Tandem type hot rolling roughing mill unit

Abstract

The utility model provides a tandem type hot rolling roughing mill unit capable of adjusting the tension force of a plate blank according to the operation condition of the plate blank between a front horizontal rolling mill and a rear horizontal rolling mill so as to solve the problem that steel piling or rolling breakage accidents are prone to occurring in the continuous rolling process. A hot rolling tandem type roughing mill unit comprises a first vertical rolling mill, a first horizontal rolling mill, a second horizontal rolling mill and a second vertical rolling mill which are sequentially arranged along the same straight line, and a tension control mechanism and at least two conveying rollers are arranged between the first horizontal rolling mill and the second horizontal rolling mill. The tension control mechanism comprises loop roller mounting blocks, a lifting mechanism and a loop roller parallel to the conveying roller, the two ends of the loop roller are mounted on the loop roller mounting blocks at the two ends respectively, and the lifting mechanism is connected with the loop roller mounting blocks so as to control lifting of the loop roller mounting blocks; the conveying rollers are arranged on the two sides of the loop roller. According to the utility model, the production efficiency and the production quality of slabs can be improved.

Description

Technical Field

[0001] The utility model relates to the field of metallurgical steel rolling equipment, in particular to a hot rolling tandem rough rolling mill group. Background Art

[0002] In the past two decades, with the progress of metallurgical equipment manufacturing level and automation control level, the newly built or renovated hot rolling production lines all adopt semi-continuous rolling process, equipped with two rough rolling mills, and the raw material billet is rolled into the intermediate billet thickness (30-70mm) required by the process through multiple reversible rolling, meeting the rolling requirements of the finishing mill. Among them, according to the process requirements, the two rough rolling mills generally adopt a long-distance (80000-90000mm) layout type, using 1+5, 3+3, 3+5, 1+7 rolling modes, and the two rough rolling mills complete the corresponding work independently without interfering with each other. The conventional hot rolling production process can make the temperature of the intermediate billet uniform, but it still has the disadvantages of many rolling passes, large temperature drop in the rough rolling area of ​​the strip, large equipment footprint, and high plant investment cost.

[0003] In order to reduce the investment in plant buildings and the temperature drop in the rough rolling zone of the strip, the Chinese patent application number 200820010735.2 discloses a hot rolling double-stand reversible continuous rolling mill, which is composed of a vertical-horizontal-horizontal-vertical combined reversible continuous rolling mill, which is sequentially installed on the working ground from the inlet of the rolled plate to the outlet of the finished rolled plate, with I# vertical rolling mill, I# horizontal rolling mill, II# horizontal rolling mill and II# vertical rolling mill installed in sequence. However, during the production process, especially when continuously rolling thin plates with a width of more than 2 meters, the reversible continuous rolling mill is prone to pile steel or rolling break accidents due to the inconsistent rolling speeds of the front and rear horizontal rolling mills, which affects the production efficiency and production quality of the slab. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a hot rolling tandem rough rolling mill group which can adjust the tension of the slab according to the running conditions of the slab between the front and rear horizontal rolling mills, so as to solve the problem of steel piling or rolling breakage accidents that are prone to occur during continuous rolling.

[0005] The technical solution adopted by the utility model to solve the technical problem is: a hot rolling tandem rough rolling mill group, comprising a first vertical rolling mill, a first horizontal rolling mill, a second horizontal rolling mill and a second vertical rolling mill arranged in sequence along the same straight line, and a tension control mechanism and at least two conveying rollers are provided between the first horizontal rolling mill and the second horizontal rolling mill;

[0006] The tension control mechanism includes a looping roller mounting block, a lifting mechanism and a looping roller arranged in parallel with the conveying roller. The looping roller mounting blocks are two and are respectively arranged at the two ends of the looping roller. The two ends of the looping roller are respectively mounted on the looping roller mounting blocks at the two ends. The lifting mechanism is connected to the looping roller mounting block to control the lifting of the looping roller mounting block.

[0007] The conveying rollers are arranged on both sides of the looper roller.

[0008] Furthermore, the tension control mechanism also includes a support frame, the support frame is provided with a groove opening upward, and the looper roller mounting block is embedded in the groove and slidably cooperates with the groove.

[0009] Furthermore, the lifting mechanism is a hydraulic cylinder arranged below the looper roller mounting block.

[0010] Furthermore, a vertically arranged guide rod is fixedly provided on the loop roller mounting block, a guide sleeve is provided on the support frame which is sleeved on the guide rod and slidably cooperates with the guide rod, and a limit support block is provided on the support frame which cooperates with the guide rod to limit the downward stroke of the loop roller to a position flush with the conveying roller.

