Method for preventing equipment damage caused by abnormal ply rolling of hot finishing mill

Abstract

The invention belongs to the field of rolling, and relates to a method for preventing equipment damage caused by abnormal ply rolling of a hot finishing mill. The defects in the prior art in the aspect of steel coil tail anomaly detection and protection are effectively overcome, and the safety of a production line and the equipment protection capacity are improved. A pressure sensor is installed on a pinch roll of a hot coil box and used for monitoring the pressure change of the pinch roll during operation, and the pressure sensor uploads a pressure signal to a microprocessor; rotating sensors are arranged on the two sides of the split pin and used for monitoring the rotating angle of the split pin; the rotation sensor uploads a rotation angle signal to the microprocessor; a controller of the hot coil box is electrically connected with a microprocessor, the controller issues action signals to a split pin and the microprocessor at the same time, and when the microprocessor collects and receives the action signals and an obtained rotation angle signal is zero, it is judged that double folds exist at the tail of a steel coil; or if the pressure signal collected by the pressure sensor exceeds the pressure threshold value, it is judged that double folds exist at the tail of the steel coil.

Description

Technical Field

[0001] The present invention belongs to the rolling field and relates to a method for preventing equipment damage caused by abnormal overlapping rolling of a hot rolling finishing mill. Background Art

[0002] The basic process of a hot continuous rolling production line: The hot continuous rolling production line mainly consists of equipment such as a roughing mill, a hot coil box, an uncoiler, and a finishing mill. The steel billet is processed into a strip steel with a specific thickness and specification through multiple rolling and coiling processes. After rough rolling, the steel billet enters the hot coil box for coiling to form a steel coil, then enters the uncoiler for uncoiling, and then enters the finishing mill for further rolling.

[0003] During the coiling and uncoiling processes of the steel coil, the management of the tail of the steel coil is a key link. Especially in terms of the insertion and stability control of the tail-opening pin at the tail of the steel coil, if the operation is improper or the equipment fails, it will cause the double-fold phenomenon at the tail of the steel coil, thus affecting the stability of the subsequent rolling process and even damaging the rolling equipment.

[0004] Reasons for the double-fold problem at the tail of the steel coil: Mechanical system failure of the tail-opening pin: During the operation of the hot coil box, inserting the tail-opening pin into the coil core is an important step to ensure the normal uncoiling of the steel coil. Due to mechanical equipment failures (such as the tail-opening pin failing to be inserted in time or with a lag), the double-fold phenomenon will occur at the tail of the steel coil.

[0005] Hydraulic system failure: The tail-opening pin of the hot coil box relies on the hydraulic system for operation. If the hydraulic system fails (such as unstable pressure or system leakage), it may cause the action of the tail-opening pin to be untimely or the position to be inaccurate.

[0006] Tracking calculation error: During the operation of the steel coil, the system controls the insertion of the tail-opening pin by calculating the running direction of the steel coil. If the calculation model of the system is incorrect or the tracking is inaccurate, it may cause the tail of the steel coil to fail to follow correctly, resulting in the double-fold phenomenon. Summary of the Invention

[0007] To overcome the defects in the above-mentioned related technologies, the present invention proposes a method for preventing equipment damage caused by abnormal overlapping rolling of a hot rolling finishing mill, effectively making up for the deficiencies of the existing technology in the abnormal detection and protection of the tail of the steel coil, and improving the safety of the production line and the equipment protection ability.

[0008] A method for preventing equipment damage caused by abnormal overlapping rolling of a hot rolling finishing mill includes: Install a pressure sensor on the pinch roll of the hot coil box to monitor the pressure change during the operation of the pinch roll, and the pressure sensor uploads the pressure signal to the microprocessor; Rotary sensors are arranged on both sides of the split pin, and the rotary sensors are used to monitor the rotation angle of the split pin; the rotary sensors upload the rotation angle signals to the microprocessor; The controller of the hot coil box is electrically connected to the microprocessor, and the controller simultaneously sends action signals to the split pin and the microprocessor, When the microprocessor collects and receives the action signal and the obtained rotation angle signal is zero, it is determined that there is a double fold at the tail of the steel coil; Alternatively, if the pressure signal collected by the pressure sensor exceeds the pressure threshold, it is determined that there is a double fold at the tail of the steel coil.

