A two-stage foam dust removal system for mining and its control method

Abstract

The invention discloses a two-stage foam dust removal system for mining, comprising a cyclone dust removal component (11), a dust removal chamber (12), a foam breaking component (13), and a negative pressure component (14) connected in sequence from left to right; a foaming component for generating foam is provided above the dust removal chamber (12), and the output end of the foaming component is connected to a nozzle (51) of a conical structure located in the dust removal chamber (12) through a conveying pipe group (25); a foaming net group (4) for secondary foaming is rotatably installed in the conveying pipe group (25), and the nozzle (51) is arranged to rotate downward by 0-60°, and is angularly positioned by a limit assembly thereon. The two-stage foam dust removal system for mining and the control method thereof not only effectively improve the foam utilization rate and dust coverage rate, greatly reduce energy consumption, solve the problem of dust-containing foam pollution, but also ensure that the ejected foam fully collides with the dust-containing airflow, thereby improving the dust capture rate.

Description

Technical Field

[0001] The invention relates to the technical field of foam dust reduction, and in particular to a two-stage foam dust removal system for mining and a control method thereof. Background Art

[0002] Coal is the main energy source in my country, and the demand is still growing every year. Underground coal mines account for more than 90% of the total mining volume. Under large-scale mining, a large amount of dust will be generated in coal mining faces and other places. At present, the degree of automation in coal mining is constantly improving, and the surge in dust production has led to a continuous increase in the probability of dust explosions, which greatly threatens the health and safety of underground workers.

[0003] In order to prevent and control mine dust, most technologies used at home and abroad are coal seam water injection, spray dust reduction, ventilation dust removal, dust collector dust removal, etc. These technologies have played an important role in mine dust prevention, but they also have various disadvantages, such as coal seam water injection is easily restricted by coal seam occurrence conditions, and the water injection system and sealing process are complicated, water spray has low dust reduction efficiency for respirable dust, large water consumption and nozzles are easy to clog;

[0004] As an emerging dust removal technology, foam dust removal utilizes the good wetting and covering effects of foam to demonstrate superior performance in dust suppression. However, the existing foam dust removal technology simply mixes foam with dust-laden airflow. The single foaming results in low foam utilization efficiency and inadequate dust foam treatment. In addition, when in use, the foam nozzle cannot be adjusted according to the air volume of the dust-laden airflow, resulting in uneven foam mixing. Summary of the invention

[0005] The object of the present invention is to provide a two-stage foam dust removal system for mining and a control method thereof, which not only effectively improves the foam utilization rate and dust coverage rate and greatly reduces energy consumption, but also ensures that the sprayed foam fully collides with the dust-laden airflow, so that the foam and dust are mixed more evenly and the dust capture rate is improved.

[0006] To achieve the above purpose, the present invention is a two-stage foam dust removal system for mining, comprising a cyclone dust removal component, a dust removal chamber, a foam breaking component, and a negative pressure component connected in sequence from left to right;

[0007] A foaming component for generating foam is provided above the dust removal chamber, and the output end of the foaming component is connected to a nozzle of a conical structure located in the dust removal chamber through a delivery pipe group;

[0008] A foaming net group for secondary foaming is rotatably installed in the conveying pipe group, and the nozzle is arranged to rotate downward by 0-60 degrees, and the angle is positioned by the limiting component thereon.

[0009] Furthermore, the foaming net group includes a rotatably mounted metal foaming net and blades that are evenly arranged around the metal foaming net and are arranged at the same inclination angle;

[0010] The metal foam net is composed of a plurality of metal wires that cross each other horizontally and vertically to form a tic-tac-toe structure, and each metal wire is an S-shaped structure.

[0011] Furthermore, the delivery pipe group includes a first delivery pipe having one end connected to the output end of the foaming component and a second delivery pipe having one end connected to the nozzle;

[0012] The other end of the second delivery pipe is a T-shaped structure, and is close to the other end of the first delivery pipe with external threads and there is a gap between them;

[0013] A sealing ring is slidably provided on the second delivery pipe, which is limited by the T-shaped structure of the second delivery pipe and has threads that match the external threads on the first delivery pipe. The foaming net group is located at the T-shaped structure port of the second delivery pipe.

[0014] Furthermore, the nozzle is rotatably connected to the end of the delivery pipe group through a hinge shaft;

[0015] The limiting assembly includes a fixedly mounted positioning plate;

[0016] The nozzle is provided with a positioning rod with a positioning hole, and the positioning plate is provided with a plurality of positioning blocks which are elastically arranged and matched with the positioning holes, wherein one of the positioning blocks is embedded in the positioning hole when the nozzle rotates;

[0017] The hinge shaft is provided with a torsion spring for driving the nozzle to return to the 0° state.

[0018] Furthermore, the positioning plate is provided with a plurality of evenly arranged blind holes in an arc shape, and the positioning block is movably arranged in the blind hole, and one end of the positioning block is in contact with the spring in a compressed state;

[0019] The blind hole port is provided with a retaining ring for limiting the positioning block.

