A control method capable of stabilizing rolling of a threaded steel cut

Abstract

The application discloses a kind of control method capable of stable rolling slitting, is equipped with loop scanner on multiple channel slitting loop, the loop scanner is multiple lens scanner, the multiple lens scanner detects the fluctuation of all rolling piece loop height signal in multiple channel loop, the average of the fluctuation of each rolling piece loop height signal obtained is as the actual loop height of loop starting of loop height feedback to control system, control system is based on this loop height fluctuation information to adjust the loop height of each rolling piece formed loop, so that the loop height of each rolling piece formed after multiple channel loop starting is in stable condition.The finished product line difference obtained by the method provided by the application is reduced from more than 1.5% to below 0.5%, solving the problem of transverse rib height exceeding the standard.

Description

Technical Field

[0001] This invention relates to a control method for stable rolling and cutting. Background Technology

[0002] The primary function of a single-bar rolling mill is to cut rebar into multiple strands. This method involves rolling the workpiece through a cutting die, then using cutting guides to split the workpiece into multiple strands, thus enabling the simultaneous production of multiple finished rebar strands. However, the following problems exist in the production process:

[0003] To achieve tension-free rolling, two multi-channel cutting loopers were used in the subsequent rolling process after the rolled pieces were slit. The control method for the multi-channel cutting loopers is the same as that for single-channel ordinary loopers: the looper scanner detects the change signal in the loop height of a single rolled piece, and the control system automatically adjusts the loop height to achieve tension adjustment. The looper scanner is a single-lens scanner, such as... Figure 2 As shown, the section 1 through which the rolling mill passes via the slitting loop is also independent and enclosed. Therefore, the slitting loop scanner can only detect signal changes in the rolling piece closest to the scanner. During production, when the size of the rolling piece closest to the scanner is smaller than the sizes of other rolling pieces, the larger rolling piece will form a high loop in the slitting loop, causing a steel pile-up accident. Steel pile-up accidents caused by this reason can occur more than 30 times per month, resulting in more than 100 tons of scrap per month. Furthermore, the downtime caused by steel pile-up accidents can reach more than 2 hours per month.

[0004] To reduce the risk of steel piling up during the cutting and looping process, the measure taken is to ensure that the dimension of the rolled piece closest to the scanner is larger than that of the other rolled pieces. However, this method results in a line difference in the finished rebar (the line difference refers to the difference in weight between multiple finished products rolled after cutting a single rolled piece; it is generally expressed as a percentage of the difference between the weight of the heaviest 1-meter finished product rolled after cutting and rolling the lightest 1-meter finished product and the theoretical weight of the finished product). Currently, the line difference in production has reached over 1.5%, and the finished product rolled from the largest rolled piece after cutting often has a longitudinal rib height exceeding the national standard.

[0005] Furthermore, the width of the inlet guide plate, which serves as the guide for rolling, is more than 40mm wider than the width of the rolled piece. This causes the rolled piece to fail to enter the rolling mill along the predetermined path, resulting in a bend at the head of the rolled piece before it enters the cutting guide. This defect prevents the rolled piece from entering the cutting guide for cutting according to the predetermined trajectory, causing the cutting guide to overturn, resulting in a steel pile-up accident and production stoppage. The time to handle such an accident is at least 0.5 hours, and such accidents occur at least 5 times per month, resulting in rolling downtime of more than 2.5 hours. Summary of the Invention

[0006] The purpose of this invention is to provide a control method that can stably control rolling and cutting.

[0007] This invention provides a control method for stable rolling and cutting, which involves installing a looper scanner on a multi-channel cutting looper. The looper scanner is a multi-lens scanner that detects the height signal fluctuations of all rolled pieces in the multi-channel looper. The average value of the height signal fluctuations of each rolled piece is used as the actual looper height after looper startup and fed back to the control system. The control system adjusts the looper height formed by each rolled piece based on the received looper height fluctuation information, so that the looper height formed by each rolled piece after the multi-channel looper startup is in a stable state.

[0008] Furthermore, the rolling mill channel corresponding to the looper scanner installed in the multi-channel split looper has a connected structure, that is, the parts of two adjacent rolling mill channels at the corresponding looper scanner positions are interconnected, so that the looper scanner can simultaneously detect the changes in the high signal of all rolling mills in the looper.

[0009] Furthermore, by controlling the width of the inlet guide plate of the split guide to 5-15mm, the bending defect of the rolled piece after it bites into the rolling mill can be avoided, thus solving the problem of steel piling up in the top split guide caused by the defect.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] 1. The looper scanner of the present invention adopts a multi-lens scanner to simultaneously detect the changes in the high signal of all rolled pieces in the looper and realize multi-line output of the signal.

[0012] 2. This invention, without affecting the steel passage of the looper rolling mill, interconnects the corresponding looper scanner positions of two adjacent rolling mill channels, further enabling the looper scanner to simultaneously and accurately detect changes in the loop height signal of all rolling mills in the looper. During production, after the looper is lifted, the looper scanner can simultaneously detect the fluctuations in the loop height signal of all rolling mills in the multi-channel looper. Ultimately, the scanner automatically acquires the average value of the loop height signal fluctuations of each rolling mill as the actual loop height after the looper is lifted and feeds it back to the control system. The control system then adjusts the loop height of each rolling mill based on this loop height fluctuation information, ensuring a stable loop height after the multi-channel looper is lifted. This solves the steel accumulation problem caused by the multi-channel looper lifting height during split rolling. After splitting, it is no longer necessary to ensure that the rolling mill size near the multi-channel looper scanner is the largest. The dimensional difference of the finished products rolled from each rolling mill after splitting can be reduced to below 0.5%. The rolled products will also not have the problem of longitudinal rib height exceeding national standards.

