A method for coiling strip steel

Abstract

The present application provides a method for coiling strip steel, which relates to the field of hot rolling technology in the metallurgical industry. The method includes the following steps: Step 1: If the strip head has entered the coiler, execute Step 2; If the strip head has not entered the coiler, manually coil the strip head into the coiler, and determine the length of the strip steel on the cold roller. If the strip steel length is too long, execute Step 2; Step 2: Before coiling, first open the second and third auxiliary coiling rollers to the maximum, close the first auxiliary coiling roller to the steel coil in the coiler, and at the same time, close the side guide plate until the strip steel is clamped to a slight bulge; Step 3: Rotate the coiler drum forward and reverse the transport roller until the strip steel is coiled. The present invention can safely and quickly coil the strip steel on the transport roller, saving time and improving efficiency; the present invention only requires one coiler to complete the coiling of all the strip steel on the transport roller; The present invention can quickly handle accidents using the equipment inherent in the production site.

Description

Technical Field

[0001] The present application relates to the field of hot rolling technology in the metallurgical industry, and in particular to a method for coiling a steel strip. Background Art

[0002] After the hot rolling coiler piles up the steel, the coiler needs to be used to manually coil the strip on the transport roller. Since the strip on the transport roller is too long and there are certain wrinkles on the strip itself, the steel coil is often not coiled densely after coiling. Ultimately, one coiler cannot complete the coiling of all the strip on the transport roller. It needs to be cut and then coiled again with other coilers. In addition, two coilers are required to manually unload and lift the steel coil at the same time. In this way, the time to resume steel production after the failure is relatively late, and the production time needs to be extended by about 12 minutes. In addition, the flatness of the steel coil makes it difficult to unload the coil. Summary of the Invention

[0003] The object of the present invention is to provide a method for coiling strip steel, which has the beneficial effects of saving time, improving efficiency, and only requiring one coiler to complete the coiling of all the strip steel on the transport roller, so as to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A strip steel coiling method is applied to a hot rolling production line, wherein the hot rolling production line is provided with a finishing mill, a transport roller, a coiler and a coil unloading trolley in the running direction, wherein the transport roller comprises a transport roller in front of a side guide plate, a transport roller at the side guide plate and a layer cooling roller, and a layer cooling outlet is provided at one end of the layer cooling roller;

[0006] The coiler comprises, in order of the hot rolling production line and the running direction, a side guide plate, a pressure roller, an upper pinch roller, a lower pinch roller, a first auxiliary winding roller, a second auxiliary winding roller, a third auxiliary winding roller and a reel, wherein a roller gap is formed between the upper pinch roller and the lower pinch roller;

[0007] The method comprises the following steps:

[0008] Step 1: If the strip head has entered the coiler, proceed to step 2; if the strip head has not entered the coiler, manually roll the strip head into the coiler and determine the length of the strip on the cold roller. If the strip length is too long, proceed to step 2;

[0009] Step 2: Before coiling, open the second and third auxiliary winding rollers to their maximum, close the first auxiliary winding roller to the steel coil in the coiler, and at the same time, close the side guide until the strip is clamped to a slight bulge;

[0010] Step 3: Rotate the coiler drum forward and reverse the transport roller at the same time until the strip coiling is completed.

[0011] As a further solution of the present invention: judging whether the length of the strip on the layer cold roller is too long according to the position of the strip head, when the strip head has reached the layer cold outlet, judging that the length of the strip on the layer cold roller is too long; judging whether the length of the strip on the layer cold roller is too long according to the length of the remaining slab after finishing rolling of the finishing mill, when the length of the remaining slab after finishing rolling is ≤2 / 3 of the total length of the slab, judging that the length of the strip on the layer cold roller is too long.

[0012] As a further solution of the present invention: before the coiler coils the strip steel, the strip steel on the transport roller at least 5 meters in front of the side guide plate is flattened.

[0013] As a further solution of the present invention: the first auxiliary winding roller is closed to the steel coil in the coiler, so that the first auxiliary winding roller contacts the strip steel, and the first auxiliary winding roller does not generate pressure, and the movement speed of the first auxiliary winding roller is 40 to 60 mm / s.

