-mounted dust removal at the face, ventilation with long-pressure, short-extraction, dry dust collectors, transfer point spraying, and tunnel model water curtains. While these methods have achieved significant results, they still face challenges such as weak water mist dust capture, limited dust removal fans' ability to inhale and purify dust-laden airflow, and significant exposure of excavation face personnel to dust-laden airflow.

[0003] Currently, underground directional drilling capabilities in coal mines are continuously improving, along with directional accuracy. Extraction-type ventilation and dust removal technology based on large-diameter boreholes has begun to be applied, with some success. Extraction-type ventilation and dust removal technology for large-diameter boreholes is an effective method for improving the working environment and reducing dust pollution during drilling operations. Extraction-type ventilation and dust removal technology primarily utilizes ventilators to extract contaminated air (containing dust and harmful gases) from the borehole or work area to maintain fresh air in the tunnel model or work area, thereby improving labor hygiene. This technology is often combined with dust removal equipment to effectively control and collect dust.

[0004] Extraction-type ventilation and dust removal technology for large-diameter boreholes can improve labor hygiene, reduce dust pollution, and increase operational efficiency. However, as a new technology, the design method for large-diameter ventilation and dust removal boreholes is still immature. Currently, it mainly relies on numerical simulation and empirical methods, which has an impact on the ventilation and dust removal effect. Due to the complex environment within the tunnel model during excavation construction, the simulation results of large-diameter excavation face drilling are difficult to achieve the expected results. This can lead to large errors in subsequent dust control test data, making it difficult to achieve the optimal design of large-diameter boreholes and their extraction parameters under different conditions, thereby reducing the rigor of simulation tests. Summary of the Invention

[0005] In order to solve the technical problem of poor simulation accuracy of extraction-type ventilation and dust removal technology for large-diameter boreholes, the present invention provides a drilling extraction-type ventilation and dust prevention simulation test device for an excavation working face.

[0006] The present invention solves the above technical problems through the following technical solutions:

[0007] The present invention provides a tunneling working face drilling and extraction type ventilation and dust prevention simulation test device, the tunneling working face drilling and extraction type ventilation and dust prevention simulation test device comprising:

[0008] A simulation component, the simulation component is composed of a tunnel model, the top of the tunnel model is connected to the ventilation mechanism through a bracket, and a powder spraying mechanism is fixedly installed at the bottom of the ventilation mechanism;

[0009] A mounting assembly, the mounting assembly being fixedly mounted to one side of the tunnel model, the mounting assembly comprising a mounting plate, a plurality of threaded holes being formed in the middle of the mounting plate, and an adjustment mechanism being connected to the interior of the threaded holes;

[0010] A test assembly, wherein the test assembly is fixedly mounted to a side wall of the mounting assembly via a threaded hole;

[0011] A spray assembly is rotatably connected to the top of the tunnel model. The spray assembly is correspondingly arranged above the ventilation mechanism. One end of the spray assembly is fixedly connected to a rotating mechanism, and the rotating mechanism is movably installed inside the tunnel model.

[0012] In the present technical solution, a number of evenly distributed angle irons are fixedly installed on one side of the tunnel model, each angle iron is an L-shaped structure and is penetrated by bolts. A tunneling head is formed on one side of the tunnel model, and the angle iron is located on the inner wall of the tunnel model on the side of the tunneling head. The edge of the tunnel model is sealed and fits with the mounting plate, and the edge of the mounting plate is fixedly connected with a surrounding edge embedded in the inner wall of the tunnel model. The surrounding edge extends to the inside of the angle iron, and the bolts are threadedly connected to the inside of the surrounding edge for stable installation of the mounting plate.

[0013] In the present technical solution, the top of the tunnel model is fixedly connected to several evenly distributed brackets by screws, and the ventilation mechanism consists of a wind tube and a clamp assembly. Several clamps are fixedly installed on the surface of the wind tube, and each clamp is fixedly connected to the bottom end of the bracket. An air inlet and an air outlet are respectively provided at both ends of the wind tube. The air outlet is located on the side of the excavation head, and the distance between the air outlet and the excavation head is 3m. Several evenly distributed dust concentration sensors are fixedly installed on the inner wall of one side of the tunnel model, and adjacent dust concentration sensors are arranged at intervals of 1m. The distance between the dust concentration sensor and the excavation head is 1m, and the height of the dust concentration sensor is 0.5m.

