Control method and system for preventing rolled piece head from becoming flat

Abstract

The invention discloses a control method for preventing the head of a rolled piece from being flattened, relates to the technical field of steel production, and solves the technical problems of steel heaping and equipment failure caused by the existing technology for treating the head of round steel from being flattened. The method comprises the steps that after a steel biting signal is received, the real-time speed of a rolled piece and the steel biting speed of a finishing mill frame are obtained, a prompt drop value is obtained according to the real-time speed of the rolled piece and the steel biting speed of the finishing mill frame, the prompt drop value is compared with a preset prompt drop threshold value, and when the prompt drop value is larger than the prompt drop threshold value, the finishing mill frame is started. And carrying out prompt drop alarm and triggering a first correction mechanism. The invention further discloses a control system for preventing the head of the rolled piece from becoming flat. Intelligent correction control over the rolling speed is achieved, the risk that the head of the rolled piece collides with a steel biting part of a finishing mill frame is reduced, and flattening and waste shearing of the head of the rolled piece are prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of steel production, and more particularly to a control method and system for preventing the head of a rolled piece from becoming flat. Background Art

[0002] When rolling round steel bars in steel mills, the head of the bar often becomes flat. The finished round steel can only be cut off and scrapped, and the rolling needs to be repeatedly stopped, adjusted and processed during the rolling process. This situation will lead to a significant reduction in the yield rate on the one hand, and discontinuous production on the other hand, which will seriously reduce the output. The existing technology mainly performs a series of process operations and on-site adjustments after the head of the round steel becomes flat. However, the existing technology has no directionality on the one hand and no system on the other hand, which leads to an insignificant adjustment effect, resulting in a very long production interruption time. Therefore, the existing technology has great disadvantages and defects, which are specifically manifested in the following aspects. First, a series of process operations and on-site adjustments after the head becomes flat will lead to repeated fluctuations in the production process, and the effect is unstable, which will cause serious fluctuations in the quality of the finished product, and ultimately lead to a reduction in product quality. Then, a series of process operations and on-site adjustments after the head becomes flat will lead to deviations and fluctuations in the parameters and variables associated with it, which will lead to steel piling and equipment failure, which will lead to a long interruption of production, which will lead to a reduction in output and an increase in the comprehensive energy consumption per ton of steel. Finally, a series of process operations and on-site adjustments are carried out after the head becomes flattened. Since production rolling is in progress at the production site, the above operations not only have poor effects, but also greatly increase the safety risks of on-site process personnel and equipment inspection and maintenance personnel, which in turn greatly reduces the safety and controllability of the production process and equipment inspection and maintenance process. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a control method and system for preventing the head of a rolled piece from becoming flat, in view of the deficiencies in the prior art, so as to solve the technical problem that the prior art for processing the flattening of the head of round steel may cause steel piling and equipment failure.

[0004] The present invention provides a control method for preventing the head of a rolled piece from becoming flat. The method comprises:

[0005] After receiving the steel biting signal, the real-time speed of the rolled piece and the steel biting speed of the finishing mill are obtained, a speed drop value is obtained according to the real-time speed of the rolled piece and the steel biting speed of the finishing mill, the speed drop value is compared with a preset speed drop threshold, and when the speed drop value is greater than the speed drop threshold, a speed drop alarm is issued and a first correction mechanism is triggered;

[0006] Acquire the real-time height of the rolled piece on the rolling mill, and obtain the real-time excess height of the rolled piece by subtracting the real-time height value from the preset height limit value; when the real-time excess height of the rolled piece is greater than the preset height excess limit value, issue a rolled piece height alarm and trigger a second correction mechanism;

[0007] The real-time tension value of the rolled piece is obtained, and when the real-time tension value of the rolled piece is greater than a preset tension threshold, a rolled piece tension alarm is issued and a third correction mechanism is triggered.

[0008] As a further improvement, the expression for obtaining the rapid drop value is:

[0009]

[0010] Among them, V0 is the real-time speed of the rolled piece, V1 is the steel biting speed of the finishing mill, V2 is the speed drop value, and a is the speed coefficient.

[0011] Furthermore, the first correction mechanism is to obtain a speed drop correction value by subtracting the speed drop value from the speed drop threshold, obtain a correction speed of the rolled piece by subtracting the real-time speed of the rolled piece from the speed drop correction value, and set the correction speed of the rolled piece as the real-time speed of the rolled piece.

[0012] Furthermore, the second correction mechanism is to increase the gap between the rollers to reduce the real-time height of the workpiece on the rolling mill, so that the real-time excess height of the workpiece is less than a preset height excess limit.

[0013] Furthermore, the third correction mechanism is to reduce the real-time speed of the rolled piece to reduce the real-time tension value of the rolled piece, so that the real-time tension value of the rolled piece is less than the tension threshold value.

