阅读说明：本技术 一种宽带薄板不锈钢轧钢设备及其热轧工艺 (Wide-band thin-plate stainless steel rolling equipment and hot rolling process thereof ) 是由 刘龙祥 秦永波 付洪刚 李景 于 2019-10-11 设计创作，主要内容包括：本发明公开了一种宽带薄板不锈钢轧钢设备及其热轧工艺,轧钢设备包括粗轧装置、精轧装置以及卷取装置,粗轧装置一侧设有精轧装置,精轧装置一侧设有卷取装置；本发明设有带钢拦截装置,用于收集扎线上的废带钢,可以有效的防止废带钢影响正常的轧制生产工作；在传动箱与推杆装置共同作用下,可以使侧导板同步并对称向轧制中心线靠拢使侧导板靠拢对带钢进行精准对中,防止因对中偏差出现堆钢或者带钢撞击侧导板情况的发生。(The invention discloses a steel rolling device for a broadband sheet stainless steel and a hot rolling process thereof, wherein the steel rolling device comprises a rough rolling device, a finish rolling device and a coiling device, wherein the finish rolling device is arranged on one side of the rough rolling device, and the coiling device is arranged on one side of the finish rolling device; the rolling device is provided with the strip steel intercepting device which is used for collecting waste strip steel on the binding wire, so that the influence of the waste strip steel on normal rolling production can be effectively prevented; under the combined action of the transmission case and the push rod device, the side guide plates can be synchronously and symmetrically closed to the rolling central line to be closed to carry out accurate centering on the strip steel, and the condition that the strip steel is piled or the strip steel impacts the side guide plates due to centering deviation is prevented.)

1. A steel rolling device for broadband sheet stainless steel comprises a rough rolling device, a finish rolling device and a coiling device, wherein the finish rolling device is arranged on one side of the rough rolling device, and the coiling device is arranged on one side of the finish rolling device;

the roughing device is characterized by comprising a roller way I, roller way power I, a transmission shaft I, a side guide plate, a multi-roller seat body, a roller way II, a supporting guide plate, a transmission box I, a push rod device, roller way power II and a transmission shaft II, wherein the transmission shaft I is arranged on one side of the roller way I, the roller way power I is arranged on one side of the transmission shaft I, the transmission shaft II is arranged on the other side of the roller way I, the roller way power II is arranged on one side of the transmission shaft II, the roller way II is arranged between the side guide plates, the multi-roller seat body is arranged on one side of the side guide plate, the transmission box I;

the precision rolling device comprises a guide and guard plate device, a driving block, a middle guide plate, a support, a side guide plate device, a side pulley, a supporting roller and a protective cover, wherein the guide and guard plate device is arranged on one side of the support, the driving block is arranged on one side of the guide and guard plate device, the side guide plate device is arranged on the other side of the upper part of the guide and guard plate device, the side pulley is arranged in the side guide plate device, and the middle guide plate is arranged in the middle of the side guide plate device;

the coiling device comprises a centering device I, a pinch roll I, pinch roll power I, a conveying device, a strip steel intercepting device, a pinch roll II, pinch roll power II, an uncoiling trolley, a coiling machine and an arc-shaped guide plate, wherein the pinch roll I is arranged on one side of the centering device I, the pinch roll power I is arranged on one side of the pinch roll I, the conveying device is arranged on the other side of the pinch roll I, the pinch roll II is arranged on one side of the conveying device, the pinch roll power II is arranged on one side of the pinch roll II, the strip steel intercepting device is arranged on the other side of the pinch roll II, the coiling machine is arranged on one side of the strip steel intercepting device, the arc-shaped guide plate is arranged on one side;

the centering device I comprises an inclined section side guide plate, a parallel section side guide plate, a rotating shaft, an oil cylinder, push rods, a synchronizing shaft and a transmission case II, wherein the parallel section side guide plate is arranged on one side of the inclined section side guide plate, the rotating shaft is arranged between the inclined section side guide plate and the parallel section side guide plate and movably connected with the inclined section side guide plate, the oil cylinder is arranged on one side of the parallel section side guide plate, a group of push rods are arranged on two sides of the oil cylinder, the transmission case II is arranged on one side of each push rod, and the synchronizing;

