A device for preventing long-term wear of a mill burn return powder receiving hopper

Abstract

The utility model provides a device that prevents machine burning return powder from long -term abrasion of receiving hopper belongs to ironmaking sintering, blast furnace machine burns return powder recovery equipment technical field, including return powder receiving hopper, its characterized in that, still including buffer board, buffer board sets up below return powder receiving hopper, and with the discharge port of return powder receiving hopper opposite, the middle part of buffer board is equipped with the blanking hole, and the blanking hole is coaxially arranged with the discharge port of return powder receiving hopper, and the aperture of blanking hole is less than the inside diameter of the discharge port of return powder receiving hopper. The utility model can effectively reduce the abrasion of return powder to receiving hopper, prolong its life, reduce the repair frequency and leak material.

Description

Technical Field

[0001] This utility model belongs to the technical field of sintering and blast furnace sintering return powder recovery equipment, and in particular relates to a device for preventing long-term wear of the blast furnace sintering return powder receiving hopper. Background Technology

[0002] In the processes of ironmaking, sintering, and blast furnace production, the recovery of recycled ore is a crucial step in ensuring raw material utilization and reducing production costs. With the continuous increase in blast furnace capacity, daily ore consumption has increased significantly, leading to a substantial increase in the amount of recycled ore. Traditional blast furnace charging systems must operate at full capacity, and the recycled ore receiving hopper, as a key component in the recycled ore conveying process, bears the continuous impact of large amounts of recycled ore.

[0003] In the existing design of return powder receiving hoppers, the return powder, after screening, enters directly from the top of the hopper and falls onto the return powder conveyor belt below through the discharge port. Because the return powder (especially larger particles) has a high falling velocity and impact force, it directly collides and rubs against the lower inner wall of the receiving hopper during its descent. After long-term operation, the lower inner wall of the receiving hopper suffers severe wear, significantly shortening its service life. Under high-capacity operating conditions, the service life of traditional receiving hoppers is typically reduced from 3-4 months to 1-2 months.

[0004] Wear and tear on the receiving hopper can easily lead to material leakage. Firstly, leakage causes dust to fill the work area, deteriorating the working environment and failing to meet environmental and occupational health requirements. Secondly, leaked material falling onto the conveyor belt and surrounding equipment not only increases the workload for cleaning personnel but can also cause belt misalignment and jamming due to material accumulation, posing significant safety hazards. Furthermore, to maintain production, frequent welding repairs are required on the worn parts, each requiring a 2-4 hour shutdown, which disrupts production continuity and increases maintenance costs and worker workload.

[0005] Therefore, how to effectively reduce the wear of the blast furnace return powder on the receiving hopper, extend its service life, and reduce material leakage and maintenance frequency has become a technical problem that urgently needs to be solved in the current blast furnace return powder recovery system. Utility Model Content

[0006] This invention addresses the problem of severe wear on the lower inner wall of the return powder receiving hopper. It provides a device to prevent long-term wear of the machine-burned return powder receiving hopper, effectively reducing wear caused by return powder, extending its service life, and decreasing material leakage and maintenance frequency.

[0007] The technical solution adopted by this utility model for a device to prevent long-term wear of the feed hopper from burning out and returning powder is as follows:

[0008] A device for preventing long-term wear of a waste powder receiving hopper includes a waste powder receiving hopper and a buffer plate. The buffer plate is disposed below the waste powder receiving hopper and opposite to the discharge port of the waste powder receiving hopper. A discharge hole is provided in the middle of the buffer plate. The discharge hole is coaxially arranged with the discharge port of the waste powder receiving hopper, and the diameter of the discharge hole is smaller than the inner diameter of the discharge port of the waste powder receiving hopper.

[0009] A further improvement of this utility model is that the buffer plate is made of wear-resistant steel plate and the thickness of the buffer plate is 8-12mm.

[0010] A further improvement of this utility model is that the discharge hole is circular, and the diameter of the discharge hole is 60%-80% of the inner diameter of the discharge port of the return powder receiving hopper.

[0011] A further improvement of this utility model is that it also includes at least two supports; one end of the support is fixedly connected to the outer wall of the return powder receiving hopper, and the other end is fixedly connected to the side of the buffer plate away from the return powder receiving hopper.

[0012] A further improvement of this utility model is that the connection between the support and the return powder receiving hopper is by welding; and the connection between the support and the buffer plate is by bolting.

[0013] A further improvement of this utility model is that the edge of the buffer plate is provided with an upwardly bent baffle, the height of which is 3-8cm.

[0014] A further improvement of this utility model is that the distance between the buffer plate and the discharge port of the return powder receiving hopper is 15-25cm.

[0015] A further improvement of this utility model is that the inner wall of the discharge hole is provided with a wear-resistant bushing made of high-chromium cast iron.

[0016] A further improvement of this utility model is that: the buffer plate is provided with at least two reinforcing ribs on the side facing the return powder receiving hopper, and the reinforcing ribs are distributed radially along the discharge hole.

