Segmented Rope Drum Fastening for Greenhouse Shaft Positioning
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Solution Overview
Problem
The assembly and positioning of cable drums on shafts for energy or shading screens in greenhouses require a high level of effort, making it difficult to simplify the process.
Innovation Solution
A cable pulley device with multiple partial shells and fastening device parts that allow for detachable connection and axial displacement, enabling easy positioning and rotational fixing of the cable drum on a shaft, using fastening brackets, retaining clips, or locking screws for secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional single-piece cable drum design is used, then the structural integrity is maintained, but the assembly and positioning on the shaft requires high effort and complexity
Solution Approach 1:
The cable drum is divided into multiple partial shells (first partial shell, second partial shell, etc.) that can be assembled around the shaft. This segmentation allows the cable drum to be positioned on the shaft in discrete steps, reducing assembly effort while maintaining structural integrity through the coordinated fastening of multiple parts.
Solution Approach 2:
The fastening device incorporates adjustable fastening elements that can be positioned at different locations along the shaft. This dynamic positioning capability allows the cable drum to be securely fastened at various positions without requiring complex predefined mounting structures, thereby reducing overall assembly complexity.
2Manufacturing precision
If the cable drum is designed as a single rigid piece, then manufacturing is simpler, but positioning precision on the shaft is reduced
Solution Approach 1:
By dividing the cable drum into multiple partial shells with fastening elements, the system achieves precise positioning on the shaft. Each partial shell can be manufactured with standard tolerances, but when assembled with the fastening device, they achieve high positioning precision that would be difficult to obtain with a single-piece design.
Solution Approach 2:
The fastening device incorporates specific fastening elements at particular locations on the partial shells, creating localized high-precision features. This allows the majority of the cable drum structure to be manufactured with standard tolerances, while only the critical fastening areas require high precision, balancing manufacturing complexity with positioning accuracy.
3Reliability
If the cable drum is firmly fixed to the shaft, then rotational stability is achieved, but adjustment and repositioning becomes difficult
Solution Approach 1:
The fastening device is designed with adjustable fastening elements that can be easily engaged and disengaged. This allows the cable drum to be firmly fixed when needed for rotational stability, but also easily repositioned or adjusted by simply releasing the fastening elements, providing operational flexibility without compromising reliability during operation.
Solution Approach 2:
The detachable nature of the fastening device allows for easy disassembly and reassembly of the cable drum on the shaft. The fastening elements can be quickly released and re-engaged at different positions, enabling maintenance, adjustment, or reconfiguration without permanent fixation, thus balancing rotational stability with repositioning ease.
Data Source
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AI summary
The device (1) has a rope drum (2) for receiving and winding rope. A fixing device (3) fixes the rope drum to a shaft (4). The rope drum is formed from partial shells (2a, 2b). The fixing device has two fixing device parts (3a, 3b) at two sides (2', 2'') of the rope drum. The fixing device parts are connected with one of the partial shells. The fixing device parts are connected with each other in an assembled condition of the partial shells. The partial shells are flexibly connected with each other over a connection region between the fixing device parts. An independent claim is also included for a method for producing a connecting arrangement.