Metallurgical furnaces and their binding systems

Abstract

A binding system for a metallurgical furnace. The metallurgical furnace includes a furnace shell (10), which has a plurality of shell units (11) extending in a vertical direction and adjacent to each other in a circumferential direction. The binding system includes: an elastic device, which is arranged on the outer peripheral surface of the furnace shell (10) and is used to apply an elastic constraint force in a radial direction to the furnace shell (10); and a limiting device, which is distributed between the vertical seams (12) between the adjacent shell units and does not limit the radial contraction of the furnace shell (10), but only limits the radial expansion of the furnace shell (10). According to the technical solution of the present application, there is no need for the intervention of an operator to adjust the length of the steel cable, thereby realizing a fully automatic binding system.

Description

Technical Field

[0001] The present application relates to the field of metallurgy, and more particularly, to a metallurgical furnace and a binding system thereof. Background Art

[0002] The basic structure of a metallurgical furnace consists of a furnace shell, a furnace chamber defined by the shell and used to house electrodes, and a lid that seals the top of the shell. Because metallurgical furnaces operate at very high temperatures, the shell tends to expand radially outward at high temperatures and contract inward at low temperatures due to thermal expansion and contraction. To compensate for this thermal expansion and contraction while ensuring the overall structural strength of the shell, a binding system is typically installed on the outside of the shell.

[0003] For example, the inventors of this application previously proposed a binding system in WO 2015089622 A1. The binding system primarily comprises steel cables wrapped around the furnace shell, each with a tension spring attached at its ends. When the radial outward expansion of the furnace shell exceeds the capacity of the tension spring, the length of the steel cables can be adjusted. When the radial outward expansion of the furnace shell does not exceed the maximum elongation of the spring, the binding system automatically tightens the furnace shell.

[0004] Although this binding system can automatically realize the elastic binding function of the furnace shell within the bearing capacity of the spring to cater to its radial expansion and contraction, it still requires manual adjustment by the operator when the movement of the furnace shell exceeds the bearing capacity of the spring.

[0005] Therefore, how to provide a binding solution that does not require operator intervention to adjust the length of the steel cable has become a technical problem that needs to be solved in this field. Summary of the Invention

[0006] In view of this, the present application proposes a binding system for a metallurgical furnace, which does not require manual intervention by an operator to adjust the length of the steel cable, thereby realizing a fully automatic binding system.

[0007] According to the present application, a binding system for a metallurgical furnace is proposed. The metallurgical furnace includes a furnace shell having a plurality of shell units extending vertically and spliced ​​adjacent to each other in the circumferential direction. The binding system comprises: an elastic device disposed on the outer circumference of the furnace shell for applying a radial elastic constraint force to the furnace shell; and a limiting device disposed between the vertical joints between adjacent shell units. The limiting device does not restrict radial contraction of the furnace shell, but only radial expansion. The limiting device prevents excessive expansion of the furnace shell from exceeding the limit of the elastic device and causing elastic fatigue.

[0008] Preferably, the limiting device includes: a first limiting protrusion, which protrudes radially outward on the outer peripheral surface of a shell unit; a second limiting protrusion, which protrudes radially outward on the outer peripheral surface of another adjacent shell unit, the first limiting protrusion and the second limiting protrusion are adjacent to each other and are respectively located on both sides of the vertical seam between the shell units; and a limiting member, which is installed on the first limiting protrusion and the second limiting protrusion, and is used to limit the relative distance between the first limiting protrusion and the second limiting protrusion in the circumferential direction.

[0009] Preferably, the limiting member is fixedly arranged relative to one of the first limiting protrusion and the second limiting protrusion, and is used to limit the movement range of the other of the first limiting protrusion and the second limiting protrusion in the circumferential direction.

[0010] Preferably, the limiting member is hung on the first limiting protrusion and the second limiting protrusion, and is not fixed relative to the shell unit.

[0011] Preferably, the limiting member includes: a hanging portion, which is located above the first limiting protrusion and the second limiting protrusion and supported by the first limiting protrusion and the second limiting protrusion; and a first stop portion and a second stop portion, which are opposite to each other in the circumferential direction and fixedly connected by the hanging portion, and the first stop portion and the second stop portion are respectively located on the circumferential outside of the first limiting protrusion and the second limiting protrusion in the circumferential direction, and are used to stop the movement of the first limiting protrusion and the second limiting protrusion in the circumferential direction.

