A full-automatic gear shifting function control method for a strip steel production line reel speed reducer

Abstract

The application provides a method for calculating the speed value of a lower block strip steel and a full-automatic gear shifting function control method of a reel speed reducer of a strip steel production line. The method is characterized in that a new method for calculating the speed value of the lower block strip steel is designed, and the full-automatic gear shifting function of the reel speed reducer is developed according to the calculated speed value. The method can reduce the accidents of waste steel caused by the failure of the operator to judge and shift gears in time and the accidents of the reel motor tripping caused by the speed exceeding the speed limit of the gear position, and can reduce the time for the operator to confirm the gear shifting time, reduce the working strength, and achieve the purposes of stable production and improved yield. The full-automatic gear shifting function can reduce the time for the operator to confirm the gear shifting speed and manually shift gears, the gear shifting time is more accurate, the gear shifting is more rapid, the workload of the operator can be reduced, and the service life of the gear position gear and the motor frequency converter is prolonged.

Description

Technical Field

[0001] This invention relates to the field of steel technology, and in particular to a fully automatic shifting function control method for a strip steel production line drum reducer. Background Technology

[0002] To reduce installed capacity and energy consumption, the drum motor of the strip steel production line is equipped with a stop-and-shift device within the reducer. For thicker strips at low speeds, the reducer uses the first low-speed gear for winding; for thinner strips at high speeds, it uses the second high-speed gear. Conventional shifting is performed semi-automatically by production personnel manually canceling the coiler's backup signal based on the secondary calculated strip speed. After shifting, the coiler's backup signal must be manually reactivated. However, the secondary calculated strip speed is significantly affected by factors such as real-time temperature, rolling force, and drawing speed, resulting in large fluctuations. This makes it difficult to provide effective data for shifting operations, ensuring that shifting is completed before the head of the next strip is wound. Operators cannot effectively control the shifting timing, frequently leading to scrap accidents or drum motor tripping due to untimely shifting or exceeding the speed limit. Summary of the Invention

[0003] To address the shortcomings of the existing technology, this invention provides a fully automatic gear shifting function control method for a strip steel production line drum reducer. By designing a new method for calculating the speed value of the lower strip steel, and developing a fully automatic gear shifting function for the drum reducer based on the calculated speed value, this invention reduces accidents caused by operator errors leading to untimely gear shifting and scrapping, as well as accidents caused by the drum motor tripping due to speed exceeding the gear limit. At the same time, it can reduce the time for operators to confirm the timing of gear shifting, reduce workload, and achieve the goals of stable production and improved yield.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A method for calculating the velocity value of the lower strip steel includes the following steps: S1. Based on the principle of constant flow rate per second, the speed of the next strip in the coiling area is calculated in real time by using the hot width, hot thickness, and actual speed of the continuous casting sector exit and the hot thickness and hot width of the next strip at the finishing mill exit. S2. By comparing with the production history curve, optimize and adjust the proportional coefficient of the newly calculated strip speed value to reduce the difference between the calculated value and the actual value; S3. Use the new calculated strip speed value to replace the original secondary calculated speed value. The new calculated speed value is displayed on the production operation interface to provide a stable basis for judgment in production operations.

[0005] In some embodiments, if the continuous casting exit speed detection is abnormal in step S1, the speed can be automatically switched to the speed detected by the encoder of the previous sector section roller.

[0006] A method for controlling a fully automatic gear shifting function includes the following steps: T1. When the head of the lower strip is in the roughing zone, the average speed of the lower strip during this time period is calculated using the method described above. This average speed is used for fully automatic gear shifting speed determination. When the head of the lower strip exceeds the roughing zone, the average speed within this interval is locked and is not affected by other external factors. T2, Set the speed for automatic switching between first and second gear; T3. The fully automatic shifting function adds the logical judgment condition of "the head of the next strip is tracked before the induction furnace", which reserves sufficient time for fully automatic shifting and ensures that the shifting operation is completed before the head of the next strip enters the coiler. T4. During fully automatic gear shifting, the "winding machine standby" signal in the original shifting conditions is blocked, as are the "winding machine drum motor speed is 0" and "winding machine READY" conditions, to ensure that the winding machine is in "OK" state after the shifting is completed. T5. The fully automatic gear shifting function adds logical judgment conditions for "the current coiler is not in steel coiling mode" and "there is no steel coil in the current coiler"; T6. During fully automatic gear shifting, an "Auto change gear" dialog box will pop up on the winding operation screen as a reminder. After the gear shift is completed, the dialog box will be hidden. T7. Added automatic shifting switching function in case of accidents or abnormalities.

