Drying material conveying device

Abstract

The utility model provides a kind of drying material conveying device, comprising: the box for forming closed conveying space, the feed inlet being equipped in one side of box, the discharge outlet being equipped in the other side of box, the conveying device being equipped in the box, the several hoppers being equipped on the conveying device;Further comprising: the air supply device being equipped on the upper end of feed inlet and being fixed on the side wall of box, the air suction device being equipped in the top of box, the contact of drying material and air is greatly reduced by airtight box, the risk of moisture absorption is significantly reduced, and the stability of water content is guaranteed;Air supply device and air suction device form directional air circulation in box, further disperse local retention air, and strengthen the effect of moisture absorption prevention.

Description

Technical Field

[0001] This utility model relates to the field of material drying and conveying technology, specifically to a drying material conveying device. Background Technology

[0002] In the smelting process of special alloys, silicon is a core element for regulating the alloy's crystal structure and improving its high-temperature strength and corrosion resistance. Dried silica sludge is one of the core raw materials for supplying silicon in the smelting process. To ensure the effective utilization rate of silicon and the stability of the alloy composition, the silica sludge must undergo a pre-drying process to reduce its moisture content to the required standard before it can be added to the smelting furnace for melting.

[0003] In existing technologies, the conveying process from the drying equipment discharge to the smelting furnace feeding of dried silica sludge generally employs open or semi-open conveying schemes, such as belt conveyors, bucket elevators, and manual transfer silos. This type of conveying mode suffers from unavoidable air contact defects: 1. The micropores and active sites on the surface of the dried silica sludge particles easily absorb moisture from the air, causing the moisture content to rise. This rise not only reduces the dissolution rate of silicon in the melt but also disrupts the balance of silicon with other alloying elements, leading to a deviation of the alloy composition from design requirements; 2. After the water-containing silica sludge is added to the high-temperature smelting furnace, the moisture will rapidly vaporize... 1. Water vapor expands rapidly, which can easily cause safety hazards such as a sharp increase in furnace pressure and molten splashing. It can also disrupt the high-temperature atmosphere inside the furnace, prolong the smelting cycle, and reduce production efficiency. 2. Water vapor in the furnace can react with silica mud and alloy melt to generate low-melting-point inclusions and hydrogen. The former will reduce the tensile strength and toughness of the alloy, while the latter will easily cause defects such as porosity and looseness in the alloy, deteriorating its corrosion resistance and failing to meet the performance requirements of high-end fields. 3. Water vapor can carry fine silica mud powder to form silica-containing dust and generate acidic tail gas with the substances in the furnace, increasing the wear and tear on tail gas treatment equipment and environmental protection costs, which is not in line with the industry direction of green smelting. Utility Model Content

[0004] This invention provides a drying material conveying device to solve the problem that existing semi-open conveying devices easily absorb moisture when conveying dried silicon material, leading to reduced production efficiency.

[0005] To solve the above problems, this utility model provides a drying material conveying device, including: a box for forming a closed conveying space, a feed inlet opened on one side of the box, a discharge outlet opened on the other side of the box, a conveying device disposed inside the box, and a plurality of hoppers disposed on the conveying device; it also includes: an air supply device disposed above the feed inlet and fixed to the side wall of the box, and an air suction device disposed on the top of the box.

[0006] By significantly reducing the contact between the dried material and the air through a sealed chamber, the risk of moisture absorption is greatly reduced, ensuring the stability of the moisture content; the air supply device and the air intake device form a directional airflow circulation within the chamber, further dispersing locally stagnant air and enhancing the anti-moisture absorption effect.

[0007] Because the airflow of existing ordinary air supply devices is dispersed, the airflow cannot be fully applied to the bearing surface of the hopper, and some materials may still come into contact with the air and absorb moisture. Therefore, the air supply device provided in this application includes a blower, an air supply duct connected to the blower, and several air outlets connected to the air supply channel. The directional airflow from the air outlets covers the bearing surface of the hopper, forming a stable positive pressure protective layer on the material surface to prevent moisture in the air from contacting the material.

[0008] Since solid hoppers cannot allow airflow to penetrate, they can only form an airflow layer on the surface of the hopper, while the material inside the hopper may still absorb moisture. Therefore, the bottom and side walls of the hopper provided in this application are provided with several sieve holes. The sieve holes are smaller than the particle size of the material to be dried. The sieve holes in the hopper allow the upward airflow to penetrate the material layer and form a uniform airflow field from the bottom to the top, which greatly reduces the risk of moisture adsorption.

