Local dust suction device for belt conveyor section

Abstract

The utility model belongs to but is not limited to dust removal technical field, especially the local airtight dust collection device of belt conveying section more particularly relates to a kind of, including closed casing, suction port, dust collection groove and material return mechanism, specific structure is as follows: closed casing: cover is located in the local area of belt conveying section, for closing the area to break out dust overflow path;Suction port: set in the top or side wall of closed casing, with the negative pressure side of fan through pipeline connection;When working, fan generates negative pressure, dust-containing air in closed casing is inhaled through suction port, realizes dust capture;Dust collection groove: set in the below of closed casing interior, with belt conveying direction parallel or certain angle inclination, for receiving and temporarily storing dust separated from air;Material return mechanism: for dust in dust collection groove is sent back to main material flow, realizes dust recycling.

Description

Technical Field

[0001] This utility model belongs to, but is not limited to, the field of dust removal technology, and particularly relates to a partially enclosed dust collection device for a belt conveyor section. Background Technology

[0002] In modern industrial production systems, belt conveyors, as a continuous and efficient material transport method, are widely used in various fields such as mining, chemical industry, building materials, grain processing, and metallurgy. For example, in the mining industry, belt conveyors are used for long-distance transportation of coal and ore; in the chemical industry, they are used for transporting fertilizers and chemical raw materials; in the building materials industry, they are used for the circulation of cement and aggregates; and in the grain processing industry, they are used for handling grains and miscellaneous grains. The materials being transported are mostly powdery, granular, or semi-fluid, such as coal powder, cement powder, fine ore powder, and grain particles. During the belt conveying process, they are easily affected by factors such as material impact, belt vibration, material friction, and airflow disturbance, which can easily generate a large amount of dust.

[0003] From the perspective of specific scenarios where dust is generated, when materials are unloaded from the silo onto the conveyor belt, the impact caused by the drop will cause the material particles to mix violently with the air, forming an initial dust cloud. During the operation of the conveyor belt, its own vibration and the friction between the material and the belt, and between materials themselves, will cause fine particles to be continuously separated from the main material, resulting in continuous dust emission. In addition, changes in the flow direction of materials in areas such as bends and transfer points of the conveyor belt will also exacerbate the dust emission.

[0004] The large-scale generation of this dust has brought about serious harm in multiple dimensions:

[0005] Environmental hazards: Dust permeates the production workshop and surrounding areas, causing a sharp decline in air quality, damaging the ecological environment of the factory area, and may even spread to surrounding residential areas, causing environmental disputes.

[0006] Health hazards: When workers are exposed to dusty environments for a long time, dust particles (especially inhalable dust with a particle size of less than 5μm) can penetrate deep into the respiratory tract and even the lungs, causing respiratory diseases such as pneumoconiosis, bronchitis, and emphysema, which seriously threaten their health.

[0007] Safety hazards: When the dust concentration in the air reaches a certain level, it can easily cause a dust explosion when it comes into contact with a source of ignition, resulting in serious casualties and property damage.

[0008] Economic harm: The large-scale escape of dust means direct loss of materials and increases the cost of raw material procurement; at the same time, in order to control dust, enterprises need to invest a lot of money in the purchase, operation and maintenance of dust removal equipment, which further increases the economic burden.

[0009] To address the dust pollution problem in belt conveyor sections, various dust collection devices have emerged in the industry. However, these devices have significant shortcomings in terms of airtightness, dust recovery efficiency, ease of equipment maintenance, and adaptability to different scenarios, making it difficult to meet the demands of modern industry for efficient, environmentally friendly, and low-cost dust control. Therefore, developing a technology capable of localized, enclosed dust collection in belt conveyor sections, achieving efficient dust recovery, and facilitating equipment maintenance and installation has become a critical issue urgently needing to be addressed in industrial production.

[0010] 1. Existing technology 1: CN113877309B (A dust removal and treatment device for a belt conveyor)

[0011] Technical Content: This technical solution includes a dust hood, a dust collection device, an airflow channel, and a dust removal device, designed to extract and treat dust generated during the operation of a belt conveyor. The description indicates that while the current device has a simple structure and is easy to install, it still has limitations in handling dust from materials of different particle sizes and moisture levels, as well as addressing the impact of belt conveyor maintenance.

