Horizontal-vertical mixed annealing furnace

Abstract

The utility model relates to a horizontal-vertical mixed annealing furnace, which comprises a horizontal furnace section, a vertical furnace section and a transition connecting section, the horizontal furnace section is connected with the vertical furnace section through the transition connecting section, the side of the horizontal furnace section away from the vertical furnace section is the entrance side of products, and the side of the vertical furnace section away from the horizontal furnace section is the exit side of products. The utility model has the advantages that compared with the traditional horizontal annealing furnace, the length is greatly shortened, the plant investment is saved, the strip steel distance in the furnace is long, more products can be produced, and the applicability of the utility model is improved; compared with the traditional vertical annealing furnace, the single heating power is high, and the heating time is short.

Description

Technical Field

[0001] This utility model relates to the field of strip steel heat treatment technology, specifically a horizontal and vertical hybrid annealing furnace. Background Technology

[0002] Annealing furnaces, as a type of heat treatment equipment, play an important role in industrial production. Their core function is to change the internal structure of metal materials by precisely controlling temperature and time, thereby eliminating internal defects and improving material performance.

[0003] Currently, commonly used annealing furnaces include horizontal and vertical annealing furnaces. Horizontal annealing furnaces have advantages such as large heating capacity and short heating distance, but to ensure the production efficiency of the unit, they must be of a certain length, resulting in drawbacks such as a larger plant footprint and insufficient soaking time. Vertical annealing furnaces have advantages such as a longer strip length within the furnace, the ability to meet the production needs of all processes, large cooling capacity, and fewer capacity limitations, but they require a certain height in the production workshop (e.g., the rail elevation in a hot-dip galvanizing plant needs to be 42m), and they also have drawbacks such as lower individual heating power and longer heating time.

[0004] Therefore, there is an urgent need to design a new type of annealing furnace to solve at least one of the above-mentioned defects. Utility Model Content

[0005] This utility model addresses the technical problems existing in the prior art by providing a horizontal and vertical hybrid annealing furnace, which has the advantages of short horizontal length and long strip distance inside the furnace.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: a horizontal and vertical hybrid annealing furnace, including a horizontal furnace section, a vertical furnace section, and a transition connecting section;

[0007] The horizontal furnace section and the vertical furnace section are connected by the transition connection section;

[0008] The side of the horizontal furnace section opposite to the vertical furnace section is the product inlet side; the side of the vertical furnace section opposite to the horizontal furnace section is the product outlet side.

[0009] As a further technical solution, the horizontal furnace section includes a preheating zone and a direct-fired heating zone;

[0010] The preheating zone is located near the inlet side of the product in the horizontal furnace section, and the heating zone is located near the outlet side of the product in the horizontal furnace section.

[0011] As a further technical solution, the vertical furnace section includes a radiant heating homogenization zone, a cooling zone, and a homogenization zone;

[0012] The radiant heating homogenization zone is located near the product inlet side of the vertical furnace section;

[0013] The cooling zone is located between the radiant heating homogenization zone and the equalization zone;

[0014] The equalization zone is located near the product outlet side of the vertical furnace section.

[0015] As a further technical solution, the outlet side of the horizontal furnace section is sealed to the transition connection section via a sealing joint.

[0016] As a further technical solution, the inlet side of the vertical furnace section is sealed to the transition connection section via a sealing joint.

[0017] As a further technical solution, the transition connection section includes a support assembly, a sealing chamber, and a transmission assembly;

[0018] The sealing chamber is installed in the middle of the support assembly, and the transmission assembly is installed on one side of the support assembly to drive the roller assembly inside the sealing chamber;

[0019] The inlet side of the sealed chamber is connected to the outlet side of the horizontal furnace section, and the outlet side of the sealed chamber is connected to the inlet side of the vertical furnace section.

