Dust reduction device applied to blanking port of inclined guide chute

Abstract

The invention relates to a dust reduction device applied to a blanking port of an inclined guide chute, and the dust reduction device specifically comprises the guide chute, a protective cover, a gas washing box, a sprayer, a coal conveying belt, a filter screen, a drain outlet, a gravity valve, a circulating air pipe, a quick-release and quick-pressing mechanism, a side sealing plate and the like. The sprayer only forms micro-mist in the gas washing box and the circulating air pipe, the micro-mist cannot enter the material guide groove and the protective cover, the moisture of coal is prevented from being affected, in addition, a side sealing plate is installed at the gap between the protective cover and the belt, a plurality of air blocking grooves are formed in the bottom of the side sealing plate, the flow speed of dust airflow is reduced every time the dust airflow passes through one air blocking groove, and therefore the dust flow speed is reduced. The side edge sealing plate is arranged on the coal conveying belt and plays a role in reducing side edge discharge of dust, a tiny water channel is designed in the side edge sealing plate, a layer of water film is formed between the coal conveying belt and the side edge sealing plate, the water film plays a role in sealing, and the device is suitable for some inclined guide groove environments where wet dust removal is difficult to carry out.

Description

Technical Field

[0001] The invention relates to the technical field of dust reduction for conveyors, and in particular to the problem of dust reduction at a material guide chute drop opening. Background Art

[0002] As we all know, belt conveyor is the most important equipment for coal transportation and loading and unloading, and the guide trough is an indispensable part of the conveyor. Due to the limitation of plant space, the guide trough design in some places is inclined, and the direction of material dropping from the guide trough is inconsistent with the belt transmission direction. In this case, the material will slide and collide horizontally at the moment it falls on the belt. This lateral movement increases the friction and collision opportunities between the material particles, and also makes the material flow in the guide trough irregular, and the direction and intensity of the induced airflow are more difficult to predict and control, which makes it more difficult to effectively seal the guide trough. Ultimately, by increasing material collisions, aggravating airflow turbulence and increasing sealing difficulty, the amount of dust generated increases and is more likely to spread into the surrounding environment. If the dust generation is not controlled, a large amount of dust will escape into the air, which will have adverse effects on the health of the staff.

[0003] In the current scheme, spray dust removal, damping curtain dust removal, and fan dust removal are mostly used. However, when the coal transported by the belt is fine coal, the moisture content of the coal must be strictly controlled, and it is forbidden to directly use wet dust removal methods for treatment. In this case, spray dust removal is difficult to use directly, and the difficulty of dust control at the material guide chute is greatly increased. Damping curtain dust removal has a weak blocking effect on fine dust and is not effective. The power of the fan needs to be provided additionally, which consumes a lot of energy, is not conducive to energy saving and consumption reduction, and the installation workload is large. Summary of the invention

[0004] In order to solve the above problems, this article invents a dust reduction device applied to the material outlet of the inclined material guide trough. An air washing box is set on the side of the protective cover of the material outlet of the inclined material guide trough. The box body of the air washing box close to the material outlet is a filter screen. A sewage outlet is set below the air washing box and a gravity valve is installed. A circulating air duct is set above the air washing box and connected to the material guide trough. An observation window is set, and a negative pressure induction sprayer is set on the side of the air washing box and in the circulating air duct. A quick-release quick-pressing mechanism is used to install the side sealing plate at the material guide trough. The bottom of the side sealing plate is close to the edge of the coal conveyor belt, and a water injector is added to the edge of the side sealing device. This device is suitable for some inclined material guide trough environments where wet dust removal is difficult to carry out.

