Anti-scratch device of horizontal bright annealing furnace for steel strip
By setting 90-degree bends and guide rollers in the conveying pipeline of the horizontal bright annealing furnace, the air is isolated by using the difference in gas density, and automatically removing dust with the ash-accumulating plate, the steel belt abrasion and safety in the traditional horizontal bright annealing furnace are solved. The problem of hidden dangers has achieved a safer and lower compression heat treatment process.
Patent Information
- Application Number
- CN202323485446.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-20
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2033-12-20
AI Technical Summary
In traditional horizontal bright annealing furnace, excessive compression force of the wool felt pressing mechanism causes abrasion on the steel belt surface, and mixing ammonia decomposition gas or hydrogen with air can easily cause combustion on the furnace mouth, which poses safety hazards.
By setting 90-degree bending and guide rollers at the inlet and outlet of the conveying pipe, the air is isolated by using the difference in gas density, the compression force of the wool felt pressing mechanism is reduced, and a gray-absorbing plate is installed between the guide rollers to automatically remove dust and crushing shaved.
It effectively avoids scratches and oxidation on the surface of the steel belt, reduces safety risks, reduces the compression force of the wool felt pressing mechanism, and prevents combustion caused by mixing air with ammonia decomposition gas or hydrogen.
Smart Images
Figure CN222250891U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of steel strip manufacturing, in particular to an anti-scratch device for a horizontal bright annealing furnace for steel strips. Background Art
[0002] It is well known in the field of steel strip manufacturing that after rolling and cleaning, the steel strip needs to be heat treated in a bright annealing furnace to make the surface of the steel strip bright and not bluish. Based on the size characteristics of the steel strip (larger length and width) and cost considerations, the most commonly used horizontal bright annealing furnace is used for heat treatment.
[0003] Traditional horizontal bright annealing furnaces all include a preheating section, a furnace and a cooling section connected in sequence. The front end of the preheating section has a horizontally arranged conveying pipeline, the entrance of which has a first wool felt pressing mechanism, and a feeding roller is arranged horizontally in front of the first wool felt pressing mechanism; the rear end of the cooling section has a horizontally arranged conveying pipeline, the exit of which has a second wool felt pressing mechanism, and a receiving roller is arranged horizontally behind the second wool felt pressing mechanism. When in use, the steel strip is fed into the horizontal bright annealing furnace from the first wool felt pressing mechanism at the entrance by the feeding roller, and the heat-treated steel strip is then fed out from the second wool felt pressing mechanism at the exit to the receiving roller for receiving. In order to ensure that the steel strip has no structural changes and the surface glossiness, the entire heat treatment process is carried out under the protection of ammonia decomposition gas or hydrogen, that is, the entire furnace cavity of the horizontal bright annealing furnace from the first wool felt pressing mechanism to the second wool felt pressing mechanism is filled with ammonia decomposition gas or hydrogen, and the pressing force of the first wool felt pressing mechanism and the second wool felt pressing mechanism on the steel strip must be large enough to ensure the sealing of the furnace cavity to prevent air from entering the furnace and causing oxidation, bluing or other safety accidents of the steel strip.
[0004] However, the excessive pressing force of the first wool felt pressing mechanism and the second wool felt pressing mechanism often causes serious scratches on the surface of the steel strip. At the same time, the dust and debris generated in the furnace are easily intercepted by the second wool felt pressing mechanism at the exit when moving with the steel strip, which will further aggravate the scratches on the surface of the steel strip. Moreover, when the wool felt pressing mechanism is opened for cleaning, air and ammonia decomposition gas or hydrogen will flow horizontally and mix. Under high temperature or static electricity, furnace mouth combustion is very likely to occur, which will not only damage the wool felt, but also pose a major safety hazard. Utility Model Content
[0005] The utility model aims to solve the deficiencies of the prior art and provides an anti-scratch device for a horizontal bright annealing furnace for steel strips. The anti-scratch device can not only avoid scratches on the surface of the steel strip while reducing the pressing force of the wool felt pressing mechanism, but also effectively isolate the air to avoid oxidation and bluing of the steel strip. At the same time, when the wool felt pressing mechanism is opened for cleaning, furnace mouth burning is not likely to occur, thereby eliminating safety hazards.
[0006] To solve the above problems, the following technical solutions are adopted:
[0007] The utility model discloses an anti-scratch device for a horizontal bright annealing furnace for steel strips, comprising a preheating section, a furnace and a cooling section connected in sequence. A first wool felt pressing mechanism is provided at the inlet of the conveying pipe at the front end of the preheating section, and a second wool felt pressing mechanism is provided at the outlet of the conveying pipe at the rear end of the cooling section. The utility model is characterized in that the conveying pipe at the front end of the preheating section is bent 90 degrees downward, and a second guide roller is provided inside the bend. The first wool felt pressing mechanism is located at the lower end of the conveying pipe at the front end of the preheating section, and a first guide roller is provided below the first wool felt pressing mechanism. The conveying pipe at the rear end of the cooling section is bent 90 degrees downward, and a third guide roller is provided inside the bend. The second wool felt pressing mechanism is located at the lower end of the conveying pipe at the rear end of the cooling section, and a fifth guide roller is provided below the second wool felt pressing mechanism.
