Method for improving detection accuracy of overflow of wide and thick plate walking beam furnace

Abstract

This invention discloses a method for improving the accuracy of overflow detection in a walking beam furnace for thick plates, relating to the field of metallurgical technology. The method includes: adjusting the lifting height of the tapping machine support arm so that it is 80-120mm higher than the roller conveyor surface; adjusting the position of the furnace laser detector so that the detection laser of another furnace laser detector is not obstructed after any tapping machine support arm lifts a billet with a thickness of 370mm and a length of 4500mm; adding an overflow alarm module to the control system to generate an alarm signal when the overflow detection value exceeds a threshold; controlling the billet feeding and detecting the overflow of the billet. This invention, by adjusting the lifting height of the tapping machine support arm and the position of the furnace laser detector, and adjusting the billet feeding method according to the billet size, avoids obstruction of the laser signal from the furnace laser detector, thereby effectively improving the accuracy of overflow detection calculation.

Description

Technical Field

[0001] This invention relates to the field of metallurgical technology, and in particular to a method for improving the accuracy of overflow detection in a thick plate walking beam furnace. Background Technology

[0002] When the billet reaches the tapping side of the furnace, it is positioned and the overflow amount is calculated using the furnace laser detector on the tapping side, which then completes the calculation of the tapping machine stroke. Tapping machine stroke = distance from the center line of the tapping roller conveyor to the laser detector + billet width / 2 - overflow amount + correction amount. Therefore, the accuracy of the overflow amount calculation determines the accuracy of the tapping machine stroke. However, under current technological conditions, the overflow amount calculations of the two tapping machines in the same heating furnace can interfere with each other. For example, when tapping from the first tapping machine of furnace 1, the billet being lifted by the tapping machine can block the furnace laser in the second tapping machine of furnace 1, leading to an error in the overflow amount calculation for the second tapping machine. This, in turn, results in an incorrect tapping stroke for the second tapping machine, causing the billet to not exit the center of the roller conveyor, but instead veering towards the furnace door. After the roller conveyor rotates, it may collide with the roller conveyor guard plate and tilt, or even be dragged and tilted during tapping, or even fall off. This not only affects the rolling rhythm and damages equipment, but also delays the adjustment of the billet position and can lead to insufficient billet temperature requiring reheating. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a method for improving the detection accuracy of overflow in a thick plate walking beam furnace.

[0004] To solve the above technical problems, the technical solution of the present invention is as follows:

[0005] A method for improving the detection accuracy of overflow in a walking beam furnace for thick plates includes:

[0006] Adjust the lifting height of the steel tapping machine support arm so that the steel tapping machine support arm is 80~120mm higher than the roller conveyor surface after being raised;

[0007] Adjust the position of the furnace laser detector so that the detection laser of the other furnace laser detector is not blocked after the billet with a thickness of 370mm and a length of 4500mm is lifted by the support arm of any tapping machine.

[0008] Add an overflow alarm module to the control system so that an alarm signal is generated when the overflow detection value exceeds the threshold.

[0009] Control the billet feeding and detect the overflow of the billet.

[0010] As a preferred embodiment of the method for improving the overflow detection accuracy of a thick plate walking beam furnace according to the present invention, wherein: generating an alarm signal when the overflow detection value exceeds a threshold includes:

[0011] An alarm signal is generated when the overflow detection value is greater than the step distance of the walking beam.

[0012] As a preferred embodiment of the method for improving the overflow detection accuracy of a thick plate walking beam furnace according to the present invention, wherein generating an alarm signal when the overflow detection value exceeds a threshold further includes:

[0013] An alarm signal is generated when the overflow detection value is 0.

[0014] As a preferred embodiment of the method for improving the overflow detection accuracy of a thick plate walking beam furnace according to the present invention, wherein generating an alarm signal when the overflow detection value exceeds a threshold further includes:

[0015] The overflow detection value does not match the calculated value of the furnace position data tracking system.

[0016] As a preferred embodiment of the method for improving the overflow detection accuracy of a wide and thick plate walking beam furnace according to the present invention, the billet feeding control includes: determining whether the billet thickness is less than or equal to 370 mm and the billet length is less than or equal to 4500 mm; if not, the billet feeding method is controlled as follows: after the current billet has finished tapping, another billet is controlled to enter the detection range of the laser detector in the furnace; if yes, the billet feeding method is controlled as normal feeding.