[0012] Preferably, the limiting member includes a cover plate, which is fixedly connected to the first stop portion and the second stop portion and is located radially outside the first limiting protrusion and the second limiting protrusion.

[0013] Preferably, the limiting member includes: a guide portion, which is fixedly connected to the first stop portion and the second stop portion and is located below the first limiting protrusion and the second limiting protrusion.

[0014] Preferably, a guide groove for guiding the first limiting protrusion and the second limiting protrusion to move in the circumferential direction is formed between the hanging portion and the guide portion.

[0015] Preferably, the hanging portion, the first stop portion, the second stop portion, the cover plate and the guide portion are formed as an integrally manufactured component.

[0016] Preferably, an anti-falling structure is provided between the hanging portion and the first limiting protrusion and the second limiting protrusion.

[0017] Preferably, the horizontal cross-section of the vertical seam between the adjacent shell elements is in the shape of a straight line or a broken line.

[0018] Preferably, the elastic device includes: a first fixed block, which is fixedly arranged on the outer peripheral surface of a shell unit; a second fixed block, which is fixedly arranged on the outer peripheral surface of another adjacent shell unit, the first fixed block and the second fixed block are adjacent to each other and are respectively located on both sides of the vertical seam between the shell units; and a spring member, which is a tension spring and is connected between the first fixed block and the second fixed block.

[0019] Preferably, the elastic device includes: a tension transmission element, which is arranged end to end on the outer peripheral surface of the furnace shell along the circumferential direction, and a connecting seat is provided at both ends of the tension transmission element; and a spring member, which is a tension spring and is connected between two adjacent connecting seats.

[0020] Preferably, the tension transmission element may be a steel cable or an arc-shaped connecting piece.

[0021] Preferably, a support seat is provided on the outer circumferential surface of the shell unit, and the tension transmission element is supported radially outward and in a positional manner by the support seat.

[0022] Preferably, the support seat is provided with a rotatable support shaft, and the tension transfer element is rotatably supported by the support shaft.

[0023] The present application also provides a metallurgical furnace having the above-mentioned binding system.

[0024] According to the technical solution of the present application, a plurality of shell units adjacent to each other in the circumferential direction form the furnace shell of a metallurgical furnace, and an elastic restraining force in a radial direction is applied to the furnace shell by an elastic device. When the furnace shell is radially outward, the limiting devices distributed between the vertical seams between adjacent shell units limit the radial expansion of the furnace shell when the limit of the bearing capacity of the elastic element is reached, thereby maintaining the restraining capacity of the elastic device without the intervention of an operator, thereby realizing a fully automatic binding system.

[0025] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which constitute part of this application, are used to provide a further understanding of the application, and the exemplary embodiments of the application and their descriptions are used to explain the application. In the accompanying drawings:

[0027] Figure 1 A schematic diagram of a metallurgical furnace and its binding system according to a preferred embodiment of the present application;

[0028] Figures 2a to 2c for Figure 1Enlarged views of different horizontal sections of the metallurgical furnace and its binding system at the locations of its stoppers are shown;

[0029] Figure 3 for Figure 1 A perspective schematic diagram of a preferred embodiment of a metallurgical furnace and a limiting member of a binding system thereof is shown;

[0030] Figure 4 for Figure 1 An enlarged top view of a metallurgical furnace and its binding system shown with one of its elastic devices in position;

[0031] Figure 5 A schematic diagram of a metallurgical furnace and its binding system according to another preferred embodiment of the present application;

[0032] Figure 6 for Figure 5 A schematic diagram of another elastic device for a metallurgical furnace and its binding system is shown;

[0033] Figure 7 for Figure 5 An enlarged top view of a metallurgical furnace and its binding system shown in the position of its supporting base;

[0034] Figure 8 for Figure 7 AA section view;

[0035] Figure 9 This is an enlarged top view of a vertical seam between adjacent shell units of a metallurgical furnace according to a preferred embodiment of the present application. DETAILED DESCRIPTION

[0036] The technical solution of the present application will be described in detail below with reference to the accompanying drawings and in combination with the implementation methods.