[0014] In the present technical solution, the powder spraying mechanism consists of a powder spraying tube and a nozzle. The powder spraying tube is fixedly connected to a nozzle at the end. The nozzle is correspondingly arranged on one side of the wind tube, and the other end of the nozzle passes through the tunnel model and is connected to the storage box. The storage box is fixedly installed to the outer wall of the tunnel model, and the side wall of the storage box is fixedly connected to the pump body, and the pump body is connected to the powder spraying tube.

[0015] In this technical solution, a plurality of evenly distributed threaded holes are provided inside the mounting plate, and a plurality of plugs and adjustment mechanisms are threadedly connected inside the threaded holes. The adjustment mechanism is composed of a joint, and the joint and the test assembly are interconnected and are both located inside the threaded hole.

[0016] In the present technical solution, a flange is provided at one end of the joint and is fitted and connected to the inner wall of the mounting plate; a threaded tube is fixedly connected to one side of the joint on the surface of the flange; a screw sleeve is threadedly connected to the outer wall of the threaded tube, and the cross-section of the screw sleeve is a U-shaped structure; a plurality of evenly distributed baffles are fixedly connected to the surface of the flange located inside the threaded tube; the baffles are arc-shaped structures and adjacent edges are staggered and fitted; the baffles are located inside the screw sleeve, and the inner wall of one end of the screw sleeve is provided with an arc surface and contacts multiple baffles.

[0017] In this technical solution, the test assembly consists of a transparent tube and an end cap. There are several transparent tubes, one of which is threadedly connected to the inside of the threaded hole. The adjacent ends of the transparent tubes are threadedly connected to each other, and the transparent tubes are made of acrylic material and have the same outer diameter. One of the transparent tubes is threadedly connected to the end cap.

[0018] In the present technical solution, a number of evenly distributed pores are provided on the surface of the end head, and the interior of the end head is fixedly connected to the sleeve and the electric push rod respectively. The electric push rod is located inside the sleeve, and the telescopic end of the electric push rod is fixedly connected to the dust concentration meter, and one side of the dust concentration meter is fixedly connected to the air guide cover. A channel for air suction and transportation is formed between the air guide cover and the end head, and the other side of the dust concentration meter is fixedly connected to the guide sleeve, and the guide sleeve is movably sleeved on the surface of the sleeve, and the end of the guide sleeve is fixedly connected to the sealing ring, and the sealing ring is sealed and fits with the surface of the sleeve.

[0019] In this technical solution, the spray assembly consists of a transverse tube and a limit sleeve. The transverse tube is rotatably connected to the inside of the limit sleeve. The limit sleeve is fixedly installed to the top of the tunnel model. Several evenly distributed nozzles are fixedly connected to one side of the transverse tube. The middle part of the other side of the transverse tube is fixedly connected to a hose. The hose passes through the top of the tunnel model and is connected to the water pump, and the water pump is fixedly installed to the top of the tunnel model.

[0020] In this technical solution, the horizontal tube is arranged on one side of the tunneling head, and the distance between the horizontal tube and the tunneling head is 1m. A rotating mechanism is provided at one end of the horizontal tube, and the rotating mechanism is composed of a rocker arm. One end of the horizontal tube is fixedly connected to the rocker arm, and the other end of the rocker arm is rotatably connected to the telescopic end of the cylinder, and the cylinder is obliquely arranged inside the top of the tunnel model and rotatably connected to the side wall of the tunnel model.

[0021] On the basis of conforming to the common sense in this field, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present invention.

[0022] The positive progress effect of the present invention is:

[0023] The proposed tunneling face drilling extraction ventilation and dust prevention simulation test device simulates dust distribution on the tunneling face and optimizes the design of large-diameter boreholes and their extraction parameters under different conditions by adjusting parameters such as borehole diameter, length, inclination, and dust suction negative pressure. It also achieves a reasonable distribution of drill rod positions during large-diameter tunneling face drilling simulation, ensuring that the drill rod layout range is consistent with actual construction. Adjustments to the suction dust pressure and concentration are conveniently made, as well as adjustments to the drill rod length and air intake volume, facilitating and quickly arranging the test device and improving the accuracy of subsequent simulation tests. Water mist and dust simulation is performed within a tunnel model to ensure that the test environment conforms to actual construction conditions. Experimental data is acquired by monitoring dust concentration within the tunnel model, and the direction and angle of water mist and dust transport can be adjusted based on actual conditions. By scaling the tunnel and the borehole proportionally, the ventilation and dust removal effects of the tunnel under different dust concentrations, particle size compositions, and moisture contents are simulated, providing basic data for the design of large-diameter drill holes for ventilation and dust removal and ensuring the reliability and accuracy of the experimental data. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention.

