Hollow Profile Circular Comb Mass Balance
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Solution Overview
Problem
Existing circular combs for combing machines face challenges with high mass and moment of inertia due to discontinuous rotary motion, leading to increased stress on the drive unit and potential vibrations, which can reduce service life and limit adjustability of the combing process.
Innovation Solution
A circular comb design featuring a hollow profile base body with a semicircular trough supporting the combing set on the shaft, combined with a support element and mass balancing element, allows for precise adjustment of the enveloping circle radius and reduced mass moment of inertia, using fastening means and spacer elements for optimal support and alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the circular comb carrier is manufactured as a cast part with additional mass on the opposite side of the comb segment, then mass balance is achieved, but the circular comb carrier has large and heavy mass which increases stress on the drive unit and can lead to vibrations
Solution Approach 1:
The circular comb carrier is segmented into a base body and a separate combing segment that can be detached and exchanged. The base body is designed as a hollow profile structure with reduced mass, while the combing segment contains the necessary combing elements. This segmentation allows the main carrier structure to be lightweight while still achieving mass balance through the separate segment design.
Solution Approach 2:
A separate counterweight element is introduced as an independent component that can be attached to or exchanged with the combing segment. This counterweight is specifically designed to balance the mass of the combing segment, allowing the base body to be constructed with minimal mass while maintaining overall mass balance for smooth operation during discontinuous rotary motion.
2Manufacturing precision
If the base body is made solid to ensure dimensional accuracy in the central area, then the combing ratios remain constant, but the mass moment of inertia becomes very large which negatively affects energy consumption and bearing points
Solution Approach 1:
The base body is designed with non-uniform structure where the hollow profile provides sufficient rigidity and dimensional accuracy only in the areas where it is structurally necessary. The hollow sections are positioned to maintain precision where combing ratios must be constant, while minimizing mass in areas that contribute to moment of inertia. This local optimization allows reduced overall mass while preserving critical dimensional accuracy.
3Productivity
If discontinuous rotary motion is used to adapt the system to the combing process, then productivity increases with higher comb cycle numbers, but the drive unit experiences additional stress during acceleration and deceleration
Solution Approach 1:
The counterweight is specifically designed to balance the rotating mass of the combing segment, creating a mass-balanced system that reduces centrifugal forces and vibrations during discontinuous rotary motion. This mass balancing minimizes the stress on the drive unit during acceleration and deceleration phases, enabling higher comb cycle numbers to be achieved without excessive mechanical stress.
Data Source
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AI summary
The invention relates to a circular comb for a combing machine. The circular comb has a base body formed by a hollow section bar. The base body is provided with combing needle cloth on an outer circular section and is fixed to a shaft in a fixing and rotation manner, wherein when observing from the radial direction of the shaft, a mass balance element is fixed on a side surface, opposite to the combing needle cloth, of the shaft. The invention aims to improve known designs and guarantees the easy adjustment of envelope circle radius of the combing needle cloth. The base body is provided with an inner section protruding toward the shaft, the inner section is provided with a recess opening in the direction of the shaft and extending in the longitudinal direction of the hollow section bar, and the recessing receiving a support element. The support element is supported on the bottom of the recess by a first support surface and is supported on the periphery of the shaft by a second support surface. A fixing device is arranged, and the base body is vertical to the longitudinal direction of the shaft and is clamped with the shaft through the support element and the mass balance element.