[0005] In the scenario where the inclination direction of the material guide chute is inconsistent with the belt transmission direction, an air washing box is set on the side of the protective cover in the inclination direction of the material guide chute material outlet. This side faces more impact airflow generated by the material drop, so that the air washing box can absorb more dust-laden airflow. A filter is installed on the side of the air washing box close to the material drop outlet. The filter holes can pass the dust-laden airflow generated by the material drop, but prevent coal blocks from entering the air washing box. Negative pressure induced sprayers are set on the side of the scrubber and in the circulating air duct to produce a stable and uniform micro-fog water curtain. When the dusty air contacts the water curtain, the dust particles combine with the water mist and settle down, thereby purifying the dusty airflow. At the same time, a negative pressure environment is formed near the spray area, and the surrounding dusty airflow will naturally flow to this negative pressure area. The micro-fog is only in the scrubber and the circulating air duct, and will not enter the guide trough and the protective cover to prevent the moisture of the coal from being affected. A circulating air duct is set above the scrubber and connected to the guide trough to send the purified clean gas back to the guide trough to realize the air circulation loop and enhance the circulation of the system so that more dusty airflow can be sent into the scrubber. A sewage outlet is set below the scrubber and a gravity valve is installed. When the sewage in the scrubber reaches a certain liquid level, the sewage in the scrubber is discharged in time, and the dusty airflow in the scrubber is prevented from overflowing. An observation window is set above the scrubber, which can be opened to observe the coal flow and facilitate regular maintenance of the filter and scrubber. A quick-release quick-press mechanism is used to install the side sealing plate at the gap between the protective cover and the belt. The lower part of the side sealing plate is close to the edge of the coal conveyor belt. Four wind-blocking grooves are set on the bottom of the side sealing plate. Every time the dust airflow passes through a wind-blocking groove, the dust airflow velocity is attenuated, which plays a role in reducing the side emission of dust. The side sealing plate is made of a softer material and can be deformed, so that the side sealing plate is close to the belt to increase the sealing performance. A tiny water channel is designed inside the side sealing plate, which can be wetted when water is injected. A water injector is added to the edge of the side sealing plate, and a small amount of water is sprayed from the nozzle into the tiny water channel between the side sealing plates. As the coal conveyor belt runs, a layer of water film is formed between the coal conveyor belt and the side sealing plate (due to the small amount of water injection, it will not affect the water content of the coal), which plays a sealing role. When the dust airflow flows through the water film, the water film will also absorb part of the dust, which has a dust removal effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 A schematic structural diagram of a dust reduction device provided according to an embodiment of the present invention is shown.

[0007] Figure 2 A schematic structural diagram of a negative pressure induction sprayer provided according to an embodiment of the present invention is shown.

[0008] Figure 3A schematic structural diagram of a quick-release and quick-pressing mechanism provided according to an embodiment of the present invention is shown.

[0009] Figure 4 A schematic diagram of the position of a side sealing plate and a water injector provided according to an embodiment of the present invention is shown.

[0010] Figure 5 A schematic diagram of assembling an air washing box according to an embodiment of the present invention is shown.

[0011] 1: material guide chute; 2. protective cover; 3: air washing box; 4: sprayer; 5: coal conveyor belt; 6: filter screen; 7: quick release and quick pressure mechanism; 8: side sealing plate; 9: sewage outlet; 10: gravity valve; 11: circulating air duct; 12: observation window; 13: water injector; 41: nozzle; 42: main body shell; 43: fixing screw; 44: water inlet; 45: air inlet; 71: handle; 72: main frame; 73: buckle; 74: bolt; 75: fixing plate; 81: wind blocking slot. DETAILED DESCRIPTION

[0012] In order to make the technical means, creative features, implementation purposes and characteristics adopted by the present invention easier to understand, the content of this invention will be further elaborated in detail in conjunction with the drawings of specific implementation methods. The embodiments and descriptions are only used to illustrate the principles and methods of the present invention. This patent will also have various changes and improvements, which are all within the scope of the invention to be protected. The scope of protection claimed by this patent is defined by the attached claims and their equivalents.

[0013] The embodiment system of the present invention is constructed with reference to the figure, including a material guide chute 1, a protective cover 2, an air washing box 3, a sprayer 4, a coal conveyor belt 5, a filter screen 6, a sewage outlet 9, a gravity valve 10, a circulating air duct 11, a quick-release quick-pressing mechanism 7, a side sealing plate 8, and an observation window 12.

