A control method and system for preventing the offset of a double-high-line water tank rolled piece

Abstract

The application discloses a control method for preventing double-high-line water tank rolled piece shaking deviation, relates to the control technology of steel rolling production, and sets a middle section pinch roll assembly in a middle section water tank; collects the current vibration amplitude of the rolled piece in the middle section water tank, determines the middle section transmission speed of the middle section pinch roll assembly according to the current vibration amplitude and the wire feeding transmission speed of the wire feeding pinch roll assembly, and links the transmission speed of the middle section pinch roll assembly with the transmission speed of a finishing rolling unit, so that the finishing rolling transmission speed of the finishing rolling unit is consistent with the middle section transmission speed of the middle section pinch roll assembly. The application also discloses a control system for preventing double-high-line water tank rolled piece shaking deviation. The application greatly reduces the shaking of the rolled piece in the middle section water tank, prevents the collision between the rolled pieces, and improves the stability of the transmission of the rolled piece in the water tank.

Description

Technical Field

[0001] This invention relates to control technology in steel rolling production, and more specifically, to a control method and system for preventing the wobbling and deviation of rolled pieces in a double-high wire rod water tank. Background Technology

[0002] In a steel rolling mill's double-high-speed wire rod finishing mill, there are four water tanks after the finishing stand. The rolled stock inside these tanks is impacted by the cooling water, causing it to vibrate or collide with each other. Currently, the rolled stock is clamped at the end of the water tanks (i.e., the rear water tanks) and at the front of the wire rod feeder using end-feeding and wire-feeding components to reduce vibration and collisions. However, because the four water tanks and the connecting guide channels between them are quite long, vibration and collisions of the rolled stock located in the middle of the tanks are still very noticeable. This vibration and collision can easily lead to steel accumulation in the water tanks. Therefore, the existing technology has significant drawbacks and defects, failing to ensure both finished product quality control and stable rolling and conveying processes. The specific hazards are mainly manifested in the following aspects.

[0003] First, vibrations or collisions of the rolled piece in the intermediate water tank can cause it to slosh and pile up, leading to production interruptions and a significant increase in cost per ton of steel. Second, the clamping assembly at the end of the water tank and the front of the wire rod mill cannot ensure a perfect match between the intermediate water tank guide chute and the rolled piece, resulting in rapid wear of the guide chute and making it easy for the rolled piece to pile up during passage. This rapid damage to the guide chute also increases the cost of spare parts, further increasing the cost per ton of steel production. Third, the excessive distance between the end clamping assembly and the finishing mill causes significant lag in speed transmission and tension control, leading to deviations in quality control due to control transmission errors, thus posing a significant risk to the entire quality control process. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a control method and system for preventing the shaking and deviation of rolled pieces in a double-high-speed water tank, thereby reducing the phenomenon of rolling piece shaking.

[0005] The present invention discloses a control method for preventing the vibration and deviation of rolled pieces in a double-high-speed wire rod water tank. A mid-section clamping assembly is installed in the mid-section water tank. The current vibration amplitude of the rolled piece in the mid-section water tank is collected. The mid-section conveying speed of the mid-section clamping assembly is determined based on the current vibration amplitude and the wire feeding conveying speed of the clamping assembly. The mid-section clamping assembly is then linked with the conveying speed of the finishing mill to ensure that the finishing mill conveying speed matches the mid-section conveying speed of the clamping assembly.

[0006] As a further improvement, the mid-section conveying speed is determined by the following method: Set a target amplitude threshold; If the current vibration amplitude is less than or equal to the target amplitude threshold, then the mid-section conveying speed is equal to the silk-spinning conveying speed; If the current vibration amplitude is greater than the target amplitude threshold but less than twice the target amplitude threshold, then the mid-section transmission speed... ; In the formula, v1 is the mid-section conveying speed; v0 is the silk-spinning conveying speed; f0 is the target amplitude threshold; f t This represents the current vibration amplitude. If the current vibration amplitude is greater than twice the target amplitude threshold, the water flow rate in the water tank is reduced by the set water volume reduction threshold until the current vibration amplitude is 1.5 times the target amplitude threshold.

[0007] Furthermore, the water volume reduction threshold is set by the following formula: ; In the formula, ΔV is the threshold for water volume reduction; V t This represents the current water level in the water tank.

[0008] Furthermore, when the water flow rate of the water tank decreases to 1.5 times the target amplitude threshold, the real-time water temperature at the outlet of the water tank is monitored in real time; when the real-time water temperature is greater than the set maximum water temperature threshold, the water inflow into the water tank is increased by a preset water volume increase threshold.

