A kind of oxidized pellet return screening device

Abstract

The utility model relates to screening equipment technical field, the utility model provides an oxidized pellet return material screening device for receiving and screening the leakage of chain grate machine and rotary kiln interface, including return material pipe, branch pipe and screening mechanism, return material pipe is used to connect the interface of chain grate machine and rotary kiln to receive the leakage, branch pipe is located in return material pipe side wall and is communicated with return material pipe, and screening mechanism is located at the communicating port of branch pipe and return material pipe, is used for screening out the broken material, powder in leakage and falling into branch pipe, driven gear can be under the action of intermittent meshing with driving gear, drive screening unit intermittent swing to the inclined state to release the leakage that has not been screened out on screening unit to the return material pipe to continue conveying. Through the above technical scheme, the technical problem that the broken material and the powder are contained in the oxidized pellet return material in the related art, and the rotary kiln ring problem is easily caused.

Description

Technical Field

[0001] The embodiments of this utility model relate to the field of screening equipment technology, specifically to a screening device for oxidized pellet return material. Background Technology

[0002] As a fundamental industry of the nation, the steel industry plays a vital supporting role in the development of the national economy. In the steel production process, the ironmaking stage is the key step in converting iron ore into molten iron. High-quality ironmaking raw materials are crucial for improving ironmaking efficiency, reducing production costs, and enhancing the quality of molten iron.

[0003] Oxidized pellets are an important raw material for ironmaking, possessing high strength and good metallurgical properties. In its production process, iron concentrate powder is made into spherical particles, preheated by a chain grate machine, and then transported to a rotary kiln for high-temperature oxidation roasting, thereby obtaining oxidized pellet products that meet the needs of ironmaking.

[0004] However, during the process of conveying pellets from the chain grate to the rotary kiln, pellet leakage and return are common at the interface between the chain grate and the rotary kiln. These leaking and returned pellets (collectively referred to as returned material) are mostly qualified preheated pellets. Currently, the common method for handling returned material is to install a collection hopper below the interface between the chain grate and the rotary kiln, and then directly convey the collected returned material to a bucket elevator via a chute, from where it is fed into the rotary kiln.

[0005] Existing return material processing methods can recover qualified preheated pellets, but the return material usually contains a certain proportion of powder, which consists of broken pellets and powder. When the powder enters the rotary kiln directly, it easily adheres to the kiln wall under the high-temperature roasting environment. As production continues, the powder adhering to the kiln wall accumulates, frequently causing ring formation. Ring formation in the rotary kiln not only affects the normal flow of materials and heat exchange within the kiln, reducing the roasting quality and production efficiency of the oxidized pellets, but also increases the energy consumption of the equipment.

[0006] Therefore, how to effectively solve the problem of rotary kiln ring formation caused by powder in the return material of oxidized pellets has become a key technical problem that urgently needs to be solved in the production of oxidized pellets. It is of great significance for improving the production efficiency of oxidized pellets, reducing production costs, and ensuring the continuity of steel production. Utility Model Content

[0007] To overcome the above-mentioned defects, embodiments of this utility model provide an oxide pellet return screening device, which solves the technical problem in related technologies that oxide pellet return materials contain broken materials and powders, which easily cause ring formation in rotary kilns.

[0008] According to one aspect, at least one embodiment of the present invention provides an oxidized pellet return material screening device for receiving and screening leakage material at the interface between a chain grate machine and a rotary kiln. The device includes a return pipe, a distribution pipe, and a screening mechanism. The return pipe is used to connect the interface between the chain grate machine and the rotary kiln to receive the leakage material. The distribution pipe is disposed on the side wall of the return pipe and is connected to the return pipe. The screening mechanism is disposed at the connection between the distribution pipe and the return pipe and is used to screen out the broken material and powder in the leakage material and let them fall into the distribution pipe. The screening mechanism includes a drive gear, a driven gear, a screening unit, and a return spring. The drive gear and the driven gear are both rotatably disposed inside the distribution pipe. The drive gear is an incomplete gear and intermittently meshes with the driven gear. The screening unit is connected to the driven gear and can swing with the driven gear. The driven gear, under the action of intermittent meshing with the drive gear, can drive the screening unit to intermittently swing to an inclined state, so as to release the material that has not been screened out on the screening unit into the return pipe for continued conveying; The return spring acts on the inner wall of the distribution pipe and the screening unit at both ends. After the driven gear disengages from the driving gear, the return spring can provide a force to make the screening unit swing back to its original position.

