Mining ore tank dedusting device

Abstract

A mining ore tank dedusting device includes at least one dust hood, at least one pneumatic conveying pipeline and a synchronous transportation system controlled by open and close of valves. The synchronous transportation system includes an air inlet, a movable air box, a ventilation channel, ventilation openings and valves. The movable air box is configured to be an inverted U-shape and is installed at an upper surface of the at least one ventilation channel and is movable synchronously with the at least one pneumatic conveying pipeline. The ventilation openings are provided at an upper surface of the ventilation channel and connect the movable air box and the ventilation channel. The valves are provided in the ventilation openings, with distances between neighboring ventilation openings being smaller than a length of the movable air box to ensure that the movable air box always covers at least one of the ventilation openings.

Description

Mining ore tank dedusting device Technical field The present invention relates to the technical field of dust management in production workshops, specifically a dedusting device for mining ore tank unloading activities. Background technology Mineral materials such as raw ores and sintered ores in steel plants are often stored in several silos with a total length of tens of meters, transported by belts to top portions of silos and then carried by discharging vehicles continuously and orderly to various silos. When loading and unloading the mineral materials, a large amount of dust escapes due to large drop height of the mineral materials and positive pressure in the silos, continuous operation and other factors brings huge dust pollutions in workshops. Existing dust control techniques for mining tank unloading are mainly divided into two categories, the first one is by combination of ventilation channels and external dust removers, and the second one is to move and operate dust removers synchronously with unloading trucks. For the first category dedusting by combination of ventilation channels and external dust removers, the external dust removers are connected with the ventilation channels, and the ventilation channels are mainly used for transporting and sucking dust at unloading points, and there are some existing technical solutions like a movable dust removal / ventilation vehicle (disclosed in ZL201821339696.0, ZL200720086152.3 and ZL201811175865.6), a partition ventilation channel (disclosed in ZL201520040533.2) and so on. The ventilation channels used in present technical solutions are connected by steel structures on the lower, left and right sides and upper portions thereof are sealed by belts. With this method certain ventilation and suction effects can be achieved when the belts cover the left and right sides properly, and the dust generated at unloading points can be absorbed to a certain extent. However, lengths of the ventilation channels are generally tens of meters or even hundreds of meters. With the increase of running time, the belts are frequently opened and closed, problems such as belt deviation, belt aging, belt deformation, etc. are very liable to occur, so as to directly lead to a large area of air leakage in upper portions of the ventilation channels, and suction air of the dust removers cannot be transmitted to the unloading points, therefore a good dust collection effect cannot be achieved. Therefore, weak sealing of the upper belts of the ventilation channels is the Achilles heel of the traditional ventilation slots. In the second category that dust removers move and operate synchronously with unloading trucks, dust removers are installed next to unloading trucks; dust sucked at unloading points directly enters the dust removers for purification. In this way, the dust removers and the unloading cars operate synchronously, and there is no movable ventilation channel, which can avoid air leakage in the ventilation channel to a certain extent. There are some existing technical solutions like a fully enclosed mobile ventilation and dust removal system (disclosed in ZL201410303004.7), a parallel moving cloth bag filter (disclosed in ZL201310127255.X), a mobile flatbed truck equipped with pulse dust collector (disclosed in ZL200620076303.2and ZL200720042556.2), and so on. However, the dust removers of the present category in the mentioned technical solutions need to run synchronously with the unloading trucks, and the dust removers are located indoors, which greatly restrict volumes of the dust removers. When volumes of the dust removers are reduced, upper limits of the dust removers' processing capacities are reduced accordingly, exhausting air volumes at unloading points are obviously insufficient, consequently dust removal effects are not satisfactory. At the same time, the dust removers are arranged indoors, and it is more difficult to conduct maintenance works such as dust removal and bag replacement, which affects the dust removal effect as well. In addition, when the dust removers move with the unloading vehicles, cables that supply power also follow, that is to say, high-power cables move back and forth within distances of tens of meters or even hundreds of meters, which will reduce the reliability of the cables, increase the failure rate of power supply, and cause leakage danger. Finally, overall weights of dust removers are so large that additional powers need to be equipped to follow reciprocating motions of the unloading