Roll Assembly Drive Wheel Mounting for Deflection Compensation
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Solution Overview
Problem
Existing roller arrangements face challenges in compensating for large displacements and load reversals, leading to reduced service life and potential entanglement of drive and driven wheels due to crosshead deflection, especially when larger adjustments or load changes occur.
Innovation Solution
A deflection-controllable roller arrangement with a rotating hollow roller and a fixed crosshead, where the drive wheel is externally mounted and coupled to the roller's bearing, maintaining a constant distance between the drive and driven wheels, and utilizing hydraulic means and self-aligning bearings to manage crosshead deflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the drive wheel is mounted directly on the roller elements, then the structure is simpler and more compact, but the crosshead deflection causes the drive wheel to incline and twist relative to the driven wheel, leading to entanglement and reduced reliability
Solution Approach 1:
The mounting structure is segmented into separate functional components: the crosshead for supporting the roller, the bearing for rotational support, and the drive wheel mounting bracket. This segmentation allows each component to perform its specific function independently, with the bracket specifically designed to maintain drive wheel alignment despite crosshead deflection.
Solution Approach 2:
A mounting bracket serves as an intermediary element between the crosshead bearing and the drive wheel. This bracket is designed to maintain a constant distance between the drive wheel axis and the driven wheel axis, acting as a mediator that isolates the drive wheel from the effects of crosshead deflection while still allowing the bearing to accommodate roller movement.
2Reliability
If tension rollers are added to compensate for distance changes between drive and driven wheels, then the distance compensation is achieved, but the device complexity increases and additional space is required
Solution Approach 1:
The distance compensation function is extracted from the overall system and integrated directly into the drive wheel mounting bracket. Instead of adding separate tension rollers or flexible coupling mechanisms, the bracket itself is designed with the capability to maintain constant distance through its geometric configuration and mounting arrangement.
Solution Approach 2:
The mounting bracket performs multiple functions simultaneously: it supports the drive wheel, maintains constant distance between drive and driven wheels, accommodates crosshead deflection, and provides alignment stability. This multi-functionality eliminates the need for separate distance compensation mechanisms.
3Adaptability or versatility
If the roller is designed to accommodate large displacements and load reversals, then the adaptability is improved, but additional deflections with alternating bending reduce the service life of the traction mechanism
Solution Approach 1:
The mounting bracket and bearing assembly are designed with dynamic characteristics that allow them to accommodate large displacements and load reversals smoothly. The bearing enables the hollow roller to pivot without creating harmful alternating bending moments in the traction mechanism, while the bracket's geometric design ensures constant distance maintenance throughout the range of motion.
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 prevents the drive wheel from inclining with crosshead deflection, maintaining a constant distance between the drive and driven wheels, thus reducing the risk of entanglement and extending the service life by allowing for flexible movement and compensation without additional components like tension rollers.
Implementation Method 1
The roller comprises hydraulic means, preferably provided on the crosshead, for supporting the hollow roller on the crosshead
Implementation Method 2
preferably at each end of the hollow roller a bearing on which the hollow roller is rotatably supported relative to the crosshead
Data Source
Figure 1
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Figure 4
AI summary
The invention relates to a roll assembly, comprising a roll (1) the deflection of which can be controlled, a revolving hollow roll (2) forming the working roll circumference, a bearing (4) arranged at each end of the hollow roll (2), the hollow roll being rotatably supported on said bearing, an output (5), a drive wheel (6), and an output wheel (7) connected to the hollow roll, wherein the drive wheel (6) is mounted at least also externally, that is, not directly on elements of the roll (1), and further comprising a counter roll (9), wherein the mounting (8) of the drive wheel (6) is coupled to the bearing (4).