[0014] A control system for preventing a rolled piece head from becoming flat, the system comprising:

[0015] A first speed sensor, used for collecting the speed of the rolled piece and outputting a speed signal of the rolled piece;

[0016] A second speed sensor is used to collect the steel biting speed of the finishing mill stand and output a steel biting speed signal of the rolled piece;

[0017] A height sensor, used for collecting the height of the rolled piece on the rolling mill and outputting a height signal of the rolled piece;

[0018] A tension sensor, used for collecting the tension value of the rolled piece and outputting the tension signal;

[0019] A controller, used for receiving a speed signal of the rolled piece, a steel biting speed signal of the rolled piece, a height signal of the rolled piece, and a tension signal;

[0020] The controller uses the above-mentioned control method for preventing the head of the rolled piece from becoming flat to control the rolling mill through speed signals, the steel biting speed signals of the rolled piece, the height signals of the rolled piece and the tension signals to prevent the head of the rolled piece from becoming flat.

[0021] Beneficial Effects

[0022] The advantages of the present invention are:

[0023] 1. The present invention obtains the real-time speed of the rolled piece and the steel-biting speed of the finishing mill, obtains the speed drop value according to the real-time speed of the rolled piece and the steel-biting speed of the finishing mill, issues an alarm according to the abnormal speed drop value and triggers the first correction mechanism, thereby realizing intelligent correction control of the rolling speed, reducing the risk of the rolled piece head colliding with the steel-biting parts of the finishing mill, and preventing the rolled piece head from becoming flat and shearing waste.

[0024] 2. The present invention obtains the real-time height of the workpiece on the rolling mill, issues a workpiece height alarm for abnormal real-time height and triggers a second correction mechanism, thereby achieving optimal control over the height adjustment of the workpiece head and preventing the head of the workpiece from becoming flat during rolling due to the workpiece being located too high on the rolling mill.

[0025] 3. The present invention obtains the real-time tension value of the rolled piece, issues an alarm for abnormal real-time tension value and triggers the third correction mechanism to achieve correction control of the tension, thereby avoiding the flattening of the rolled piece head due to excessive tension of the rolled piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The present invention is a flow chart of a control method for preventing the head of a rolled piece from becoming flat. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the embodiments, but it does not constitute any limitation to the present invention. Any limited number of modifications made by anyone within the scope of the claims of the present invention are still within the scope of the claims of the present invention.

[0028] See also Figure 1 The present invention provides a control method for preventing the head of a rolled piece from becoming flat. The method comprises:

[0029] When the steel biting signal is received, the real-time speed of the rolled piece and the steel biting speed of the finishing mill are obtained, and the speed drop value is obtained according to the real-time speed of the rolled piece and the steel biting speed of the finishing mill. The speed drop value is compared with the preset speed drop threshold. When the speed drop value is greater than the speed drop threshold, a speed drop alarm is issued and the first correction mechanism is triggered.

[0030] The expression for obtaining the rapid drop value is:

[0031]

[0032] Among them, V0 is the real-time speed of the rolled piece, V1 is the steel biting speed of the finishing mill, V2 is the speed drop value, and a is the speed coefficient.

[0033] The first correction mechanism is to obtain the speed drop correction value by subtracting the speed drop value from the speed drop threshold, obtain the correction speed of the rolled piece by subtracting the real-time speed of the rolled piece from the speed drop correction value, and set the correction speed of the rolled piece to the real-time speed of the rolled piece. This realizes intelligent correction control of the rolling speed, reduces the risk of the rolled piece head colliding with the finishing mill stand biting the steel parts, and prevents the rolled piece head from becoming flat and shearing waste.

[0034] The real-time height of the workpiece on the rolling mill is obtained, and the real-time excess height of the workpiece is obtained by subtracting the real-time height value from the preset height limit. When the real-time excess height of the workpiece is greater than the preset height excess limit, a workpiece height alarm is issued and the second correction mechanism is triggered.

[0035] The second correction mechanism is to increase the gap between the rolls to reduce the real-time height of the rolled piece on the rolling mill, so that the real-time margin height of the rolled piece is less than the preset height margin limit. This achieves optimal control of the height adjustment of the rolled piece head and prevents the head of the rolled piece from becoming flat during rolling due to the excessive height of the rolled piece on the rolling mill.

[0036] The real-time tension value of the rolled piece is obtained. When the real-time tension value of the rolled piece is greater than a preset tension threshold, a rolled piece tension alarm is issued and a third correction mechanism is triggered.

[0037] The third correction mechanism is to reduce the real-time speed of the rolled piece to reduce the real-time tension value of the rolled piece, so that the real-time tension value of the rolled piece is less than the tension threshold value, so as to realize the correction control of the tension and avoid the situation where the rolled piece head becomes flat and is sheared to waste due to excessive tension of the rolled piece.

