Dust control device and dust removal system for a silo

Abstract

The utility model discloses a dust control device and bin dust removal system relates to dust removal equipment technical field, this dust control device includes conveying mechanism and second conveying pipe, and conveying mechanism includes first conveying pipe and dust cover, and one end of first conveying pipe is used for communicating with dust remover pipeline, and the other end of first conveying pipe communicates with dust cover pipeline, and dust cover is used to set up above bin and opens downward, and is close to feed inlet. The lower end of second conveying pipe is used for communicating with the pipeline of the upper portion of the inside of bin, and the upper end of second conveying pipe extends to the dust cover, and has the preset gap between with dust cover inner wall. Dust control device provided by the utility model can suck away the dust in bin through second conveying pipe on one hand dust cover, on the other hand, the dust outside bin can be sucked away through the gap between second conveying pipe and dust cover, guarantee dust removal effect.

Description

Technical Field

[0001] This utility model belongs to the technical field of dust removal equipment, specifically a dust control device and a dust removal system for silos. Background Technology

[0002] Currently, silos are mainly used for storing dust and granular materials. They generate a lot of dust when feeding materials, which affects the on-site working environment and the health of operators.

[0003] In related technologies, dust collectors are connected to the silos via pipelines to remove dust from inside. Since the air pressure inside the silo fluctuates constantly depending on the amount of material fed in, existing dust collectors for silos, when having excessive suction, tend to suck up both dust and powder. Conversely, when the suction is too weak, a large amount of dust accumulates at the work site. This problem urgently needs to be solved. Utility Model Content

[0004] The purpose of this utility model is to provide a dust control device and a silo dust removal system to solve at least one aspect of the problems and defects mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: In a first aspect, this utility model provides a dust control device for a silo, the silo having a feed inlet at the top, the dust control device comprising: The conveying mechanism includes a first conveying pipe and a dust collection hood. One end of the first conveying pipe is connected to a dust collector pipeline, and the other end of the first conveying pipe is connected to a dust collection hood pipeline. The dust collection hood is installed above the hopper with its opening facing downward and close to the feed inlet. The lower end of the second conveying pipe is used to connect with the upper pipe inside the hopper, and the upper end of the second conveying pipe extends into the dust collection hood, with a preset gap between it and the inner wall of the dust collection hood.

[0006] As a further improvement of this utility model, it also includes: A water-blocking component is disposed around the outer periphery of the second conveying pipe and connected to the inner peripheral wall of the dust collection hood to fill at least part of the preset gap.

[0007] As a further embodiment of this utility model: along the radial direction of the second conveying pipe, the water-blocking member has multiple upper annular channels and multiple lower annular channels from the inside to the outside; Each upper annular channel is connected to each lower annular channel, and the upper outlet of each upper annular channel and the lower inlet of each lower annular channel are inclined toward the second conveying pipe.

[0008] As a further embodiment of this utility model: the inner wall of the dust collection hood has at least two limiting protrusions, and each limiting protrusion is arranged circumferentially around the second conveying pipe. The water-blocking component is annular and has at least two limiting grooves on its outer wall, with each limiting groove arranged at intervals around the circumference of the water-blocking component. The limiting groove includes a first groove segment and a second groove segment that match the limiting protrusion. The first groove segment extends upward and has an opening at the top. The second groove segment extends circumferentially along the water-blocking member and one end is connected to the lower end of the first groove segment. Move the water-blocking component upwards so that each limiting protrusion engages in the corresponding first groove section, and rotate the water-blocking component so that each limiting protrusion engages in the corresponding second groove section to perform limiting.

[0009] As a further embodiment of this utility model: the conveying mechanism also includes a telescopic tube and multiple adjustment components, and the lower end of the first conveying tube is connected to the dust collection hood pipeline through the telescopic tube; The upper end of each adjustment component is connected to the first conveying pipe, and the lower end of each adjustment component is connected to the dust suction hood to adjust the length of the telescopic pipe.

