Method and device for uncoiling steel strip

Abstract

The present application provides a method and device for uncoiling steel strips, which relates to the hot rolling field of the metallurgical industry, a coil transport trolley, a ground roller, an uncoiler, a shearing blade, a straightening pinch roller, a reverse pressure roller, a steel turning roller, a steel turning arm and a lifting point; the shearing blade includes an upper shearing blade and a lower shearing blade. The method for uncoiling steel strips includes the following steps: Step 1: open the tail of the steel coil under the shearing blade, partially shear the tail of the steel coil and then lift the shearing blade to form a first shearing portion; Step 2: continue to uncoil for a certain distance, partially shear the steel coil, repeat n times to form a second shearing portion; Step 3: after the steel coil is uncoiled for a certain distance, cut off the opened part of the steel coil to form a steel plate, and inspect the steel plate. The present invention solves the problem that the strength of high-strength steel coils is too high and it is difficult to uncoil online, and at the same time solves the problem that the steel plate has a large rebound after being uncoiled and it is difficult to inspect the steel turning, thereby improving the efficiency of the surface inspection of the steel coil and the safety of the steel turning operation, while reducing the failure rate.

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 and device for uncoiling a steel strip. Background Art

[0002] In the prior art, after the production of hot-rolled strip steel is completed, a section of the tail steel plate needs to be cut off on the inspection line to inspect the surface of the strip steel online. When inspecting DP series steel, LAD series, weather-resistant steel, etc., the tail of the steel coil is opened to the shear blade. Due to the large resilience of high-strength steel, it is difficult to open the cut steel plate onto the turning roller. Even if it is opened onto the turning roller, the two ends of the cut steel plate are seriously warped due to the rebound, making it extremely difficult to turn the steel plate over, affecting the surface inspection. In the prior art, a reverse pressure roller and a straightening pinch roller are set after the inspection line shear blade to bend and send out the steel plate. The steel plate has a high hardness, which increases the failure rate of the equipment. At the same time, the steel plate is affected by the rolling of the pinch roller. In addition, the steel turning process is complicated, and the failure rate of the steel turning equipment is also high. Summary of the invention

[0003] The object of the present invention is to provide a method and device for uncoiling steel strip, which solves the problem that high-strength steel coils are too strong and difficult to uncoil online, and at the same time solves the problem that the steel plate has large rebound elasticity after being uncoiled and the steel is difficult to inspect during turning over, improves the efficiency of steel coil surface inspection and the safety of steel turning operations, and has the beneficial effect of reducing the failure rate, so as to solve the problems raised in the above-mentioned background technology.

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

[0005] A device for uncoiling steel strips is used in a hot rolling production line. The device comprises, in the running direction, a coil transport trolley, a ground roller, an uncoiler, a shearing blade, a straightening pinch roller, a reverse pressure roller, a steel turning roller table, a steel turning arm and a lifting point. The coil transport trolley is arranged between the ground rollers and is used to transport the steel coil. The steel coil is transported to the ground roller by the coil transport trolley and uncoiled by the uncoiler. The ground roller rotates to open the tail of the steel coil under the shearing blade. The shearing blade comprises an upper shearing blade and a lower shearing blade. The shearing blade is used to shear the steel coil. After the steel coil is sheared, a steel plate is formed. The steel turning arm is arranged on the steel turning roller table and is used to turn the steel plate.

[0006] As a further solution of the present invention: comprising a first operating platform, a second operating platform and a third operating platform, wherein the first operating platform is located at the entrance of the ground roller and is used to unwind the tail of the steel coil; the second operating platform is located at one side of the shear blade and is used to rotate and shear the steel coil and transport the steel plate to the steel turning roller;

[0007] A ruler is provided beside the shear blade and on the other side of the second operating table for judging the length of the first shearing portion; the third operating table is located on one side of the steel turning roller and is used for transporting and turning the steel plates.