[0020] Furthermore, the side of the positioning block close to the positioning hole is a quadrangular pyramid structure;

[0021] The nozzle is internally provided with spirally arranged sawtooth blocks.

[0022] Furthermore, the foaming component includes a foaming chamber and a foaming agent chamber located in the foaming chamber; the foaming chamber is interconnected with the air pipe and the high-pressure water pipe;

[0023] The negative pressure component comprises a support cylinder installed on the right side of the bubble breaking component and a fan arranged to rotate in the support cylinder.

[0024] Furthermore, the lower end of the cyclone dust removal component connected to the dust removal chamber is provided with a dust collection chamber, and the bottom end of the bubble breaking component is provided with a dust outlet;

[0025] A sliding plate is arranged at the bottom end of the inner wall of the dust removal chamber, which is located between the dust collection chamber and the dust outlet and is arranged higher on the left and lower on the right.

[0026] Furthermore, it also includes a linkage control component, which includes a controller, a first solenoid valve installed on the foaming agent chamber for adjusting the amount of foaming agent, a second solenoid valve installed on the air duct and the high-pressure water pipe respectively for controlling the flow rate of the corresponding medium, a dust sensor installed at the entrance end of the cyclone dust removal component for measuring the dust concentration, and a foam sensor located at the top of the dust removal chamber and on the left side of the nozzle for sensing the foam height;

[0027] The controller is respectively connected with the first solenoid valve, the second solenoid valve, the dust sensor and the foam sensor, and controls their corresponding actions.

[0028] A control method for a two-stage foam dust removal system for mining, specifically comprising the following steps:

[0029] a. The fan starts, generating negative pressure so that the dust-laden airflow enters the cyclone dust removal assembly;

[0030] The cyclone dust removal component rotates and stirs the dust-laden airflow, causing large dust particles to settle into the dust collection chamber at the bottom, while the scattered large dust particles settle onto the sliding plate and slide down to the dust outlet, completing the primary dust removal of the dust-laden airflow;

[0031] b. Water enters the foaming chamber from the high-pressure water pipe, air enters the foaming chamber from the air pipe, and the foaming agent in the foaming agent chamber enters the foaming chamber. The three are mixed with each other to produce foam, completing the primary foaming; the foam flows through the metal foaming net in the conveying pipe group, and multiple blades around the metal foaming net rotate under the action of the airflow, driving the metal foaming net to rotate, and further generate floc foam through relative movement, completing the secondary foaming;

[0032] c. The dust sensor on the left side of the cyclone dust removal component senses the dust concentration in the dust-laden airflow and transmits the signal to the controller; the controller controls the opening and closing of the second solenoid valve on the high-pressure water pipe to change the high-pressure water pressure, and controls the second solenoid valve on the air pipe to change the volume of air entering the foaming chamber, and controls the opening and closing degree of the first solenoid valve at the bottom of the foaming agent chamber to adjust the amount of foaming agent, thereby generating controllable quantitative foam;

[0033] The secondary foaming gel foam is sprayed out from the nozzle of the cone structure. The foam sensor at the top of the dust removal chamber senses the distance between the generated gel foam and the top of the dust removal chamber, and feeds back to the controller to transmit information to ensure the volume of foam generated.

[0034] The dust-laden airflow after the first-stage dust removal acts on the nozzle, causing the nozzle to automatically adjust the spray angle according to the change in air volume. When the dust-laden air volume is large, the downward deflection angle of the nozzle increases. When the air volume decreases, the nozzle angle gradually returns to a horizontal state.

[0035] The dust-laden airflow and the floc foam are mixed with each other to perform foam dust reduction. The floc foam wrapped with dust is broken by the floc breaking component. The broken dust-laden foam settles to the sewage outlet, completing the secondary dust removal, and the clean airflow is discharged from the fan.

[0036] d. Finally, turn off the fan and clean the dust in the dust collection chamber and the outlet.

[0037] Compared with the prior art, the two-stage foam dust removal system for mining is provided with a cyclone dust removal component, a dust removal chamber, a foam breaking component, and a negative pressure component from left to right, and a foaming net group for secondary foaming is rotatably installed in the conveying pipe group. Therefore, when water, air, and foaming agent enter the foaming chamber and mix to generate foam, primary foaming is completed, and the foam flows through the foaming net group in the conveying pipe group to generate foam cluster foam, and secondary foaming is completed; after the fan is started, the dust-laden airflow passes through the cyclone dust removal component to make large particles of dust settle to the dirty dust collection chamber at the bottom, and primary dust removal of the dust-laden airflow is completed, and then the foam dust is reduced by mixing with the foam cluster foam, and secondary dust removal is completed. Therefore, the double foaming and two-stage dust removal not only effectively improve the foam utilization rate and dust coverage rate, greatly reduce energy consumption, but also make the foam dust removal effect better;

