Rotary Tablet Press Rotor Clamping Mechanism
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Solution Overview
Problem
Rotary tablet presses have complex structures with mechanically movable parts, leading to dust deposition issues and require complex tensioning mechanisms, making maintenance, cleaning, and rotor replacement cumbersome.
Innovation Solution
A rotary tablet press design with a rotor detachably connected to the drive shaft via a non-positive clamping device integrated into the rotor, featuring a pull rod for easy release and self-adjusting clamping elements, eliminating the need for a complex tensioning mechanism in the main shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If a complex tensioning mechanism is integrated into the main shaft to enable rotor detachment, then the rotor can be removed for maintenance and cleaning, but the device complexity increases and dust deposition points increase
Solution Approach 1:
The clamping device is extracted from the main shaft and integrated into the rotor itself. The rotor includes a pull rod with a clamping element that can be actuated from the rotor periphery, eliminating the need for complex tensioning mechanisms in the main shaft. This extraction simplifies the main shaft structure while maintaining rotor detachability for maintenance.
Solution Approach 2:
A pull rod is introduced as an intermediary element that transmits the removal force from the rotor periphery to the clamping jaws. The pull rod acts as a mediator that enables remote actuation of the clamping device without requiring direct mechanical linkages through the main shaft, thereby reducing complexity and dust deposition points.
2Ease of repair
If mechanically movable parts are added to the drive shaft for rotor detachment, then the rotor can be removed for maintenance, but dust deposition points increase within the drive device
Solution Approach 1:
The clamping mechanism is extracted from the drive shaft interior and relocated to the rotor. The clamping jaws and actuating elements are now part of the rotor structure, eliminating internal movable parts in the drive shaft that would create dust traps. This maintains rotor removability while eliminating dust deposition points in the drive mechanism.
3Ease of operation
If a clamping device is integrated into the rotor with an actuating element, then the rotor can be easily removed and reinstalled, but the rotor structure becomes more complex
Solution Approach 1:
The clamping element is nested within the pull rod structure, which itself is integrated into the rotor. The clamping jaws are positioned within the rotor body and actuate radially outward when the pull rod is pulled. This nested arrangement minimizes the space required and reduces the apparent complexity of the rotor structure while enabling easy rotor replacement.
4Adaptability or versatility
If the clamping device is non-positively connected to the drive shaft, then the rotor can be detachably connected without extensive dismantling, but the connection stability may be reduced
Solution Approach 1:
The clamping jaws are designed with asymmetric geometry that provides strong radial clamping force when engaged with the drive shaft, ensuring stable connection during operation. The asymmetric shape allows for easy release when axial force is applied to the pull rod, enabling detachability. This asymmetric design achieves both connection stability and easy detachment without requiring positive mechanical interlocking.
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
Enables quick, safe, and reversible rotor replacement without extensive dismantling, reducing dust accumulation and simplifying maintenance by integrating the clamping device within the rotor, allowing for easy addition of functionality without interfering with existing machinery.
Implementation Method 1
a spring element (44) which acts on the clamping element (38) and is arranged within the rotor (12)
Implementation Method 2
The rotor (12) includes a pull rod (32) by means of which the clamping element (38) can be displaced from a clamping position via a dead center position into a release position
Data Source
Figure 1
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AI summary
The tablet press (10) has a rotor (12), and a prime mover for the rotor, where the rotor is effectively connected with a drive shaft of the prime mover. The rotor is detachably connected with the drive shaft by a clamping device (26) i.e. quick-clamping device, in a form fit and/or force fit manner. The clamping device is integrated into the rotor, and has two clamping elements (38) that are displaced from a clamping position into a release position over a dead center position. The clamping elements are arranged around a rotation axis (30) of the rotor.