[0008] Based on the same inventive concept, the present invention also provides a method for uncoiling a steel strip, the method comprising the following steps:

[0009] Step 1: transport the target steel coil to the inspection line roller by a coil transport trolley for uncoiling inspection, open the tail of the steel coil under the shear blade, partially shear the tail of the steel coil, and then lift the shear blade to form a first shearing portion;

[0010] Step 2: Continue to unwind for a certain distance, partially shear the steel coil, and repeat the process n times to form a second shearing portion;

[0011] Step 3: After the steel coil is opened for a certain distance, the opened portion of the steel coil is cut off to form a steel plate, and the steel plate is inspected.

[0012] As a further solution of the present invention: the target steel coil thickness is ≤6mm, and the yield strength is 235Mpa<600Mpa.

[0013] As a further solution of the present invention: 2 / 3 of the width of the steel coil is sheared transversely, and the tail of the steel coil is sheared for 0.4 to 0.6 m to form a first shearing portion.

[0014] As a further solution of the present invention: the steel coil is partially sheared, and the process is repeated n times, so that the steel coil is sheared to form a shear cut, and the shear cut divides the steel coil into multiple sections, wherein the distance of one section is 800 to 1400 mm; wherein 2≤n≤5; and the n times of shearing is transverse shearing of 1 / 2 to 2 / 3 of the width of the steel coil.

[0015] As a further solution of the present invention: the length of the second shearing portion is 4 to 5 meters; and the distance is 5 to 5.5 meters.

[0016] As a further solution of the present invention: the last of the n shearings is 500 mm to 800 mm away from the tail of the steel plate; wherein the transverse shearing is 2 / 3 of the width of the steel coil.

[0017] As a further solution of the present invention: after the inspection of the lower surface of the steel plate is completed, the steel plate is flipped up more than 90 degrees laterally by a steel flipping arm and dropped to a lifting point, and the steel plate is turned over to inspect the upper surface; a limiting portion is provided on the lifting point to position the steel plate.

[0018] As a further solution of the present invention: the bottom layer of steel plates includes at least five steel plates; the thickness of the bottom layer of steel plates is greater than or equal to 4.5 mm.

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

[0020] The present invention solves the problem of high-strength steel coils being too strong and difficult to unwind online, and also solves the problem of large rebound resilience of steel plates after unwinding and difficulty in steel turning inspection, thereby improving the efficiency of steel coil surface inspection and the safety of steel turning operations, while reducing the failure rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0022] 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.

[0023] Figure 1 A process of a method for uncoiling a steel strip is provided in an embodiment of the present application.

[0024] Figure 2 A schematic diagram of a device for uncoiling a steel strip provided in an embodiment of the present application.

[0025] Figure 3 A side view of a device for uncoiling a steel strip provided in an embodiment of the present application.

[0026] Markings in the figure:

[0027] 2. Uncoiler; 5. Steel turning roller; 7. Ground roller; 8. Coil transport trolley;

[0028] 11. steel coil; 12. steel plate; 121. first shearing portion; 122. second shearing portion;

[0029] 31. Upper shear blade; 32. Lower shear blade; 33. Ruler;

[0030] 41. Straightening pinch roller; 42. Reverse pressure roller;

[0031] 52. Turn over steel arm;

[0032] 61. Lifting point; 62. Limiting part;

[0033] 91. First operating station; 93. Third operating station. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0035] Please refer to the attached Figures 1 to 3 The embodiment of the present application provides a device for uncoiling steel strip, which is applied to a hot rolling production line. The device includes a coil transport trolley 8, a ground roller 7, an uncoiler 2, a shearing blade, a straightening pinch roller 41, a reverse pressure roller 42, a steel turning roller table 5, a steel turning arm 52 and a lifting point 61 according to the running direction. The coil transport trolley 8 is arranged between the ground rollers 7 and is used to transport a steel coil 11. The steel coil 11 is transported to the ground roller 7 by the coil transport trolley 8 and uncoiled by the uncoiler 2. The ground roller 7 rotates to open the tail of the steel coil 11 under the shearing blade; the shearing blade includes an upper shearing blade 31 and a lower shearing blade 32. The shearing blade is used to shear the steel coil 11. The steel coil 11 is sheared to form a steel plate 12; the steel turning arm 52 is arranged on the steel turning roller table 5 and is used to turn the steel plate 12.

