Intelligent dust removal device for coal mine driving working face

Abstract

The invention relates to the field of coal mining, in particular to a coal mine driving face intelligent dust removal device which comprises an air supply system and a dust removal system. The air supply system comprises an intelligent wall-attached air cylinder, a first air supply air cylinder, an air cylinder storage unit, a second air supply air cylinder and a PLC control box 11 provided with a PLC system, the air cylinder storage unit is provided with a connecting cylinder with two open ends, one end of the first air supply air cylinder is connected with the intelligent wall-attached air cylinder, and the other end of the first air supply air cylinder is connected with one end of the connecting cylinder of the air cylinder storage unit. The distance between the intelligent wall-attached air cylinder and the air cylinder storage device is not changed, a compression air cylinder penetrating through the connecting column is arranged in the air cylinder storage device, one end of the compression air cylinder is connected with the other end of a connecting cylinder 17 of the air cylinder storage device 9, and the other end of the compression air cylinder is connected with a second air supply air cylinder. The second air supply air duct is located on the rear side of the air duct storage device and hung on the top of the roadway. The relative positions of the air outlet of the wall-attached air duct and the air suction opening of the dust removal air duct can be kept unchanged all the time.

Description

Technical Field

[0001] The invention relates to the field of coal mining, and in particular to the field of dust removal in the coal mining process. Background Art

[0002] A large amount of coal dust is generated during the coal mining process. The presence of coal dust not only causes damage to the workers but also may cause gas explosions. Therefore, dust removal is required in time during the mining process of the roadheader. In the prior art, the coal dust is generally removed online by introducing fresh air and absorbing the gas containing coal dust.

[0003] The patent with publication number CN116201591A discloses a dust removal system for an excavation working face, comprising: a tunneling machine, which is located in a tunnel; a baffle plate, which is vertically and detachably arranged between the driver's cab and the cutting head of the tunneling machine to divide the tunnel into a working area and a smoke and dust area, and is movably sleeved on a rocker arm through a movable hole thereon; a suction fan, which is located in the working area and is movable through a slider in a slideway located at the top of the tunnel and extending along the length of the tunnel, the air inlet of the suction fan is connected to an air inlet pipe connected to the outside of the tunnel, the air outlet of the suction fan is connected to a positive pressure air duct, and the air outlet end of the positive pressure air duct extends to the smoke and dust area through a first air hole on the baffle plate; a dry filter, which is located in the working area, one end of the dry filter is connected to an exhaust fan, and the other end is connected to a negative pressure air duct, and the air inlet end of the negative pressure air duct extends to the smoke and dust area through a second air hole on the baffle plate.

[0004] The patent with publication number CN216406831U discloses a dust removal and purification device for an excavation working face, which belongs to the field of coal mine engineering technology, and includes a comprehensive excavation machine, a negative pressure draft device, a negative compression air duct 16, a dust removal fan, an air curtain pipe, a traveling vehicle and a connecting mechanism. The comprehensive excavation machine is connected to the traveling vehicle through the connecting mechanism, and the comprehensive excavation machine and the traveling vehicle are synchronously moved by the connecting mechanism. An air curtain pipe is installed above the comprehensive excavation machine, and the air curtain pipe is installed above the traveling vehicle. The negative pressure draft device is installed on the side of the comprehensive excavation machine, and the air outlet of the negative pressure draft device is directly opposite to one end of the negative compression air duct 16. A dust removal fan is installed at the other end of the negative compression air duct 16, and the air suction port of the negative pressure draft device is aimed at the comprehensive excavation machine. The negative compression air duct 16 is installed at the end of the dust removal fan, and the dust removal fan is installed on the upper side of the traveling vehicle.

[0005] The matching of ventilation and dust removal parameters is one of the main factors affecting the dust removal effect of the excavation face. The matching of dust removal air volume and air supply air volume, and the relative position of dust removal port and air supply port directly affect the dust removal effect, and also affect the ventilation safety such as gas dilution and personnel breathing. At present, domestic dust collectors are all operated as a single machine, and are not linked with ventilation. The matching relationship between ventilation and dust removal is constantly changing, which is the main reason why the dust removal effect of many coal mines cannot be sustained for a long time.

