阅读说明：本技术 一种窄带钢简配酸连轧生产轧硬卷工艺方法 (Technological method for producing hard-rolled coil by simply and continuously rolling narrow band steel with acid ) 是由 田镇 于 2018-08-04 设计创作，主要内容包括：本发明公开了一种窄带钢简配酸连轧生产轧硬卷工艺方法,包括上卷小车、开卷机、焊机、入口盘式活套、矫直机、工艺段、轧机、卷取机和卸卷小车,所述上卷小车的下道工序设有所述开卷机,所述开卷机的下道工序设有所述焊机,所述焊机的下道工序设有所述入口盘式活套,所述入口盘式活套的下道工序设有所述矫直机；一种窄带钢简配酸连轧生产轧硬卷工艺方法,它将酸洗和轧机整合成一条生产线,去掉中间产品存储转运环节,带钢酸洗后直接进入轧机连续轧制生产,应用本发明可缩产品前置期,降低中间产品库存量,降低流动资金需求,减少生产操作人员,降低运输成本、提高生产效率、产品成材率和质量。(The invention discloses a narrow band steel simple acid-mixed continuous rolling production hard-rolled coil process method, which comprises an upper coil trolley, an uncoiler, a welding machine, an inlet disc type loop, a straightening machine, a process section, a rolling machine, a coiling machine and an uncoiling trolley, wherein the lower process of the upper coil trolley is provided with the uncoiler, the lower process of the uncoiler is provided with the welding machine, the lower process of the welding machine is provided with the inlet disc type loop, and the lower process of the inlet disc type loop is provided with the straightening machine; a process for producing hard rolled coil from narrow band steel by acid-mixing and continuous rolling features that pickling and rolling mill are integrated into a production line, the storage and transfer links of intermediate products are eliminated, and the pickled band steel is directly rolled in rolling mill.)

1. A process method for producing hard coils by continuous rolling of narrow band steel with simple acid is characterized by comprising the following steps: the production line comprises an upper coiling trolley (1), an uncoiling machine (2), a welding machine (3), an inlet disc type loop (4), a straightening machine (5), a process section (6), a rolling mill (7), a coiling machine (8) and an uncoiling trolley (9), wherein the lower process of the upper coiling trolley (1) is provided with the uncoiling machine (2), the lower process of the uncoiling machine (2) is provided with the welding machine (3), the lower process of the welding machine (3) is provided with the inlet disc type loop (4), the lower process of the inlet disc type loop (4) is provided with the straightening machine (5), the lower process of the straightening machine (5) is provided with the process section (6), internal processes of the process section (6) are respectively a pre-cleaning section (61), an acid-washing process section (62), a five-level rinsing section (63), a side sweeping and blowing section (64) and a hot air drying section (65), and the pre-cleaning section (61), The working procedures among the pickling process section (62), the five-level rinsing section (63) and the hot air drying section (65) are sequentially carried out, the rolling mill (7) is arranged at the next working procedure of the process section (6), the coiling machine (8) is arranged at the next working procedure of the rolling mill (7), and the coil unloading trolley (9) is arranged at the next working procedure of the coiling machine (8).

2. The process method for producing the hard-rolled coil from the narrow band steel by simple acid continuous rolling according to claim 1, is characterized in that: the uncoiler (2) is a double-channel uncoiler, and the welding machine (3) adopted in the next process of the uncoiler (2) is a domestic welding machine.

3. The process method for producing the hard-rolled coil from the narrow band steel by simple acid continuous rolling according to claim 1, is characterized in that: the inlet disc type loop (4) is also called as a disc type storage bin, the fastest actual punching speed of the disc type loop can reach 350m/min, and the punching speed can be stabilized at 290m/min by considering the speed increasing and decreasing factors; for the current narrow strip hot rolled coil with the unit coil weight of 10kg/mm, the coil punching can be completed within 1.47 minutes when the length of the single coil is 426 meters and the plate thickness is 3mm, and the uncoiling period is 3.97 minutes within 2.5 minutes.

4. The process method for producing the hard-rolled coil from the narrow band steel by simple acid continuous rolling according to claim 3, is characterized in that: on the basis of the support of the sleeve punching speed of the inlet disc type loop (4), theoretically, the production speed of the process section (6) can reach 107m/min, the length of an acid tank is designed according to the maximum process speed of 120m/min, the straightening machine (5) is arranged at the joint of the inlet disc type loop (4) and the process section (6), and a tension roller and a deviation correcting device are arranged at the outlet of the hot air drying section (65).