[0025] Figure 2 It is a schematic diagram of the three-dimensional structure of the air duct of the present invention.

[0026] Figure 3 It is a schematic diagram of the three-dimensional structure of the bottom of the tunnel model of the present invention.

[0027] Figure 4 It is a schematic diagram of the partial three-dimensional structure of the air duct of the present invention.

[0028] Figure 5 It is a schematic diagram of the partial three-dimensional structure of the transparent tube of the present invention.

[0029] Figure 6 For the present invention Figure 5 Schematic diagram of the locally enlarged structure at point A in the middle.

[0030] Figure 7 For the present invention Figure 5 Schematic diagram of the locally enlarged structure at point B in the middle.

[0031] Figure 8 It is a schematic diagram of the half-section structure of the present invention.

[0032] Figure 9 It is a schematic diagram of the local three-dimensional structure of the tunnel model of the present invention.

[0033] Figure 10 It is a schematic diagram of the partial three-dimensional structure of the edge of the present invention.

[0034] Description of Reference Numerals

[0035] 100. Simulation components; 101. Tunnel model; 102. Angle iron; 103. Bolts; 104. Bracket; 105. Clamp; 106. Air duct; 107. Powder spraying hose; 108. Spray nozzle; 109. Storage tank; 110. Pump body; 111. Dust concentration sensor; 112. Heading of tunneling;

[0036] 200, mounting assembly; 201, mounting plate; 202, threaded hole; 203, plug; 204, connector; 205, threaded pipe; 206, baffle; 207, screw sleeve; 208, surrounding edge;

[0037] 300, test assembly; 301, transparent tube; 302, end; 303, fine hole; 304, sleeve; 305, electric push rod; 306, dust concentration meter; 307, deflector; 308, guide sleeve; 309, sealing ring; 310, channel;

[0038] 400, spray assembly; 401, cross pipe; 402, limit sleeve; 403, hose; 404, water pump; 405, nozzle; 406, rocker arm; 407, cylinder. DETAILED DESCRIPTION

[0039] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0040] like Figure 1-10 As shown, the drilling and extraction ventilation and dust prevention simulation test device for the excavation working face includes:

[0041] The simulation component 100 is composed of a tunnel model 101. The top of the tunnel model 101 is connected to the ventilation mechanism through a bracket 104. The bottom of the ventilation mechanism is fixed with a powder spraying mechanism.

[0042] The mounting assembly 200 is fixedly mounted to one side of the tunnel model 101. The mounting assembly 200 includes a mounting plate 201. A plurality of threaded holes 202 are formed in the middle of the mounting plate 201. Adjustment mechanisms are connected to the threaded holes 202.

[0043] A test assembly 300 , which is fixed to a side wall of the mounting assembly 200 through threaded holes 202 ;

[0044] The spray assembly 400 is rotatably connected to the top of the tunnel model 101 . The spray assembly 400 is correspondingly arranged above the ventilation mechanism. One end of the spray assembly 400 is fixedly connected to the rotating mechanism, and the rotating mechanism is movably installed inside the tunnel model 101 .

