Cylinder Mold Adjusting Mechanism for Paper Machine
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Solution Overview
Problem
Existing cylindrical mold cylinders for paper production face challenges in achieving precise adjustment with high concentricity and cylindricity, particularly in changing the paper format and diameter, due to complex mechanisms and imbalances.
Innovation Solution
A structurally simple adjusting mechanism using a retaining ring and an adjustable ring with angled slots allows for precise radial displacement of rods, converting rotary movement into radial displacement without the need for restoring elements, ensuring high concentricity and cylindricity, and is designed to minimize imbalances and actuating forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a complex lifting mechanism with many levers is used to move supporting rods radially, then the rod displacement can be achieved, but the device complexity increases and structural simplicity is reduced
Solution Approach 1:
The invention extracts and eliminates the complex system of multiple levers and lifting mechanisms from the rod displacement system. Instead, it uses a simple rotating ring with radially extending elements that directly push or pull the rods radially through slots in the retaining ring, achieving the same function with dramatically reduced complexity.
Solution Approach 2:
The rotating adjusting ring serves as an intermediary mechanism between the axial movement of rods and their radial displacement. The ring's radially extending elements interact with the rods through slots, converting axial rod movement into radial displacement without requiring complex lever systems.
2Reliability
If restoring elements such as springs or clamping devices are used to maintain rod position, then rod stability is improved, but the device complexity and actuating forces increase
Solution Approach 1:
The system is designed to be self-regulating through the geometric relationship between the angled slots and the rotating ring. As the ring rotates, the slots naturally guide the rods to their correct radial positions without requiring external restoring forces. The mechanism inherently maintains stability through its geometry rather than additional components.
Solution Approach 2:
The invention removes all restoring elements such as springs, clamps, and other positioning devices from the system. Rod position stability is achieved purely through the kinematic constraint of the angled slots interacting with the rotating ring, eliminating the need for separate stabilizing components.
3Ease of operation
If the adjusting mechanism is not rotationally symmetrical, then adjustment functionality is achieved, but disturbing imbalances are introduced in the cylinder mold
Solution Approach 1:
While the overall mechanism maintains rotational symmetry for balance, individual slot angles are specifically designed asymmetrically relative to the radial direction. This controlled asymmetry in slot orientation enables the conversion of axial movement to radial displacement while the symmetric distribution of slots around the ring prevents imbalances in the cylinder mold.
4Ease of manufacture
If the slot angle is not optimized, then simple manufacturing is achieved, but the transmission ratio between adjusting movement and radial displacement is suboptimal, requiring excessively high actuating forces
Solution Approach 1:
The invention optimizes the slot angle parameter to a specific value (preferably 45 degrees relative to the radial direction) that provides the best compromise between manufacturing simplicity and mechanical advantage. This angular parameter optimization ensures that the conversion from axial to radial movement occurs with minimal required actuating force while maintaining ease of manufacture.
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
The mechanism enables precise adjustment of the cylinder mold diameter with high accuracy, maintaining concentricity and cylindricity, achieving a diameter deviation of no more than 0.01% from the target, and allows for efficient dewatering with an open contact surface area of over 85%.
Implementation Method 1
The rod is forced, i.e. the rotary movement between the adjusting ring and the retaining ring is immediately converted into a corresponding radial displacement
Data Source
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AI summary
The invention relates to a cylinder mold for a paper machine having a plurality of axially running and radially displaceable bars (9), each bearing a segment of a contact surface. The aim of the invention is to provide a precise adjusting mechanism using constructively simple means and ensuring high concentric precision and exact cylindricity. Said aim is achieved in that each bar (9) penetrates at least one first elongated hole of a retaining ring mounted on a cylinder frame, and penetrates at least one second elongated hole of an adjusting ring that can be rotated in the circumferential direction relative to the retaining ring, wherein the second elongated hole extends diagonally relative to the first elongated hole.