[0007] In some embodiments, step T2 includes the following steps: When the average calculated speed of the strip steel reaches a certain set speed V1, it is determined that the first gear will switch to the second gear. When the average speed of the lower strip drops to V2, it is determined that the second gear is switched to the first gear, where V1≥V2.

[0008] In some embodiments, when it is determined that the calculated speed value of the next strip steel reaches the shift condition, the current gear is automatically switched off and the next gear is automatically switched on.

[0009] In some embodiments, if the current coiler is in the coiling state during step T5, and the calculated speed value of the next strip reaches the fully automatic shifting condition, the current coiler does not perform the shifting operation. Instead, the steel coil needs to be unloaded from the coiler before the shifting operation is performed to prevent scrap steel from being caused by shifting during the coiling process.

[0010] In some embodiments, a selection button is added to the production operation screen in step T7, which can enable and disable the fully automatic gear shifting function with one click.

[0011] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows: The fully automatic gear shifting function provided by the present invention can reduce the time for production personnel to confirm the gear shifting speed and manually shift gears, the shifting timing is more accurate, the shifting is faster, the workload of production personnel can be reduced, and the service life of gears and motor frequency converters can be extended. Detailed Implementation

[0012] The technical solution of the present invention will be described in detail below with reference to specific embodiments to further understand the purpose, solution and effect of the present invention, but it is not intended to limit the scope of protection of the appended claims.

[0013] This invention provides a method for calculating the velocity value of the lower strip, comprising the following steps: S1. Based on the principle of constant flow rate per second, the speed of the next strip in the coiling area is calculated in real time by using the hot width, hot thickness, and actual speed of the continuous casting sector exit and the set hot thickness and hot width of the next strip at the finishing mill exit. When the continuous casting exit speed is detected abnormally, it can automatically switch to the speed detected by the encoder of the previous sector roller.

[0014] S2. By comparing with the production history curve, optimize and adjust the proportional coefficient of the newly calculated strip speed value to reduce the difference between the calculated value and the actual value; S3. Use the new calculated strip speed value to replace the original secondary calculated speed value. Display the new speed calculation value on the production operation interface to provide a stable basis for judgment in production operations.

[0015] Another embodiment of the present invention provides a fully automatic gear shifting function control method, comprising the following steps: T1. To prevent fluctuations in the calculated speed value due to changes in external conditions, which could lead to gear shifting disorder, when the head of the lower strip is located in the roughing zone, the average speed of the lower strip during this time period is calculated using the method described in claims 1-2 for fully automatic gear shifting speed determination. When the head of the lower strip exceeds the roughing zone, the average speed within this interval is locked and is not affected by other external factors. T2. Set the automatic switching speed between first and second gear. When the average calculated speed of the next strip reaches a certain set speed V1, determine to switch from first gear to second gear; when the average speed of the next strip drops to V2, determine to switch from second gear to first gear, where V1≥V2; when the calculated speed value of the next strip meets the shifting condition, automatically turn off the current gear and turn on the next gear. T3. The fully automatic shifting function adds the logical judgment condition of "the head of the next strip is tracked before the induction furnace", which reserves sufficient time for fully automatic shifting and ensures that the shifting operation is completed before the head of the next strip enters the coiler. T4. During fully automatic gear shifting, the "winding machine standby" signal in the original shifting conditions is blocked, as are the "winding machine drum motor speed is 0" and "winding machine READY" conditions, to ensure that the winding machine is in "OK" state after the shifting is completed. T5. The fully automatic shifting function adds logical judgment conditions of "the current coiler is not in steel coiling mode" and "there is no steel coil in the current coiler". When the current coiler is in steel coiling mode, when the calculated speed value of the next strip reaches the fully automatic shifting condition, the current coiler will not perform the shifting operation. The steel coil must be unloaded from the coiler before the shifting operation is performed to prevent scrap steel caused by shifting during steel coiling. T6. During fully automatic gear shifting, an "Auto change gear" dialog box will pop up on the winding operation screen as a reminder. After the gear shift is completed, the dialog box will be hidden. T7. Add a function to switch the fully automatic gear shifting in case of accidents or abnormalities. Add a selection button to the production operation screen to enable and disable the fully automatic gear shifting function with one click.