[0011] Furthermore, the limiting support block is connected to the support frame by bolts.

[0012] Furthermore, a cooling channel extending along the axial direction of the looper roller is provided in the looper roller.

[0013] Furthermore, the first horizontal rolling mill and the second horizontal rolling mill both adopt four-roller rolling mills, and the plate thickness control cylinders of the first horizontal rolling mill and the second horizontal rolling mill are both arranged below the lower support roller.

[0014] Furthermore, liftable guide plates are provided above the inlet and outlet of the first horizontal rolling mill and the second horizontal rolling mill, and vertical flues are provided on the guide plates.

[0015] The beneficial effects of the utility model are as follows: the hot rolling tandem rough rolling mill group of the utility model, since a tension control mechanism and at least two conveying rollers are provided between the first horizontal rolling mill and the second horizontal rolling mill, when rolling thin-gauge plates, the looper rollers and the conveying rollers can not only convey the slabs, but also can control the lifting and lowering of the looper roller mounting block through the lifting mechanism according to the running conditions of the slabs between the first horizontal rolling mill and the second horizontal rolling mill, so that the looper rollers can rise or fall to adjust the tensioning force of the slabs, so that the slabs between the first horizontal rolling mill and the second horizontal rolling mill maintain a certain micro-tension, satisfying the principle of equal second flow rate between rolling mills, thereby avoiding the phenomenon of steel piling or breaking, and improving the production efficiency and production quality of the slabs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model;

[0017] Figure 2 It is a structural schematic diagram of the tension control mechanism;

[0018] Figure 3 It is a schematic diagram of the structure of a horizontal rolling mill;

[0019] As shown in the figure: the first vertical roll mill 1, the first horizontal roll mill 2, the second horizontal roll mill 3, the second vertical roll mill 4, the conveying roller 5, the tension control mechanism 6, the plate thickness control cylinder 7, the guide plate 8, the smoke pipe 9, the looper roller 61, the looper roller mounting block 62, the support frame 63, the lifting mechanism 64, the groove 65, the guide rod 66, the guide sleeve 67, the limit support block 68, the cooling channel 611, the flue 81, the bellows 82, the atomizing nozzle 83, the dephosphorization device 84, and the strip cooling device 85. DETAILED DESCRIPTION

[0020] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0021] like Figure 1 , Figure 2 As shown, a hot rolling tandem rough rolling mill group of the utility model comprises a first vertical rolling mill 1, a first horizontal rolling mill 2, a second horizontal rolling mill 3 and a second vertical rolling mill 4 arranged in sequence along the same straight line. A tension control mechanism 6 and at least two conveying rollers 5 for conveying slabs are arranged between the first horizontal rolling mill 2 and the second horizontal rolling mill 3. The tension control mechanism 6 is used to control the tension of the slab between the first horizontal rolling mill 2 and the second horizontal rolling mill 3. The tension control mechanism 6 comprises a looper roller mounting block 62, a lifting mechanism 64 and a looper roller 61 arranged parallel to the conveying roller 5. The looper roller mounting block 62 is composed of two blocks respectively arranged at the two ends of the looper roller 61. The two ends of the looper roller 61 are respectively mounted on the looper roller mounting blocks 62 at the two ends. The lifting mechanism 64 is connected to the looper roller mounting block 62 to control the lifting and lowering of the looper roller mounting block 62. The conveying roller 5 is arranged on both sides of the looper roller 61.

[0022] In the present invention, the conveying rollers 5 are generally an even number and are symmetrically arranged on both sides of the looper roller 61 .

[0023] The lifting mechanism 64 generally adopts a hydraulic cylinder. In certain embodiments, the lifting mechanism 64 also adopts an electric push rod.

