Counter-Rotating Roller Screening Device for Clayey Grounds
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Solution Overview
Problem
Standard ground crushing and screening devices are inefficient with damp and clayey grounds, leading to reduced productivity and inadequate fine fragmentation, as they either obstruct or fail to effectively process materials with high plasticity indices.
Innovation Solution
A crushing and screening device featuring blades with inclined fragmentation profiles and counter-blades that cooperate to achieve fine fragmentation of damp and clayey grounds, allowing stones smaller than 20-25 mm to pass through while larger stones are retained and fragmented, utilizing a combination of rotating rollers and oblong contrasting members for effective screening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If standard screening means with co-rotating parallel rollers and hammer-type fragmentation elements are used, then screening function is provided, but damp and clayey grounds with high plasticity index obstruct the screening means, causing drastic reduction in productivity
Solution Approach 1:
The patent inverts the conventional screening approach by using counter-rotating rollers instead of co-rotating rollers. The counter-rotation creates a shearing action that prevents damp and clayey grounds from obstructing the screening means, thereby maintaining productivity while effectively processing high plasticity index materials
Solution Approach 2:
The patent changes the rotation direction parameter of the rollers from co-rotating to counter-rotating. This parameter change fundamentally alters the interaction between the screening means and damp clayey grounds, preventing obstruction and maintaining processing efficiency
2Manufacturing precision
If fragmentation rollers with only hammer-type fragmentation elements are used, then good fragmentation of very plastic grounds is obtained, but the fragmentation is not fine with nominal dimension of more than about 70-100 mm
Solution Approach 1:
The patent merges screening discs with blade-type fragmentation elements on the same rollers. This combination allows the system to achieve both fine fragmentation (below 20-30 mm) and effective screening in a single integrated device, eliminating the need for separate fragmentation and screening operations
Solution Approach 2:
The rollers in the patent serve multiple functions simultaneously: they provide screening through the discs and fragmentation through the integrated blade elements. This multi-functionality enables fine fragmentation of damp and clayey grounds while maintaining processing productivity
3Manufacturing precision
If star-type blades are used on screening rollers, then fine screening capacity is achieved for dry grounds or sandy matrix, but fragmentation capacity with damp or clayey grounds is poor
Solution Approach 1:
The patent applies different functional elements at different locations on the rollers: screening discs are positioned to handle the screening function while blade-type fragmentation elements are integrated to provide localized fragmentation action. This spatial differentiation of functions allows effective processing of damp and clayey grounds
Data Source
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AI summary
Ground crushing and screening device for a bucket (12), of a fixed screen or other, comprising a blade (10) having first constraint end (42) to be keyed to a rotating roller (28), a second end (44) opposite the first end (42), and an intermediate connection body (46) between the first end (42) and the second end (44), which has a development in a substantially linear direction (L), in use directed radially with respect to the roller (28) on which the blade is keyed. The second end (44) of the blade has a fragmentation profile inclined backward with respect to a direction of rotation (F) of the roller (28) having at least a segment (48) inclined by a desired first acute angle (α1) with respect to the direction (L) of development of the intermediate body (46).