Pickling mill unit

Abstract

The invention provides an acid rolling unit, and relates to the technical field of steel processing equipment, the acid rolling unit comprises an acid pickling section device and a rolling mill section device, the acid pickling section device comprises an acid pickling inlet device, a welding machine, an acid pickling inlet loop, a withdrawal and straightening machine, an acid pickling process section and a rinsing section which are connected in sequence; the rolling mill section equipment comprises rolling mill inlet equipment, a continuous rolling mill, a composite flying shear and a coiling machine which are sequentially connected, the pickling section equipment and the rolling mill section equipment are connected through a joint loop, the pickling section equipment is arranged in a three-row parallel mode, the arrangement direction of the three rows is perpendicular to the ground plane, and the pickling inlet equipment and the welding machine are arranged in the second row; the pickling inlet loop is arranged in the first row, the withdrawal and straightening machine, the pickling process section and the rinsing section are arranged in the third row, the combined loop is aligned with the second row, the rolling mill inlet equipment is arranged below the ground plane, the pickling section equipment is arranged in a multi-row parallel mode, and part of the rolling mill section equipment is arranged below the ground plane, so that the space is effectively utilized; and the length of the unit is obviously shortened.

Description

Technical Field

[0001] The invention relates to the technical field of steel processing equipment, and in particular to a pickling mill unit. Background Art

[0002] With the rapid development of the global steel industry, cold-rolled steel sheets, as important basic materials, play a vital role in many fields such as automobile manufacturing, home appliance production, and construction. As the core equipment in the cold rolling production line, the pickling mill has the main function of removing the iron oxide scale on the surface of the steel sheet by pickling, and then rolling to achieve the required thickness and surface quality.

[0003] However, due to the complex process flow and numerous equipment, the total length of the traditional pickling mill is generally more than 300 meters, and even requires a plant length of more than 400 meters to accommodate it, which poses a great challenge to enterprises with insufficient preliminary planning or limited land acquisition area. Deploying such a unit in an existing plant often means sacrificing other production facilities or carrying out large-scale site transformation, which increases the investment cost and operation difficulty of the enterprise. In addition to the large area occupied, the traditional pickling mill also has the problem of high energy consumption. Long-distance material transmission, complex process flow and mutual waiting between equipment have all led to a large amount of energy consumption, which not only increases the operating cost of the enterprise, but also runs counter to the current global green, low-carbon, energy-saving and emission reduction concept. Summary of the invention

[0004] The problem solved by the invention is: how to provide a layout and connection mode of a pickling mill unit which can reduce floor space and energy consumption, so as to meet the needs of enterprises with insufficient preliminary planning or limited land acquisition area, and at the same time improve production efficiency.

[0005] To solve the above problems, the present invention provides a pickling mill group, comprising: a pickling section equipment and a rolling mill section equipment, the pickling section equipment comprising a pickling entrance equipment, a welding machine, a pickling entrance looper, a straightening machine, a pickling process section and a rinsing section connected in sequence, the rolling mill section equipment comprising a rolling mill entrance equipment, a continuous rolling mill, a compound flying shear and a coiler connected in sequence, the pickling section equipment and the rolling mill section equipment are connected through a combined looper, the pickling section equipment is arranged in three rows in parallel and the arrangement direction of the three rows is perpendicular to the ground plane, the pickling entrance equipment and the welding machine are arranged in the second row, the pickling entrance looper is arranged in the first row, the straightening machine, the pickling process section and the rinsing section are arranged in the third row, the combined looper is aligned with the second row and connects the rinsing section and the rolling mill entrance equipment, the rolling mill entrance equipment is arranged below the ground plane, and the continuous rolling mill, the compound flying shear and the coiler are set on the ground.

[0006] Optionally, the pickling inlet equipment and the welding machine are arranged on a side of the pickling process section close to the straightening machine, and the combined looper is arranged in a plurality of stacked manners.

[0007] Optionally, the combined loop is arranged in six layers.