[0014] As a further solution of the present invention: the side guide plates are closed until the strip is clamped to a slight bulge, so that the opening of the side guide plates is 1 to 5 mm smaller than the actual width of the strip.

[0015] As a further solution of the present invention: the coiler drum rotates forward and the transport roller reverses at the same time until the strip coiling is completed, wherein the drum rotation speed is 1.5-2.5 m / s and the transport roller reversal speed is 0.5-1 m / s.

[0016] As a further solution of the present invention: when the strip is coiled until the tail of the strip reaches the front of the coiler, the rotation of the reel is stopped, and the unloading trolley is controlled to rise until it contacts the steel coil in the coiler without generating pressure; the reel is rotated to complete the unloading of the tail of the strip in one go.

[0017] As a further solution of the present invention: during the coiling process of the strip steel, determine whether the curvature of the strip steel itself is likely to cause the steel coil in the coiler to loosen; when the curvature is likely to cause the steel coil in the coiler to loosen, control the roller gap between the upper pinch roller and the lower pinch roller to 15 to 50 mm, and feed the bent strip steel into the coiler; and control the bent strip steel to reach under the pinch roller, and control the pinch roller to descend to eliminate the curvature.

[0018] As a further solution of the present invention: the thickness of the strip steel is ≤6.0 mm.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention can safely and quickly coil the strip steel on the transport roller, which not only saves time but also improves efficiency, and avoids the coil diameter being too large due to the loose coil and the inability to unwind the coil, which affects production time;

[0021] 3. The present invention only requires one coiler to complete the coiling of all the strip steels on the transport roller;

[0022] 2. The present invention does not require additional equipment or program modification, and accidents can be quickly handled using the inherent equipment on the production site. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0024] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings. In the following description, the same reference numerals represent the same parts.

[0025] Figure 1 A flow chart of a method for coiling strip steel provided in an embodiment of the present application.

[0026] Figure 2 A schematic structural diagram of a hot rolling production line for a strip coiling method provided in an embodiment of the present application.

[0027] Markings in the figure:

[0028] 1. Reel; 3. Side guide; 4. Transport roller; 5. Coil unloading trolley; 7. Strip steel; 8. Coiler frame; 9. Finishing mill;

[0029] 21. First winding roller; 22. Second winding roller; 23. Third winding roller;

[0030] 41. Transport roller at side guide plate; 42. Transport roller in front of side guide plate; 43. Layer cooling roller;

[0031] 61. Upper pinch roller; 62. Lower pinch roller; 63. Pressure roller. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0033] Please refer to the attached Figures 1-2The embodiment of the present application provides a strip coiling method, which is applied to a hot rolling production line. The hot rolling production line is provided with a finishing mill 9, a transport roller 4, a coiler and a coil unloading trolley 5 in the running direction. The transport roller 4 includes a transport roller 42 in front of the side guide plate, a transport roller 41 at the side guide plate and a layer cooling roller 43. A layer cooling outlet is provided at one end of the layer cooling roller 43.

[0034] The coiler comprises, in the running direction of the hot rolling production line, a side guide plate 3, a pinch roller 63, an upper pinch roller 61, a lower pinch roller 62, a first auxiliary winding roller 21, a second auxiliary winding roller 22, a third auxiliary winding roller 23 and a reel 1. A roller gap is formed between the upper pinch roller 61 and the lower pinch roller 62.

[0035] The method comprises the following steps:

[0036] Step 1: If the head of the strip 7 has entered the coiler, proceed to step 2; if the head of the strip 7 has not entered the coiler, manually wind the head of the strip 7 into the coiler and determine the length of the strip 7 on the cold roller 43. If the length of the strip 7 is too long or greater than the set value, proceed to step 2;

[0037] Further, whether the length of the strip 7 on the layer cold roller 43 is too long is judged according to the position of the head of the strip 7. Preferably, when the head of the strip 7 has reached the layer cold outlet, it is judged that the length of the strip 7 on the layer cold roller 43 is too long. Optionally, whether the length of the strip 7 on the layer cold roller 43 is too long is judged according to the remaining slab length after finishing rolling of the finishing mill 9. When the remaining slab length after finishing rolling is ≤ 2 / 3 of the total slab length, it is judged that the length of the strip 7 on the layer cold roller 43 is too long.