[0045] A plurality of evenly distributed angle irons 102 are fixedly installed on one side of the tunnel model 101. Each angle iron 102 is an L-shaped structure and is penetrated by a bolt 103. A tunneling head 112 is formed on one side of the tunnel model 101. The angle iron 102 is located on the inner wall of the tunnel model 101 on the side of the tunneling head 112. The edge of the tunnel model 101 is sealed and fitted with the mounting plate 201. The edge of the mounting plate 201 is fixedly connected with a surrounding edge 208 embedded in the inner wall of the tunnel model 101. The surrounding edge 208 extends to the inside of the angle iron 102, and the bolt 103 is threadedly connected to the inner side of the surrounding edge 208 for stable installation of the mounting plate 201. The top of the tunnel model 101 is connected to a plurality of evenly distributed The bracket 104 is fixedly connected, and the ventilation mechanism consists of a wind tube 106 and a clamp 105 assembly. Several clamps 105 are fixedly installed on the surface of the wind tube 106, and each clamp 105 is fixedly connected to the bottom end of the bracket 104. An air inlet and an air outlet are respectively provided at both ends of the wind tube 106. The air outlet is located on one side of the excavation head 112, and the distance between the air outlet and the excavation head 112 is 3m. Several evenly distributed dust concentration sensors 111 are fixedly installed on the inner wall of one side of the tunnel model 101, and adjacent dust concentration sensors 111 are arranged at intervals of 1m. The distance between the dust concentration sensor 111 and the excavation head 112 is 1m, and the height of the dust concentration sensor is 0.5m.

[0046] In this technical solution, during installation, the mounting plate 201 is attached to the edge of one side of the tunnel model 101, and the edge 208 is embedded in the tunnel model 101. At the same time, the edge 208 is moved to the inside of the angle iron 102, and the edge 208 is fixed to the inside of the angle iron 102 by bolts 103 to achieve stable fixation of the mounting plate 201. The bracket 104 is installed inside the tunnel model 101, and the wind tube 106 is fixed to the inside of the tunnel model 101 by the hoop 105. The air is passed through the wind tube 106. The airflow is transported to the interior of the tunnel model 101, and at the excavation head 112, the airflow is diffused into the interior of the tunnel model 101 and discharged, so that the airflow speed in the tunnel is adjusted between 0.15 and 0.25 m / s. At the same time, the actual environmental conditions in the tunnel model 101 are simulated to ensure the accuracy of subsequent test data. During the test, the tunnel model 101 is filled with dust, and the real-time concentration conditions at different positions inside the tunnel model 101 are monitored by the dust concentration sensor 111, which is conducive to improving the accuracy of the test data.

[0047] The powder spraying mechanism consists of a powder spraying pipe 107 and a nozzle 108. The powder spraying pipe 107 is fixedly connected to the end with a nozzle 108. The nozzle 108 is correspondingly arranged on one side of the wind tube 106, and the other end of the nozzle 108 passes through the tunnel model 101 and is connected to the storage box 109. The storage box 109 is fixedly installed to the outer wall of the tunnel model 101. The side wall of the storage box 109 is fixedly connected to the pump body 110, and the pump body 110 is connected to the powder spraying pipe 107.

[0048] In this technical solution, when air circulation is achieved in the wind duct 106, the pump body 110 is started to transport the dust in the storage box 109 to the inside of the nozzle 108 through the powder spraying pipe 107, and the dust is sprayed out through the nozzle 108. At the same time, the air flow is discharged from the wind duct 106 and contacts the dust, causing the dust to diffuse into the inside of the tunnel model 101 to realize the simulation of the dust content in the tunnel model 101.

[0049] The mounting plate 201 is provided with a plurality of evenly distributed threaded holes 202 inside, and a plurality of plugs 203 and an adjustment mechanism are respectively threadedly connected inside the threaded holes 202. The adjustment mechanism is composed of a joint 204, and the joint 204 and the test assembly 300 are interconnected and both are located inside the threaded hole 202; one end of the joint 204 is provided with a flange and is fitted with the inner wall of the mounting plate 201, and a threaded tube 205 is fixedly connected to one side of the joint 204 located on the flange surface, and a screw sleeve 207 is threadedly connected to the outer wall of the threaded tube 205, and the cross-section of the screw sleeve 207 is a U-shaped structure, and a plurality of evenly distributed baffles 206 are fixedly connected to the flange surface inside the threaded tube 205, and the baffles 206 are an arc-shaped structure and adjacent edges are staggered and fitted, and the baffle 206 is located inside the screw sleeve 207, and the inner wall of one end of the screw sleeve 207 is provided with an arc surface and contacts with a plurality of baffles 206.