[0013] 2. This invention controls the width of the inlet guide plate to always be maintained at 5-15mm, which can avoid the bending defect that occurs after the rolled piece bites into the rolling mill, and solve the problem of steel stacking in the top-cutting guide caused by the bending defect.

[0014] 3. The method provided by this invention solves the bottleneck problems of multi-channel looper lifting and top cutting guide steel stacking in rolling and slitting processes. It reduces downtime by 4.5 hours per month, and on average, 120.9 tons of finished product can be rolled per hour during rolling and slitting, with a profit of approximately 100 yuan per ton. Therefore, the annual benefit generated is: S = 4.5 hours * 120.9 tons / hour * 100 yuan / ton * 12 months = 652,900 yuan. In addition, it reduces scrap by approximately 100 tons per month. The price difference between finished product and scrap steel is 700 yuan, resulting in an annual benefit of: S = 100 tons / month * 12 months * 700 yuan / ton = 840,000 yuan. The estimated total direct benefit generated annually is: S = 652,900 + 840,000 = 1,492,900 yuan.

[0015] 4. The method provided by this invention reduces the finished product line difference from more than 1.5% to less than 0.5%, solving the problem of excessive transverse rib height, which also improves the brand value of new steel. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the multi-channel looper mechanism using a multi-lens scanner.

[0017] Figure 2 This is a schematic diagram of the structure of the rolling mill channel in the prior art.

[0018] Figure 3 This is a schematic diagram of the structure of the rolling mill channel of the present invention. Detailed Implementation

[0019] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. It should be noted that the embodiments described below are only one embodiment of the present invention, and not all embodiments. Based on the embodiments of the present invention, any modifications and improvements made to the technical solution of the present invention by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] A control method for stable rolling and cutting is proposed, in which a multi-lens scanner is installed as the looper scanner in a multi-channel cutting looper. For example... Figure 3As shown, the rolling mill channel 1 corresponding to the looper scanner installed in the multi-channel looper is a connected structure, meaning that the portions of two adjacent rolling mill channels 1 at the corresponding looper scanner positions are interconnected, allowing the looper scanner to simultaneously detect changes in the loop height signal of all rolling mills in the looper. The multi-lens scanner detects the fluctuations in the loop height signal of all rolling mills in the multi-channel looper, and feeds back the average value of the obtained loop height signal fluctuations of each rolling mill as the actual loop height after looper activation to the control system. The control system adjusts the loop height formed by each rolling mill based on this loop height fluctuation information, ensuring that the loop height formed by each rolling mill after the multi-channel looper activation is stable.

[0021] like Figure 1 As shown, after the looper is lifted, the scanner can simultaneously detect the height signal fluctuations of all rolled pieces in the multi-channel looper, such as... Figure 1 Points A and B shown are ultimately used by the scanner to automatically acquire the average value of the sleeve height signal fluctuation for each rolled piece, which is then fed back to the control system as the actual sleeve height at which the looper starts rolling. Figure 1 Point C is shown. By employing a multi-lens looper scanner, changes in the loop height signal of all rolled pieces within the looper can be detected simultaneously. The loop height signal is then output in multiple lines, and the average value of the automatically acquired loop height signal fluctuations for each rolled piece is fed back to the control system as the actual loop height after looper activation. The control system then adjusts the loop height of each rolled piece based on this loop height fluctuation information, ensuring a stable loop height after multi-channel looper activation. This solves the steel accumulation problem caused by multi-channel looper activation during split rolling. After splitting, it is no longer necessary to ensure that the rolled piece size near the multi-channel looper scanner is the largest. The dimensional difference of the finished products rolled from each rolled piece after splitting can be reduced to below 0.5%.

[0022] The width of the inlet guide plate of the cutting guide is controlled between 5 and 15 mm, so that the rolled piece will not have a bend defect after biting into the rolling mill. The rolled piece can enter the cutting guide according to the predetermined trajectory for cutting, avoiding the top cutting guide being overturned and causing steel pile-up accidents and production stoppages.

Claims

1. A control method for stable rolling and cutting, characterized by having a looper scanner on a multi-channel cutting looper, wherein... The scanner is a multi-lens scanner, which simultaneously detects the height signal fluctuations of all rolled pieces in the multi-channel looper. The average value of the height signal fluctuations of each rolled piece is used as the actual looper height after looper startup and fed back to the control system. The control system adjusts the looper height formed by each rolled piece based on the received looper height fluctuation information to ensure that the looper height formed by each rolled piece is stable after the multi-channel looper startup. The rolled piece channel corresponding to the looper scanner in the multi-channel cutting looper has a connected structure, that is, two adjacent rolled piece channels are interconnected at the corresponding looper scanner positions, so that the multi-lens scanner can synchronously detect the rolled pieces in each channel through the connected area. The width of the inlet guide plate of the cutting guide is controlled between 5 and 15 mm.

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