[0012] Existing technical problems:

[0013] The overall design consists of a cover and a dust removal device, but it does not have a specific enclosed design for certain areas of the belt conveyor section (such as the return section of the conveyor belt, the inclined section, etc.).

[0014] For dust or particles generated by materials with high moisture content and strong adhesion, the suction and treatment efficiency is still not high.

[0015] When installed in a long conveyor belt system, the local dust removal device is inconvenient to inspect and maintain, and has poor layout flexibility.

[0016] 2. Existing technology two: CN202953522U (A dust collection system for the material drop point of a belt conveyor)

[0017] Technical details: This system is specifically designed for dust collection at the material drop point ("drop point") of belt conveyors, and includes a material trough, air return pipe, dust collection hood, and sealed cover. It employs a drop point hood + return air duct + dust collection equipment configuration to achieve dust collection and re-transportation.

[0018] Existing technical problems:

[0019] Although it covers dust at the "material drop point", its effective area is limited to the material drop point and does not cover the dust generated during the operation of the conveyor belt (such as the conveying section, intermediate section, and return section).

[0020] Although the cover and airflow return pipe work together, their overall airtightness and ability to block dust escape paths are limited.

[0021] The design of the material / dust re-conveying structure after dust collection is relatively simple, and the efficiency of material recycling and separation is not fully realized.

[0022] Although there are already many conveyor belt dust removal structures or cover structures, none of them have systematically laid out the combined structure of "local closed dust collection in the belt conveyor section (including cover, air inlet, dust collection trough, and return material mechanism)". Furthermore, there are still technical gaps in terms of installation flexibility, sealing effect, dust separation / recycling, and ease of maintenance. Utility Model Content

[0023] To address the problems existing in the prior art, this utility model provides a partially enclosed dust collection device for belt conveyor sections.

[0024] This utility model is implemented as follows: a partially enclosed dust collection device for a belt conveyor section includes a sealed cover, an air inlet, a dust collection trough, and a material return mechanism, with the specific structure as follows:

[0025] Enclosed enclosure: Installed over a localized area of ​​the belt conveyor section to seal off the area and block dust escape paths. It is made of steel plate or flame-retardant plastic and has good airtightness and structural strength.

[0026] Air intake: Located on the top or side wall of the enclosed enclosure, it is connected to the negative pressure side of the fan via a pipe. During operation, the fan generates negative pressure, drawing in dust-laden air from inside the enclosed enclosure through the air intake, thus capturing dust.

[0027] Dust collection trough: Located at the bottom inside the enclosed enclosure, parallel to the direction of belt conveyor or inclined at a certain angle, it is used to receive and temporarily store dust separated from the air.

[0028] Return mechanism: Used to return the dust in the dust collection trough to the main material flow, so as to realize the recycling of dust.

[0029] Furthermore, both the inlet and outlet ends of the enclosed housing are equipped with flexible sealing elements, which are rubber curtains with their lower ends hanging down to the surface of the belt to form a flexible barrier to prevent dust from overflowing from the inlet and outlet. Air curtain devices, including airflow nozzles, are installed at the inlet and outlet ends of the enclosed housing to form an air curtain by spraying out uniform airflow, thereby preventing dust from overflowing from the airflow level.

[0030] Furthermore, the bottom of the dust collection trough is equipped with a detachable dust removal structure, which is either a drawer-type dust removal box or a dust removal door panel connected by a flange. When there is a large amount of accumulated dust, the dust in the dust collection trough can be quickly cleaned by removing the dust removal box or the dust removal door panel.

[0031] Furthermore, the material return mechanism can employ a belt conveyor, a screw conveyor, or a pneumatic conveyor.

[0032] If a screw conveyor is used, its feed end is connected to the discharge port at the bottom of the dust collection trough, and the discharge end extends above the material flow of the main belt. The dust is transported back to the main material flow by the rotation of the screw blades.

[0033] If a pneumatic return conveying device is used, the airflow generated by the fan will transport the dust in the dust collection tank to the main material flow area through the pipeline, and the dust return will be achieved by means of airflow power, ensuring the continuity of dust return.

[0034] Furthermore, the enclosed housing adopts a modular structure, consisting of multiple housing modules that are detachably connected by bolts. Simultaneously, the air intake and dust collection tank also employ a modular design, allowing for flexible combination of modules based on the actual belt length and structure.