[0038] Specifically: In the prior art, after a steel pile accident occurs in the coiling area, the longer steel strip 7 will stay and pile up on the coiling transport roller 4. Since it is too long to be lifted out separately by the overhead crane, it needs to be rewound into the coiler and unloaded by the unloading trolley 5. However, the steel strip 7 itself at this time usually has certain wrinkles. After being re-rolled into a steel coil, there are gaps between the layers. The rolled steel coil will be flat, which is difficult to unload from the coiler. In addition, since the coil diameter is larger than the coiler frame 8 and cannot be unloaded, the steel strip 7 needs to be cut and re-wound into other coilers, which delays the accident recovery time. Before implementing this embodiment, the head of the steel strip 7 needs to be rolled into the coiler, and then the length of the steel strip 7 is determined. If the total length of the steel strip 7 is too short, this process does not need to be implemented; if the total length of the steel strip 7 is too long, this process is implemented. Specifically, when a fault occurs and the strip 7 stops after the head of the strip 7 is wound into the coiler, the length of the strip 7 is longer at this time; when a fault occurs and the strip 7 stops before the head of the strip 7 enters the coiler, if the head of the strip 7 has reached the layer cooling outlet when it stops, the length of the strip 7 is longer at this time; or, based on the remaining length of the slab that has not been completed in the finishing rolling, the remaining slab in the finishing rolling is ≤2 / 3 of the total length of the slab, and it is judged that the length of the strip 7 on the layer cooling roller 43 is too long.

[0039] Step 2: Before coiling, open the second and third auxiliary winding rollers 22 and 23 to their maximum, close the first auxiliary winding roller 21 to the coil inside the coiler, and at the same time, close the side guide 3 until the strip 7 is clamped until it bulges slightly.

[0040] Furthermore, the first winding roller 21 is closed to the steel coil in the coiler, so that the first winding roller 21 contacts the steel strip 7 and the first winding roller 21 does not generate pressure. The movement speed of the first winding roller 21 is 40-60 mm / s.

[0041] Specifically, before coiling, first open the second auxiliary winding roller 22 and the third auxiliary winding roller 23 to the maximum, and close the first auxiliary winding roller 21 until it contacts the steel coil on the reel 1 and the first auxiliary winding roller 21 does not generate pressure. During the process of coiling the strip steel 7, since the cold-coiled strip steel 7 itself has wrinkles or is uneven, if the steel coil is pressed hard with the auxiliary winding roller during coiling in order to prevent it from loosening, the strip steel 7 will deviate during coiling. As a result, the coil diameter on one side of the coil is larger and the coil diameter on the other side is smaller. Therefore, the first auxiliary winding roller 21 is closed until it contacts the steel coil on the reel 1 and the first auxiliary winding roller 21 does not generate pressure. During coiling, the first auxiliary winding roller 21 rotates together with the reel 1, and the first auxiliary winding roller 21 plays a role in guiding and stabilizing the coiling of the coiled strip steel 7. In this embodiment, the movement speed of the first auxiliary winding roller 21 is 40-60 mm / second;

[0042] Further, the side guide plate 3 is closed until the strip steel 7 is slightly bulged, so that the opening of the side guide plate 3 is 1 to 5 mm smaller than the actual width of the strip steel 7;

[0043] Specifically, before coiling, close the front side guide plate 3 of the coiler until the edge of the strip 7 is clamped to a slightly bulging state, and a certain tension is formed between the reel 1 and the side guide plate 3 during coiling. During specific implementation, the actual width of the strip 7 displayed by the width gauge can be referred to, and the side guide plate 3 can be closed to a value 1-5 mm smaller than the actual width of the strip 7.