[0017] The technological advancements achieved by this utility model due to the adoption of the above technical solution are as follows:

[0018] This utility model's buffer plate can receive returned powder after screening, allowing the returned powder to fall onto the buffer plate for kinetic energy buffering before entering the returned powder conveyor belt through the discharge hole, thus preventing the returned powder from directly impacting the inner wall of the receiving hopper. In practical applications, the service life of the receiving hopper can be extended from the original 1-2 months to 6-8 months, significantly reducing the frequency of equipment replacement.

[0019] The edge guards of this utility model's buffer plate prevent dust from overflowing from the edge of the buffer plate. Combined with the directional guidance of the discharge holes, the returned dust is concentrated and falls onto the conveyor belt, effectively solving the problem of material leakage caused by wear in traditional receiving hoppers. On-site dust concentration is reduced by more than 60%, significantly improving the working environment and meeting environmental and safety regulations.

[0020] After the wear of the receiving hopper is reduced by this utility model, there is no need for frequent welding repairs. The number of repairs can be reduced by 8-10 times per year, saving 20-40 hours of downtime. At the same time, it reduces the consumption of maintenance materials and the cleaning and maintenance workload of on-site personnel.

[0021] The buffer plate of this utility model is made of wear-resistant material. Even if it wears out, it can be replaced separately without replacing the entire receiving hopper. The replacement process only takes 1-2 hours, and the maintenance cost is far lower than the overall replacement or overhaul of the traditional receiving hopper. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a device provided by this utility model to prevent long-term wear of the feed hopper that is burning out and returning powder.

[0023] Figure 2 This is a cross-sectional structural schematic diagram of a device provided by this utility model for preventing long-term wear of the feed hopper that is prone to burn-out powder return.

[0024] In the attached diagram: 1. Return powder receiving hopper; 2. Buffer plate; 3. Discharge hole; 4. Support; 5. Side guard; 6. Reinforcing rib. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. In the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessarily obscuring the concept of this utility model.

[0026] like Figure 1-2 As shown in the figure, this embodiment discloses a device for preventing long-term wear of a waste powder receiving hopper, including a waste powder receiving hopper 1, a buffer plate 2, a bracket 4, a retaining edge 5, a wear-resistant bushing, and reinforcing ribs 6. The waste powder receiving hopper 1 is a conical structure with a large opening at the top and a small outlet at the bottom, with an inner diameter of 80cm at the outlet. The buffer plate 2 is located directly below the waste powder receiving hopper 1 to receive falling waste powder and buffer its impact.

[0027] The aforementioned buffer plate 2 is made of 16Mn wear-resistant steel plate, which has high strength and good wear resistance, and can withstand the long-term impact of dust return. The buffer plate 2 is 10mm thick, circular in shape, and has a diameter of 100cm.

[0028] The aforementioned discharge hole 3 is located at the center of the buffer plate 2 and is coaxially aligned with the discharge port of the return powder receiving hopper 1, ensuring that the return powder falls accurately into the return powder conveyor belt below. The discharge hole 3 is circular with a diameter of 56 cm. The inner wall of the discharge hole 3 is inlaid with a high-chromium cast iron wear-resistant bushing with a thickness of 5 mm, further enhancing the wear resistance of the discharge hole 3 and preventing the hole diameter from increasing due to long-term friction from the return powder.

[0029] Four supports 4 are provided, evenly distributed along the edge of the buffer plate 2. The supports 4 are made of angle steel, with their upper ends welded to the outer wall of the return powder receiving hopper 1, and their lower ends connected to the side of the buffer plate 2 away from the receiving hopper using M12 bolts. The height of the supports 4 is 20cm, maintaining a 20cm distance between the buffer plate 2 and the discharge port of the receiving hopper.

[0030] The aforementioned retaining edge 5 is formed by bending upwards along the edge of the buffer plate 2, with a height of 5cm. This effectively prevents powder from sliding down the edge of the buffer plate 2, further reducing material leakage. The retaining edge 5 and the buffer plate 2 are an integral structure, manufactured through a bending process, avoiding stress concentration caused by welding connections.

[0031] The aforementioned reinforcing ribs 6 are located on the side of the buffer plate 2 facing the return powder receiving hopper 1. They are made of Q235 steel plate, with a "T" shaped cross-section, and consist of three ribs evenly distributed radially along the discharge hole 3. The included angle between adjacent reinforcing ribs 6 is 120°. The reinforcing ribs 6 are 22cm long, 8mm thick, and 1cm wide, and are used to enhance the deformation resistance of the buffer plate 2 and prevent bending due to long-term stress.

[0032] The working principle of the device for preventing long-term wear of the waste powder receiving hopper in this embodiment is as follows: During installation, firstly, weld the upper ends of the four brackets 4 to the outer wall of the waste powder receiving hopper 1, 10cm away from the edge of the discharge port, ensuring that the brackets 4 are perpendicular to the horizontal plane; then, fix the buffer plate 2 to the lower end of the brackets 4 with bolts, and adjust the position so that the discharge hole 3 is aligned with the center of the discharge port of the receiving hopper and the waste powder conveyor belt; finally, check the firmness of each connection part to ensure that there is no looseness.