[0024] Similar to the existing reversible continuous rolling mill, the specific working process of the tandem rough rolling mill of the utility model is as follows: during the first pass of forward rolling, the first vertical roller mill 1, the first horizontal rolling mill 2 and the second horizontal rolling mill 3 are continuously rolled, and the second vertical roller mill 4 is at the maximum opening position. During the second pass of reverse rolling, the second vertical roller mill 4, the second horizontal rolling mill 3 and the first horizontal rolling mill 2 are continuously rolled, and the first vertical roller mill 1 is at the maximum opening position. During the third pass of forward rolling, the first vertical roller mill 1, the first horizontal rolling mill 2 and the second horizontal rolling mill 3 are continuously rolled, and the second vertical roller mill 4 is at the maximum opening position. By analogy, multiple passes of repeated rolling can be achieved to produce intermediate billets. The tandem rough rolling mill can achieve two large reduction rollings of a slab in one pass, especially for some varieties of steel that require a large compression ratio, it can refine the grain structure inside the slab to the greatest extent, and improve the intrinsic quality and performance of the slab. Since the rough rolling mill of the utility model is provided with a tension control mechanism 6 and at least two conveying rollers 5 between the first horizontal rolling mill 2 and the second horizontal rolling mill 3, the tension control mechanism 6 includes a looping roller 61, a roller mounting block 62 and a lifting mechanism 64 connected to the roller mounting block 62 for controlling the lifting and lowering of the looping roller mounting block 62. In this way, when thin-gauge plates are rolled, the looping roller 61 and the conveying roller 5 can not only convey the slab, but also control the lifting and lowering of the looping roller mounting block 62 through the lifting mechanism 64 according to the running conditions of the slab between the first horizontal rolling mill 2 and the second horizontal rolling mill 3, so that the looping roller 61 rises or falls to adjust the tension of the slab, so that the slab between the first horizontal rolling mill 2 and the second horizontal rolling mill 3 maintains a certain micro-tension, meets the principle of equal second flow between the rolling mills, and thus can avoid the phenomenon of steel piling or breaking. Specifically, when the slab tension between the first horizontal mill 2 and the second horizontal mill 3 is gradually reduced or steel pile occurs during the rolling of thin-gauge plates, the lifting mechanism 64 controls the looper roller 61 to rise to a certain height to ensure that the slab between the first horizontal mill 2 and the second horizontal mill 3 is within the required micro-tension range; when the tension of the slab between the first horizontal mill 2 and the second horizontal mill 3 is too tight, the lifting mechanism 64 controls the looper roller 61 to drop to a certain height. When thick-gauge plates are rolled, there will be no steel pile or breakage in the slab, and the lifting mechanism 64 controls the looper roller 61 to drop to a position flush with the conveying roller 5 to convey the slab normally.

[0025] like Figure 2 As shown, the tension control mechanism 6 further includes a support frame 63, on which a groove 65 opening upward is provided, and the looper roller mounting block 62 is embedded in the groove 65 and slidably cooperates with the groove 65. The looper roller mounting block 62 is arranged in the groove 65 on the support frame 63, and the groove 65 can better limit the looper roller mounting block 62, so that it can better withstand the impact during the rolling process.

[0026] When rolling thick gauge plates, the looper roller 61 needs to be lowered to a position flush with the conveyor roller 5 and remain stationary. At this time, the looper roller 61 does not need to move frequently. If the looper roller 61 and the looper roller mounting block 62 continue to be supported by the lifting mechanism 64, it will be more energy-consuming. For this reason, in the present utility model, if Figure 2 As shown, the looper roller mounting block 62 is fixed with a vertically arranged guide rod 66, the support frame 63 is provided with a guide sleeve 67 which is sleeved on the guide rod 66 and slidably cooperates with the guide rod 66, and the support frame 63 is provided with a limit support block 68 which cooperates with the guide rod 66 to limit the downward stroke of the looper roller 61 to a position flush with the conveying roller 5. In this way, the guide rod 66 can not only better guide the looper roller mounting block 62 to slide up and down during the lifting and lowering process of the looper roller mounting block 62, but also when rolling thick-gauge plates, the guide rod 66 can cooperate with the limit support block 68, so that the guide rod 66, the looper roller 61 and the looper roller mounting block 62 are supported by the limit support block 68, and the lifting mechanism 64 does not need to continue to support, which can be more energy-efficient. In the above structure, the guide rod 66 can be connected to the looper roller mounting block 62 by welding or bolting, the guide sleeve 67 can be set on the support frame 63 by welding, bolting or embedding, and the limit support block 68 can be set on the support frame 63 by welding or bolting. Since the looper roller 61 needs to be raised when rolling thin-gauge plates, its wear is greater than that of the conveyor roller 5. As time goes by, the limit support block 68 may not be able to limit the lower stroke of the looper roller 61 to a position flush with the conveyor roller 5. At this time, the limit support block 68 needs to be replaced. In order to facilitate the replacement of the limit support block 68, in the utility model, preferably, the limit support block 68 is bolted to the support frame 63.

[0027] In some embodiments, the bottom surface of the groove is also used as a supporting surface for the loop roller mounting block 62, so as to cooperate with the loop roller mounting block 62 to support the loop roller mounting block 62 when the loop roller 61 needs to be lowered to a position flush with the conveying roller 5. However, this can easily cause the groove to deform and affect the movement of the loop roller mounting block 62.

[0028] In the utility model, a cooling channel 611 extending along the axial direction of the looper roller 61 is provided in the looper roller 61 to facilitate cooling of the looper roller 61 and also reduce the weight of the looper roller 61 to make its response speed faster.

