Sleeve Roll Eccentric Locking for Stable Forming Element Adjustment
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Solution Overview
Problem
Existing sleeve rolls for fiber web machines face challenges in maintaining accurate and durable adjustment of the forming element due to the constant transmission of torque through screws, leading to corrosion and thread stripping, which compromises the reliability of the adjustment mechanism.
Innovation Solution
The sleeve roll incorporates an eccentric adjustment element pivoted to the rocker bearing structure, allowing for precise locking and release of the adjusting arm, which is supported by a support frame to withstand large forces and prevent unintentional rotation, ensuring reliable adjustment of the forming element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a screw is used to adjust and lock the forming element position, then the adjustment mechanism is simple and easy to operate, but the screw and threads are subjected to constant substantial forces leading to corrosion, thread stripping, and mechanical failure
Solution Approach 1:
The invention extracts the locking function from the adjusting screw by introducing a separate locking nut that engages with the adjusting arm's threaded bore. This separates the adjustment function (performed by the screw on the rocker bearing structure) from the locking function (performed by the locking nut on the adjusting arm), allowing each component to be optimized for its specific function and reducing the mechanical stress on any single component.
Solution Approach 2:
The adjusting arm serves as an intermediary component between the rocker bearing structure and the forming element. It translates the angular adjustment of the rocker bearing structure into linear positioning of the forming element, and provides a threaded bore for the locking nut to secure the position. This intermediary structure allows for reliable locking without subjecting the original adjusting screw to constant substantial forces.
2Reliability
If the screw threads are designed to be strong enough to withstand substantial forces, then the adjustment mechanism is reliable, but the threads become difficult to manufacture with the required accuracy
Solution Approach 1:
The invention segments the adjustment mechanism into distinct functional components: the rocker bearing structure with its own adjustment screw, the adjusting arm with a separate threaded bore, and the locking nut. This segmentation allows each threaded component to be designed and manufactured for its specific loading conditions, with the locking nut's threaded bore optimized for holding strength rather than fine adjustment accuracy.
Solution Approach 2:
The locking function is extracted from the original adjusting screw and placed in a separate locking nut. This allows the threaded bore in the adjusting arm to be designed specifically for locking purposes, with thread geometry optimized for withstanding substantial forces, while the rocker bearing structure's screw maintains its precision for fine adjustment movements.
3Adaptability or versatility
If the adjusting arm is allowed to rotate freely during operation, then the sleeve roll can adapt to operational variations, but the forming element position becomes unstable and unintentional rotation occurs
Solution Approach 1:
The invention creates a dynamic locking system where the locking nut can be easily engaged and disengaged to switch between locked (stable position) and unlocked (adjustable position) states. During operation, the forming element can be locked at the desired position to maintain stability, but can be quickly unlocked to adapt to operational variations or wear, providing both stability and adaptability as needed.
Solution Approach 2:
The locking function is extracted and implemented through a separate locking nut that can be independently engaged or disengaged from the adjusting arm's threaded bore. This allows the operator to lock the forming element position for stable operation, or unlock it to allow the adjusting arm to rotate and adapt to operational variations, without compromising either stability or adaptability.
Data Source
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AI summary
The invention relates to a sleeve roll for a wire section of a fiber web machine, which sleeve roll (21) includes - an axle beam (28) with an axle stub (53), the axle stub being supported in a bearing housing (54) equipped with a rocker bearing structure (56), - two circular roll heads (29) and a belt loop (30) arranged around the axle beam (28) and tensioned between the roll heads (29), - a convex forming element (22) for water removal, and - adjustment means (60) configured to lock the axle beam (28) in place after adjustment of the forming element (22), the adjustment means (22) comprises an annular adjusting arm (64) with a support surface (62), the adjusting arm being attached to the axle stub (53), and an eccentric adjustment element (66) pivoted to the rocker bearing structure (56) for supporting the adjusting arm (64) in place, the adjustment element (66) being lockable in place to the rocker bearing structure (56) for locking the adjust4ment arm (64) and releasable for changing the position of the adjusting arm (64) .