[0017] As a preferred embodiment of the method for improving the overflow detection accuracy of a wide and thick plate walking beam furnace according to the present invention, after controlling the billet feeding and detecting the overflow of the billet, the method further includes: if the overflow detection value does not exceed the threshold, then automatically tapping the steel; if the overflow detection value exceeds the threshold, then generating an alarm signal and manually adjusting the billet position to detect the overflow again.

[0018] As a preferred embodiment of the method for improving the overflow detection accuracy of a thick plate walking beam furnace according to the present invention, the control system includes a controller of model S7-400.

[0019] The beneficial effects of this invention are:

[0020] This invention adjusts the lifting height of the tapping machine support arm, the position of the furnace wall opening, and the position of the furnace laser detector. It also adjusts the billet feeding method according to the billet size, thus avoiding the obstruction of the laser signal of the furnace laser detector. This effectively improves the accuracy of overflow detection and calculation. Combined with the overflow alarm program, it ensures the accurate stroke of the tapping machine and prevents problems such as billet skewing, billet falling, damage to roller conveyor guards and descaling equipment during billet advance, and roller conveyor power tripping caused by incomplete tapping. This ensures the integrity of the equipment, reduces spare parts consumption costs and production downtime, and reduces production rework and unplanned production. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the steel tapping machine.

[0023] Figure 2 This is a flowchart illustrating the method for improving the overflow detection accuracy of a thick plate walking beam furnace provided by the present invention.

[0024] Figure 3 This is a schematic diagram of the detection principle of the in-furnace laser detector. Detailed Implementation

[0025] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0026] Figure 1 This is a schematic diagram of the steel tapping machine. According to... Figure 1 As shown, the stroke of the steel tapping machine from the starting position to the steel taking position is: The stroke of the tapping machine from the steel taking position to the center line of the tapping roller conveyor is: Where S1 is the distance from the laser detector to the center line of the furnace exit roller conveyor, S2 is the distance from the starting position of the tapping machine to the center line of the furnace exit roller conveyor, W is the billet width, m is the overflow amount, i.e., the distance from the front end of the billet to the laser detector, and C is the safe distance of the tapping machine end across the center line of the billet width.

[0027] Figure 2 This is a flowchart illustrating the method for improving the overflow detection accuracy of a walking beam furnace for thick plates, as provided in this application. The method specifically includes the following steps:

[0028] Step S101: Adjust the lifting height of the steel tapping machine support arm so that the steel tapping machine support arm is 80~120mm higher than the roller conveyor surface after being raised.

[0029] Specifically, based on the design specifications and the actual wear of the roller surface, while meeting the equipment operation requirements, the lifting height of the steel tapping machine support arm is reduced so that the steel tapping machine support arm is 80~120mm higher than the roller conveyor surface after being raised.

[0030] Step S102: Adjust the position of the furnace laser detector so that the detection laser of the other furnace laser detector is not blocked after the billet with a thickness of 370mm and a length of 4500mm is lifted by the support arm of any tapping machine.

[0031] Specifically, the position of the in-furnace laser detector was adjusted, and the opening was redesigned to adjust the detection range of the in-furnace laser. This ensures that after the adjustment, when any steel tapping machine arm lifts a billet with a thickness of 370mm and a length of 4500mm, the detection laser of the other in-furnace laser detector will not be blocked by the billet. Figure 3 This is a schematic diagram of the detection principle of the in-furnace laser detector.

[0032] Step S103: Add an overflow alarm module to the control system so that an alarm signal is generated when the overflow detection value exceeds the threshold.

[0033] Specifically, the overflow calculation program in the control system is optimized, and an overflow alarm module is added. This overflow alarm module can generate an alarm signal when the overflow detection value exceeds the threshold, reminding operators to make adjustments as soon as possible.

[0034] In this embodiment, the overflow detection value exceeding the threshold includes, but is not limited to, the following three situations:

[0035] a. The overflow detection value is greater than the step distance of the walking beam;

[0036] b. The overflow detection value is 0;

[0037] c. The overflow detection value does not match the calculated value of the furnace position data tracking system.

[0038] It's understandable that the detected overflow amount cannot exceed the step distance of the walking beam. Therefore, when the detected overflow amount is greater than the step distance, it indicates an error in the overflow detection. When the detected overflow amount is 0, it means that the front end of the billet is perfectly aligned with the vertical plane of the laser detector; this situation is generally unlikely. Therefore, if this occurs, it's still advisable to remind the operator to check, just to be safe. Furthermore, the overflow amount has two different sources: one is calculated from the furnace position data tracking, and the other is the displacement calculated by the laser detector based on the billet's movement after setting the initial conditions. When these two overflow amounts differ, an alarm signal will also be generated.