[0009] If the bottom of the flat hopper is matched with the straight air outlet, the airflow is likely to form a dead corner at the edge of the hopper, and the airflow cannot be fully covered. Therefore, the air outlet provided in this application is an upward-curved arc structure that makes the airflow blow upward along the air outlet, so that the airflow can completely cover the material layer.

[0010] Furthermore, the hopper provided in this application has a trapezoidal cross-section with a downward-convex arc surface at the bottom. The arc surface at the bottom of the hopper, in conjunction with the trumpet-shaped arc structure of the air outlet, allows the airflow to flow evenly along the bottom curved surface of the hopper without dead corner coverage. The airflow contacts the bottom of the hopper tangentially, reducing pressure loss and increasing airflow utilization.

[0011] Traditional equipment lacks effective control over internal airflow and cannot maintain a stable low-humidity environment. The air intake device provided in this application is a centrifugal fan, and the air intake end of the centrifugal fan is equipped with a filter to filter dust in the gas. The air intake device forms an airflow circulation system inside the box, which, together with the air supply device, creates a uniform and stable internal gas environment. The technical advantages of this application are as follows: 1. By significantly reducing the contact between the dried material and air through a sealed chamber, the risk of moisture absorption is greatly reduced, ensuring the stability of moisture content; 2. The air supply device and the air intake device form a directional airflow circulation within the box, further dispersing locally stagnant air and enhancing the moisture-proof effect. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall internal structure of the drying material conveying device provided by this utility model.

[0013] Figure 2 This is a cross-sectional structural diagram of the drying material conveying device provided by this utility model.

[0014] Figure 3 This is a schematic diagram of the air outlet structure of the drying material conveying device provided by this utility model.

[0015] Figure 4 This is a schematic diagram of the hopper structure of the drying material conveying device provided by this utility model.

[0016] Explanation of reference numerals in the attached figures: 1. Box body; 2. Feed inlet; 210. Feed channel; 3. Discharge outlet; 4. Conveying device; 5. Hopper; 6. Air supply device; 610. Blower; 620. Air supply channel; 630. Air outlet; 7. Suction device. Detailed Implementation

[0017] The following will be combined with the appendix Figures 1-4 The embodiments of the technical solution of this application are described in detail below. The following embodiments are only used to illustrate the technical solution of this application more clearly, and are therefore only examples and should not be used to limit the scope of protection of this application.

[0018] Existing open or semi-open conveying systems cannot isolate air, leading to the core problem of dried materials absorbing moisture from the air; in addition, materials are prone to scattering and contamination by environmental impurities during the conveying process, affecting the purity of alloy components; semi-open conveying systems lack directional airflow protection, and there is still a risk of air stagnation and material contact in some areas.

[0019] To solve the above problems, refer to Figure 1 and Figure 2 The drying material conveying device provided by this utility model includes a box 1 for forming a closed conveying space, a feed inlet 2 opened on one side of the box 1, a discharge outlet 3 opened on the other side of the box 1, a conveying device 4 set inside the box 1, a plurality of hoppers 5 set on the conveying device 4, an air supply device 6 set at the upper end of the feed inlet 2 and fixed to the side wall of the box 1, and an air suction device 7 set at the top of the box 1. The sealed chamber 1 significantly reduces the contact between the drying material and the air, thereby reducing the risk of moisture absorption and ensuring the stability of the moisture content. The hopper 5 holds the material to prevent it from scattering, and the sealed space reduces the mixing of impurities. The air supply device 6 and the air suction device 7 form a directional airflow circulation within the chamber, further dispersing locally stagnant air and enhancing the moisture-proof effect.

[0020] The sealed enclosure 1 is made of 304 stainless steel. The enclosure structure can be rectangular, cylindrical, or streamlined, depending on the conveying distance and spatial layout requirements. The door frame is sealed with an EPDM sealing ring, and a removable cover plate is provided, which can be secured with bolts. An explosion relief device is installed on the top or side wall of the enclosure. An internal pressure sensor, such as a PTG501 model with a range of -500~500Pa, is installed inside the enclosure 1. This sensor is linked to the suction and air supply devices; when the pressure is below -100Pa, the air supply volume is increased; when the pressure is above 100Pa, the suction volume is increased to maintain a slight positive pressure (50~100Pa) and reduce the infiltration of external air.

