Device for preventing hot rolling cover annealing stainless steel band pickling air pipe from being scratched
By installing anti-scratch pipe assemblies in the air-cooled and mist-cooled sections, and using heat-resistant stainless steel pipes and sleeves to support the strip steel, the problem of scratches caused by contact between hot-rolled stainless steel strips and air ducts on the continuous annealing and pickling line is solved, thereby improving product quality and protecting equipment.
Patent Information
- Application Number
- CN202422793442.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-15
- Publication Date
- 2025-11-14
- Estimated Expiration
- 2034-11-15
AI Technical Summary
Hot-rolled stainless steel strips are prone to scratches when they come into contact with air ducts in the air-cooling and mist-cooling sections of continuous annealing and pickling lines, resulting in quality defects that cannot be eliminated. Existing technologies cannot effectively prevent such problems.
The anti-scratch pipe assembly, including heat-resistant stainless steel pipe and sleeve, is installed in the transmission box of the air-cooled and mist-cooled sections. The sleeve is equipped with an annular cooling chamber and small holes. It prevents contact with the air duct by supporting the strip steel and uses cooling water to reduce friction. The sleeve and strip steel are in rolling contact to prevent scratches.
It effectively prevents the steel strip from scratching the air duct, while protecting the air duct from damage, improving product quality and extending equipment life.
Smart Images
Figure CN223543728U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of strip steel production technology, specifically to a device for preventing scratches on the pickling duct of hot-rolled stainless steel strip. Background Technology
[0002] Hot-rolled stainless steel strips after bell-type annealing commonly exhibit shape defects such as central waviness, edge waviness, and warping. These strips require pickling to remove oxide scale in the next process. Pickling is typically carried out on a continuous annealing pickling line for hot-rolled stainless steel. If a pickling-only process (without annealing, i.e., without using a continuous annealing furnace for heating, with the furnace temperature below 500℃) is selected, and the strip still needs to pass through the air-cooling and mist-cooling sections of the annealing furnace process equipment area of the continuous annealing pickling line (the cooling section of the annealing furnace is further divided into an air-cooling zone + a mist-cooling zone + a water-cooling zone), the strips with poor shape are prone to occasional contact with the air-cooling duct cutters at the inlet, outlet, and middle of the air-cooling and mist-cooling sections, resulting in severe air knife scratches. These defects cannot be eliminated later and can only lead to downgrading or scrapping of the product in that section. Furthermore, the strips are prone to scratching and damaging the ductwork. Utility Model Content
[0003] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a device for preventing scratches on the pickling duct of hot-rolled stainless steel strip, so as to prevent scratches caused by the hot-rolled stainless steel strip rubbing against its duct in the air-cooling and mist-cooling sections of the continuous annealing pickling line.
[0004] The purpose of this utility model is achieved through the following technical solution: a device for preventing scratches on the pickling duct of hot-rolled stainless steel strip, comprising multiple anti-scratch tube assemblies, wherein the anti-scratch tube assemblies are used to be installed in the transmission box of the air-cooled and mist-cooled sections, the anti-scratch tube assembly comprising a heat-resistant stainless steel tube and a sleeve, one end of the heat-resistant stainless steel tube being installed in the transmission box and the other end being connected to the strip cooling water pipe, the sleeve being movably fitted onto the heat-resistant stainless steel tube, the sleeve having an annular cooling cavity, and the outer wall of the heat-resistant stainless steel tube having multiple small holes along its own axial direction, the small holes being located in the annular cooling cavity.
[0005] Furthermore, a sleeve is fixed inside the transmission housing, and the end of the heat-resistant stainless steel pipe away from the strip cooling water pipe is inserted into the sleeve.
[0006] Furthermore, a wedge-shaped opening is provided at one end of the sleeve near the heat-resistant stainless steel tube, the wedge-shaped opening being used to guide the heat-resistant stainless steel tube to fit into the sleeve.
[0007] Furthermore, a flange is fitted onto one end of the heat-resistant stainless steel pipe near the strip cooling water pipe, and the flange is connected to the mounting flange on the transmission housing.
[0008] Furthermore, one end of the heat-resistant stainless steel pipe connecting to the strip cooling water pipe is provided with an internal thread for threaded connection to the strip cooling water pipe.
