A rotary hearth furnace stocker blade structure

Abstract

The utility model belongs to the rotary hearth furnace discharging machine blade structure in rotary hearth furnace technical field. Spiral blade (2) is arranged on discharging machine shaft (1), spiral blade (2) includes blade body (3), and blade body (3) end face sets up recess (4) according to gap, and ceramic block (5) is set up in recess (4), and one side of recess (4) is open structure (6), and open structure (6) welds sealing plate (7), and sealing plate (7) outside surface welds build -up layer (8), and build -up layer (8) is connected sealing plate (7) and blade body (3) simultaneously. Rotary hearth furnace discharging machine blade structure disclosed by the utility model, simple structure, effectively improve the wear resistance of spiral blade vulnerable position, help to break up the dust agglomerate on the hearth bottom surface simultaneously, thereby improve the service life of spiral blade, reduce the overall input cost.

Description

Technical Field

[0001] This utility model belongs to the field of rotary hearth furnace technology, and more specifically, it relates to a rotary hearth furnace discharge machine blade structure. Background Technology

[0002] Rotary hearth furnaces are crucial new environmental protection equipment in steel plants. Sludge, furnace ash, and other industrial pollutants generated during various steel production processes are briquetized and then sintered at continuous high temperatures (1100℃-1200℃) in the annular furnace. Simultaneously, the sintered spherical materials are discharged from the furnace via a spiral feeder. During operation, the end faces and side surfaces of the spiral blades of the rotary hearth furnace feeder, particularly the working surfaces near the end faces, experience friction and pressure from the high-temperature (110℃-1200℃) materials, making these areas prone to wear. Furthermore, as the end faces of the spiral blades wear down, the gap between the spiral blades and the furnace bottom increases, leading to a thicker accumulation of dust on the furnace bottom, which accelerates the wear and failure of the spiral blades. As critical and vulnerable components operating in the high-temperature furnace environment with flue gas and high-temperature pellets, the spiral blades must possess not only sufficient strength but also extremely high-temperature wear resistance and corrosion resistance. Currently, spiral blades are mostly made of heat-resistant and corrosion-resistant materials containing chromium, nickel, cobalt, tungsten, etc. However, the service life of spiral blades is still relatively low, with an average life of about 60 to 120 days, requiring frequent replacement and resulting in high costs.

[0003] Existing technology includes a designation titled "A Blade Structure for a Rotary Hearth Furnace Screw Feeder," with publication number CN113606947A. This technology relates to a blade structure for a rotary hearth furnace screw feeder, comprising a working layer and a base material fixed together by casting. The base material includes a welded portion fitted to the bottom surface of the working layer, and a support portion extending upward from the welded portion into the working layer. The welded portion and the support portion are integral, and the welded portion is welded to the tube shaft. This invention uses a composite casting structure for the blades, resulting in good weldability of the base material and ensuring the quality of the weld between the base material and the tube shaft, thus improving weld strength. The support portion, protected by the working layer, provides excellent support for the blades. The working layer, made of high-temperature resistant alloy steel, can effectively crush and discharge high-temperature materials from the rotary hearth furnace. This blade structure significantly reduces manufacturing costs while ensuring the wear resistance of the blades. This technology does not address the technical problems or solutions of this application. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a rotary hearth furnace discharge machine blade structure that, in view of the shortcomings of the prior art, provides a simple structure that effectively improves the wear resistance of the easily worn parts of the spiral blades by making local improvements to the easily worn parts of the spiral blades, while also helping to break up dust agglomerates on the bottom surface of the furnace, thereby increasing the service life of the spiral blades and reducing costs.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] This utility model relates to a blade structure for a rotary hearth furnace discharge machine. The discharge machine shaft is equipped with a spiral blade, which includes a blade body. The end face of the blade body is provided with grooves at intervals. A ceramic block is placed in the groove. One side of the groove is an open structure. A sealing plate is welded to the open structure. A weld overlay layer is welded to the outer side of the sealing plate. The weld overlay layer connects the sealing plate and the blade body.