the strip steel intercepting device comprises a support, a waste hopper, a sliding plate and a base, wherein the support is arranged on one side of the coiling device, the base is arranged on the other side of the support, the waste hopper is arranged on the upper portion of the base, the sliding plate is arranged on one side of the waste hopper, the bottom surface of the waste hopper is directly connected with the support, and the side surface of the waste hopper is directly connected with the sliding plate through the base.

2. The wide strip thin stainless steel rolling mill according to claim 1, wherein said scrap bin is a weldment of "C-shaped" structure.

3. The wide band thin plate stainless steel rolling equipment according to claim 1, wherein steel coil stations are arranged on two sides of the coil stripping trolley.

4. The wide band thin plate stainless steel rolling apparatus according to claim 1, wherein a support roller is provided at one side of the intermediate guide plate.

5. The wide strip stainless steel rolling facility according to claims 1 to 4, wherein a protective cover is provided on the frame of the finish rolling device.

6. A hot rolling process for broadband sheet stainless steel is characterized by comprising the following steps:

1) rough rolling preparation, wherein in the rough rolling process, the opening degree of the side guide plate is set to be 30-50mm wider than the strip steel before the strip steel enters the side guide plate;

2) the strip steel is centered, after the strip steel enters the side guide plates, the roll shafts stop running, and the side guide plates are synchronously and symmetrically closed to the rolling central line to close the side guide plates so as to center the strip steel;

3) rough rolling is carried out, when the strip steel is centered, the side guide plates are quickly opened by 30-50mm, the strip steel starts to run towards a rolling mill, and the rough rolling working process is completed;

4) finishing rough rolling, and opening the side guide plates synchronously and symmetrically rolling the central line after the strip steel passes through the side guide plates to prepare for the next rough rolling work;

5) preparing finish rolling, wherein the strip steel accurately and stably enters a working area in a preset direction and state through a guide plate device in the finish rolling working process;

6) the strip steel is centered, when the head of the strip steel enters the side guide plate device, the side guide plate device drives the inclined section side guide plate to swing around the fixed rotating shaft, and the hydraulic cylinders on the two sides synchronously move so as to realize the centering of the strip steel;

7) finishing finish rolling, and after centering is finished, continuously operating the strip steel to realize the finish rolling working process of the strip steel;

8) the strip steel is bent for the first time, and in the coiling process, when the strip steel enters the pinch roll I, the upper roll quickly presses the strip steel and bends the head of the strip steel for the first time;

9) the strip steel is bent for the second time, and the head of the strip steel enters a pinch roll II under the guidance of an outlet valve and a guide plate to be bent for the second time;

10) coiling preparation, wherein the head of the strip steel reaches the wrapper rolls under the guidance of the arc-shaped guide plate, and the wrapper rolls respectively and rapidly press the strip steel;

11) initial coiling, namely, after the strip steel rotates for 2-3 circles around a reel, the reel quickly tensions the strip steel, and at the moment, no relative motion exists between the strip steel and the reel;

12) preparing to unload coils, and when the coiling of the strip steel is finished, slowly raising the coil unloading trolley at low pressure to drag the steel coils until the coiling is finished;

13) and (4) finishing coiling, and recovering the coiling machine after the coil stripping trolley leaves the coiling machine.

Technical Field

The invention belongs to the technical field of stainless steel casting and rolling integrated production, and particularly relates to a wide-band thin-plate stainless steel rolling device and a hot rolling process thereof.