[0010] As a further embodiment of this utility model: at least one of the upper and lower ends of the adjusting component has a hook, and at least one of the first conveying pipe and the dust suction hood has a hooking hole, and the hook is hooked to the corresponding hooking hole.

[0011] As a further embodiment of this utility model: the adjustment assembly includes an upper screw, a screw sleeve, and a lower screw, wherein the threads of the upper screw and the lower screw have opposite directions; The upper end of the upper screw is connected to the first conveying pipe, and the lower end of the upper screw is threadedly connected to the upper end of the screw sleeve. The upper end of the lower screw is threaded to the lower end of the screw sleeve, and the lower end of the lower screw is connected to the dust collection hood.

[0012] As a further improvement of this utility model, it also includes: An electrically controlled valve is installed on the first delivery pipe; The testing component is used to connect to the upper pipeline inside the silo and to detect the air pressure inside the silo. The control unit is electrically connected to the solenoid valve and the detection unit respectively. When the air pressure is greater than or equal to the upper limit pressure, the solenoid valve is controlled to increase its opening degree. When the air pressure is less than or equal to the lower limit pressure, the solenoid valve is controlled to decrease its opening degree.

[0013] As a further improvement of this utility model: the upper limit pressure is -100Pa and the lower limit pressure is -400Pa.

[0014] Secondly, this utility model also provides a silo dust removal system, including a silo, a dust collector, and any of the dust control devices provided in the first aspect, wherein one end of the first conveying pipe is connected to the dust collector pipeline, and the lower end of the second conveying pipe is connected to the upper pipeline inside the silo.

[0015] Compared with the prior art, the beneficial effect of this utility model is that the dust control device includes a conveying mechanism and a second conveying pipe. The conveying mechanism includes a first conveying pipe and a dust collection hood. One end of the first conveying pipe is connected to the dust collector pipeline, and the other end is connected to the dust collection hood pipeline. The dust collection hood is positioned above the hopper with its opening facing downwards and close to the feed inlet. The lower end of the second conveying pipe is connected to the upper pipeline inside the hopper, and the upper end of the second conveying pipe extends into the dust collection hood, with a preset gap between it and the inner wall of the dust collection hood. Therefore, the dust control device provided by this utility model can, on the one hand, allow the dust collection hood to suck away dust inside the hopper through the second conveying pipe, and on the other hand, allow dust outside the hopper to be sucked away through the gap between the second conveying pipe and the dust collection hood, ensuring effective dust removal. Attached Figure Description

[0016] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 A partial structural schematic diagram of the dust removal system for the silo provided by this utility model; Figure 2 for Figure 1 A magnified view of a section at point A in the middle; Figure 3 for Figure 1 A top view of the structure of the central water-retaining component; Figure 4 for Figure 3 A magnified view of a section at point B in the middle; Figure 5 for Figure 1 A magnified view of a section at point C; Figure 6 for Figure 5 A sectional view along section DD.

[0018] Figure label: 10. Hopper; 11. Feed inlet; 100. Conveying mechanism; 110. First conveying pipe; 111. Hanging hole; 120. Dust hood; 121. Limiting protrusion; 130. Telescopic pipe; 140. Adjusting assembly; 141. Upper screw; 142. Screw sleeve; 143. Lower screw; 200. Second delivery pipe; 300. Water-blocking component; 301. Upper annular channel; 302. Lower annular channel; 310. Limiting groove; 311. First groove section; 312. Second groove section; 400. Electrically controlled valve; 500. Test items. Detailed Implementation

