Dust collection device for fixed-point casting in front of metallurgical submerged arc furnace

Abstract

This utility model relates to the field of submerged arc furnace technology, specifically a dust collection device for fixed-point casting in front of a metallurgical submerged arc furnace. It includes an enclosed fume hood, a semi-enclosed fume hood connected to one side of the enclosed fume hood, support legs connected to the four lower corners of the semi-enclosed fume hood, and rotating side protection mechanisms symmetrically arranged on both sides of the semi-enclosed fume hood. The rotating side protection mechanism includes two mounting brackets spaced apart on one side of the semi-enclosed fume hood, hydraulic cylinders hinged to the mounting brackets, rotating side protection plates hinged to the piston rods of the two hydraulic cylinders, and a rotating mechanism connected to one end of the rotating side protection plates and between the corresponding two support legs. This device seals the bottom of both sides of the fume hood, reducing flue gas leakage, enhancing dust collection, controlling the concentration of dust during operation, and protecting health and the environment. The symmetrical rotating side protection mechanism prevents molten iron from splashing, preventing burns, eliminating hidden dangers, reducing accidents, ensuring safe production, and solving two major problems of traditional fume hoods.

Description

Technical Field

[0001] This utility model relates to the field of submerged arc furnace technology, specifically to a fixed-point casting and dust collection device for metallurgical submerged arc furnaces. Background Technology

[0002] As a high-energy-consuming piece of equipment in the smelting industry, the fugitive dust collection equipment in the casting stage of the submerged arc furnace is a core component for achieving energy conservation, emission reduction, environmental protection, and cleaner production in the ferroalloy industry. Currently, in the domestic ferroalloy submerged arc furnace production process, positive or negative pressure baghouse dust collection systems are commonly used to collect dust from the main body of the furnace and the tapping outlet. After treatment by this system, the dust generated during production is purified, and the particulate matter concentration in the dust emitted by the dust collector basically meets the relevant emission standards.

[0003] In the traditional submerged arc furnace casting operation, the fume hood is installed above the tilting mechanism, the guide channel, and the ingot mold car to collect the flue gas generated when pouring high-temperature liquid. Considering that the ingot mold car needs to move before and after pouring, the bottom of the corresponding two sides of the fume hood above the ingot mold car needs to remain open.

[0004] However, the following problems exist in the actual pouring process: When pouring, because the bottom of both sides of the fume hood is open, a large amount of smoke will overflow from these openings, weakening the dust collection effect above the mold car. This makes it difficult to effectively control the dust concentration in the working environment, posing a potential threat to the health of operators and polluting the surrounding environment. In addition, during the pouring process, the molten iron in the ladle flows into the mold car through the guide channel. During this period, because the bottom of both sides of the fume hood is open, splashed molten iron is very easy to splash out from the openings. The temperature of this splashed molten iron is extremely high. Once it comes into contact with the human body, it will cause burns and other safety accidents to the operators, leading to serious production accidents and losses to the company's safe production. Utility Model Content

[0005] The purpose of this utility model is to provide a dust collection device for fixed-point casting in front of a metallurgical submerged arc furnace, which solves the problems of traditional submerged arc furnaces where the bottom of both sides of the fume hood is open during casting, resulting in a large amount of flue gas overflowing during casting, which weakens the collection of dust, makes it difficult to control the concentration, threatens health, pollutes the environment, and causes molten iron to splash and injure people, leading to accidents and endangering safe production.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a fixed-point dust collection device for casting in front of a metallurgical submerged arc furnace, comprising an enclosed fume hood, a semi-enclosed fume hood connected to one side of the enclosed fume hood, and supporting legs connected to the four lower corners of the semi-enclosed fume hood, as well as rotating side protection mechanisms symmetrically arranged on both sides of the semi-enclosed fume hood; the rotating side protection mechanism is rotatably connected to two supporting legs at corresponding positions; the two supporting legs closer to the enclosed fume hood are connected to the outer wall of the enclosed fume hood; the rotating side protection mechanism includes two mounting brackets spaced apart on one side of the semi-enclosed fume hood, a hydraulic cylinder hinged to the mounting brackets, a rotating side protection plate hinged to the piston rods of the two hydraulic cylinders, and a rotating mechanism connected to one end of the rotating side protection plate and between the corresponding two supporting legs; the end of the semi-enclosed fume hood away from the enclosed fume hood has a closed structure.

[0007] Furthermore, the rotating mechanism includes a fixed shaft disposed between two corresponding support legs, and a rotating cylinder sleeved on the outer wall of the fixed shaft; the outer side of the rotating cylinder is connected to one end of the rotating side protective plate.