[0029] The first horizontal rolling mill 2 and the second horizontal rolling mill 3 can adopt various existing horizontal rolling mills, such as: a two-roll mill, a four-roll mill, and a six-roll mill. In the embodiment of the utility model, the first horizontal rolling mill 2 and the second horizontal rolling mill 3 both adopt four-roll mills. The four-roll mill has the characteristics of high rigidity and high precision, and can more accurately control the thickness of the slab. When the first horizontal rolling mill 2 and the second horizontal rolling mill 3 adopt four-roll mills, further, the plate thickness control cylinder 7 of the first horizontal rolling mill 2 and the second horizontal rolling mill 3 are both arranged below the lower support roller. The plate thickness control cylinder 7 is arranged below the lower support roller, which can realize the wear compensation of the lower roller system, and at the same time has a good regulating effect on the warping and buckling phenomena during the continuous rolling of the slab.

[0030] like Figure 3 As shown, a guide plate 8 that can be raised and lowered is provided above the entrance and exit of the first horizontal rolling mill 2 and the second horizontal rolling mill 3 to guide the slab into the rolling mill, and a vertical flue 81 is provided on the guide plate 8, and the flue 81 is connected to a flue pipe 9 fixed on the frame of the rolling mill through a bellows 82. The guide plate 8 is provided with a vertical flue 81, and the flue 81 can move together with the guide plate 8, and the flue gas generated during the rolling process can be quickly taken away through the flue.

[0031] Atomizing nozzles 83 may be provided inside the guide plate 8 as required, so that dust and iron scraps generated during the rolling process are combined with dense water mist to prevent volatilization, thereby playing a role in suppressing smoke. A dephosphorization device 84 and a strip cooling device 85 may also be provided on the first horizontal rolling mill 2 and the second horizontal rolling mill 3 as required to dephosphorize and cool the slab. The dephosphorization device 84 may be arranged in a double-row header.

Claims

1. A hot rolling tandem roughing mill group, comprising a first vertical rolling mill (1), a first horizontal rolling mill (2), a second horizontal rolling mill (3) and a second vertical rolling mill (4) arranged in sequence along the same straight line, characterized in that: A tension control mechanism (6) and at least two conveying rollers (5) are provided between the first horizontal rolling mill (2) and the second horizontal rolling mill (3); The tension control mechanism (6) comprises a looping roller mounting block (62), a lifting mechanism (64) and a looping roller (61) arranged parallel to the conveying roller (5); the looping roller mounting block (62) comprises two blocks and is respectively arranged at two ends of the looping roller (61); the two ends of the looping roller (61) are respectively mounted on the looping roller mounting blocks (62) at the two ends; the lifting mechanism (64) is connected to the looping roller mounting block (62) to control the lifting and lowering of the looping roller mounting block (62); The conveying roller (5) is arranged on both sides of the looper roller (61).

2. A hot rolling tandem roughing mill as claimed in claim 1, characterized in that: The tension control mechanism (6) further comprises a support frame (63), the support frame (63) being provided with a groove (65) opening upward, the looper roller mounting block (62) being embedded in the groove (65) and slidingly matched with the groove (65).

3. A hot rolling tandem roughing mill as claimed in claim 2, characterized in that: The lifting mechanism (64) is a hydraulic cylinder arranged below the looper roller mounting block (62).

4. A hot rolling tandem roughing mill as claimed in claim 2 or 3, characterized in that: A vertically arranged guide rod (66) is fixedly provided on the looper roller mounting block (62); a guide sleeve (67) sleeved on the guide rod (66) and slidably matched with the guide rod (66) is provided on the support frame (63); and a limit support block (68) is provided on the support frame (63) for matching with the guide rod (66) to limit the downward stroke of the looper roller (61) to a position flush with the conveying roller (5).

5. A hot rolling tandem roughing mill as claimed in claim 4, characterized in that: The position-limiting support block (68) is bolted to the support frame (63).

6. A hot rolling tandem roughing mill as claimed in claim 1, characterized in that: A cooling channel (611) extending along the axial direction of the looper roller (61) is provided in the looper roller (61).

7. A hot rolling tandem roughing mill as claimed in claim 1, characterized in that: The first horizontal rolling mill (2) and the second horizontal rolling mill (3) are both four-roll rolling mills, and the plate thickness control cylinders (7) of the first horizontal rolling mill (2) and the second horizontal rolling mill (3) are both arranged below the lower support roller.

8. The hot rolling tandem roughing mill according to claim 1, characterized in that: A liftable guide plate (8) is provided above the entrance and the exit of the first horizontal rolling mill (2) and the second horizontal rolling mill (3), and a vertical flue (81) is provided on the guide plate (8).

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