[0019] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0020] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0022] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model; that is, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The components of the embodiments of the present utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0025] The existing silo 10 is roughly cylindrical in shape, with a feed inlet 11 at the top for feeding powder materials. When dust from the dust collector is added to the silo 10, it often generates significant dust emissions. Additionally, the process of loading dry materials into the silo 10 (such as a dry desulfurization agent silo) also produces a large amount of dust. Two solutions are typically adopted: one is to add a small dust collector to the silo top, equipped with a dust collector fan, dust collector housing, filter bags, and a filter bag back-blowing device. During silo feeding, the small dust collector controls the dust emissions from the silo top. However, this requires adding a dust collection system and increases investment costs and daily operation and maintenance burden. Secondly, a direct-through dust collection pipe can be added. This involves connecting a dust collection pipe to the top of the silo and directly to the inlet of a nearby large dust collector. The suction power of the dust collector's inlet is used to remove dust generated on the silo top. However, this method has poor adaptability to operating conditions and is difficult to control. It can easily result in excessively strong or weak suction. Excessive suction will draw a large amount of dust from the silo into the dust collector, while insufficient suction will still result in a significant amount of dust on the silo top, causing dust pollution on-site. Production conditions are often variable, and sometimes the amount of dust generated in the silo changes abruptly. For example, a large feed rate can instantly generate a large amount of dust, requiring a larger dust collection airflow; conversely, a small feed rate results in less dust and a smaller required dust collection airflow. Furthermore, the suction power at the inlet of the nearby large dust collector may be unstable, especially when the dust collector fan is operating with a variable frequency drive, which can also affect the dust collection efficiency on the silo top.

[0026] Firstly, please refer to Figure 1-6 As shown, this utility model embodiment provides a dust control device, including: The conveying mechanism 100 includes a first conveying pipe 110 and a dust collection hood 120. One end of the first conveying pipe 110 is connected to a dust collector pipeline, which is used to remove dust for further processing. The other end of the first conveying pipe 110 is connected to the dust collection hood 120 pipeline, which is installed above the hopper 10 with its opening facing downward and close to the feed inlet 11.

[0027] The second conveying pipe 200 has its lower end connected to the upper pipe inside the hopper 10, and its upper end extends into the dust collection hood 120, with a preset gap between it and the inner wall of the dust collection hood 120.

[0028] In this embodiment, the conveying mechanism 100 serves to convey dust. It includes at least a first conveying pipe 110 and a dust collection hood 120. The first conveying pipe 110 may be located above the dust collection hood 120, with its upper end connected to the dust collector (not shown in the figure) and its lower end connected to the dust collection hood 120. Moreover, the dust collection hood 120 is used to collect dust, with its opening facing downwards and located near the feed inlet 11.

[0029] It should be noted that the cross-section of the dust hood 120 can be set as a cone shape that gradually increases from top to bottom, which is beneficial for dust collection.

[0030] In this embodiment, the second conveying pipe 200 is used to convey the dust in the hopper 10 to the dust collection hood 120. Its lower end is connected to the hopper 10 and to the upper pipe inside the hopper 10. The upper end of the second conveying pipe 200 extends into the dust collection hood 120 and leaves a preset gap between it and the inner wall of the dust collection hood 120.

[0031] The lower port area of ​​the dust hood 120 should be larger than the cross-sectional area of ​​the second conveying pipe 200, requiring the lower port area of ​​the dust hood 120 to be 3-6 times the cross-sectional area of ​​the second conveying pipe 200. The diameter of the second conveying pipe 200 should preferably be DN200-DN500. The size of the first conveying pipe 110 should be DN300-DN600, and the pipe flow velocity should be determined based on the maximum feed rate, with a flow velocity of 8-20 m / s, specifically determined according to the dust properties. For denser, heavier dust particles, a higher flue gas flow velocity should be selected, and vice versa. To prevent dust from accumulating in the pipe, the pipe inclination angle should preferably be no less than 10°. Specifically, when powder is loaded into the feed inlet 11, the dust inside the hopper 10 enters the dust collection hood 120 through the second conveying pipe 200 and is drawn away, while the dust outside the hopper 10 is drawn away through the gap between the second conveying pipe 200 and the inner wall of the dust collection hood 120, ensuring that the dust on site is minimized.