[0036] A preferred embodiment of the present invention includes a first operating platform 91, a second operating platform, and a third operating platform 93. The first operating platform 91 is located at the entrance of the ground roller 7 and is used to unwind the tail of the steel coil 11; the second operating platform is located on the side of the shear blade and rotates and shears the steel coil 11 and transports the steel plate 12 to the steel turning roller 5;

[0037] A ruler 33 is provided next to the shear blade and on the other side of the second operating table for judging the length of the first shearing portion 121 ; the third operating table 93 is located on one side of the steel turning roller 5 and is used for transporting and turning the steel plate 12 .

[0038] Specifically: In this embodiment, a first operating platform 91, a second operating platform, and a third operating platform 93 are provided. The first operating platform 91 is located at the entrance of the ground roller 7, and is used to unwind the tail of the steel coil 11; the second operating platform is located on the side of the shear blade, and is used to rotate, shear, and transport the steel coil 11 to the steel turning roller 5. At the same time, a scale 33 is provided next to the shear blade and on the other side of the second operating platform, which is used to judge the length of the first shearing portion 121; the third operating platform 93 is located next to the steel turning roller 5 of the inspection line, and is used to transport and turn over the steel plate 12. Among them: the first operating platform 91 and the third operating platform 93 are prior art.

[0039] The present invention solves the problem that the high-strength steel coil 11 is too strong and difficult to unwind online, and also solves the problem that the steel plate 12 has high resilience after unwinding and is difficult to inspect during steel turning, thereby improving the efficiency of surface inspection of the steel coil 11 and the safety of steel turning operation, while reducing the failure rate.

[0040] Based on the same inventive concept, the present invention also provides a method for uncoiling a steel strip, the method for uncoiling a steel strip comprising the following steps:

[0041] Step 1: The target steel coil 11 is transported to the inspection line roller 7 by the coil transport trolley 8 for uncoiling inspection, the tail of the steel coil 11 is opened under the shear blade, the tail of the steel coil 11 is partially sheared, and the shear blade is lifted to form a first shearing portion 121;

[0042] Further, the target steel coil 11 has a thickness of ≤6 mm and a yield strength of 235 MPa < 600 MPa;

[0043] Further, 2 / 3 of the width of the steel coil 11 is transversely sheared, and the tail of the steel coil 11 is sheared by 0.4 to 0.6 m to form a first shearing portion 121;

[0044] Specifically: In the prior art, the steel coil 11 is transported to the ground roller 7 by the coil transport trolley 8, unrolled by the unwinder 2, and the ground roller 7 rotates to open the tail of the steel coil 11 under the shear blade. When the steel coil 11 is high-strength steel, taking the unrolled CR550 / 980DP tail as an example, its yield strength lower limit is 550Mpa. The part of the steel coil 11 opened from the tail has a high resilience and warps up, causing the tail to hit the straightening pinch roller 41 and unable to move forward. When the tail exceeds the shear blade by about 0.4-0.6m, the upper shear blade 31 descends and transversely shears the tail. The shear length is 2 / 3 of the width of the steel coil 11, forming the first shearing portion 121, and weakening the resilience of the tail steel plate 12. In addition, the first shearing portion 121 falls due to its own weight, weakening the upward tendency of the tail, so that the tail can be smoothly opened from the straightening pinch roller 41. In this embodiment, when the shear blade descends to shear, the shear blade shears from one end to the other end, so the shear blade can shear the steel plate 12 in a transverse direction. Of course, the shear blade in this embodiment is a prior art and is not required in this embodiment.