[0050] In the present technical solution, a plurality of threaded holes 202 are arranged on the mounting plate 201 for the installation of the test component 300. The corresponding position of the experimental component installation is adjusted according to the actual drilling position, and the remaining threaded holes 202 are sealed by the plug 203. The grouped suction dust concentration meter 306 arranged opposite to the tunnel model 101 can adjust the suction negative pressure, which is used to simulate and monitor the suction effect under different negative pressure conditions, and the adjustment of the suction volume is achieved through the adjustment mechanism. During installation, the adjustment mechanism is installed according to the position of the test component 300, the joint 204 is threadedly connected to the inside of the mounting plate 201, and the position of the screw sleeve 207 is rotated as needed. When the screw sleeve 207 rotates, its inner wall contacts the baffle 206, so that the opening size of the baffle 206 is adjusted when the baffle 206 is retracted. When the airflow is discharged from the baffle 206 during suction, the baffle 206 is limited by the screw sleeve 207 so that the airflow is discharged from the opening, thereby realizing real-time simulation tests under drilling conditions of different diameters.

[0051] The test assembly 300 consists of a transparent tube 301 and an end head 302. The number of the transparent tubes 301 is several, one of which is threadedly connected to the inside of the threaded hole 202. The adjacent ends of the transparent tubes 301 are threadedly connected to each other. The transparent tubes 301 are made of acrylic material and have the same outer diameter. One of the transparent tubes 301 is threadedly connected to the end head 302. The surface of the end head 302 is provided with several evenly distributed fine holes 303. The inside of the end head 302 is fixedly connected to the sleeve 304 and the electric push rod 305 respectively. The electric push rod 305 is located inside the sleeve 304, the telescopic end of the electric push rod 305 is fixedly connected to the dust concentration meter 306, and one side of the dust concentration meter 306 is fixedly connected to the air guide cover 307, and a channel 310 for air suction and transportation is formed between the air guide cover 307 and the end head 302, and the other side of the dust concentration meter 306 is fixedly connected to the guide sleeve 308, and the guide sleeve 308 is movably connected to the surface of the sleeve 304, and the end of the guide sleeve 308 is fixedly connected to the sealing ring 309, and the sealing ring 309 is sealed and fits with the surface of the sleeve 304.

[0052] In this technical solution, drill rod simulation is achieved through multiple transparent tubes 301, and the length of the transparent tube 301 is adjusted according to the length of the drill rod to ensure the accuracy of the simulation test data. When the air inside the transparent tube 301 is sucked, the external airflow enters through the fine hole 303 at the end 302, and the larger impurities at the drill bit position are filtered out through the fine hole 303 to simulate the actual situation when drilling. The inhaled dust concentration is monitored by the dust concentration meter 306. When adjusting the suction air volume, the electric push rod 305 drives the air guide 307 on the dust concentration meter 306 to move. When the air guide 307 moves, the size of the channel 310 between the air guide 307 and the end 302 is adjusted, thereby achieving real-time adjustment. At the same time, the guide sleeve 308 drives the sealing ring 309 to move on the surface of the sleeve 304 to avoid dust entry and damage.

[0053] The spray assembly 400 is composed of a transverse tube 401 and a limiting sleeve 402. The transverse tube 401 is internally connected to the limiting sleeve 402 for rotation. The limiting sleeve 402 is fixedly installed on the top of the tunnel model 101. One side of the transverse tube 401 is fixedly connected to a plurality of evenly distributed nozzles 405. The middle of the other side of the transverse tube 401 is fixedly connected to a hose 403. The hose 403 passes through the top of the tunnel model 101 and is connected to a water pump 404. The water pump 404 is fixedly installed on the tunnel model 101. 1 top; the horizontal pipe 401 is correspondingly arranged on one side of the tunneling head 112, and the distance between the horizontal pipe 401 and the tunneling head 112 is 1m. A rotating mechanism is provided at one end of the horizontal pipe 401, and the rotating mechanism is composed of a rocker arm 406. One end of the horizontal pipe 401 is fixedly connected to the rocker arm 406, and the other end of the rocker arm 406 is rotatably connected to the telescopic end of the cylinder 407, and the cylinder 407 is tiltedly arranged inside the top of the tunnel model 101 and rotatably connected to the side wall of the tunnel model 101.

