Rapid treatment method for broken strip in horizontal annealing furnace of hot-dip galvanized steel strip with thickness of greater than 2.5 mm

Abstract

The invention belongs to the technical field of cold-rolled galvanizing production, and relates to a method for rapidly treating broken strips in a horizontal annealing furnace for hot-galvanized steel strips with the thickness larger than 2.5 mm. When the strip is broken, the uncoiler (1) and the horizontal annealing furnace (7) both stop, the front section (22) of the broken strip is pulled out of an outlet of the horizontal annealing furnace (7), the uncoiler (1) is controlled to perform reverse coiling, the rear section (23) of the broken strip is retreated, and the steel strip (2) with the thickness larger than 2.5 mm is taken away; a steel belt (17) with the thickness smaller than or equal to 1.5 mm is placed on an uncoiler (1), a belt head (18) is formed at the end of the steel belt (17) with the thickness smaller than or equal to 1.5 mm, and a belt penetrating triangular ring (19) is welded to the belt head (18); a steel belt (2) with the thickness smaller than or equal to 1.5 mm enters from an inlet of the horizontal annealing furnace (7); the strip threading rod (15) is connected with the strip threading triangular ring (19) through a chain (20), and the strip threading rod (15) is pushed to the middle position of the carrier roller (16). According to the method, the treatment time of the broken strip in the thick horizontal annealing furnace is greatly shortened, the production efficiency is improved, the labor intensity is reduced, and the personnel safety in the accident treatment process is guaranteed.

Description

Technical Field

[0001] This invention belongs to the field of cold-rolled galvanizing production technology, and more specifically, it relates to a rapid treatment method for broken strips in a horizontal annealing furnace for hot-dip galvanized steel strips with a thickness >2.5mm. Background Technology

[0002] Current continuous hot-dip galvanizing production of strip steel involves coiling the strip at the inlet uncoiler, shearing the head and tail, welding, and chemically cleaning and degreasing. The strip then enters a continuous horizontal annealing furnace for recrystallization annealing, reducing the oxide layer on the surface to an active pure iron layer. Next, it undergoes hot-dip galvanizing in a zinc bath under sealed conditions. After galvanizing, the strip passes through a finishing machine and a stretch straightener to improve its shape, and then undergoes passivation or surface oiling treatment before finally entering a coiler to produce the finished product. However, for strips with a thickness greater than 2.5mm, poor weld quality or equipment malfunction can lead to strip breakage accidents within the horizontal annealing furnace. The traditional method for handling these accidents is to weld the section before and after the breakage. While this method is effective for strips ≤2.5mm thick and is the standard method for hot-dip galvanizing strip threading in horizontal annealing furnaces, it is ineffective in resolving the issue once a strip thickness greater than 2.5mm breaks within the furnace. Strip steel thicker than 2.5mm has a large self-weight, causing the threading rod to not move forward in a stable straight line. This results in the threading rod head deviating and hitting the furnace wall, making it impossible to complete the threading operation. Furthermore, the thickness of strip steel thicker than 2.5mm is significant; after welding, the overall thickness of the section before and after the break is too large to effectively pass through the gaps in subsequent processed components. Therefore, for strip breakage in a horizontal annealing furnace of 3.0mm thick strip steel, conventional threading methods in a horizontal annealing furnace cannot be effectively completed, hindering rapid production recovery and severely restricting production efficiency. Corresponding rapid handling methods are needed for strip breakage incidents in horizontal annealing furnaces handling the maximum thickness of hot-dip galvanized strip.

