CN212857121U - Fine grain reinforcing bar roll line - Google Patents

Abstract

The utility model relates to a fine grain reinforcing steel bar rolling line, which comprises a 6-frame roughing mill group, a 10-frame middle mill group and a 4-frame finishing mill group; one of the sixth and seventh rolling mills is a horizontal rolling mill, and the other is a vertical rolling mill; one of the ninth and tenth rolling mills is a horizontal rolling mill, and the other is a vertical rolling mill; the second and fourth middle rolling mills are vertical rolling mills, and the other middle rolling mills are horizontal rolling mills; at least one of the intermediate rolling mills is simultaneously provided with a splitting roller with a splitting rolling pass and a single-line roller with a single-line rolling pass. The utility model can realize single line rolling production and splitting rolling production based on the arrangement form of the specific intermediate mill set, and improve the application range of the fine grain reinforcing steel bar rolling line; the utility model discloses it is rolling to accomplish the segmentation of fine grain reinforcing bar at well rolling in-process, and two reinforcing bars after the segmentation get into the rolling of finishing mill group again after water cooling device cools off in advance, can realize the rolling of the control of the most genuine fine grain reinforcing bar.

Description

Fine grain reinforcing bar roll line

Technical Field

The utility model belongs to the technical field of the steel rolling, concretely relates to fine grain reinforcing bar roll line.

Background

At present, in the conventional fine-grained steel bar production line, the production process of slitting and rolling is mostly adopted to improve the yield of the fine-grained steel bar production line. The rolling mill area arrangement of the conventional fine-grain steel bar rolling production line is as follows: the method comprises the steps of a roughing mill group 1(6 roughing mills), a middle mill group 2(6 middle mills), a pre-water cooling device 3, a flying shear before finish rolling 4, a finishing mill group 5(6 finishing mills), and a water-through cooling device. Wherein, the 6 rough rolling mills and the 6 middle rolling mills are arranged horizontally and vertically alternately, and the finishing rolling mills are arranged to be 13H-14V-15H-16H/V-17H-18H/V. (H represents a horizontal rolling mill, V represents a vertical rolling mill, and H/V represents a horizontal-vertical transition rolling mill). On a conventional fine-grain steel bar rolling production line, the slitting rolling is completed between 13H-16H/V frames (a finishing mill group 5); after the fine grain steel bars are cut and rolled, the fine grain steel bars are rolled by two rolling mills of 17H-18H/V and enter a water cooling device for cooling. The hot-rolled fine-grained steel bar production line has some outstanding problems:

(1) the production mode is single, only a single-line production mode or a splitting production mode is adopted, and the production application range is relatively narrow;

(2) 780-820 deg.C is the dynamic recrystallization temperature of internal grain structure of fine-grain steel bar. After the splitting rolling, the general rolled piece has a large temperature rise, and a water cooling device is not used for controlling the temperature of the rolled piece after the splitting rolling, so that the finish rolling temperature of the rolled piece in the finishing mill group 5 is high, generally about 900 ℃, the control rolling is not realized, and the control rolling process in a real sense cannot be realized. Therefore, the quality of the steel bar produced by the conventional fine-grained steel bar production line is not high, and a large amount of alloy elements must be added if the high-quality fine-grained steel bar needs to be produced.

(3) After slitting rolling, the dimensional accuracy of rolled pieces is low, but the rolled pieces are rolled by two 17H-18H/V rolling mills in the following process, so that the accuracy of the slit rolled steel bars is difficult to control effectively, and the control of the product accuracy is not facilitated.

SUMMERY OF THE UTILITY MODEL

The utility model relates to a fine grain reinforcing bar roll line can solve prior art's partial defect at least.

The utility model relates to a fine grain reinforcing bar rolling line, include the roughing mill group, the intermediate rolling mill group, the water cooling device in advance, the finish rolling mill group and the finish rolling after-control cooling device that arrange in proper order along the rolled piece traffic direction, the roughing mill group includes 6 roughing mills, the intermediate rolling mill group includes 10 intermediate rolling mills, the finish rolling mill group includes 4 finish rolling mills;

one of the sixth medium rolling mill and the seventh medium rolling mill is a horizontal rolling mill, and the other one is a vertical rolling mill; one of the ninth middle rolling mill and the tenth middle rolling mill is a horizontal rolling mill, and the other one is a vertical rolling mill; the second middle rolling mill and the fourth middle rolling mill are both vertical rolling mills, and the rest middle rolling mills are both horizontal rolling mills; loops are uniformly arranged between the fifth middle rolling mill and the sixth middle rolling mill, between the seventh middle rolling mill and the eighth middle rolling mill, and between the eighth middle rolling mill and the ninth middle rolling mill; at least one of the intermediate rolling mills is simultaneously provided with a splitting roller with a splitting rolling pass and a single-line roller with a single-line rolling pass.