[0020] As a further technical solution, the sealed chamber is provided with an upper support roller and a lower support roller;

[0021] The upper support roller and the lower support roller are arranged in parallel, and both ends of the central shaft of the upper support roller and the lower support roller extend out of the sealing chamber;

[0022] The shafts of the upper support roller and the lower support roller are respectively connected by a transmission assembly.

[0023] As a further technical solution, the transition connection section also includes a lifting drive component;

[0024] Both sides of the central axis of the upper support roller are connected to a lifting drive component via bearings, and the upper support roller is lifted or pressed down by the lifting drive component.

[0025] The lifting drive component is installed on the upper part of the support assembly.

[0026] As a further technical solution, the two sides of the upper support roller axis are respectively connected to a first air passage and a second air passage;

[0027] The lower support roller axis is connected to a third air vent and a fourth air vent on both sides.

[0028] As a further technical solution, a cooling pipe is provided in the sealed chamber.

[0029] The beneficial effects of this utility model are: at least the following effects

[0030] 1. Compared with traditional horizontal annealing furnaces, the length is significantly shortened, saving on factory investment. The strip distance inside the furnace is longer, which facilitates the production of more products and improves the applicability of this utility model annealing furnace.

[0031] 2. Compared with traditional vertical annealing furnaces, direct-burner nozzles have higher individual heating power and shorter heating time;

[0032] 3. The specific structural design of the transition connection section allows the product processed in the horizontal furnace section to enter the vertical furnace section. While ensuring good sealing, the setting of ventilation and cooling pipelines reduces the temperature of the sealing chamber, which is beneficial for cooling the steel rollers and other structures, thus improving their service life. Protective gas is introduced into the sealing chamber through the ventilation pipeline to form a slight positive pressure, thereby isolating the atmosphere on both sides of the sealing chamber.

[0033] 4. The design of this utility model reduces costs and improves productivity. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of a horizontal and vertical hybrid annealing furnace according to the present invention;

[0035] Figure 2 This is a schematic diagram of the structure when the upper support roller is pressed down in the transition section, where the first compensator on one side of the upper support roller is removed;

[0036] Figure 3 This is a schematic diagram of the structure when the upper support roller in the transition section is lifted.

[0037] Figure 4 for Figure 2 Schematic diagram of the structure in the AA direction;

[0038] Figure 5 for Figure 2 Schematic diagram of the structure in the middle BB direction;

[0039] Figure 6 for Figure 3 Schematic diagram of the structure in the CC direction;

[0040] Figure 7 for Figure 2 Schematic diagram of the structure in the D direction;

[0041] Figure 8 for Figure 2 A top-down view of the structure;

[0042] Figure 9 This is a schematic diagram of the sealed interior structure.

[0043] The attached diagram lists the components represented by each number as follows:

[0044] Horizontal furnace section 1, preheating zone 11, direct-fired heating zone 12;

[0045] Vertical furnace section 2, radiant heating soaking zone 21, cooling zone 22, equalization zone 23;

[0046] Transition connection section 3;

[0047] Support component 31, first support frame 311, second support frame 312, third support frame 313, connecting plate 314;

[0048] Sealed chamber 32, first vent pipe 321, second vent pipe 322, third vent pipe 323, fourth vent pipe 324;

[0049] Transmission assembly 33, gear motor 331, universal coupling 332;

[0050] Roller assembly 34, upper support roller 341, lower support roller 342, end cap 343;

[0051] 35. Lifting drive component, 36. Bearing housing, 37. First compensator, 38. Second compensator, 39. Cooling pipe. Detailed Implementation

[0052] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0053] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0054] In the description of this application, the term "for example" is used to mean "used as an example, illustration, or description." Any embodiment described as "for example" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to implement and use the present invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the present invention can be implemented without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of the present invention with unnecessary detail. Therefore, the present invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0055] Example 1

[0056] See Figure 1 A horizontal-vertical hybrid annealing furnace includes a horizontal furnace section 1, a vertical furnace section 2, and a transition connecting section 3; the horizontal furnace section 1 and the vertical furnace section 2 are connected through the transition connecting section 3; the side of the horizontal furnace section 1 facing away from the vertical furnace section 2 is the product inlet side; the side of the vertical furnace section 2 facing away from the horizontal furnace section 1 is the product outlet side.

