Rotary Welding Unit Layout for Fast Weld Spacing Changes
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Solution Overview
Problem
Existing rotary welding devices require manual intervention for changing the weld spacing, leading to time-consuming operations and improper tensioning of the continuous web during format changes.
Innovation Solution
A rotary welding device with movable welding units and supporting elements that adjust radially to vary the weld spacing automatically, allowing continuous web tensioning without manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If manual intervention is used to change weld spacing by removing and reassembling parts, then the weld spacing can be varied, but the operation becomes extremely time-consuming and requires cutting and rewinding the continuous web
Solution Approach 1:
The patent implements a movable supporting element that can dynamically adjust its radial position relative to the rotary means. This dynamic adjustment allows the working circumference to be varied without manual disassembly, enabling quick format changes by simply moving the supporting element to different radial positions where pre-positioned welding units are located.
Solution Approach 2:
The system enables automatic format changeover where the supporting element itself performs the adjustment function. The element can be moved to different positions to select different weld spacings without requiring external manual intervention, cutting, or rewinding operations, making the system self-sufficient for format variations.
2Adaptability or versatility
If parts are removed manually during format changeover, then the weld spacing can be changed, but the continuous web must be cut and rewound which is extremely time-consuming
Solution Approach 1:
The supporting element is designed to be movable rather than fixed, allowing it to adapt to different radial positions corresponding to different format requirements. This eliminates the need to stop production for manual reconfiguration, maintaining continuous operation and high productivity.
Solution Approach 2:
Multiple welding units are pre-positioned at different radial distances from the axis of rotation. When a format change is needed, the supporting element is simply moved to the position where the desired welding units are located, rather than having to assemble new components. This preliminary positioning of multiple welding units enables instant format switching.
3Adaptability or versatility
If the working circumference is varied manually, then different weld spacings are achieved, but manual intervention is required which slows down operations
Solution Approach 1:
The supporting element is equipped with means to move itself to different radial positions, eliminating the need for manual intervention. The element can autonomously adjust to the correct position for the desired weld spacing, making the operation simple and fast.
Solution Approach 2:
The movable supporting element acts as an intermediary between the control system and the welding units. By moving this intermediate element, the working circumference is adjusted indirectly, which simplifies the operation compared to directly manipulating multiple welding units or reconfiguring the entire system.
Data Source
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AI summary
A rotary device for welding a continuous web comprises a rotary means (2) rotating about a respective axis of rotation (2a), a plurality of welding units (3) for welding the continuous web (4) and mounted on the rotary means (2) in such a way as to be angularly spaced from each other; movement means (5) are configured to vary the radial position of the welding units (3) by moving them towards or away from the axis of rotation (2a) of the rotary means (2); at least one first supporting element (6) and at least one second supporting element (7) for supporting the continuous web (4) and disposed, respectively, upstream and downstream of the same welding unit (3) with reference to the rotation direction of the rotary means (2), to keep the continuous web (4) tensioned when the welding unit (3) is at the operating position; the first supporting elements (6) and the second supporting elements (7) associated with the respective welding units (3) are supported by a load-bearing structure (8) connected to the welding units (3) in such a way that a radial movement of the welding units (3) corresponds to a movement of the first supporting elements (6) and of the second supporting elements (7) towards and away from the axis of rotation (2a) of the rotary means (2).