5. The process method for producing the hard-rolled coil from the narrow band steel by simple acid continuous rolling according to claim 1, is characterized in that: the rolling mill (7) is a continuous rolling unit and comprises a four-high rolling mill (71) and an HC rolling mill (72), the processes between the four-high rolling mill (71) and the HC rolling mill (72) are sequentially carried out, a roller in the four-high rolling mill (71) is a curved roller, a middle roller and a positive bending roller are arranged in the HC rolling mill (72), a plate roller is arranged at the outlet of the HC rolling mill (72), and the rolling mill (7) consisting of the four-high rolling mill (71) and the HC rolling mill (72) is designed in a totally enclosed mode.

6. The process method for producing the hard-rolled coil from the narrow band steel by simple acid continuous rolling according to claim 1, is characterized in that: and a flying shear, a walking beam, a semi-automatic bundling machine and a weighing device are arranged at an outlet of the HC rolling mill (72) and are used for accommodating finished products together with the coiling machine (8).

Technical Field

The invention belongs to the technical field of hard coil rolling production by simple acid continuous rolling of narrow band steel, and particularly relates to a process method for hard coil rolling production by simple acid continuous rolling of narrow band steel.

Background

In cold rolling of medium-width strips and coils, a high-mix acid continuous rolling production process is adopted, and the process is approximately as follows: the hot-rolled steel coil is uncoiled through a double-channel double-uncoiling No. 1 and No. 2 uncoiling machine, the unqualified part of the head of the strip steel is cut off from an inlet after the steel coil is uncoiled, the steel coil is conveyed to a welding machine through a pinch roll and is welded with the tail part of the prepared previous strip steel, the welded strip steel passes through an inlet horizontal loop, the highest sleeve punching speed can reach 600m/min, the strip steel enters a pulling and straightening phosphorus breaking machine in front of a pickling tank, the strip steel enters the pickling tank after being descaled and improved in shape to remove the surface oxidized iron sheet of the strip steel, the pickled strip steel is rinsed and conveyed into a hot air drier for drying, the strip steel then runs to a disc shear through an acid cleaning outlet loop, the strip steel is trimmed or not trimmed according to the production requirement, finally the strip steel enters a cold continuous rolling machine through an online loop, the strip steel entering the cold continuous rolling machine is rolled to the required finished product thickness according to, when the coil weight or the length of the strip steel reaches a specified value, the coil is split by flying shears at the outlet of the rolling mill, the split coil is unloaded by a coil unloading trolley and is sent to an outlet walking beam, the coil is weighed, bundled and labeled on the walking beam, and then the coil is transported to a specified storage area by a crane for storage; the coil acid continuous rolling unit is characterized in that the single weight of a hot-rolled coil is 15-18kg/mm, the length of a single coil of a steel coil with the thickness of 3mm is 637-764 meters, the fastest sleeve punching speed of a horizontal loop can reach 600m/min, the speed increasing and decreasing factors are considered, the sleeve punching is completed in 1.274 minutes for the steel coil with the average length of 500m/min and the 637 meters, the head-tail welding period is 2.5 minutes, and the uncoiling welding rhythm time of the coil is 3.37 minutes; the process speed of 190m/min can be met, the hot rolled coil has a large single weight and a small thickness, the length of the single coil is longer, and the process speed of 230m/min can be met at the fastest speed, so that the high-efficiency production requirement can be met just because the hot rolled edge is curled and the single coil has a heavy weight, the manufacturing difficulty and the cost are greatly increased, but the high-speed requirement of the pickling process speed is also met, and the high-speed production requirement of 1300-1500m/min of a continuous rolling machine can also be met, for the high-efficiency equipment, more than 3000 million welding machines are configured, the product is competitive, the manufacturing cost of one curled acid continuous rolling equipment is more than 2-3 hundred million yuan, and the curled acid continuous rolling equipment cannot be born by general enterprises; with the gradual maturity of the manufacturing technology of domestic cold rolling equipment, the horizontal loop high-acid-mixing continuous rolling technology is applied to the civil enterprises in recent years and expands the field of medium-wide bands, but no one attempts to perform acid continuous rolling in the field of narrow strip steel to date.