[0057] This embodiment combines horizontal and vertical furnaces, thereby increasing production capacity and reducing factory investment.

[0058] See Figure 1 For example, the horizontal furnace section 1 includes a preheating zone 11 and a direct-fired heating zone 12; the preheating zone 11 is located near the inlet side of the product in the horizontal furnace section 1, and the direct-fired heating zone 12 is located near the outlet side of the product in the horizontal furnace section 1. Correspondingly, the vertical furnace section 2 includes a radiant heating homogenizing zone 21, a cooling zone 22, and a homogenizing zone 23; the radiant heating homogenizing zone 21 is located near the inlet side of the product in the vertical furnace section 2; the cooling zone 22 is located between the radiant heating homogenizing zone 21 and the homogenizing zone 23; and the homogenizing zone 23 is located near the outlet side of the product in the vertical furnace section 2.

[0059] It should be noted that the preheating zone 11 gradually heats the product (e.g., strip steel) from room temperature to avoid thermal stress deformation caused by rapid heating. During this process, oil stains on the product surface are removed and residual moisture is evaporated. The preheating zone 11 includes an insulation layer (e.g., ceramic fiber blanket, rock wool board), heating elements (e.g., iron-chromium-aluminum heating wire, high-speed burner), roller system, temperature control system (e.g., thermocouple, temperature controller), etc. It should be noted that the structural composition and function of this area are the same as those in a conventional horizontal annealing furnace, so they will not be described in detail.

[0060] It should be noted that the direct-fired heating zone 12 heats the strip steel to the required process temperature to meet the phase transformation requirements and homogenize the performance. The direct-fired heating zone 12 includes a heating system (e.g., silicon carbide rods, oxygen-enriched combustion burners), an air intake device (e.g., porous ceramic tubes arranged on the furnace top), a high-precision roller conveyor system, a strip steel tension control system, etc. It should be noted that the structural composition and function of this area are the same as those in a conventional horizontal annealing furnace, so they will not be described in detail.

[0061] It should be noted that the radiant heating homogenization zone 21 is a functional section that both radiates and heats the workpiece and achieves temperature homogenization. Within this zone: initially, the workpiece (e.g., strip steel) is heated from a low temperature to the target temperature via radiant heat transfer (e.g., heating tubes, infrared radiation elements); later, the furnace temperature is maintained uniformly and stably by precisely controlling the radiation intensity, completing the homogenization process (ensuring sufficient transformation of the workpiece's internal structure). The radiant heating homogenization zone 21 is used to maintain the strip steel temperature at the required process temperature to ensure sufficient recrystallization, eliminate transverse temperature differences in the strip steel, and avoid local overheating or underheating. For example, the radiant heating homogenization zone 21 includes a heating and temperature control system (e.g., silicon molybdenum rods, type B thermocouples, infrared thermal imagers), an airflow circulation device (e.g., top axial flow fan, annular porous ceramic distributor), and a roller system (e.g., support rollers, servo motors + planetary gearboxes). It should be noted that the structural composition and function of this zone are the same as in a conventional vertical annealing furnace, and therefore will not be described in detail.

[0062] It should be noted that the cooling zone 22 includes two stages: slow cooling and rapid cooling. The former uses nitrogen injection to reduce the strip temperature and control the surface oxidation of the strip; the latter introduces low-temperature nitrogen and increases the flow rate to rapidly cool the strip. For example, the cooling zone 22 includes a multi-stage cooling system, sealing and monitoring devices (such as labyrinth seal + air curtain, infrared thermometer), tension control system (tensioning roller, anti-wrinkle device), etc. It should be noted that the structural composition and function of this area are the same as those in a conventional vertical annealing furnace, so they will not be described in detail.