[0009] For example, in at least one embodiment of the present invention, an oxidized pellet return screening device further includes: An installation chamber is provided on the outer wall of the material distribution pipe. The installation chamber is connected to the material distribution pipe, and both the drive gear and the driven gear are located inside the installation chamber.

[0010] For example, in at least one embodiment of the present invention, an oxidized pellet return screening device further includes: The screening unit includes an outer frame and a screen, the outer frame is connected to the driven gear, and the screen is movably disposed within the screen.

[0011] For example, in at least one embodiment of the present invention, an oxidized pellet return screening device further includes: A transmission rod is provided on the screen, and an intermittent striking unit is provided in the installation chamber. The intermittent striking unit is used to intermittently strike the transmission rod to make the screen vibrate.

[0012] For example, in at least one embodiment of the present invention, an oxidized pellet return screening device further includes: The intermittent striking unit is a striking disc coaxially mounted on the drive gear. The striking disc has multiple striking parts around its circumference, and the transmission rod has a transmission part. The multiple striking parts can strike the transmission part sequentially under the rotation of the striking disc, so that the transmission rod drives the screen to vibrate.

[0013] For example, in at least one embodiment of the present invention, an oxidized pellet return screening device further includes: A buffer spring connects the screen to the outer frame.

[0014] For example, in at least one embodiment of the present invention, an oxidized pellet return screening device further includes: A flexible compensation pipe is connected between the bottom surface of the outer frame and the inner wall of the distribution pipe. The top opening of the flexible compensation pipe covers the screen and is used to guide the crushed material and powder screened out by the screen into the distribution pipe.

[0015] For example, in at least one embodiment of the present invention, an oxidized pellet return screening device further includes: The outer wall of the return pipe is hinged with an inspection door, which faces the screening mechanism to facilitate the maintenance of the screening mechanism.

[0016] For example, in at least one embodiment of the present invention, an oxidized pellet return screening device further includes: The bottom end of the return pipe is connected to a return hopper, which is used to store the leaked material that needs to be returned to the rotary kiln.

[0017] For example, in at least one embodiment of the present invention, an oxidized pellet return screening device further includes: The bottom end of the distribution pipe is connected to a bulk material bin, which is used to store the broken materials and powders screened out during the leakage process.

[0018] The beneficial effects of the embodiments of this utility model are as follows: In this invention, the material leaking from the interface between the chain grate machine and the rotary kiln is collected through a return pipe. When the leaking material passes through the connection between the distribution pipe and the return pipe, it passes through a screening unit for screening. Due to their smaller particle size, the fragments and powders in the leaking material fall into the distribution pipe through the screening unit, thus achieving separation from the qualified leaking material.

[0019] The drive gear is rotated by an external motor. Because the drive gear is an incomplete gear, it intermittently meshes with the driven gear during rotation. When the drive gear meshes with the driven gear, the driven gear rotates, causing the screening unit connected to it to swing downwards. This causes the end of the screening unit not connected to the driven gear to swing downwards, releasing any unscreened, qualified material onto the screen into the return pipe for continued conveying. When the toothless part of the drive gear rotates to face the driven gear, the two disengage. Under the action of the return spring, the screening unit quickly swings back to its initial position to block the leakage, continuing to screen subsequent leakage material, thus achieving a continuous cycle of screening operation.