[0035] Based on the above technical solutions and the technical problems solved, the advantages and positive effects of the technical solution to be protected by this utility model are as follows:

[0036] The partially enclosed dust collection device for belt conveyor sections of this invention has the following beneficial effects:

[0037] Excellent airtightness: By combining a closed casing with flexible seals or air curtain devices, dust leakage is blocked from both the physical structure and the air curtain level, effectively improving the working environment.

[0038] Highly efficient dust recovery: After dust is captured in the dust collection tank, it is directly returned to the main material flow through the return material mechanism, avoiding material waste and improving resource utilization.

[0039] Easy maintenance: The detachable dust removal structure at the bottom of the dust collection trough facilitates regular cleaning of accumulated dust; the modular design makes the device flexible in installation and replacement, and can quickly adapt to the transformation needs of different belt conveyor scenarios.

[0040] This device effectively controls dust in the belt conveyor section while also enabling dust recycling. It also has good maintainability and adaptability, making it highly practical. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of a partially enclosed dust collection device for a belt conveyor section provided in an embodiment of this utility model;

[0042] Figure 2 This is a schematic diagram of the enclosed cover provided in an embodiment of the present utility model;

[0043] Figure 3 This is a schematic diagram of the dust collection tank provided in an embodiment of the present utility model;

[0044] Figure 4 This is a schematic diagram of the material return mechanism provided in an embodiment of this utility model;

[0045] 1. Enclosed casing; 2. Air intake; 3. Dust collection trough; 4. Material return mechanism. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0047] like Figure 1 As shown in the figure, the partially enclosed dust collection device for the belt conveyor section provided in this embodiment of the present invention includes a closed cover 1, an air inlet 2, a dust collection trough 3, and a material return mechanism 4, the specific structure of which is as follows:

[0048] like Figure 2 As shown, the enclosed enclosure 1 is installed over a localized area of ​​the belt conveyor section to seal off the area and block the path of dust spillage. It is made of steel plate or flame-retardant plastic and has good airtightness and structural strength.

[0049] Air intake 2: Located on the top or side wall of the enclosed housing 1, and connected to the negative pressure side of the fan via a pipe. During operation, the fan generates negative pressure, drawing in dust-laden air from inside the enclosed housing 1 through air intake 2, thus capturing dust.

[0050] like Figure 3 As shown, the dust collection trough 3 is located below the inside of the enclosed cover 1, parallel to the belt conveying direction or inclined at a certain angle, and is used to receive and temporarily store dust separated from the air.

[0051] The enclosed enclosure 1 is installed in the dust-prone area of ​​the belt conveyor section and is bolted to the belt conveyor support to form a locally sealed space. The internal space of the enclosed enclosure 1 is aligned with the belt's running direction, with a gap at the bottom for material passage and the top connected to the suction port 2. It is made of steel plate or flame-retardant plastic material, with a smooth inner wall and tight sealing, effectively preventing dust from escaping and spreading during the conveying process.

[0052] The suction port 2 is located above or on the side wall of the enclosed casing 1 and is connected to an external negative pressure fan via a flange pipe. During operation, the fan generates negative pressure, drawing the dust-laden gas inside the casing 1 out through the suction port 2, forming a stable airflow channel. A guide plate is installed inside the suction port 2 to evenly distribute the airflow velocity, creating a uniform negative pressure field inside the casing, thereby enabling timely capture and transport of dust.

[0053] The dust collection trough 3 is located at the bottom of the enclosed casing 1, arranged parallel to the belt conveyor direction, and fixed to the conveyor frame by a support frame. Its opening faces upwards to collect dust particles that settle due to airflow separation. The bottom of the dust collection trough 3 has a drawer-type pull-out structure for easy manual periodic cleaning. This structure achieves both gravity settling and gas-solid separation under the action of airflow.

[0054] The return material mechanism 4 is located at the tail end or outlet of the enclosed casing 1, forming a material return channel with the end of the belt. When some material is sucked up by the airflow, the return material mechanism 4 can guide it back onto the belt, realizing material recycling. The entire device achieves efficient dust removal and material recovery in local areas of the belt conveyor section through the synergistic effect of the sealed casing 1, the negative pressure adsorption of the suction port 2, the sedimentation collection of the dust collection trough 3, and the re-transportation function of the return material mechanism 4, ensuring a clean conveying environment and reducing dust escape.

[0055] like Figure 4 As shown, the return material mechanism 4 is used to return the dust in the dust collection tank 3 to the main material flow to realize dust recycling.