[0016] This invention presents a novel method for calculating the speed of the lower strip steel block. Based on the calculated speed, a fully automatic gear shifting function for the reducer is implemented. A redundant switching function is also designed to prevent shifting malfunctions. The fully automatic gear shifting function provided by this invention reduces the time required for production personnel to confirm shifting speeds and perform manual shifting. Shifting timing is more precise, and shifting is faster, reducing the workload of production personnel and extending the service life of the gears and motor inverter.

[0017] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A method for controlling fully automatic gear shifting, characterized in that: Includes the following steps: T1. When the head of the lower strip is in the roughing zone, calculate the average speed of the lower strip during this time period for automatic gear shifting speed determination. When the head of the lower strip exceeds the roughing zone, lock the average speed within this range to prevent interference from other external factors. T2, Set the speed for automatic switching between first and second gear; T3. The fully automatic shifting function adds the logical judgment condition of "the head of the next strip is tracked before the induction furnace", which reserves sufficient time for fully automatic shifting and ensures that the shifting operation is completed before the head of the next strip enters the coiler. T4. During fully automatic gear shifting, the "winding machine standby" signal in the original shifting conditions is blocked, as are the "winding machine drum motor speed is 0" and "winding machine READY" conditions, to ensure that the winding machine is in "OK" state after the shifting is completed. T5. The fully automatic gear shifting function adds logical judgment conditions for "the current coiler is not in steel coiling mode" and "there is no steel coil in the current coiler"; T6. During fully automatic gear shifting, an "Auto change gear" dialog box will pop up on the winding operation screen as a reminder. After the gear shift is completed, the dialog box will be hidden. T7. Added a fully automatic gear shifting switch function in case of accidents or abnormalities; In step T1, the calculation method for the speed of the lower strip is as follows: Based on the principle of constant flow rate per second, the speed of the next strip in the coiling area is calculated in real time by taking into account the hot width, hot thickness, and actual speed of the continuous casting sector exit and the hot thickness and hot width of the next strip at the finishing mill exit. By comparing with historical production curves, the proportional coefficient of the newly calculated strip speed value is optimized and adjusted to reduce the difference between the calculated value and the actual value; The new calculated strip speed value replaces the original secondary calculated speed value. The new calculated speed value is displayed on the production operation interface, providing a stable basis for judgment in production operations.

2. The fully automatic gear shifting function control method according to claim 1, characterized in that: The T2 step includes the following steps: When the average calculated speed of the strip steel reaches a certain set speed V1, it is determined that the first gear will switch to the second gear. When the average speed of the lower strip drops to V2, it is determined that the second gear is switched to the first gear, where V1≥V2.

3. The fully automatic gear shifting function control method according to claim 2, characterized in that: When the calculated speed value of the next strip steel reaches the shift condition, the current gear is automatically switched off and the next gear is automatically switched on.

4. The fully automatic gear shifting function control method according to claim 1, characterized in that: In step T5, if the current coiler is in the coiling state and the calculated speed value of the next strip reaches the fully automatic shifting condition, the current coiler will not perform the shifting operation. The steel coil must be unloaded from the coiler before the shifting operation is performed to prevent scrap steel from being caused by shifting during the coiling process.

5. The fully automatic gear shifting function control method according to claim 1, characterized in that: In step T7, a selection button is added to the production operation screen, which can enable and disable the fully automatic gear shifting function with one click.