[0014] like Figure 1 , Figure 5As shown, an air washing box 3 is arranged on the side of the protective cover 2 in the inclined direction of the material discharge port of the material guide trough 1. The side faces more impact airflows caused by the material discharge, so that the air washing box 3 can absorb more dust-laden airflows. A filter screen 6 is installed on the side of the air washing box 3 close to the material discharge port. The filter holes can pass the dust-laden airflow caused by the material discharge, but prevent the coal blocks from entering the air washing box 6. A sprayer 4 is arranged in the air washing box 6 and the circulating air duct 11, which can produce a stable and uniform micro-mist water curtain. When the dust-laden air contacts the water curtain, the dust particles combine with the water mist and settle down, thereby purifying the dust-laden airflow. At the same time, a negative pressure environment is formed near the spraying area, and the surrounding dust-laden airflow will naturally flow to this low-pressure area to play a role in drainage. The micro-mist is only in the air washing box 3 and the circulating air duct 11, and will not enter the material guide trough 1 and the protective cover 2. In the hood 2, to prevent the water content of the coal from being affected, a circulating air duct 11 is arranged above the air washing box 3, which is connected to the guide trough 1 to send the purified clean gas back to the guide trough to realize the air circulation loop and enhance the fluidity of the system so as to send more dust-containing airflow into the air washing box 3. A sewage outlet 9 is arranged below the air washing box 3 and a gravity valve 10 is installed. When the sewage in the air washing box 3 reaches a certain liquid level, the sewage in the air washing box 3 is discharged in time, and at the same time, the dust-containing airflow in the air washing box 3 is prevented from escaping into the environment. A quick-release quick-pressing mechanism 7 is used to install a side sealing plate 8 at the gap between the protective cover 2 and the coal conveyor belt 5. The side sealing plate 8 is close to the edge of the coal conveyor belt 5 below to reduce the side leakage of dust. An observation window 12 is arranged above the air washing box 3. The coal flow can be observed when it is opened, and regular maintenance of the filter screen 6 and the air washing box 3 is convenient.

[0015] like Figure 2 As shown, the sprayer 4 is a negative pressure induced sprayer, which may include a nozzle 41, a main body shell 42, a fixing screw 43, a water inlet 44, and an air inlet 45. The nozzle 41 is the outlet of the negative pressure induced sprayer 4, where water and gas are mixed and sprayed out to form a spray. The main body shell 42 is the external structure of the entire device, which plays a role in protecting internal components and connecting various components. The fixing screw 43 is used to tightly connect the negative pressure induced sprayer 4 with the air washing box 3 and the circulating air duct 11. The air inlet 44 is used to connect the air path so that the gas enters the negative pressure induced sprayer 4. The water inlet 44 is used to connect the water path so that water enters the negative pressure induced sprayer 4. The inside of the negative pressure induced sprayer 4 can mix gas and liquid through the Venturi principle.

[0016] like Figure 3As shown, the quick release and quick pressing mechanism 7 is composed of a handle 71, a main frame 72, a buckle 73, a bolt 74 and a fixing plate 75. The handle 71 is used to operate the opening and closing of the quick release and quick pressing mechanism 7. The quick release and quick installation function is realized by rotating the handle 71. The main frame 72 is the main supporting part of the quick release and quick pressing mechanism 7, which plays the role of connecting and fixing other accessories. The buckle 73 is used to connect and fix the main frame 72 with the protective cover 2. The bolt 74 is used to connect the handle 71 with the main frame 72, and at the same time ensure that the handle 71 can rotate flexibly. The fixing plate 75 is used to fix the side sealing plate 8 to ensure the stability of the side sealing plate 8 after installation.

[0017] like Figure 4 As shown, four wind-blocking grooves 81 are arranged at the bottom of the side sealing plate 8. Every time the dust airflow passes through a wind-blocking groove, the flow rate of the dust airflow is attenuated, which plays a role in reducing the side emission of dust. The side sealing plate 8 is made of soft material and can be deformed under the action of gravity. When a large amount of material falls from the guide chute 1 and directly impacts the coal conveyor belt 5, causing the coal conveyor belt 5 to deform, the soft material can be deformed accordingly, so that the side sealing plate 8 is always close to the coal conveyor belt 5, thereby increasing the sealing performance. At the same time, the elastic material can reduce the pressure between the side sealing plate 8 and the coal conveyor belt 5, thereby reducing the friction process. In order to prevent the wear caused by the side sealing plate 8, the bottom plate of the side sealing plate 8 is designed with a tiny water channel, and a water injector 13 is added above the side sealing plate 8. The water injector sprays a small amount of water into the tiny water channel. The water can reach the bottom of the side sealing plate 8 through the tiny water channel, and form a layer of water film between the coal conveyor belt 5 and the bottom of the side sealing plate 8. Since the amount of water injected is small, it will not affect the water content of the coal. The water film fills the gap between the coal conveyor belt 5 and the side sealing plate 8 caused by friction and vibration, and further plays a sealing role. When the dust airflow flows through the water film, it will also absorb part of the dust, and have a certain dust removal effect.