[0037] When a metallurgical furnace is operating, temperature fluctuations within the furnace chamber cause the furnace body to expand. Conventional solutions, such as those described in WO2015089622 A1, limit this expansion using steel cables surrounding the furnace body and springs connecting the cables. However, if the furnace body expansion exceeds the elastic elongation of the springs, manual adjustment of the cable length is required, making a fully automated furnace binding method difficult to achieve. In light of this, the present application provides a metallurgical furnace binding system based on a segmented furnace shell.

[0038] like Figure 1As shown, the metallurgical furnace includes a furnace shell 10, in which a furnace wall (not shown) for forming a furnace chamber of the metallurgical furnace is provided. In the present application, there is no limitation on the structure of the furnace wall and the furnace chamber, and a conventional existing structural method can be adopted. For example, the technical features of WO 2015089622A1 previously proposed by the inventor of the present application can be incorporated into the specification of the present application. In order to adapt to the thermal expansion and contraction of the structure due to temperature changes during the operation of the metallurgical furnace, the furnace shell 10 has a plurality of shell units 11 extending in the vertical direction and adjacent to each other in the circumferential direction. In order to control the inward and outward changes of the shell unit 11 in the radial direction, the present application utilizes the binding system of the metallurgical furnace to realize the automatic constraint and control of the furnace shell 10, which can be achieved under normal working conditions with almost no manual intervention of the operator.

[0039] The binding system includes: an elastic device and a limiting device. The elastic device is arranged on the outer circumference of the furnace shell 10, and is used to apply an elastic constraint force in the radial direction (especially inward) to the furnace shell 10, so as to maintain the overall integrity of the shell units 11 of the furnace shell 10. Each elastic device can be extended to a maximum length based on its load-bearing capacity. The number of elastic devices required to meet the expected total extension of the circumferential length of the furnace shell determines the number of shell units required. In order to ensure that the extension of each elastic device does not exceed its load-bearing capacity, a limiting device is provided to limit the maximum extension of the elastic device. The limiting device is distributed between the vertical seams 12 between adjacent shell units 11, and does not limit the radial contraction of the furnace shell 10, but only limits the radial expansion of the furnace shell 10. That is, when the metallurgical furnace is in a high-temperature working state and has a tendency to expand outward, the furnace shell will automatically be restricted by the limiting device and will not exceed the limit of radial outward expansion.

[0040] Specifically, when the metallurgical furnace expands due to heat, the multiple shell units 11 that are spliced ​​adjacent to each other will move away from each other. At this time, the elastic device of the binding system acts between the multiple shell units 11, causing them to generate a restraining force on the metallurgical furnace, thereby achieving the effect of limiting the expansion of the metallurgical furnace. The role of the limiting device is, on the one hand, to prevent the expansion of one or several vertical seams 12 between the shell units 11 from being too large, and on the other hand, to provide a limit to the overall expansion of the furnace shell 10, limiting the maximum expansion range of the furnace shell 10 to within the maximum elastic floating amount of the elastic device, thereby effectively improving the service life of the binding system, allowing the binding system to work within the maximum elastic floating range of the elastic device, and reliably maintaining the restraining capacity of the elastic device without the intervention of an operator, thereby realizing a fully automatic binding system. Moreover, in the technical solution of the present application, the elastic device and the limiting device are set separately, thereby avoiding the traditional limitation of using steel cables to achieve elastic limiting, such as in WO 2015089622 A1, and can achieve both the elastic force to limit radial expansion and the limitation of the maximum radial expansion degree.

[0041] The limiting device can be a rope, a metal chain or a lock that only limits the maximum distance between adjacent shell units 11. Preferably, the limiting device has a structure that is easy to disassemble and maintain. As a preferred embodiment, Figure 2a 、 Figure 2b 、 Figure 2c and Figure 3 As shown, the limiting device is basically a rectangular ring with two stoppers. For example, the first stopper 21 is inserted into a hole drilled in one shell unit. The hole may or may not penetrate the furnace shell. The stopper 21 protrudes radially outward from the outer peripheral surface of the furnace shell. The second stopper 22 is respectively installed on the adjacent furnace shells across the gap 12. A groove is formed in the middle of the rectangular ring 23. The width of the groove allows the stopper to pass through and the groove has the following shape: Figure 2b and Figure 2c The two ends of the semicircle shown or Figure 3 The square ends are shown. The total length of the slot allows for the maximum expansion of the furnace shell. Initially, the shell elements are held tightly together with no substantial gap. A rectangular ring 23 is positioned on the furnace shell surface via two stops 21 and 22. A gap exists between the stops and the sides of the rectangular ring 23, defining the maximum range of movement of the shell elements as the metallurgical furnace heats and expands, i.e., the maximum gap 12.

