Cutter Unit Blade Fixation via Single Locking Element
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Solution Overview
Problem
Existing rotary tilling machines face challenges in efficiently and cost-effectively fixing blades to the rotor, with complex assembly and high production costs due to the need for numerous screws and delicate components, leading to instability and practicality issues during maintenance.
Innovation Solution
A cutter unit design featuring a coupling flange with inserts and a counter-flange divided into sectors, allowing blades to be securely fixed using a reduced number of screws, with a single locking element, and minimizing complex components, enabling easy assembly and disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If blades are fixed to the rotor by means of a pair of screws, then the blade is prevented from rotating with respect to the rotor, but the fixing process becomes costly in terms of time and complexity
Solution Approach 1:
The patent merges the functions of multiple separate fixing elements into a single integrated locking element. This locking element simultaneously secures both blades to the rotor, eliminating the need for multiple separate screws or fasteners. The unified design reduces assembly complexity while maintaining reliable blade fixation, directly resolving the contradiction between fixation stability and assembly complexity.
Solution Approach 2:
The locking element is designed to perform multiple functions simultaneously: it secures both blades to the rotor, prevents blade rotation, and provides a stable fixation structure. This multi-functional design reduces the total number of components needed, thereby simplifying the assembly process while ensuring reliable blade attachment.
2Productivity
If a large number of blades are fixed to the rotor, then the cutting effectiveness is improved, but the assembly and maintenance time increases significantly
Solution Approach 1:
The patent combines multiple blade fixation operations into a single locking action. By using one locking element to secure multiple blades simultaneously, the assembly process for a large number of blades becomes much faster. During maintenance, replacing or adjusting blades requires only loosening and removing this single locking element, dramatically reducing the time lost to assembly and disassembly operations.
3Reliability
If complex fixing systems with multiple components are used, then blade retention is improved, but production costs increase due to the need for special components
Solution Approach 1:
The patent extracts the essential function of blade retention from a complex system of multiple special components and implements it through a single, simplified locking element. This extracted design maintains reliable blade retention while eliminating the need for numerous specialized parts, thereby reducing manufacturing complexity and production costs.
Solution Approach 2:
The locking element is designed as a simple, inexpensive component that can be easily manufactured and replaced if needed. Rather than using expensive, complex specialized components, this straightforward design achieves reliable blade retention at lower production cost, aligning with the principle of using simpler, more economical solutions.
4Shape
If symmetrical blades are used in pairs, then the aesthetic appearance is improved, but the positioning becomes unstable without a locking element
Solution Approach 1:
The patent combines the positioning and stabilization functions into the single locking element. While the blades maintain their symmetrical aesthetic appearance, the locking element simultaneously secures both blades in their correct positions, preventing movement or instability. This merged solution preserves the desirable symmetrical shape while eliminating the positioning instability that would otherwise require separate positioning mechanisms.
Data Source
Figure 1~1A
Figure 2~3
Figure 4A~4C
AI summary
A cutter unit for a rotating tilling machine comprises a coupling flange connected to a rotor, a first blade and a second blade that comprises a respective operating portion and a respective coupling portion. The cutter unit further comprises a housing seat for the blades. The coupling portion of the first blade comprises an opening suitable for housing a locking element for locking said first blade in a direction of extraction of the blades from the housing seat and the blades comprise a respective shaped portion.