[0033] During operation, the returned powder, after being screened, enters from the upper opening of the returned powder receiving hopper 1, slides down the inner wall of the hopper to the discharge port, and then falls onto the buffer plate 2. Due to the supporting effect of the buffer plate 2, the falling speed of the returned powder is greatly reduced, and the impact force is buffered; then, under its own gravity and the push of the subsequent materials, the returned powder falls from the discharge hole 3 into the returned powder conveyor belt below, completing the conveying process.

[0034] If the buffer plate 2 or wear-resistant bushing is found to be severely worn during long-term use, the bolts at the lower end of the bracket 4 can be loosened, the buffer plate 2 can be removed and replaced. The replacement process only takes 1.5 hours and does not require disassembly of the return powder receiving hopper 1, which greatly improves maintenance efficiency.

[0035] In the above embodiments, this utility model provides a device to prevent long-term wear of the waste powder receiving hopper caused by machine burnout. The buffer plate of this utility model can receive the waste powder after screening, so that the waste powder first falls on the buffer plate for kinetic energy buffering, and then enters the waste powder conveyor belt through the discharge hole, avoiding the waste powder directly impacting the inner wall of the receiving hopper. In practical applications, the service life of the receiving hopper can be extended from the original 1-2 months to 6-8 months, significantly reducing the equipment replacement frequency. The edge guard of the buffer plate of this utility model can prevent the waste powder from overflowing from the edge of the buffer plate. Combined with the directional guidance of the discharge hole, the waste powder is concentrated and falls into the conveyor belt, effectively solving the problem of material leakage caused by wear in traditional receiving hoppers. The dust concentration on site is reduced by more than 60%, and the working environment is significantly improved, meeting environmental protection and safety standards. After the wear of the receiving hopper of this utility model is slowed down, there is no need for frequent welding repairs, which can reduce the number of maintenance times by 8-10 times per year, saving 20-40 hours of downtime. At the same time, it reduces the consumption of maintenance materials and the cleaning and maintenance workload of on-site personnel. The buffer plate of this utility model is made of wear-resistant material. Even if it wears out, it can be replaced separately without replacing the entire receiving hopper. The replacement process only takes 1-2 hours, and the maintenance cost is far lower than the overall replacement or overhaul of traditional receiving hoppers.

[0036] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the design concept of the present invention should fall within the protection scope of the present invention. The technical content for which protection is sought in the present invention has been fully described in the claims.

Claims

1. A device for preventing long-term wear of a waste powder receiving hopper, comprising a waste powder receiving hopper (1), characterized in that, It also includes a buffer plate (2); the buffer plate (2) is located below the return powder receiving hopper (1) and is opposite to the discharge port of the return powder receiving hopper (1); the buffer plate (2) has a discharge hole (3) in the middle, the discharge hole (3) is coaxially arranged with the discharge port of the return powder receiving hopper (1), and the diameter of the discharge hole (3) is smaller than the inner diameter of the discharge port of the return powder receiving hopper (1).

2. The device for preventing long-term wear of the feed hopper from burning out and returning powder, as described in claim 1, is characterized in that: The buffer plate (2) is made of wear-resistant steel plate and the thickness of the buffer plate (2) is 8-12mm.

3. The device for preventing long-term wear of the feed hopper from burning out and returning powder, as described in claim 1, is characterized in that: The discharge hole (3) is circular, and the diameter of the discharge hole (3) is 60%-80% of the inner diameter of the discharge port of the return powder receiving hopper (1).

4. The device for preventing long-term wear of the feed hopper from burning out and returning powder according to claim 1, characterized in that: It also includes at least two supports (4); one end of the support (4) is fixedly connected to the outer wall of the return powder receiving hopper (1), and the other end is fixedly connected to the side of the buffer plate (2) away from the return powder receiving hopper (1).

5. The device for preventing long-term wear of the feed hopper from burning out and returning powder according to claim 4, characterized in that: The bracket (4) is connected to the return powder receiving hopper (1) by welding; the bracket (4) is connected to the buffer plate (2) by bolting.

6. The device for preventing long-term wear of the feed hopper from burning out and returning powder according to claim 1, characterized in that: The buffer plate (2) has an upwardly bent baffle (5) at its edge, and the baffle (5) is 3-8cm high.

7. The device for preventing long-term wear of the feed hopper from burning out and returning powder according to claim 1, characterized in that: The distance between the buffer plate (2) and the discharge port of the return powder receiving hopper (1) is 15-25cm.

8. The device for preventing long-term wear of the feed hopper from burning out and returning powder according to claim 1, characterized in that: The inner wall of the discharge hole (3) is provided with a wear-resistant bushing made of high-chromium cast iron.

9. The device for preventing long-term wear of the feed hopper from burning out and returning powder according to claim 1, characterized in that: The buffer plate (2) is provided with at least two reinforcing ribs (6) on the side facing the return powder receiving hopper (1), and the reinforcing ribs (6) are distributed radially along the discharge hole (3).

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