Totally enclosed dust collection structure for a low-emission sand processing plant

Abstract

The utility model provides a kind of full-enclosed dust collection structure of low emission sand treatment equipment, belong to low emission sand treatment equipment technical field, this full-enclosed dust collection structure of low emission sand treatment equipment includes collection cover body, sealing connecting piece and deflector plate;The collection cover body is inverted frustum shell structure, the bottom opening edge of the collection cover body extends to form horizontal flange face outward;The sealing connecting piece is fixed in the lower surface of the horizontal flange face, and the sealing connecting piece is annular elastomer structure;The deflector plate is arranged on the side wall inside the collection cover body, and one end of the deflector plate is fixedly connected with the inner wall of the collection cover body by welding mode;It can solve the technical problems that the sand treatment equipment in the prior art lacks reasonable airflow guide design, causing the dust to flow disorderly inside the cover body and deposit in large quantities on the inner wall, resulting in low collection efficiency and dust emission exceeding the standard.

Description

Technical Field

[0001] This utility model belongs to the technical field of low-emission sand treatment equipment, specifically, it relates to a fully enclosed dust collection structure for low-emission sand treatment equipment. Background Technology

[0002] Sand processing equipment is widely used in industries such as casting, glass, and building materials for screening, mixing, and regenerating materials such as quartz sand and molding sand. During operation, the intense collisions and friction between materials and between materials and equipment components generate a large amount of dust particles suspended in the air. This dust not only pollutes the workshop environment and affects worker health but also causes material loss and equipment wear. To control dust emissions, existing technologies typically install dust collection hoods above or on the sides of the sand processing equipment, using fans to draw the dust-laden airflow to a dust collector for filtration. However, existing dust collection devices generally suffer from the following technical defects: the connection between the collection hood and the equipment body is often fixed with rigid flanges and bolts. Due to machining precision and assembly errors, gaps easily exist at the connection, causing dust to leak into the workshop environment. Furthermore, the interior of existing collection hoods is usually a simple conical or cylindrical cavity structure, lacking an effective airflow guiding device. This results in disordered airflow of dust-laden air entering the hood, causing dust particles to easily accumulate on the inner wall of the hood, reducing dust collection efficiency and increasing the workload of equipment maintenance and cleaning. To address the aforementioned issues, existing technologies attempt to improve the sealing performance of connections by adding sealing gaskets. However, ordinary flat gaskets are prone to failure under the influence of equipment vibration and thermal expansion and contraction, and cannot maintain a stable sealing effect over a long period of time. Utility Model Content

[0003] In view of this, the present invention provides a fully enclosed dust collection structure for a low-emission sand treatment device, which can solve the technical problems of existing sand treatment devices generating a large amount of airflow containing quartz sand particles and dust during operation, the lack of an effective fully enclosed dust collection structure, which causes dust to easily leak into the surrounding environment from the connection between the collection device and the equipment body during the collection process, and the lack of a reasonable airflow guidance design inside the collection hood, which causes dust to flow turbulently inside the hood and accumulate in large quantities on the inner wall, resulting in low collection efficiency and excessive dust emissions.

[0004] This utility model is implemented as follows:

[0005] This utility model provides a fully enclosed dust collection structure for a low-emission sand treatment equipment, used to collect dust generated during the operation of the sand treatment equipment. It includes a collection hood, a sealing connector, and a guide plate. The collection hood is an inverted frustum-shaped shell structure, with the bottom opening edge extending outwards to form a horizontal flange. The sealing connector is fixed to the lower surface of the horizontal flange and is an annular elastomer structure. The guide plate is disposed on the side wall inside the collection hood, with one end fixedly connected to the inner wall of the collection hood by welding, and the other end pointing towards the geometric center axis of the collection hood. The guide plate has an arc-shaped curved surface structure, with its concave surface facing the top of the collection hood.

[0006] The technical advantages of the fully enclosed dust collection structure for low-emission sand treatment equipment provided by this utility model are as follows: By adopting an inverted frustum-shaped shell structure for the collection hood and extending outward from the bottom opening edge to form a horizontal flange surface, and fixing the annular elastic structure of the sealing connector to the lower surface of the horizontal flange surface, a fully enclosed coverage of the sand treatment area is achieved. At the same time, the guide plate is set on the inner side wall of the collection hood and has an arc-shaped curved surface structure with one end welded and fixed and the other end pointing to the geometric center axis. This allows the dust to flow upward along the arc-shaped curved surface of the guide plate inside the collection hood and converge to the central area, effectively avoiding the disorderly diffusion and deposition of dust inside the hood, improving dust collection efficiency and reducing dust emissions.

