Rotor Scraping Element Layout for Unhindered Feedstock Flow
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Solution Overview
Problem
Existing comminution devices face issues with feedstock wedging and interference, leading to manual labor, machine downtime, and complex housing designs due to the attachment of scraping elements to side walls, which restrict material flow and require reinforced structures.
Innovation Solution
Scraping elements are positioned downstream of the rotor in the direction of throughflow, mounted on a support beam attached to the machine base frame, with a trapezoidal plate-shaped design and wear-resistant tools, allowing for efficient feedstock removal and reduced maintenance, enabling automatic removal during reversing mode and simpler housing construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If scraping elements are attached to the side walls of the housing, then feedstock removal function is achieved, but the housing walls require complex ribbed wall constructions to handle the forces
Solution Approach 1:
The scraping elements are extracted from the housing wall attachment and repositioned to be mounted directly on the rotor. This separates the force generation function from the housing structure, eliminating the need for complex ribbed wall constructions while maintaining the feedstock removal capability.
Solution Approach 2:
The rotor serves as an intermediary mounting structure between the scraping elements and the drive shaft. By attaching scraping elements to the rotor instead of the housing, the forces are transmitted through the rotor which is already designed to handle rotational loads, avoiding the need to reinforce the housing walls.
2Reliability
If scraping elements are designed with large size to achieve obtuse angle connection, then lifting effect for feedstock removal is improved, but the device occupies more space and increases material usage
Solution Approach 1:
The mounting position of the scraping elements on the rotor is optimized to achieve the desired obtuse angle connection. By adjusting the angular position and radial distance of the scraping elements from the rotor center, the lifting effect is achieved without requiring excessively large element sizes.
Solution Approach 2:
The scraping elements are arranged in multiple radial positions around the rotor circumference. This distributes the feedstock removal function across multiple smaller elements rather than requiring one or two very large elements, reducing the volume of individual scraping components.
3Reliability
If side attachment of scraping elements is used, then feedstock can be removed radially, but a barrier is produced that prevents free material flow to the side between rotor and housing
Solution Approach 1:
The scraping elements are extracted from the housing wall mounting position and relocated to the rotor. This repositioning removes the physical barrier that blocked material flow, allowing feedstock to move freely to the sides between the rotor and housing while the scraping elements continue to perform radial removal functions from their new position on the rotor.
4Reliability
If manual removal of wedged feedstock is performed, then interfering portions are removed from rotor, but labor costs and machine downtime increase
Solution Approach 1:
The scraping elements mounted on the rotor perform automatic removal of wedged and interfering feedstock portions during normal operation. The rotating scraping elements continuously scrape the rotor surface, eliminating the need for manual intervention and preventing machine downtime associated with manual feedstock removal.
Solution Approach 2:
The scraping elements operate continuously during rotor rotation, providing ongoing feedstock removal functionality. This continuous action prevents the accumulation of interfering material that would otherwise require periodic manual intervention, maintaining uninterrupted operation and reducing downtime.
Data Source
AI summary
A device for comminuting scrappable feedstock by way of cutting or shear-cutting is provided that includes at least one rotor situated within a housing. The rotor has a plurality of rotary disks which are situated at an axial distance from each other, forming spaces, and which are fitted on their circumferences with comminuting tools which interact with additional comminuting tools to perform the comminution work. Stationary scraping elements extend into the spaces in the radial direction. To achieve a largely unhindered flow of stock through the device, it is proposed according to the invention to situate the stationary scraping elements in the dead zone of the at least one rotor with regard to the direction of stock flow.