[0042] In the binding system of the metallurgical furnace of the present application, the horizontal cross section of the vertical seam 12 between adjacent shell units 11 can be a straight line ( Figure 2a ) or broken line ( Figure 2b and Figure 2c ). The straight vertical seam 12 may be perpendicular or non-perpendicular to the circumferential extension direction of the shell unit 11. The broken line shape is preferably n-shaped, Figure 9 The Z-shape or other zigzag shape shown here enhances the sealing between adjacent shell elements 11 in the spliced ​​state and further improves the reliability of the binding system. Furthermore, in the preferred embodiment of a curved zigzag shape, the sealing between the shell elements 11 is maintained to at least a certain degree when the shell elements 11 expand radially outward. A lubricant may be provided between the two surfaces to improve the sealing.

[0043] According to the binding system for a metallurgical furnace of any of the foregoing embodiments of the present application, the elastic device may be an elastic device used in the prior art, or preferably a simpler elastic device that does not require manual intervention and adjustment.

[0044] like Figure 1 and Figure 4 As shown, the elastic device of the present application preferably includes a first fixed block 41, a second fixed block 42 and a spring member 43 of a tension spring type. The first fixed block 41 is fixedly arranged on the outer peripheral surface of one shell unit 11; the second fixed block 42 is fixedly arranged on the outer peripheral surface of another adjacent shell unit 11, and the first fixed block 41 and the second fixed block 42 are adjacent to each other and are respectively located on both sides of the vertical seam 12 between the shell units 11; the spring member 43 is connected between the first fixed block 41 and the second fixed block 42, and provides an elastic force between adjacent shell units 11 to bring them closer to each other. The spring member 43 can be an elastic member of a non-metallic elastic material that can meet the elastic force requirements, or preferably a tension spring of a metal material. As shown Figure 4 As shown, the first fixing block 41 and the second fixing block 42 are preferably mounted on the shell unit 11 by a removable mounting method (such as threaded mounting, rivet mounting, snap mounting, or slot mounting), thereby facilitating replacement or maintenance of various components of the binding system. Any two adjacent shell units 11 are provided with at least one elastic device along the extension direction of their vertical seam 12, and preferably multiple elastic devices are evenly distributed.

[0045] According to another embodiment of the present application, the elastic device can realize the elastic restraint function of the furnace shell 10 without being installed on the furnace shell 10. Figure 5 and Figure 6As shown, the elastic device includes a tension transmission element 50 and a spring member 52. The tension transmission elements 50 are arranged end-to-end along the outer circumference of the furnace shell 10. Connecting seats 51 are provided at each end of the tension transmission element 50. The tension transmission element 50 can be a non-elastic rope made of metal or non-metallic material, preferably a steel cable or an arc-shaped connector (such as an arc-shaped steel member). The spring member 52 is connected between two adjacent connecting seats 51. The spring member 52 can be an elastic member made of a non-metallic elastic material that meets the elastic force requirements, or preferably a metal tension spring. The elastic device surrounding the furnace shell 10 can include at least one tension transmission element 50 and at least one spring member 52. Preferably, multiple tension transmission elements 50 and multiple spring members 52 are connected end-to-end via the connecting seats 51 to form an elastic device surrounding the furnace shell 10. The number of spring members 52 determines the number of shell units based on their load-bearing capacity. Preferably, a plurality of elastic devices are provided in the vertical direction to apply uniform elastic restraining force to the furnace shell 10 at different heights.