[0054] In this technical solution, the spray assembly 400 is arranged at a position 1m away from the top of the tunnel model 101 at a distance of 1m from the excavation head 112. Spraying is used to simulate different spray dust removal conditions in the tunnel model 101 and simulate different moisture contents of dust in the tunnel model 101. During the simulation, the water flow is transported to the inside of the horizontal pipe 401 by starting the water pump 404, and is sprayed out through the nozzle 405 to contact the dust-laden air. The rocker arm 406 is rotated by the extension and contraction of the cylinder 407. The rocker arm 406 rotates around one end of the horizontal pipe 401, so that the horizontal pipe 401 rotates stably inside the limit sleeve 402, thereby driving multiple nozzles 405 to adjust the angle, so that the angle of the water mist spray is appropriately adjusted to ensure that the moisture content of the dust-laden air in the tunnel model 101 is consistent with that during actual construction, thereby ensuring the accuracy of the simulation test.

[0055] The present invention is not limited to the above-described embodiments. Any changes in shape or structure fall within the scope of protection of the present invention. The scope of protection of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention. Such changes and modifications shall fall within the scope of protection of the present invention.

Claims

1. Excavation working face drilling extraction ventilation dust prevention simulation test device, characterized in that: The drilling and extraction ventilation and dust prevention simulation test device for the excavation working face includes: A simulation component (100), the simulation component (100) is composed of a tunnel model (101), the top of the tunnel model (101) is connected to a ventilation mechanism via a bracket (104), and a powder spraying mechanism is fixedly installed at the bottom of the ventilation mechanism; A mounting assembly (200), wherein the mounting assembly (200) is fixedly mounted on one side of the tunnel model (101), and the mounting assembly (200) comprises a mounting plate (201), wherein a plurality of threaded holes (202) are formed in the middle of the mounting plate (201), and an adjustment mechanism is connected inside the threaded holes (202); A test assembly (300), wherein the test assembly (300) is fixedly mounted to a side wall of the mounting assembly (200) via a threaded hole (202); A spray assembly (400) is rotatably connected to the top of the tunnel model (101). The spray assembly (400) is correspondingly arranged above the ventilation mechanism. One end of the spray assembly (400) is fixedly connected to the rotating mechanism, and the rotating mechanism is movably installed inside the tunnel model (101).

2. The excavation working face drilling extraction ventilation dust prevention simulation test device according to claim 1, characterized in that: A plurality of evenly distributed angle irons (102) are fixedly installed on one side of the tunnel model (101), each angle iron (102) is an L-shaped structure and is penetrated by a bolt (103), a tunneling head (112) is formed on one side of the tunnel model (101), the angle iron (102) is located on the inner wall of the tunnel model (101) on the side of the tunneling head (112), the edge of the tunnel model (101) is sealed and fitted with the mounting plate (201), and the edge of the mounting plate (201) is fixedly connected with a surrounding edge (208) embedded in the inner wall of the tunnel model (101), the surrounding edge (208) extends to the inside of the angle iron (102), and the bolt (103) is threadedly connected to the inside of the surrounding edge (208) for stable installation of the mounting plate (201).

3. The excavation working face drilling extraction ventilation dust prevention simulation test device according to claim 1, characterized in that: The top of the tunnel model (101) is fixedly connected to a plurality of evenly distributed brackets (104) by screws. The ventilation mechanism consists of a wind tube (106) and a clamp (105) assembly. A plurality of clamps (105) are fixedly installed on the surface of the wind tube (106). Each clamp (105) is fixedly connected to the bottom end of the bracket (104). An air inlet and an air outlet are respectively provided at both ends of the wind tube (106). The air outlet is located on one side of the tunneling head (112), and the distance between the air outlet and the tunneling head (112) is 3m. A plurality of evenly distributed dust concentration sensors (111) are fixedly installed on the inner wall of one side of the tunnel model (101). Adjacent dust concentration sensors (111) are arranged at intervals of 1m. The distance between the dust concentration sensor (111) and the tunneling head (112) is 1m, and the height of the dust concentration sensor is 0.5m.

4. The excavation working face drilling and extraction ventilation and dust prevention simulation test device according to claim 1, characterized in that: The powder spraying mechanism consists of a powder spraying pipe (107) and a nozzle (108). The powder spraying pipe (107) is fixedly connected to the nozzle (108) at the end. The nozzle (108) is correspondingly arranged on one side of the air duct (106). The other end of the nozzle (108) passes through the tunnel model (101) and is connected to a storage box (109). The storage box (109) is fixedly installed on the outer wall of the tunnel model (101). The side wall of the storage box (109) is fixedly connected to a pump body (110), and the pump body (110) is communicated with the powder spraying pipe (107).