Background

At present, in the steel rolling industry, a narrow band is defined as a wide band with a wide band less than 1m, a wide band greater than 1m is defined as a wide band, a steel band greater than 0.6m and less than 1.2m is also defined as a medium wide band, and a steel band greater than 1.2m and less than 1.7m is strictly defined as a wide band, especially for a wide band stainless steel composite plate, the steel band is wider, the surface area exposed to air is larger, and the surface quality control of the steel band is more difficult; the stainless steel with the thickness less than or equal to 0.3mm and the thickness as thin as 0.01mm is generally called ultra-thin stainless steel, belongs to the field of stainless steel specialization, and has the market characteristics of small quantity, variety, strict quality requirement, high technical content requirement and high additional value, and the strengthening of the steel can reduce the plate thickness, lighten the structural part and prolong the service life.

The following problems are easy to occur in the existing rolling production process of the wide band sheet: 1) the production of steel scraps can occur in the rolling process, the collection of the steel scraps in time can influence the normal rolling operation, and meanwhile, the danger of punching out the binding wires can occur; 2) the size deviation can occur in the process of strip steel centering, so that the strip steel impacts a side guide plate or steel stacking accidents occur, once the deviation impact occurs, the stainless steel of the broadband sheet is distorted and deformed, and the quality of the stainless steel of the broadband sheet is influenced.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide a wide-band thin-plate stainless steel rolling device and a hot rolling process thereof, wherein a strip steel intercepting device is arranged in the rolling working process to collect waste steel so as to prevent the waste steel from influencing the normal rolling work; under the combined action of the oil cylinder and the push rod, the side guide plates can be synchronously and symmetrically closed to the rolling central line to be closed to carry out accurate centering on the band steel, and the condition that the band steel is piled or the band steel impacts the side guide plates due to centering deviation is prevented.

In order to achieve the purpose, the invention adopts the technical scheme that:

a steel rolling device for a broadband sheet stainless steel comprises a rough rolling device, a finish rolling device and a coiling device, wherein the finish rolling device is arranged on one side of the rough rolling device, the coiling device is arranged on one side of the finish rolling device, a strip steel is rolled by the rough rolling device to a specified size and then enters the finish rolling device, the specified size is rolled again in the finish rolling device, and the strip steel is coiled by the coiling device after the rolling is finished;

the rough rolling device comprises a roller way I, a roller way power I, a transmission shaft I, side guide plates, a multi-roller seat body, a roller way II, supporting guide plates, a transmission box I, a push rod device, a roller way power II and a transmission shaft II, wherein the transmission shaft I is arranged on one side of the roller way I, the roller way power I is arranged on one side of the transmission shaft I, the transmission shaft II is arranged on the other side of the roller way I, the roller way power II is arranged on one side of the transmission shaft II, the roller way II is arranged between the side guide plates, the multi-roller seat body is arranged on one side of the side guide plates, the transmission box I is arranged on one side of the multi-roller seat body, the push rod device is arranged on one side of the transmission box I, the transmission box I and the push rod device are combined to prevent deviation of strip steel centering, the supporting guide plates are arranged on the other side of the roller way II, the strip steel stops running, the push rod device is pushed forwards at the moment, the lower push rod is driven to pull backwards simultaneously under the action of the gear rack in the transmission box I, the side guide plates are enabled to be synchronously and symmetrically close to the rolling central line to enable the side guide plates to close to carry out accurate centering on the strip steel, the situation that the strip steel is piled or the strip steel collides with the side guide plates due to centering deviation is prevented, when the strip steel centering is completed, the side guide plates are rapidly opened for a short distance (30mm-50mm), the strip steel starts to run towards a rolling mill, and after the strip steel passes through, the push rod device enables the side guide plates to be synchronously and symmetrically opened with.

The precision rolling device comprises a guide and guard plate device, a driving block, a middle guide plate, a support, a side guide plate device, a side pulley, a supporting roller and a protective cover, wherein the guide and guard plate device is arranged on one side of the support, the driving block is arranged on one side of the guide and guard plate device, the side guide plate device is arranged on the other side of the upper part of the guide and guard plate device, the side pulley is arranged in the side guide plate device, and the middle guide plate is arranged in the middle of the side guide plate device; the strip steel accurately and stably enters a working area in a set direction and state through the guide plate device, and the strip steel is finish-rolled when the head of the strip steel enters the side guide plate device.