[0007] Based on the above technical solution, the fully enclosed dust collection structure of the low-emission sand treatment equipment of this utility model can be further improved as follows:

[0008] The angle between the generatrix of the frustum-shaped shell structure of the collection hood and the vertical direction is 30-45°.

[0009] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by limiting the angle between the generatrix of the frustum-shaped shell structure of the collection hood and the vertical direction to 30~45°, it ensures that the collection hood has sufficient internal space to accommodate the upward flow of dust airflow, while avoiding the excessive horizontal dimension of the hood due to an excessive cone angle, which would occupy too much equipment installation space. At the same time, this angle range makes the dust particles slide more smoothly on the inner wall of the hood, reducing the adhesion and accumulation of dust on the inner wall, and facilitating subsequent cleaning and maintenance.

[0010] Furthermore, the cross-section of the annular elastomer structure of the sealing connector is in the shape of a hollow rectangular frame, and a closed air cavity space is formed inside the hollow rectangular frame.

[0011] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the cross-section of the annular elastic structure of the sealing connector is in the shape of a hollow rectangular frame and forms a closed air cavity space inside. This allows the sealing connector to generate better buffering and sealing effect through the elastic deformation of the air cavity when subjected to external pressure. This effectively compensates for the fit gap between the equipment body and the collection hood caused by processing errors or thermal expansion and contraction, ensures the airtightness of the connection part, and prevents dust from leaking from the connection point into the external environment.

[0012] Furthermore, three guide plates are evenly distributed along the circumference of the inner wall of the collection hood, and the central angle between each guide plate is 120°.

[0013] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: By uniformly distributing three guide plates along the circumference of the inner wall of the collection hood, with a central angle of 120° between each guide plate, the dust airflow entering the collection hood is guided by the guide plates in three directions to form a uniform spiral upward airflow. This avoids the airflow deflection and local eddy phenomenon that are easy to occur when guiding the flow in one or two directions, and improves the uniformity of dust flow and collection efficiency inside the hood.

[0014] Furthermore, the radius of curvature of the arc-shaped surface structure of the guide plate gradually decreases along the direction from the fixed end to the free end, and the radius of curvature of the fixed end is greater than that of the free end.

[0015] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the radius of curvature of the arc-shaped surface structure of the guide plate gradually decreases along the direction from the fixed end to the free end, so that the dust airflow is subjected to a gradually enhanced centripetal guiding force when flowing along the surface of the guide plate, which makes the dust airflow more effectively converge towards the central axis of the collection hood. At the same time, this variable curvature arc design reduces the separation and turbulence of the airflow on the surface of the guide plate, reduces the airflow resistance and improves the dust conveying efficiency.

[0016] Furthermore, a circular exhaust port is provided at the center of the top of the collection hood, and the ratio of the diameter of the circular exhaust port to the diameter of the bottom opening of the collection hood is 1:5 to 1:8.

[0017] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by opening a circular exhaust port at the center of the top of the collection hood and setting the ratio of its diameter to the diameter of the bottom opening of the collection hood to 1:5 to 1:8, the dust airflow will generate an appropriate increase in flow velocity when it reaches the top of the hood due to the contraction of the outlet area. This is conducive to effectively transporting dust particles to the subsequent dust removal system. At the same time, this ratio range avoids the problems of excessive airflow resistance caused by an exhaust port that is too small or insufficient airflow velocity caused by an exhaust port that is too large.

[0018] Furthermore, the minimum distance between the free end of the guide plate and the geometric center axis of the collection hood is greater than twice the radius of the circular exhaust port.

[0019] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by limiting the minimum distance between the free end of the guide plate and the geometric center axis of the collection hood to more than twice the radius of the circular exhaust port, it is ensured that the dust airflow guided by the guide plate has sufficient diffusion and adjustment space after reaching the central area. This avoids the strong interference and backflow phenomenon generated at the end of the guide plate when the free end of the guide plate is too close to the center axis, and ensures that the dust airflow can smoothly and orderly enter the subsequent treatment system through the exhaust port.