[0008] Furthermore, an L-shaped sealing plate is connected between two adjacent support legs, and the upper side of the L-shaped sealing plate is connected to the lower side of the semi-enclosed smoke collection hood; the two L-shaped sealing plates are arranged symmetrically, the rotating cylinder is located outside the L-shaped sealing plate, and when the rotating side protective plate rotates to the vertical position, its side is tightly fitted with the outer side of the L-shaped sealing plate.

[0009] Furthermore, the mounting bracket includes a connecting vertical rod disposed on one side of the semi-enclosed smoke hood, a supporting horizontal rod connected to the upper side of the connecting vertical rod, an inclined connecting rod obliquely connected to the outer wall of the supporting horizontal rod and the connecting vertical rod, and a reinforcing rod connected to the inclined connecting rod and the supporting horizontal rod; the hydraulic cylinder is hinged to the lower side of the supporting horizontal rod and located on one side of the inclined connecting rod.

[0010] Furthermore, the upper side of the enclosed smoke hood is connected to a smoke and dust conveying pipe; the upper side of the semi-enclosed smoke hood is connected to a 90° elbow branch pipe and a plurality of vertical branch pipes distributed along its length direction, the plurality of vertical branch pipes being arranged at equal intervals, one end of each being connected to the outer wall of the horizontal section of the 90° elbow branch pipe; one end of the 90° elbow branch pipe is connected to the outer wall of the smoke and dust conveying pipe.

[0011] Furthermore, the end of the enclosed smoke hood away from the semi-enclosed smoke hood has a notch.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] This invention utilizes a combination of a surrounding fume hood and a semi-surrounding fume hood, along with symmetrically arranged rotating side protective mechanisms, to form an openable and closable enclosed dust collection space. When the mold car enters the work area, the rotating side protective plates open horizontally under the drive of hydraulic cylinders, providing a passage for the mold car and ensuring smooth production. During casting operations, the rotating side protective plates close vertically, sealing off the previously open areas at the bottom of both sides of the fume hood, reducing the gas leakage rate, enhancing the collection effect of dust above the mold car, and effectively controlling the dust concentration in the work environment. This not only protects the health of operators but also significantly reduces pollution to the surrounding environment. Simultaneously, the symmetrically arranged rotating side protective mechanisms prevent molten iron from splashing during the casting process, avoiding burns to operators from hot molten iron splashing out of the openings, eliminating the safety hazards caused by molten iron splashing, reducing the probability of production accidents, and providing a guarantee for safe production for enterprises. This solves the problems of gas overflow and molten iron splashing that exist in traditional fume hoods. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the fixed-point casting dust collection device in front of the metallurgical submerged arc furnace of this utility model.

[0015] Figure 2 This is a side cross-sectional schematic diagram of the fixed-point casting dust collection device in front of the metallurgical submerged arc furnace of this utility model.

[0016] Figure 3 This is a schematic diagram of the structure of the L-shaped sealing plate of this utility model.

[0017] In the diagram: 1. Enclosed smoke hood; 2. Notch; 3. Semi-enclosed smoke hood; 4. Support leg; 5. Rotating cylinder; 6. Fixed shaft; 7. Rotating side protective plate; 8. Hydraulic cylinder; 9. Supporting crossbar; 10. Connecting vertical bar; 11. Reinforcing bar; 12. Inclined connecting rod; 13. L-shaped sealing plate; 14. Smoke and dust conveying pipe; 15. Right-angle elbow branch pipe; 16. Vertical branch pipe. Detailed Implementation

[0018] Please see Figure 1-3A dust collection device for fixed-point casting in front of a metallurgical submerged arc furnace includes an enclosed fume hood 1, a semi-enclosed fume hood 3 connected to one side of the enclosed fume hood 1, and support legs 4 connected to the four lower corners of the semi-enclosed fume hood 3, as well as rotating side protection mechanisms symmetrically arranged on both sides of the semi-enclosed fume hood 3. The rotating side protection mechanisms are rotatably connected to the two support legs 4 at corresponding positions. The two support legs 4 near the enclosed fume hood 1 are connected to the outer wall of the enclosed fume hood 1. The rotating side protection mechanism includes two mounting brackets spaced apart on one side of the semi-enclosed fume hood 3, hydraulic cylinders 8 hinged to the mounting brackets, rotating side protection plates 7 hinged to the output shafts of the two hydraulic cylinders 8, and a rotating mechanism connected to one end of the rotating side protection plate 7 and between the two corresponding support legs 4. The end of the semi-enclosed fume hood 3 away from the enclosed fume hood 1 is a closed structure.