The coiling device comprises a centering device I, a pinch roll I, pinch roll power I, a conveying device, a strip steel intercepting device, a pinch roll II, pinch roll power II, an uncoiling trolley, a coiling machine and an arc-shaped guide plate, wherein the pinch roll I is arranged on one side of the centering device I, the pinch roll power I is arranged on one side of the pinch roll I, the conveying device is arranged on the other side of the pinch roll I, the pinch roll II is arranged on one side of the conveying device, the pinch roll power II is arranged on one side of the pinch roll II, the strip steel intercepting device is arranged on the other side of the pinch roll II, the coiling machine is arranged on one side of the strip steel intercepting device, the arc-shaped guide plate is arranged on one side; when strip steel passes through the centering device I to complete centering work and enters the pinch roll I, the upper roll rapidly presses the strip steel, the head of the strip steel is subjected to primary bending, the head of the strip steel enters the pinch roll II under the guide of the outlet valve and the guide plate to be subjected to secondary bending, the head of the strip steel reaches the winding assisting rolls under the guide of the arc-shaped guide plate, the winding assisting rolls rapidly press the strip steel respectively, the winding drum rapidly tensions the strip steel after the strip steel rotates for 2-3 circles around the winding drum, no relative motion exists between the strip steel and the winding drum at the moment, the coil discharging trolley is slowly lifted at low pressure to drag the coil of steel when the strip steel is rapidly finished to finish the winding, and the winding machine is recovered after the coil discharging trolley leaves the winding machine.

The centering device I comprises an inclined section side guide plate, a parallel section side guide plate, a rotating shaft, an oil cylinder, a push rod, a synchronizing shaft and a transmission case II, one side of the inclined section side guide plate is provided with a parallel section side guide plate, a rotating shaft is arranged between the inclined section side guide plate and the parallel section side guide plate and is movably connected with the inclined section side guide plate, an oil cylinder is arranged on one side of the parallel section side guide plate, a group of push rods are arranged on two sides of the oil cylinder, a transmission case II is arranged on one side of each push rod, a synchronizing shaft is arranged in each transmission case II, when the strip steel enters the centering device I, the oil cylinder provides power to drive the parallel section side guide plates to move, the parallel section side guide plates drive the inclined section side guide plates to move back and forth around the rotating shaft so as to realize the centering working process of the strip steel, meanwhile, the parallel section side guide plate drives the push rods to move synchronously, and the push rods simultaneously drive the synchronizing shafts in the transmission case II to move simultaneously, so that the parallel movement of the parallel section side guide plate is prevented from inclining.

The strip steel intercepting device comprises a support, a waste hopper, a sliding plate and a base, wherein the support is arranged on one side of the coiling device, the base is arranged on the other side of the support, the waste hopper is arranged on the upper part of the base, the sliding plate is arranged on one side of the waste hopper, the bottom surface of the waste hopper is directly connected with the support, and the side surface of the waste hopper is directly connected with the sliding plate through the base, so that the waste hopper can be; the high-speed moving scrap steel directly enters the scrap hopper through the sliding plate, so that the influence of long-time accumulation of the scrap steel on normal coiling work is prevented, and meanwhile, the strip steel which is bent for the second time is finished through the pinch roll II and enters the coiling machine under the guide of the arc-shaped guide plate to perform the coiling work process.

Preferably, the waste hopper is a welding part with a C-shaped structure, and can buffer waste steel moving at high speed, so that a binding line is prevented from being punched out, and safety accidents are prevented.

Preferably, coil of strip stations are arranged on two sides of the coil stripping trolley, and after the coil stripping trolley crane descends to the lowest position, the coil of strip is placed on the coil of strip stations for storing the coil of strip.

Preferably, a support roller is provided at one side of the intermediate guide plate, and the support roller supports the work roller when the rolling of the steel plate is completed, so as to improve the overall rigidity.

Preferably, a protective cover is arranged on a rack in the finish rolling device, and the protective cover can prevent dust generated in the rolling process from entering a rolling mill.