[0003] Existing technology includes a method for hot-dip galvanizing strip threading in a continuous horizontal annealing furnace, titled "An Improved Method for Hot-Dip Galvanizing Strip Threading," with publication number CN116162783A. This method discloses an improved hot-dip galvanizing strip threading method using a threading needle. The steel strip is threaded at the No. 4 hot tension roller group in the turning chamber of the horizontal annealing furnace using a steel ball and iron chain anti-entanglement method. A steel ball and iron chain are designed and manufactured, with one end connected to a steel ball. The tail of the threading needle is also connected to the chain, and the end of the chain is connected to the steel strip via a triangular ring. The threading needle... The steel belt is pulled into the horizontal annealing furnace. With the completion of the first stage of hot piercing, the needle and the head of the No. 1 iron chain are passed through the valve hole of the No. 3 gate of the horizontal annealing furnace. The 5-ton overhead crane above the zinc pot area is started to lift the needle away. Then, the front end of the No. 1 iron chain is fixed to the transmission side DS of the valve handle of the No. 3 gate. Then, the tail end link of the No. 2 iron chain is hooked out from the steering chamber and connected to the link of the front end of the No. 1 iron chain with a lock. The steel ball is guided into the lower wedge groove of the horizontal annealing furnace and submerged into the zinc pot. The steel ball is retrieved from the front end of the submerged roller, completing the hot piercing of the horizontal annealing furnace.

[0004] However, this technology does not address the technical issues and solutions of this application. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a simple and effective method for handling strip breakage in the horizontal annealing furnace of hot-dip galvanized steel strip with a thickness of >2.5mm, thereby improving production efficiency, quickly restoring production, and ensuring personnel safety during accident handling.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: This invention provides a method for rapid treatment of broken hot-dip galvanized steel strip with a thickness greater than 2.5mm in a horizontal annealing furnace. The hot-dip galvanized steel strip 2 with a thickness greater than 2.5mm is placed into an uncoiler 1, the uncoiler 1 discharges the material, and the material continuously enters the horizontal annealing furnace 7 and continuously exits it from the horizontal annealing furnace 7. S1. When the hot-dip galvanized steel strip 2 with a thickness greater than 2.5mm breaks inside the horizontal annealing furnace 7, both the uncoiler 1 and the horizontal annealing furnace 7 stop. The broken front section 22 of the hot-dip galvanized steel strip 2 with a thickness greater than 2.5mm is pulled out from the outlet of the horizontal annealing furnace 7. The uncoiler 1 is controlled to reverse the winding and the broken rear section 23 of the hot-dip galvanized steel strip 2 with a thickness greater than 2.5mm is pulled back. The hot-dip galvanized steel strip 2 with a thickness greater than 2.5mm is removed from the uncoiler 1. S2. Place the hot-dip galvanized steel strip 17 with a thickness of ≤1.5mm into the uncoiler 1, cut the end of the hot-dip galvanized steel strip 17 with a thickness of ≤1.5mm into a trapezoidal surface structure to form a strip head 18, and weld the strip threading triangular ring 19 to the strip head 18. S3. After the uncoiler 1 discharges the material, it conveys the hot-dip galvanized steel strip 2 with a thickness of ≤1.5mm to the inlet of the horizontal annealing furnace 7; the threading rod 15 is lifted and placed on the idler roller 16 at the inlet of the horizontal annealing furnace 7. The threading rod 15 is connected to the threading triangle ring 19 through the chain 20, and the threading rod 15 is pushed to the middle position of the idler roller 16. S4. The action of the idler roller 16 drives the threading bar 15 to move towards the outlet of the horizontal annealing furnace 7. After it moves into place, the threading triangular ring 19 is cut, and the head 18 of the hot-dip galvanized steel strip 17 with a thickness of ≤1.5mm and the end of the broken section 23 of the hot-dip galvanized steel strip 2 with a thickness of >2.5mm are welded together. S5. Feed out hot-dip galvanized steel strip 17 with a thickness of ≤1.5mm and process the steel strip. After feeding out hot-dip galvanized steel strip 17 with a thickness of ≤1.5mm, replace it with hot-dip galvanized steel strip 2 with a thickness of >2.5mm and process the hot-dip galvanized steel strip 2 with a thickness of >2.5mm.