[0056] To improve airtightness, both the inlet and outlet ends of the enclosed housing 1 are equipped with flexible sealing elements, which are rubber curtains with their lower ends hanging down to the surface of the belt to form a flexible barrier to prevent dust from overflowing from the inlet and outlet; or, an air curtain device is installed at the inlet and outlet ends of the enclosed housing 1. This device includes airflow nozzles, which spray out uniform airflow to form an air curtain to prevent dust from overflowing from the airflow level.

[0057] To facilitate dust removal and maintenance, the bottom of the dust collection trough 3 is equipped with a detachable dust removal structure, which is either a drawer-type dust removal box or a dust removal door panel connected by a flange. When there is a large amount of accumulated dust, the dust in the dust collection trough 3 can be quickly cleaned by disassembling the dust removal box or the dust removal door panel, ensuring the continuous and efficient operation of the device.

[0058] The return mechanism 4 can be a belt conveyor, a screw conveyor, or a pneumatic conveyor.

[0059] If a screw conveyor is used, its feed end is connected to the discharge port at the bottom of the dust collection trough 3, and the discharge end extends above the material flow of the main belt. The dust is transported back to the main material flow by the rotation of the screw blades.

[0060] If a pneumatic return conveying device is used, the airflow generated by the fan will transport the dust in the dust collection tank 3 to the main material flow area through the pipeline, and the dust return will be achieved by means of airflow power, ensuring the continuity of dust return.

[0061] To accommodate the installation requirements of different belt sections, the enclosed housing 1 adopts a modular structure, consisting of multiple housing modules that are detachably connected by bolts. Similarly, the air intake 2 and dust collection trough 3 also adopt a modular design. Each module can be flexibly combined according to the actual belt length and structure, facilitating installation, replacement, and subsequent maintenance.

[0062] Technical principle of partial closed dust collection device for belt conveyor section

[0063] (1) Principle of local sealing and dust confinement: The local area of ​​the belt conveyor section is completely covered by the enclosed cover 1 to form a relatively closed space. This design uses the principle of "physical barrier" to block the diffusion path of dust to the external environment, so that the dust is confined inside the cover, creating the preconditions for subsequent negative pressure dust collection.

[0064] To further enhance airtightness, flexible seals (such as rubber curtains) or air curtains are installed at the inlet and outlet of the enclosure.

[0065] Flexible sealing eliminates gaps at the inlet and outlet by physically blocking the rubber curtain and using its flexible fit to the belt surface, thus preventing dust from escaping from a structural level.

[0066] The air curtain forms a "wind wall" by spraying uniform airflow from the airflow nozzles, which blocks dust from penetrating the inlet and outlet from a hydrodynamic perspective, providing double protection for the sealed negative pressure environment inside the enclosure.

[0067] (2) Principle of negative pressure suction and dust capture: The suction port 2 is connected to the negative pressure side of the fan. When the fan is running, a negative pressure field is formed inside the casing. According to the principle of "negative pressure diversion" in fluid mechanics, the dust-laden air inside the casing will be forced into the pipeline through the suction port 2 under the action of pressure difference, realizing the transfer of dust from the air to the collection device. In this process, the flow of air becomes the driving force for the movement of dust, ensuring that the dust inside the casing is captured efficiently.

[0068] (3) Gravity settling and dust separation principle: After the dust-laden air enters the casing, the flow velocity decreases due to the expansion of the space. According to the principle of gravity settling, dust particles (especially larger particles) will separate from the dust-laden air and settle into the dust collection tank 3 below because their own weight is greater than the buoyancy of the air. The inclined or horizontal design of the dust collection tank 3 further utilizes the gravitational potential energy of the dust, causing it to accumulate in the tank, creating conditions for subsequent return or cleaning.

[0069] (4) Dust return and resource recovery principle: The return mechanism 4 returns the dust in the dust collection tank 3 to the main material flow through different mechanical or pneumatic methods:

[0070] If a belt / screw conveyor is used, the mechanical transmission thrust (the friction of the belt and the squeezing force of the screw blades) is used to push the dust along a specific path to the main material flow, thus realizing mechanically driven material return.

[0071] If a pneumatic return conveying device is used, the dust is transported through pipelines to the main material flow area by means of the power of the airflow (the air pressure generated by the fan), and the return conveying is completed by utilizing the carrying capacity of the airflow.

[0072] This process enables the recycling of dust and avoids material waste.