[0032] It is worth noting that although the air pressure inside the hopper 10 changes significantly during feeding, only a portion of the dust collector's suction force is applied to the hopper 10 through the second conveying pipe 200, thus avoiding the removal of excessive powder.

[0033] Therefore, the dust control device provided by this utility model can, on the one hand, allow the dust hood 120 to suck away the dust inside the hopper 10 through the second conveying pipe 200, and on the other hand, allow the dust outside the hopper 10 to be sucked away through the gap between the second conveying pipe 200 and the dust hood 120, thus ensuring the dust removal effect.

[0034] In some embodiments, the dust control device provided by this utility model further includes: A water-blocking component 300 is disposed around the outer periphery of the second delivery pipe 200 and connected to the inner peripheral wall of the dust collection hood 120 to fill at least part of the preset gap.

[0035] That is, a water-blocking component 300 is installed in the gap between the outer wall of the second conveying pipe 200 and the inner wall of the dust collection hood 120. The water-blocking component 300 allows air to pass through as much as possible while preventing water from passing through as much as possible. In this way, water can be prevented from entering through the gap between the second conveying pipe 200 and the dust collection hood 120, thus affecting the dust collection effect. Especially when operating on rainy days, it prevents rainwater from being directly sucked into the dust collection hood 120.

[0036] For example, such as Figure 2As shown, along the radial direction of the second conveying pipe 200, the water-blocking member 300 has multiple upper annular channels 301 and multiple lower annular channels 302 from the inside to the outside.

[0037] Each upper annular channel 301 is connected to each lower annular channel 302, and the upper outlet of each upper annular channel 301 and the lower inlet of each lower annular channel 302 are inclined toward the second conveying pipe 200.

[0038] Specifically, the water-blocking component 300 is ring-shaped, with each upper annular channel 301 spaced apart from the inside to the outside, and each lower annular channel 302 also spaced apart from the inside to the outside. The upper annular channel 301 and the lower annular channel 302 are connected, and the cross-section of one side is roughly L-shaped.

[0039] For example, such as Figure 2 As shown, the angles between each upper annular channel 301 and each lower annular channel 302 and the vertical axis can be 30° to 60°. In this way, the air passages that have turned can effectively prevent the water in the lower part from directly entering the second conveying pipe 200 upwards.

[0040] In some embodiments, the inner wall of the dust hood 120 has at least two limiting protrusions 121, each limiting protrusion 121 being arranged circumferentially around the second delivery pipe 200.

[0041] The water-blocking component 300 is annular and has at least two limiting grooves 310 on its outer wall, with each limiting groove 310 arranged circumferentially around the water-blocking component 300.

[0042] The limiting groove 310 includes a first groove segment 311 and a second groove segment 312 that match the limiting protrusion 121. The first groove segment 311 extends upward and has an open upper end. The second groove segment 312 extends circumferentially along the water-blocking member 300 and one end is connected to the lower end of the first groove segment 311.

[0043] Move the water-blocking component 300 upward so that each limiting protrusion 121 engages in the corresponding first groove 311, and rotate the water-blocking component 300 so that each limiting protrusion 121 engages in the corresponding second groove 312 to perform limiting.

[0044] Specifically, such as Figure 2 , Figure 3 As shown, the limiting protrusions 121 on the inner wall of the dust hood 120 can be formed by stamping, screwing, or bonding, and multiple protrusions are arranged circumferentially around the second conveying pipe 200. The limiting grooves 310 are used to engage with the limiting protrusions 121 for locking or disassembly, achieving quick disassembly and assembly.

[0045] The limiting groove 310 includes a first groove segment 311 and a second groove segment 312. The first groove segment 311 is arranged obliquely upward, and its upper end is inclined towards the direction of the second conveying pipe 200. The second groove segment 312 is arranged circumferentially around the water-blocking member 300, and one end is connected to the lower end of the first groove segment 311.