[0008] Furthermore, there is a fourth guide roller in the conveying pipe between the third guide roller and the second wool felt pressing mechanism. The fourth guide roller is located below and inside the third guide roller, so that after the steel belt is guided by the third guide roller and the fourth guide roller, the angle of the steel belt before and after the third guide roller is less than 90 degrees.
[0009] There is a horizontally arranged dust accumulation plate in the conveying pipe below the fourth guide roller, the two side edges of the dust accumulation plate are respectively connected to the inner walls on both sides of the conveying pipe, the outer edge of the dust accumulation plate is connected to the inner wall of the outer side of the conveying pipe, and the projection of the inner edge of the dust accumulation plate on the horizontal plane does not exceed the inner edge of the fourth guide roller.
[0010] Cleaning ports are arranged on both side walls of the corresponding conveying pipeline above the dust accumulation plate.
[0011] Wherein, a feeding roller is arranged in the horizontal front of the preheating section, and a receiving roller is arranged in the horizontal rear of the cooling section.
[0012] The above solution has the following advantages:
[0013] The conveying pipe at the front end of the preheating section of the anti-scratch device of the steel strip horizontal bright annealing furnace of the utility model is bent 90 degrees downward, and a second guide roller is arranged inside the bend; the first wool felt pressing mechanism is located at the lower end of the conveying pipe at the front end of the preheating section, and a first guide roller is arranged below it; the conveying pipe at the rear end of the cooling section is bent 90 degrees downward, and a third guide roller is arranged inside the bend; the second wool felt pressing mechanism is located at the lower end of the conveying pipe at the rear end of the cooling section, and a fifth guide roller is arranged below it. When in use, the steel strip is guided from the first guide roller, enters the conveying pipe from below through the first wool felt pressing mechanism, and then is guided by the second guide roller, and then horizontally passes through the preheating section, the furnace and the cooling section of the horizontal bright annealing furnace in sequence for heat treatment; the heat-treated steel strip is guided by the third guide roller, turns downward, passes through the second wool felt pressing mechanism, and is led out by the fifth guide roller for collection. Since the density of ammonia decomposition gas or hydrogen is much smaller than that of air, after the delivery pipes at the inlet and outlet are set to bend downward at 90 degrees, a boundary will automatically form between the ammonia decomposition gas or hydrogen and the air, which can effectively isolate the air from entering the inner cavity of the furnace body and no longer rely on the pressing force of the wool felt pressing mechanism. It can be seen that the device can not only avoid scratches on the surface of the steel belt while reducing the pressing force of the wool felt pressing mechanism, but also effectively isolate the air and prevent the steel belt from oxidation and bluing. At the same time, when the wool felt pressing mechanism is opened for cleaning, due to the influence of density, the air and ammonia decomposition gas or hydrogen will not flow vertically and mix, and it is not easy for the furnace mouth to burn, which can eliminate safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 The utility model is a structural schematic diagram of a scratch prevention device for a horizontal bright annealing furnace for steel strips. DETAILED DESCRIPTION
[0015] The utility model is further described in detail below in conjunction with the accompanying drawings.
[0016] like Figure 1As shown, the anti-scratch device of the horizontal bright annealing furnace for steel strip of the utility model comprises a preheating section 4, a furnace 5 and a cooling section 6 connected in sequence, and a first wool felt pressing mechanism 2 is provided at the inlet of the conveying pipeline at the front end of the preheating section 4, and a second wool felt pressing mechanism 12 is provided at the outlet of the conveying pipeline at the rear end of the cooling section 6. The conveying pipeline at the front end of the preheating section 4 is bent 90 degrees downward, and a second guide roller 3 is provided inside the bend. The first wool felt pressing mechanism 2 is located at the lower end of the conveying pipeline at the front end of the preheating section 4, and a first guide roller 14 is provided below the first wool felt pressing mechanism 2. The conveying pipeline at the rear end of the cooling section 6 is bent 90 degrees downward, and a third guide roller 7 is provided inside the bend. The second wool felt pressing mechanism 12 is located at the lower end of the conveying pipeline at the rear end of the cooling section 6, and a fifth guide roller 11 is provided below the second wool felt pressing mechanism 12. A feeding roller 1 is provided horizontally in front of the preheating section 4, and a receiving roller 10 is provided horizontally behind the cooling section 6.
