Cutting Blade Vacuum Fixing Mechanism for Rapid Replacement
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Solution Overview
Problem
Conventional cutting apparatuses require high torque to remove the nut for replacing the cutting blade, reducing production efficiency due to frequent blade wear or chipping.
Innovation Solution
A cutting apparatus with a support flange featuring a suction hole and communication hole connected to a vacuum source through a rotary joint, allowing for vacuum fixation of the cutting blade between the support and fixing flanges, and fine asperities for improved friction, enabling easy replacement of the cutting blade.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a nut is threadedly engaged with the external screw thread of the support flange to fix the cutting blade, then the cutting blade is firmly held during cutting operation, but large torque is required to remove the nut for blade replacement
Solution Approach 1:
The patent replaces the mechanical screw-nut fastening system with a vacuum suction system. The support flange includes suction holes that connect to a vacuum source, creating a vacuum field that holds the cutting blade against the support flange without requiring mechanical fasteners. This substitution eliminates the need for high-torque nut removal while maintaining secure fixation during cutting operations.
Solution Approach 2:
The patent uses vacuum suction (a pneumatic principle) to fix the cutting blade. The support flange is equipped with suction holes that, when connected to a vacuum source, create negative pressure to hold the cutting blade firmly in place. This pneumatic fixation method allows for easy blade replacement by simply releasing the vacuum, avoiding the need to unscrew tight fasteners.
2Reliability
If the spiral structure of the screw threads is reverse to the rotational direction of the spindle to prevent loosening, then the nut is firmly tightened during cutting operation, but large torque is required to remove the nut
Solution Approach 1:
The patent replaces the mechanical screw thread anti-loosening mechanism with a vacuum suction system. The vacuum field provides continuous holding force during cutting operations without relying on friction or spiral thread geometry, ensuring reliability while allowing rapid blade replacement by simply releasing the vacuum, thus maintaining high production efficiency.
Solution Approach 2:
The patent uses vacuum suction to provide reliable fixation during cutting operations. The vacuum field maintains constant holding force independent of spindle rotation, eliminating the need for reverse-spiral thread designs. Blade replacement is achieved by releasing the vacuum, enabling quick changes without the productivity loss associated with removing tightly fastened nuts.
3Reliability
If fine asperities are formed on the annular supporting surface to improve friction, then the cutting blade is held more securely, but the complexity of manufacturing increases
Solution Approach 1:
The patent uses vacuum suction through suction holes in the support flange to hold the cutting blade securely. This pneumatic approach provides reliable blade holding without requiring complex surface treatments like fine asperities. The manufacturing process is simplified to only requiring the formation of suction holes, which is less complex than creating precise surface asperity patterns while achieving secure blade fixation.
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
The vacuum fixation method allows for efficient and stable attachment and detachment of the cutting blade, reducing the torque required for blade replacement and enhancing production efficiency.
Implementation Method 1
a reduced pressure is applied between the support flange and the fixing flange to suck the fixing flange toward the support flange, thereby fixing the cutting blade between the support flange and the fixing flange
Implementation Method 2
at least the annular supporting surface of the support flange being formed with fine asperities for improving the friction to the cutting blade
Data Source
AI summary
A cutting unit includes a spindle, a spindle housing, a support flange on the front of the spindle, a cutting blade detachably supported to the support flange, and a fixing flange for fixing the cutting blade to the support flange. The support flange includes a boss portion adapted to be inserted through a central opening of the cutting blade, a flange portion for supporting one side surface of the cutting blade, and a cylindrical portion for engaging the front of the spindle. The flange portion has a suction hole opening toward the fixing flange, and the cylindrical portion has a communication hole communicating with the suction hole. The communication hole is connected to a vacuum source through a rotary joint fixed to the spindle housing so that communication between the communication hole and the vacuum source is selectively made by an on-off valve.