The single weight of the narrow strip steel hot-rolled coil is only 10kg/mm, the steel coil is small, the length of the single coil of the steel strip with the thickness of 3mm is only 300 meters, and even if the sleeve punching speed reaches 500 meters, the sleeve punching of 1 coil is completed in 0.64 minute, and the welding time is 2.5 minutes, the uncoiling welding rhythm time of one coil of steel is 3.14 minutes, the production speed of the process section of 100m/min can be realized, moreover, the narrow strip steel version is poor, and the overturning and kinking accidents are easy to occur in the high-speed sleeve punching process of a bedroom loop; three horizontal loops of a plate rolling acid continuous rolling unit basically belong to standard matching, narrow strip steel does not have a successful precedent of the application of the horizontal loops, the fastest speed can be stably achieved, the method is not required to be searched and discussed, the horizontal loops are high in manufacturing cost, if the horizontal loops are applied to a production line with low production efficiency, a manufacturer is not willing to take an adventure attempt, so that no one attempts acid continuous rolling at the present narrow strip steel exist, if the horizontal loops are used as the acid continuous rolling unit, a welding seam must pass through a rolling mill under the condition of normal pressure, the condition that the welding seam passes through the rolling mill at a higher speed without a belt breaking accident must be ensured, a good welding machine is required, the price of a single welding machine in the past is more than 3000 million yuan RMB, the idea that expensive equipment is not arranged on the narrow strip steel production line at all, the narrow strip steel acid continuous rolling is designed according to the thought of the plate rolling acid continuous rolling, the cost of the equipment is about 1, and the, the installation cost is 500 million, the total investment is 2 million yuan in addition to a factory building and matched public and auxiliary equipment, the annual capacity can only reach 40 million tons, so many designers have the idea that the idea is disappointed and do not make further thought any more, and the existing narrow-band steel iron oxide removal sheet has a hydrochloric acid deep-groove pickling semi-continuous method, a strip steel washing rust removal method, a hydrochloric acid shallow-groove turbulent flow semi-continuous method and the like; the method is characterized in that the strip steel is pressed into acid liquor by a sink roll in the hydrochloric acid deep tank pickling process, the pickling process is not circulated, the strip steel is heated by a capillary tube in the tank, the strip steel is neutralized by caustic soda after the pickling process, then is passivated by sodium nitrite and then is dried, the surface of a pickled plate is serious and unclean, the efficiency is low, the general process speed is 60-80m/min, the production cost is high, the quality of the washing rust removal technology is worst, the equipment failure rate is high, and the process production speed is 20-30m/min, and the method is only applied in regions where the pickling process is not allowed; the hydrochloric acid shallow slot turbulent flow acid cleaning is the main technique of the acid cleaning and rust removing, the product quality is high, the technique is mature, the failure rate is low, the production efficiency is high, the cost is low, the narrow band steel hydrochloric acid shallow slot turbulent flow acid cleaning technique, the link restricting the productivity is not in the process section, at the entrance, the head and the tail welding at present adopts the manual welding, the head and the tail lap welding of the common welding machine is adopted, argon arc welding butt welding is not used, the butt end and the butt end are not used, the welding efficiency is higher than argon arc butt welding, the practical production experiment contrast, the lap welding productivity is improved by 20-30 percent than the butt welding, although the service life of the rubber drying roll is shortened, the cost can be reduced by improving the efficiency, the lap welding is basically adopted for the narrow band steel acid cleaning, the manufacturing cost is greatly reduced along with the increasing maturity of the domestic cold rolling equipment, especially the rapid progress of the, the performance of the domestic laser welding machine is directly approaching or exceeding that of the imported flash butt welding machine, the price is only one fourth of that of the imported welding machine, in addition, the domestic pull-up straightening machine and the manufacturing technology of the rolling mill are improved, the efficient thought of acid continuous rolling is introduced into the production field of narrow strip steel, innovation is also carried out, the manufacturing cost is greatly reduced, the process method for producing hard rolls by simply matching acid continuous rolling of narrow strip steel is completely feasible,

disclosure of Invention

The invention aims to provide a process method for producing hard rolls by continuous rolling of narrow strip steel with simple acid, which aims to solve the problems of low production efficiency and low product yield of narrow strip steel caused by high manufacturing cost, unchanged pickling, inconvenient storage and transportation of intermediate products due to separate operation of pickling and rolling mills in the prior art.