[0007] After the uncoiler 1 discharges the material, the hot-dip galvanized steel strip 2 with a thickness greater than 2.5mm passes over the No. 1 tension roller 3 and enters the inlet looper 5 of the multi-layer running strip. The hot-dip galvanized steel strip 2 with a thickness greater than 2.5mm undergoes surface cleaning in the cleaning section 4. The hot-dip galvanized steel strip 2 with a thickness greater than 2.5mm passes over the No. 2 tension roller 6 and enters the horizontal annealing furnace 7 for annealing heating and rapid cooling treatment. Then, the hot-dip galvanized steel strip 2 with a thickness greater than 2.5mm passes through the hot tension roller 8 and the grate 10 into the zinc pot 12 for hot-dip galvanizing. The hot-dip galvanized steel strip 2 with a thickness greater than 2.5mm passes through the zinc pot submerged roller and the stabilizing roller 11 and exits the zinc pot into the cooling tower cooling air box 13 and the cooling tower top roller 14 for cooling, completing the annealing and galvanizing process of the strip.

[0008] When the hot-dip galvanized steel strip 2 with a thickness greater than 2.5mm breaks inside the horizontal annealing furnace 7, the furnace is stopped for purging, cooling, and the zinc pot sinking roller and stabilizing roller 11 are lifted out. The zinc pot 12 is moved to the offline position, and the front section 22 of the hot-dip galvanized steel strip 2 with a thickness greater than 2.5mm is pulled out until it is above the zinc pot 12. The rear section 23 of the broken strip is pulled to the entrance position of the horizontal annealing furnace 7 by the reverse jogging operation of the No. 2 tension roller 6.

[0009] When controlling the uncoiler 1 to reverse-wind the hot-dip galvanized steel strip 2 with a thickness greater than 2.5mm, the 2# tension roller 6, the cleaning section 4, and the inlet loop 5 are operated in reverse jog to allow the hot-dip galvanized steel strip 2 with a thickness greater than 2.5mm to retract into the inlet loop 5. Then, the inlet loop 5 and the uncoiler 1 are operated, and the hot-dip galvanized steel strip 2 with a thickness greater than 2.5mm runs in reverse through the inlet loop 5 and the 1# tension roller 3 until the hot-dip galvanized steel strip 2 with a thickness greater than 2.5mm is completely reverse-winded and retracted.

[0010] After the uncoiler 1 discharges the hot-dip galvanized steel strip 2 with a thickness of ≤1.5mm, it is conveyed to the inlet of the horizontal annealing furnace 7. After the uncoiler 1 discharges the material back, before the hot-dip galvanized steel strip 17 with a thickness of ≤1.5mm enters the No. 1 tension roller 3, the end of the hot-dip galvanized steel strip 17 is cut by gas cutting to form a strip head 18. The strip head 18 is not easy to get stuck during the threading process. The triangular ring 19 is welded to the strip head 18, and the hot-dip galvanized steel strip 17 with a thickness of ≤1.5mm is conveyed to the rear of the No. 2 tension roller 6 near the horizontal annealing furnace 7.

[0011] When the threading bar 15 is lifted and placed on the roller 16 at the inlet of the horizontal annealing furnace 7, the threading bar 15 is lifted and placed on the roller 16 at the inlet of the horizontal annealing furnace 7 by a crane. The threading bar 15 is connected to the triangular ring 19 through the chain 20 and the connecting bolt hole. The threading bar 15 pulls the hot-dip galvanized steel strip 17 with a thickness of ≤1.5mm to move.

[0012] The threading rod 15 pulls the hot-dip galvanized steel strip 17 with a thickness of ≤1.5mm towards the outlet of the horizontal annealing furnace 7. The hot-dip galvanized steel strip 17 with a thickness of ≤1.5mm is continuously threaded to the positions of roller #1 and roller #2 at the hot tension roller 8. The threading rod 15 leaves the horizontal annealing furnace 7 through the threading hole 9 at the outlet of the horizontal annealing furnace 7. The threading rod 15 is then collected by a crane until it is completely pulled out of the horizontal annealing furnace 7 and lifted away.

[0013] Hot-dip galvanized steel strip 17 with a thickness of ≤1.5mm is conveyed to the bottom platform of zinc pot 11 through rollers 1# and 2# of hot tension roller 8 and zinc nose 10. The broken front section 22 of hot-dip galvanized steel strip 2 with a thickness of >2.5mm is pulled out above zinc pot 12. The cooling tower top roller 14 is jogged, and hot-dip galvanized steel strip 2 with a thickness of >2.5mm falls into the bottom platform of zinc pot 12 through the cooling tower top roller 14 and cooling tower cooling air box 13. The head 18 of hot-dip galvanized steel strip 17 with a thickness of ≤1.5mm and the broken front section 22 of hot-dip galvanized steel strip 2 are welded together.