[0046] In this way, the water-blocking component 300 is moved upward so that each limiting protrusion 121 engages in the corresponding first groove 311, and then the water-blocking component 300 is rotated so that each limiting protrusion 121 engages in the corresponding second groove 312 to achieve limiting and fixation. Disassembly is performed by reversing the operation, which is convenient for disassembly and assembly.

[0047] In some embodiments, the conveying mechanism 100 further includes a telescopic tube 130 and a plurality of adjustment components 140, wherein the lower end of the first conveying tube 110 is connected to the dust hood 120 via the telescopic tube 130.

[0048] The upper end of each adjustment component 140 is connected to the first conveying pipe 110, and the lower end of each adjustment component 140 is connected to the dust suction hood 120 to adjust the length of the telescopic pipe 130.

[0049] Specifically, such as Figure 1 , Figure 5 As shown, since the first conveying pipe 110 is generally rigidly connected to the dust collector, and the lower end of the first conveying pipe 110 is connected to the dust collection hood 120 via a telescopic pipe 130, the installation requirements between the dust collection hood 120 and the second conveying pipe 200 can be met according to the on-site installation requirements. Multiple adjustment components 140 can be evenly distributed around the periphery of the first conveying pipe 110, such as three or more.

[0050] Furthermore, it facilitates adaptive adjustment when the second delivery pipe 200 is not aligned with the first delivery pipe 110, reducing installation requirements. The adjustment component 140 is used to lock the length of the telescopic pipe 130 after it has been adjusted to its correct position, thus maintaining the adjustment position of the dust collection hood 120.

[0051] Furthermore, at least one of the upper and lower ends of the adjusting component 140 has a hook, and at least one of the first delivery pipe 110 and the dust cover 120 has a hook hole 111, with the hook engaging with the corresponding hook hole 111.

[0052] Specifically, such as Figure 5 , Figure 6 As shown, the upper and lower ends of the adjustment component 140 are equipped with hooks, and the lower end of the first conveying pipe 110 and the upper end of the dust cover 120 are equipped with hook holes 111. The upper and lower ends of the adjustment component 140 are respectively hooked to the hook holes 111 through the hooks, which facilitates flexible removal to adjust the water baffle 300 and other components inside the dust cover 120.

[0053] Furthermore, the adjusting assembly 140 includes an upper screw 141, a screw sleeve 142, and a lower screw 143, with the upper screw 141 and the lower screw 143 having opposite thread directions.

[0054] The upper end of the upper screw 141 is connected to the first conveying pipe 110, and the lower end of the upper screw 141 is threadedly connected to the upper end of the screw sleeve 142.

[0055] The upper end of the lower screw 143 is threadedly connected to the lower end of the screw sleeve 142, and the lower end of the lower screw 143 is connected to the dust collection hood 120.

[0056] Specifically, such as Figure 5 As shown, since the upper screw 141 and the lower screw 143 rotate in opposite directions, when the screw sleeve 142 is screwed, the upper screw 141 and the lower screw 143 can be moved closer or further apart, thereby achieving the length adjustment of the extension and retraction. The structure is simple and reliable.

[0057] In some embodiments, the dust control device provided by this utility model further includes: The electrically controlled valve 400 is installed on the pipeline of the first delivery pipe 110.

[0058] The detection component 500 is used to connect to the upper pipeline inside the hopper 10 and to detect the air pressure inside the hopper 10.

[0059] The control components are electrically connected to the solenoid valve 400 and the detection component 500, respectively. When the air pressure is greater than or equal to the upper limit pressure, the solenoid valve 400 is controlled to increase its opening degree; when the air pressure is less than or equal to the lower limit pressure, the solenoid valve 400 is controlled to decrease its opening degree.