vehicles, which will increase energy consumption of total systems, further, dust removers are equipped with independent powers and unloading vehicles are equipped with independent powers, which increase difficulties of synchronous movement of the mentioned two and increase the failure rate of the entire systems. Summary of the invention To overcome the deficiencies of the prior art, the present invention provides a mining ore tank dedusting device, comprising at least one dust hood, pneumatic conveying pipelines, a synchronous transportation system controlled by open and close of valves and a dedusting device. Both the at least one dust hood for dust capturing and the pneumatic conveying pipelines for dust conveyance are fixed on an unloading vehicle and move synchronously therewith, the at least one dust hood is placed on above where materials leave belts and enter silos, the dedusting device generates a withdrawing force, consequently, a negative pressure is formed in the synchronous transportation system controlled by open and close of valves and the pneumatic conveying pipelines, the negative pressure is then transmitted to the at least one dust hood, so that the dust generated during material unloading is withdrawn and sucked up, the dust enters subsequently the pneumatic conveying pipelines via the synchronous transportation system controlled by open and close of valves and then removed by the dedusting device. Ends of the pneumatic conveying pipelines are connected with the at least one dust hood, another ends thereof are connected with an air inlet of the synchronous transportation system controlled by open and close of valves. The synchronous transportation system controlled by open and close of valves comprises the air inlet, a movable air box, a ventilation channel, ventilation openings and valves, the movable air box is configured to be similar to an inverted U, is movably installed on an upper surface of the ventilation channel and is movable synchronously with the pneumatic conveying pipelines, the ventilation channel is a structure closed at four sides, the ventilation openings are provided at an upper surface of the ventilation channel and communicate the movable air box and the ventilation channel, the valves are located in the ventilation openings, distances between adjacent ventilation openings are smaller than a length of the movable air box so as to ensure that at any moment the movable air box covers at least one of the ventilation openings. The movable air box moves synchronously with the discharging vehicle, when the movable air box moves to above one of the ventilation openings, the valve in the ventilation opening is opened, the other valves are closed so that a negative pressure is present in the ventilation channel, the at least one dust hood, the pneumatic conveying pipelines and the movable air box are connected with the ventilation openings, the dust is removed after being sent to the dedusting device by the at least one dust hood, the pneumatic conveying pipelines, the movable air box, the ventilation openings and the ventilation channel. Further, the present invention further comprises at least one azimuth stowing switch, the valves comprise automatic valves, when the movable air box moves to above one of the ventilation openings, by starting the automatic valves with the at least one azimuth stowing switch, and when the movable air box leaves one of the ventilation openings, the automatic valves are closed by the at least one azimuth stowing switch. Further, air box rollers are provided underneath the movable air box, roller guides are provided on the ventilation channel, the air box rollers are installed underneath the movable air box and run on the roller guides so that friction during movement of the movable air box is reduced and synchronous movement of the movable air box on an upper surface of the ventilation channel along with the pneumatic conveying pipelines are realized to a better extent. Further, two air curtain generators are provided in the movable air box, the two air curtain generators are provided respectively at a head end portion and a tail end portion of the movable air box, with the two air curtain generators downward air curtains are produced so as to realize cleaning of the dust on a top portion of the ventilation channel. Further, the at least one dust hood is provided to be more than one, provided in front of, in and behind a discharging place so as to realize a higher cleaning rate and prevent leakage of the dust. Further, the mining ore tank dedusting device comprises further silo supporting ducts, the silo supporting ducts are connected with the silos and the ventilation groove, the dedusting device generates air withdrawing forces, as a result, a negative pressure is formed in the ventilation groove and conducted to the silo supporting ducts, so that the dust generated during material unloading can be cleaned. Further, an air curtain generator is provided at above each of the dust hoods, the air curtain generator produces high speed downward air flow along an edge of each of the dust hoods, with guiding effects of air curtain jet, an inner side and an outer side of each of the dust hoods can be isolated effectively so as to prevent dust from escaping. Further, a closing device is provided on the at least one dust hood, the closing device comprises a rubber belt and wheels, the wheels are provided to be at least four, provided at a front end portion, a rear end portion