Compostable Material Shredder With Reversible Cutting Inserts
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing shredding devices for compostable materials face issues such as prolonged downtimes due to the need for tool removal and re-sharpening, especially in mobile applications, and inefficiencies when processing waste with high green content, including material jams.
Innovation Solution
The design features primary and secondary cutting tools arranged on the working cylinder, with secondary tools pivotable to disengage and re-engage, and cutting edges that can be reversed for continued use, allowing for efficient shredding and minimizing downtime through easy blade exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cutting tools are rigidly attached to the working cylinder, then they are constantly in engagement with the material, but they are subject to wear and tear and require removal for resharpening, causing downtime
Solution Approach 1:
The cutting tool is divided into a body portion and a separate cutting edge portion (insert). The insert can be detached, replaced, or reversed independently from the tool body, allowing quick changes without removing the entire tool from the working cylinder. This segmentation enables continuous operation by allowing rapid insert replacement when cutting edges become worn.
Solution Approach 2:
The cutting insert is designed to be disposable or reversible. When one cutting edge becomes worn, the insert can be quickly replaced with a fresh one or flipped to use the opposite cutting edge. This approach recovers the tool body for continued use while discarding or temporarily setting aside the worn insert, minimizing downtime.
2Productivity
If cutting edges are arranged to always point in the direction of rotation, then they are constantly in engagement with the material, but the tool must be removed to resharpen them
Solution Approach 1:
The cutting tool is segmented into a reusable body and a replaceable insert with cutting edges. This allows the cutting edges to be maintained (by replacement or reversal) without removing the entire tool assembly from the working cylinder, significantly easing maintenance while preserving continuous shredding efficiency.
Solution Approach 2:
The cutting insert is designed with cutting edges on opposite sides. When one set of cutting edges becomes worn, the insert is flipped around to present the opposite cutting edges, which are still sharp. This inversion allows continued use of the same insert body, simplifying maintenance to a simple flip operation rather than complete tool removal and resharpening.
3Loss of time
If cutting plates are detached and fastened again after turning over, then cutting edges can be reused, but the process is very time-consuming
Solution Approach 1:
The cutting insert is segmented from the tool body and designed with a quick-release mechanism. This allows the insert to be detached and reattached rapidly without complex fastening operations, reducing the time required for blade replacement while maintaining ease of operation through simple, tool-free or minimal-tool changes.
Solution Approach 2:
Instead of detaching and reattaching the entire cutting plate, the insert is simply flipped around in place. This inversion operation is much quicker than complete removal and reattachment, significantly reducing downtime while keeping the operation simple and easy to perform.
4Productivity
If secondary cutting tools are stationary relative to primary cutting tools, then material is shredded between them, but they cannot disengage to avoid material jams
Solution Approach 1:
The secondary cutting tool carrier is made dynamic rather than stationary. It can pivot or move relative to the primary cutting tools on the working cylinder. This dynamic capability allows the secondary tools to disengage from the material flow when jams are detected, preventing further jams and allowing quick clearing, while maintaining stationary engagement during normal efficient shredding operations.
Data Source
Figure 1
Figure 2a~2b
Figure 2c
AI summary
The device has primary cutting tools (6) arranged on a casing surface of a working cylinder (5) that rotates in a preset direction. Secondary cutting tools (8.1-8.3) are arranged in a secondary cutting tool carrier (7), where material is crushed between the primary and secondary tools. The carrier concentrically encloses the cylinder and extends tills to a discharge area (A) for the material. The secondary tools are arranged in an inlet area (E) and the discharge area, where form of the secondary tools and/or positions of the secondary tools on the carrier are different in the areas.