[0019] The rotating mechanism includes a fixed shaft 6 detachably connected between two corresponding support legs 4 (the two ends of the fixed shaft 6 are connected to the support legs 4 by bolts, facilitating the disassembly of the rotating cylinder 5 during maintenance), and a rotating cylinder 5 sleeved on the outer wall of the fixed shaft 6; the outer side of the rotating cylinder 5 is connected to one end of the rotating side protective plate 7. The two ends of the fixed shaft 6 are rigidly connected between the corresponding support legs 4, forming a rotation fulcrum, while the rotating cylinder 5 is sleeved on the outer wall of the fixed shaft 6 and can rotate freely, providing low-friction rotational support for the rotating side protective plate 7. The rotating cylinder 5 and the fixed shaft 6 are fitted with a clearance fit and filled with high-temperature grease (temperature resistance ≥300℃, conforming to GB / T7631.8 high-temperature grease standard), which can resist the problem of component jamming under high-temperature conditions in front of the furnace.

[0020] An L-shaped sealing plate 13 (made of 304 stainless steel) connects two adjacent support legs 4. The upper side of the L-shaped sealing plate 13 is connected to the lower side of the semi-enclosed fume hood 3. The two L-shaped sealing plates 13 are symmetrically arranged. The rotating cylinder 5 is located outside the L-shaped sealing plate 13, and when the rotating side protective plate 7 rotates to the vertical position, its side is tightly fitted with the outer side of the L-shaped sealing plate 13. One side of the rotating side protective plate 7 and the L-shaped sealing plate 13 are sealed by ceramic fiber rubber strips to prevent dust from leaking from the gap between the rotating side protective plate 7 and the support leg 4, thereby improving the dust collection efficiency of the device and further reducing the pollution of the surrounding environment by dust.

[0021] The mounting bracket includes a connecting vertical rod 10 connected to one side of the semi-enclosed smoke hood 3, a supporting horizontal rod 9 connected to the upper side of the connecting vertical rod 10, an inclined connecting rod 12 diagonally connected to the outer wall of the supporting horizontal rod 9 and the connecting vertical rod 10, and a reinforcing rod 11 connected to the inclined connecting rod 12 and the supporting horizontal rod 9; the hydraulic cylinder 8 is hinged to the lower side of the supporting horizontal rod 9 and located on one side of the inclined connecting rod 12. The connecting vertical rod 10 and the supporting horizontal rod 9 form an L-shaped basic frame, and the diagonally arranged inclined connecting rod 12 and the reinforcing rod 11 constitute a stable triangular support structure, improving the bending strength of the mounting bracket, preventing deformation or damage to the mounting bracket, and ensuring that the hydraulic cylinder 8 is in a stable working state.

[0022] The upper side of the enclosed smoke hood 1 is connected to a smoke and dust conveying pipe 14; the upper side of the semi-enclosed smoke hood 3 is connected to right-angle elbow branch pipes 15 and multiple vertical branch pipes 16 distributed along its length. The multiple vertical branch pipes 16 are arranged at equal intervals, and one end of each is connected to the outer wall of the horizontal section of the right-angle elbow branch pipe 15; one end of the right-angle elbow branch pipe 15 is connected to the outer wall of the smoke and dust conveying pipe 14. By coordinating the right-angle elbow branch pipes 15 with the multiple vertical branch pipes 16 arranged at equal intervals, a uniform negative pressure field for air extraction can be formed, improving the smoke collection efficiency of the semi-enclosed smoke hood 3 along its entire length and solving the problem of uneven air extraction in the traditional single main smoke and dust conveying pipe 14.

[0023] The enclosed smoke hood 1 has a notch 2 at the end away from the semi-enclosed smoke hood 3. The notch 2 ensures that the transport car carrying the molten iron ladle can drive into the enclosed smoke hood 1 through the notch 2.