A hot rolling process for broadband sheet stainless steel comprises the following steps:

1) rough rolling preparation, wherein in the rough rolling process, the opening degree of the side guide plate is set to be 30-50mm wider than the strip steel before the strip steel enters the side guide plate;

2) the strip steel is centered, after the strip steel enters the side guide plates, the roll shafts stop running, and the side guide plates are synchronously and symmetrically closed to the rolling central line to close the side guide plates so as to center the strip steel;

3) rough rolling is carried out, when the strip steel is centered, the side guide plates are quickly opened by 30-50mm, the strip steel starts to run towards a rolling mill, and the rough rolling working process is completed;

4) finishing rough rolling, and opening the side guide plates synchronously and symmetrically rolling the central line after the strip steel passes through the side guide plates to prepare for the next rough rolling work;

5) preparing finish rolling, wherein the strip steel accurately and stably enters a working area in a preset direction and state through a guide plate device in the finish rolling working process;

6) the strip steel is centered, when the head of the strip steel enters the side guide plate device, the side guide plate device drives the inclined section side guide plate to swing around the fixed rotating shaft, and the hydraulic cylinders on the two sides synchronously move so as to realize the centering of the strip steel;

7) finishing finish rolling, and after centering is finished, continuously operating the strip steel to realize the finish rolling working process of the strip steel;

8) the strip steel is bent for the first time, and in the coiling process, when the strip steel enters the pinch roll I, the upper roll quickly presses the strip steel and bends the head of the strip steel for the first time;

9) the strip steel is bent for the second time, and the head of the strip steel enters a pinch roll II under the guidance of an outlet valve and a guide plate to be bent for the second time;

10) coiling preparation, wherein the head of the strip steel reaches the wrapper rolls under the guidance of the arc-shaped guide plate, and the wrapper rolls respectively and rapidly press the strip steel;

11) initial coiling, namely, after the strip steel rotates for 2-3 circles around a reel, the reel quickly tensions the strip steel, and at the moment, no relative motion exists between the strip steel and the reel;

12) preparing to unload coils, and when the coiling of the strip steel is finished, slowly raising the coil unloading trolley at low pressure to drag the steel coils until the coiling is finished;

13) and (4) finishing coiling, and recovering the coiling machine after the coil stripping trolley leaves the coiling machine.

Compared with the prior art, the invention has the beneficial effects that:

1) the strip steel intercepting device is arranged and used for collecting waste strip steel on the binding line, so that the waste strip steel can be effectively prevented from being accumulated to influence normal rolling production work, and meanwhile, the waste strip steel is prevented from running out of the binding line to cause danger.

2) Under the combined action of the transmission case II and the push rod device; the side guide plates can be synchronously and symmetrically closed to the rolling central line to enable the side guide plates to close to the strip steel for accurate centering, and the condition that the strip steel is piled or the strip steel impacts the side guide plates due to centering deviation is prevented.

Drawings

FIG. 1 is a top view of a coiling apparatus in a wide strip thin stainless steel rolling mill of the present invention;

FIG. 2 is a front view of a finish rolling device in a wide strip sheet stainless steel rolling equipment according to the present invention;

FIG. 3 is a top view of a roughing device in a wide strip thin stainless steel rolling equipment according to the present invention;

FIG. 4 is a schematic structural diagram of a centering device I in a coiling device of a wide-band thin-plate stainless steel rolling equipment;