[0020] Furthermore, the thickness of the guide plate gradually decreases along the direction from the fixed end to the free end, and the thickness of the fixed end is 2 to 3 times the thickness of the free end.

[0021] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by gradually thinning the thickness of the guide plate along the direction from the fixed end to the free end, and with the thickness of the fixed end being 2 to 3 times that of the free end, the guide plate has sufficient structural strength at the fixed end to withstand welding stress and airflow impact force. The thinning design at the free end reduces the overall weight of the guide plate and reduces the obstruction to airflow. At the same time, this gradual thickness structure gives the guide plate a better streamlined shape and reduces airflow separation and vortex loss at the edge of the guide plate.

[0022] Furthermore, the collection cover is made of stainless steel sheet by stamping, and the sealing connector is made of silicone rubber material by molding.

[0023] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by making the collection hood from stainless steel sheet by stamping, the hood has good corrosion resistance and mechanical strength, and can withstand the scouring and friction of dust particles for a long time without rusting or deformation. At the same time, the sealing connector is made from silicone rubber material by molding, which gives the seal excellent elasticity and sealing performance, and can maintain a stable sealing effect under temperature changes and mechanical vibration, thus extending the service life of the entire dust collection structure.

[0024] Furthermore, a number of bolt through holes are evenly provided on the horizontal flange surface along the circumferential direction. The number of bolt through holes is 8 to 12, and the diameter of the circular trajectory formed by the line connecting the centers of each bolt through hole is larger than the diameter of the bottom opening of the collection cover.

[0025] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by uniformly opening 8 to 12 bolt through holes along the circumference on the horizontal flange surface, and the diameter of the circular trajectory formed by the line connecting the centers of each bolt through hole is larger than the diameter of the bottom opening of the collection cover, the bolt connection points are distributed in the outer area of ​​the sealing connection, and the resulting clamping force can be applied more evenly to the entire circumference of the sealing connection. This avoids the problem of insufficient clamping on the inner side of the sealing component when the connection point is too close to the center, and ensures that the sealing performance of the connection part is more reliable and uniform.

[0026] Compared with existing technologies, the beneficial effects of the fully enclosed dust collection structure for low-emission sand treatment equipment provided by this utility model are as follows: This utility model, through the design of an inverted frustum-shaped collection hood structure and the outward extension of the bottom opening edge to form a horizontal flange surface, combined with an annular elastic sealing connector fixed to the lower surface of the flange surface, achieves full enclosure coverage of the sand treatment area, effectively preventing dust leakage from the connection points. Simultaneously, a guide plate with an arc-shaped curved surface structure is provided on the inner side wall of the collection hood. One end is welded and fixed to the inner wall of the hood, and the other end points towards the geometric center axis of the hood. The arc-shaped curved surface of the guide plate guides the dust airflow upward along a predetermined trajectory and converges to the central area, avoiding disorderly diffusion and deposition of dust inside the hood. The arc-shaped curved surface structure of the guide plate allows the airflow to adhere closely to the surface of the guide plate during flow, forming a stable wall-attached flow, reducing airflow separation and turbulence, and improving dust transport efficiency. The annular elastomer structure of the sealing connector effectively compensates for the fit gap between the equipment body and the collection hood through the elastic deformation of the internal closed air cavity, ensuring that the connection maintains good airtightness at all times. The entire dust collection structure, through its reasonable geometric design and scientific airflow organization, significantly improves dust collection efficiency, reduces dust emission concentration, improves the working environment of the sand processing equipment, and meets environmental protection requirements. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A schematic diagram of a fully enclosed dust collection structure for a low-emission sand treatment device;

[0029] Figure 2 This is a structural schematic diagram of the sealing connector;

[0030] Figure 3 A schematic diagram of the cross-sectional structure of the collection enclosure;

[0031] The attached diagram lists the components represented by each number as follows:

[0032] 10. Collection hood; 11. Horizontal flange face; 20. Sealing connector; 30. Deflector plate. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0034] like Figure 1-3 The diagram shows a fully enclosed dust collection structure for a low-emission sand treatment device provided by this utility model. The structure, used to collect dust generated during the operation of the sand treatment device, includes a collection hood 10, a sealing connector 20, and a guide plate 30. The collection hood is an inverted frustum-shaped shell structure, with the bottom opening edge extending outwards to form a horizontal flange surface 11. The sealing connector is fixed to the lower surface of the horizontal flange surface and is an annular elastic body structure. The guide plate is located on the side wall inside the collection hood, with one end fixedly connected to the inner wall of the collection hood by welding, and the other end pointing towards the geometric center axis of the collection hood. The guide plate has an arc-shaped curved surface structure, with its concave surface facing the top of the collection hood.