[0008] Optionally, the rolling mill entrance equipment includes a first deflection correction roller, a tension roller and a second deflection correction roller, the first deflection correction roller is connected to the combined loop, the second deflection correction roller is connected to the continuous rolling mill, the first deflection correction roller and the second deflection correction roller are arranged perpendicular to the ground and the first deflection correction roller and the second deflection correction roller are below the ground plane, the tension roller is connected between the first deflection correction roller and the second deflection correction roller, and the tension roller is below the ground plane.

[0009] Optionally, a traffic passage is provided on the ground above the rolling mill entrance equipment.

[0010] Optionally, the continuous rolling mill comprises a plurality of connected rolling mill assemblies, and the spacing between the rolling mill assemblies is L1, where L1≤4500mm.

[0011] Optionally, the compound flying shear comprises an integrated pre-shearing feed roller, a flying shear and a post-shearing steering roller.

[0012] Optionally, the coiler is a turntable coiler.

[0013] Optionally, the distance between the rolling mill assembly close to one side of the composite flying shear and the coil unloading position of the coiler is L2, and L2≤9000mm.

[0014] Optionally, the length of the acid rolling mill in the horizontal direction is L3, L3≤2000m

[0015] The beneficial effect of the pickling mill unit of the present invention is that when working, the steel plate first enters the pickling section equipment, starting from the pickling entrance equipment. The steel plate is welded with other steel plates at the welding machine to form a continuous strip, and then enters the pickling entrance looper for temporary storage to adjust the production rhythm and match the speed of the previous and next processes. After the steel plate comes out of the looper, it is straightened by the straightening machine, and then enters the pickling process section for pickling to remove the surface oxide scale. The pickled steel plate enters the rinsing section for cleaning to remove the residual acid liquid. Subsequently, the steel plate is connected to the rolling mill section equipment through the joint looper, and the joint looper also plays the role of adjusting the production rhythm and storing the steel plate, ensuring that the steel plate can smoothly transition from the pickling section equipment to the rolling mill section equipment. After the steel plate enters the rolling mill section equipment from the joint looper, it is rolled by the continuous rolling mill to reach the required thickness, and then sheared by the composite flying shear, and finally coiled by the coiler.

[0016] The pickling section equipment of the present invention adopts a multi-row parallel layout, arranges different equipment of the pickling section equipment in different rows, and arranges part of the equipment of the rolling mill section equipment below the ground level, which significantly reduces the floor space of the unit. For enterprises with insufficient preliminary planning or limited land acquisition area, it provides great convenience and reduces site transformation and investment costs. The use of combined loops can adjust the production rhythm and ensure the smooth transition of steel plates between the pickling section equipment and the rolling mill section equipment, reducing the mutual waiting time between equipment, thereby improving production efficiency. Due to the reduction in floor space and the improvement in production efficiency, the pickling rolling unit of the present invention can reduce the distance and time of material transmission compared to traditional units, thereby reducing energy consumption, which is in line with the current green and low-carbon, energy-saving and emission-reduction concepts advocated globally, and helps to reduce the operating costs of enterprises. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The figure is a schematic structural diagram of a pickling mill according to an embodiment of the present invention.

[0018] Description of reference numerals:

[0019] 1. Pickling section equipment; 11. Pickling entrance equipment; 12. Welding machine; 13. Pickling entrance looper; 14. Straightening machine; 15. Pickling process section; 16. Rinsing section; 2. Rolling mill section equipment; 21. Rolling mill entrance equipment; 211. First deviation-correcting roller; 212. Tension roller; 213. Second deviation-correcting roller; 22. Continuous rolling mill; 23. Compound flying shear; 24. Coiler; 3. Combined looper. DETAILED DESCRIPTION

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be interpreted as being limited to the embodiments described herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