[0038] Since the metal foaming net is composed of a plurality of metal wires that cross each other in a tic-tac-toe structure, each metal wire is an S-shaped structure, and a plurality of blades are arranged on the peripheral side, when the foam flows through the metal foaming net in the conveying pipe group, the plurality of blades on the peripheral side of the metal foaming net rotate under the action of the airflow, driving the metal foaming net to rotate, and further generating agglomerate foam through relative movement, effectively increasing the foaming rate, and preventing the loss of foam through the conveying pipe group;

[0039] Since the delivery pipe group includes a first delivery pipe and a second delivery pipe with a gap therebetween, the sealing ring is moved so that one end thereof presses against the T-shaped structure of the second delivery pipe for sealing and limiting, and the other end thereof is threadedly installed on the first delivery pipe, thereby achieving a sealed connection between the first delivery pipe and the second delivery pipe, and facilitating rapid disassembly and assembly of the foaming net group;

[0040] Since the nozzle is arranged to rotate downward by 0-60° and is positioned at an angle through the limit assembly on it, the nozzle automatically adjusts the spray angle according to the change in air volume. When the dust-laden air volume is large, the downward deflection angle of the nozzle increases. When the air volume decreases, the nozzle angle gradually returns to a horizontal state, thereby ensuring that the sprayed foam fully collides with the dust-laden airflow, making the foam and dust mixed more evenly and improving the dust capture rate. In addition, a spirally arranged sawtooth block is provided inside the nozzle, so that the foam passes through the spirally arranged sawtooth block, effectively reducing the foam loss;

[0041] Due to the provision of a linkage control component, the linkage control component includes a controller, a first solenoid valve for adjusting the foaming dosage, a second solenoid valve for controlling the flow rate of air and high-pressure water, a dust sensor for measuring dust concentration, and a foam sensor for sensing foam height. Therefore, the actions of corresponding components are controlled by the controller to ensure that secondary foaming and secondary dust removal are carried out in sequence, which facilitates the control of foaming and dust removal, greatly reduces the energy consumption of foam dust removal, and improves the foam utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is the overall front view of the present invention;

[0043] Figure 2 is a front view of the delivery pipe assembly of the present invention;

[0044] Figure 3 is a top view of the foaming net assembly of the present invention;

[0045] Figure 4 This is a front view of the installation position of the spray group of the present invention;

[0046] Figure 5 is a schematic diagram of a positioning disk of the present invention;

[0047] Figure 6 is a cross-sectional view of the installation position of the positioning block of the present invention;

[0048] Figure 7 is a schematic diagram of the positioning hole of the present invention;

[0049] Figure 8 It is a left side view of the nozzle of the present invention;

[0050] In the figure: 11, cyclone dust removal component, 12, dust removal chamber, 121, slide plate, 13, bubble breaking component, 14, negative pressure component, 15, fan, 16, dust collection chamber, 17, sewage outlet, 18, support frame;

[0051] 21. foaming chamber, 22. foaming agent chamber, 23. air duct, 24. high-pressure water pipe, 25. delivery pipe group, 251. first delivery pipe, 252. second delivery pipe, 253. sealing ring, 254. sealing ring, 255. limit block;

[0052] 3. Controller, 31. First solenoid valve, 32. Second solenoid valve, 33. Foam sensor, 34. Dust sensor, 4. Foaming net group, 41. Metal foaming net, 42. Blade, 51. Sprinkler, 511. Sawtooth block, 52. Positioning plate, 521. Blind hole, 522. Spring, 523. Positioning block, 53. Articulated shaft, 54. Positioning rod, 55. Torsion spring. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] like Figure 1 As shown, the two-stage foam dust removal system for mining comprises a cyclone dust removal component 11, a dust removal chamber 12, a foam breaking component 13, and a negative pressure component 14 which are sequentially connected from left to right;

[0055] A foaming component for generating foam is provided above the dust removal chamber 12, and an output end of the foaming component is connected to a nozzle 51 of a conical structure located in the dust removal chamber 12 through a delivery pipe group 25;

[0056] A foaming net group 4 for secondary foaming is rotatably installed in the delivery pipe group 25, and the nozzle 51 is arranged to rotate downward 0-60 degrees and is positioned at an angle by a limit assembly thereon;

[0057] Specifically, the system can be installed through the support frame 18, and the negative pressure component 14 is installed on the far right. After the negative pressure is generated, not only the dust-laden airflow enters from the inlet end of the cyclone dust removal component 11, but also the cyclone dust removal component 11 can be started to initially reduce the dust from the dust-laden airflow, that is, the cyclone dust removal component 11 can be a rotating fan blade rotatably installed in the dust removal cylinder, or a rotating fan blade that rotates with its own power; the foam breaking component 13 can adopt a shutter foam breaking structure or a conventional foam breaking structure, which mainly realizes the foam breaking of the micelle foam wrapped in the dust, so as to facilitate the sedimentation of the dust-laden foam after the crushing;

