Reverse Rolling Mill Roller Table Speed Synchronization

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Solution Overview

Problem

In reversing rolling mills, unnecessary acceleration processes and energy consumption occur due to simultaneous acceleration of all transport rollers, leading to potential quality issues and drive strain, while ensuring synchronized peripheral speeds with rolling stock is challenging, especially in reversing stands where rolling stock direction alternates.

Innovation Solution

A control device calculates the entry time for each roller table area to adjust the peripheral speed of transport rollers to match the rolling stock's infeed speed, allowing for distributed acceleration and deceleration, ensuring the rollers reach the necessary speed before the stock enters, and includes a control reserve for unforeseen changes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If all transport rollers are accelerated simultaneously to synchronize with rolling stock, then synchronization is achieved, but unnecessary acceleration processes occur leading to increased energy consumption and drive strain

Engineering Contradiction:

Improvesynchronization of transport rollers with rolling stockVSAvoidenergy consumption of transport rollers

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The roller table is divided into multiple independently controllable roller table areas, each with its own transport rollers that can be accelerated individually based on when the rolling stock actually enters that specific area, rather than accelerating all rollers simultaneously

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The control device calculates the entry time for each roller table area in advance and accelerates the transport rollers of only that specific area before the rolling stock enters, rather than accelerating all rollers at once or waiting until the stock is already present

Inventive Principle:

Principle #10Preliminary action

2Reliability

If all transport rollers are accelerated simultaneously, then synchronization is achieved, but acceleration processes occur simultaneously causing mains feedback

Engineering Contradiction:

Improvesynchronization of transport rollers with rolling stockVSAvoidmains feedback from simultaneous acceleration

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The roller table is segmented into multiple independently controllable areas, allowing acceleration of only the specific roller table area that the rolling stock is about to enter, thereby distributing acceleration processes over time and avoiding simultaneous acceleration of all rollers

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The control device calculates entry times for each roller table area and initiates acceleration of transport rollers in that specific area before the rolling stock enters, ensuring synchronization while distributing acceleration events sequentially rather than simultaneously

Inventive Principle:

Principle #10Preliminary action

3Manufacturing precision

If transport rollers are accelerated to match rolling stock speed, then surface quality is maintained, but drive strain increases due to unnecessary acceleration

Engineering Contradiction:

Improvequality of rolling stock surfaceVSAvoiddrive strain on transport rollers

Core Design Contradiction:

Manufacturing precisionVSForce

Solution Approach 1:

The roller table is divided into independently controllable areas, allowing each area's transport rollers to be accelerated only when needed for the specific section the rolling stock is entering, reducing unnecessary acceleration events and associated drive strain

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The control device calculates when the rolling stock will enter each roller table area and accelerates the transport rollers of that specific area in advance to the required speed, ensuring surface quality is maintained while avoiding unnecessary acceleration of rollers in areas the stock will not enter

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentEP1993750B1Operational method for a reverse rolling mill

Publication Date: 2010.12.01 SIEMENS AG

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AI summary

The invention relates to a reverse rolling mill comprising at least one reversing stand (1) for rolling a rolled material (5), two roller tables (2, 3) which are used for transporting the rolled material (5) and which are arranged on both sides of the reversing stand (1), and a control device (4) for controlling the reverse rolling mill. The roller tables (2,3) comprise several roller table areas (6) and each area comprises at least one conveyor roller (7). The conveyor rollers (7) of each roller table area (6) can be controlled independently from the conveyor rollers (7) of the other roller table areas (6). The rolled material (5) is conveyed in such a way that the front of the rolled material is displaced at an intake speed (vE) and the end of the rolled material is displaced at a delivery speed (vA). The control device (4) individually calculates an earliest intake time point (TE), in relation to the reversing stand (1), at least for each roller table area (6) located on the delivery side with respect to the respective conveyor step, at which the rolled material is taken into the respective roller table area (6) and controls the conveyor rollers of said area (7) in such a way that the peripheral speed is matched to the intake speed (vE), at the latest, at the intake time point (TE).