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Transmission speed control method and system for reversible mill

A technology of transmission speed and rolling mill, applied in the direction of roll speed control, etc., can solve the problems of unbalanced motor load, it is difficult to ensure that the actual values ​​of the upper and lower roll line speeds are completely consistent, and the motor is easy to overheat, etc., to reduce impact and achieve good control effects. Effect

Active Publication Date: 2015-10-14
WISDRI ENG & RES INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Many single-stand reversible rolling mills adopt the control method of independent transmission of the upper and lower rolls. In the actual production process, due to the influence of many factors such as the diameter of the work roll, the friction coefficient between the strip and the roll surface, cooling conditions, and the lubrication of the emulsion, It is difficult to ensure that the actual values ​​of the upper and lower roll line speeds are exactly the same, especially in the dynamic process
This situation will cause the load imbalance of the drive motor of the upper and lower rollers, and the motor will easily overheat

Method used

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  • Transmission speed control method and system for reversible mill
  • Transmission speed control method and system for reversible mill
  • Transmission speed control method and system for reversible mill

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Effect test

Embodiment 1

[0044] Such as figure 1As shown, Embodiment 1 of the present invention provides a transmission speed control method of a reversible rolling mill. The control device receives the set value of the transmission speed during the rolling process sent by the superior system, and then processes it. The method includes:

[0045] In step 201, the transmission speed setting value A at the current sampling time is obtained, and if the transmission speed setting value A has a step change compared with the transmission speed setting value B of the rolling mill at the previous moment, then it is determined that the The transmission speed setpoint B is adjusted to the rounding time of said transmission speed setpoint A and the predetermined acceleration.

[0046] In step 202, the speed setting value and the acceleration setting value at each sampling moment in the transition process are calculated according to the rounding time and the predetermined acceleration.

[0047] In step 203, accor...

Embodiment 2

[0061] The embodiment of the present invention also provides a transmission speed control system for a reversible rolling mill. The control system includes a control device 1, a frequency converter 2 and a rolling mill transmission device 3, wherein a series of transmission speed settings are stored in the control device 1. Fixed value, used to control the transmission speed in different rolling stages, such as figure 2 As shown, specifically:

[0062] The control device 1 is used to obtain the transmission speed setting value A at the current sampling time, if the transmission speed setting value A has a step change compared with the transmission speed setting value B of the rolling mill at the previous moment, determine The rounding time and predetermined acceleration of the transmission speed setting value A are adjusted from the transmission speed setting value B, and the speed setting value and the speed setting value at each sampling moment in the transition process are...

Embodiment 3

[0072] This embodiment provides a method for calculating the acceleration torque value according to the acceleration, which is used to illustrate the method involved in Embodiment 1, calculating the speed setting value and Acceleration setting value, specific implementation method.

[0073] In the rolling process of one pass of strip steel, there are multiple acceleration and deceleration stages. When the set value of the transmission speed changes step by step, the control quantity output by the transmission speed controller will fluctuate greatly, which will cause serious damage to the transmission equipment. greater impact. In the prior art, ramp processing is usually performed, that is, the uniform acceleration method is used to adjust the transmission speed setting value B in Embodiment 1 to the transmission speed setting value A. However, the embodiment of the present invention proposes a control method combined with rounding processing, so that the speed setting value ...

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Abstract

The invention relates to the technical field of cold rolling, and provides a transmission speed control method and system for a reversible mill. The method includes the steps that the transmission speed set value A at a current sampling moment is acquired, if the transmission speed set value A is in step change compared with the transmission speed set value B of the mill at a former moment, rounding time and preset acceleration in which the transmission speed set value B is adjusted to the transmission speed set value A are determined, speed set values and acceleration set values at sampling moments in the transition process are calculated according to the rounding time and the preset acceleration, and accelerating torque of the mill is calculated; speed adjusting torque is calculated through a proportional integral controller; the speed adjusting torque, the accelerating torque and no-load torque are summed, the total torque set value is obtained and transmitted to a frequency converter, the frequency converter finishes torque inner ring control over mill transmission, and then the transmission speed of the mill is controlled. According to the embodiment, impact on transmission equipment is reduced, the torque in the no-load process of the mill and the accelerating torque are also considered, and the accuracy of the total torque set value is improved.

Description

【Technical field】 [0001] The invention relates to the technical field of rolling mill transmission control, in particular to a transmission speed control method and system for a reversible rolling mill. 【Background technique】 [0002] The modern steel rolling industry has higher and higher requirements for product quality, thus putting forward technical requirements for high precision and high dynamic performance for the main drive control system of the rolling mill. Thanks to the continuous improvement of power electronics technology and industrial controllers, if a high-performance transmission control method is adopted, the control performance of the main drive system of a modern rolling mill can fully meet the stringent requirements. [0003] In the main drive system of modern rolling mills, AC motors have gradually replaced DC motors as the mainstream, and the control systems have adopted fully digital AC motor inverters and programmable logic controllers (Programmable ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/46
CPCB21B37/46
Inventor 陈跃华
Owner WISDRI ENG & RES INC LTD