[0044] Step 3: The coiler drum 1 is rotated forward and the transport roller 4 is rotated reversely until the strip 7 is coiled;

[0045] Furthermore, the rotation speed of the reel 1 is 1.5 to 2.5 m / s, and the reversal speed of the transport roller 4 is 0.5 to 1 m / s;

[0046] Furthermore, before the coiler coils the steel strip 7, the steel strip 7 on the transport roller 4 at least 5 meters in front of the side guide 3 is leveled;

[0047] Specifically, when coiling, the upper pinch roller 61 is closed to about 60mm and rotates at the same speed as the reel 1. The speed of the reel 1 is 1.5-2.5m / s. Generally, in order to complete the coiling of the strip steel 7 faster, a faster speed such as 3m / s, 4m / s is used. If the speed is too fast, the cold strip steel 7 itself will have a certain amount of wrinkles and bends, and the coiler will be unstable and shake when coiling. After the coiling is completed, the steel coil will be loosened and flattened as a whole. Therefore, in this embodiment, the speed of the reel 1 is 1.5-2.5m / s; at the same time, the strip steel 7 on the transport roller 4 will have a lot of bending when coiling, and some of the bending will be The strip 7 is wound into the coiler together and causes the coil to be loose. Therefore, in this embodiment, while rotating the reel 1, the transport roller 42 in front of the side guide of the coiler is rotated in the opposite direction to ensure that the strip 7 becomes straight and has no loosening before entering the side guide 3. At the same time, micro-tension can be generated among the reversed transport roller 4, the side guide 3 and the reel 1. In addition, in order to protect the roller surface of the transport roller 41 at the side guide, the transport roller 41 at the side guide does not rotate. In this embodiment, the reversing speed of the transport roller 42 in front of the side guide is 0.5-1m / s. If the reversal is too fast, it will slip and damage the roller surface of the transport roller 4. If the reversal is too slow, it cannot ensure that the strip 7 is straight before entering the side guide 3.

[0048] Furthermore, before the coiler coils the steel strip 7, the steel strip 7 on the side guide plate front transport roller 42 at least 5 meters in front of the side guide plate 3 is leveled;

[0049] Furthermore, during the coiling process of the steel strip 7, it is determined whether the steel strip 7 itself is bent and whether there is a possibility of causing the steel coil in the coiler to loosen. If there is a possibility of causing the steel coil in the coiler to loosen due to the bending, the gap between the upper pinch roller 61 and the lower pinch roller 62 is controlled to be 15 to 50 mm, and the bent steel strip 7 is fed into the coiler. The bent steel strip 7 is then controlled to reach under the pinch roller 63, and the pinch roller 63 is controlled to descend to eliminate the bending.

[0050] Specifically, during the coiling process of the steel strip 7, due to differences in the type and thickness of the steel strip 7, the steel strip 7 itself may bend to a certain extent. After entering the coiler, the steel strip 7 in the coiler will be loose. In this embodiment, when the bending height of the steel strip 7 exceeds the height of the side guide plate 3, it is determined that the bending may cause the steel coil in the coiler to be loose, and the upper pinch roller 61 is lowered to a roller gap of 15-50mm to eliminate the bending. After entering the coiler, the upper pinch roller 61 is raised again; the bending can also be controlled to reach below the pressure roller 63, and the pressure roller 63 is controlled to be lowered to eliminate the bending.

[0051] Furthermore, when the strip 7 is coiled and the tail of the strip 7 reaches the front of the coiler, the reel 1 is stopped from rotating, and the unloading trolley 5 is controlled to rise until it contacts the steel coil in the coiler without generating pressure; the reel 1 is rotated to complete the unloading of the tail of the strip 7 at one time;

[0052] Specifically: when the tail of the steel strip 7 reaches the front of the coiler, the reel 1 is stopped from rotating, and the unloading trolley 5 is controlled to contact the steel strip 7 without generating pressure. In the prior art, the size of the pressure is not displayed after the unloading trolley 5 contacts the steel coil, and only a signal of the coil pressure is received, but this pressure is relatively large. In this embodiment, when the tail of the steel strip 7 reaches the front of the coiler, the unloading trolley 5 is controlled to contact the steel coil but not to press the steel coil tightly, so as to prevent the steel strip 7 from deviating when it is wound into the coiler. Similarly, the reel 1 is rotated to fix the tail of the steel strip 7 at the appropriate position for unloading at one time, so as to avoid the steel coil rotating and fixing the tail multiple times in the coiler, which causes the outer ring of the steel coil to deviate.