[0020] The screening mechanism removes most of the broken and powdery material from the returned material, preventing this powder from being returned to the rotary kiln. This reduces the phenomenon of powder adhering to the kiln wall, effectively lowering the frequency of ring formation, ensuring normal material flow and heat exchange within the rotary kiln, and improving the calcination quality and production efficiency of the oxidized pellets. Attached Figure Description To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this utility model and these drawings without any creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of an oxidized pellet return screening device in one embodiment of the present invention; Figure 2 for Figure 1 A front view of the inside of the feed tube in the embodiment; Figure 3 for Figure 1 A schematic diagram of the internal structure of the material distribution pipe in the embodiment; Figure 4 for Figure 1 A schematic diagram of the screening mechanism at one angle in one embodiment; Figure 5 for Figure 1 A schematic diagram of the screening mechanism from another angle in one embodiment; Figure 6 for Figure 1 A schematic diagram of the structure of the screening unit at one angle in the embodiment; Figure 7 for Figure 1 A schematic diagram of the screening unit from another angle in the embodiment; Figure 8 for Figure 7 Enlarged view of point A in the middle.

[0022] In the diagram: 1. Chain grate machine, 2. Rotary kiln, 3. Return pipe, 4. Distribution pipe, 5. Screening mechanism, 501. Drive gear, 502. Driven gear, 503. Screening unit, 504. Return spring, 401. Installation bin, 5031. Outer frame, 5032. Screen, 505. Transmission rod, 6. Striking disc, 601. Striking part, 5051. Transmission part, 506. Buffer spring, 7. Flexible compensation pipe, 8. Inspection door, 9. Return bin, 10. Bulk bin. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit its scope.

[0024] To keep the drawings concise, only the parts relevant to the utility model are shown schematically in each drawing; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "a" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0025] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0029] like Figures 1-8 The diagram illustrates an embodiment of an oxidized pellet return screening device for receiving and screening leakage material at the interface between a chain grate machine 1 and a rotary kiln 2. The device includes a return pipe 3, a distribution pipe 4, and a screening mechanism 5. The return pipe 3 is connected to the interface between the chain grate machine 1 and the rotary kiln 2 and is used to collect leakage material. The distribution pipe 4 is located on the side wall of the return pipe 3 and is interconnected with it. In the screening mechanism 5, a drive gear 501 is rotatably disposed within the distribution pipe 4. The drive gear 501 is an incomplete gear, meaning its outer circumference has incomplete teeth, and the teeth do not cover the entire circumference. The drive gear 501 is connected to the output shaft of an external motor. A driven gear 502 is rotatably disposed within the distribution pipe 4. The drive gear 501 can intermittently mesh with the driven gear 502, allowing the driven gear 502 to rotate intermittently. The screening unit 503 is connected to the driven gear 502 and moves with the swing of the driven gear 502. It is used to block the leakage of material in the return pipe 3 and separate the broken material and powder from the leakage. When the driven gear 502 swings under the drive gear 501, the screening unit 503 will swing to an inclined state. At this time, the qualified leakage material that has not been screened out on the screen 5032 will be released into the return pipe 3 under the action of gravity and continue to be conveyed backward. The two ends of the return spring 504 act on the inner wall of the distribution pipe 4 and the screening unit 503 respectively. After the driven gear 502 disengages from the drive gear 501, it can make the screening unit 503 swing back to its original position quickly.

[0030] Working principle: The material leaking from the interface between the chain grate machine 1 and the rotary kiln 2 is collected through the return pipe 3. When the leaking material passes through the connection between the distribution pipe 4 and the return pipe 3, it passes through the screening unit 503, where it is screened. Due to their smaller particle size, the broken and powdery material in the leaking material falls into the distribution pipe 4 through the screening unit 503, thus achieving separation from the qualified leaking material.

[0031] The drive gear 501 is driven by an external motor. Since the drive gear 501 is an incomplete gear, it intermittently meshes with the driven gear 502 during rotation. When the drive gear 501 meshes with the driven gear, the driven gear 502 rotates, causing the screening unit 503 connected to it to swing downwards. This causes the end of the screening unit 503 not connected to the driven gear 502 to swing downwards, releasing the unscreened qualified material from the screening unit 503 into the return pipe 3 for continued conveying. When the toothless part of the drive gear 501 rotates to face the driven gear 502, the two disengage. Under the action of the return spring 504, the screening unit 503 quickly swings back to its initial position to block the leakage, continuing to screen subsequent leakage materials, thus achieving a continuous cycle of screening operation.