[0014] When hot-dip galvanized steel strip ≤1.5mm thick is unloaded, the following components are started: uncoiler 1, tension roller 1# 3, inlet looper 5, cleaning section 4, tension roller 2# 6, horizontal annealing furnace 7, hot tension roller 8, grate 10, submerged roller 11, cooling tower cooling air box 13, and cooling tower top roller 14 to process the steel strip.

[0015] The No. 1 tensioning roller 3 and No. 2 tensioning roller 6 are both four-roll tensioning rollers, and the hot tensioning roller 8 includes two tensioning rollers.

[0016] The working principle and beneficial effects of the technical solution adopted in this invention are as follows: The present invention provides a rapid treatment method for hot-dip galvanized steel strip with a thickness greater than 2.5mm in the horizontal annealing furnace. By improving the furnace threading method for steel strips with an extreme thickness of >2.5mm, the method can significantly reduce the treatment time for steel strips with a thickness greater than 2.5mm in the horizontal annealing furnace, thereby improving production efficiency, reducing labor intensity, and ensuring personnel safety during accident handling. Attached Figure Description

[0017] The following is a brief explanation of the contents depicted in the accompanying drawings and the markings therein: Figure 1 This is a schematic diagram of the rapid treatment method for hot-dip galvanized steel strip with a thickness >2.5mm in a horizontal annealing furnace according to the present invention. Figure 2 This is a schematic diagram of the rapid treatment method for hot-dip galvanized steel strip with a thickness >2.5mm in a horizontal annealing furnace according to the present invention. Figure 3 This is a schematic diagram of the rapid treatment method for hot-dip galvanized steel strip with a thickness >2.5mm in a horizontal annealing furnace according to the present invention. Figure 4 This is a schematic diagram of the rapid treatment method for hot-dip galvanized steel strip with a thickness >2.5mm in a horizontal annealing furnace according to the present invention. The labels in the attached diagram are as follows: 1. Uncoiler; 2. Hot-dip galvanized steel strip with a thickness >2.5mm; 3. Tensioner #1; 4. Cleaning section; 5. Inlet looper; 6. Tensioner #2; 7. Horizontal annealing furnace; 8. Hot tension roller; 9. Threading hole; 10. Grate; 11. Zinc pot submerged roller and stabilizing roller; 12. Zinc pot; 13. Cooling tower air box; 14. Cooling tower top roller; 15. Threading bar; 16. Furnace roller; 17. Hot-dip galvanized steel strip with a thickness ≤1.5mm; 18. Strip head; 19. Threading triangular ring; 20. Connecting chain; 21. Connecting bolt hole; 22. Front section of strip breakage; 23. Rear section of strip breakage. Detailed Implementation