[0063] It should be noted that the equalization zone 23 controls the strip temperature within the target value to facilitate subsequent winding. This stage can eliminate the temperature gradient that may be generated in the cooling zone 22, prevent internal stress during winding, and improve performance uniformity. For example, the equalization zone 23 includes a temperature fine-tuning system (e.g., airflow circulation fan, auxiliary heating element) and a final inspection and unloading system (e.g., laser thickness gauge, surface inspection instrument).

[0064] For example, the top of the radiant heating uniform heating zone 21 is provided with a guide roller to transfer the strip steel to the cooling zone 22.

[0065] In the specific implementation process, to improve sealing performance, the outlet side of the horizontal furnace section 1 is sealed to the transition connection section 3 via a sealing joint; the inlet side of the vertical furnace section 2 is sealed to the transition connection section 3 via a sealing joint. That is, the process of transporting products (such as strip steel) from the horizontal furnace section 1 to the vertical furnace section 2 is carried out in a sealed environment, improving the product qualification rate.

[0066] In the specific implementation process, the transition connection section 3 includes a support assembly 31, a sealing chamber 32, and a transmission assembly 33; the sealing chamber 32 is installed in the middle of the support assembly 31, and the transmission assembly 33 is installed on one side of the support assembly 31 to drive the roller assembly 34 inside the sealing chamber 32; the inlet side of the sealing chamber 32 is connected to the outlet side of the horizontal furnace section 1, and the outlet side of the sealing chamber 32 is connected to the inlet side of the vertical furnace section 2.

[0067] See Figure 2 , Figure 3 For example, the support assembly 31 includes a first support frame 311, a second support frame 312, and a third support frame 313 arranged in sequence; and the bottom of the first support frame 311 near the second support frame 312 is connected to the second support frame 312 and the third support frame 313 through a connecting plate 314; it should be noted that the sealing chamber 32 is installed on the upper part of the second support frame 312, and the transmission assembly 33 is installed on the upper part of the first support frame 311.

[0068] It should be noted that the transmission component 33 is used to provide power and drive the roller assembly 34 inside the sealed chamber 32 to rotate.

[0069] See Figures 2-4 In the specific implementation process, the roller assembly 34 includes an upper support roller 341 and a lower support roller 342; the upper support roller 341 and the lower support roller 342 are arranged in parallel, and both ends of the shaft cores of the upper support roller 341 and the lower support roller 342 extend out of the sealing chamber 32; the shaft cores of the upper support roller 341 and the lower support roller 342 are respectively connected by a transmission assembly 33.

[0070] It should be noted that when the upper support roller 341 and the lower support roller 342 are working, the roller gap between them is preferably 4mm.

[0071] See Figures 2-5 In the specific implementation process, the transition connection section 3 further includes a lifting drive component 35; both sides of the central axis of the upper support roller 341 are connected to the lifting drive component 35 through bearings, and the upper support roller 341 is lifted or pressed down by the lifting drive component 35; the lifting drive component 35 is installed on the upper part of the support assembly 31.

[0072] See Figures 2-3 It should be noted that the bearing is mounted on the support assembly 31 via the bearing seat 36. For example, the bearing located on the shaft core at one end of the first support frame 311 is mounted on the first support frame 311 via the bearing seat 36, and the bearing located on the shaft core at one end of the third support frame 313 is mounted on the third support frame 313 via the bearing seat 36.

[0073] See Figures 2-6 For example, if the lifting drive component 35 is a cylinder, the cylinder is fixed on the support frame on the corresponding side, and the movable end of the cylinder is connected to the bearing seat 36 of the bearing on the corresponding side. When the annealing furnace is not working, the upper support roller 341 is lifted upward by the cylinder (at this time, the piston of the cylinder returns to its original position) to install the strip threading bar (at this time, the maximum roll gap between the upper support roller 341 and the lower support roller 342 is 120mm). When the annealing furnace is working, the movable end of the cylinder extends to press the upper support roller 341 downward, so that the upper support roller 341 and the lower support roller 342 are parallel, and the strip passes through the roll gap between the upper support roller 341 and the lower support roller 342.