[0035] In the above technical solution, the angle between the generatrix of the frustum-shaped shell structure of the collection hood and the vertical direction is 30~45°.

[0036] Furthermore, in the above technical solution, the cross-section of the annular elastomer structure of the sealing connector is in the shape of a hollow rectangular frame, and a closed air cavity space is formed inside the hollow rectangular frame.

[0037] Furthermore, in the above technical solution, three guide plates are evenly distributed along the circumference of the inner wall of the collection hood, and the central angle between each guide plate is 120°.

[0038] Furthermore, in the above technical solution, the radius of curvature of the arc-shaped surface structure of the guide plate gradually decreases along the direction from the fixed end to the free end, and the radius of curvature of the fixed end is greater than that of the free end.

[0039] Furthermore, in the above technical solution, a circular exhaust port is provided at the top center of the collection hood, and the ratio of the diameter of the circular exhaust port to the diameter of the bottom opening of the collection hood is 1:5 to 1:8.

[0040] Furthermore, in the above technical solution, the minimum distance between the free end of the guide plate and the geometric center axis of the collection hood is greater than twice the radius of the circular exhaust port.

[0041] Furthermore, in the above technical solution, the thickness of the guide plate gradually decreases along the direction from the fixed end to the free end, and the thickness of the fixed end is 2 to 3 times the thickness of the free end.

[0042] Furthermore, in the above technical solution, the collection cover is made of stainless steel sheet by stamping, and the sealing connector is made of silicone rubber material by molding.

[0043] Furthermore, in the above technical solution, a number of bolt through holes are evenly opened along the circumferential direction on the horizontal flange surface. The number of bolt through holes is 8 to 12, and the diameter of the circular trajectory formed by the line connecting the centers of each bolt through hole is larger than the diameter of the bottom opening of the collection hood.

[0044] The following is a specific embodiment 1 of this utility model: This embodiment provides a fully enclosed dust collection structure for a molding sand mixer in a foundry workshop. The collection hood of this structure is made of 304 stainless steel plate with a thickness of 3mm through stamping and welding processes. The overall shape of the hood is an inverted truncated cone. The bottom opening diameter of the hood is 1200mm, the top opening diameter is 200mm, the height of the hood is 800mm, and the angle between the generatrix of the cone and the vertical direction is 38°. The bottom opening edge of the hood extends horizontally outward to form an annular horizontal flange surface with a width of 60mm. Ten bolt through holes with a diameter of 14mm are evenly opened along the circumference on the flange surface, and the line connecting the centers of each bolt through hole forms a circular trajectory with a diameter of 1300mm. The sealing connector is made of silicone rubber with a hardness of 60 Shore A, molded and vulcanized. It has an overall annular structure with an outer diameter of 1350mm and an inner diameter of 1150mm, and a hollow rectangular frame cross-section. The frame's external dimensions are 100mm wide and 40mm high, with a wall thickness of 8mm, forming a closed rectangular air cavity inside. The guide vanes are made of 2mm thick 304 stainless steel sheet. Each guide vane has a fan-shaped planar projection with a central angle of 40 degrees and a radial length of 350mm. Three guide vanes are evenly distributed along the circumference of the inner wall of the collection hood, with a central angle of 120° between each vane. The fixed end of each guide vane is welded to the inner wall of the hood by argon arc welding, with the welding position 150mm above the bottom opening edge of the hood. The guide vane has an arc-shaped curved surface structure, with the concave side facing the top of the shroud. The radius of curvature at the fixed end of the guide vane is 600mm, and the radius of curvature at the free end is 300mm, with the radius of curvature decreasing linearly from the fixed end to the free end. The thickness of the guide vane is 6mm at the fixed end and 2mm at the free end, with a uniform transition in thickness along its length. The minimum distance between the free end of the guide vane and the geometric center axis of the shroud is 250mm. The collection shroud is secured to the horizontal flange face of the sand mixer body with 10 M12 hexagonal head bolts. The bolt tightening torque is 80 Nm, which subjects the annular elastic structure of the sealing connection to a uniform compressive force, causing elastic compression deformation of the air cavity and forming an effective sealing band with a width of 95mm between the sealing element and the contact surface.