[0007] Screw holes are provided on the end face of the blade body according to the gap, and ceramic screws are screwed into the screw holes. A weld overlay layer is welded on each side of the blade body.

[0008] The groove is an inverted trapezoidal structure with an outer area smaller than the bottom area.

[0009] The spiral blades are arranged to protrude along the mounting portion of the discharge machine shaft.

[0010] The weld overlay is a wear-resistant carbide layer formed by cobalt, tungsten carbide, and niobium carbide.

[0011] The ceramic screws mentioned are alumina ceramic screws or zirconia ceramic screws.

[0012] The blade body is also welded with a weld overlay layer on the other side surface.

[0013] The discharge shaft is mounted on the rotary hearth furnace body, and the spiral blades are located inside the furnace chamber.

[0014] Each end of the discharge shaft is provided with a bearing seat outside the rotary hearth furnace body. The bearing seats are mounted on a support base. Each end of the discharge shaft is also provided with a sprocket outside the rotary hearth furnace body. The sprocket is connected to the drive teeth of the motor through a chain.

[0015] The spiral blades are made of nickel-based austenitic heat-resistant alloy.

[0016] The sealing plate is made of high-temperature resistant stainless steel.

[0017] The working principle and beneficial effects of this utility model are as follows:

[0018] The rotary hearth furnace discharge mechanism blade structure of this utility model is configured such that the discharge mechanism shaft is mounted on the rotary hearth furnace body. Sintered spherical material is located at the base of the rotary hearth furnace body. The material is discharged from the furnace chamber by the rotation of the discharge mechanism shaft, which drives the spiral blades to act on the spherical material. The spiral blades mounted on the discharge mechanism shaft are located inside the furnace chamber. Each spiral blade includes a blade body made of a nickel-based austenitic heat-resistant alloy, exhibiting good hardness and wear resistance. When making localized improvements to the easily worn parts of a propeller blade, grooves are machined into the end face of the blade body according to the clearance during blade body machining. An opening structure is created on one side of the groove. Further machining involves embedding a ceramic block within the groove. A sealing plate is welded to the opening structure, securing the ceramic block from the side. Screws can also be installed between the sealing plate and the ceramic block, vertically fixed to the sealing plate, with one end extending into a hole near the side of the ceramic block. Due to the inverted trapezoidal structure of the groove and ceramic block (larger inside than outside) and the fixing of the sealing plate, the ceramic block is reliably fixed within the groove. A weld overlay layer is welded to the outer side of the sealing plate, connecting both the sealing plate and the blade body. The weld overlay layer provides shielding and protection for the sealing plate and is welded to both the sealing plate and the blade body, securing the ceramic block. The weld overlay layer is located on the working surface near the end face, effectively improving the wear resistance of this working area. The ceramic material of the ceramic block provides good wear resistance, effectively improving the wear resistance of the blade body's end face. The ceramic block improves the wear resistance of a specific part of the end face. Therefore, when the spiral blades are first replaced, the outer surface of the ceramic block and the end face of the blade body are on the same plane. At this time, the gap between the end face of the blade body and the rotary hearth furnace base is small. When the spiral blades rotate, industrial materials are discharged from the furnace, and the end face and side face of the blade body break up any agglomerates of material at the rotary hearth furnace base. After the spiral blades have been used for a period of time, the metal parts of the blade body end face wear down, while the ceramic block parts, with their good wear resistance, experience minimal wear. A toothed structure forms between the blade part of the blade body end face and the ceramic block. The gap between the ceramic block and the bottom of the furnace remains essentially unchanged. During the rotation of the spiral blades, the toothed structure can still break up agglomerates, preventing the formation of agglomerates at the bottom of the furnace and avoiding any impact on the spiral blades' ability to discharge industrial materials from the furnace. Attached Figure Description

[0019] The following is a brief explanation of the contents depicted in the accompanying drawings and the markings therein:

[0020] Figure 1 This is a schematic diagram of the blade structure of the rotary hearth furnace discharge machine according to the present invention;

