Hem Winder with Segmented Mandrels for Fast Ejection
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Solution Overview
Problem
Conventional seam winders face issues with mechanical stability at high strip speeds and prolonged non-productive times during the ejection of finished seam rolls, due to structural complexity and limited adjustability of winding mandrels.
Innovation Solution
A seam winder design featuring two coaxially arranged winding mandrels with separate displacement bases, allowing for high-speed axial displacement and robust bearing, along with independent drive units for each mandrel, enabling efficient and reliable winding and quick ejection of hem bales.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single overhung winding mandrel is used, then the device structure is simplified, but the mandrel travel distance becomes long resulting in prolonged non-productive time for ejection
Solution Approach 1:
The single winding mandrel is segmented into two separate winding mandrels (first and second winding mandrels) that can operate independently. This segmentation allows one mandrel to be in the winding position while the other is in the ejection position, effectively halving the non-productive time for mandrel travel and enabling parallel operation cycles.
Solution Approach 2:
The winding mandrels are mounted on displacement bases that can be dynamically positioned between winding position and ejection position. This dynamic repositioning capability allows the system to optimize the mandrel travel distance and timing, reducing non-productive time while maintaining operational flexibility.
2Ease of operation
If adjustment cylinders are used to displace winding mandrels axially, then the mandrels can be positioned, but the displacement speed is limited resulting in prolonged non-productive time
Solution Approach 1:
Adjustment cylinders are used to provide rapid axial displacement of the displacement bases and mounted winding mandrels. The pneumatic or hydraulic actuation enables high-speed positioning compared to mechanical alternatives, significantly reducing the non-productive time for mandrel ejection while maintaining precise positioning capability.
3Device complexity
If winding mandrels are mounted on a shared base, then the structure is simplified, but mechanical stability at high strip speeds is insufficient
Solution Approach 1:
The shared base structure is segmented into separate displacement bases for each winding mandrel. Each displacement base independently supports and positions its associated winding mandrel, providing enhanced mechanical stability and vibration resistance at high strip speeds while maintaining structural simplicity through modular design.
Solution Approach 2:
Each displacement base is specifically designed and optimized for its local function of supporting and positioning a single winding mandrel. This localized optimization allows each base to be tailored for high-speed stability and precision, improving overall mechanical reliability without requiring complex global structural changes.
4Adaptability or versatility
If telescopic couplings are used to connect drive units to winding mandrels, then adjustment is possible, but the device structure becomes complex
Solution Approach 1:
The drive units are mounted directly on the displacement bases, creating a dynamic connection that moves with the displacement base. This eliminates the need for static telescopic couplings while maintaining full adjustability, as the drive unit position adjusts automatically with the displacement base movement, simplifying the overall coupling mechanism.
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 design ensures operational reliability at high speeds, reduces non-productive times, and prevents jamming during ejection, while maintaining uniform winding quality and eliminating the need for complex telescopic couplings.
Implementation Method 1
The winding mandrels are supported by bearing devices in a non-positive, frictional manner
Implementation Method 2
separate displacement bases (22, 23), allowing for high-speed axial displacement
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The invention relates to a hem winder (10) for strip-shaped material, comprising two winding mandrels (14, 15) which are rotatably mounted about the longitudinal axis thereof (12) and which are arranged coaxially to each other in the longitudinal axis thereof (12) and can be moved axially with respect to each other, and a winding segment (16) in which the respectively free front sides (18, 19) of the winding mandrel (14, 15) can be brought into an opposing position. At least one winding mandrel (14, 15) is mounted on a movement base (22, 23) which can be moved with respect to a base frame (20).