[0058] The dust-laden airflow first passes through the cyclone dust removal component 11 to settle large dust particles, then passes through the dust removal chamber 12 for secondary dust removal of floc foam, and then the foam wrapped in dust passes through the foam breaking component 13 for foam breaking treatment, and the broken dust-laden foam is settled and discharged, and the clean airflow is finally discharged from the negative pressure component 14;

[0059] The foaming component mainly produces foam, and performs secondary foaming through the foaming net group 4 in the conveying pipe group 25, and finally the foam is sprayed out from the nozzle 51, and the nozzle 51 is arranged to rotate downward by 0-60°, that is, in the initial state, the center line of the nozzle 51 is horizontally arranged at 0°. The wind force of the dust-laden airflow acts on the nozzle 51 to adjust its angle. The downward inclination angle of the conical nozzle 51 increases to ensure that the sprayed foam fully collides with the dust-laden airflow and improves the dust capture rate. Therefore, the secondary foaming and the angle adjustment of the nozzle 51 with the change of the dust-laden airflow can effectively improve the foam utilization rate and the dust coverage rate, greatly reduce energy consumption, and solve the dust foam pollution problem.

[0060] like Figure 2 , Figure 3 As shown, further, the foaming net group 4 includes a rotatably mounted metal foaming net 41, and blades 42 that are uniformly arranged around the metal foaming net 41 and are set at the same inclination angle;

[0061] The metal foam net 41 is composed of a plurality of metal wires that cross each other in a tic-tac-toe structure, and each metal wire is an S-shaped structure;

[0062] Specifically, the diameter of the conveying pipe group 25 can be 30 mm, and a limit block 255 is provided therein. The foaming net group 4 is installed on the limit block 255 and is arranged to rotate. The diameter of the metal foaming net 41 is 20 mm. On the one hand, it is composed of a plurality of metal wires that cross horizontally and vertically to form a tic-tac-toe structure. Each metal wire is an S-shaped structure, that is, the metal foaming net 41 is in the shape of teeth. This structure increases the foaming rate, prevents the foam from being lost through the conveying pipe group 25, promotes secondary foaming, and forms agglomerate foam. On the other hand, a plurality of blades 42 are provided on the side of the metal foaming net 41. The number of blades 42 can be 10-12, and the inclination angle is 60°. That is, after the foam flows through the metal foaming net 41 in the conveying pipe group 25, the blades 42 rotate under the action of the airflow, driving the metal foaming net 41 to rotate, and further generating agglomerate foam through relative movement to achieve full coverage of dust.

[0063] Furthermore, the delivery pipe group 25 includes a first delivery pipe 251 having one end connected to the output end of the foaming component and a second delivery pipe 252 having one end connected to the nozzle 51;

[0064] The other end of the second delivery pipe 252 is a T-shaped structure, and is close to the other end of the first delivery pipe 251 with external threads and there is a gap between them;

[0065] A sealing ring 253 is slidably provided on the second delivery pipe 252. The sealing ring 253 is limited by the T-shaped structure of the second delivery pipe 252 and its thread matches the external thread on the first delivery pipe 251. The foaming net group 4 is located at the T-shaped structure port of the second delivery pipe 252.

[0066] Specifically, there is a gap between one end of the first delivery pipe 251 and the second delivery pipe 252, which is mainly convenient for the quick disassembly and assembly of the foaming net group 4. When the foaming net group 4 is placed at the T-shaped structure port of the second delivery pipe 252, the sealing ring 253 is moved so that one end of it is pressed against the T-shaped structure of the second delivery pipe 252 for sealing and limiting. A sealing ring 254 can be provided at the contact position, and the other end of the sealing ring 253 is threadedly installed on the first delivery pipe 251 to achieve a sealed connection between the first delivery pipe 251 and the second delivery pipe 252.

[0067] like Figure 4 As shown, illustratively, the nozzle 51 is rotatably connected to the end of the delivery pipe group 25 via a hinge shaft 53;

[0068] The limiting assembly includes a fixedly mounted positioning plate 52;

[0069] The nozzle 51 is provided with a positioning rod 54 with a positioning hole, and the positioning plate 52 is provided with a plurality of positioning blocks 523 which are elastically arranged and matched with the positioning holes, wherein one of the positioning blocks 523 is embedded in the positioning hole when the nozzle 51 rotates;

[0070] The hinge shaft 53 is provided with a torsion spring 55 for driving the nozzle 51 to return to the 0° angle.