and upper turning points of the at least one dust hood, the wheels at the front end portion and the rear end portion of the at least one dust hood are provided on the rubber belt exerting a downward pressure on the rubber belts, the wheels at the upper turning points of the at least one dust hood are provided underneath the rubber belt for changing a moving direction of the rubber belt, when the unloading place is changed, the dust hoods will move along the unloading vehicle, when the dust hoods are moving, the wheels at the front end portion and the rear end portion of the at least one dust hood are driven to rotate, so that the rubber belt moves at a speed equal to a speed of the at least one dust hood, consequently, the rubber belt in a moving direction is raised up whether the rubber belt at an opposite direction is pressed down on mining ore tanks, the mining ore tanks not covered by the dust hoods are closed so that no dust will escape. In accordance with an aspect of at least one embodiment, there is provided a mining ore tank dedusting device, comprising: at least one dust hood, at least one pneumatic conveying pipeline, a synchronous transportation system controlled by open and close of valves and a dedusting device, wherein the at least one dust hood and the at least one pneumatic conveying pipeline are fixed on an unloading vehicle and move along therewith, the at least one dust hood is placed on above where materials leave silos, one end of the at least one pneumatic conveying pipeline is connected with the at least one dust hood, another end thereof is connected with an air inlet of the synchronous transportation system controlled by open and close of valves, the synchronous transportation system controlled by open and close of valves comprises the air inlet, a movable air box, a ventilation channel, ventilation openings and the valves, the movable air box is configured to be similar to an inverted U, movably installed on an upper surface of the ventilation channel and is movable synchronously with the at least one pneumatic conveying pipeline, the ventilation channel is a structure closed at four sides, the ventilation openings are located on an upper surface of the ventilation channel, communicating the movable air box and the ventilation channel, the valves are provided in the ventilation openings, and distances between neighboring ventilation openings are smaller than a length of the movable air box; wherein air box rollers are provided underneath the movable air box, roller guides are provided on the ventilation channel, the air box rollers are installed underneath the movable air box and the air box rollers move on the roller guides. Compared with the prior art, in the present invention, mechanical principles are used to address the deficiency of air leakage of the ventilation channels with conventional belt sealing methods, the ventilation channel is a structure closed at four sides, the ventilation channel communicates with the foreign world only by the ventilation openings, the ventilation openings are open or closed by the valves, which is of high reliability, and nearly no air leakage is observed, as the air tightness is good, dedusting air quantity required is significantly reduced, in the meanwhile, with the movable air box, transportation of dust-laden air flows between two ventilation openings can be done, as at least one ventilation opening communicates the movable air box and the ventilation groove at any moment, during continuous unloading, dedusting air flow smoothness can be promised, dedusting effects can be significantly improved and dedusting energy consumption reduced. Brief description of drawings The foregoing and / or other aspects and advantages of the present invention will become apparent and comprehensible when taken in conjunction with the following drawings, wherein: Figure 1 is a structural diagram showing a mining ore tank dedusting device according to the present invention; Figure 2 is a lateral structural diagram showing the mining ore tank dedusting device according to the present invention; Figure 3 is a structural diagram showing a closing device provided on the at least one dust hood; and Figure 4 is a diagram showing the mining ore tank dedusting device in use. Markups in the drawings are: 1, dust hood; 2, pneumatic conveying pipeline; 3, synchronous transportation system controlled by open and close of valves; 4, silo; 5, air inlet; 6, movable air box; 7, ventilation channel; 8, ventilation opening; 9, valve, 10, unloading vehicle; 11, air box roller; 12, roller guide; 13, silo supporting duct; 14, closing device; 15, rubber belt and 16, wheel. Embodiments Hereinafter the embodiments of the present invention are to be described in details; examples of the embodiments are shown in the drawings, wherein similar or identical reference numbers are used throughout the description to represent similar or identical elements or elements with similar or identical functions. Hereinafter the embodiments described with reference to the drawings are only exemplary, for explaining the present invention, and shall not be construed as limitation on the present invention. Embodiment 1 A mining ore tank dedusting device as shown in figures 1 and 2, comprising a dust hood 1, pneumatic conveying pipelines 2, a synchronous transportation system 3 controlled by open and close of valves and a dedusting device. Both the dust hood 1 and the pneumatic conveying pipelines 2 are fixed on an unloading