[0024] Working process and principle: When the ingot mold car enters the casting station, the control system drives the hydraulic cylinder 8 to retract, which drives the rotating cylinder 5 connected to the rotating side protective plate 7 to rotate around the outside of the fixed shaft 6, so that the rotating side protective plate 7 changes from a vertical state to a horizontal open state, providing passage space for the ingot mold car; after the ingot mold car is positioned, the hydraulic cylinder 8 extends and pushes the rotating side protective plate 7 to rotate to the vertical position, and its side is tightly fitted with the L-shaped sealing plate 13, which, together with the closed end of the semi-enclosed fume hood 3 and the enclosed fume hood 1, forms a closed dust collection space. The transport car carrying the molten iron ladle enters the interior through the opening 2 of the enclosed fume hood 1. The tilting mechanism drives the ladle to tilt, injecting the high-temperature liquid into the guide channel and flowing into the ingot mold car. The flue gas generated during this process is extracted by the dust conveying pipe 14 on the enclosed fume hood 1, and the right-angle elbow branch pipe 15 and vertical branch pipe 16 on the semi-enclosed fume hood 3, transporting the dust to the subsequent processing equipment. The vertical branch pipe 16 is evenly distributed to balance the extraction efficiency of each area. After pouring, the rotating side protective plate 7 opens again, and the ingot mold car moves out along the track. At the same time, the L-shaped sealing plate 13 and the rotating side protective mechanism further prevent the leakage of flue gas. The hydraulic cylinder 8 ensures driving stability through the triangular support structure of the mounting bracket. The entire process is automated and linked with the pouring process through the PLC control system, improving the dust collection efficiency and eliminating the safety hazard of molten iron splashing.

[0025] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A dust collection device for fixed-point casting in front of a metallurgical submerged arc furnace, comprising an enclosed fume hood (1) and a semi-enclosed fume hood (3) connected to one side of the enclosed fume hood (1), characterized in that, It also includes support legs (4) connected to the four corners of the lower side of the semi-enclosed smoke hood (3) respectively, and rotating side protection mechanisms symmetrically arranged on both sides of the semi-enclosed smoke hood (3); the rotating side protection mechanism is rotatably connected to the two support legs (4) at the corresponding positions; the two support legs (4) close to the enclosed smoke hood (1) are connected to the outer wall of the enclosed smoke hood (1); the rotating side protection mechanism includes two mounting brackets spaced apart on one side of the semi-enclosed smoke hood (3), a hydraulic cylinder (8) hinged to the mounting bracket, a rotating side protection plate (7) hinged to the piston rod of the two hydraulic cylinders (8), and a rotating mechanism connected to one end of the rotating side protection plate (7) and connected between the two corresponding support legs (4); the end of the semi-enclosed smoke hood (3) away from the enclosed smoke hood (1) is a closed structure.

2. The casting dust collection device according to claim 1, characterized in that, The rotating mechanism includes a fixed shaft (6) disposed between two corresponding support legs (4) and a rotating cylinder (5) sleeved on the outer wall of the fixed shaft (6); the outer side of the rotating cylinder (5) is connected to one end of the rotating side protective plate (7).

3. The casting dust collection device according to claim 2, characterized in that, An L-shaped sealing plate (13) is connected between two adjacent support legs (4). The upper side of the L-shaped sealing plate (13) is connected to the lower side of the semi-enclosed smoke hood (3). The two L-shaped sealing plates (13) are arranged symmetrically. The rotating cylinder (5) is located outside the L-shaped sealing plate (13). When the rotating side protective plate (7) rotates to the vertical position, its side is tightly fitted with the outside of the L-shaped sealing plate (13).

4. The casting dust collection device according to claim 1, characterized in that, The mounting bracket includes a connecting vertical rod (10) on one side of the semi-enclosed smoke hood (3), a supporting horizontal rod (9) connected to the upper side of the connecting vertical rod (10), an inclined connecting rod (12) obliquely connected to the outer wall of the supporting horizontal rod (9) and the connecting vertical rod (10), and a reinforcing rod (11) connected to the inclined connecting rod (12) and the supporting horizontal rod (9); the hydraulic cylinder (8) is hinged to the lower side of the supporting horizontal rod (9) and located on one side of the inclined connecting rod (12).

5. The casting dust collection device according to claim 1, characterized in that, The upper side of the enclosed smoke hood (1) is connected to a smoke and dust conveying pipe (14); the upper side of the semi-enclosed smoke hood (3) is connected to a right-angle elbow branch pipe (15) distributed along its length and a plurality of vertical branch pipes (16), the plurality of vertical branch pipes (16) are arranged at equal intervals, and one end of each of them is connected to the outer wall of the horizontal section of the right-angle elbow branch pipe (15); one end of the right-angle elbow branch pipe (15) is connected to the outer wall of the smoke and dust conveying pipe (14).

6. The casting dust collection device according to claim 1, characterized in that, The enclosed smoke hood (1) has a notch (2) at the end away from the semi-enclosed smoke hood (3).

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