[0021] Figure 2 This is a schematic diagram of the blade structure of the rotary hearth furnace discharge machine according to the present invention;

[0022] Figure 3This is a schematic diagram of the structure of the rotary hearth furnace discharge machine blade structure according to Embodiment 1 of the present invention;

[0023] Figure 4 This is a partial structural diagram of the groove in the blade structure of the rotary hearth furnace discharge machine according to the present invention;

[0024] Figure 5 This is a top view schematic diagram of Embodiment 1 of the rotary hearth furnace discharge machine blade structure of this utility model;

[0025] Figure 6 This is a cross-sectional view of Embodiment 1 of the rotary hearth furnace discharge machine blade structure of this utility model;

[0026] Figure 7 This is a schematic diagram of the structure of the rotary hearth furnace discharge machine blade structure of Embodiment 2 of the present invention;

[0027] Figure 8 This is a cross-sectional view of Embodiment 2 of the rotary hearth furnace discharge machine blade structure of this utility model;

[0028] The labels in the attached diagram are as follows: 1. Feeder shaft; 2. Spiral blade; 3. Blade body; 4. Groove; 5. Ceramic block; 6. Opening structure; 7. Sealing plate; 8. Weld overlay layer; 9. Screw hole; 10. Ceramic screw; 11. Rotary hearth furnace body; 12. Bearing seat; 13. Support seat; 14. Sprocket; 15. Chain; 16. Motor; 17. Drive gear; 18. Mounting position; 19. Furnace chamber; 20. Rotary hearth furnace base. Detailed Implementation

[0029] The following description, with reference to the accompanying drawings, provides a more detailed explanation of the specific embodiments of this utility model, including the shape and structure of each component, the relative positions and connections between the parts, the functions and working principles of each part:

[0030] As attached Figure 1 -Appendix Figure 6As shown, this utility model is a rotary hearth furnace discharge machine blade structure. As an embodiment 1, a spiral blade 2 is provided on the discharge machine shaft 1. The spiral blade 2 includes a blade body 3. Grooves 4 are provided at intervals on the end face of the blade body 3. Ceramic blocks 5 are placed in the grooves 4. One side of the groove 4 has an opening structure 6. A sealing plate 7 is welded to the opening structure 6. A weld overlay layer 8 is welded to the outer side of the sealing plate 7, and the weld overlay layer 8 connects the sealing plate 7 and the blade body 3. The above structure addresses the shortcomings of the prior art by proposing an improved technical solution. In this configuration, the discharge machine shaft 1 is installed on the rotary hearth furnace body 11. Sintered spherical material is located at the rotary hearth furnace base 20 inside the rotary hearth furnace body 11. The spiral blade 2, driven by the rotation of the discharge machine shaft 1, acts on the spherical material and discharges it from the furnace chamber. The spiral blade 2 on the discharge machine shaft 1 is located inside the furnace chamber 19. The spiral blade 2 includes a blade body 3, which is made of a nickel-based austenitic heat-resistant alloy, exhibiting good hardness and wear resistance. When making local improvements to the easily worn parts of the spiral blade, a groove 4 is machined at the gap on the end face of the blade body 3 during the machining of the blade body 3. At the same time, an opening structure is set on one side of the groove 4 of the blade body 3. Then, during further machining, a ceramic block 5 is fixedly inserted into the groove 4. A sealing plate 7 is welded at the position of the opening structure 6. The sealing plate 7 fixes the ceramic block 5 from the side. Screws can also be set between the sealing plate 7 and the ceramic block 5. The screws are vertically fixed to the sealing plate 7, and one end of the screw extends into the hole near the side of the ceramic block 5. Because the groove 4 and the ceramic block 5 are inverted trapezoidal structures (larger inside and smaller outside) and the sealing plate 7 is fixed, the ceramic block 5 is reliably fixed inside the groove 4. A weld overlay layer 8 is welded to the outer side of the sealing plate 7. The weld overlay layer 8 connects the sealing plate 7 and the blade body 3. The weld overlay layer 8 provides shielding and protection for the sealing plate 7. Welding with the sealing plate 7 and the blade body 3 achieves a fixed connection of the ceramic block 5. At the same time, the weld overlay layer 8 is located on the working surface near the end face on the side, which effectively improves the wear resistance of this working part. The ceramic material of ceramic block 5 provides excellent wear resistance, effectively improving the wear resistance of the end face of blade body 3. Ceramic block 5 improves the wear resistance of a specific portion of the end face. Therefore, when the spiral blade 2 is newly replaced, the outer surface of ceramic block 5 and the end face of blade body 3 are on the same plane. At this time, the gap between the end face of blade body 3 and the rotary hearth furnace base 20 is small. When the spiral blade 2 rotates, industrial materials are discharged from the furnace chamber 19, and the end face and side of blade body 3 break up any agglomerates in the rotary hearth furnace base 20. After a period of use, the metal parts of the end face of blade body 3 wear down, but the ceramic block 5, with its good wear resistance, remains largely unaffected. A toothed structure forms between the blade part of the end face of blade body 3 and ceramic block 5. The gap between ceramic block 5 and the bottom of furnace chamber 19 remains essentially unchanged. During the rotation of the spiral blade 2, the toothed structure can still break up agglomerates, preventing agglomeration at the bottom of furnace chamber 19 and avoiding any impact on the spiral blade 2's ability to discharge industrial materials from furnace chamber 19.The rotary hearth furnace discharge machine blade structure described in this utility model has a simple structure, effectively improves the wear resistance of vulnerable parts of the spiral blades, and helps to break up dust agglomerates on the bottom surface of the furnace, thereby increasing the service life of the spiral blades and reducing the overall investment cost.