As one embodiment, the arrangement form of the rolling mills of the middle rolling mill group is 7H-8V-9H-10V-11H-12H-13V-14H-15H-16V, wherein H is a horizontal rolling mill, and V is a vertical frame; the rolling mills in the third to sixth stands are all provided with splitting rollers, so that 9H-10V-11H-12H is formed into splitting rolling sections.

In one embodiment, two flying shears before finish rolling are arranged between the intermediate mill group and the finishing mill group side by side.

As one embodiment, the pre-cooling device comprises a plurality of pre-cooling boxes arranged at intervals along the running direction of the rolled piece, a rolled piece transportation roller way between two adjacent pre-cooling boxes and a rolled piece transportation roller way between the pre-cooling device and the finishing mill group are divided into 3 running channels by partition plates, each running channel comprises a middle channel for conveying a single-line rolled piece and two edge channels for conveying two cut rolled pieces, and the two edge channels are located on two sides of the middle channel.

In one embodiment, the rolling mills in the first to seventh stands are all

Rolling mills in the eighth to tenth stands

And (4) rolling mills.

As one embodiment, the arrangement form of the rolling mills of the finishing mill group is 17H-18H/V-19H-20H/V, wherein H is a horizontal rolling mill, V is a vertical rolling mill, and H/V is a horizontal-vertical conversion rolling mill.

In one embodiment, the arrangement of the rolling mills of the roughing mill train is 1H-2V-3H-4V-5H-6V, wherein H is a horizontal rolling mill and V is a vertical rolling mill.

As one embodiment, the pre-cooling device comprises a plurality of pre-cooling boxes arranged at intervals along the running direction of the rolled piece, and temperature measuring units are respectively arranged at the inlet of each pre-cooling box, the inlet of the finishing mill group, the inlet of the finish rolling post-finish rolling cooling device and the outlet of the finish rolling post-finish rolling cooling device.

The utility model discloses following beneficial effect has at least:

the utility model provides a fine grain reinforcing bar roll line is different from traditional 6 frame in the rolling mill group layout form, adopts 10 frame in the rolling mill group to based on specific well rolling mill layout form, can realize two kinds of rolling modes of single line rolling production and segmentation rolling production, improve the application scope of fine grain reinforcing bar roll line effectively. The splitting rolling pass is distributed in the middle rolling mill unit, namely the splitting rolling of the fine grain steel bars is completed in the middle rolling process, and the two split steel bars are cooled by the water pre-cooling device and then enter the finishing mill unit for rolling, so that the control rolling of the fine grain steel bars can be realized in the real sense.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic view of an arrangement structure of a fine-grained steel bar rolling line provided by an embodiment of the present invention;

fig. 2 is a schematic view of an arrangement structure of a middle rolling mill group provided by the embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention are described below clearly and completely, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1 and fig. 2, an embodiment of the present invention provides a fine-grained steel bar rolling line, including a roughing mill group 1, a middle mill group 2, a pre-water cooling device 3, a finishing mill group 5 and a finish rolling post-finish rolling cooling control device 6 that are sequentially arranged along a rolling piece moving direction, where the roughing mill group 1 includes 6 roughing mills, the middle mill group 2 includes 10 middle mills, and the finishing mill group 5 includes 4 finishing mills;

one of the sixth medium rolling mill and the seventh medium rolling mill is a horizontal rolling mill, and the other one is a vertical rolling mill; one of the ninth middle rolling mill and the tenth middle rolling mill is a horizontal rolling mill, and the other one is a vertical rolling mill; the second middle rolling mill and the fourth middle rolling mill are both vertical rolling mills, and the rest middle rolling mills are both horizontal rolling mills; loops 7 are respectively arranged between the fifth middle rolling mill and the sixth middle rolling mill, between the seventh middle rolling mill and the eighth middle rolling mill, and between the eighth middle rolling mill and the ninth middle rolling mill; at least one of the intermediate rolling mills is simultaneously provided with a splitting roller with a splitting rolling pass and a single-line roller with a single-line rolling pass.