In order to achieve the purpose, the invention provides the following technical scheme: a narrow band steel simple acid-mixing continuous rolling production hard-rolled coil process method comprises an upper coil trolley, an uncoiler, a welding machine, an inlet disc type loop, a straightening machine, a process section, a rolling mill, a coiling machine and an uncoiling trolley, wherein the uncoiler is arranged at the next process of the upper coil trolley, the welding machine is arranged at the next process of the uncoiler, the inlet disc type loop is arranged at the next process of the welding machine, the straightening machine is arranged at the next process of the inlet disc type loop, the process section is arranged at the next process of the straightening machine, the internal processes of the process section are respectively a pre-cleaning section, an acid cleaning process section, a five-level rinsing section, an edge sweeping and blowing section and a hot air drying section, the processes among the pre-cleaning section, the acid cleaning process section, the five-level rinsing section and the hot air drying section are sequentially carried out, and the rolling mill is arranged at the next process of the process section, the coiling machine is arranged at the next procedure of the rolling mill, and the coil stripping trolley is arranged at the next procedure of the coiling machine.

Preferably, the uncoiler is a double-channel uncoiler, and the welding machine adopted in the next process of the uncoiler is a domestic welding machine.

Preferably, the inlet disc type loop is also called as a disc type storage bin, the fastest actual punching speed of the disc type loop can reach 350m/min, and the punching speed can be stabilized at 290m/min by considering the speed increasing and decreasing factors; for the current narrow strip hot rolled coil with the unit coil weight of 10kg/mm, the coil punching can be completed within 1.47 minutes when the length of the single coil is 426 meters and the plate thickness is 3mm, and the uncoiling period is 3.97 minutes within 2.5 minutes.

Based on the punching speed support of the inlet disc type loop, theoretically, the production speed of the process section can reach 107m/min, the length of an acid tank is designed according to the maximum process speed of 120m/min, the straightening machine is arranged at the joint of the inlet disc type loop and the process section, and a tension roller and a deviation correcting device are arranged at the outlet of the hot air drying section.

Preferably, the rolling mill is a continuous rolling mill group and comprises a four-high rolling mill and an HC rolling mill, the processes between the four-high rolling mill and the HC rolling mill are sequentially performed, a roller inside the four-high rolling mill is a curved roller, a middle roller and a positive bending roller are arranged inside the HC rolling mill, a plate roller is arranged at an outlet of the HC rolling mill, and the rolling mill consisting of the four-high rolling mill and the HC rolling mill is designed in a fully-closed manner.

Preferably, the outlet of the HC rolling mill is provided with a flying shear, a walking beam, a semi-automatic bundling machine and a weighing device, and the finished product is stored in the coiling machine.

Compared with the prior art, the invention has the beneficial effects that: a process for producing hard rolled coil from narrow band steel by acid-mixing and continuous rolling features that pickling and rolling mill are integrated into a production line, the storage and transfer links of intermediate products are eliminated, and the pickled band steel is directly rolled in rolling mill.

Drawings

FIG. 1 is a schematic flow diagram of the present invention;

FIG. 2 is a schematic flow diagram of a process section of the present invention;

FIG. 3 is a schematic flow diagram of the rolling mill train of the present invention;

in the figure: 1. a reeling trolley; 2. an uncoiler; 3. a welding machine; 4. an inlet disc type loop; 5. a straightening machine; 6. a process section; 61. a pre-cleaning section; 62. acid washing process section; 63. a fifth-stage rinsing section; 64. an edge sweeping and blowing section; 65. a hot air drying section; 7. a rolling mill; 71. a four high mill; 72. HC rolling mill; 8. a coiler; 9. coil stripping trolley.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-3, the present invention provides a technical solution: a narrow band steel simple acid-mixing continuous rolling production hard-rolled coil process method comprises an upper coil trolley 1, an uncoiler 2, a welding machine 3, an inlet disc type loop 4, a straightening machine 5, a process section 6, a rolling machine 7, a coiling machine 8 and an uncoiling trolley 9, wherein the lower process of the upper coil trolley 1 is provided with the uncoiler 2, the lower process of the uncoiler 2 is provided with the welding machine 3, the lower process of the welding machine 3 is provided with the inlet disc type loop 4, the lower process of the inlet disc type loop 4 is provided with the straightening machine 5, the lower process of the straightening machine 5 is provided with the process section 6, the internal processes of the process section 6 are respectively a pre-cleaning section 61, an acid cleaning process section 62, a five-level rinsing section 63, an edge sweeping section 64 and a hot air drying section 65, the processes among the pre-cleaning section 61, the acid cleaning process section 62, the five-level rinsing section 63 and the hot air drying section 65 are sequentially carried out, the lower process of the, the next process of the rolling mill 7 is provided with a coiling machine 8, and the next process of the coiling machine 8 is provided with a coil stripping trolley 9.