[0071] like Figure 5 , Figure 6 As shown, further, the positioning plate 52 is provided with a plurality of evenly arranged blind holes 521 in an arc shape, and a positioning block 523 is movably arranged in the blind hole 521, and one end of the positioning block 523 is in contact with the spring 522 in a compressed state;

[0072] The blind hole 521 is provided with a retaining ring for limiting the positioning block 523;

[0073] Specifically, when the dust-laden air volume is large, the downward inclination angle of the conical foam nozzle 51 increases to ensure that the sprayed foam fully collides with the dust-laden air flow, so that the foam and dust are mixed more evenly, thereby improving the dust capture rate;

[0074] The positioning rod 54 can extend along the generatrix of the nozzle 51, and the nozzle 51 is rotatably connected to the end of the conveying pipe assembly 25 through the hinge shaft 53, so that the nozzle 51 and the conveying pipe assembly 25 can rotate relative to each other. The positioning plate 52 can be fixedly installed on the conveying pipe assembly 25, and the angle limit is mainly achieved by matching with the positioning rod 54;

[0075] When air enters the dust removal chamber 12 and impacts the side of the nozzle 51, the nozzle 51 moves downward and drives the positioning rod 54 to rotate with the hinge shaft 53 as the center. At this time, the elastically arranged positioning block 523 on the positioning plate 52 will be embedded in the positioning hole on the positioning rod 54 to achieve angle limiting. When the air volume is large, the nozzle 51 deflects downward at a larger angle and overcomes the elastic force of the torsion spring 55. When the air volume decreases, under the action of the elastic force of the torsion spring 55, the torsion spring 55 on the hinge shaft 53 drives the nozzle 51 to return to the 0° state.

[0076] like Figure 7 , Figure 8 As shown, further, the side of the positioning block 523 close to the positioning hole is a quadrangular pyramid structure;

[0077] The nozzle 51 is provided with a spirally arranged sawtooth block 511;

[0078] At this time, the four-sided pyramid structure positioning block 523 can be better embedded in the positioning hole, and under the action of the air volume reduction and the torsion spring 55, the positioning block 523 can break away from the positioning hole and rebound to the initial state; in addition, a spirally arranged sawtooth block 511 is provided inside the nozzle 51, so that the foam passes through the spirally arranged sawtooth block 511, effectively reducing the foam loss.

[0079] like Figure 1 As shown, exemplarily, the foaming component includes a foaming chamber 21 and a foaming agent chamber 22 located in the foaming chamber 21; the foaming chamber 21 is interconnected with an air pipe 23 and a high-pressure water pipe 24;

[0080] The negative pressure assembly 14 includes a support cylinder installed on the right side of the bubble breaking assembly 13, and a fan 15 rotating inside the support cylinder;

[0081] Furthermore, a dust collecting chamber 16 is provided at the lower end of the cyclone dust removal component 11 connected to the dust removal chamber 12, and a dust outlet 17 is provided at the bottom end of the bubble breaking component 13;

[0082] The bottom end of the inner wall of the dust removal chamber 12 is provided with a sliding plate 121 located between the dust collection chamber 16 and the dust outlet 17 and arranged with the left side higher and the right side lower;

[0083] Specifically, the slope of the sliding plate 121 is greater than 10%, and the scattered large particles of dust are collected and made to slide down to the sewage outlet 17. The surface of the sliding plate 121 is coated with a silicone water-based waterproof and slip-enhancing coating with a thickness of 0.5-1 cm to prevent the dust from adhering to the surface of the sliding plate 121 and affecting the collection and treatment of the scattered large particles of dust;

[0084] When the dust-laden airflow passes through the cyclone dust removal assembly 11, large dust particles settle into the bottom dust collection chamber 16, and the scattered large dust particles settle on the sliding plate 121 and slide to the sewage outlet 17, completing the primary dust removal of the dust-laden airflow;

[0085] The flocculent foam wrapped around the dust is broken by the frothing component 13, and the broken dust-containing foam settles to the sewage outlet 17, completing the secondary dust removal of the airflow.

[0086] Exemplarily, the device further includes a linkage control component, which includes a controller 3, a first solenoid valve 31 installed on the foaming agent chamber 22 for adjusting the amount of foaming agent, a second solenoid valve 32 installed on the air duct 23 and the high-pressure water pipe 24 respectively and used to control the flow rate of the corresponding medium, a dust sensor 34 installed at the entrance end of the cyclone dust removal component 11 for measuring the dust concentration, and a foam sensor 33 located at the top of the dust removal chamber 12 and on the left side of the nozzle 51 for sensing the foam height;

[0087] The controller 3 is respectively connected to the first solenoid valve 31, the second solenoid valve 32, the dust sensor 34, and the foam sensor 33, and controls their corresponding actions;

[0088] Specifically, the controller 3 can be a PLC industrial controller 3; for every 10 cm increase in the sensing distance of the foam sensor 33, the foaming amount of the foaming chamber 21 is feedback-controlled to increase by 10%, thereby ensuring the filling amount of the foam in the dust removal chamber 12, so that the floc foam can completely cover the airflow dust and improve the dust removal rate.