[0006] Therefore, an intelligent dust removal device is developed, which takes gas and dust concentration as the main parameters, and conducts intelligent and coordinated control of ventilation and dust removal parameters to maintain the optimal ventilation and dust removal parameters and achieve the best dust removal effect in the tunnel. Summary of the invention

[0007] The technical problem to be solved by the present invention is: how to provide an intelligent dust removal device for a coal mine excavation working face in which the dust removal air volume and the air supply air volume are matched and the relative positions of the dust removal port and the air supply port remain unchanged.

[0008] The technical solution adopted by the present invention is: an intelligent dust removal device for a coal mine excavation working face, including an air supply system and a dust removal system; the air supply system includes an intelligent wall-attached air duct 4, a first air supply air duct 5, an air duct storage 9, a second air supply air duct 13 and a PLC control box 11 installed with a PLC system, which are arranged in sequence; a connecting tube 17 with two ends opening is provided on the air duct storage 9; one end of the first air supply air duct 5 is connected to the intelligent wall-attached air duct 4 and the other end is connected to one end of the connecting tube 17 of the air duct storage 9; the distance between the intelligent wall-attached air duct 4 and the air duct storage 9 remains unchanged; the air duct storage 9 has a compression air duct 16 passing through a connecting column 18; one end of the compression air duct 16 is connected to the connection of the air duct storage 9 The other end of the cylinder 17 is connected to the second air supply duct 13, and the second air supply duct 13 is located at the rear side of the duct storage 9 and is suspended at the top of the tunnel. The dust removal system includes a dust removal duct 3, a dust collector 7, a variable frequency fan 8, and a frequency converter 10. The variable frequency fan 8 provides power for the dust collector 7, and the frequency converter 10 is connected to the variable frequency fan 8. The air suction end of the dust removal duct 3 is fixed on the tunneling machine, and the air outlet end of the dust removal duct 3 is connected to the dust collector 7; the dust collector 7 and the duct storage 9 are fixed on equipment that moves with the tunneling machine, and the intelligent wall-attached duct 4 is fixed on the dust removal duct 3 on the tunneling machine side, and the distance between the air suction port of the intelligent wall-attached duct 4 and the dust removal duct 3 remains unchanged.

[0009] The air supply system further includes a rectangular air supply duct 6 , which is fixed on the top of the dust collector 7 , and the second air supply cylinder 13 passes through the rectangular air supply duct 6 .

[0010] The intelligent wall-attached wind duct 4 comprises a cylindrical wall-attached wind duct body 4.1, one end of the wall-attached wind duct body 4.1 is a wall-attached wind duct air inlet 4.5, the other end of the wall-attached wind duct body 4.1 is a wall-attached wind duct main air outlet, the wall-attached wind duct body 4.1 is provided with a wall-attached wind duct radial sub-air outlet 4.6 on the circumference of the wall-attached wind duct body 4.1, a damper 4.3 is installed at the wall-attached wind duct main air outlet, an electric actuator 4.2 for controlling the opening of the damper 4.3 is installed on the side of the wall-attached wind duct body 4.1, an air volume sensor 1 is installed at the wall-attached wind duct air inlet 4.5, and an air volume sensor 1 is installed at the wall-attached wind duct main air outlet.

[0011] The air intake end of the dust removal air duct 3 is provided with an air volume sensor 1 and a gas concentration output sensor 2, and the driver's position of the tunnel boring machine is provided with a dust concentration sensor 12. The gas concentration output sensor 2, the frequency converter 10, the electric actuator 4.2 and all the air volume sensors 1 are connected to the PLC in the PLC control box 11.

[0012] When the gas concentration sensor 2 detects that the gas concentration is greater than or equal to the gas concentration setting value, the air damper 4.3 is closed by the electric actuator 4.2; when the gas concentration sensor 2 detects that the gas concentration is less than the set gas concentration, if the dust concentration sensor 12 detects that the dust concentration is greater than or equal to the dust setting value, the frequency of the variable frequency fan 8 is increased by the frequency converter 10. If the frequency of the variable frequency fan 8 is increased to the maximum setting frequency value by the frequency converter 10, the dust concentration sensor 12 detects that the dust concentration is still greater than the dust setting value, then the opening of the air damper 4.3 is increased. If the dust concentration sensor 12 detects that the dust concentration is less than the setting value, the frequency of the variable frequency fan 8 is reduced by the frequency converter 10 until the frequency converter 10 reduces the frequency of the variable frequency fan 8 to the rated setting frequency value, so that the frequency of the variable frequency fan 8 is maintained at the rated setting frequency value for stable operation.