[0017] In this embodiment, there is a fourth guide roller 8 in the section of the conveying pipeline between the third guide roller 7 and the second wool felt pressing mechanism 12. The fourth guide roller 8 is located below and inside the third guide roller 7, so that after the steel strip is guided by the third guide roller 7 and the fourth guide roller 8, the angle of the steel strip before and after the third guide roller 7 is less than 90 degrees. There is a horizontally arranged dust accumulation plate 13 in the conveying pipeline below the fourth guide roller 8. The two side edges of the dust accumulation plate 13 are respectively connected to the inner walls on both sides of the conveying pipeline, and the outer edge of the dust accumulation plate 13 is connected to the inner wall on the outer side of the conveying pipeline. The projection of the inner edge of the dust accumulation plate 13 on the horizontal plane does not exceed the inner edge of the fourth guide roller 8. There are cleaning ports 9 on both side walls of the conveying pipeline corresponding to the dust accumulation plate 13. The purpose of setting the fourth guide roller 8 is to make the steel belt angle before and after the third guide roller 7 less than 90 degrees, so that the dust and debris in the furnace body will automatically fall to the dust accumulation plate 13 when the steel belt moves to the inclined section between the third guide roller 7 and the fourth guide roller 8, and it is not easy to gather at the second wool felt pressing mechanism 12, so as to prevent the foreign matter on the surface of the steel belt at the outlet from scratching. After a period of time, the cleaning port 9 can be opened to remove the dust and debris on the dust accumulation plate 13, which is convenient and quick.
[0018] When in use, the steel strip sent by the feeding roller 1 is guided downward from the first guide roller 14, enters the conveying pipeline from below through the first wool felt pressing mechanism 2, and then is guided by the second guide roller 3, and then horizontally passes through the preheating section 4, the furnace 5 and the cooling section 6 of the horizontal bright annealing furnace in sequence for heat treatment; the heat-treated steel strip is guided by the third guide roller 7, tilted inward, and then guided by the fourth guide roller 8, and then turned downward and passed through the second wool felt pressing mechanism 12, and then led out by the fifth guide roller 11, and then passed upward through the receiving roller 10 for receiving. When the dust, debris, etc. in the furnace body move with the steel strip to the inclined section between the third guide roller 7 and the fourth guide roller 8, they will automatically fall to the dust accumulation plate 13, and can be promptly removed by the cleaning port 9.
[0019] Since the density of ammonia decomposition gas or hydrogen is much smaller than that of air, after the delivery pipes at the inlet and outlet are set to bend downward at 90 degrees, a boundary will automatically form between the ammonia decomposition gas or hydrogen and the air, which can effectively isolate the air from entering the inner cavity of the furnace body and no longer rely on the pressing force of the wool felt pressing mechanism. It can be seen that the device can not only avoid scratches on the surface of the steel belt while reducing the pressing force of the wool felt pressing mechanism, but also effectively isolate the air and prevent the steel belt from oxidation and bluing. At the same time, when the wool felt pressing mechanism is opened for cleaning, due to the influence of density, the air and ammonia decomposition gas or hydrogen will not flow vertically and mix, and it is not easy for the furnace mouth to burn, which can eliminate safety hazards.
Claims
1. A scratch prevention device for a horizontal bright annealing furnace for steel strips, comprising a preheating section (4), a furnace (5) and a cooling section (6) connected in sequence, wherein a first wool felt pressing mechanism (2) is provided at the inlet of a conveying pipeline at the front end of the preheating section (4), and a second wool felt pressing mechanism (12) is provided at the outlet of a conveying pipeline at the rear end of the cooling section (6); characterized in that The conveying pipe at the front end of the preheating section (4) is bent downward at 90 degrees, and a second guide roller (3) is provided inside the bent portion; the first wool felt pressing mechanism (2) is located at the lower end of the conveying pipe at the front end of the preheating section (4), and a first guide roller (14) is provided below the first wool felt pressing mechanism (2); the conveying pipe at the rear end of the cooling section (6) is bent downward at 90 degrees, and a third guide roller (7) is provided inside the bent portion; the second wool felt pressing mechanism (12) is located at the lower end of the conveying pipe at the rear end of the cooling section (6), and a fifth guide roller (11) is provided below the second wool felt pressing mechanism (12).
2. The anti-scratch device for a horizontal bright annealing furnace for steel strip according to claim 1, characterized in that A fourth guide roller (8) is also provided in the section of the conveying pipeline between the third guide roller (7) and the second wool felt pressing mechanism (12). The fourth guide roller (8) is located below and inside the third guide roller (7), so that after the steel strip is guided by the third guide roller (7) and the fourth guide roller (8), the angle between the steel strip before and after the third guide roller (7) is less than 90 degrees.
3. The anti-scratch device for a horizontal bright annealing furnace for steel strip according to claim 2, characterized in that A dust accumulation plate (13) is arranged horizontally in the conveying pipe below the fourth guide roller (8), the two side edges of the dust accumulation plate (13) are respectively connected to the inner walls on both sides of the conveying pipe, the outer edge of the dust accumulation plate (13) is connected to the inner wall of the outer side of the conveying pipe, and the projection of the inner edge of the dust accumulation plate (13) on the horizontal plane does not exceed the inner edge of the fourth guide roller (8).
4. The anti-scratch device for a horizontal bright annealing furnace for steel strip according to claim 3, characterized in that Cleaning ports (9) are provided on both side walls of the corresponding conveying pipeline above the dust accumulation plate (13).
5. The anti-scratch device for a horizontal bright annealing furnace for steel strip according to any one of claims 1 to 4, characterized in that A feeding roller (1) is provided horizontally in front of the preheating section (4), and a receiving roller (10) is provided horizontally behind the cooling section (6).