Papermaking Dewatering Bar With Wall Position Feedback
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Solution Overview
Problem
Existing dewatering bars on papermaking machines face challenges in precisely setting the angle between the dewatering bar surface and the screen belt, leading to difficulties in controlling the dewatering process and fiber orientation due to interaction with the screen belt.
Innovation Solution
The dewatering bar incorporates a deformable wall with regions of varying bending stiffness and a detection device to accurately measure and adjust the position of the wall facing the screen belt, allowing precise control of the gap and turbulence in the fiber suspension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the angle between the dewatering bar surface and the screen belt is adjusted by pressure changes in the chamber, then the dewatering performance can be optimized, but the exact position of the surface is difficult to set due to interaction with the screen belt
Solution Approach 1:
The patent replaces the indirect pressure-based positioning mechanism with a direct mechanical measurement system. A measurement device with a measuring element that directly contacts the dewatering bar surface provides precise position feedback, eliminating the uncertainty caused by pressure-induced deformations and screen belt interactions.
Solution Approach 2:
The patent implements a feedback mechanism where the measurement device continuously monitors the actual position of the dewatering bar surface and provides this information to the control system. This feedback loop enables precise positioning by comparing the measured position with the target position and making necessary adjustments.
2Adaptability or versatility
If the wall of the chamber is made deformable to change the surface position, then the angle adjustment capability is improved, but the control precision over the surface position is reduced
Solution Approach 1:
The measurement device provides real-time feedback on the actual surface position, enabling the control system to compensate for the deformability of the wall. This feedback mechanism allows the system to maintain precise control over the surface position despite the wall's ability to deform for angle adjustment.
Solution Approach 2:
The measurement device acts as an intermediary between the deformable wall and the control system, providing accurate position information that mediates between the wall's deformability and the need for precise position control. This intermediary measurement capability resolves the contradiction between adaptability and precision.
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
Enables precise control of the dewatering process and fiber orientation by directly detecting the position of the wall, enhancing the dewatering efficiency and fiber suspension dynamics.
Implementation Method 1
the wall facing the screen belt of the papermaking machine can be deformed by pressure changes in the chamber to enable the angle between the wall and the screen belt to be changed
Data Source
AI summary
A dewatering bar on a papermaking machine includes a main body with a longitudinal direction aligned transversely to the direction of movement of a screen belt. The main body has at least one chamber closed in a pressure tight manner, which extends in the longitudinal direction of the dewatering bar. The chamber has a connection to a pressure line, a wall having a surface facing the screen belt of the papermaking machine, and side walls connected to the wall. The position of the wall of the chamber is variable, and a device for detecting the change in position of the wall due to changes in the pressure is disposed in the chamber. A wire section of a papermaking machine is also provided.