[0045] The following is another specific embodiment 2 of this utility model: Embodiment 2 is based on Embodiment 1, in which a 0.5mm thick polytetrafluoroethylene (PTFE) coating is sprayed onto the inner wall surface of the collecting hood. This coating has excellent non-stick properties and a low coefficient of friction, with a surface friction coefficient less than 0.1. By spraying the PTFE coating onto the inner wall of the hood, the adhesion of dust particles to the inner wall is significantly reduced. Under the action of gravity and airflow shear force, dust is more likely to slide off the inner wall without accumulating, reducing the amount of dust deposited on the inner wall of the hood. Simultaneously, the smooth surface of the PTFE coating reduces the frictional resistance between the airflow and the inner wall of the hood, improving airflow efficiency. The PTFE coating also has good chemical corrosion resistance and wear resistance, resisting long-term erosion and friction from dust particles, extending the service life of the collecting hood.

[0046] The following is another specific embodiment 3 of this utility model: Embodiment 3 is based on Embodiment 1, with several triangular protrusions arranged circumferentially on the outer wall of the annular elastic structure of the sealing connector. The height of each protrusion is 5mm, the width of its base is 10mm, and the distance between adjacent protrusions is 30mm. When the sealing connector is subjected to clamping force, these triangular protrusions first contact the contact surface. Due to the geometry of the protrusions, the contact pressure is concentrated in the tip area, generating a large local compressive stress, causing the protrusions to deform preferentially and expand outwards, forming multiple independent sealing lines. The arrangement of multiple sealing lines provides multiple sealing guarantees. Even if a certain sealing line experiences local leakage due to surface unevenness, the other sealing lines can still maintain the sealing effect, significantly improving the sealing reliability of the connection. The triangular protrusions also increase the effective sealing length of the sealing connector and improve its adaptability to surface unevenness.

[0047] Specifically, the principle of this utility model is as follows: The dust collection structure of this utility model adopts an inverted frustum-shaped collection hood combined with an arc-shaped guide plate, realizing the effective collection and guidance of dust airflow. The frustum-shaped structure of the collection hood gives it a tapered shape, smaller at the top and larger at the bottom. When the dust-laden airflow enters from the bottom opening of the hood, it is constrained by the conical inner wall, and the cross-sectional area of ​​the airflow gradually decreases. According to the principle of fluid continuity, the airflow velocity increases accordingly, which is beneficial to the transport of dust particles. The horizontal flange surface formed by the outward extension of the bottom opening edge of the hood provides a reliable mounting base for the sealing connector. After the sealing connector is fixed to the lower surface of the flange surface, it forms a pressing contact with the upper surface of the equipment body, realizing the airtight seal of the connection. The sealing connector adopts an annular elastic structure with a hollow rectangular frame cross-section. Its internal closed air cavity can generate elastic deformation when subjected to compressive force, so that the sealing component and the contact surface form a larger contact area and a more uniform distribution of compressive force, effectively compensating for the unevenness of the contact surface and the fit gap, ensuring the sealing reliability of the connection. The guide vanes are installed on the inner sidewall of the collection hood, with the concave surface of their arc-shaped curved structure facing the top of the hood. When the dust-laden airflow flows upward along the inner wall of the hood, it is guided by the arc-shaped surface of the guide vanes, causing the airflow to deflect along the arc towards the central axis of the hood. The combined effect of multiple guide vanes creates a spiral upward flow pattern inside the hood, carrying dust particles upward and ultimately converging them at the exhaust port at the top center of the hood. The arc-shaped curved structure of the guide vanes allows the airflow to flow smoothly along the curved surface without significant separation or eddies, reducing airflow resistance loss and improving dust conveying efficiency.