[0021] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to"; the term "based on" means "based at least in part on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc. mentioned in the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0022] It should be noted that the modifications of "one" and "plurality" mentioned in the present invention are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0023] like Figure 1 As shown, an embodiment of the present invention provides a pickling mill group, comprising: a pickling section device 1 and a rolling mill section device 2, wherein the pickling section device 1 comprises a pickling inlet device 11, a welding machine 12, a pickling inlet looper 13, a straightening machine 14, a pickling process section 15 and a rinsing section 16 connected in sequence, and the rolling mill section device 2 comprises a rolling mill inlet device 21, a continuous rolling mill 22, a composite flying shear 23 and a coiler 24 connected in sequence, and the pickling section device 1 and the rolling mill section device 2 are connected through a joint looper 3, and the pickling section The equipment 1 is arranged in three parallel rows and the arrangement direction of the three rows is perpendicular to the ground plane. The pickling entrance equipment 11 and the welding machine 12 are arranged in the second row, the pickling entrance looper 13 is arranged in the first row, the straightening machine 14, the pickling process section 15, and the rinsing section 16 are arranged in the third row, the combined looper 3 is aligned with the second row and connects the rinsing section 16 and the rolling mill entrance equipment 21. The rolling mill entrance equipment 21 is arranged below the ground plane, and the continuous rolling mill 22, the compound flying shear 23 and the coiler 24 are set on the ground.

[0024] In this embodiment, the extension direction of each row in the pickling section equipment 1 is defined as the length direction, that is, the length direction of the unit, and the arrangement direction of each row in the pickling section equipment 1 is defined as the height direction, that is, the height direction of the unit.

[0025] Specifically, the pickling mill unit includes two major parts, namely, the pickling section equipment 1 and the rolling mill section equipment 2. The pickling section equipment 1 is arranged in three rows in parallel, specifically divided into the first row, the second row and the third row arranged in sequence. The straightening machine 14, the pickling process section 15 and the rinsing section 16 are arranged in the third row, that is, the straightening machine 14, the pickling process section 15 and the rinsing section 16 are arranged in sequence along the extension direction of the third row, the pickling inlet equipment 11 and the welding machine 12 are arranged in the second row, that is, the pickling inlet equipment 11 and the welding machine 12 are arranged in sequence along the extension direction of the second row, and the pickling inlet looper 13 is arranged in the first row, which effectively utilizes the space and reduces the length of the pickling mill unit. The pickling section equipment 1 of this embodiment adopts the strip offline trimming technology, that is, the steel plate that has completed the trimming process is fed into the pickling inlet equipment 11, and the pre-shear looper, disc shear and other equipment arranged after the rinsing section 16 in the traditional pickling mill unit are cancelled, which provides space for the compact arrangement of the unit. The rolling mill section equipment 2 is mainly arranged on the ground, wherein the rolling mill entrance equipment 21 is arranged below the ground level, which helps to further reduce the overall height of the unit and facilitates efficient connection with the pickling section equipment 1 through the joint looper 3. The joint looper 3, as a component connecting the pickling section equipment 1 and the rolling mill section equipment 2, is aligned with the second row and connected to the rinsing section 16 and the rolling mill entrance equipment 21 at the end of the third row, which can not only realize the smooth transition of materials between the two units, but also optimize the production rhythm through buffering, reduce the mutual waiting time between equipment, and thus reduce energy consumption.

[0026] In this embodiment, the pickling section equipment 1 adopts a multi-row parallel layout, arranges different equipment of the pickling section equipment 1 in rows of different heights, and arranges part of the equipment of the rolling mill section equipment 2 below the ground level, which effectively utilizes the space and significantly reduces the footprint of the unit. For enterprises with insufficient preliminary planning or limited land acquisition area, it provides great convenience and reduces site transformation and investment costs. The use of the combined loop 3 can adjust the production rhythm and ensure the smooth transition of the steel plate between the pickling section equipment 1 and the rolling mill section equipment 2, reducing the mutual waiting time between equipment, thereby improving production efficiency. Due to the reduction in floor space and the improvement in production efficiency, the pickling rolling unit of the present invention can reduce the distance and time of material transmission compared to traditional units, thereby reducing energy consumption, which is in line with the current global green, low-carbon, energy-saving and emission reduction concepts, and helps to reduce the operating costs of enterprises.

[0027] Optionally, the pickling inlet device 11 and the welding machine 12 are arranged on one side of the pickling process section 15 close to the straightening machine 14, and the joint looper 3 is arranged in a stacked manner.