In the embodiment, the technological process of the acid continuous rolling production line is coiling trolley 1 → uncoiler 2 → welder 3 → inlet disk loop 4 → straightener 5 → process segment 6 → rolling mill 7 → coiler 8 → unloading trolley 9.

In the embodiment, a strip steel raw material is fed to an uncoiler 2 through an upper coiling trolley 1, the strip steel raw material is uncoiled through the uncoiler 2, a hot-rolled coil is connected end to end through a welding machine 3 for welding, the welding machine 3 can roll a welding seam at a high speed through a rolling machine 7, high-efficiency production efficiency is guaranteed, the strip steel enters an inlet disc type loop 4 after welding is completed, the inlet disc type loop 4 guarantees that the stored strip steel can guarantee constant-speed production of a process section when the strip steel is subjected to end welding operation, the strip steel enters a straightening machine 5 through the inlet disc type loop 4, the straightening machine 5 plays a role in straightening strip steel, breaking iron scales and accelerating production efficiency, the treated strip steel enters the process section 6 to be subjected to acid pickling, post-treatment and drying sequentially through a pre-cleaning section 61, an acid pickling process section 62, a five-stage rinsing section 63, an edge sweeping and blowing section 64 and a hot air drying section 65, the dried, entering a rolling mill 7, selecting the type of a rolling mill 7 unit according to product specifications, wherein the rolling mill 7 can be a three-roller, four-roller or five-roller continuous rolling mill unit, the rolling mill unit comprises a finished product rack of a plate type HC rolling mill 72, other rolling mills adopt a four-roller rolling mill 71, a curved surface roller is pre-ground through a numerical control grinding machine, the plate type is roughly controlled, the finished product unit keeps good roll bending effect, a plate type roller is arranged at the outlet of the rolling mill, plate type closed-loop control is realized, the basic plate type of the strip steel is ensured to be good, the formed strip steel is coiled through a coiling machine 8, and the strip steel is unloaded through.

Further, the uncoiler 2 is a double-channel uncoiler, and the welding machine 3 adopted in the next process of the uncoiler 2 is a domestic welding machine.

In this embodiment, decoiler 2 is the binary channels decoiler, can realize multichannel production, and the domestic welding machine that welding machine 3 adopted simultaneously has the price advantage, and is close with the performance of import welding machine, can shorten welding time in a large number, and the cooperation binary channels decoiler is opened a book rhythm time and probably is shortened 4-5 minutes, and laser welding seam is of high quality, can roll the welding seam at a high speed 200m/min, and can not harm the roll, and is less to equipment damage.

Further, the inlet disc type loop 4 is also called as a disc type storage bin, the fastest actual punching speed of the disc type loop can reach 350m/min, and the punching speed can be stabilized at 290m/min by considering the speed increasing and decreasing factors; for the current narrow strip hot rolled coil with the unit coil weight of 10kg/mm, the coil punching can be completed within 1.47 minutes when the length of the single coil is 426 meters and the plate thickness is 3mm, and the uncoiling period is 3.97 minutes within 2.5 minutes.

In the embodiment, the inlet disc type loop 4 replaces the original inlet horizontal loop, the inlet horizontal loop has the advantage of high efficiency, but has the defects of complex manufacturing, installation and maintenance and high price, and is not suitable for a narrow strip steel production line, the inlet disc type loop 4 has the advantages of large storage capacity, small occupied area and investment saving, iron oxide sheets are arranged on the surface of a hot rolled steel strip before acid cleaning, the surface of the strip steel cannot be scratched, the sleeve punching speed of the inlet disc type loop 4 can be increased to the maximum, the unit capacity is fully exerted, the purposes of low investment, high output and excellent surface quality are achieved.

Further, based on the support of the sleeve punching speed of the inlet disc type loop 4, the production speed of the process section 6 can reach 107m/min theoretically, the length of the acid tank is designed according to the maximum process speed of 120m/min, the straightening machine 5 is arranged at the joint of the inlet disc type loop 4 and the process section 6, and a tension roller and a deviation correcting device are arranged at the outlet of the hot air drying section 65.