[0045] Step 2: Continue to unwind for a certain distance and partially shear the steel coil 11, repeating the process n times to form a second shearing portion 122;

[0046] Further, the coil is unwound for a certain distance, and the steel coil 11 is partially sheared, and the process is repeated n times, and a shear cut is formed after the steel coil 11 is sheared, and the shear cut forms the steel coil 11 into multiple sections, wherein a distance of one section is 800-1400 mm; wherein 2≤n≤5; and the n-time shearing is 1 / 2-2 / 3 of the width of the steel coil 11 which is sheared transversely;

[0047] Further, the length of the second shearing portion 122 is 4 to 5 meters; a distance is 5 to 5.5 meters;

[0048] Furthermore, the last shearing in the n times is 500 mm to 800 mm away from the tail of the steel plate 12; wherein the transverse shearing is 2 / 3 of the width of the steel coil 11;

[0049] Specifically: After the tail of the steel coil 11 leaves the straightening pinch roller 41 and continues to move forward, the tail of the steel coil 11 will also continue to warp up and hit the equipment above the straightening pinch roller 41, hindering the tail of the steel coil 11 from moving forward. If 5.5 meters of the tail of the steel coil 11 needs to be opened, the tail must be sheared every 800-1400mm, 2-5 times, and 1 / 2-2 / 3 of the width of the steel coil 11 must be sheared transversely. For example, 4 times are cut at intervals of 1.4 meters. In this way, the resilience of the middle part of the steel plate 12 is eliminated, so that the middle part of the steel plate 12 is no longer severely arched; the cutting point is 500mm away from the last shearing point, and 2 / 3 of the width of the steel coil 11 is sheared transversely to reduce the resilience of the tail of the steel plate 12, while forming a second shearing portion 122. In this way, the overall resilience of the steel plate 12 is reduced, and the head and tail of the steel plate 12 will not be severely warped;

[0050] Step 3: After the steel coil 11 is opened for a certain distance, the opened portion of the steel coil 11 is cut off to form a steel plate 12, and the steel plate 12 is inspected;

[0051] Furthermore, after the inspection of the lower surface of the steel plate 12 is completed, the steel plate 12 is flipped up more than 90 degrees laterally by the steel flipping arm 52 and dropped to the lifting point 61, and the steel plate 12 is turned over to inspect the upper surface; a limit portion 62 is provided on the lifting point 61 to position the steel plate 12.

[0052] Further, the bottom layer of steel plates 12 includes at least five steel plates 12; the thickness of the bottom layer of steel plates 12 is greater than or equal to 4.5 mm;

[0053] Specifically: Based on step one and step one and two, after the steel coil 11 is unrolled for 5.5 meters, the steel plate 12 is cut out and placed on the steel turning roller 5 for lower surface inspection. After the lower surface inspection is completed, the steel plate 12 needs to be turned up by the steel turning arm 52 by more than 90°, so that it falls to the hoisting point 61, and the upper surface of the steel plate 12 is inspected. In the prior art, two sets of steel turning arms 52 are used, one set of which is turned at an angle of about 100° for waiting, and the other set of which is turned at an angle of about 80° to hold up the steel plate 12. After the two sets of steel turning arms 52 simultaneously clamp the steel plate 12 and turn it up to the upper surface, the steel turning arms 52 fall down. In this embodiment, only one set of steel turning arms 52 with a flipping angle of more than 90° is used to flip up the steel plate 12, and the steel plate 12 is directly dropped on the lifting point 61. The operation is quick and easy, and the two sets of steel turning arms 52 are prevented from clamping and damaging the surface of the steel plate 12 and affecting the surface inspection, thereby reducing the maintenance and investment of the equipment. The lifting point 61 has a limiting portion 62, and the multiple steel plates 12 remain neat after the steel plate 12 is flipped. Based on steps one and two, the resilience of the steel plate 12 has been greatly weakened, which prevents the steel plate 12 from becoming seriously bowed during the flipping process and being unable to flip. In this embodiment, after the steel plate 12 is flipped, there will be multiple steel plates 12 at the lifting point 61. For the bottom of the multiple steel plates 12, at least five are not high-strength steel in this embodiment, which prevents the multiple steel plates 12 from rebounding severely at both ends during lifting and affecting the lifting. At the same time, the thickness of the bottom steel plate 12 is ≥4.5mm, which prevents the steel plates 12 from falling seriously at both ends during lifting when they are too thin.