[0032] The screening mechanism 5 screens out most of the broken and powdered materials in the return material, preventing these powders from being returned to the rotary kiln 2. This reduces the phenomenon of powder sticking to the kiln wall in the rotary kiln 2, effectively reducing the frequency of ring formation problems, ensuring the normal flow and heat exchange of materials in the rotary kiln 2, and improving the roasting quality and production efficiency of the oxidized pellets.

[0033] In some examples, such as Figures 1-3 As shown, the outer wall of the distribution pipe 4 is provided with an installation chamber 401 that communicates with the distribution pipe 4. The drive gear 501 and the driven gear 502 are both located inside the installation chamber 401 to avoid occupying the space inside the distribution pipe 4. The screening unit 503 consists of an outer frame 5031 and a screen 5032. The outer frame 5031 is connected to the driven gear 502, and the screen 5032 is movably disposed inside the outer frame 5031. A transmission rod 505 is provided on the screen 5032, and the transmission rod 505 extends into the installation chamber 401. The intermittent striking unit is a striking disc 6 coaxially disposed on the drive gear 501. Multiple striking parts 601 are provided around the circumference of the striking disc 6, and a transmission part 5051 is provided on the transmission rod 505. When the striking disc 6 rotates with the drive gear 501, its multiple striking parts 601 strike the transmission part 5051 in sequence during rotation. The transmission part 5051 transmits the striking force to the transmission rod 505, which in turn causes the screen 5032 to vibrate. A buffer spring 506 connects the screen 5032 to the outer frame 5031, which acts as a buffer to prevent the screen 5032 from vibrating excessively and causing damage, while also making the vibration of the screen 5032 more stable and continuous.

[0034] Working principle: The installation chamber 401 provides installation space for the drive gear 501 and driven gear 502, avoiding them from occupying space inside the distribution pipe 4 and ensuring smooth passage of materials and powders within the distribution pipe 4. When the drive gear 501 rotates, the coaxial striking disc 6 rotates synchronously. Multiple striking parts 601 on the striking disc 6 strike the transmission part 5051 on the transmission rod 505 in sequence during rotation, transmitting the impact force to the transmission rod 505, which in turn causes the screen 5032 to vibrate. The vibration of the screen 5032 allows materials and powders adhering to it to pass through more easily, preventing clogging and thus improving the screening effect.

[0035] In some examples, such as Figure 3 As shown, a flexible compensating pipe 7 connects the bottom surface of the outer frame 5031 to the inner wall of the distribution pipe 4, and the top opening of the flexible compensating pipe 7 is covered by a screen 5032. The flexible compensating pipe 7 can adapt to the swaying of the outer frame 5031 during the screening process. When the outer frame 5031 sways with the driven gear 502, the flexible compensating pipe 7 can bend and deform accordingly, always maintaining its connection with the outer frame 5031 and the distribution pipe 4. After the screen 5032 screens out the crushed material and powder, because the top opening of the flexible compensating pipe 7 is covered by the screen 5032, the crushed material and powder fall directly into the flexible compensating pipe 7 and are then guided into the distribution pipe 4, preventing material leakage into the installation chamber 401 or the return pipe 3.

[0036] The outer wall of the return pipe 3 is hinged with an inspection door 8, which faces the screening mechanism 5, allowing operators to directly inspect and maintain the screening mechanism 5. The bottom end of the return pipe 3 is connected to a return hopper 9, used to store leaked material to be returned to the rotary kiln 2. After being screened by the screening mechanism 5, qualified leaked material that is not screened out falls into the return hopper 9 through the return pipe 3. The return hopper 9 can be connected to conveying equipment such as a bucket elevator to transport the stored return material into the rotary kiln 2, realizing the recycling of qualified preheated balls.