[0089] The dust sensor 34 on the left side of the cyclone dust removal assembly 11 senses the dust concentration in the dust-laden airflow and transmits the signal to the controller 3. The controller 3 controls the opening and closing of the second solenoid valve 32 on the high-pressure water pipe 24 to change the high-pressure water pressure, and controls the second solenoid valve 32 on the air pipe 23 to change the volume of air entering the foaming chamber 21, and controls the opening and closing degree of the first solenoid valve 31 at the bottom of the foaming agent chamber 22 to adjust the amount of foaming agent, thereby generating controllable quantitative foam;

[0090] High-pressure water, air and foaming agent are fully mixed in the foaming chamber 21 to form foam. After the foam flows through the metal foaming net 41 in the conveying pipe group 25, the rotating blades 42 rotate under the action of the airflow, driving the metal foaming net 41 to rotate, and further generate floc foam through relative movement to achieve full coverage of dust.

[0091] The foam sensor 33 is arranged at the top of the dust removal chamber 12 and is located 10 cm to the left of the nozzle 51. It senses the distance between the generated colloid foam and the top of the dust removal chamber 12, feeds back to the controller 3, and transmits information to ensure the volume of foam generation.

[0092] When the two-stage foam dust removal system for mining is used, the negative pressure component 14 is first started, and the fan 15 can be a variable frequency fan 15, which rotates at high speed to generate negative pressure, so that the dust-laden airflow enters from the cyclone dust removal component 11 of the system;

[0093] The cyclone dust removal assembly 11 rotates and stirs the dust-laden airflow, so that large dust particles settle into the dust collection chamber 16 at the bottom, and the scattered large dust particles settle onto the sliding plate 121 and slide down to the dust outlet 17, thus completing the primary dust removal of the dust-laden airflow;

[0094] The foaming component mainly produces foam, that is, water enters the foaming chamber 21 from the high-pressure water pipe 24, air enters the foaming chamber 21 from the air pipe 23, and the foaming agent in the foaming agent chamber 22 enters the foaming chamber 21. The three are mixed with each other to produce foam, and the primary foaming is completed. After the foam flows through the metal foaming net 41 in the conveying pipe group 25, the blade 42 rotates under the action of the airflow, driving the metal foaming net 41 to rotate, and further produces floc foam through relative movement, realizing secondary foaming, and achieving full coverage of dust;

[0095] The dust sensor 34 on the left side of the cyclone dust removal assembly 11 senses the dust concentration in the dust-laden airflow and transmits the signal to the controller 3. The controller 3 controls the opening and closing of the second solenoid valve 32 on the high-pressure water pipe 24 to change the high-pressure water pressure, and controls the second solenoid valve 32 on the air duct 23 in conjunction to change the volume of air entering the foaming chamber 21, and controls the opening and closing degree of the first solenoid valve 31 at the bottom of the foaming agent chamber 22 to adjust the amount of foaming agent, thereby generating controllable quantitative foam; the high-pressure water, air and foaming agent are fully mixed in the foaming chamber 21 to form foam, and after the foam flows through the metal foaming net 41 in the conveying pipe group 25, the rotating blades 42 rotate under the action of the airflow, driving the metal foaming net 41 to rotate, and further generating floc foam through relative movement to achieve full coverage of the dust;

[0096] The secondary foaming gel foam is sprayed out from the nozzle 51 of the cone structure, and the foam sensor 33 is arranged at the top of the dust removal chamber 12 to sense the distance between the generated gel foam and the top of the dust removal chamber 12, and feed back to the controller 3 to transmit information to ensure the volume of foam generation;

[0097] The dust-laden airflow after primary dust removal acts on the nozzle 51 to adjust its angle, that is, when the dust-laden air volume is large, the nozzle 51 deflects downward at a larger angle, and when the air volume decreases, the nozzle 51 gradually returns to the 0° state, and the dust-laden airflow mixes with the floc foam to perform foam dust reduction, and the floc foam wrapped in dust is broken by the floc breaking component 13, and the broken dust-laden foam settles to the sewage outlet 17, completing the secondary dust removal of the airflow, and the clean airflow is discharged from the negative pressure component 14;

[0098] Finally, the fan 15 is turned off to clean the dust in the dust collection chamber 16 and the dust outlet 17.

[0099] In addition, the two-stage foam dust removal system for mining also includes a mechanical vibration cleaning system, that is, the dust removal chamber 12 can be installed on the mechanical vibration cleaning system, and the mechanical vibration cleaning system is started, and the sliding plate 121 vibrates to make the dust slide to the outlet 17, thereby completing the removal of residual dust. The mechanical vibration cleaning system is started once every 1-2 days, and the vibration frequency is set to 100-500 times / min.

