Multi-shaft kneading machine gate rod design for channel limitation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing multi-shaft kneading machines, such as those described in JP2000-309018A, fail to sufficiently limit the channel area at the minimum degree-of-opening position due to the radius of curvature of the channel forming surface being larger than that of the first contact surface, resulting in regions where the channel cannot be closed, and thus, insufficient adjustment of the kneading degree.
Innovation Solution
The multi-shaft kneading machine incorporates gate rods with small diameter parts having a radius of curvature equal to half the distance between the second axes of rotation, allowing the first contact surfaces to be positioned closer together when rotated to the minimum degree-of-opening position, thereby reducing the channel area effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the channel forming surface has a larger radius of curvature than the first contact surface, then the gate rod structure is simpler and easier to manufacture, but the channel cannot be sufficiently limited at the minimum degree-of-opening position, resulting in insufficient kneading adjustment range
Solution Approach 1:
The gate rod is segmented into two distinct parts: a large diameter part for structural support and a small diameter part for precise channel limitation. This segmentation allows each part to fulfill its specific function optimally, resolving the contradiction between structural simplicity and precision control.
Solution Approach 2:
Different parts of the gate rod are given different local qualities - the large diameter part provides structural stability while the small diameter part provides precise geometric control for channel limitation. This local differentiation enables the gate rod to achieve both ease of manufacture and precise channel limitation.
2Strength
If the first contact surfaces are positioned far apart, then the gate rod structure is more stable, but the channel area cannot be minimized sufficiently, limiting the kneading adjustment range
Solution Approach 1:
By dividing the gate rod into large and small diameter parts, the structure maintains stability through the large diameter part while achieving close positioning of contact surfaces through the small diameter part, thus resolving the contradiction between stability and adjustment range.
Solution Approach 2:
The solution transitions from a uniform cylindrical structure to a multi-dimensional structure with varying diameters along the gate rod's length, enabling simultaneous achievement of structural stability and precise channel limitation.
3Device complexity
If the channel area is not sufficiently limited, then the gate rod design is simpler, but the degree of kneading cannot be adjusted sufficiently, reducing processing effectiveness
Solution Approach 1:
The segmented design with small diameter parts enables effective channel limitation without requiring complex overall gate rod design, maintaining simplicity while improving processing effectiveness through localized geometric optimization.
Data Source
AI summary
A multi-shaft kneading machine includes a channel and two screws rotatable around first axes of rotation. A pair of gate rods sandwich the two screws and are rotatable around second axes of rotation. Each of the pair of gate rods has two recess parts that form respective spaces through which the two screws penetrate. Each of the pair of gate rods has a first contact surface, which comes into surface contact with a screw when a gate rod is rotated to a minimum degree-of-opening position. Large diameter parts are fitted into the groove of the cylinder, and a small diameter part have a radius of curvature equal to half a distance between two second axes of rotation and smaller than a radius of curvature of the large diameter parts. The small diameter parts of the pair of gate rods are in contact with each other.