Cylinder Pressure Regulator for Combing Machine Speed Synchronization
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Solution Overview
Problem
Conventional tear-off cylinder units in combing machines experience irregularities in the combing fleece due to different moments of inertia between the printing and tear-off cylinders, leading to significant speed deviations and quality issues in the combed nonwoven, especially at higher combing speeds.
Innovation Solution
A tear-off cylinder unit with a pressure regulator that adjusts the pressure force on the printing cylinder relative to the tear-off cylinder based on the combing machine's speed, using an electrically controllable pressure valve to maintain a pressure force between 210 N and 642 N, thereby minimizing speed deviations between the two cylinders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a standard pressure force of around 6.5 bar is set using the pressure adjustment device, then the cylinders are pressed against each other with equal forces, but this results in significant speed deviations and slippage between the printing cylinder and tear-off cylinder at high combing speeds
Solution Approach 1:
The patent applies the dynamics principle by making the pressure force adjustable based on operating conditions. The pressure adjustment device allows the pressure force to be dynamically changed according to the combing speed, transforming a static pressure system into a dynamic one that adapts to different operational requirements, thereby preventing slippage at high speeds while maintaining adequate pressure at lower speeds
Solution Approach 2:
The patent implements parameter changes by modifying the pressure force parameter according to the combing speed. At higher combing speeds, the pressure force is increased to compensate for the different moments of inertia and prevent slippage, while at lower speeds, the pressure force is reduced to minimize mechanical stress on the cylinders and gearbox, thus optimizing both speed synchronization and mechanical durability
2Strength
If the tear-off cylinder and printing cylinder are made of metal with rubber-elastic coating, then they have the required durability and coating properties, but this results in relatively heavy weight and large moment of inertia
Solution Approach 1:
The patent applies composite materials by combining metal (for structural strength and durability) with rubber-elastic coating (for friction and grip properties). This composite structure provides both the required mechanical strength and the necessary surface properties for effective fiber processing, while the patent acknowledges the trade-off with increased weight and moment of inertia, which is managed through dynamic pressure adjustment
3Device complexity
If the pressing device presses both cylinders with equal forces, then the pressure adjustment is simple, but this leads to error tolerances in speed up to 25% at 650 KS/min, which is unacceptable for quality production
Solution Approach 1:
The patent changes the pressure force parameter dynamically based on combing speed to maintain speed synchronization precision. By adjusting the pressure force upward at higher speeds, the system compensates for the different moments of inertia between cylinders, reducing speed error tolerance from potentially 25% down to acceptable levels for quality production, while keeping the adjustment mechanism relatively simple
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 adjustment ensures a slip error tolerance of no more than 3.0% between the printing and tear-off cylinders, significantly improving the quality of the combed fleece by maintaining synchronized speeds and reducing mechanical interactions that cause slippage.
Implementation Method 1
the compressed air connection (52) is connected via a pressure regulator (54) and an electrically controllable pressure valve (56) to the piston (34) of the printing cylinder (24)
Implementation Method 2
The pressure regulator preferably comprises at least one electrically controllable pressure valve. The electrically controllable pressure valve is designed to throttle the system pressure from the pressure line and thus transfer reduced pressure to the pressing device.
Implementation Method 3
the piston (34) of the printing cylinder (24) can be acted upon with a compressed air pressure
Data Source
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AI summary
The invention relates to a detaching cylinder assembly with a device for pressure cylinders of detaching cylinder pairs of a combing machine, comprising a cylinder pair (20a, 20b), which consists of a detaching cylinder (22a) that can be rotated in the combing machine and a pressure cylinder (24a), and comprising a pressing device (26a, 26b) for pressing the pressure cylinder (24a) and the detaching cylinder (22a) of the cylinder pair (20a) against each other. A pressure is applied to the pressure cylinder (24a) via the pressing device (26a), and the pressing device (26a) is connected to a compressed air connection (52). According to the invention, the compressed air connection (52) is connected to a pressure regulator (54) which is designed such that on the basis of a specified rotational speed of the combing machine, a corresponding pressure force can be set for the pressure cylinder (24a) for pressing against the detaching cylinder (22a).