[0060] Specifically, the electrically controlled valve 400 can be an electric butterfly valve or an electric gate valve, etc., and the detection element 500 can be a pressure gauge, a pressure transmitter, etc.

[0061] This configuration allows for flexible adjustment of the airflow on the first conveying pipe 110 based on the air pressure within the hopper 10, thereby preventing excessive powder from being drawn away or inadequate dust removal. The detection element 500 is preferably positioned near the feed inlet 11. The specific models, specifications, and locations of the solenoid valve 400, detection element 500, and control elements can be determined according to actual needs; this embodiment does not impose excessive restrictions.

[0062] It should be noted that, considering that it generally takes at least 10 seconds for an electric butterfly valve or electric gate valve to go from fully closed to fully open, and the pressure inside the silo may change suddenly when feeding material, in order to better control the dust pollution generated during the feeding process from the top of the silo, the opening of the electric control valve 400 is opened to 40%-60% before feeding. Then, the opening of the electric control valve 400 is adjusted according to the pressure change inside the silo to avoid dust pollution caused by the electric control valve 400 not responding in time when the feeding amount is too large.

[0063] In addition, the required air volume for dust removal is determined based on the maximum feed rate. The flow velocity in the dust removal pipeline is considered to be 8-20 m / s. The specific flow velocity is determined according to the properties of the dust to avoid dust deposition in the pipeline. The inclination angle of the horizontal pipeline is not less than 10°. If the dust density is high and the weight is relatively heavy, the pipeline flow velocity should be higher. Conversely, a lower flow velocity can be considered.

[0064] Furthermore, in this embodiment, the upper limit pressure is -100Pa and the lower limit pressure is -400Pa. The specific pressure can be selected according to the actual situation on site, with the goal of preventing dust emission.

[0065] In other words, the material hopper 10 must be kept under negative pressure during feeding. When the pressure inside exceeds -100Pa, it indicates that the feeding volume is large and dust will increase, so the opening of the solenoid valve 400 needs to be increased. When the pressure inside is below -400Pa, it indicates that the feeding volume is small and dust will decrease, so the opening of the solenoid valve 400 needs to be decreased.

[0066] Secondly, this utility model embodiment also provides a silo dust removal system, including a silo 10, a dust collector and a dust control device of any of the above embodiments, one end of the first conveying pipe 110 is connected to the dust collector pipeline, and the lower end of the second conveying pipe 200 is connected to the upper pipeline inside the silo 10.

[0067] Specifically, such as Figure 1 As shown, the top of the silo 10 can be arched, and the second conveying pipe 200 is vertically installed at the center of the top of the silo 10 to facilitate dust collection. The inlet 11 can also be located at the top of the silo 10, close to the second conveying pipe 200.

[0068] Therefore, the dust removal system for the silo provided in this embodiment of the present invention, by configuring a dust control device, can, on the one hand, allow the dust suction hood 120 to suck away the dust inside the silo 10 through the second conveying pipe 200, and on the other hand, allow the dust outside the silo 10 to be sucked away through the gap between the second conveying pipe 200 and the dust suction hood 120, thus ensuring the dust removal effect.

[0069] The above description is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of this utility model.

Claims

1. A dust control device for a silo (10), the silo (10) having a feed inlet (11) above it, characterized in that, The dust control device includes: The conveying mechanism (100) includes a first conveying pipe (110) and a dust collection hood (120). One end of the first conveying pipe (110) is connected to a dust collector pipeline, and the other end of the first conveying pipe (110) is connected to the dust collection hood (120) pipeline. The dust collection hood (120) is arranged above the hopper (10) with its opening facing downward and close to the feed inlet (11). The second conveying pipe (200) has its lower end connected to the upper pipe inside the hopper (10). The upper end of the second conveying pipe (200) extends into the dust collection hood (120) and has a preset gap between it and the inner wall of the dust collection hood (120). The area of ​​the lower end of the dust collection hood (120) is 3-6 times the cross-sectional area of ​​the second conveying pipe (200). It also includes a water-blocking element (300) which is disposed around the outer periphery of the second delivery pipe (200) and connected to the inner peripheral wall of the dust collection hood (120) to fill at least part of the preset gap.