[0021] The conveying device 4 is located inside the housing 1 and can be either a chain or belt conveyor. Through continuous conveying within a closed environment, it ensures uniform material distribution and prevents contact with air. If a chain conveyor is selected, a modular chain plate structure can be used, with an anti-static PTFE coating on the surface. If a belt conveyor is selected, an EPDM rubber belt or a PVC anti-slip belt can be used, with a belt speed adjustment range of 0.2-0.8 m / s to suit the feeding speed. The hopper 5 can be fixed to the conveying device 4 by welding, snap-fit ​​connection, or bolt fastening to ensure that the hopper does not fall off during vibration or conveying.

[0022] Continue to refer to the appendix Figure 1 , 2 In conventional air supply devices, the airflow is dispersed, and the airflow cannot fully act on the bearing surface of the hopper 5, allowing some material to still come into contact with the air and absorb moisture. Furthermore, the pressure loss during airflow transmission is significant, resulting in insufficient air velocity upon reaching the hopper 5, failing to form an effective protective airflow layer. Therefore, the air supply device 6 provided in this embodiment includes a blower 610, an air supply duct 620 connected to the blower 610, and several air outlets 630 connected to the air supply duct 620. The directional airflow from the air outlets covers the bearing surface of the hopper 5, forming a stable positive pressure protective layer on the material surface, preventing moisture in the air from contacting the material. The optimized design of the duct and air supply components reduces pressure loss, ensuring stable airflow velocity and uniform protective effect.

[0023] Specifically, the blower 610 can be a vortex air pump, a centrifugal blower, a permanent magnet variable frequency blower, etc., and the appropriate air volume blower should be selected according to the actual moisture content of the material to be dried. The air supply channel 620 is a branch pipe, and the number of branch pipes of the air supply channel 620 and the corresponding number of air outlets 630 are set according to the number of conveying hoppers 5. Preferably, this embodiment provides 4 branch pipes, corresponding to 4 air outlets 630. The air outlets are diffuser-type air outlets with a diffusion angle of 15°~45°. The diffusion angle should not be too large to avoid airflow dispersion and failure to achieve the drying effect.

[0024] See attached document Figure 4Because the solid hopper 5 cannot allow airflow to penetrate, an airflow layer can only be formed on the surface of the hopper 5, while the material inside the hopper 5 may still absorb moisture; the inability of airflow to penetrate causes vortices to form inside the hopper 5, which may cause material to accumulate or scatter. Therefore, the bottom and side walls of the hopper 5 provided in this embodiment are provided with several sieve holes, the sieve holes being smaller than the particle size of the material to be dried. The sieve holes in the hopper 5 allow airflow to penetrate the material layer, forming a uniform airflow field from bottom to top, greatly reducing the risk of moisture adsorption; at the same time, the airflow penetration causes slight disturbance to the material layer, preventing material caking, and also assisting in more thorough material unloading.

[0025] See attached document Figure 2 , 3 If the bottom of the flat hopper 5 is matched with a straight air outlet, the airflow is prone to forming dead corners at the edge of the hopper 5, and the airflow cannot fully cover the surface. At the same time, the airflow collides perpendicularly with the bottom of the hopper 5, resulting in large pressure loss and uneven protection. Therefore, the air outlet 630 provided in this embodiment is an upward-curving trumpet-shaped arc structure, and the cross-section of the hopper 5 is a trapezoidal structure with a downward-convex arc surface at the bottom, so that the air outlet 630 is completely aligned with the bottom of the hopper 5. The combination of the arc surface at the bottom of the hopper 5 and the trumpet-shaped arc structure of the air outlet 630 allows the airflow to flow evenly along the bottom curved surface of the hopper 5, without dead corner coverage. The airflow contacts the bottom of the hopper 5 tangentially, reducing pressure loss and increasing airflow utilization.

[0026] Specifically, the air outlet 630 is welded to the side wall of the housing 1 and connected to the air supply duct 620 via a fixed bracket, with a distance of 50mm between it and the bottom of the hopper 5. The spacing between the multiple air outlets 630 is the same as the spacing between the hoppers 5.

[0027] Continue to refer to the appendix Figure 1 , 2 Existing conveying equipment generates dust during material transport and cannot form an effective internal airflow circulation, leading to dust accumulation and uneven settling within the chamber, and even leakage into the external environment through gaps, causing environmental pollution and material loss. Simultaneously, traditional equipment lacks effective control over internal airflow, failing to maintain a stable low-humidity environment. Therefore, the suction device 7 provided in this embodiment is a centrifugal fan equipped with a filter to filter dust from the gas. The suction device 7 forms an airflow circulation system within the chamber 1, working in conjunction with the air supply device 6 to create a uniform and stable internal gas environment; the filter effectively captures fine silica powder in the airflow, preventing dust escape and reducing material loss; the circulating airflow maintains uniform humidity within the chamber, lower than ambient air, preventing the dried silica powder from reabsorbing moisture and maintaining stable moisture content.