[0054] The present invention solves the problem that the high-strength steel coil 11 is too strong and difficult to unwind online, and also solves the problem that the steel plate 12 has high resilience after unwinding and is difficult to inspect during steel turning, thereby improving the efficiency of surface inspection of the steel coil 11 and the safety of steel turning operation, while reducing the failure rate.

[0055] In the above embodiments, the description of each embodiment has its own emphasis. 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 as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0057] Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for technical personnel in this field, according to the idea of ​​the present 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 the present application.

Claims

1. A method for uncoiling a steel strip, based on a device for uncoiling a steel strip, the device for uncoiling a steel strip is applied to a hot rolling production line, the device comprises a coil transport trolley, a ground roller, an uncoiler, a shearing blade, a straightening pinch roller, a reverse pressure roller, a steel turning roller table, a steel turning arm and a hoisting point according to the running direction, the coil transport trolley is arranged between the ground rollers and is used to transport the steel coil, the steel coil is transported to the ground roller by the coil transport trolley, uncoiled by the uncoiler, the ground roller rotates, and the tail of the steel coil is opened under the shearing blade; the shearing blade comprises an upper shearing blade and a lower shearing blade, the shearing blade is used to shear the steel coil, and the steel coil is sheared to form a steel plate; the steel turning arm is arranged on the steel turning roller table and is used to turn the steel plate; The strip uncoiling device comprises a first operating platform, a second operating platform and a third operating platform. The first operating platform is located at the entrance of the ground roller and is used to uncoil the tail of the steel coil. The second operating platform is located on one side of the shear blade and is used to rotate and shear the steel coil and transport the steel plate to the steel turning roller. A ruler is provided beside the shear blade and on the other side of the second operating table for judging the length of the first shearing portion; the third operating table is located on one side of the steel turning roller and is used for transporting and turning the steel plates; it is characterized in that: The method for uncoiling a strip comprises the following steps: Step 1: The target steel coil is transported to the inspection line roller by the coil transport trolley for uncoiling inspection, and the tail of the steel coil is opened under the shear blade. After the tail of the steel coil is partially sheared, the shear blade is raised to form the first shearing part. When the tail exceeds the shear blade by 0.4-0.6m, the upper shear blade descends to transversely shear the tail, and the shearing length is 2 / 3 of the width of the steel coil; Step 2: Continue to unwind for a certain distance, partially shear the steel coil, and repeat the shearing for n times to form a second shearing portion, wherein the steel coil is sheared to form a shearing cut, and the shearing cut forms the steel coil into multiple sections, wherein a distance of one section is 800-1400 mm; 2≤n≤5; the n times of shearing is transverse shearing of 1 / 2-2 / 3 of the width of the steel coil; Step three: After the steel coil is opened for a certain distance, the opened portion of the steel coil is cut off to form a steel plate, and the steel plate is inspected, wherein the length of the second shearing portion is 4 to 5 meters; and the opening distance of the steel coil is 5 to 5.5 meters.

2. A method for uncoiling a steel strip according to claim 1, characterized in that: After the inspection of the lower surface of the steel plate is completed, the steel plate is flipped up more than 90 degrees laterally by the steel flipping arm and dropped to the lifting point, and the steel plate is turned over to inspect the upper surface; a limit part is provided on the lifting point to position the steel plate.

3. The method for uncoiling a steel strip according to claim 1, characterized in that: The bottom layer of steel plates includes at least five steel plates; the thickness of the bottom layer of steel plates is greater than or equal to 4.5 mm.

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