Reciprocating Kneader Gearbox with Adjustable Eccentric
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Solution Overview
Problem
Reciprocating kneaders are inflexible due to a lack of suitable gearboxes that allow for easy adjustment of stroke ratio and length, leading to potential collisions between screw flights and pins when rotation and oscillation are not synchronized, limiting their application versatility.
Innovation Solution
A gearbox design with a single drive mechanism that includes an adjustable eccentric, allowing for invariant stroke ratio and adjustable stroke length, ensuring synchronized rotation and oscillation, thereby preventing collisions and enabling flexibility in screw and pin combinations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reciprocating kneader is designed for a specific application with fixed stroke ratio and length, then the rotation and oscillation are synchronized to prevent collisions, but the device lacks flexibility to accommodate different screw and pin combinations
Solution Approach 1:
The patent applies the dynamics principle by making the stroke ratio adjustable through a variable gear ratio mechanism. The gear box allows the stroke ratio to be changed dynamically to match different screw and pin combinations while maintaining synchronization. This resolves the contradiction by enabling the system to adapt its parameters rather than being fixed, thus achieving both reliability through proper synchronization and versatility through adjustable configurations.
Solution Approach 2:
The patent implements parameter changes by allowing the stroke ratio and stroke length to be modified through the adjustable gear box mechanism. By changing the gear ratio parameters, the system can accommodate different screw and pin combinations while maintaining the critical synchronization between rotation and oscillation. This enables versatility without sacrificing the reliability of synchronized motion.
2Ease of manufacture
If separate drive mechanisms are used for rotation and oscillation, then the device can be simpler to manufacture, but the synchronous motion is lost leading to catastrophic collisions
Solution Approach 1:
The patent applies the merging principle by combining the rotation and oscillation drive mechanisms into a single integrated gear box system. The single drive mechanism drives both the rotational motion and the oscillatory motion through interconnected gears, ensuring that both motions remain synchronized. This resolves the contradiction by maintaining reliability through unified drive while keeping the manufacturing relatively simple through the integrated design.
Solution Approach 2:
The gear box acts as an intermediary mechanism that translates a single rotational input into both rotational and oscillatory outputs in proper synchronization. The gear train serves as the mediator that coordinates the two different types of motion, ensuring they remain synchronized without requiring separate drive mechanisms. This achieves reliability through proper coordination while maintaining manufacturing simplicity.
3Ease of manufacture
If the stroke length is fixed in the gear box design, then the manufacturing is simpler, but the device cannot accommodate manufacturing tolerances and different applications
Solution Approach 1:
The patent applies the dynamics principle by making the stroke length adjustable through a mechanism that allows modification of the eccentricity or gear configuration. This enables the gear box to adapt to different applications and compensate for manufacturing tolerances while maintaining a relatively simple base design. The adjustability is achieved through movable or interchangeable components rather than a completely complex fixed design.
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 gearbox allows for fine-tuning of stroke length and ratio, ensuring constant correlation of rotation and oscillation, preventing catastrophic contact between flights and pins, and enabling the kneader to be used with various screw and pin combinations, enhancing its application versatility.
Implementation Method 1
An adjustable eccentric is coupled to the secondary oscillation gear wherein the adjustable eccentric rotates in concert with the secondary oscillation gear
Data Source
AI summary
A method and apparatus for a reciprocating kneader. A primary rotational gear is attached to a gear box primary shaft and rotates in concert therewith and engages a secondary rotational gear. The primary rotational gear drive provides a primary source of rotation for a kneading screw and for the secondary gear as a secondary source of rotation. An adjustable eccentric is coupled to the secondary oscillation gear and rotates in concert therewith for reciprocation motion.