vehicle and move together with the unloading vehicle, the dust hood is placed on above where materials leave a rubber belt and enter silos 4, either ends of the pneumatic conveying pipelines 2 are connected with the dust hood, another ends thereof are connected with an air inlet of the synchronous transportation system 3 controlled by open and close of valves. The synchronous transportation system 3 controlled by open and close of valves comprises the air inlet 5, a movable air box 6, a ventilation channel 7, ventilation openings 8 and valves 9, the valves 9 are automatic valves, the movable air box 6 is configured to be similar to an inverted U, is movably installed on an upper surface of the ventilation channel 7 and is movable along with the synchronous transportation pipelines, the ventilation channel 7 is a structure close at four sides, the ventilation openings 8 are provided on an upper surface of the ventilation channel 7, communicate the movable air box 6 and the ventilation channel 7, the automatic valves 9 are provided in the ventilation openings 8, the automatic valves 9 are controlled by azimuth stowing switches, distances between neighboring ventilation openings 8 are smaller than a length of the movable air box 6 so as to ensure that the movable air box 6 covers at least one of the ventilation openings 8 at any moment. The dedusting device produces withdrawing force, a negative pressure can be formed in the synchronous transportation system 3 controlled by open and close of valves and the pneumatic conveying pipelines 2 and is transmitted to the dust hood 1 so as to draw the dust generated during materials unloading, when one of the silos 4 is full of materials, and the unloading vehicle 10 moves to another of the silos 4, the unloading vehicle 10 drives the dust hoods 1, the pneumatic conveying pipelines 2 and the movable air box 6 to move synchronously, when the movable air box 6 is moving to above any of the ventilation openings 8, the automatic valves 9 is opened by the azimuth stowing switches, and when the movable air box 6 moves to above one of the ventilation openings 8, the automatic valves 9 is closed by the azimuth stowing switches, so that when the movable air box 6 moves to above any of the ventilation openings 8, one of the valves 9 in the ventilation openings 8 is started and the other valves 9 located outside the movable air box 6 are maintained shut down so as to promise the negative pressure in the ventilation channel 7, and the dust is removed after entering the dedusting device passing the dust hood 1, the pneumatic conveying pipelines 2, the movable air box 6, the ventilation openings and the ventilation channel 7. Embodiment 2 Compared with the embodiment 1, as an improvement, the dust hoods are provided to be more than one, provided respectively on above where the materials leave the belt and enter the silos 4 and on portions of mining ore tanks next to where the materials fall into the mining ore tank, a closing device 14 is provided on the dust hoods 1, as shown in figure 3, the closing device comprises a rubber belt 15, wheels 16, the wheels 16 are provided to be at least four, provided at front end portions, rear end portions and upper turning points of the dust hoods 1, the wheels 16 at the front end portions and the rear end portions of the dust hoods 1 are located on above the rubber belt 15, exerting a downward pressure on the rubber belt 15, the wheels 16 are the upper turning points of the dust hoods 1 are located underneath the rubber belt 15, configured for changing a moving direction of the rubber belt 15, when an unloading place is changed, the dust hoods 1 will move along with the unloading vehicle 10, when the dust hoods 1 move, the wheels 16 at the front end portions and the rear end portions of the dust hoods 1 are driven to rotate so that the rubber belt 15 and the dust hoods 1 move at an equal speed, so that the rubber belt 15 at the moving direction is raised up and the rubber belt 15 at an opposite direction is pressed down and compressed on the mining ore tank, consequently, the mining ore tank that is not covered by the dust hoods 1 is closed and the dust is prevented from leaking. In the meanwhile, an air curtain generator is provided on the dust hoods 1, high speed downward air flow is formed along edges of the dust hoods, with guiding effects of the air curtain jet, the dust hoods 1 are properly isolated so that no dust will escape. For those skilled in the art, it will be apparent that the present invention is not restricted to details of the foregoing exemplary embodiments, and without departing from the scope of the present invention, it is possible to carry out the present invention in other specific forms. Therefore, no matter viewing from any point, the embodiments shall be taken as exemplary and non-restrictive, the scope of the present invention is limited by the appended claims rather than the foregoing description, therefore, all changes that fall within the scope of equivalents of the claims are covered in the present invention. Reference numbers in the claims shall not be taken as limitation on the corresponding claims. The foregoing are only some preferred embodiments of the present invention, and are not intended to limit the present invention, any slight variation, equivalent replacement and modification to the foregoing embodiments based on the technical essence of the present invention shall be covered in the protection scope of the present invention.