FIG. 5 is a schematic structural view of a steel holding device in a crimping device of a wide-band thin-plate stainless steel rolling equipment according to the present invention;

in the figure: 1. a rough rolling device; 11. a roller way I; 12. roller bed power I; 13. a transmission shaft I; 14. a side guide plate; 15. a multi-roller seat body; 16. a roller bed II; 161. roller bed power II; 162. a transmission shaft II; 17. supporting the guide plate; 18. a transmission case I; 19. a push rod device; 2. a finish rolling device; 21. a guide plate device; 22. a drive block; 23. a middle guide plate; 24. a support; 25. a side guide plate device; 26. a side pulley; 27. a support roller; 28. a protective cover; 3. a take-up device; 31. a centering device I; 311. a sloped section side guide; 312. a parallel section side guide plate; 313. a rotating shaft; 314. an oil cylinder; 315. a push rod; 316. a synchronizing shaft; 317. a transmission case II; 32. a pinch roll I; 33. pinch roll power I; 34. a conveying device; 35. a strip steel intercepting device; 351. a support; 352. a waste hopper; 353. a slide plate; 354. a base; 36. a pinch roll II; 37. pinch roll power II; 38. a steel coil station; 39. coil stripping trolley; 40. a coiler; 41. an arc-shaped guide plate.

Detailed Description

For the convenience of understanding of those skilled in the art, the technical solution of the present invention will be further described in detail with reference to fig. 1 to 5.

A steel rolling device for a broadband sheet stainless steel comprises a rough rolling device 1, a finish rolling device 2 and a coiling device 3, wherein the finish rolling device 2 is arranged on one side of the rough rolling device 1, the coiling device 3 is arranged on one side of the finish rolling device 2, a strip steel is rolled by the rough rolling device 1, enters the finish rolling device 2 after being rolled to a specified size, is rolled again in the finish rolling device 2 to a specified size, and enters the coiling device 3 to perform the coiling work of the strip steel after being finished.

The rough rolling device 1 comprises a roller way I11, a roller way power I12, a transmission shaft I13, a side guide plate 14, a multi-roller seat body 15, a roller way II 16, a supporting guide plate 17, a transmission box I18, a push rod device 19, a roller way power II 161 and a transmission shaft II 162, wherein the transmission shaft I13 is arranged on one side of the roller way I11, the roller way power I12 is arranged on one side of the transmission shaft I13, the transmission shaft II 162 is arranged on the other side of the roller way I11, the roller way power II 161 is arranged on one side of the transmission shaft II 162, the roller way II 16 is arranged between the side guide plates 14, the multi-roller seat body 15 is arranged on one side of the side guide plate 14, the transmission box I18 is arranged on one side of the multi-roller seat body 15, the push rod device 19 is arranged on one side of the transmission box I18, the transmission box I18 and the push, the opening degree of the side guide plate 14 is set to be 50mm wider than the strip steel, after the strip steel is provided by the roller way power II 161 and enters the side guide plate 14, the strip steel stops running, at the moment, the push rod device 19 is pushed forwards, the push rod device drives the lower push rod to pull backwards simultaneously under the action of a gear rack in the transmission box I18, so that the side guide plate 14 is synchronously and symmetrically closed towards the rolling central line to accurately center the strip steel, the condition that the strip steel is piled or the strip steel impacts the side guide plate 14 due to centering deviation is prevented, after the strip steel is centered, the side guide plate 14 is rapidly opened by 30mm, the strip steel starts running towards the rolling mill, and after the strip steel passes through, the push rod device enables the side guide plate 14 to be synchronously and symmetrically.

The finish rolling device 2 comprises a guide and guard plate device 21, a driving block 22, a middle guide plate 23, a support 24, a side guide plate device 25, a side sliding wheel 26, a supporting roller 27 and a protective cover 28, wherein the guide and guard plate device 21 is arranged on one side of the support 24, the driving block 22 is arranged on one side of the guide and guard plate device 21, the side guide plate device 25 is arranged on the other side of the upper part of the guide and guard plate device 21, a side pulley 26 is arranged in the side guide plate device 25, and the middle guide plate 23 is arranged in the middle of the side guide plate device 25; the strip steel is accurately and stably fed into the working area through the guide plate device in a predetermined direction and state, and the strip steel is finish rolled when the head of the strip steel is fed into the side guide plate device 25.

