Milling Drum Clamping Structure for Secure Torque Transmission
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Solution Overview
Problem
Existing hand milling machines face challenges in achieving an effective and secure connection and power transmission between the machine and tool, leading to inefficiencies and operator errors during surface processing tasks like milling or grinding.
Innovation Solution
A hand milling machine design featuring a tool carrier with a connecting element and clamping device that ensures a positive, torque-transmitting connection between the tool and drive, including projections for secure attachment and a clamping mechanism with a foldable handle for easy tool changes, along with a housing for safety and tool accessibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple connection between tool carrier and tool is used, then device complexity is reduced, but torque transmission effectiveness deteriorates
Solution Approach 1:
The connecting element features an asymmetric design with a projection on the tool carrier that fits into a corresponding recess on the tool. This asymmetric geometry ensures unidirectional torque transmission while preventing reverse rotation, achieving effective power transfer without complex mechanical structures
Solution Approach 2:
The connecting element acts as an intermediary component between the tool carrier and the tool. It provides a positive mechanical engagement through its projection-recess interface, enabling reliable torque transmission while keeping both the tool carrier and tool designs relatively simple
2Reliability
If a secure clamping connection is implemented, then reliability of tool attachment is improved, but ease of operation for tool changes deteriorates
Solution Approach 1:
The connection system is segmented into distinct functional elements: the connecting element for positive engagement, the clamping device for axial securing, and the foldable handle for operation. This segmentation allows each component to perform its specific function efficiently while enabling quick tool changes through the detachable handle mechanism
Solution Approach 2:
The foldable handle on the clamping device provides dynamic operation capability. The handle can be folded during tool changes to clear the workspace, and unfolded during clamping to provide leverage. This dynamic configuration improves ease of operation without compromising the reliability of the clamped connection
3Power
If the connecting element has multiple projections, then torque transmission is improved, but device complexity increases
Solution Approach 1:
The connecting element features multiple projections distributed around its circumference, with each projection locally engaged in a corresponding recess. This local distribution of engagement points increases torque transmission capacity without requiring a complete redesign of the entire connecting element structure
Data Source
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AI summary
A hand-operated cutting machine, in particular a hand-operated milling machine (100) for processing a surface of a floor or a wall, comprises a drive, a tool carrier (40) for receiving a tool (60) rotatable about a tool axis (Aw) and extending along the tool axis (Aw), a first end (41) facing the drive, a second end (42) facing away from the drive, a circumferential surface (43) and at least one connecting element (44) arranged at the first end (41) for positively engaging the tool (60) at least in the circumferential direction (U), and to which the drive transmits a torque to generate a rotation of the tool carrier (40) in the circumferential direction (U); and a clamping device (45) for clamping the tool carrier (40) and the tool (60) against the cutting machine in the direction of the tool axis (Aw).