[0038] A control system for preventing a rolled piece head from becoming flat, the system comprising:

[0039] The first speed sensor is used to collect the speed of the rolled piece and output a speed signal of the rolled piece.

[0040] The second speed sensor is used to collect the steel biting speed of the finishing mill stand and output the steel biting speed signal of the rolled piece.

[0041] The height sensor is used to collect the height of the rolled piece on the rolling mill and output the height signal of the rolled piece.

[0042] The tension sensor is used to collect the tension value of the rolled piece and output a tension signal.

[0043] The controller is used for receiving the speed signal of the rolled piece, the steel biting speed signal of the rolled piece, the height signal and the tension signal of the rolled piece.

[0044] The controller uses the above-mentioned control method for preventing the head of the rolled piece from becoming flat to control the rolling mill through speed signals, the steel biting speed signals of the rolled piece, the height signals of the rolled piece and the tension signals to prevent the head of the rolled piece from becoming flat.

[0045] The system is equipped with a first speed sensor, a second speed sensor, a height sensor, a tension sensor and a controller to realize intelligent correction control of the rolling speed, reduce the risk of the head of the rolled piece colliding with the steel parts of the finishing mill frame, and prevent the head of the rolled piece from becoming flat. It realizes the optimal control of the height adjustment of the head of the rolled piece to prevent the head of the rolled piece from becoming flat during rolling due to the height of the rolled piece on the rolling mill being too high. It realizes the correction control of the tension to avoid the head of the rolled piece from becoming flat due to excessive tension of the rolled piece.

[0046] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A control method for preventing the head of a rolled piece from becoming flat, characterized in that: The method is, After receiving the steel biting signal, the real-time speed of the rolled piece and the steel biting speed of the finishing mill are obtained, a speed drop value is obtained according to the real-time speed of the rolled piece and the steel biting speed of the finishing mill, the speed drop value is compared with a preset speed drop threshold, and when the speed drop value is greater than the speed drop threshold, a speed drop alarm is issued and a first correction mechanism is triggered; Acquire the real-time height of the rolled piece on the rolling mill, and obtain the real-time excess height of the rolled piece by subtracting the real-time height value from the preset height limit value; when the real-time excess height of the rolled piece is greater than the preset height excess limit value, issue a rolled piece height alarm and trigger a second correction mechanism; The real-time tension value of the rolled piece is obtained, and when the real-time tension value of the rolled piece is greater than a preset tension threshold, a rolled piece tension alarm is issued and a third correction mechanism is triggered.

2. A control method for preventing the head of a rolled piece from flattening according to claim 1, characterized in that: The expression for obtaining the speed drop value is: Among them, V0 is the real-time speed of the rolled piece, V1 is the steel biting speed of the finishing mill, V2 is the speed drop value, and a is the speed coefficient.

3. A control method for preventing the head of a rolled piece from flattening according to claim 2, characterized in that: The first correction mechanism is to obtain a speed drop correction value by subtracting the speed drop value from the speed drop threshold, obtain a correction speed of the rolled piece by subtracting the real-time speed of the rolled piece from the speed drop correction value, and set the correction speed of the rolled piece as the real-time speed of the rolled piece.

4. A control method for preventing the head of a rolled piece from flattening according to claim 1, characterized in that: The second correction mechanism is to increase the gap between the rollers to reduce the real-time height of the rolled piece on the rolling mill, so that the real-time excess height of the rolled piece is less than a preset height excess limit.

5. A control method for preventing the head of a rolled piece from flattening according to claim 1, characterized in that: The third correction mechanism is to reduce the real-time speed of the rolled piece to reduce the real-time tension value of the rolled piece, so that the real-time tension value of the rolled piece is less than the tension threshold value.

6. A control system for preventing the head of a rolled piece from flattening, characterized in that: The system includes: A first speed sensor, used for collecting the speed of the rolled piece and outputting a speed signal of the rolled piece; A second speed sensor is used to collect the steel biting speed of the finishing mill stand and output a steel biting speed signal of the rolled piece; A height sensor, used for collecting the height of the rolled piece on the rolling mill and outputting a height signal of the rolled piece; A tension sensor, used for collecting the tension value of the rolled piece and outputting the tension signal; A controller, used for receiving a speed signal of the rolled piece, a steel biting speed signal of the rolled piece, a height signal of the rolled piece, and a tension signal; The controller applies a control method for preventing the head of the rolled piece from flattening as described in any one of claims 1 to 5 to control the rolling mill through speed signals, the steel biting speed signals of the rolled piece, the height signals of the rolled piece and the tension signals to prevent the head of the rolled piece from flattening.

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