[0037] The bottom end of the feed pipe 4 is connected to the bulk material bin 10, which is used to store the broken material and powder screened out of the leaking material. This facilitates centralized processing, avoids the direct entry into the rotary kiln 2 and the resulting ring formation problem, ensures the normal operation of the rotary kiln 2, and improves the production quality of the oxidized pellets.

[0038] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A screening device for returned oxidized pellets, used to receive and screen the material leaking from the interface between the chain grate (1) and the rotary kiln (2), characterized in that, It includes a return pipe (3), a distribution pipe (4), and a screening mechanism (5). The return pipe (3) is used to connect the interface between the chain grate machine (1) and the rotary kiln (2) to receive the leaked material. The distribution pipe (4) is located on the side wall of the return pipe (3) and is connected to the return pipe (3). The screening mechanism (5) is located at the connection between the distribution pipe (4) and the return pipe (3) and is used to screen out the broken material and powder in the leaked material and let it fall into the distribution pipe (4). The screening mechanism (5) includes a drive gear (501), a driven gear (502), a screening unit (503), and a return spring (504). The drive gear (501) and the driven gear (502) are rotatably disposed in the distribution pipe (4). The drive gear (501) is an incomplete gear and intermittently meshes with the driven gear (502). The screening unit (503) is connected to the driven gear (502) and can swing with the driven gear (502). The driven gear (502) can intermittently mesh with the drive gear (501) to drive the screening unit (503) to swing intermittently to an inclined state, so as to release the unscreened material on the screening unit (503) into the return pipe (3) for continued conveying; The return spring (504) acts on the inner wall of the distribution pipe (4) and the screening unit (503) at both ends respectively. After the driven gear (502) disengages from the drive gear (501), the return spring (504) can provide a force to make the screening unit (503) swing back to its original position.

2. The oxide pellet return screening device according to claim 1, characterized in that, The outer wall of the material distribution pipe (4) is provided with an installation chamber (401), the installation chamber (401) is connected to the material distribution pipe (4), and the drive gear (501) and the driven gear (502) are both located in the installation chamber (401).

3. The oxide pellet return screening device according to claim 2, characterized in that, The screening unit (503) includes an outer frame (5031) and a screen (5032). The outer frame (5031) is connected to the driven gear (502), and the screen (5032) is movably disposed within the screen (5032).

4. The oxide pellet return screening device according to claim 3, characterized in that, A transmission rod (505) is provided on the screen (5032), and an intermittent striking unit is provided in the installation chamber (401). The intermittent striking unit is used to intermittently strike the transmission rod (505) to make the screen (5032) vibrate.

5. The oxide pellet return screening device according to claim 4, characterized in that, The intermittent striking unit is a striking disc (6) coaxially mounted on the drive gear (501). The striking disc (6) has multiple striking parts (601) arranged around its circumference. The transmission rod (505) has a transmission part (5051). The multiple striking parts (601) can strike the transmission part (5051) in sequence under the drive of the rotating striking disc (6), so that the transmission rod (505) drives the screen (5032) to vibrate.

6. The oxide pellet return screening device according to claim 4, characterized in that, A buffer spring (506) is connected between the screen (5032) and the outer frame (5031).

7. The oxide pellet return screening device according to claim 3, characterized in that, A flexible compensation pipe (7) is connected between the bottom surface of the outer frame (5031) and the inner wall of the distribution pipe (4). The top opening of the flexible compensation pipe (7) covers the screen (5032) and is used to guide the broken materials and powders screened out by the screen (5032) into the distribution pipe (4).

8. The oxide pellet return screening device according to claim 1, characterized in that, The outer wall of the return pipe (3) is hinged with an inspection door (8), which faces the screening mechanism (5) to facilitate the inspection of the screening mechanism (5).

9. The oxide pellet return screening device according to claim 1, characterized in that, The bottom end of the return pipe (3) is connected to a return hopper (9), which is used to store the leaked material that needs to be returned to the rotary kiln (2).

10. The oxide pellet return screening device according to claim 1, characterized in that, The bottom end of the distribution pipe (4) is connected to a bulk material bin (10), which is used to store the broken material and powder screened out in the leakage.

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