Finger Screen With Staggered Rows For Blockage Resistance
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Solution Overview
Problem
Conventional finger screens have a suboptimal gap widening course between spreading screen fingers, leading to inefficiencies in screening difficult materials that often result in screen blockages.
Innovation Solution
The finger sieve design features a larger height offset and spread angle of adjacent fingers, with the intersection of their axes lying outside the traverse, and includes two height-staggered rows of fingers, allowing for improved vibration and natural frequency, potentially eliminating the need for a vibration drive.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the height offset and spread angle of adjacent fingers are increased, then the gap widening course is improved and screen blockages are reduced, but the traverse width increases
Solution Approach 1:
The patent applies dimensionality change by arranging fingers in multiple height-staggered rows (at least two rows offset in the height direction) rather than a single plane. This spatial reconfiguration allows the finger axes to intersect outside the traverse while maintaining a compact traverse width, resolving the contradiction between improved gap widening and reduced traverse area.
Solution Approach 2:
The patent employs asymmetry by offsetting adjacent fingers in height across multiple rows, creating an asymmetric spatial arrangement. This asymmetric configuration enables the finger axes to converge outside the traverse boundary, achieving superior gap widening performance without proportionally increasing the traverse width.
2Device complexity
If fingers are arranged in a single plane, then the structure is simple, but the gap widening course is suboptimal leading to screen blockages
Solution Approach 1:
The patent transitions from a two-dimensional single-plane arrangement to a three-dimensional multi-row configuration with height offsets. This dimensional expansion creates optimized gap widening trajectories that prevent screen blockages, while the modular row structure keeps the overall device complexity manageable.
3Area of stationary object
If the traverse is made narrower, then the device footprint is reduced, but the gap widening course deteriorates
Solution Approach 1:
The patent uses height-staggered multi-row arrangements to achieve effective gap widening within a narrow traverse width. By utilizing the height dimension for finger offset, the design maintains compact traverse dimensions while ensuring optimal gap widening courses for efficient screening of difficult materials.
Solution Approach 2:
The asymmetric height offset arrangement among fingers in different rows enables the finger axes to intersect outside the narrow traverse, achieving superior gap widening performance without requiring a wide traverse, thus maintaining both compact size and high screening efficiency.
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
This design enhances the gap widening course and vibration capabilities, reducing the likelihood of screen blockages and improving the screening process for difficult materials, enabling effective separation of fine particles without requiring a motorized vibration drive.
Implementation Method 1
Because the fingers cantilever freely from the traverse, they are able to vibrate. In principle, the finger sieve according to the invention does not require a vibration drive. It can be operated as a passive sieve, the fingers of which are only deflected and vibrated when the material to be sieved is fed in.
Data Source
Figure 1~3
Figure 4~6
AI summary
The finger screen has at least one crossbeam (10) from which fingers (12, 14; 16, 18, 20) project in the direction of transport of the material being screened. These fingers are attached to the crossbeam (10) at their front base and have a free finger end at the rear. Adjacent fingers (12, 14; 16, 18, 20) are offset vertically on the front face (22) of the crossbeam (10). They spread out in the direction of transport of the material being screened, such that, projected transversely to the crossbeam (10), the apparent intersection point of the axes of adjacent fingers (12, 14; 16, 18, 20) lies outside the crossbeam (10) on the side of the crossbeam (10) facing away from the fingers (12, 14; 16, 18, 20).