[0018] The following description, with reference to the accompanying drawings, provides a more detailed explanation of the specific embodiments of the present invention, including the shape and structure of each component, the relative positions and connections between the parts, the functions and working principles of each part: As attached Figure 1 - Appendix Figure 4 As shown, the present invention is a method for rapid treatment of hot-dip galvanized steel strip with a thickness of >2.5mm in a horizontal annealing furnace. The hot-dip galvanized steel strip 2 with a thickness of >2.5mm is placed into the uncoiler 1, the uncoiler 1 feeds the material, the horizontal annealing furnace 7 continuously feeds into the inlet and continuously feeds out the outlet of the horizontal annealing furnace 7. S1. When the hot-dip galvanized steel strip 2 with a thickness greater than 2.5mm breaks inside the horizontal annealing furnace 7, both the uncoiler 1 and the horizontal annealing furnace 7 stop. The broken front section 22 of the hot-dip galvanized steel strip 2 is pulled out from the outlet of the horizontal annealing furnace 7. The uncoiler 1 is controlled to reverse the winding, and the broken rear section 23 of the hot-dip galvanized steel strip 2 is retracted and removed from the uncoiler 1. S2. The hot-dip galvanized steel strip 17 with a thickness less than 1.5mm is placed on the uncoiler 1. The end of the hot-dip galvanized steel strip 17 with a thickness less than 1.5mm is cut into a trapezoidal surface structure to form a strip head 18. The threading triangular ring 19 is welded to the strip head 18. S3. After the uncoiler 1 discharges the material, it conveys the hot-dip galvanized steel strip 2 with a thickness less than 1.5mm to the inlet of the horizontal annealing furnace 7. The process involves: S4. Lifting the threading rod 15 and placing it on the support roller 16 at the inlet of the horizontal annealing furnace 7. The threading rod 15 is connected to the threading triangular ring 19 via a chain 20, and the threading rod 15 is pushed to the middle position of the support roller 16; S5. The support roller 16 moves the threading rod 15 towards the outlet of the horizontal annealing furnace 7. After it reaches the desired position, the threading triangular ring 19 is cut, and the head 18 of the hot-dip galvanized steel strip ≤1.5mm thick and the broken end 23 of the hot-dip galvanized steel strip 2 are welded together; S6. The hot-dip galvanized steel strip ≤1.5mm thick is fed out for processing. After the hot-dip galvanized steel strip ≤1.5mm thick is fed out, the hot-dip galvanized steel strip 2 >2.5mm thick is replaced and processed. The above structure addresses the shortcomings of the existing technology by proposing an improved technical solution. The method of the present invention, through the improvement of the in-furnace strip threading method for maximum thickness specifications, can significantly reduce the strip breakage handling time in the horizontal annealing furnace when the strip with a maximum thickness specification of >2.5mm breaks, thereby improving production efficiency, reducing labor intensity, and ensuring personnel safety during accident handling.

[0019] After the uncoiler 1 discharges the material, the hot-dip galvanized steel strip 2 with a thickness greater than 2.5mm passes over the No. 1 tension roller 3 and enters the inlet looper 5 of the multi-layer running strip. The hot-dip galvanized steel strip 2 with a thickness greater than 2.5mm undergoes surface cleaning in the cleaning section 4. The hot-dip galvanized steel strip 2 with a thickness greater than 2.5mm passes over the No. 2 tension roller 6 and enters the horizontal annealing furnace 7 for annealing heating and rapid cooling treatment. Then, the hot-dip galvanized steel strip 2 with a thickness greater than 2.5mm passes through the hot tension roller 8 and the grate 10 into the zinc pot 12 for hot-dip galvanizing. The hot-dip galvanized steel strip 2 with a thickness greater than 2.5mm passes through the zinc pot submerged roller and the stabilizing roller 11 and exits the zinc pot into the cooling tower cooling air box 13 and the cooling tower top roller 14 for cooling, completing the annealing and galvanizing process of the strip.

[0020] When the hot-dip galvanized steel strip 2 with a thickness greater than 2.5mm breaks inside the horizontal annealing furnace 7, the furnace is stopped for purging, cooling, and the zinc pot sinking roller and stabilizing roller 11 are lifted out. The zinc pot 12 is moved to the offline position, and the front section 22 of the hot-dip galvanized steel strip 2 with a thickness greater than 2.5mm is pulled out until it is above the zinc pot 12. The rear section 23 of the broken strip is pulled to the entrance position of the horizontal annealing furnace 7 by the reverse jogging operation of the No. 2 tension roller 6.

[0021] When controlling the uncoiler 1 to reverse-wind the hot-dip galvanized steel strip 2 with a thickness greater than 2.5mm, the 2# tension roller 6, the cleaning section 4, and the inlet loop 5 are operated in reverse jog to allow the hot-dip galvanized steel strip 2 with a thickness greater than 2.5mm to retract into the inlet loop 5. Then, the inlet loop 5 and the uncoiler 1 are operated, and the hot-dip galvanized steel strip 2 with a thickness greater than 2.5mm runs in reverse through the inlet loop 5 and the 1# tension roller 3 until the hot-dip galvanized steel strip 2 with a thickness greater than 2.5mm is completely reverse-winded and retracted.