[0013] The beneficial effects of the present invention are as follows: an air volume sensor and a gas concentration sensor are arranged at the air inlet of the dust removal duct to measure the dust removal air volume and gas concentration in real time; an air volume sensor is arranged at the air outlet of the wall duct to measure the head-on air volume in real time; an air volume sensor is arranged at the air inlet of the wall duct to measure the total air volume in real time, and the difference between the two is the radial air volume of the wall duct. This provides an accurate control basis for accurately adjusting ventilation and dust removal parameters.

[0014] The air supply duct and the dust removal duct are both arranged on the excavation equipment. The air outlet of the wall duct and the air suction port of the dust removal duct move with the excavation equipment. This ensures that the relative position of the air outlet of the wall duct and the air suction port of the dust removal duct remains unchanged, and the distance between the wall duct and the head can always be maintained at 5 (A: tunnel cross-sectional area), to ensure the best dust removal effect in the tunnel, provide the best relative position for ventilation and dust removal.

[0015] The present invention automatically adjusts the radial-axial wind ratio of the wall-attached wind tube and the operating air volume of the dust collector according to the gas concentration and the gas concentration value in the tunnel, thereby ensuring the best ventilation and dust removal air volume matching and ensuring the best dust removal effect in the tunnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the structure of the intelligent wall-attached air duct of the present invention; Figure 3 It is a partial structural schematic diagram of the present invention; Figure 4 It is a control flow diagram of the present invention; Figure 5 This is a schematic diagram of the structure of the wind tube storage device of the present invention; Among them, 1-air volume sensor, 2-gas concentration sensor, 3-dust removal duct, 4-intelligent wall-attached duct, 5-air supply duct, 6-rectangular air supply duct, 7-dust collector, 8-frequency conversion fan, 9-duct storage, 10-frequency converter, 11-PLC control box, 12-dust concentration sensor, 13-air supply duct at the rear of the tunnel, 14-hanging rope, 15-iron wire, 16-compression duct, 17-connecting tube, 18-connecting column, 4.1-wall-attached duct body, 4.2-electric actuator, 4.3-damper, 4.4-wall-attached duct air outlet, 4.5-wall-attached duct air inlet, 4.6-wall-attached duct radial air outlet. DETAILED DESCRIPTION

[0017] like Figure 1-5 As shown, an intelligent dust removal device for a coal mine excavation working face includes an air supply system and a dust removal system; the air supply system includes an intelligent wall-attached air duct 4, a first air supply air duct 5, an air duct storage 9, a second air supply air duct 13 and a PLC control box 11 installed with a PLC system, which are arranged in sequence; a connecting tube 17 with two ends opened is provided on the air duct storage 9; one end of the first air supply air duct 5 is connected to the intelligent wall-attached air duct 4 and the other end is connected to one end of the connecting tube 17 of the air duct storage 9; the intelligent wall-attached air duct 4 and the air duct storage 9 are connected to the intelligent wall-attached air duct 4 and the second air supply air duct 13. The distance between the devices 9 remains unchanged, and the air cylinder storage 9 has a compression air cylinder 16 passed through the connecting column 18, one end of the compression air cylinder 16 is connected to the other end of the connecting cylinder 17 of the air cylinder storage 9, and the other end is connected to the second air supply air cylinder 13, the second air supply air cylinder 13 is located at the rear side of the air cylinder storage 9 and is hung on the top of the alley, the air supply system also includes a rectangular air supply duct 6, the rectangular air supply duct 6 is fixed on the top of the dust collector 7, and the second air supply duct 13 passes through the rectangular air supply duct 6.