[0009] Furthermore, the water volume increase threshold is 1%-3% of the current water volume entering the water tank.

[0010] As a further improvement, the spinning speed of the spinning and feeding assembly is consistent with the end-conveying speed of the end-conveying assembly.

[0011] A control system for preventing the rolling mill from shaking and shifting in a double-high-speed wire rod water tank includes a controller, a finishing mill, a wire feeding and clamping assembly, and an intermediate clamping assembly and an end clamping assembly installed in the water tank; the controller uses the control method described above to control the finishing mill, the wire feeding and clamping assembly, the intermediate clamping assembly, and the end clamping assembly to convey the rolling mill.

[0012] As a further improvement, the structure of the middle section clamping assembly is consistent with the structure of the end clamping assembly.

[0013] Beneficial effects The advantages of this invention are as follows: a mid-section clamping assembly is set in the mid-section water tank, and the conveying speed of the mid-section clamping assembly is determined by the vibration amplitude of the rolled piece and the conveying speed of the wire feeding clamping assembly. The rolled piece is tightened by the speed difference between the clamping assemblies, thereby reducing the phenomenon of rolled piece vibration, preventing collisions between rolled pieces, and improving the stability of the rolled piece conveying in the water tank. Detailed Implementation

[0014] The present invention will be further described below with reference to embodiments, but this does not constitute any limitation on the present invention. Any limited modifications made by any person within the scope of the claims of the present invention are still within the scope of the claims of the present invention. This invention discloses a control method for preventing the jitter and deviation of rolled pieces in a double-high-speed wire rod water tank. A mid-section clamping assembly is installed in the mid-section water tank. This assembly clamps and conveys the rolled pieces within the mid-section water tank, significantly reducing jitter and preventing collisions between pieces, thereby improving the stability of the rolled pieces during transport within the water tank. To further reduce jitter, this embodiment achieves this through the following method.

[0015] The current vibration amplitude of the rolled piece in the intermediate water tank is collected, and the intermediate conveying speed of the intermediate conveying assembly is determined based on the current vibration amplitude and the wire feeding speed of the wire feeding assembly. Specifically, the intermediate conveying speed is determined by the following method.

[0016] First, set a target amplitude threshold. If the current vibration amplitude is less than or equal to the target amplitude threshold, it means that the vibration amplitude of the rolled piece is within the ideal range, and the vibration has little impact on the normal conveying of the rolled piece. Therefore, the intermediate conveying speed is set to be equal to the wire feeding conveying speed.

[0017] If the current vibration amplitude is greater than the target amplitude threshold but less than twice the target amplitude threshold, then the mid-section transmission speed... In the formula, v1 is the mid-section conveying speed; v0 is the silk-spinning conveying speed; f0 is the target amplitude threshold; f t The current vibration amplitude is given by the formula above. It can be seen that when the current vibration amplitude of the rolled piece is within twice the target amplitude threshold, the intermediate conveying speed is lower than the wire feeding conveying speed. The speed difference between the clamping components is used to further tighten the rolled piece, thereby reducing the phenomenon of rolled piece vibration.

[0018] If the current vibration amplitude is greater than twice the target amplitude threshold, it indicates that the vibration amplitude of the rolled piece is already large. Since the rolled piece has certain tensile properties, if the speed difference between the clamping components is too large, it can easily lead to deformation of the rolled piece, resulting in defective pieces. Therefore, this embodiment reduces the vibration amplitude of the rolled piece by controlling the water flow rate in the water tank. Specifically, the water flow rate in the water tank is reduced according to a set water flow reduction threshold until the current vibration amplitude is 1.5 times the target amplitude threshold. Setting the current vibration amplitude of the rolled piece to 1.5 times the target amplitude threshold, i.e., stopping the water flow rate reduction, aims to avoid insufficient water flow in the water tank, which would lead to poor cooling of the rolled piece. Thus, by combining the control of the intermediate conveyor speed and the water flow rate, the vibration phenomenon of the rolled piece can be further reduced while ensuring the stability of the rolled piece conveying and the quality of the rolled piece are not affected.

[0019] In this embodiment, the water volume reduction threshold is set by the following formula: .

[0020] In the formula, ΔV is the threshold for water volume reduction; V t This represents the current water level in the water tank.

[0021] As shown by the formula, when the current vibration amplitude of the rolled piece decreases, its water reduction threshold also decreases. By linking the water reduction threshold with the current vibration amplitude, the water inlet of the tank can be prevented from decreasing too quickly, thus affecting the cooling effect of the rolled piece.