2. The dust control device according to claim 1, characterized in that, Along the radial direction of the second conveying pipe (200), the water baffle (300) has a plurality of upper annular channels (301) and a plurality of lower annular channels (302) from the inside to the outside. Each of the upper annular channels (301) is connected to each of the lower annular channels (302), and the upper outlet of each of the upper annular channels (301) and the lower inlet of each of the lower annular channels (302) are inclined toward the second conveying pipe (200).

3. The dust control device according to claim 1, characterized in that, The inner wall of the dust collection hood (120) has at least two limiting protrusions (121), and each of the limiting protrusions (121) is arranged circumferentially around the second delivery pipe (200); The water-blocking member (300) is annular and has at least two limiting grooves (310) on its outer wall, and each of the limiting grooves (310) is arranged circumferentially around the water-blocking member (300). The limiting groove (310) includes a first groove segment (311) and a second groove segment (312) that match the limiting protrusion (121). The first groove segment (311) extends upward and has an open upper end. The second groove segment (312) extends circumferentially along the water baffle (300) and one end is connected to the lower end of the first groove segment (311). Move the water-blocking member (300) upward so that each of the limiting protrusions (121) is engaged in the corresponding first groove segment (311), and rotate the water-blocking member (300) so that each of the limiting protrusions (121) is engaged in the corresponding second groove segment (312) for limiting.

4. The dust control device according to claim 1, characterized in that, The conveying mechanism (100) also includes a telescopic tube (130) and a plurality of adjustment components (140), the lower end of the first conveying tube (110) being connected to the dust collection hood (120) via the telescopic tube (130); The upper end of each of the adjustment components (140) is connected to the first delivery pipe (110), and the lower end of each of the adjustment components (140) is connected to the dust hood (120) to adjust the length of the telescopic pipe (130).

5. The dust control device according to claim 4, characterized in that, At least one of the upper and lower ends of the adjustment component (140) has a hook, and at least one of the first delivery pipe (110) and the dust hood (120) has a hook hole (111), and the hook is engaged with the corresponding hook hole (111).

6. The dust control device according to claim 4, characterized in that, The adjustment assembly (140) includes an upper screw (141), a screw sleeve (142), and a lower screw (143), wherein the threads of the upper screw (141) and the lower screw (143) are opposite in direction; The upper end of the upper screw (141) is connected to the first conveying pipe (110), and the lower end of the upper screw (141) is threadedly connected to the upper end of the screw sleeve (142). The upper end of the lower screw (143) is threadedly connected to the lower end of the screw sleeve (142), and the lower end of the lower screw (143) is connected to the dust collection hood (120).

7. The dust control device according to any one of claims 1 to 6, characterized in that, Also includes: An electrically controlled valve (400) is installed on the pipeline of the first delivery pipe (110); The detection component (500) is used to connect to the upper pipeline inside the silo (10) and to detect the air pressure inside the silo (10); The control element is electrically connected to the solenoid valve (400) and the detection element (500) respectively; when the air pressure is greater than or equal to the upper limit pressure, the solenoid valve (400) is controlled to increase the opening degree, and when the air pressure is less than or equal to the lower limit pressure, the solenoid valve (400) is controlled to decrease the opening degree.

8. The dust control device according to claim 7, characterized in that, The upper limit pressure is -100 Pa, and the lower limit pressure is -400 Pa.

9. A dust removal system for a silo, characterized in that, Includes a silo (10), a dust collector, and a dust control device as described in any one of claims 1 to 8, wherein one end of the first conveying pipe (110) is connected to the dust collector pipeline, and the lower end of the second conveying pipe (200) is connected to the upper pipeline inside the silo (10).

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