[0018] The dust removal system includes a dust removal duct 3, a dust collector 7, a variable frequency fan 8, and a frequency converter 10. The variable frequency fan 8 provides power for the dust collector 7. The frequency converter 10 is connected to the variable frequency fan 8. The air suction end of the dust removal duct 3 is fixed on the tunnel boring machine, and the air outlet end of the dust removal duct 3 is connected to the dust collector 7. The dust collector 7 and the duct storage 9 are fixed on equipment that moves with the tunnel boring machine. The intelligent wall-attached duct 4 is fixed on the dust removal duct 3 on the tunnel boring machine side, and the distance between the air suction ports of the intelligent wall-attached duct 4 and the dust removal duct 3 remains unchanged.

[0019] When the tunnel boring machine moves forward, the compressed air cylinder 16 in the air cylinder storage 9 will automatically extend, and the extended compressed air cylinder will be manually hung on the tunnel roof and arranged on the wire 15 in advance through the hanging rope 14.

[0020] The intelligent wall-attached wind duct 4 comprises a cylindrical wall-attached wind duct body 4.1, one end of the wall-attached wind duct body 4.1 is a wall-attached wind duct air inlet 4.5, the other end of the wall-attached wind duct body 4.1 is a wall-attached wind duct main air outlet, the wall-attached wind duct body 4.1 is provided with a wall-attached wind duct radial sub-air outlet 4.6 on the circumference of the wall-attached wind duct body 4.1, a damper 4.3 is installed at the wall-attached wind duct main air outlet, an electric actuator 4.2 for controlling the opening of the damper 4.3 is installed on the side of the wall-attached wind duct body 4.1, an air volume sensor 1 is installed at the wall-attached wind duct air inlet 4.5, and an air volume sensor 1 is installed at the wall-attached wind duct main air outlet.

[0021] Radial air distribution volume Q of radial air distribution outlet 4.6 of wall-mounted air duct 压-径 The remaining airflow flows out from the main air outlet of the wall-mounted wind tube and reaches the head as the axial air volume (Q 压-抽 ). An air volume sensor 1 is arranged at the main air outlet of the wall-mounted wind duct to measure the head-on air volume Q 压-抽 ; Air volume sensor 1 is arranged at the air inlet of the wall-mounted wind duct to measure the total air supply volume Q 压- ; Subtracting the two can get the radial air volume Q of the wall-attached duct 压-- Q 压-抽 =Q 压-径 ; Send instructions to the electric actuator 4.2 through the PLC control box 11 to automatically adjust the opening of the damper 4.3 and automatically adjust the radial-axial air distribution ratio.

[0022] The air intake end of the dust removal air duct 3 is provided with an air volume sensor 1 and a gas concentration output sensor 2, and the driver's position of the tunnel boring machine is provided with a dust concentration sensor 12. The gas concentration output sensor 2, the frequency converter 10, the electric actuator 4.2 and all the air volume sensors 1 are connected to the PLC in the PLC control box 11.

[0023] When the gas concentration sensor 2 detects that the gas concentration is greater than or equal to the set gas concentration value (such as volume concentration 0.4%), the electric actuator 4.2 controls the air door 4.3 to close (the air door opening is 0); when the gas concentration sensor 2 detects that the gas concentration is less than the set gas concentration (such as volume concentration 0.4%), if the dust concentration sensor 12 detects that the dust concentration is greater than or equal to the dust setting value (such as 20mg / m 3), the frequency of the variable frequency fan 8 is increased through the frequency converter 10. If the frequency of the variable frequency fan 8 is increased to the maximum set frequency value (such as 50HZ) through the frequency converter 10, and the dust concentration sensor 12 detects that the dust concentration is still greater than the dust set value, the opening of the air door 4.3 is increased. If the dust concentration sensor 12 detects that the dust concentration is less than the dust set value, the frequency of the variable frequency fan 8 is reduced through the frequency converter 10 until the frequency converter 10 reduces the frequency of the variable frequency fan 8 to the rated set frequency value (such as 30HZ), so that the frequency of the variable frequency fan 8 is maintained at the rated set frequency value and operates stably.

[0024] The relative position of the air inlet of the dust removal air duct 3 and the intelligent wall-attached air duct 4 remains unchanged. 压 And wall-mounted air duct installation position 5 Always remain the same.