Claims

1. A mining ore tank dedusting device, comprising: at least one dust hood (1), at least one pneumatic conveying pipeline (2), a synchronous transportation system (3) controlled by open and close of valves and a dedusting device, wherein the at least one dust hood (1) and the at least one pneumatic conveying pipeline (2) are fixed on an unloading vehicle (10) and move along therewith, the at least one dust hood (1) is placed on above where materials leave silos (4), one end of the at least one pneumatic conveying pipeline (2) is connected with the at least one dust hood (1), another end thereof is connected with an air inlet (5) of the synchronous transportation system (3) controlled by open and close of valves, the synchronous transportation system (3) controlled by open and close of valves comprises the air inlet (5), a movable air box (6), a ventilation channel (7), ventilation openings (8) and the valves (9), the movable air box (6) is configured to be similar to an inverted U, movably installed on an upper surface of the ventilation channel (7) and is movable synchronously with the at least one pneumatic conveying pipeline (2), the ventilation channel (7) is a structure closed at four sides, the ventilation openings (8) are located on an upper surface of the ventilation channel (7), communicating the movable air box (6) and the ventilation channel (7), the valves (9) are provided in the ventilation openings (8), and distances between neighboring ventilation openings (8) are smaller than a length of the movable air box (6); wherein air box rollers (11) are provided underneath the movable air box (6), roller guides (12) are provided on the ventilation channel (7), the air box rollers (11) are installed underneath the movable air box (6) and the air box rollers (11) move on the roller guides (12).

2. The mining ore tank dedusting device according to claim 1, comprising further azimuth stowing switches, wherein the valves (9) are automatic valves, and the azimuth stowing switches control the automatic valves.

3. The mining ore tank dedusting device according to claim 2, wherein two air curtain generators are provided in the movable air box (6), the two air curtain generators for generating downward air curtains are respectively provided at a head end portion and a tail end portion of the movable air box (6).

4. The mining ore tank dedusting device according to claim 1, wherein the at least one dust hood is provided to be more than one, provided in front of, in and behind an unloading point.

5. The mining ore tank dedusting device according to claim 1, comprising further silo supporting ducts (13), wherein the silo supporting ducts (13) connect the silos (4) and the ventilation channel (7).

6. The mining ore tank dedusting device according to claim 1, wherein at least one air curtain generator is provided in the at least one dust hood (1), wherein the at least one air curtain generator generates high speed downward air flow along an edge of the at least one dust hood (1).

7. The mining ore tank dedusting device according to any one of claims 1-6, wherein a closing device (14) is provided on the at least one dust hood (1), wherein the closing device (14) comprises at least one rubber belt (15) and rollers (16), the rollers (16) are provided to be at least four, provided at a front end portion, a rear end portion and upper turning points of the at least one dust hood (1), the rollers (16) at the front end portion and the rear end portion of the at least one dust hood (1) is located on the at least one rubber belt (15) and the rollers (16) at the upper turning points of the at least one dust hood (1) are located underneath the at least one rubber belt.