[0009] Furthermore, one set of the anti-scratch pipe assembly is installed at the inlet and outlet of the air-cooled section, with the anti-scratch pipe assembly located above the strip steel. Two sets of the anti-scratch pipe assemblies are installed vertically in the middle of the air-cooled section, with the strip steel located between the two sets of the anti-scratch pipe assemblies.
[0010] Furthermore, one set of the anti-scratch tube assembly is installed at the inlet and outlet of the mist cooling section, with the anti-scratch tube assembly located above the strip steel. Two sets of the anti-scratch tube assemblies are installed vertically in the middle of the mist cooling section, with the strip steel located between the two sets of the anti-scratch tube assemblies.
[0011] The beneficial effects of this utility model are:
[0012] By supporting the strip steel with anti-scratch tubing, the strip steel is separated from the air duct, which prevents scratches on the strip steel and damage to the air duct. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the structure of a device for preventing scratches on the pickling duct of stainless steel strip under hot rolling cover according to the present invention;
[0014] Figure 2 for Figure 1 Enlarged view of point A in the middle;
[0015] Figure 3 This is a schematic diagram of the installation of a device for preventing scratches on the pickling duct of stainless steel strip under hot rolling cover according to this utility model.
[0016] In the diagram, 1-heat resistant stainless steel pipe, 2-sleeve, 3-strip steel cooling water pipe, 4-annular cooling cavity, 5-small hole, 6-sleeve, 7-wedge-shaped flat mouth, 8-flange. Detailed Implementation
[0017] Example 1
[0018] like Figures 1 to 3As shown, a device for preventing scratches on the pickling duct of hot-rolled stainless steel strip includes multiple anti-scratch tube assemblies. These anti-scratch tube assemblies are installed in the transmission box of the air-cooled and mist-cooled sections. Each anti-scratch tube assembly includes a heat-resistant stainless steel tube 1 and a sleeve 2. One end of the heat-resistant stainless steel tube 1 is installed in the transmission box, and the other end is connected to a strip cooling water pipe 3. The sleeve 2 is movably fitted onto the heat-resistant stainless steel tube 1. An annular cooling chamber 4 is provided inside the sleeve 2. Multiple small holes 5 are provided along the axial direction of the outer wall of the heat-resistant stainless steel tube 1, located within the annular cooling chamber 4. The sleeve 2 contacts the strip for support and limitation, preventing contact between the strip and the duct. The sleeve 2 is rotatably mounted on the heat-resistant stainless steel tube 1, ensuring rolling contact between the sleeve 2 and the strip, significantly reducing friction and preventing scratches. Cold water is added to the heat-resistant stainless steel tube 1 through the strip cooling water pipe 3, and the cold water flows through the small holes 5 into the annular cooling chamber 4, ensuring that the strip is not scalded during production at 500℃.
[0019] Example 2
[0020] Based on Example 1, such as Figure 3 As shown, one set of anti-scratch pipe assemblies is installed at the inlet and outlet of the air-cooling section, with the anti-scratch pipe assemblies located above the strip. Two sets of anti-scratch pipe assemblies are installed vertically in the middle of the air-cooling section, with the strip located between the two sets of anti-scratch pipe assemblies. Similarly, one set of anti-scratch pipe assemblies is installed at the inlet and outlet of the mist-cooling section, with the anti-scratch pipe assemblies located above the strip. Two sets of anti-scratch pipe assemblies are installed vertically in the middle of the mist-cooling section, with the strip located between the two sets of anti-scratch pipe assemblies. Before the production of hood-type annealed stainless steel strip, i.e. during the period when the hot-rolled stainless steel continuous annealing and pickling line is shut down to prepare for the production of hood-type annealed stainless steel strip, the process requires the furnace temperature and strip temperature to drop to ≤500℃, and the production line is in a state of shutdown preparation. Production operators can install the anti-scratch pipe assemblies at the above-mentioned locations to prevent the air ducts from being scratched when the hot-rolled hood-type annealed stainless steel strip passes through the cooling section of the continuous annealing and pickling line.