[0028] Specifically, the stacked joint looper 3 can flexibly adjust the height and position of different levels according to the needs of material flow, thereby ensuring that the material can smoothly transition from one unit to another. At the same time, since the equipment layout is more compact and the material transmission distance is shortened, it also helps to reduce the energy consumption of the entire production line.

[0029] In this optional embodiment, the pickling inlet equipment 11 and the welding machine 12 are arranged on the side of the pickling process section 15 close to the straightening machine 14, and space is reserved for the joint looper 3 to be arranged in the second row. The joint looper 3 is arranged in the second row and is located on the side of the pickling process section 15 close to the rinsing section 16, so that the joint looper 3 can be avoided to be located between the pickling section equipment 1 and the rolling mill section equipment 2 to increase the length of the entire unit, and the connection between the joint looper 3 and the rinsing section 16 is convenient. Through the stacked arrangement, the joint looper 3 can be installed more compactly between the units, making full use of the space in the second row of the pickling section equipment 1, and by increasing the number of looper layers and reducing the total stroke of the online looper, it is possible to arrange the inlet equipment and the online looper on the same floor, reducing the requirements for the height of the plant, and also providing more space for the arrangement of other equipment, which helps to reduce the investment cost and operation difficulty of the enterprise. The stacked joint looper 3 can reduce the loss and energy consumption of the material during the transition process by optimizing the material flow path. At the same time, since the equipment layout is more compact and the material transmission distance is shortened, it also helps to reduce the energy consumption of the entire production line.

[0030] Optionally, the joint looper 3 is arranged in six layers.

[0031] Specifically, the six-layer stacked joint looper 3 can ensure the smooth flow of materials between the pickling mills, while providing sufficient buffering capacity to cope with fluctuations in the production process.

[0032] In this optional embodiment, the six-layer stacked joint looper 3 provides a larger material buffer space, making the production line more flexible in dealing with production fluctuations, helping to reduce production interruptions and improve production efficiency.

[0033] Optionally, the rolling mill entrance equipment 21 includes a first deflection correction roller 211, a tension roller 212 and a second deflection correction roller 213. The first deflection correction roller 211 is connected to the combined looper 3, and the second deflection correction roller 213 is connected to the continuous rolling mill 22. The first deflection correction roller 211 and the second deflection correction roller 213 are arranged perpendicular to the ground and the first deflection correction roller 211 and the second deflection correction roller 213 are below the ground plane. The tension roller 212 is connected between the first deflection correction roller 211 and the second deflection correction roller, and the tension roller 212 is below the ground plane.

[0034] Specifically, the first deflection correction roller 211 is connected to the joint looper 3, and can correct the deviation of the material coming out of the joint looper 3 in the width direction, ensuring that the material can maintain the correct position before entering the tension roller 212. The tension roller 212 is connected between the first deflection correction roller 211 and the second deflection correction roller 213, and by adjusting the tension of the material during the transmission process, ensures that the material can be smoothly transmitted to the second deflection correction roller 213. The second deflection correction roller 213 further corrects the deviation of the material before entering the continuous rolling mill 22, ensuring that the material can accurately enter the continuous rolling mill 22 for processing.

[0035] In this optional embodiment, the first deviation correction roller 211 and the second deviation correction roller 213 are arranged perpendicular to the ground and below the ground plane, which helps to use gravity to help the material remain stable, reduce tension fluctuations caused by material deflection, make full use of vertical space, and effectively shorten the length of the entire unit. The tension roller 212 is also below the ground plane, which helps to maintain the stability of the material during transmission and reduce deformation or breakage of the material caused by excessive or insufficient tension.

[0036] Optionally, a traffic passage is provided on the ground above the rolling mill entrance equipment 21 .

[0037] Specifically, during the production process, when materials need to be hoisted from the ground or other locations to the mill entrance device 21, the hoisting equipment can be conveniently used to operate through the driving channel. Similarly, when the processed materials need to be hoisted from the mill entrance device 21 to a designated location, they can also be quickly and safely transported through the driving channel.