The coiling device 3 comprises a centering device I31, a pinch roll I32, pinch roll power I33, a transmission device 34, a strip steel intercepting device 35, a pinch roll II 36, pinch roll power II 37, a coil unloading trolley 39, a coiling machine 40 and an arc-shaped guide plate 41, wherein the pinch roll I32 is arranged on one side of the centering device I31, the pinch roll power I33 is arranged on one side of the pinch roll I32, the transmission device 34 is arranged on the other side of the pinch roll I32, the pinch roll II 36 is arranged on one side of the transmission device 34, the pinch roll power II 37 is arranged on one side of the pinch roll II 36, the strip steel intercepting device 35 is arranged on the other side of the pinch roll II 36, the coiling machine 40 is arranged on one side of the strip steel intercepting device 35, the arc-shaped guide plate 41 is arranged on one side of the coiling; when the strip steel passes through the centering device I31 to complete centering work and enters the pinch roll I32, the upper roll rapidly presses the strip steel, the head of the strip steel is subjected to primary bending, the head of the strip steel enters the pinch roll II 36 under the guide of the outlet valve and the guide plate to be subjected to secondary bending, the head of the strip steel reaches the winding assisting rolls under the guide of the arc-shaped guide plate 41, the winding assisting rolls rapidly press the strip steel respectively, the winding drum rapidly tensions the strip steel after the strip steel rotates 2-3 circles around the winding drum, at the moment, the strip steel and the winding drum do not move relatively, when the strip steel winding is rapidly finished, the coil discharging trolley 39 is slowly lifted at low pressure to drag the steel coil until the winding is finished, and when the coil discharging trolley 39 leaves the winding machine, the winding machine 40 recovers.

The centering device I31 comprises an inclined section side guide plate 311, a parallel section side guide plate 312, a rotating shaft 313, an oil cylinder 314, a push rod 315, a synchronizing shaft 316 and a transmission case II 317, wherein the parallel section side guide plate 312 is arranged on one side of the inclined section side guide plate 311, the rotating shaft 313 is arranged between the inclined section side guide plate 311 and the parallel section side guide plate 312 and is movably connected with the same, the oil cylinder 314 is arranged on one side of the parallel section side guide plate 312, a group of push rods 315 are arranged on two sides of the oil cylinder 314, the transmission case II 317 is arranged on one side of the push rod 315, the synchronizing shaft 316 is arranged in the transmission case II 317, when strip steel enters the centering device I31, the oil cylinder 314 provides power to drive the parallel section side guide plate 312 to move, the parallel section side guide plate 312 drives the inclined section side guide plate 311 to move back and forth around the rotating shaft 313 so as to realize the centering process of the strip steel, meanwhile, the parallel section side guide plate, the two push rods 315 are moved simultaneously to achieve parallel movement of the parallel section side guides 312 against tilting.

The strip steel intercepting device 35 comprises a support 351, a waste hopper 352, a sliding plate 353 and a base 354, wherein the support 351 is arranged at one side of the coiling device 3, the base 354 is arranged at the other side of the support 351, the waste hopper 352 is arranged at the upper part of the base 354, the sliding plate 353 is arranged at one side of the waste hopper 352, the bottom surface of the waste hopper 352 is directly connected with the support 351, the side surface of the waste hopper is directly connected with the sliding plate 353 through the base 354, and the waste hopper 352 can be prevented from; the waste steel moving at high speed directly enters the waste hopper 352 through the sliding plate 353, so that the influence of long-time accumulation of the waste steel on normal coiling work is prevented, meanwhile, the strip steel bent for the second time is fed into the coiling machine 40 under the guidance of the arc-shaped guide plate 41 through the pinch roll II 36, and the coiling work process is carried out.

The scrap hopper 352 is a welding part with a C-shaped structure, and can buffer scrap steel moving at high speed, so that a binding line is prevented from being punched out, and safety accidents are prevented.

The intermediate guide plate 23 is provided at one side thereof with support rollers 27, and the support rollers 27 support the work rolls when the rolling of the steel sheet is completed, thereby improving the overall rigidity.

A protective cover 28 is arranged on a rack in the finish rolling device 2, and the protective cover 28 can prevent dust generated in the rolling process from entering a rolling mill.