[0074] See Figures 2-3 Furthermore, to adapt to temperature changes and improve service life, a first compensator 37 is installed on both sides of the axis of the upper support roller 341, and correspondingly, a second compensator 38 is installed on both sides of the axis of the lower support roller 342; for example, the first compensator 37 is a spherical compensator and the second compensator 38 is a metal corrugated compensator.

[0075] It should be noted that the first compensator 37 is located at one end near the middle roller body of the upper support roller 341, and the second compensator 38 is located at one end near the middle roller body of the lower support roller 342.

[0076] See Figures 2-3 For example, the transmission assembly 33 includes a gear motor 331 and a universal coupling 332. The driving fork of the universal coupling 332 is engaged by a key and secured with a lock nut. The driven fork of the universal coupling 332 is connected to the shaft of the upper support roller 341 by a key and secured with a locating pin to ensure axial positioning. The upper support roller 341 is driven to operate by starting the gear motor 331.

[0077] Similarly, the other transmission component 33 is connected to the lower support roller 342 in the same way.

[0078] It should be noted that end caps 343 are installed on the ends of the spindles of the upper support roller 341 and the lower support roller 342 that are away from the transmission assembly 33.

[0079] See Figures 2-3 , Figure 6 , Figure 8 , Figure 9 In the specific implementation process, the upper support roller 341 has a first ventilation pipe 321 and a second ventilation pipe 322 connected to both sides of its axis; the lower support roller 342 has a third ventilation pipe 323 and a fourth ventilation pipe 324 connected to both sides of its axis, so as to introduce protective gas into the sealing chamber 32. This creates a slight positive pressure within the sealing chamber 32, ultimately isolating the atmosphere on both sides of the sealing chamber 32 (i.e., one side is the horizontal furnace section 1, and the other side is the vertical furnace section 2). Furthermore, this protective gas can also reduce the temperature of the upper support roller 341 and the lower support roller 342, thereby increasing their service life. For example, the gas introduced into the first ventilation pipe 321 and the second ventilation pipe 323 is nitrogen. This structural design improves the sealing performance of the sealing chamber 32.

[0080] It should be noted that the first ventilation pipe 321 and the second ventilation pipe 322 can be configured as straight sections or curved sections as appropriate. For example, the first ventilation pipe 321 and the second ventilation pipe 322 connecting the upper support roller 341 are both curved pipe sections, while the third ventilation pipe 323 and the fourth ventilation pipe 324 connecting the lower support roller 342 are both straight pipe sections.

[0081] To reduce the temperature inside the sealing chamber 32, a cooling pipe 39 is provided inside the sealing chamber 32. For example, the cooling pipe 39 is installed along the inner wall of the sealing chamber 32. More specifically, the cooling pipe 39 extends from the upper inner wall of the sealing chamber 32 to the lower part, so that the cold water in the cooling pipe 39 first cools the temperature of the upper part of the sealing chamber 32 near the upper support roller 341. It should be noted that the cooling pipe 39 is filled with cooling water, which is discharged after heat exchange inside the sealing chamber 32, then circulated back into the sealing chamber 32 for heat exchange after heat exchange outside the sealing chamber 32, thereby reducing the temperature inside the sealing chamber 32.

[0082] This utility model is implemented as follows:

[0083] 1. The upper support roller 341 is lifted by the lifting drive component 35, and a threading rod is added;

[0084] 2. Turn on the transmission assembly 33 and place the product (e.g., strip steel) in the horizontal furnace section 1, passing it sequentially through the preheating zone 11, the direct-fired heating zone 12, the sealed chamber 32, the radiant heating homogenization zone 21, the cooling zone 22, and the equalization zone 23, before proceeding with the subsequent steel coiling operation.