[0022] Furthermore, to achieve closed-loop control of the water tank flow rate, this embodiment monitors the real-time water temperature at the water tank outlet when the water flow rate decreases to 1.5 times the target amplitude threshold. When the real-time water temperature exceeds the set maximum water temperature threshold, the threshold is increased by a preset amount of water, such as 2% of the current water inflow, until the real-time water temperature is equal to or lower than the set maximum water temperature threshold, thus ensuring the cooling effect of the rolled piece.

[0023] Regarding the conveying speeds of the finishing mill and the end-feeding assembly, this embodiment links the conveying speeds of the intermediate-section feeding assembly and the finishing mill to ensure that the finishing mill's conveying speed matches the intermediate-section feeding speed of the intermediate-section feeding assembly; and that the wire feeding speed of the wire feeding assembly matches the end-feeding speed of the end-feeding assembly. By designing a four-in-one speed matching and connection control system based on the finishing mill, intermediate-section feeding assembly, end-feeding assembly, and wire feeding assembly, optimal speed matching control between the components is achieved, resulting in stable conveying of the rolled workpiece.

[0024] A control system for preventing workpiece vibration and deviation in a double-high-speed wire rod mill water tank includes a controller, a finishing mill unit, a wire feeding and conveying assembly, and intermediate and end feeding and conveying assemblies installed in the water tank. The intermediate feeding and conveying assembly has the same structure as the end feeding and conveying assembly. The controller uses the aforementioned control method to control the finishing mill unit, the wire feeding and conveying assembly, the intermediate feeding and conveying assembly, and the end feeding and conveying assembly to convey the workpiece, thereby significantly reducing the vibration of the workpiece in the intermediate water tank, preventing collisions between workpieces, and improving the stability of workpiece conveying within the water tank.

[0025] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention, and these will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. A control method for preventing the jitter and deviation of rolled pieces in a double-high-speed wire rod water tank, characterized in that, An intermediate clamping assembly is installed in the intermediate water tank; the current vibration amplitude of the rolled piece in the intermediate water tank is collected, and the intermediate conveying speed of the intermediate clamping assembly is determined based on the current vibration amplitude and the wire feeding conveying speed of the wire feeding assembly; and the intermediate clamping assembly is linked with the conveying speed of the finishing mill so that the finishing mill conveying speed is consistent with the intermediate conveying speed of the intermediate clamping assembly. The intermediate transmission speed is determined by the following method: Set a target amplitude threshold; If the current vibration amplitude is less than or equal to the target amplitude threshold, then the mid-section conveying speed is equal to the silk-spinning conveying speed; If the current vibration amplitude is greater than the target amplitude threshold but less than twice the target amplitude threshold, then the mid-section transmission speed... ; In the formula, v1 is the middle section conveying speed; v0 is the yarn delivery conveying speed; f0 is the target amplitude threshold; f t is the current vibration amplitude. If the current vibration amplitude is greater than twice the target amplitude threshold, the water flow rate of the water tank is reduced by a set water volume reduction threshold until the current vibration amplitude is 1.5 times the target amplitude threshold. When the water flow rate of the water tank is reduced to 1.5 times the target amplitude threshold, the real-time water temperature at the outlet of the water tank is monitored in real time. When the real-time water temperature is greater than the set maximum water temperature threshold, the water inlet of the water tank is increased by a preset water volume increase threshold. The water volume reduction threshold is set by the following formula: ； In the formula, ΔV is the threshold for water volume reduction; V t This represents the current water level in the water tank.

2. The control method for preventing the jitter and deviation of double-high wire rod water tank rolled pieces according to claim 1, characterized in that, The threshold for increasing water volume is 1%-3% of the current water volume entering the water tank.

3. The control method for preventing the jitter and deviation of double-high wire rod water tank rolled pieces according to claim 1, characterized in that, The silk feeding speed of the silk feeding assembly is the same as the end conveying speed of the end conveying assembly.

4. A control system for preventing the jitter and displacement of rolled pieces in a double-high wire rod water tank, characterized in that, It includes a controller, a finishing mill, a wire feeding and clamping assembly, and an intermediate clamping assembly and an end clamping assembly installed in a water tank; the controller uses the control method described in any one of claims 1-3 to control the finishing mill, the wire feeding and clamping assembly, the intermediate clamping assembly, and the end clamping assembly to convey the rolled piece.

5. A control system for preventing the jitter and displacement of rolled pieces in a double-high wire rod water tank according to claim 4, characterized in that, The structure of the middle section clamping assembly is the same as that of the end clamping assembly.

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