[0021] Example 3
[0022] Based on Example 2, such as Figure 1 As shown, a sleeve 6 is fixed inside the transmission box. The end of the heat-resistant stainless steel tube 1 away from the strip cooling water pipe 3 is inserted into the sleeve 6. A wedge-shaped flat opening 7 is provided at the end of the sleeve 6 near the heat-resistant stainless steel tube 1. The wedge-shaped flat opening 7 is used to guide the heat-resistant stainless steel tube 1 to fit into the sleeve 6. The sleeve 6 supports one end of the heat-resistant stainless steel tube 1. During the insertion of the heat-resistant stainless steel tube 1, the heat-resistant stainless steel tube 1 first contacts the wedge-shaped flat opening 7. The wedge-shaped flat opening 7 guides the heat-resistant stainless steel tube 1, so that the heat-resistant stainless steel tube 1 fits into the sleeve 6 for support.
[0023] Furthermore, a flange 8 is fitted at one end of the heat-resistant stainless steel pipe 1 near the strip cooling water pipe 3. The flange 8 is connected to the mounting flange on the transmission box. The other end of the heat-resistant stainless steel pipe 1 is connected to the mounting flange through the flange 8, thereby completing the installation of the heat-resistant stainless steel pipe 1. The operation is simple and quick. The end of the heat-resistant stainless steel pipe 1 that connects to the strip cooling water pipe 3 is provided with an internal thread for threaded connection of the strip cooling water pipe 3. The strip cooling water pipe 3 can be quickly connected to the heat-resistant stainless steel pipe 1 through the thread.
Claims
1. A device for preventing scratches on pickling ducts of hot-rolled stainless steel strip, characterized in that, The device includes multiple anti-scratch tube assemblies, which are used to install in the transmission box of the air-cooled and mist-cooled sections. The anti-scratch tube assembly includes a heat-resistant stainless steel tube (1) and a sleeve (2). One end of the heat-resistant stainless steel tube (1) is installed in the transmission box, and the other end is connected to a strip steel cooling water pipe (3). The sleeve (2) is movably fitted on the heat-resistant stainless steel tube (1). An annular cooling cavity (4) is provided inside the sleeve (2). Multiple small holes (5) are provided on the outer wall of the heat-resistant stainless steel tube (1) along its own axial direction. The small holes (5) are located in the annular cooling cavity (4).
2. The device for preventing scratches on pickling ducts of hot-rolled stainless steel strips according to claim 1, characterized in that, A sleeve (6) is fixed inside the transmission box, and the end of the heat-resistant stainless steel pipe (1) away from the strip cooling water pipe (3) is inserted into the sleeve (6).
3. The device for preventing scratches on pickling ducts of hot-rolled stainless steel strips according to claim 2, characterized in that, The sleeve (6) has a wedge-shaped flat opening (7) at one end near the heat-resistant stainless steel tube (1), and the wedge-shaped flat opening (7) is used to guide the heat-resistant stainless steel tube (1) to fit into the sleeve (6).
4. The device for preventing scratches on pickling ducts of hot-rolled stainless steel strips according to claim 1, characterized in that, The heat-resistant stainless steel pipe (1) is fitted with a flange (8) at one end near the strip cooling water pipe (3), and the flange (8) is connected to the mounting flange on the transmission box.
5. The device for preventing scratches on pickling ducts of hot-rolled stainless steel strips according to claim 1, characterized in that, The heat-resistant stainless steel pipe (1) is provided with an internal thread at one end of the strip cooling water pipe (3) for threaded connection to the strip cooling water pipe (3).
6. The device for preventing scratches on pickling ducts of hot-rolled stainless steel strips according to claim 1, characterized in that, One set of the anti-scratch tube assembly is installed at the inlet and outlet of the air-cooled section, with the anti-scratch tube assembly located above the strip steel. Two sets of the anti-scratch tube assemblies are installed vertically in the middle of the air-cooled section, with the strip steel located between the two sets of the anti-scratch tube assemblies.
7. The device for preventing scratches on pickling ducts of hot-rolled stainless steel strips according to claim 6, characterized in that, One set of the anti-scratch tube assembly is installed at the inlet and outlet of the mist cooling section, with the anti-scratch tube assembly located above the strip steel. Two sets of the anti-scratch tube assemblies are installed vertically in the middle of the mist cooling section, with the strip steel located between the two sets of the anti-scratch tube assemblies.