[0100] The present invention relates to a control method for a two-stage foam dust removal system for mining. Through secondary foaming, secondary dust removal, and corresponding linkage control through a controller, the foaming and dust removal are ensured to be carried out in sequence. This method not only effectively improves the foam utilization rate and dust coverage rate, greatly reduces energy consumption, and solves the problem of dust-containing foam pollution, but also ensures that the sprayed foam fully collides with the dust-containing airflow, thereby improving the dust capture rate.

[0101] Example 1

[0102] First, the extraction variable frequency fan 15 is turned on, and the dust-laden airflow enters the system;

[0103] After the airflow passes through the cyclone dust removal assembly 11, large dust particles settle into the bottom dust collection chamber 16, and the escaped large dust particles settle on the sliding plate 121 and slide to the outlet 17, completing the first-level dust removal of the airflow;

[0104] Again, the dust sensor 34 at the front end of the cyclone dust removal assembly 11 senses the dust concentration in the dust-laden airflow and transmits the signal to the controller 3. The sensed dust concentration is 100 mg / m 3 The controller 3 controls the second solenoid valve 32 on the high-pressure water pipe 24 to open, and the high-pressure water pressure is 3.5MPa. The second solenoid valve 32 on the air pipe 23 is controlled to open, and the air flow rate into the foaming chamber 21 is 100m 3 / min, and control the first solenoid valve 31 at the bottom of the foaming agent chamber 22 to open, and adjust the foaming agent flow rate to 0.1m 3 / min, the foam flow rate is 10m 3 / min; high-pressure water, air and foaming agent are fully mixed in the foaming chamber 21 to form foam, and after the foam flows through the metal foaming net 41 in the foam delivery pipe group 25, the rotating blade 42 rotates under the action of the airflow, driving the metal foaming net 41 to rotate, and further generates floc foam through relative movement to achieve full coverage of dust;

[0105] Then, the floc foam is sprayed out by the conical structure nozzle 51 at the end of the conveying pipe group 25. When the air volume increases, the nozzle 51 will automatically adjust the spray angle downward. The floc foam completes the secondary dust removal for the dust. The floc foam wrapped in the dust is broken by the foam breaking component 13, and the broken dust-containing foam settles to the sewage outlet 17.

[0106] The foam sensor 33 at the top of the dust removal chamber 12 senses that the distance between the foam and the top of the dust removal chamber 12 is 15 cm, and feeds back to the controller 3, which transmits the information to the second solenoid valve 32 on the high-pressure water pipe 24 to adjust the foam volume to 11m 3 / min.

[0107] The mechanical vibration cleaning system is started, and the cleaning frequency is set to 300 times / min. The dust on the sliding plate 121 vibrates and slides to the sewage outlet 17, completing the removal of the remaining dust;

[0108] Finally, the fan 15 is turned off to clean the dust in the dust collection chamber 16 and the dust outlet 17.

[0109] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

Claims

1. A two-stage foam dust removal system for mining, characterized in that: It comprises a cyclone dust removal component (11), a dust removal chamber (12), a bubble breaking component (13), and a negative pressure component (14) which are connected in sequence from left to right; A foaming component for generating foam is provided above the dust removal chamber (12), and an output end of the foaming component is connected to a nozzle (51) of a conical structure located in the dust removal chamber (12) via a delivery pipe group (25); A foaming net group (4) for secondary foaming is rotatably installed in the conveying pipe group (25), and the nozzle (51) is arranged to rotate downward by 0-60 degrees and is positioned at an angle by a limit assembly thereon; The foaming net group (4) comprises a rotatably mounted metal foaming net (41), and blades (42) which are evenly arranged around the metal foaming net (41) and are arranged at the same inclination angle. The metal foam net (41) is composed of a plurality of metal wires that cross each other in a tic-tac-toe structure, each metal wire being an S-shaped structure; The delivery pipe group (25) comprises a first delivery pipe (251) having one end connected to the output end of the foaming component and a second delivery pipe (252) having one end connected to the nozzle (51); the other end of the second delivery pipe (252) is a T-shaped structure and is close to the other end of the first delivery pipe (251) with an external thread and there is a gap between them; A sealing ring (253) is slidably provided on the second delivery pipe (252), the sealing ring (253) is limited by the T-shaped structure of the second delivery pipe (252), and the thread thereof matches the external thread on the first delivery pipe (251), and the foaming net group (4) is located at the T-shaped structure port of the second delivery pipe (252); The spray head (51) is rotatably connected to the end of the delivery pipe group (25) via a hinge shaft (53); The limiting assembly comprises a fixedly mounted positioning plate (52); The nozzle (51) is provided with a positioning rod (54) with a positioning hole, and the positioning plate (52) is provided with a plurality of positioning blocks (523) which are elastically arranged and matched with the positioning holes, wherein one of the positioning blocks (523) is embedded in the positioning hole when the nozzle (51) rotates; and the hinge shaft (53) is provided with a torsion spring (55) which drives the nozzle (51) to return to a 0° angle.