[0018] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-limiting from all points of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any reference numerals in the claims should not be regarded as limiting the claims involved.

[0019] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any slight modification, equivalent substitution and improvement made to the above embodiment based on the technical essence of the present invention should be included in the protection scope of the technical solution of the present invention.

Claims

1. A dust reduction device applied to a material outlet of an inclined material guide chute, comprising a material guide chute (1), a protective cover (2), and a coal conveyor belt (5), characterized in that: The invention also comprises an air washing box (3), a sprayer (4), a filter (6), a sewage outlet (9), and a circulating air duct (11). The air washing box (3) is arranged on the side of the protective cover (2) in the inclined direction of the material outlet of the material guide trough (1). The filter (6) is installed on the side of the air washing box (3) close to the material outlet. The circulating air duct (11) is arranged above the air washing box (3). The circulating air duct (11) is connected to the material guide trough (1). The sprayer (4) is arranged in the air washing box (6) and in at least one of the circulating air duct (11). The sewage outlet (9) is arranged below the air washing box (3).

2. A dust reduction device applied to a material outlet of an inclined material guide chute according to claim 1, characterized in that It also includes a gravity valve (10), which is arranged at the outlet of the sewage outlet (9) below the air washing box (3).

3. A dust reduction device applied to a material outlet of an inclined material guide chute according to claim 2, characterized in that: The sprayer (4) is a negative pressure induced sprayer, comprising a nozzle (41), a main body shell (42), a water inlet (44), and an air inlet (45); the nozzle (41) is the outlet of the negative pressure induced sprayer (4); the air inlet (44) is used to connect to an air circuit; and the water inlet (44) is used to connect to a water circuit.

4. A dust reduction device applied to a material outlet of an inclined material guide chute according to claim 3, characterized in that: It also includes a fixing screw (43) for connecting the negative pressure induction sprayer (4) with the air washing box (3) and the circulating air duct (11).

5. The dust reduction device applied to the drop opening of the inclined material guide chute according to any one of claims 1 to 4, characterized in that: It also includes a quick-release quick-pressing mechanism (7) and a side sealing plate (8). The side sealing plate (8) is arranged at the gap between the bottom of the protective cover (2) and the coal conveying belt (5). The side sealing plate (8) is closely attached to the edge of the coal conveying belt (5) by removing the quick-pressing mechanism (7).

6. A dust reduction device applied to a material outlet of an inclined material guide chute according to claim 5, characterized in that The quick release quick pressing mechanism (7) is composed of a handle (71), a main frame (72), a buckle (73), a bolt (74) and a fixing plate (75). The handle (71) is used to operate the quick release quick pressing mechanism (7) to open and close. The main frame (72) is connected to the protective cover (2) through the buckle (73). The handle (71) is connected to the main frame (72) through the bolt (74). The side sealing plate (8) is fixed by the fixing plate (75).

7. The dust reduction device applied to the drop opening of the inclined material guide chute according to claim 5, characterized in that: A plurality of wind blocking grooves (81) are provided at the bottom of the side sealing plate (8).

8. A dust reduction device applied to a material outlet of an inclined material guide chute according to claim 7, characterized in that: The side sealing plate (8) is made of soft material.

9. A dust reduction device applied to a material outlet of an inclined material guide chute according to claim 8, characterized in that: The bottom plate of the side sealing plate (8) is designed with a tiny water channel, and a water injector (13) is arranged above the side sealing plate (8), and the water injector is connected to the tiny water channel.

10. A dust reduction device applied to a material outlet of an inclined material guide chute according to claim 9, characterized in that: An observation window (12) is provided above the air washing box (3) to facilitate regular maintenance of the filter screen (6) and the air washing box (3).

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