[0022] After the uncoiler 1 discharges the hot-dip galvanized steel strip 2 with a thickness of ≤1.5mm, it is conveyed to the inlet of the horizontal annealing furnace 7. After the uncoiler 1 discharges the material back, before the hot-dip galvanized steel strip 17 with a thickness of ≤1.5mm enters the No. 1 tension roller 3, the end of the hot-dip galvanized steel strip 17 is cut by gas cutting to form a strip head 18. The strip head 18 is not easy to get stuck during the threading process. The triangular ring 19 is welded to the strip head 18, and the hot-dip galvanized steel strip 17 with a thickness of ≤1.5mm is conveyed to the rear of the No. 2 tension roller 6 near the horizontal annealing furnace 7.

[0023] When the threading bar 15 is lifted and placed on the roller 16 at the inlet of the horizontal annealing furnace 7, the threading bar 15 is lifted and placed on the roller 16 at the inlet of the horizontal annealing furnace 7 by a crane. The threading bar 15 is connected to the triangular ring 19 through the chain 20 and the connecting bolt hole. The threading bar 15 pulls the hot-dip galvanized steel strip 17 with a thickness of ≤1.5mm to move.

[0024] The threading rod 15 pulls the hot-dip galvanized steel strip 17 with a thickness of ≤1.5mm towards the outlet of the horizontal annealing furnace 7. The hot-dip galvanized steel strip 17 with a thickness of ≤1.5mm is continuously threaded to the positions of roller #1 and roller #2 at the hot tension roller 8. The threading rod 15 leaves the horizontal annealing furnace 7 through the threading hole 9 at the outlet of the horizontal annealing furnace 7. The threading rod 15 is then collected by a crane until it is completely pulled out of the horizontal annealing furnace 7 and lifted away.

[0025] Hot-dip galvanized steel strip 17 with a thickness of ≤1.5mm is conveyed to the bottom platform of zinc pot 11 through rollers 1# and 2# of hot tension roller 8 and zinc nose 10. The broken front section 22 of hot-dip galvanized steel strip 2 with a thickness of >2.5mm is pulled out above zinc pot 12. The cooling tower top roller 14 is jogged, and hot-dip galvanized steel strip 2 with a thickness of >2.5mm falls into the bottom platform of zinc pot 12 through the cooling tower top roller 14 and cooling tower cooling air box 13. The head 18 of hot-dip galvanized steel strip 17 with a thickness of ≤1.5mm and the broken front section 22 of hot-dip galvanized steel strip 2 are welded together.

[0026] When hot-dip galvanized steel strip ≤1.5mm thick 17 is unloaded, the uncoiler 1, No. 1 tension roller 3, entrance looper 5, cleaning section 4, No. 2 tension roller 6, horizontal annealing furnace 7, hot tension roller 8, grate 10, submerged roller 11, cooling tower cooling air box 13 and cooling tower top roller 14 are started to process the steel strip.

[0027] The No. 1 tensioning roller 3 and No. 2 tensioning roller 6 are both four-roll tensioning rollers, and the hot tensioning roller 8 includes two tensioning rollers.