Preferably, the 6 roughing mills of the roughing mill group 1 are arranged in a horizontal-vertical alternating manner, the first roughing mill, the third roughing mill and the fifth roughing mill are all flat mills, and the second roughing mill, the fourth roughing mill and the sixth roughing mill are all vertical mills, that is, the arrangement of the mills of the roughing mill group 1 is 1H-2V-3H-4V-5H-6V, wherein H is a horizontal mill and V is a vertical mill.

The fine-grained steel bar rolling line provided by the embodiment is different from the traditional arrangement form of the rolling mill group 2 in the 6 stands, the rolling mill group 2 in the 10 stands is adopted, and based on the specific arrangement form of the medium rolling mill, two rolling modes of single-line rolling production and splitting rolling production can be realized, so that the application range of the fine-grained steel bar rolling line is effectively enlarged. Specifically, in the two rolling modes, the sixth medium rolling mill is not used at the same time as the seventh medium rolling mill, and the ninth medium rolling mill and the tenth medium rolling mill are not used at the same time, wherein: in the single-line rolling production, the horizontal rolling mill passes through the vertical rolling mill in the sixth, seventh, ninth and tenth middle rolling mills; in the splitting rolling production, the vertical rolling mill passes through the horizontal rolling mill in the sixth, seventh, ninth and tenth rolling mills.

In one embodiment, as shown in fig. 2, the sixth medium rolling mill is a horizontal rolling mill, and the seventh medium rolling mill is a vertical rolling mill; the ninth middle rolling mill is a horizontal rolling mill, the tenth middle rolling mill is a vertical rolling mill, namely the arrangement form of the rolling mills of the middle rolling mill group 2 is 7H-8V-9H-10V-11H-12H-13V-14H-15H-16V, wherein H is the horizontal rolling mill, and V is a vertical frame. Then, 7H-8V-9H-10V-11H-13V-14H-16V constitutes the intermediate mill train 2 in the single-line rolling mode; the 7H-8V-9H-10V-11H-12H-14H-15H constitutes the intermediate mill train 2 in the split rolling mode.

As can be appreciated, for a medium mill equipped with both a splitting roll and a single-line roll, the splitting roll is used in combination with the single-line roll: in the single-line rolling production, a single-line roller is adopted by the medium rolling mill, and a split roller is off-line for standby; in the splitting rolling production, the middle rolling mill adopts a splitting roller, and a single-line roller is fed for standby. The replacement of the roller is the conventional operation in the rolling production line, and the operation is convenient and easy.

The splitting rolling of the fine-grained steel bars is generally completed on a plurality of continuously arranged rolling mills, and is a continuously performed process, namely, the middle rolling mill provided with the splitting rollers is provided with a plurality of rolling mills, the splitting rolling of the fine-grained steel bars through the splitting rolling pass is a conventional technology in the field, different splitting rolling passes can be adopted according to needs, and specific details are not described herein.

According to the fine-grained steel bar rolling production line provided by the embodiment, the splitting rolling pass is distributed in the intermediate rolling mill unit 2, namely, the splitting rolling of fine-grained steel bars is completed in the intermediate rolling process, and the two split steel bars are cooled by the pre-water cooling device 3 and then enter the finishing mill unit 5 for rolling, so that the control rolling of the fine-grained steel bars can be realized in the real sense.

Preferably, the splitting and rolling of the steel bars are completed in the middle section of the intermediate mill group 2, and after the splitting and rolling, the rolled piece is rolled by a plurality of subsequent intermediate mills and a plurality of subsequent finishing mills, so that the size precision of the rolled piece can be effectively controlled. In the arrangement of the 7H-8V-9H-10V-11H-12H-13V-14H-15H-16V intermediate mill train 2, it is preferable that the third to sixth intermediate mills are each provided with a slitting roll so that the 9H-10V-11H-12H constitutes a slitting rolling section. In the 7H-8V-9H-10V-11H-12H-14H-15H splitting medium rolling mill unit 2, a steel bar is rolled by 7H-8V and enters a splitting rolling section to be split and rolled into two steel bars, then the two steel bars simultaneously enter 14H-15H for rolling, the section of the rolled piece is circular, and the two steel bars are finish rolled by 4 rolling mills of the finishing mill unit 5, so that the required fine grain steel bar rolling effect and efficiency can be obtained, and the quality of the produced fine grain steel bar, such as dimensional accuracy and the like, can be ensured.

