Deflection Guide Pressure Lamellae Roller Friction Reduction
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Solution Overview
Problem
Existing deflection guides for laying slivers in fiber fabric production face challenges in reducing friction between pressure lamellae and adhesive tape, leading to inadequate contact pressure and difficulties in removing the adhesive tape without lifting the fiber layer.
Innovation Solution
The introduction of pressure lamellae with sliding surfaces and rollers, where the holders for the rollers are laterally mounted and can displace within recesses in the pressure lamellae, allowing for reduced friction and independent pressurization without the need for large roller diameters, and the use of resilient sliding shoes and grooved disks for adaptable pressure distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If pressure lamellae without rollers are used for sliver deflection, then the structure is simple, but the frictional resistance between the deflection guide and fiber slivers is high
Solution Approach 1:
Rollers are introduced as intermediary elements between the pressure lamellae and the slivers. These rollers rotate during operation, providing a mediating contact surface that significantly reduces frictional resistance compared to direct sliding contact between the pressure lamellae and slivers, while maintaining the structural simplicity of the pressure lamellae themselves.
Solution Approach 2:
The sliding friction mechanism is replaced with a rolling friction mechanism. Instead of the pressure lamellae directly sliding against the slivers, rollers are mounted on these lamellae to convert the sliding contact into rolling contact, thereby reducing the frictional resistance to a much lower level.
2Object-affected harmful factors
If pressure rings with large diameters are used to reduce friction, then the friction is reduced, but the contact pressure on the sliver decreases and adhesive tape removal becomes difficult
Solution Approach 1:
The diameter parameter of the rollers is optimized to a small size, fundamentally different from the large-diameter pressure rings in prior art. This parameter change enables the rollers to maintain small contact areas with the slivers, thereby preserving high contact pressure while still reducing friction through the rolling mechanism. The small roller diameter is key to simultaneously achieving low friction and high contact pressure.
Solution Approach 2:
The pressing mechanism using large-diameter pressure rings is replaced with small-diameter rollers mounted on pressure lamellae. This substitution fundamentally changes the friction-pressure relationship: the rolling contact reduces friction while the small roller diameter maintains high contact pressure, resolving the contradiction that plagued the pressure ring design.
3Stress or pressure
If rollers with small diameters are used to maintain contact pressure, then the contact pressure is maintained, but the frictional resistance increases
Solution Approach 1:
The critical innovation is replacing sliding friction with rolling friction through the introduction of rotatable rollers. Even though the rollers have small diameters to maintain contact pressure, the rolling mechanism itself dramatically reduces frictional resistance compared to sliding contact. The key is that rolling friction is inherently much lower than sliding friction, regardless of the roller diameter.
Solution Approach 2:
The rollers are designed to rotate dynamically during operation rather than remaining static. This dynamic rotation is what enables the rolling friction mechanism to function, allowing the small-diameter rollers to maintain high contact pressure while simultaneously reducing friction through their rotational motion as they follow the contour of the laid fiber layers.
4Productivity
If the adhesive tape is removed from the fiber layer, then the fiber layer can be laid, but there is a risk of the fiber layer being partially lifted off
Solution Approach 1:
The contact pressure parameter is precisely controlled through the small-diameter roller design and the pressure lamellae system. By maintaining high contact pressure during the laying process, the fiber layer is firmly pressed onto the laid fabric, preventing partial lifting when the adhesive tape is removed. The pressure parameter is optimized to ensure both efficient tape removal and fiber layer integrity.
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 configuration reduces frictional resistance and enables effective contact pressure on the fiber layers while allowing for easy removal of the adhesive tape, with the ability to follow the fiber structure's surface shape and apply pressure in graduated increments, enhancing the laying process.
Implementation Method 1
the frictional resistance between the pressure lamellae and the adhesive tape of the slivers when the slivers are pressed against the already laid fiber layers
Implementation Method 2
pressure lamellae with rollers for belt deflection... the frictional resistance between the deflection guide designed according to the invention and the fiber slivers is significantly reduced
Implementation Method 3
apply a pressure medium via a membrane, so that the individual pressure lamellae also can follow an uneven course of the already laid fiber layers
Implementation Method 4
the sliding shoes of the pressure lamellae are divided by slots parallel to the plane of the lamellae into independently spring-loaded sliding segments
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A device for laying fiber tapes is described, comprising a deflection guide (1) for the fiber tapes (2) made of pressure plates (6) arranged side by side transversely to the deflection axis and a frame (8) movable in the laying direction for receiving the pressure plates (6). To create advantageous pressure conditions, it is proposed that pressure plates (7) with rollers (11) for tape deflection are provided between pressure plates (6) with a sliding surface (16) for tape deflection, and that the holders (13) for the rollers (11) arranged laterally on the pressure plates (7) engage in recesses (15) of the pressure plates (6) with the sliding surfaces (16) in a manner displaceable in the pressure direction.