[0031] As an example 2, see attached Figure 1 Appendix Figure 2 Appendix Figure 7 -Appendix Figure 8 As shown, a spiral blade 2 is mounted on the feeder shaft 1. The spiral blade 2 includes a blade body 3. Screw holes 9 are spaced apart on the end face of the blade body 3, and ceramic screws 10 are screwed into the screw holes 9. A weld overlay layer 8 is welded to each side of the blade body 3. The above structure is basically the same as the principle of the embodiment. The ceramic screw 10 is equivalent to the ceramic block in embodiment 1. The ceramic screw is screwed into the screw hole to achieve a fixed connection. The weld overlay layer 8 is located on the working surface near the end face, improving the wear resistance of this working part. The ceramic screw 10 has good wear resistance, effectively improving the wear resistance of the end face of the blade body 3. The ceramic screw 10 improves the wear resistance of a portion of the end face. Therefore, when the spiral blade is newly replaced, the outer surface of the ceramic screw 10 and the end face of the blade body 3 are on the same plane. At this time, the gap between the end face of the blade body 3 and the bottom surface of the furnace 19 is small. When the spiral blade rotates, industrial materials are reliably discharged from the furnace 19, and the end face and side face of the blade body can break up any agglomerates on the bottom surface of the furnace 19. After the helical blade has been used for a period of time, the metal parts on the end face of the blade body 3 wear down, while the ceramic screw 10 has good wear resistance and hardly wears down. This improves the overall wear resistance of the helical blade. At this time, a toothed structure is formed between the blade part on the end face of the blade body 3 and the ceramic screw 10. The gap between the ceramic screw 10 and the bottom of the furnace 19 remains basically unchanged. During the rotation of the helical blade, the toothed structure can still break up the clumps, preventing the formation of clumps at the bottom of the furnace 19 and avoiding the impact of clumps on the helical blade.

[0032] The groove 4 is an inverted trapezoidal structure with an outer area smaller than the bottom area. Similarly, the ceramic block 5 also has an inverted trapezoidal structure, ensuring reliable mounting and a stable arrangement.

[0033] The spiral blade 2 is protruding along the mounting portion 18 of the discharge shaft 1. In the above structure, the spiral blade is arranged in a spiral pattern outside the mounting portion and located inside the furnace.