[0046] In order to reduce or avoid contact wear between the tension transfer element 50 and the shell unit 11 of the furnace shell 10, a plurality of support seats 53 are preferably provided on the outer peripheral surface of the shell unit 11, and the tension transfer element 50 is radially outwardly and positionally supported by the support seats 53, so that the tension transfer element 50 is kept isolated from the shell unit 11 in the radial direction of the furnace shell 10. The positioning support of the tension transfer element 50 by the support seats is mainly intended to ensure that the tension transfer element 50 is evenly distributed on the outer peripheral surface of the furnace shell in the circumferential direction of the furnace shell. For example, grooves may be provided on the support seats for arranging steel cables, so that the steel cables can be supported from falling when no force is applied during the installation process. Preferably, as Figure 5 、 Figure 7 and Figure 8 As shown, the support seat 53 is provided with a rotatable support shaft 54 ​​, and the tension transmission element 50 is supported by the support shaft 54 ​​, thereby reducing or avoiding contact wear between the tension transmission element 50 and the support seat 53 , and improving the service life of the tension transmission element 50 .

[0047] In the metallurgical furnace and its binding system provided in the present application, the elastic device of any of the above embodiments can be used to provide elastic restraint force on the furnace shell 10, and the elastic devices of the above embodiments can also be combined and applied to the same furnace shell 10. According to the metallurgical furnace and its binding system of the preferred embodiment, the shell units 11 forming the furnace shell 10 can be arranged in sections in the vertical direction in addition to being adjacent to each other in the circumferential direction. Therefore, if Figure 1As shown, different elastic devices and / or limiting devices are used on the shell elements 11 of different vertical segments according to the different expansion conditions when the metallurgical furnace is operating at different heights, thereby improving the applicability of the binding system to different metallurgical furnaces. The metallurgical furnace and its binding system of the present application use elastic devices and / or limiting devices of different embodiments according to actual operating conditions, and can maintain the automatic binding and restraint capability of the furnace body expansion without operator intervention.

[0048] The preferred embodiments of the present application are described in detail above. However, the present application is not limited to the specific details of the above embodiments. Within the technical concept of the present application, various simple modifications can be made to the technical solution of the present application, and these simple modifications all fall within the scope of protection of the present application.

[0049] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner unless there is any contradiction. In order to avoid unnecessary repetition, this application will not further describe various possible combinations.

[0050] In addition, the various implementation methods of the present application may be arbitrarily combined, and as long as they do not violate the concept of the present application, they should also be regarded as the contents disclosed in the present application.

Claims

1. A binding system for a metallurgical furnace, the metallurgical furnace comprising a furnace shell (10), the furnace shell (10) having a plurality of shell units (11) extending in a vertical direction and spliced ​​adjacent to each other in a circumferential direction, The binding system includes: an elastic device, which is arranged on the outer peripheral surface of the furnace shell (10) and is used to apply an elastic constraint force in a radial direction to the furnace shell (10), the elastic device comprising a tension transmission element (50), the tension transmission element (50) being arranged end to end on the outer peripheral surface of the furnace shell (10) along the circumferential direction, and in order to reduce or avoid contact wear between the tension transmission element (50) and the shell unit (11) of the furnace shell (10), a support seat (53) is provided on the outer peripheral surface of the shell unit (11), the tension transmission element (50) is radially outwardly and positionally supported by the support seat (53), the support seat (53) is provided with a rotatable support shaft (54), the tension transmission element (50) is rotatably supported by the support shaft (54), so that the tension transmission element (50) is kept isolated from the shell unit (11) in the radial direction of the furnace shell (10); and A limiting device is distributed and arranged at the vertical seams (12) between the adjacent shell units (11), and does not limit the radial contraction of the furnace shell (10), but only limits the radial expansion of the furnace shell (10).

2. The binding system for a metallurgical furnace according to claim 1, wherein: The limiting device includes: a first limiting protrusion (21), the first limiting protrusion (21) protruding radially outward from the outer peripheral surface of a shell unit (11); a second limiting protrusion (22), the second limiting protrusion (22) protruding radially outward from the outer peripheral surface of another adjacent shell unit (11), the first limiting protrusion (21) and the second limiting protrusion (22) being adjacent to each other and respectively located on both sides of the vertical seam (12) between the shell units (11); and A limiting member (23) is mounted on the first limiting protrusion (21) and the second limiting protrusion (22) and is used to limit the relative distance between the first limiting protrusion (21) and the second limiting protrusion (22) in the circumferential direction.