In the embodiment, preferably, the rolling mills in the first frame to the seventh frame are all 450 rolling mills, the diameter of the roller body is within the range of 410-470 mm, and the length of the roller body is about 750 mm; the eighth to tenth middle rolling mills

The diameter of a roller body of the rolling mill is within the range of 320-380 mm, and the length of the roller body is about 650 mm. The selection of the specification of the rolling mill is beneficial to the improvement of the rolling quality in the fine-grained steel bar.

Preferably, the pre-water cooling device 3 cools the rolled piece to 780-820 ℃ according to the water cooling curve of the fine-grained steel bar, and then the rolled piece enters the finishing mill unit 5, so that the requirement of the fine-grained steel bar on a control rolling process system is met, and the control rolling effect of the fine-grained steel bar is better. The pre-cooling device 3 can adopt a water cooling tank which is conventional in the field, and particularly, the pre-cooling device 3 comprises a plurality of pre-cooling tanks which are arranged at intervals along the running direction of a rolled piece. Optionally, the precooling tank adopts a DANIELI type + turbulent tube nozzle and a sealed box type structure, the length of the cooling nozzle is 805mm, and a water and gas back blowing device is arranged to prevent the cooling medium from overflowing. The precooling box is internally provided with a water penetrating device or a bypass roller way, and the installation size requirements of the bypass roller way and the water penetrating device can be interchanged and are convenient for replacement operation: when the rolled piece needs water cooling, the water penetrating device is arranged in the precooling box; when the rolled piece does not need to be cooled, a bypass roller way is arranged at the position of the water penetrating device of the pre-cooling box (the water penetrating device needs to be detached). In an optimized scheme, a rolled piece conveying roller way between two adjacent precooling boxes and a rolled piece conveying roller way between a precooling device 3 and a finishing mill group 5 are divided into 3 operating channels by partition plates, the operating channels comprise a middle channel for conveying a single-line rolled piece and two edge channels for conveying two split rolled pieces, the two edge channels are positioned on two sides of the middle channel (obviously, the edge channels and the middle channels are arranged along the axial direction of the rolled piece conveying roller), the scheme is convenient for switching and normal operation of two rolling modes of single-line rolling production and split rolling production, the rolled piece precooling effect required by the single-line rolling production and the split rolling production is ensured, and the rolled piece supercooling is avoided. Furthermore, a cover plate is arranged above the partition plate, and the cover plate above the corresponding channel is uncovered according to the corresponding rolling mode.

And continuing the fine grain steel bar rolling production line, arranging two flying shears 4 before finish rolling between the middle rolling unit 2 and the finishing rolling unit 5 side by side, and meeting the requirements of shearing operation before finish rolling in two rolling modes of single-line rolling production and split rolling production. After the splitting rolling, one fine-grained steel bar is split into two fine-grained steel bars, and the two pre-finish rolling flying shears 4 are used for respectively performing pre-finish rolling shearing on the split two fine-grained steel bars, such as head cutting. The two flying shears 4 before finish rolling are arranged side by side, namely the arrangement direction of the two flying shears is vertical to the advancing direction of the fine-grained steel bars. The two pre-finishing flying shears 4 are preferably arranged between the pre-water cooling device 3 and the finishing mill train 5.

The fine grain steel bar rolling production line is further optimized, the arrangement form of the rolling mills of the finishing mill group 5 is 17H-18H/V-19H-20H/V, wherein H is a horizontal rolling mill, V is a vertical rolling mill, and H/V is a horizontal-vertical conversion rolling mill. Taking 17H as an example, 17 represents the 17 th rolling mill of the fine-grained steel bar rolling production line and is also the first finishing mill of the finishing mill group 5, and H represents that the rolling mill is a horizontal rolling mill, which is a general representation mode in the field; in more specific terms, the 4 stands of the finishing train 5 are arranged in the form of: along the running direction of a rolled piece, the 1 st to the 4 th finish rolling mills are sequentially a horizontal rolling mill, a vertical conversion rolling mill, a horizontal rolling mill and a vertical conversion rolling mill, wherein the vertical conversion rolling mill mainly considers two types of rolling of round steel and threaded steel.