[0034] The aforementioned weld overlay layer 8 is a carbide wear-resistant layer formed from cobalt, tungsten carbide, and niobium carbide. In this structure, the weld overlay layer is fixed to the corresponding location through welding, thereby improving the wear resistance of that location.

[0035] The ceramic screw 10 is an alumina ceramic screw or a zirconia ceramic screw. The ceramic block 5 is an alumina ceramic block or a zirconia ceramic block. The above structure provides good overall wear resistance.

[0036] A weld overlay layer 8 is also welded to the other side surface of the blade body 3. In the above structure, a weld overlay layer is provided on the working surface of the side of the blade body near the end face to improve the wear resistance of this part.

[0037] The discharge shaft 1 is mounted on the rotary hearth furnace body 11, and the spiral blades 2 are located inside the furnace chamber 19. Each end of the discharge shaft 1, located outside the rotary hearth furnace body 11, is provided with a bearing seat 12, which is mounted on a support base 13. A sprocket 14 is also provided at each end of the discharge shaft 1, located outside the rotary hearth furnace body 11. The sprocket 14 is connected to the drive teeth 17 of the motor 16 via a chain 15. With this structure, when the motor rotates, it drives the discharge shaft to rotate, thus achieving material discharge.

[0038] The spiral blade 2 is made of a nickel-based austenitic heat-resistant alloy. The sealing plate 7 is made of high-temperature resistant stainless steel. The above structure provides good wear resistance for both the spiral blade and the sealing plate.

[0039] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A blade structure for a rotary hearth furnace discharge machine, characterized in that: A spiral blade (2) is provided on the feeder shaft (1). The spiral blade (2) includes a blade body (3). The end face of the blade body (3) is provided with a groove (4) with a gap. A ceramic block (5) is provided in the groove (4). One side of the groove (4) is an open structure (6). The open structure (6) is welded with a sealing plate (7). The outer side of the sealing plate (7) is welded with a weld overlay layer (8). The weld overlay layer (8) connects the sealing plate (7) and the blade body (3) at the same time.

2. The blade structure of the rotary hearth furnace discharge machine according to claim 1, characterized in that: The blade body (3) has screw holes (9) set at the gap on the end face, and ceramic screws (10) are screwed into the screw holes (9). The blade body (3) has a weld overlay layer (8) welded on each side.

3. The blade structure of the rotary hearth furnace discharge machine according to claim 1 or 2, characterized in that: The groove (4) is an inverted trapezoidal structure with an outer area smaller than the bottom area.

4. The blade structure of the rotary hearth furnace discharge machine according to claim 1 or 2, characterized in that: The spiral blade (2) is raised along the mounting part (18) of the feeder shaft (1).

5. The blade structure of the rotary hearth furnace discharge machine according to claim 2, characterized in that: The ceramic screw (10) is an alumina ceramic screw or a zirconia ceramic screw.

6. The blade structure of the rotary hearth furnace discharge machine according to claim 2, characterized in that: The blade body (3) is also welded with a weld overlay layer (8) on the other side surface.

7. The blade structure of the rotary hearth furnace discharge machine according to claim 1 or 2, characterized in that: The discharge shaft (1) is installed on the rotary hearth furnace body (11), and the spiral blades (2) are located inside the furnace chamber (19).

8. The blade structure of the rotary hearth furnace discharge machine according to claim 7, characterized in that: Each end of the discharge shaft (1) is provided with a bearing seat (12) outside the rotary hearth furnace body (11). The bearing seat (12) is mounted on the support seat (13). Each end of the discharge shaft (1) is also provided with a sprocket (14) outside the rotary hearth furnace body (11). The sprocket (14) is connected to the drive teeth (17) of the motor (16) through a chain (15).

9. The blade structure of the rotary hearth furnace discharge machine according to claim 1 or 2, characterized in that: The spiral blade (2) is made of nickel-based austenitic heat-resistant alloy.

10. The blade structure of the rotary hearth furnace discharge machine according to claim 1 or 2, characterized in that: The sealing plate (7) is made of high-temperature resistant stainless steel.

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