3. The binding system for a metallurgical furnace according to claim 2, wherein: The limiting member (23) is fixedly arranged relative to one of the first limiting protrusion (21) and the second limiting protrusion (22), and is used to limit the movement range of the other of the first limiting protrusion (21) and the second limiting protrusion (22) in the circumferential direction.

4. The binding system for a metallurgical furnace according to claim 2, wherein: The limiting member (23) is hung on the first limiting protrusion (21) and the second limiting protrusion (22), and is not fixed relative to the shell unit (11).

5. The binding system for a metallurgical furnace according to claim 4, wherein: The limiting member (23) includes: a hanging portion (233), the hanging portion (233) being located above the first limiting protrusion (21) and the second limiting protrusion (22), and being supported by the first limiting protrusion (21) and the second limiting protrusion (22); and A first stop portion (231) and a second stop portion (232) are provided, the first stop portion (231) and the second stop portion (232) being opposite to each other in the circumferential direction and fixedly connected by the hanging portion (233), the first stop portion (231) and the second stop portion (232) being respectively located on the circumferential outside of the first limiting protrusion (21) and the second limiting protrusion (22) in the circumferential direction, and being used to stop the first limiting protrusion (21) and the second limiting protrusion (22) from moving in the circumferential direction.

6. The binding system for a metallurgical furnace according to claim 5, wherein: The limiting member (23) comprises a cover plate (234), the cover plate (234) being fixedly connected to the first stop portion (231) and the second stop portion (232), and being located radially outside the first limiting protrusion (21) and the second limiting protrusion (22).

7. The binding system for a metallurgical furnace according to claim 6, wherein: The limiting member (23) comprises a guide portion (235), the guide portion (235) being fixedly connected to the first stop portion (231) and the second stop portion (232), and being located below the first limiting protrusion (21) and the second limiting protrusion (22).

8. The binding system for a metallurgical furnace according to claim 7, wherein: A guide groove (236) is formed between the hanging portion (233) and the guide portion (235) to guide the first limiting protrusion (21) and the second limiting protrusion (22) to move in the circumferential direction.

9. The binding system for a metallurgical furnace according to claim 7, wherein: The hanging portion (233), the first stop portion (231), the second stop portion (232), the cover plate (234) and the guide portion (235) are formed as an integral component.

10. The binding system for a metallurgical furnace according to claim 5, wherein: An anti-falling structure is provided between the hanging portion (233) and the first limiting protrusion (21) and the second limiting protrusion (22).

11. The binding system for a metallurgical furnace according to any one of claims 1 to 10, wherein: The horizontal cross-sectional shape of the vertical seam (12) between the adjacent shell units (11) is a straight line or a broken line.

12. The binding system for a metallurgical furnace according to any one of claims 1 to 10, wherein: The elastic device further comprises: A first fixing block (41), the first fixing block (41) being fixedly arranged on an outer peripheral surface of a shell unit (11); a second fixing block (42), the second fixing block (42) being fixedly arranged on the outer peripheral surface of another adjacent shell unit (11), the first fixing block (41) and the second fixing block (42) being adjacent to each other and respectively located on both sides of the vertical seam (12) between the shell units (11); and A spring member is a tension spring and is connected between the first fixing block (41) and the second fixing block (42).

13. The binding system for a metallurgical furnace according to any one of claims 1 to 10, wherein: Connecting seats (51) are respectively provided at both ends of the tension transmission element (50); the elastic device further comprises a spring member, which is a tension spring and is connected between two adjacent connecting seats (51).

14. The binding system for a metallurgical furnace according to claim 13, wherein: The tension transmission element (50) is an arc-shaped connecting piece.

15. The binding system for a metallurgical furnace according to claim 13, wherein: The tension transmission element (50) is a steel cable.

16. The binding system for a metallurgical furnace according to claim 1, wherein: The horizontal cross-sectional shape of the vertical seam (12) between the adjacent shell units (11) is a bent linear shape.

17. Metallurgical furnaces, where The metallurgical furnace comprises the binding system according to any one of claims 1-16.

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