[0039] Step S104: Control the billet feeding and detect the overflow of the billet.

[0040] Specifically, according to the statistical data, after the modification, when the billet thickness does not exceed 370mm and the billet length does not exceed 4500mm, the laser detection signal in the furnace of the other stage will not be blocked after the billet is lifted by the support arm of the first tapping machine. This can effectively ensure that the billet detection of the first and second stages will not affect each other, and ensure that the overflow amount and tapping stroke are calculated accurately.

[0041] Therefore, when controlling billet feeding, it is necessary to determine whether the billet thickness is less than or equal to 370mm and the billet length is less than or equal to 4500mm. If not, the billet feeding method is as follows: after the current billet has finished tapping, control another billet to enter the detection range of its corresponding furnace laser detector, so as to avoid the detection signal of the other furnace laser detector being blocked, resulting in incorrect overflow detection. If yes, it means that the billet size is within the effective detection range, and the billet feeding method is normal feeding.

[0042] Step S105: If the overflow detection value does not exceed the threshold, the steel is automatically discharged; if the overflow detection value exceeds the threshold, an alarm signal is generated, the operator manually adjusts the billet position, and then performs overflow detection again until the overflow detection value does not exceed the threshold.

[0043] In this embodiment, the control system includes an S7-400 controller. Based on the statistical data, the S7-400 PLC control system is programmed with overflow calculation and alarm procedures to ensure timely and accurate overflow tracking and calculation, prompting alarms when overflow errors occur, and allowing parameter adjustments based on the mechanical characteristics and conditions of different walking beams and steel tapping machines.

[0044] Therefore, the technical solution of this application, by adjusting the lifting height of the tapping machine support arm and the position of the laser detector in the furnace, and adjusting the billet feeding method according to the billet size, avoids the laser signal of the laser detector in the furnace being blocked, thereby effectively improving the accuracy of overflow detection and calculation, thus ensuring the accurate stroke of the tapping machine, preventing the billet from being damaged by the roller guard plate and descaling equipment during the forward movement of the billet due to incomplete tapping, and causing the roller to trip, ensuring the integrity of the equipment, reducing spare parts consumption costs and production downtime.

[0045] In addition to the above embodiments, the present invention may have other implementation methods; all technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by the present invention.

Claims

1. A method for improving the detection accuracy of overflow in a walking beam furnace for thick plates, characterized in that: include: Adjust the lifting height of the steel tapping machine support arm so that the steel tapping machine support arm is 80~120mm higher than the roller conveyor surface after being raised; Adjust the position of the furnace laser detector so that the detection laser of the other furnace laser detector is not blocked after the billet with a thickness of 370mm and a length of 4500mm is lifted by the support arm of any tapping machine. Add an overflow alarm module to the control system so that an alarm signal is generated when the overflow detection value exceeds the threshold. Control the billet feeding and detect the overflow of the billet.

2. The method for improving the overflow detection accuracy of a thick plate walking beam furnace according to claim 1, characterized in that: The alarm signal generated when the overflow detection value exceeds the threshold includes: An alarm signal is generated when the overflow detection value is greater than the step distance of the walking beam.

3. The method for improving the overflow detection accuracy of a thick plate walking beam furnace according to claim 2, characterized in that: The alarm signal generated when the overflow detection value exceeds the threshold also includes: An alarm signal is generated when the overflow detection value is 0.

4. The method for improving the overflow detection accuracy of a thick plate walking beam furnace according to claim 2, characterized in that: The alarm signal generated when the overflow detection value exceeds the threshold also includes: The overflow detection value does not match the calculated value of the furnace position data tracking system.

5. The method for improving the overflow detection accuracy of a thick plate walking beam furnace according to claim 1, characterized in that: The controlled billet feeding includes: Determine if the billet thickness is less than or equal to 370mm and the billet length is less than or equal to 4500mm. If not, control the billet feeding method as follows: after the current billet is tapped, control another billet to enter the detection range of the laser detector in the furnace. If yes, control the billet feeding method as normal feeding.

6. The method for improving the overflow detection accuracy of a thick plate walking beam furnace according to claim 1, characterized in that: After controlling the billet feeding and detecting the overflow of the billet, the method further includes: If the overflow detection value does not exceed the threshold, the steel will be automatically discharged; if the overflow detection value exceeds the threshold, an alarm signal will be generated, and the billet position will be manually adjusted to detect the overflow again.

7. The method for improving the overflow detection accuracy of a thick plate walking beam furnace according to claim 1, characterized in that: The control system includes a controller of model S7-400.

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