[0085] This invention overcomes the shortcomings of traditional vertical and horizontal annealing furnaces, reducing factory investment and improving work efficiency.

[0086] It should be noted that the descriptions of each embodiment in the above embodiments have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0087] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0088] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A horizontal-vertical hybrid annealing furnace characterized by comprising: It includes a horizontal furnace section (1), a vertical furnace section (2), and a transition connection section (3); The horizontal furnace section (1) and the vertical furnace section (2) are connected by the transition connection section (3); The side of the horizontal furnace section (1) away from the vertical furnace section (2) is the product inlet side; the side of the vertical furnace section (2) away from the horizontal furnace section (1) is the product outlet side.

2. The horizontal-vertical hybrid annealing furnace according to claim 1, wherein The horizontal furnace section (1) includes a preheating zone (11) and a direct-fired heating zone (12); The preheating zone (11) is located near the inlet side of the product in the horizontal furnace section (1), and the direct-fired heating zone (12) is located near the outlet side of the product in the horizontal furnace section (1).

3. The horizontal-vertical hybrid annealing furnace according to claim 1, characterized in that, The vertical furnace section (2) includes a radiant heating homogenization zone (21), a cooling zone (22), and a homogenization zone (23); The radiant heating homogenization zone (21) is located near the product inlet side of the vertical furnace section (2); The cooling zone (22) is located between the radiant heating homogenization zone (21) and the equalization zone (23); The equalization zone (23) is located near the product outlet side of the vertical furnace section (2).

4. A horizontal-vertical hybrid annealing furnace according to claim 2, characterized in that, The outlet side of the horizontal furnace section (1) is sealed to the transition connection section (3) through a sealing joint.

5. A horizontal-vertical hybrid annealing furnace according to claim 3, characterized in that, The inlet side of the vertical furnace section (2) is sealed to the transition connection section (3) through a sealing joint.

6. A horizontal-vertical hybrid annealing furnace according to claim 1, characterized in that, The transition connection section (3) includes a support assembly (31), a sealing chamber (32), and a transmission assembly (33); The sealing chamber (32) is installed in the middle of the support assembly (31), and the transmission assembly (33) is installed on one side of the support assembly (31) to drive the roller assembly (34) inside the sealing chamber (32). The inlet side of the sealed chamber (32) is connected to the outlet side of the horizontal furnace section (1), and the outlet side of the sealed chamber (32) is connected to the inlet side of the vertical furnace section (2).

7. A horizontal-vertical hybrid annealing furnace according to claim 6, characterized in that, The roller assembly (34) is provided with an upper support roller (341) and a lower support roller (342). The upper support roller (341) and the lower support roller (342) are arranged in parallel, and both ends of the shaft core of the upper support roller (341) and the lower support roller (342) extend out of the sealing chamber (32). The shafts of the upper support roller (341) and the lower support roller (342) are respectively connected by a transmission assembly (33).

8. A horizontal-vertical hybrid annealing furnace according to claim 7, characterized in that, The transition connection section (3) also includes a lifting drive component (35); Both sides of the central axis of the upper support roller (341) are connected to a lifting drive (35) through bearings, and the upper support roller (341) is lifted or pressed down by the lifting drive (35). The lifting drive (35) is installed on the upper part of the support assembly (31).

9. A horizontal-vertical hybrid annealing furnace according to claim 7, characterized in that, The upper support roller (341) has a first ventilation pipe (321) and a second ventilation pipe (322) connected to both sides of its axis. The lower support roller (342) has a third ventilation pipe (323) and a fourth ventilation pipe (324) connected to both sides of its axis.

10. A horizontal-vertical hybrid annealing furnace according to claim 6, characterized in that, The sealed chamber (32) is equipped with a cooling pipe (39).

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