[0028] Specifically, the filter material can be stainless steel wire mesh, polyester fiber filter cloth, or PTFE membrane filter media. The appropriate mesh size should be selected according to the dust particle size. The filter can be installed at the air inlet of the fan with a detachable drawer-type structure for easy regular cleaning and replacement; or a rotary filter can be used in conjunction with an automatic dust removal system. The automatic dust removal system can be selected from existing equipment models on the market according to actual needs.

[0029] Continue to refer to the appendix Figure 1 , 2 Because the existing feed inlet 2 is mismatched with the size of the hopper 5, material spills onto the outside of the conveyor 4, causing waste and blockage. Furthermore, the horizontal setting of the feed channel 210 easily leads to material accumulation and jamming, preventing continuous feeding. Therefore, in this embodiment, the feed channel 210 connected to the feed inlet 2 has the same width as the hopper 5, and the feed channel 210 is equipped with an inclined slide plate for material to slide down under its own weight. This equal-width design reduces the spillage rate and increases raw material utilization when material falls into the hopper; the inclined slide plate utilizes the material's own weight for a stable feeding speed without accumulation or jamming. Specifically, the inclined angle of the inclined slide plate is 30°~45°, the material is wear-resistant steel, and reinforcing ribs are provided below the slide plate to prevent deformation. By controlling the feeding speed of the feed inlet 2, the rotation speed of the conveyor 4 is controlled by adjusting the drive motor (not shown in the figure, this is prior art) to match the speed at which the material slides down the inclined slide plate.

[0030] Working Principle: When dried silica mud and other materials enter the feeding channel 210 through the inlet 2, the materials slide down into the hopper 5 under their own weight under the action of the inclined slide plate. The conveying device 4, under the control of the drive motor, operates at a rate adapted to the sliding speed of the materials, conveying the materials in the hopper 5 to the outlet 3. At the same time, the blower 610 of the air supply device 6 delivers directional airflow to the bottom of the hopper 5 through the air supply pipe 620 and the air outlet 630 to prevent the materials from contacting the air and absorbing moisture during the conveying process. The suction device 7 creates negative pressure at the air outlet of the housing 1 through a centrifugal fan, controlling the airflow direction in the housing 1, so that the airflow flows from the air outlet 630 to the top of the housing 1, while filtering out any impurities that may be present through the filter screen to prevent fine powder from escaping and dust pollution.

[0031] The beneficial effects of this utility model are as follows: the sealed box design effectively prevents the dried material from contacting air and absorbing moisture during transportation, ensuring the stability of the material's moisture content; the screen hopper 5 design prevents fine powder from escaping during transportation, reducing dust pollution; the combined design of directional air supply and suction device 7 forms a directional airflow, enhancing the drying effect during material transportation, while controlling the airflow direction within the box 1 and filtering impurities to avoid secondary pollution; the matching design of the feed channel 210 and the speed of the transport device 4 improves transportation efficiency and stability, reduces production safety hazards and environmental costs, and conforms to the industry direction of green smelting.

[0032] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A drying material conveying device, comprising: A box (1) for forming a closed conveying space, an inlet (2) opened on one side of the box (1), an outlet (3) opened on the other side of the box (1), a conveying device (4) installed inside the box (1), and several hoppers (5) installed on the conveying device (4). The feature is that it further includes: an air supply device (6) disposed at the upper end of the feed inlet (2) and fixed on the side wall of the box body (1), and an air suction device (7) disposed at the top of the box body (1).

2. The drying material conveying device according to claim 1, characterized in that, The air supply device (6) includes a blower (610), an air supply duct connected to the blower (610), and a plurality of air outlets (630) connected to the air supply channel (620).

3. The drying material conveying device according to claim 2, characterized in that, The air outlet (630) is an upward-curving trumpet-shaped structure.

4. The drying material conveying device according to claim 1, characterized in that, The bottom and side walls of the hopper (5) are provided with several sieve holes.

5. The drying material conveying device according to claim 4, characterized in that, The sieve aperture is smaller than the particle size of the transported material.

6. The drying material conveying device according to claim 4, characterized in that, The hopper (5) has a trapezoidal cross-section with a downward-convex arc surface at the bottom.

7. The drying material conveying device according to claim 1, characterized in that, The suction device (7) is a centrifugal fan, and the air inlet of the centrifugal fan is equipped with a filter screen to filter dust in the gas.

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