Adjustable Sieve Opening Mechanism for Wood Chipper Screening
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Solution Overview
Problem
Existing wood chipping devices require replacing the entire screening device to accommodate different wood chip sizes, which is time-consuming and complex due to the lack of adjustable sieve openings.
Innovation Solution
An adjustable screening device with a frame featuring first and second sieve openings of varying sizes, controlled by a rotating mechanism that allows for reversible adjustment between states, enabling the sieving of wood chips of different sizes without replacing the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single sieve opening size is used in the screening device, then the device structure is simple, but the device cannot screen multiple wood chip sizes and requires replacement for different screening tasks
Solution Approach 1:
The patent applies the dynamics principle by making the sieve opening size adjustable rather than fixed. The screening device can dynamically change its sieve opening dimensions between a first size (for larger wood chips) and a second size (for smaller wood chips) through a mechanism that rotates dividing elements into different positions, allowing one device to adapt to multiple screening requirements without replacement
Solution Approach 2:
The patent implements universality by designing a single screening device that can perform multiple screening functions. By incorporating adjustable dividing elements that can create different sieve opening configurations, the device serves as a universal screening solution capable of handling various wood chip sizes (e.g., P45, P63, P16 qualities) without requiring separate dedicated devices for each chip size
2Productivity
If the entire screening device is replaced to screen different wood chip sizes, then the screening accuracy is maintained, but the operation becomes time-consuming and cumbersome
Solution Approach 1:
The dynamics principle resolves this contradiction by enabling rapid adjustment of sieve opening size through rotation of dividing elements along circular paths. This dynamic adjustment mechanism allows operators to switch between different screening configurations (first sieve opening size for P45/P63 quality, second sieve opening size for P16 quality) in minutes rather than requiring full device replacement, significantly improving productivity while maintaining screening accuracy
Solution Approach 2:
The preliminary action principle is applied by pre-configuring the dividing elements with specific geometries and attachment mechanisms that enable quick repositioning. The dividing elements are designed beforehand with features that allow them to be rotated into predetermined positions corresponding to different sieve opening sizes, eliminating the need for complex on-site adjustments or complete device replacements during operation
3Adaptability or versatility
If dividing elements are rotated to change sieve opening size, then the device becomes adjustable for different chip sizes, but the mechanism complexity increases
Solution Approach 1:
The segmentation principle is applied by dividing the screening device into modular components: a frame with longitudinal and transverse struts, multiple independent dividing elements, and rotating shafts for each row of sieve openings. This segmentation allows each component to be independently adjusted and maintained, reducing the overall complexity management while enabling versatile adjustment capabilities across different screening configurations
Data Source
Figure 1A~1B
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AI summary
Adjustable sieve device (50) for a wood chipper (10) for sifting wood chips of at least two different chip sizes, the sieve device (50) comprising: - a frame (100) having several first sieve openings (200) with a first sieve opening size (200a), which first sieve openings (200) are arranged in rows and columns on the frame (100), - a sieve opening division device (300) which can be moved into a first state (P1) and a second state (P2) by means of an adjustment mechanism (400), wherein - in the first state (P1) the first sieve openings (200) have the first sieve opening size (200a) so that wood chips up to a first chip size can be sifted through the first sieve openings (200), and wherein - in the second state (P2) second sieve openings (500) have a second sieve opening size (500a) so that wood chips up to a second chip size can be sieved through the second sieve openings (500),where the second sieve opening size (500a) is smaller than the first sieve opening size (200a).