[0073] (5) Maintenance optimization and modular adaptation principle: The detachable dust removal structure (drawer-type dust removal box, flange dust removal door) utilizes the detachability of mechanical connection to make the dust collection trough 3 simple and convenient to clean up the accumulated dust, and avoid the continuous operation of the device due to dust blockage.

[0074] The modular structure, through the bolted connection of multiple functional modules, can be flexibly assembled or replaced according to the length and structure of the belt conveyor section, adapting to the installation and maintenance needs of different scenarios and improving the versatility and scalability of the device.

[0075] Example 1: A partially enclosed dust collection device for the belt conveyor section with flexible sealing, a spiral return mechanism 4, and a drawer-type dust removal system.

[0076] The specific structure of the partially enclosed dust collection device for the belt conveyor section in this embodiment is as follows:

[0077] Enclosed Casing 1: Made of 3mm thick cold-rolled steel plate, it covers the material drop area of ​​the belt conveyor section. Both its inlet and outlet ends are equipped with rubber curtain flexible seals, with the lower end of the rubber curtain hanging down to the belt surface (2-5mm away from the belt surface), forming a flexible and airtight barrier.

[0078] Air intake 2: Located at the top center of the enclosed casing 1, it is connected to the negative pressure side of the external fan through a DN100 galvanized pipe.

[0079] Dust collection trough 3: Located inside the lower part of the enclosed cover 1, it is arranged at a 30° angle and the trough body is made of stainless steel. The bottom of the trough is equipped with a drawer-type dust removal box, which is slidably connected to the dust collection trough 3 via guide rails and can be pulled out from the side of the cover to clean the accumulated dust.

[0080] Return mechanism 4: adopts a screw conveyor. The feed end of the device is connected to the discharge port of the dust collection tank 3 through a flange. The screw blades are made of stainless steel with a pitch of 100mm. The discharge end extends above the material flow of the main belt, and the dust is screw-conveyed back to the main material flow.

[0081] Working process: When the belt conveyor transports materials, the dust generated by the falling material is sealed inside the enclosed cover 1. The fan generates negative pressure through the air intake 2 to draw in the dust-laden air. The dust settles in the dust collection trough 3 and accumulates in the drawer-type dust removal box (the dust removal box is periodically removed for cleaning). The dust in the dust collection trough 3 is continuously transported back to the main material flow through the screw conveyor device, realizing the closed collection and recycling of dust.

[0082] Example 2: Partially enclosed dust collection device for the belt conveyor section of an air curtain + pneumatic material return mechanism 4 + flange dust removal door panel

[0083] The specific structure of the partially enclosed dust collection device for the belt conveyor section in this embodiment is as follows:

[0084] Enclosed Casing 1: Constructed from flame-retardant plastic sheets, it covers the transfer area of ​​the belt conveyor section. Both its inlet and outlet ends are equipped with air curtain devices, which include airflow nozzles arranged along the edges of the inlet and outlet of the casing. The airflow from the nozzles forms a continuous air curtain, preventing dust from escaping.

[0085] Air intake 2: Located on the upper side wall of the enclosed casing 1, and connected to the negative pressure side of the fan via a DN80 PVC pipe.

[0086] Dust collection trough 3: Located inside the lower part of the enclosed casing 1, horizontally arranged, and made of carbon steel. Its bottom is equipped with a dust removal door panel connected to a flange, which is bolted to the flange of the dust collection trough 3. After disassembly, the accumulated dust in the trough can be cleaned directly.

[0087] Material return mechanism 4: adopts a pneumatic return device, including a conveying pipe and an auxiliary fan. One end of the conveying pipe is connected to the discharge port of the dust collection trough 3, and the other end extends above the material flow of the main belt; the auxiliary fan (wind pressure 5kPa) provides power for the airflow, and transports the dust in the dust collection trough 3 back to the main material flow through the airflow.

[0088] Working process: When the conveyor belt generates dust, the airflow from the air curtain device forms an air curtain, which, together with the enclosed cover 1, achieves area sealing; the fan draws in the dust-laden air through the suction port 2, and the dust settles in the dust collection tank 3 (the flange is periodically disassembled for cleaning). Then, the dust is transported back to the main material flow by the airflow power of the pneumatic return conveyor device, thus completing the collection and recycling of dust.