[0038] In this optional embodiment, by setting a driving passage above the mill entrance device 21, it is convenient to use lifting equipment to lift materials from the ground or other locations to the mill entrance device 21, or to lift processed materials from the mill entrance device 21 to a designated location, which greatly improves the efficiency of material handling, reduces the labor intensity of manual handling, and makes the material transmission between the mill entrance device 21 and upstream and downstream equipment smoother, which helps to optimize the entire production process. At the same time, it also provides convenience for emergency material handling or equipment maintenance during the production process.

[0039] Optionally, the continuous rolling mill 22 includes a plurality of connected rolling mill assemblies, and the spacing between the rolling mill assemblies is L1, where L1≤4500 mm.

[0040] Specifically, the continuous rolling mill 22 in this embodiment includes six groups of rolling mill components connected in sequence, each group of rolling mill components includes a rolling mill, inter-frame pressure rollers, inter-frame stretching rollers and inter-frame belt threading guides. In this embodiment, by optimizing the structure and arrangement of the inter-frame pressure rollers, inter-frame stretching rollers and belt threading guides, the spacing between the rolling mill components is controlled within 4500mm (compressed by 500mm compared to the traditional frame spacing of 5000mm), and the length of the entire rolling mill section is shortened by 2-3m.

[0041] In this optional embodiment, by optimizing the structure and arrangement of the inter-frame pressure rollers, inter-frame tensioning rollers and belt threading guide plates, the spacing between the rolling mill components is controlled within 4500mm (compressed by 500mm compared to the traditional frame spacing of 5000mm), effectively shortening the length of the entire unit.

[0042] Optionally, the composite flying shear 23 includes a pre-shearing feed roller, a flying shear and a post-shearing steering roller that are integrally arranged.

[0043] Specifically, the pre-shear feed roller serves as the input end of the steel plate. By adjusting its rotation speed and pressure, it can ensure that the steel plate can move forward at a stable speed and tension before entering the flying shear, providing good input conditions for the subsequent shearing process, which helps to improve the shearing accuracy and product quality. The flying shear can accurately complete the shearing process during the movement of the steel plate through the combination of blades that open and close quickly. The shearing speed and shearing position of the flying shear can be adjusted according to production needs to achieve precise shearing effects. The post-shear steering roller serves as the output end of the steel plate. By guiding the sheared metal material to leave the flying shear area and change its direction of travel, it ensures that the metal material can smoothly transition to the subsequent production process, which helps to avoid problems such as distortion, deformation or jamming of the metal material after shearing, and further improves product quality and production efficiency.

[0044] In this optional embodiment, by adopting a composite flying shear 23 which is an integrated arrangement of a pre-shearing feed roller, a flying shear, and a post-shearing steering roller, the compact arrangement helps to shorten the length of the rolling mill section.

[0045] Optionally, the coiler 24 is a turntable coiler.

[0046] Specifically, a turntable coiler usually includes a large rotatable turntable on which two or more self-rotating reels are installed for coiling the rolled strip. In order to meet the requirements of fully continuous production, the two reels can be alternately in working state through the rotation of the large turntable. When one reel is coiling the strip, the other reel is on standby, ready to take over the work of the previous reel. When the strip of the first reel is coiled, the large turntable will rotate to put the other reel into working state, while the previous reel can be changed or maintained. The double reels of the turntable coiler work alternately, so that the equipment can maintain high continuity and stability when coiling the strip, reduce the downtime caused by changing coils, and thus improve production efficiency.

[0047] In this optional embodiment, the turntable winder allows two or more reels to work alternately, thereby reducing the time for reel changing and downtime and improving the overall production efficiency.

[0048] Optionally, the distance between the rolling mill assembly close to the composite flying shear 23 and the coil unloading position of the coiler 24 is L2, and L2≤9000mm.

[0049] Specifically, in this embodiment, the composite flying shear 23 and the coiler 24 are connected by a magnetic belt, and the distance between the rolling mill assembly close to the composite flying shear 23 and the coil unloading position of the coiler 24 is controlled within 9000 mm.

[0050] In this optional embodiment, the outlet of the rolling mill section equipment 2 adopts a composite flying shear 23 (an integrated design of feed rollers before shearing, flying shears, and steering rollers after shearing) and a short-distance magnetic belt threading and winding technology, so that the distance between the rolling mill assembly close to the side of the composite flying shear 23 and the unloading position of the coiler 24 is controlled within 9000mm, thereby shortening the length between the outlet equipment of the traditional rolling mill section equipment 2.