In the embodiment, the inlet of the pickling process section 62 is provided with a straightener 5 which can play a certain role in improving plate shape, and can crush iron scales on the surface of strip steel and accelerate pickling speed, and the process section 6 is a shallow slot turbulent pickling process and comprises a pre-cleaning section 61, a pickling process section 62, a five-stage rinsing section 63, an edge sweeping and blowing section 64 and a hot air drying section 65, wherein the pre-cleaning section 61 collects all rinsing wastewater for pre-cleaning, the rinsing wastewater is fully utilized for preheating, the pickling process section 62 is a shallow slot turbulent process, the pickling quality and efficiency can be improved, and acid liquor in an acid tank can be discharged when roll replacement or failure and downtime is long; and the five-stage rinsing section 63 is used for improving the utilization rate of the desalted water and the distilled water, the edge sweeping and blowing section 64 is used for sweeping the narrow steel strip, and the hot air drying section 65 is used for drying residual pickling solution on the narrow steel strip, so that the subsequent processing of the narrow steel strip is facilitated.

Further, the rolling mill 7 is a continuous rolling mill group, and comprises a four-high rolling mill 71 and an HC rolling mill 72, the processes between the four-high rolling mill 71 and the HC rolling mill 72 are sequentially performed, a roller inside the four-high rolling mill 71 is a curved roller, a middle roller and a positive bending roller are arranged inside the HC rolling mill 72, a plate roller is arranged at an outlet of the HC rolling mill 72, and the rolling mill 7 consisting of the four-high rolling mill 71 and the HC rolling mill 72 is designed in a totally enclosed manner.

In this embodiment, the rolling mill 7 is a full hydraulic cold continuous rolling mill group, in order to reduce investment, the pre-rolling stand is a four-high rolling mill 71, the working rolls are pre-ground by a numerical control grinding machine to symmetrical positive camber curved rolls, and the plate shape is roughly adjusted; the forming machine frame is an HC rolling mill 72, the rolling rolls are cylindrical rolls and flat roll bodies, the HC rolling mill 72 is formed by a working roll positive bending roll and a plate shape instrument and is simply matched with plate shape closed loop control, basic double-side waves, single-side waves and middle waves of a narrow steel strip are eliminated, emulsion is not added for fine cooling, wave shapes are caused by transverse uneven extension, the plate shape rolls are large in extension, pressure acting on the rolling rolls is small, extension is small, pressure acting on the rolling rolls is large, and plate shape summarization can be judged.

Further, a flying shear, a walking beam, a semi-automatic bundling machine and a weighing device are arranged at the outlet of the HC rolling mill 72, and the finished product is stored in the coiling machine 8.

In this embodiment, flying shears, walking beams, a semi-automatic bundling machine and a weighing device are arranged at the outlet of the HC rolling mill 72, the formed narrow steel strip is processed in sequence, and the material is collected by the coiling machine 8, wherein the rolling mill main transmission system adopts an ac-dc-ac medium-voltage transmission system, and the rolling mill has the advantages of high power factor, fast speed response, fast current response, high speed control precision, less harmonic waves, high efficiency, energy conservation, consumption reduction and the like.

The working principle and the using process of the invention are as follows: after the device is installed, a strip steel raw material is fed to an uncoiler 2 through an upper coiling trolley 1, the strip steel raw material is uncoiled through the uncoiler 2, a hot-rolled coil head and a hot-rolled coil tail are connected through a welding machine 3 for welding, the welding machine 3 can roll a welding seam at a high speed to pass through a rolling mill 7, high-efficiency production efficiency is guaranteed, the strip steel enters an inlet disc type loop 4 after welding is completed, the stored strip steel can guarantee constant-speed production of a process section when the strip steel is subjected to head and tail welding operation through the inlet disc type loop 4, the strip steel enters a straightening machine 5 through the inlet disc type loop 4, the straightening machine 5 has the functions of straightening the strip steel, crushing iron scale and accelerating production efficiency, the treated strip steel enters the process section 6 to sequentially pass through a pre-cleaning section 61, an acid cleaning process section 62, a five-stage rinsing section 63, an edge sweeping and blowing section 64 and a hot air drying section 65 for acid cleaning, post-treatment and, entering a rolling mill 7, selecting the type of a rolling mill 7 unit according to product specifications, wherein the rolling mill 7 can be a three-roller, four-roller or five-roller continuous rolling mill unit, the rolling mill unit comprises a finished product rack of a plate type HC rolling mill 72, other rolling mills adopt a four-roller rolling mill 71, a curved surface roller is pre-ground through a numerical control grinding machine, the plate type is roughly controlled, the finished product unit keeps good roll bending effect, a plate type roller is arranged at the outlet of the rolling mill, plate type closed-loop control is realized, the basic plate type of the strip steel is ensured to be good, the formed strip steel is coiled through a coiling machine 8, and the strip steel is unloaded through.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.