[0089] Example 3: Modular structure + belt return mechanism 4 + flexible sealed belt conveyor section local enclosed dust collection device

[0090] The specific structure of the partially enclosed dust collection device for the belt conveyor section in this embodiment is as follows:

[0091] Enclosed Casing 1: Adopting a modular structure, it consists of three detachable casing modules connected by bolts (each module is 1.5m long). The casing modules are made of aluminum alloy sheet, which is lightweight and high-strength. Both the inlet and outlet ends are equipped with rubber curtain-type flexible seals. The rubber curtains are made of wear-resistant neoprene rubber, and their lower ends are attached to the surface of the conveyor belt.

[0092] Air intake 2: Each housing module has an air intake 2 on its top. Multiple air intakes 2 are connected to the negative pressure side of the main fan through branch pipes. The number of air intakes 2 that can be used can be flexibly selected according to the belt length.

[0093] Dust collection trough 3: Located inside the lower part of each cover module, corresponding to each module, arranged horizontally, and the trough body is made of plastic.

[0094] Material return mechanism 4: adopts a belt return device. The return belt of the device is arranged in parallel with the main conveyor belt. The feed end of the return belt is connected to the discharge port of the dust collection trough 3, and the discharge end overlaps with the material flow area of ​​the main belt. The dust is returned to the main material flow through belt drive.

[0095] Working process: According to the length of the belt conveyor section, select the appropriate number of cover modules for assembly to form a suitable closed cover 1; the dust generated by the belt conveyor material is sealed by the modular cover, the fan draws the dust-laden air through the air intake 2, and after the dust settles in the dust collection trough 3, it is continuously returned to the main material flow by the belt return device; if a module is damaged, it can be disassembled and replaced individually, making maintenance convenient.

[0096] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and 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, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0097] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any modifications, equivalent substitutions and improvements made by those skilled in the art within the technical scope disclosed in this utility model, and within the spirit and principles of this utility model, should be included within the protection scope of this utility model.

Claims

1. A partially enclosed dust collection device for a belt conveyor section, characterized in that, It includes a sealed enclosure, air intake, dust collection trough, and material return mechanism, with the following specific structure: Enclosed enclosure: A cover installed over a local area of ​​the belt conveyor section to seal off the area and block the path of dust spillage; Air intake: Located on the top or side wall of the enclosed enclosure, and connected to the negative pressure side of the fan through a pipe; during operation, the fan generates negative pressure, and draws in dust-laden air from inside the enclosed enclosure through the air intake to achieve dust capture; Dust collection trough: Located at the bottom inside the enclosed enclosure, parallel to the direction of belt conveyor or inclined at a certain angle, used to receive and temporarily store dust separated from the air; Return mechanism: Used to return the dust in the dust collection trough to the main material flow.

2. The partially enclosed dust collection device for the belt conveyor section as described in claim 1, characterized in that, Both the inlet and outlet ends of the enclosed housing are equipped with flexible sealing elements, which are rubber curtains with their lower ends hanging down to the surface of the belt to form a flexible barrier to prevent dust from overflowing from the inlet and outlet. Air curtain devices, including airflow nozzles, are installed at the inlet and outlet ends of the enclosed housing to form an air curtain by spraying out uniform airflow, thereby preventing dust from overflowing from the airflow level.

3. The partially enclosed dust collection device for the belt conveyor section as described in claim 1, characterized in that, The bottom of the dust collection trough is equipped with a detachable dust removal structure, which is a drawer-type dust removal box or a dust removal door panel connected by a flange. When there is a lot of dust accumulation, the dust in the dust collection trough can be quickly cleaned by removing the dust removal box or the dust removal door panel.

4. The partially enclosed dust collection device for the belt conveyor section as described in claim 1, characterized in that, The material return mechanism can be a belt conveyor, a screw conveyor, or a pneumatic conveyor. If a screw conveyor is used, its feed end is connected to the discharge port at the bottom of the dust collection trough, and the discharge end extends above the material flow of the main belt. The dust is transported back to the main material flow by the rotation of the screw blades. If a pneumatic conveying device is used, the airflow generated by the fan will transport the dust in the dust collection tank to the main material flow area through the pipeline.

5. The partially enclosed dust collection device for the belt conveyor section as described in claim 1, characterized in that, The enclosed enclosure adopts a modular structure, consisting of multiple enclosure modules that can be detachably connected by bolts; at the same time, the air intake and dust collection tank also adopt a modular design.

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