[0028] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any improvements made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A method for rapid treatment of strip breakage in a horizontal annealing furnace for hot-dip galvanized steel strip with a thickness >2.5mm, characterized in that: Hot-dip galvanized steel strip (2) with a thickness of >2.5mm is placed into the uncoiler (1), the uncoiler (1) feeds the material, the horizontal annealing furnace (7) continuously feeds in at the inlet, and the horizontal annealing furnace (7) continuously discharges out at the outlet; S1. When the hot-dip galvanized steel strip (2) with a thickness of >2.5mm breaks in the horizontal annealing furnace (7), both the uncoiler (1) and the horizontal annealing furnace (7) are stopped. The front section (22) of the hot-dip galvanized steel strip (2) with a thickness of >2.5mm is pulled out from the outlet of the horizontal annealing furnace (7). The uncoiler (1) is controlled to reverse and the rear section (23) of the hot-dip galvanized steel strip (2) with a thickness of >2.5mm is pulled back. The hot-dip galvanized steel strip (2) with a thickness of >2.5mm is taken off the uncoiler (1). S2. Place the hot-dip galvanized steel strip (17) with a thickness of ≤1.5mm into the uncoiler (1), cut the end of the hot-dip galvanized steel strip (17) with a thickness of ≤1.5mm into a trapezoidal surface structure to form a strip head (18), and weld the strip threading triangular ring (19) to the strip head (18); S3. After the uncoiler (1) feeds the hot-dip galvanized steel strip (2) with a thickness of ≤1.5mm, it enters the inlet of the horizontal annealing furnace (7); the threading bar (15) is lifted and placed on the idler roller (16) at the inlet of the horizontal annealing furnace (7). The threading bar (15) is connected to the threading triangle ring (19) by the chain (20), and the threading bar (15) is pushed to the middle position of the idler roller (16). S4. The action of the idler roller (16) drives the threading bar (15) to move towards the outlet of the horizontal annealing furnace (7). After it moves into place, the threading triangular ring (19) is cut, and the head (18) of the hot-dip galvanized steel strip (17) with a thickness of ≤1.5mm and the end of the broken section (23) of the hot-dip galvanized steel strip (2) with a thickness of >2.5mm are welded together. S5. Hot-dip galvanized steel strip (17) with a thickness of ≤1.5mm is fed out and processed. After the hot-dip galvanized steel strip (17) with a thickness of ≤1.5mm is fed out, hot-dip galvanized steel strip (2) with a thickness of >2.5mm is fed out and processed.

2. The method for rapid treatment of strip breakage in a horizontal annealing furnace for hot-dip galvanized steel strip with a thickness >2.5mm, as described in claim 1, is characterized in that: After the uncoiler (1) discharges the material, the hot-dip galvanized steel strip (2) with a thickness of >2.5mm passes over the No. 1 tension roller (3) and enters the inlet loop (5) of the multi-layer running strip. The hot-dip galvanized steel strip (2) passes through the cleaning section (4) for surface cleaning. The hot-dip galvanized steel strip (2) then passes over the No. 2 tension roller (6) and enters the horizontal annealing furnace (7) for annealing heating treatment and rapid cooling treatment. Then, the hot-dip galvanized steel strip (2) passes through the hot tension roller (8) and the grate (10) and enters the zinc pot (12) for hot-dip galvanizing. The hot-dip galvanized steel strip (2) passes through the zinc pot sinking roller and the stabilizing roller (11) and exits the zinc pot into the cooling tower cooling air box (13) and the cooling tower top roller (14) for cooling, thus completing the annealing and galvanizing process of the strip.

3. The method for rapid treatment of strip breakage in a horizontal annealing furnace for hot-dip galvanized steel strip with a thickness >2.5mm, as described in claim 1, is characterized in that: When the hot-dip galvanized steel strip (2) with a thickness of >2.5mm breaks in the horizontal annealing furnace (7), the furnace is stopped, the strip is purged, the temperature is lowered, the zinc pot sinking roller and stabilizing roller (11) are lifted out, the zinc pot (12) is moved to the offline position, the front section (22) of the hot-dip galvanized steel strip (2) with a thickness of >2.5mm is pulled out until it is above the zinc pot (12), and the rear section (23) of the strip is pulled to the entrance position of the horizontal annealing furnace (7) by the reverse jogging operation of the No. 2 tensioning roller (6).

4. The method for rapid treatment of strip breakage in a horizontal annealing furnace for hot-dip galvanized steel strip with a thickness >2.5mm, as described in claim 1 or 2, is characterized in that: When the uncoiler (1) reverses the winding of the hot-dip galvanized steel strip (2) with a thickness of >2.5mm, the No. 2 tension roller (6), the cleaning section (4), and the inlet loop (5) are moved in reverse jog to allow the hot-dip galvanized steel strip (2) with a thickness of >2.5mm to retract into the inlet loop (5). Then, the inlet loop (5) and the uncoiler (1) are operated, and the hot-dip galvanized steel strip (2) with a thickness of >2.5mm runs in reverse through the inlet loop (5) and the No. 1 tension roller (3) until the hot-dip galvanized steel strip (2) with a thickness of >2.5mm is completely reversed and retracted.