The controlled cooling device 6 after finish rolling can adopt a water through cooling device which is conventional in the field, and the specific structure of the controlled cooling device is not described in detail herein.

Preferably, temperature measuring units are respectively arranged at the inlet of each pre-cooling box, the inlet of the finishing mill group 5, the inlet of the finish rolling post-cooling control device 6 and the outlet of the finish rolling post-cooling control device 6, and the temperature measuring units can adopt temperature measuring equipment such as an infrared pyrometer and the like, so that accurate temperature measurement within the range of 300-1200 ℃ can be realized.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. The utility model provides a fine grain reinforcing bar roll line, includes the controlled cooling device after roughing mill group, well rolling mill group, water-cooling device in advance, finishing mill group and the finish rolling that arrange in proper order along rolled piece traffic direction, its characterized in that: the roughing mill group comprises 6 roughing mills, the intermediate mill group comprises 10 intermediate mills, and the finishing mill group comprises 4 finishing mills;

one of the sixth medium rolling mill and the seventh medium rolling mill is a horizontal rolling mill, and the other one is a vertical rolling mill; one of the ninth middle rolling mill and the tenth middle rolling mill is a horizontal rolling mill, and the other one is a vertical rolling mill; the second middle rolling mill and the fourth middle rolling mill are both vertical rolling mills, and the rest middle rolling mills are both horizontal rolling mills; loops are uniformly arranged between the fifth middle rolling mill and the sixth middle rolling mill, between the seventh middle rolling mill and the eighth middle rolling mill, and between the eighth middle rolling mill and the ninth middle rolling mill; at least one of the intermediate rolling mills is simultaneously provided with a splitting roller with a splitting rolling pass and a single-line roller with a single-line rolling pass.

2. The fine grain steel bar rolling line of claim 1, wherein: the arrangement form of the rolling mills of the middle rolling mill group is 7H-8V-9H-10V-11H-12H-13V-14H-15H-16V, wherein H is a horizontal rolling mill, and V is a vertical frame; the rolling mills in the third to sixth stands are all provided with splitting rollers, so that 9H-10V-11H-12H is formed into splitting rolling sections.

3. The fine-grained steel reinforcing bar rolling line according to claim 1 or 2, characterized in that: two flying shears before finish rolling are arranged between the middle rolling mill group and the finishing rolling mill group side by side.

4. The fine-grained steel reinforcing bar rolling line according to claim 1 or 2, characterized in that: the pre-cooling device comprises a plurality of pre-cooling boxes arranged at intervals along the running direction of a rolled piece, a rolled piece conveying roller way between two adjacent pre-cooling boxes and a rolled piece conveying roller way between the pre-cooling device and the finishing mill group are separated into 3 running channels through partition plates, and the pre-cooling device comprises an intermediate channel used for conveying a single-line rolled piece and two edge channels used for conveying two split rolled pieces, wherein the edge channels are located on two sides of the intermediate channel.

5. The fine grain steel bar rolling line of claim 1, wherein: the first frame to the seventh frame are all rolling mills

Rolling mills in the eighth to tenth stands

And (4) rolling mills.

6. The fine grain steel bar rolling line of claim 1, wherein: the arrangement form of the rolling mills of the finishing mill group is 17H-18H/V-19H-20H/V, wherein H is a horizontal rolling mill, V is a vertical rolling mill, and H/V is a horizontal-vertical conversion rolling mill.

7. The fine grain steel bar rolling line of claim 1, wherein: the arrangement form of the rolling mills of the roughing mill group is 1H-2V-3H-4V-5H-6V, wherein H is a horizontal rolling mill, and V is a vertical rolling mill.

8. The fine grain steel bar rolling line of claim 1, wherein: the pre-cooling device comprises a plurality of pre-cooling boxes which are arranged at intervals along the running direction of a rolled piece, and temperature measuring units are respectively arranged at the inlet of each pre-cooling box, the inlet of the finishing mill group, the inlet of the finish rolling post-finish rolling cooling control device and the outlet of the finish rolling post-finish rolling cooling control device.

Images