Cutter Device Spherical Torque Transmission
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Solution Overview
Problem
Existing cutter devices face challenges in transmitting large torque due to the use of point contact or line contact in torque transmission, leading to breakage, deformation, and reduced lifespan of components, which affects the accuracy and reliability of pelletization.
Innovation Solution
The cutter device employs surface contact through a spherical structure with truncated-cone-like shapes and surface treatment to reduce friction, allowing for efficient transmission of large rotary torque while maintaining alignment between the die and cutter blade.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If point contact or line contact is used for torque transmission in the cardan joint, then the device complexity is reduced, but the torque transmission capacity is limited and component lifespan is reduced due to breakage and deformation
Solution Approach 1:
The patent applies spheroidality by using spherical contact surfaces between the support pins and fitting holes. The outer circumferential surfaces of the support pins and the inner circumferential surfaces of the fitting holes are both formed as spherical surfaces, enabling surface contact instead of point or line contact. This curved surface geometry increases the contact area, allowing for higher torque transmission capacity while distributing stress evenly to prevent breakage and deformation of components.
2Manufacturing precision
If accuracy adjustment is performed between the die surface and cutter shaft before operation, then the initial parallelism is improved, but the time consumption increases and the parallelism may still change due to temperature variations
Solution Approach 1:
The patent applies dynamics by making the cutter holder movable relative to the cutter shaft through the cardan joint mechanism. The support pins can rotate and adjust within the fitting holes, allowing the cutter holder to dynamically adapt to temperature-induced dimensional changes. This dynamic adjustment capability maintains parallelism during operation without requiring frequent manual adjustments, thereby reducing time loss while preserving manufacturing precision.
Solution Approach 2:
The patent applies parameter changes by allowing the geometric parameters of the cutter holder position to change automatically in response to temperature variations. The spherical contact surfaces enable small angular adjustments and positional shifts that compensate for thermal expansion or contraction, maintaining the parallelism parameter between the die surface and cutter blade despite environmental parameter changes.
3Manufacturing precision
If spherical elements are used to provide aligning function, then the parallelism maintenance is improved, but the torque transmission capability is insufficient for large torque applications
Solution Approach 1:
The patent combines spheroidality with increased contact area by using spherical surfaces with sufficient radius and contact area. The outer circumferential surfaces of the support pins and inner circumferential surfaces of the fitting holes are formed as spherical surfaces with appropriate dimensions. This spherical geometry provides the aligning function for parallelism maintenance while the increased surface area and optimized dimensions enable the structure to transmit large torque without failure.
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
A cutter device includes a fixing holder, a spherical cylinder, and a cutter holder. The fixing holder has a through hole, and a spherical outer circumferential surface in which a key groove is formed. The spherical cylinder includes a through hole that has a spherical inner circumferential surface in which a key groove having a spherical bottom surface is formed, and a spherical outer circumferential surface having a key groove formed at a position shifted around a rotational axis with respect to the key groove. The cutter holder includes a through hole that has a spherical inner circumferential surface in which a through hole having a spherical bottom surface is formed, and a cutter blade. These components are rotationally slidably connected by keys.