Blade Replacement Mechanism Using T-Shaped Rivets
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Solution Overview
Problem
The existing machines for shredding cereals and fibrous materials face difficulties in replacing blades and contrast blades, which are numerous and difficult to access, requiring the use of dangerous equipment like angle grinders, making the process long, hazardous, and inaccessible to untrained operators.
Innovation Solution
A blade or contrast blade design featuring a sliding and locking mechanism using T-shaped rivets and an elastically deformable wing, allowing for quick and safe replacement without specialized tools, enabling easy access and operation by untrained personnel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If blades and contrast blades are fixed using welded or detachable methods with screws and bolts, then the blades can be replaced, but the replacement process becomes long, difficult, and dangerous requiring angle grinders and specialized equipment
Solution Approach 1:
The blade assembly is segmented into modular components: the blade body, the T-shaped rivet with detachable head, and the support structure with receiving slots. This segmentation allows the blade to be quickly detached and replaced without affecting the entire machine structure, eliminating the need for complex removal tools.
Solution Approach 2:
The detachable head portion of the T-shaped rivet is extracted as a separate removable component. This extracted element serves as a quick-release mechanism that can be easily removed by hand or simple tools, allowing the blade to be taken out without requiring angle grinders or specialized equipment.
2Productivity
If multiple blades and contrast blades are arranged in the hopper, then effective shredding is achieved, but the number of blades increases making replacement more time-consuming and hazardous
Solution Approach 1:
Each blade is designed as an independent modular unit with its own detachable T-shaped rivet. This segmentation allows individual blades to be replaced one at a time without disturbing adjacent blades, significantly reducing the total replacement time even when multiple blades need to be changed.
Solution Approach 2:
The detachable head of the T-shaped rivet is designed to be easily accessible and removable before the blade becomes deeply embedded in the hopper material. This preliminary access design allows operators to begin the replacement process immediately without extensive disassembly or dangerous positioning.
3Reliability
If blades are fixed in difficult-to-access positions in the hopper, then proper shredding function is achieved, but operator safety is compromised and replacement becomes hazardous
Solution Approach 1:
The head of the T-shaped rivet is extracted as a separate accessible component that can be removed from the outside or through accessible openings in the hopper. This allows the blade to be detached without operators needing to reach into dangerous, confined spaces within the hopper, eliminating exposure to rotating parts and stored energy.
Solution Approach 2:
The T-shaped rivet acts as an intermediary element between the blade and the support structure. Its detachable head provides a safe interface for tool engagement, allowing force to be applied externally to remove the blade without direct hand contact with hazardous areas inside the hopper.
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
Enables quick, safe, and easy replacement of blades with minimal operations, reducing manufacturing and maintenance costs, and ensuring operator safety without the need for dangerous equipment.
Implementation Method 1
a second seat (27) formed on the second perimetric edge (25) of the plate (16)... provided axially with at least one wing (28) that can be deformed elastically
Data Source
Figure 1
Figure 2
Figure 3~8
AI summary
A blade or contrast blade (1) which can be used particularly for example in machines for shredding cereals and/or fibrous material, composed of a plate (16) which has a first sharp perimetric edge (17) and, on the opposite side, a second perimetric edge (25), which are mutually connected by a third front edge (18). The third front edge (18) is slidingly and rotatably associable at an adapted first rivet (23) which protrudes from a support (24). The second perimetric edge (25) instead can be locked temporarily, upon a rotation imparted to the plate (16), at an adapted second rivet (30) which protrudes from the support (24).