Mandrel Shaft Clamping for Hot Strip Coiler Maintenance
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Solution Overview
Problem
The existing hot strip coiler mandrel shaft changing process is time-consuming and requires significant equipment and space, leading to lengthy interruptions in the coiling process due to the need for heavy lifting gear and complex maneuvering.
Innovation Solution
A detachable clamping device is used to securely fasten and release the mandrel shaft within the coiler frame, allowing for easy axial removal and replacement, reducing the need for large lifting gear and minimizing equipment complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a heavy-duty mandrel shaft is used for hot strip coiling, then the coiling function is reliable, but the mandrel changing time increases significantly and requires heavy lifting gear
Solution Approach 1:
The mandrel shaft is divided into multiple segments that can be separated from each other. The drive-side part can be detached from the coil-side part, allowing the heavy mandrel to be broken down into lighter components that can be handled more easily and changed more quickly without requiring heavy lifting gear.
Solution Approach 2:
The detachable connection is implemented specifically at the drive-side part of the mandrel shaft where it connects to the bearing. This localized detachable design allows the mandrel to remain intact for coiling operations while enabling quick separation for changing, resolving the contradiction between reliability during operation and ease of replacement.
2Ease of operation
If heavy lifting gear is used to remove the mandrel shaft, then the mandrel can be changed, but the equipment complexity and space requirements increase
Solution Approach 1:
By segmenting the mandrel shaft into detachable parts, the need for heavy lifting gear is eliminated. The segments can be removed using simpler equipment through the existing bearing mounting structure, reducing both equipment complexity and space requirements while maintaining ease of operation.
Solution Approach 2:
The detachable connection structure acts as an intermediary mechanism between the mandrel shaft and the bearing. This intermediary design allows for easy separation without requiring external heavy lifting equipment, as the mandrel segments can be pulled out through the bearing mounting structure using the detachable connection mechanism.
3Stability of the object's composition
If the mandrel shaft is securely fastened in the bearing, then the coiling operation is stable, but the mandrel cannot be quickly removed
Solution Approach 1:
The connection between the mandrel shaft and bearing is made dynamic rather than static. The detachable connection allows the system to switch between a secured state during coiling operations and a detached state during changing operations. This dynamic capability resolves the contradiction by allowing secure fastening when needed and quick removal when needed.
Solution Approach 2:
The mandrel shaft is segmented with a detachable connection at the drive-side part, allowing it to be securely fastened to the bearing during operation while enabling quick separation for changing. The segmentation creates a modular design where the connection can be engaged or disengaged as needed, providing both stability during coiling and ease of removal during maintenance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution significantly reduces mandrel changing time from several hours to one to two hours, simplifies the process, and eliminates the need for storage and spreading cylinders, thereby minimizing personnel requirements and space needs.
Implementation Method 1
If hydraulic pressure is applied to this cavity, the clamping sleeve expands radially and, as a result, radial expansion occurs in the area of the bearing seat. This frictional connection can be released again by reducing the hydraulic pressure
Implementation Method 2
the clamping device is designed as a hydraulically actuated clamping sleeve... the clamping sleeve expands radially... This frictional connection can be released again by reducing the hydraulic pressure and the elastic deformation of the clamping sleeve is restored
Implementation Method 3
This tightening of the shaft-hub connection creates a frictional connection between the mandrel shaft and the bearing, more precisely the inner ring of the bearing. The mandrel shaft is then fixed in the machine frame
Data Source
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AI summary
The invention relates to a reel for winding metal strip, in particular rolled hot strip, having a mandrel shaft (2), which has a first shaft end piece (18), which is rotatably mounted by means of at least one bearing (4) provided in the machine frame (3) of the reel, a clamping device (5) being arranged between the at least one bearing (4) and the mandrel shaft (2), such that, in a clamped operating state, a frictional connection can be produced between the at least one bearing (4) and the mandrel shaft (2).