[0048] When installing this dust collection structure on the sand processing equipment, first place the collection hood above the material processing area of ​​the sand processing equipment, aligning the horizontal flange face at the bottom of the hood with the installation plane of the equipment body. Then, place the annular elastic structure of the sealing connector between the horizontal flange face and the equipment body, and tighten the bolts through the bolt holes on the horizontal flange face. This causes the sealing connector to undergo elastic deformation under the pressure and fit tightly against the contact surface, forming a reliable airtight seal. After installation, connect the circular exhaust port at the top of the collection hood to the fan inlet of the dust removal system through a pipe. When the sand processing equipment starts working, the dust particles generated during the material processing enter the collection hood through the opening at the bottom of the hood. After the dust removal system's fan starts, a negative pressure is formed inside the hood. The dust-laden airflow flows upward under the action of the negative pressure. After the airflow encounters the guide plates on the inner wall of the hood, it is guided by the arc-shaped curved surface and deflected towards the central axis of the hood. The combined guiding effect of the three guide plates causes the airflow to form a spiral upward flow pattern inside the hood. The dust particles are transported upward with the airflow and finally enter the pipeline system through the circular exhaust port at the top of the hood and are transported to the dust collector for filtration.

Claims

1. A fully enclosed dust collection structure for a low-emission sand treatment equipment, used to collect dust generated during the operation of the sand treatment equipment, comprising a collection hood, sealing connectors, and a guide plate; wherein the collection hood is an inverted frustum-shaped shell structure, and the bottom opening edge of the collection hood extends outward to form a horizontal flange surface; characterized in that, The sealing connector is fixed to the lower surface of the horizontal flange and is an annular elastomer structure. The guide plate is disposed on the side wall inside the collection hood. One end of the guide plate is fixedly connected to the inner wall of the collection hood by welding, and the other end of the guide plate points towards the geometric center axis of the collection hood. The guide plate has an arc-shaped curved surface structure, and the concave surface of the guide plate faces the top of the collection hood.

2. The fully enclosed dust collection structure for a low-emission sand treatment equipment according to claim 1, characterized in that, The angle between the generatrix of the frustum-shaped shell structure of the collection hood and the vertical direction is 30~45°.

3. The fully enclosed dust collection structure for a low-emission sand treatment device according to claim 2, characterized in that, The cross-section of the annular elastomer structure of the sealing connector is in the shape of a hollow rectangular frame, and the interior of the hollow rectangular frame forms a closed air cavity space.

4. The fully enclosed dust collection structure for a low-emission sand treatment equipment according to claim 3, characterized in that, Three guide plates are evenly distributed along the circumference of the inner wall of the collection hood, and the central angle between each guide plate is 120°.

5. The fully enclosed dust collection structure for a low-emission sand treatment equipment according to claim 4, characterized in that, The radius of curvature of the arc-shaped surface structure of the guide plate gradually decreases from the fixed end to the free end, and the radius of curvature of the fixed end is greater than that of the free end.

6. The fully enclosed dust collection structure for a low-emission sand treatment equipment according to claim 5, characterized in that, A circular vent is provided at the center of the top of the collection hood, and the ratio of the diameter of the circular vent to the diameter of the bottom opening of the collection hood is 1:5 to 1:

8.

7. The fully enclosed dust collection structure for a low-emission sand treatment equipment according to claim 6, characterized in that, The minimum distance between the free end of the guide plate and the geometric center axis of the collection hood is greater than twice the radius of the circular exhaust port.

8. The fully enclosed dust collection structure for a low-emission sand treatment equipment according to claim 7, characterized in that, The thickness of the guide plate gradually decreases from the fixed end to the free end, and the thickness of the fixed end is 2 to 3 times the thickness of the free end.

9. The fully enclosed dust collection structure for a low-emission sand treatment device according to claim 8, characterized in that, The collection cover is made of stainless steel sheet by stamping, and the sealing connector is made of silicone rubber material by molding.

10. The fully enclosed dust collection structure for a low-emission sand treatment device according to claim 9, characterized in that, The horizontal flange surface is provided with a number of bolt through holes evenly distributed along the circumference. The number of bolt through holes is 8 to 12. The diameter of the circular trajectory formed by connecting the centers of each bolt through hole is larger than the diameter of the bottom opening of the collection cover.

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