Nip Force Control via Adjustable Stop and Pressure Sensor
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Solution Overview
Problem
Existing methods for measuring and controlling nip forces between rotating rolls in paper manufacturing processes are complex, susceptible to disturbances, and require cumbersome calibration, especially when dealing with rubberized or elastomeric roll covers, which can lead to thermal issues and premature aging.
Innovation Solution
A system comprising a fixed roll, a pivoting roll, a loading cylinder, an adjustable stop mechanism, and a pressure sensing device, where the pivoting roll is pivotable and the adjustable stop is controlled by a controller to measure and adjust the nip force accurately, allowing for on-line monitoring and control of nip forces without the need for complex calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional signal transfer devices (glide rings, telemetry equipment) are used to transfer signals from rotating rolls, then signal transfer is achieved, but the system becomes complicated and susceptible to disturbance
Solution Approach 1:
The patent extracts the signal transfer function from the rotating roll system by using a stationary pressure sensing device that measures nip force directly at the roll surface. This eliminates the need for complex signal transfer mechanisms like glide rings or telemetry equipment, as the measurement is taken statically rather than requiring signal transmission from a rotating component.
2Productivity
If pressure sensing devices are placed directly on rotating rolls for on-line measurement, then on-line measurement capability is achieved, but calibration becomes complicated and prone to error
Solution Approach 1:
The patent introduces an intermediary adjustable stop mechanism that serves as a reference surface for calibration. The stop can be positioned at known locations relative to the roll, providing a mechanical reference that simplifies calibration procedures. This intermediary element allows for easy verification and adjustment of the pressure sensing device without complex calibration equipment or procedures.
3Manufacturing precision
If rubber covered rolls are used in nip applications, then desirable product characteristics are achieved, but thermal issues and premature aging occur
Solution Approach 1:
The patent implements a feedback control system that continuously monitors nip force using the pressure sensing device and adjustable stop mechanism. By providing real-time feedback on actual nip force conditions, the system can optimize operating parameters to reduce thermal buildup and stress on rubber covers, thereby extending their service life while maintaining product quality.
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 provides accurate and efficient measurement and control of nip forces, reduces downtime due to thermal changes in roll covers, and enables rapid changeover between product runs, ensuring consistent product quality and reducing operational costs.
Implementation Method 1
measuring a nip pressure exerted by said pivoting roll upon said adjustable stop with said pressure sensing device
Implementation Method 2
providing a load cylinder for adjusting said second longitudinal axis relative to said first longitudinal axis, said load cylinder adjusting a position of said pivoting roll about said pivot axis
Data Source
AI summary
The present disclosure provides a process for monitoring and controlling the nip force between a fixed roll having a first longitudinal axis and a pivoting roll having a second longitudinal axis.