[0009] A roll gap detection sensor is arranged between the two pinch rolls, and the roll gap detection sensor is used to monitor the roll gap between the two pinch rolls; The method for preventing equipment damage caused by abnormal overlapping rolling of a hot rolling finishing mill further includes: when the roll gap exceeds the distance threshold, it is determined that there is a double fold at the tail of the steel coil; A flying shear mechanism is installed after the hot coil box, and the flying shear mechanism is electrically connected to the microprocessor; The method for preventing equipment damage caused by abnormal overlapping rolling of a hot rolling finishing mill further includes: when the microprocessor obtains that there is a double fold at the tail of the steel coil, starting the flying shear mechanism to cut off the tail of the steel strip.

[0010] The controller is electrically connected to the flying shear mechanism, and after the controller obtains that the roll gap exceeds the distance threshold, it transmits a signal to the flying shear mechanism.

[0011] The beneficial effects of the present invention are as follows: The present invention monitors the pressure of the pinch rolls and the roll gap bounce value in real time to determine whether there is a double fold in the strip steel. These parameters can accurately judge the change of the strip steel tail, ensure that when a double fold occurs at the tail of the strip steel, an emergency shearing measure is immediately taken to prevent it from entering the finishing mill. Detailed implementation manners

[0012] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0013] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0014] A method for preventing equipment damage caused by abnormal overlapping rolling in a hot rolling finishing mill includes: Install a pressure sensor on the pinch rolls of the hot coil box to monitor the pressure change during the operation of the pinch rolls, and the pressure sensor uploads the pressure signal to the microprocessor; Set rotation sensors on both sides of the split pin, and the rotation sensors are used to monitor the rotation angle of the split pin; the rotation sensors upload the rotation angle signal to the microprocessor; The controller of the hot coil box is electrically connected to the microprocessor. The controller simultaneously sends action signals to the split pin and the microprocessor. When the microprocessor collects and accepts the action signal and the obtained rotation angle signal is zero, it is determined that there is a double fold at the tail of the steel coil; Alternatively, when the pressure signal collected by the pressure sensor exceeds the pressure threshold, it is determined that there is a double fold at the tail of the steel coil.

[0015] Set a roll gap detection sensor between the two pinch rolls, and the roll gap detection sensor is used to monitor the roll gap between the two pinch rolls; The method for preventing equipment damage caused by abnormal overlapping rolling in the hot rolling finishing mill further includes: when the roll gap exceeds the distance threshold, it is determined that there is a double fold at the tail of the steel coil; Install a flying shear mechanism after the hot coil box, and the flying shear mechanism is electrically connected to the microprocessor; The method for preventing equipment damage caused by abnormal overlapping rolling in the hot rolling finishing mill further includes: when the microprocessor obtains that there is a double fold at the tail of the steel coil, start the flying shear mechanism to cut off the tail of the steel strip.

[0016] The controller is electrically connected to the flying shear mechanism, and the controller transmits a signal to the flying shear mechanism after obtaining that the roll gap exceeds the distance threshold.

[0017] In some examples, the prerequisite judgment for starting the shear mechanism to operate: Only during normal production when the production line is in the automatic state can the following emergency shearing be activated to avoid damage to the flying shear caused by misjudgment during the process of processing scrap steel.

[0018] 2. Make a comprehensive judgment on the pressure and position sensor signals of the drive side and the operation side of the pinch rolls of the hot coil box in the PLC, and start the emergency shearing of the flying shear in case of abnormality: (1)When the actual feedback value of the roll gap bounce on the drive side of the pinch roll of the hot coil box ≥ the set value + 20 mm, start the emergency shear.

[0019] (2)When the actual feedback value of the roll gap bounce on the operator side of the pinch roll of the hot coil box ≥ the set value + 20 mm, start the emergency shear.

[0020] (3)When the actual feedback value of the pressure on the drive side of the pinch roll of the hot coil box ≥ the set value + 500 kN, start the emergency shear.