[0051] Optionally, the length of the pickling mill in the horizontal direction is L3, and L3≤2000m.

[0052] Specifically, the horizontal length of the pickling mill, that is, the maximum dimension of the pickling mill along the length direction of its three-row structure, is controlled within 200m in the total length of the pickling mill with a compact arrangement, which is 1 / 3 shorter than that of the traditional pickling mill.

[0053] In this optional embodiment, by shortening the length of the pickling mill, it can be made more compact and energy-efficient while maintaining efficient processing capacity. A shorter mill length means less acid consumption and lower energy consumption, and is also easier to maintain and operate. In industrial sites such as steel mills, land and space resources are usually very valuable. Shortening the length of the pickling mill helps save floor space, improve land utilization, and reduce production costs.

[0054] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A pickling mill, characterized in that: include: A pickling section equipment (1) and a rolling mill section equipment (2), wherein the pickling section equipment (1) comprises a pickling inlet equipment (11), a welding machine (12), a pickling inlet looper (13), a straightening machine (14), a pickling process section (15) and a rinsing section (16) which are connected in sequence, and the rolling mill section equipment (2) comprises a rolling mill inlet equipment (21), a continuous rolling mill (22), a composite flying shear (23) and a coiler (24) which are connected in sequence, the pickling section equipment (1) and the rolling mill section equipment (2) are connected via a joint looper (3), and the pickling section equipment (1) is arranged in three rows in parallel. The three rows are arranged in a vertical direction to the ground plane, the pickling entrance equipment (11) and the welding machine (12) are arranged in the second row, the pickling entrance looper (13) is arranged in the first row, the straightening machine (14), the pickling process section (15) and the rinsing section (16) are arranged in the third row, the combined looper (3) is aligned with the second row and connects the rinsing section (16) and the rolling mill entrance equipment (21), the rolling mill entrance equipment (21) is arranged below the ground plane, and the continuous rolling mill (22), the composite flying shear (23) and the coiler (24) are arranged on the ground.

2. The pickling mill according to claim 1, characterized in that: The pickling inlet device (11) and the welding machine (12) are arranged on the side of the pickling process section (15) close to the straightening machine (14), and the combined looper (3) is arranged in a stacked manner and is located between the second row and the third row of the pickling section equipment (1) and on the side of the pickling process section (15) close to the rinsing section (16).

3. The pickling mill according to claim 2, characterized in that: The combined looper (3) is arranged in six layers.

4. The pickling mill according to claim 1, characterized in that: The rolling mill entrance device (21) comprises a first deflection correction roller (211), a tension roller (212) and a second deflection correction roller (213); the first deflection correction roller (211) is connected to the combined looper (3); the second deflection correction roller (213) is connected to the continuous rolling mill (22); the first deflection correction roller (211) and the second deflection correction roller (213) are arranged perpendicular to the ground and the first deflection correction roller (211) and the second deflection correction roller (213) are below the ground plane; the tension roller (212) is connected between the first deflection correction roller (211) and the second deflection correction roller, and the tension roller (212) is below the ground plane.

5. The pickling mill according to claim 4, characterized in that: A vehicle passage is provided on the ground above the rolling mill entrance equipment (21).

6. The pickling mill according to claim 1, characterized in that: The continuous rolling mill (22) comprises a plurality of connected rolling mill components, the spacing between the rolling mill components is L1, and L1≤4500mm.

7. The pickling mill according to claim 6, characterized in that: The composite flying shear (23) comprises a pre-shearing feed roller, a flying shear and a post-shearing steering roller which are integrally arranged.

8. The pickling mill according to claim 6, characterized in that: The coiler (24) is a turntable coiler.

9. The pickling mill according to claim 8, characterized in that: The distance between the rolling mill assembly on one side close to the composite flying shear (23) and the coil unloading position of the coiler (24) is L2, and L2≤9000mm.

10. The pickling mill according to claim 1, characterized in that: The length of the acid rolling mill group in the horizontal direction is L3, and L3≤2000m.

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