Claims

1. An intelligent dust removal device for coal mine excavation working face, Features: The invention comprises an air supply system and a dust removal system; the air supply system comprises an intelligent wall-attached air duct (4), a first air supply air duct (5), an air duct storage (9), a second air supply air duct (13) and a PLC control box (11) installed with a PLC system, which are arranged in sequence; the air duct storage (9) is provided with a connecting tube (17) with two ends opened; one end of the first air supply air duct (5) is connected to the intelligent wall-attached air duct (4) and the other end is connected to one end of the connecting tube (17) of the air duct storage (9); the distance between the intelligent wall-attached air duct (4) and the air duct storage (9) remains unchanged; the air duct storage (9) is provided with a compression air duct (16) which is passed through a connecting column (18); one end of the compression air duct (16) is connected to the other end of the connecting tube (17) of the air duct storage (9) and the other end is connected to the second air supply air duct (13); The second air supply duct (13) is located at the rear side of the duct storage (9) and is suspended at the top of the tunnel. The dust removal system comprises a dust removal duct (3), a dust collector (7), a variable frequency fan (8), and a frequency converter (10). The variable frequency fan (8) provides power for the dust collector (7). The frequency converter (10) is connected to the variable frequency fan (8). The air suction end of the dust removal duct (3) is fixed on the tunneling machine, and the air outlet end of the dust removal duct (3) is connected to the dust collector (7). The dust collector (7) and the duct storage (9) are fixed on equipment that moves with the tunneling machine. The intelligent wall-attached duct (4) is fixed on the dust removal duct (3) on the tunneling machine side. The distance between the air suction ports of the intelligent wall-attached duct (4) and the dust removal duct (3) remains unchanged.

2. According to claim 1, an intelligent dust removal device for coal mine excavation working face, Features: The air supply system further comprises a rectangular air supply duct (6), wherein the rectangular air supply duct (6) is fixed to the top of the dust collector (7), and the second air supply cylinder (13) passes through the rectangular air supply duct (6).

3. According to claim 1, an intelligent dust removal device for coal mine excavation working face, Features: The intelligent wall-attached wind duct (4) comprises a cylindrical wall-attached wind duct body (4.1), one end of the wall-attached wind duct body (4.1) being a wall-attached wind duct air inlet (4.5), the other end of the wall-attached wind duct body (4.1) being a wall-attached wind duct main air outlet, a wall-attached wind duct radial air outlet (4.6) being provided on the circumference of the wall-attached wind duct body (4.1), a damper (4.3) being installed at the wall-attached wind duct main air outlet, an electric actuator (4.2) for controlling the opening of the damper (4.3) being installed at the side of the wall-attached wind duct body (4.1), an air volume sensor (1) being installed at the wall-attached wind duct air inlet (4.5), and an air volume sensor (1) being installed at the wall-attached wind duct main air outlet.

4. The intelligent dust removal device for coal mine excavation working face according to claim 3, Features: An air volume sensor (1) and a gas concentration output sensor (2) are provided at the air intake end of the dust removal air cylinder (3); a dust concentration sensor (12) is provided at the driver's position of the tunnel boring machine; the gas concentration output sensor (2), the frequency converter (10), the electric actuator (4.2) and all the air volume sensors (1) are connected to a PLC in a PLC control box (11).

5. The intelligent dust removal device for coal mine excavation working face according to claim 4, Features: When the gas concentration output sensor (2) detects that the gas concentration is greater than or equal to the gas concentration setting value, the air door (4.3) is controlled to be closed through the electric actuator (4.2); when the gas concentration output sensor (2) detects that the gas concentration is less than the set gas concentration, if the dust concentration sensor (12) detects that the dust concentration is greater than or equal to the dust setting value, the frequency of the variable frequency fan (8) is increased through the frequency converter (10); if the frequency of the variable frequency fan (8) is increased to the maximum setting frequency value through the frequency converter (10), the dust concentration sensor (12) detects that the dust concentration is still greater than the dust setting value, the opening of the air door (4.3) is increased; if the dust concentration sensor (12) detects that the dust concentration is less than the setting value, the frequency of the variable frequency fan (8) is reduced through the frequency converter (10) until the frequency converter (10) reduces the frequency of the variable frequency fan (8) to the rated setting frequency value, so that the frequency of the variable frequency fan (8) is maintained at the rated setting frequency value for stable operation.

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