5. The method for rapid treatment of strip breakage in a horizontal annealing furnace for hot-dip galvanized steel strip with a thickness >2.5mm, as described in claim 1 or 2, is characterized in that: When the uncoiler (1) feeds the hot-dip galvanized steel strip (2) with a thickness of ≤1.5mm into the inlet of the horizontal annealing furnace (7), before the hot-dip galvanized steel strip (17) with a thickness of ≤1.5mm enters the No.1 tension roller (3), the head of the hot-dip galvanized steel strip (17) is cut by gas cutting to form a head (18). The head (18) is not easy to get stuck during the threading process. The triangular ring (19) is welded to the head (18), and the hot-dip galvanized steel strip (17) with a thickness of ≤1.5mm is conveyed to the rear of the No.2 tension roller (6) near the horizontal annealing furnace (7).

6. The method for rapid treatment of strip breakage in a horizontal annealing furnace for hot-dip galvanized steel strip with a thickness >2.5mm, as described in claim 1 or 2, is characterized in that: When the threading bar (15) is lifted and placed on the roller (16) at the inlet of the horizontal annealing furnace (7), the threading bar (15) is lifted and placed on the roller (16) at the inlet of the horizontal annealing furnace (7) by a crane. The threading bar (15) and the triangular ring (19) are connected by a chain (20) and connecting bolt holes. The threading bar (15) pulls the hot-dip galvanized steel strip (17) with a thickness of ≤1.5mm to move.

7. The method for rapid treatment of strip breakage in a horizontal annealing furnace for hot-dip galvanized steel strip with a thickness >2.5mm, as described in claim 6, is characterized in that: The threading rod (15) pulls the hot-dip galvanized steel strip (17) with a thickness of ≤1.5mm towards the outlet of the horizontal annealing furnace (7). The hot-dip galvanized steel strip (17) with a thickness of ≤1.5mm is continuously threaded to the positions of roller #1 and roller #2 at the hot tension roller (8). The threading rod (15) leaves the horizontal annealing furnace (7) through the threading hole (9) at the outlet of the horizontal annealing furnace (7). The threading rod (15) is collected by using a crane until all the threading rods (15) are pulled out of the horizontal annealing furnace (7) and lifted away.

8. The method for rapid treatment of strip breakage in a horizontal annealing furnace for hot-dip galvanized steel strip with a thickness >2.5mm, as described in claim 7, is characterized in that: Hot-dip galvanized steel strip (17) with a thickness of ≤1.5mm is conveyed to the bottom platform of the zinc pot (11) by the No.1 roller, No.2 roller and zinc nose (10) of the hot tension roller (8). The broken front section (22) of the hot-dip galvanized steel strip (2) with a thickness of >2.5mm is pulled out above the zinc pot (12). The cooling tower top roller (14) is operated and the hot-dip galvanized steel strip (2) with a thickness of >2.5mm is jogged and falls into the bottom platform of the zinc pot (12) by the cooling tower top roller (14) and the cooling tower cooling air box (13). The head (18) of the hot-dip galvanized steel strip (17) with a thickness of ≤1.5mm and the broken front section (22) of the hot-dip galvanized steel strip (2) with a thickness of >2.5mm are welded together.

9. The method for rapid treatment of strip breakage in a horizontal annealing furnace for hot-dip galvanized steel strip with a thickness >2.5mm, as described in claim 8, is characterized in that: When hot-dip galvanized steel strip (17) with a thickness of ≤1.5mm is unloaded, the uncoiler (1), No. 1 tension roller (3), inlet looper (5), cleaning section (4), No. 2 tension roller (6), horizontal annealing furnace (7), hot tension roller (8), grate (10), submerged roller (11), cooling tower cooling air box (13) and cooling tower top roller (14) are started to process the steel strip.

10. The method for rapid treatment of strip breakage in a horizontal annealing furnace for hot-dip galvanized steel strip with a thickness >2.5mm, as described in claim 1 or 2, is characterized in that: The No. 1 tensioning roller (3) and No. 2 tensioning roller (6) are both four-roll tensioning rollers, and the hot tensioning roller (8) includes two tensioning rollers.

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