[0021] (4)When the actual feedback value of the pressure on the operator side of the pinch roll of the hot coil box ≥ the set value + 500 kN, start the emergency shear.

[0022] (5)When the actual feedback value of the roll gap bounce on the drive side of the pinch roll of the hot coil box ≥ the set value + 12 mm and the actual feedback value of the pressure on the drive side of the pinch roll of the hot coil box ≥ the set value + 350 kN, start the emergency shear.

[0023] (6)When the actual feedback value of the roll gap bounce on the drive side of the pinch roll of the hot coil box ≥ the set value + 12 mm and the actual feedback value of the pressure on the operator side of the pinch roll of the hot coil box ≥ the set value + 350 kN, start the emergency shear.

[0024] (7)When the actual feedback value of the roll gap bounce on the operator side of the pinch roll of the hot coil box ≥ the set value + 12 mm and the actual feedback value of the pressure on the drive side of the pinch roll of the hot coil box ≥ the set value + 350 kN, start the emergency shear.

[0025] (8)When the actual feedback value of the roll gap bounce on the operator side of the pinch roll of the hot coil box ≥ the set value + 12 mm and the actual feedback value of the pressure on the operator side of the pinch roll of the hot coil box ≥ the set value + 350 kN, start the emergency shear.

[0026] The rotation sensor can be a laser detector. Install laser detectors on both sides of the mushroom head of the tail-opening pin of the hot coil box. If the laser detectors detect that the mushroom heads of the tail-opening pins on both sides of the hot coil box do not rotate (i.e., not inserted into the coil core), it is considered that the tail of the steel coil will be double-folded, and start the emergency shear.

[0027] Install a position sensor and a pressure sensor in the oil cylinder of the pinch roll of the hot coil box to monitor the thickness and pressure changes of the strip in real time. Based on the deviation between the actual strip thickness and the set value, judge whether the strip is abnormal through mutation feedback, and then judge whether to start the emergency shear.

[0028] In the description of this specification, specific features, structures, materials, or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0029] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A method for preventing equipment damage caused by abnormal rolling of a hot rolling finishing mill, characterized in that: include: A pressure sensor is installed on the pinch roller of the hot coil box to monitor the pressure change of the pinch roller during operation, and the pressure sensor uploads the pressure signal to the microprocessor; Rotation sensors are arranged on both sides of the split pin, and the rotation sensors are used to monitor the rotation angle of the split pin; the rotation sensors upload the rotation angle signal to the microprocessor; The controller of the hot coil box is electrically connected to the microprocessor. The controller sends an action signal to the tail opening pin and the microprocessor at the same time. When the microprocessor collects and receives the action signal and the obtained rotation angle signal is zero, it is determined that there is a double fold at the tail of the steel coil. Alternatively, if the pressure signal collected by the pressure sensor exceeds a pressure threshold, it is determined that a double fold exists at the tail of the steel coil.

2. The method for preventing equipment damage caused by abnormal rolling of a hot rolling finishing mill according to claim 1, characterized in that: A roll gap detection sensor is arranged between the two pinch rollers, and the roll gap detection sensor is used to monitor the roll gap between the two pinch rollers; The method for preventing equipment damage caused by abnormal overlapping rolling of a hot rolling finishing mill further includes: when the roll gap exceeds a distance threshold, determining that a double fold exists at the tail of the steel coil.

3. The method for preventing equipment damage caused by abnormal rolling of a hot rolling finishing mill according to claim 1, characterized in that: A flying shear mechanism is installed behind the hot coil box, and the flying shear mechanism is electrically connected to the microprocessor; The method for preventing the hot rolling finishing mill from causing equipment damage due to abnormal overlapping rolling also includes: when the microprocessor obtains that the tail of the steel coil has a double fold, the flying shear mechanism is activated to cut off the tail of the steel strip.

4. The method for preventing equipment damage caused by abnormal rolling of a hot rolling finishing mill according to claim 1, characterized in that: The controller is electrically connected to the flying shear mechanism, and the controller transmits a signal to the flying shear mechanism after obtaining that the roller gap exceeds a distance threshold.