5. The excavation working face drilling and extraction ventilation and dust prevention simulation test device according to claim 1, characterized in that: The mounting plate (201) is provided with a plurality of threaded holes (202) evenly distributed therein, and the threaded holes (202) are respectively threadedly connected with a plurality of plugs (203) and an adjustment mechanism, the adjustment mechanism being composed of a joint (204), and the joint (204) and the test assembly (300) are connected to each other and are both located inside the threaded hole (202).

6. The excavation working face drilling and extraction ventilation and dust prevention simulation test device according to claim 5, characterized in that: One end of the joint (204) is provided with a flange and is fitted and connected to the inner wall of the mounting plate (201); a threaded pipe (205) is fixedly connected to one side of the joint (204) located on the flange surface; a screw sleeve (207) is threadedly connected to the outer wall of the threaded pipe (205); and the cross section of the screw sleeve (207) is a U-shaped structure; a plurality of evenly distributed baffles (206) are fixedly connected to the flange surface located inside the threaded pipe (205); the baffles (206) are an arc-shaped structure with adjacent edges staggered and fitted; the baffles (206) are located inside the screw sleeve (207), and an inner wall of one end of the screw sleeve (207) is provided with an arc surface and contacts the plurality of baffles (206).

7. The excavation working face drilling and extraction ventilation and dust prevention simulation test device according to claim 1, characterized in that: The test assembly (300) consists of a transparent tube (301) and an end cap (302). The number of the transparent tubes (301) is several, one of which is threadedly connected to the inside of the threaded hole (202), and adjacent ends of the transparent tubes (301) are threadedly connected to each other. The transparent tubes (301) are made of acrylic material and have the same outer diameter, and one of the transparent tubes (301) is threadedly connected to the end cap (302).

8. The excavation working face drilling and extraction ventilation and dust prevention simulation test device according to claim 7, characterized in that: The surface of the end head (302) is provided with a plurality of evenly distributed fine holes (303). The interior of the end head (302) is fixedly connected to the sleeve (304) and the electric push rod (305), respectively. The electric push rod (305) is located inside the sleeve (304). The telescopic end of the electric push rod (305) is fixedly connected to the dust concentration meter (306), and one side of the dust concentration meter (306) is fixedly connected to the air guide cover (307). A channel (310) for air suction and transportation is formed between the air guide cover (307) and the end head (302). The other side of the dust concentration meter (306) is fixedly connected to the guide sleeve (308). The guide sleeve (308) is movably sleeved on the surface of the sleeve (304). The end of the guide sleeve (308) is fixedly connected to the sealing ring (309), and the sealing ring (309) is sealed and fitted on the surface of the sleeve (304).

9. The excavation working face drilling and extraction ventilation and dust prevention simulation test device according to claim 1, characterized in that: The spray assembly (400) is composed of a transverse tube (401) and a limiting sleeve (402), wherein the transverse tube (401) is internally rotatably connected to the limiting sleeve (402), and the limiting sleeve (402) is fixedly mounted on the top of the tunnel model (101). A plurality of evenly distributed nozzles (405) are fixedly connected to one side of the transverse tube (401), and the middle portion of the other side of the transverse tube (401) is fixedly connected to a hose (403), which passes through the top of the tunnel model (101) and is connected to a water pump (404), and the water pump (404) is fixedly mounted on the top of the tunnel model (101).

10. The excavation working face drilling and extraction ventilation and dust prevention simulation test device according to claim 9, characterized in that: The transverse tube (401) is correspondingly arranged on one side of the tunneling head (112), and the distance between the transverse tube (401) and the tunneling head (112) is 1m. A rotating mechanism is provided at one end of the transverse tube (401), and the rotating mechanism is composed of a rocker (406). One end of the transverse tube (401) is fixedly connected to the rocker (406), and the other end of the rocker (406) is rotatably connected to the telescopic end of the cylinder (407), and the cylinder (407) is tiltedly arranged inside the top of the tunnel model (101) and rotatably connected to the side wall of the tunnel model (101).

Images