[0053] In a preferred embodiment of the present invention, the thickness of the steel strip 7 is ≤6.0 mm.

[0054] The present invention can safely and quickly coil the steel strip 7 on the transport roller 4, which not only saves time but also improves efficiency, and avoids the coil diameter being too large and unable to be unloaded due to the loose coil of the coiled steel coil, thereby affecting the production time; the present invention only requires one coiler to complete the coiling of all the steel strips 7 on the transport roller 4; the present invention does not require additional equipment and program modifications, and can quickly handle accidents using the equipment inherent in the production site.

[0055] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0056] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more features.

[0057] This document uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for technical personnel in this field, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on this application.

Claims

1. A method for coiling a strip steel, characterized in that: Applied in hot rolling production line, the hot rolling production line is provided with finishing mill, transport roller, coiler and coil unloading trolley in the running direction, the transport roller includes transport roller in front of side guide plate, transport roller at side guide plate and layer cooling roller, and one end of the layer cooling roller is provided with layer cooling outlet; The coiler comprises, in order of the hot rolling production line and the running direction, a side guide plate, a pressure roller, an upper pinch roller, a lower pinch roller, a first auxiliary winding roller, a second auxiliary winding roller, a third auxiliary winding roller and a reel, wherein a roller gap is formed between the upper pinch roller and the lower pinch roller; The method comprises the following steps: Step 1: If the strip head has entered the coiler, proceed to step 2; if the strip head has not entered the coiler, manually wind the strip head into the coiler and determine the length of the strip on the cold roller. If the strip length is too long, proceed to step 2; The length of the strip on the cold roller table of the judgment layer includes: Judging whether the length of the strip on the layer cold roller is too long according to the position of the strip head; when the strip head has reached the layer cold outlet, it is judged that the length of the strip on the layer cold roller is too long; judging whether the length of the strip on the layer cold roller is too long according to the length of the remaining slab after finishing rolling in the finishing mill; when the length of the remaining slab after finishing rolling is ≤ 2 / 3 of the total length of the slab, it is judged that the length of the strip on the layer cold roller is too long; Step 2: Before coiling, open the second and third auxiliary rollers to their maximum, close the first auxiliary roller to the coil inside the coiler, make sure the first auxiliary roller is in contact with the strip without applying pressure, and at the same time, close the side guides until the strip is slightly bulged. Step 3: Rotate the coiler drum forward and reverse the transport roller at the same time until the strip coiling is completed.

2. The method for coiling a strip steel according to claim 1, characterized in that: Before the coiler coils the strip, the strip on the transport roller at least 5 meters in front of the side guide plate should be leveled.

3. The method for coiling a strip steel according to claim 1, characterized in that: The movement speed of the first auxiliary winding roller is 40-60 mm / s.

4. The method for coiling a strip steel according to claim 1, characterized in that: Close the side guide plates until the strip steel is clamped to a slight bulge, so that the opening of the side guide plates is 1 to 5 mm smaller than the actual width of the strip steel.

5. The method for coiling a strip steel according to claim 1, characterized in that: The coiler drum rotates forward and the transport roller is reversed at the same time until the strip coiling is completed, wherein the drum rotation speed is 1.5-2.5 m / s and the transport roller reversal speed is 0.5-1 m / s.

6. The method for coiling a strip steel according to claim 1, characterized in that: When the strip is coiled until the tail of the strip reaches the front of the coiler, the reel is stopped from rotating, and the unloading trolley is controlled to rise until it contacts the steel coil in the coiler without generating pressure; the reel is rotated to complete the unloading of the tail of the strip at one time.

7. The method for coiling a strip steel according to claim 1, characterized in that: During the coiling process of the strip steel, determine whether the bending of the strip steel itself is likely to cause the steel coil in the coiler to loosen; when the bending is likely to cause the steel coil in the coiler to loosen, control the roller gap between the upper pinch roller and the lower pinch roller to 15 to 50 mm, and feed the bent strip steel into the coiler; and control the bent strip steel to reach under the pinch roller, and control the pinch roller to descend to eliminate the bending.

8. The method for coiling a strip steel according to claim 1, characterized in that: The thickness of the strip steel is ≤6.0mm.

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