2. A two-stage foam dust removal system for mining according to claim 1, characterized in that: The positioning plate (52) is provided with a plurality of evenly arranged blind holes (521) in an arc shape, a positioning block (523) is movably arranged in the blind hole (521), one end of which is in contact with the spring (522) in a compressed state; a retaining ring for limiting the positioning block (523) is provided at the end of the blind hole (521).

3. A two-stage foam dust removal system for mining according to claim 2, characterized in that: The side of the positioning block (523) close to the positioning hole is a quadrangular pyramid structure; the interior of the nozzle (51) is provided with a spirally arranged sawtooth block (511).

4. A two-stage foam dust removal system for mining according to any one of claims 1 to 3, characterized in that: The foaming component comprises a foaming chamber (21) and a foaming agent chamber (22) located in the foaming chamber (21); the foaming chamber (21) is interconnected with an air duct (23) and a high-pressure water pipe (24); the negative pressure component (14) comprises a support cylinder installed on the right side of the foam breaking component (13) and a fan (15) located in the support cylinder for rotation.

5. A two-stage foam dust removal system for mining according to claim 4, characterized in that: A dust collection chamber (16) is provided at the lower end of the cyclone dust removal component (11) connected to the dust removal chamber (12), and a dust outlet (17) is provided at the bottom end of the bubble breaking component (13); a sliding plate (121) is provided at the bottom end of the inner wall of the dust removal chamber (12), which is located between the dust collection chamber (16) and the dust outlet (17) and is arranged higher on the left and lower on the right.

6. A two-stage foam dust removal system for mining according to claim 5, characterized in that: The invention also comprises a linkage control component, which comprises a controller (3), a first electromagnetic valve (31) installed on the foaming agent chamber (22) for adjusting the amount of foaming agent, a second electromagnetic valve (32) installed on the air duct (23) and the high-pressure water pipe (24) for controlling the flow rate of the corresponding medium, a dust sensor (34) installed at the entrance end of the cyclone dust removal component (11) for measuring the dust concentration, and a foam sensor (33) located at the top of the dust removal chamber (12) and on the left side of the nozzle (51) for sensing the height of the foam; the controller (3) is respectively connected to the first electromagnetic valve (31), the second electromagnetic valve (32), the dust sensor (34) and the foam sensor (33), and controls their corresponding actions.

7. A control method for a two-stage foam dust removal system for mining as claimed in claim 6, characterized in that: The specific steps include: a. The fan (15) is started to generate negative pressure so that the dust-laden airflow enters the cyclone dust removal assembly (11); the cyclone dust removal assembly (11) rotates and stirs the dust-laden airflow so that large dust particles settle into the dust collection chamber (16) at the bottom, while the escaped large dust particles settle onto the sliding plate (121) and slide down to the dust outlet (17), thereby completing the primary dust removal of the dust-laden airflow; b. Water enters the foaming chamber (21) from the high-pressure water pipe (24), air enters the foaming chamber (21) from the air pipe (23), and the foaming agent in the foaming agent chamber (22) enters the foaming chamber (21), and the three are mixed with each other to generate foam, completing the primary foaming; the foam flows through the metal foaming net (41) in the conveying pipe group (25), and the multiple blades (42) on the side of the metal foaming net (41) rotate under the action of the airflow, driving the metal foaming net (41) to rotate, and further generate floc foam through relative movement, completing the secondary foaming; c. The dust sensor (34) on the left side of the cyclone dust removal component (11) senses the dust concentration in the dust-laden airflow and transmits a signal to the controller (3); the controller (3) controls the opening and closing of the second solenoid valve (32) on the high-pressure water pipe (24) to change the high-pressure water pressure, and controls the second solenoid valve (32) on the air pipe (23) to change the volume of air entering the foaming chamber (21), and controls the opening and closing degree of the first solenoid valve (31) at the bottom of the foaming agent chamber (22) to adjust the amount of foaming agent, thereby generating controllable quantitative foam; The secondary foamed gel foam is sprayed out from the nozzle (51) of the conical structure, and the foam sensor (33) at the top of the dust removal chamber (12) senses the distance between the generated gel foam and the top of the dust removal chamber (12), and feeds back to the controller (3), transmitting the information to ensure the volume of foam generation; The dust-laden airflow after primary dust removal acts on the nozzle (51), so that the nozzle (51) automatically adjusts the spray angle according to the change of air volume. When the dust-laden air volume is large, the downward deflection angle of the nozzle (51) increases. When the air volume decreases, the angle of the nozzle (51) gradually returns to a horizontal state. The dust-laden airflow and the floc foam are mixed with each other to perform foam dust reduction. The floc foam encapsulating the dust is broken by the floc breaking component (13). The broken dust-laden foam settles to the sewage outlet (17), completing the secondary dust removal. The clean airflow is discharged from the fan (15). d. Finally, turn off the fan (15) and clean the dust in the dust collection chamber (16) and the dust outlet (17).

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