Adjustable Charging Cam Elements for Rotary Press Filling
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Solution Overview
Problem
In rotary presses, varying the filling depth of powder in bores to achieve precise compact weights is challenging due to clogging and lumping issues, requiring frequent changes of charging cams, which disrupts production and is time-consuming.
Innovation Solution
A device with adjustable charging-cam elements, including a first press-mounted cam with a continuous filling-cam portion and a second cam with adjustable height and circumferential position, allowing smooth variation of filling depth without the need for cam exchanges, using helically shaped cam portions for seamless transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a charging cam with a large adjustable depth is chosen to achieve a major filling volume, then the filling depth can be increased, but the proportioning cam must make large batching-out strokes which cause powder clogging, compression, and lumping problems
Solution Approach 1:
The charging cam is divided into two separate elements: a first press-mounted charging-cam element with a first filling-cam portion and a second adjustable charging-cam element with a second filling-cam portion. This segmentation allows the filling depth to be adjusted by positioning the second element at different heights on the first element, enabling precise control of filling volume without requiring large batching-out strokes that cause powder problems.
2Productivity
If the rotor speed is increased to increase tablet output, then productivity is improved, but the remaining filling time becomes too small to completely fill the bore with powder
Solution Approach 1:
The second charging-cam element is made adjustable in height relative to the first charging-cam element, allowing the filling depth to be dynamically adapted. When rotor speed increases and filling time decreases, the filling depth can be increased by adjusting the second cam element's position, ensuring the bore is completely filled and precise filling volume is achieved despite the reduced time available.
3Manufacturing precision
If the filling depth is increased to give the compact its desired weight at high speeds, then the compact weight accuracy is improved, but it requires exchanging the charging cam which involves great expenditure in assembly and time
Solution Approach 1:
The second charging-cam element is designed to be adjustable in height on the first charging-cam element, allowing the filling depth to be varied by simply repositioning the second element rather than exchanging the entire charging cam assembly. This dynamic adjustment capability maintains compact weight accuracy while eliminating the time-consuming cam exchange process and associated production disruptions.
4Device complexity
If a fixed charging cam is used to simplify the device structure, then the device complexity is reduced, but the adaptability to vary filling depth is lost
Solution Approach 1:
The charging cam system incorporates a second charging-cam element that can be adjusted in height on the first charging-cam element, providing filling depth variability. The adjustment mechanism includes guide means that constrain the second element to move along a predetermined path, maintaining relatively simple device structure while enabling the adaptability needed to vary filling depth according to production requirements.
Data Source
AI summary
A device for the guidance of lower rams across the lower-ram head in a rotor-type rotary press in the area of a filling device wherein a charging cam is disposed between an ejector cam which precedes as viewed in the direction of production and a proportioning cam adjustable in height and is configured such as to lower the heads of the lower rams revolving along with the rotor from the level at the end of the ejector cam to a lower-located transition level of the proportioning cam, a press-mounted, first charging-cam element having a first filling-cam portion joining the ejector cam is provided on which the lower-ram heads are guided solely on the side facing the rotor axis subsequent to the ejector cam, an adjustable second charging-cam element is provided and has a second filling-cam portion on which the lower-ram heads are guided solely on the side facing away from the rotor axis before encountering the proportioning cam, that the second charging-cam element is displaceable both vertically and in the circumferential direction of the rotor for the purpose of varying the filling depth along a predetermined adjustable upward slope, and the first and second charging-cam elements have third, helically shaped filling-cam portions which are located between the first and the second charging cam portion and are located partially opposite each other, and guide the lower-ram heads jointly through a certain length, wherein the upward slope of the third filling-cam portions matches with the adjustable upward slope.