Tapered Elliptical Blade Connection for Blast Cleaning Wheel
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Solution Overview
Problem
Existing centrifugal throwing wheels face issues with blade wear, 'shot-locking', and difficult blade removal due to parallel surfaces and tolerances, leading to safety concerns and inefficiencies in operation.
Innovation Solution
The implementation of a tapered elliptical design for both blade and wheel channels, providing a continuous non-parallel contact and positive locating position, allowing for easier blade removal and improved wheel balance at high speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a simple dove tail design with parallel surfaces is used to attach blades to the wheel plate, then the structure is simple and easy to manufacture, but the parallel surfaces cause abrasive particles to work into the connection, leading to shot-locking and difficult blade removal
Solution Approach 1:
The patent applies asymmetry by transitioning from parallel surfaces to tapered non-parallel surfaces in the blade connecting member and wheel plate channel. The tapered configuration creates asymmetric contact surfaces that prevent abrasive particles from working into the connection, eliminating shot-locking while maintaining ease of manufacture.
Solution Approach 2:
The patent inverts the traditional approach by making the blade connecting member removable from the wheel plate channel without requiring external tools or complex locking mechanisms. The tapered design allows the blade to be pulled out easily by reversing the insertion motion, eliminating the need for hammering or specialized removal tools.
2Ease of operation
If significant downward striking force is applied to remove blades from prior art designs, then the blade can be removed from the wheel, but the brittle blade material can crack or chip causing safety issues
Solution Approach 1:
The patent inverts the force application approach by designing the tapered connection to allow easy extraction through simple pulling motion rather than requiring downward striking force. This eliminates the harmful effect of blade cracking and splintering that occurs when hammers are used on brittle cast iron blades.
Solution Approach 2:
The patent converts the potential harm of tight fits and shot-locking into a benefit by using the tapered design to create a connection that is secure during operation but easily removable without damage. The taper allows the blade to be extracted cleanly without cracking, turning what would be a problematic tight fit into a controlled, damage-free removal process.
3Reliability
If stop members are inserted through the wheel to prevent blade movement and position blades for balancing, then the blades are secured and positioned accurately, but the stop members are subject to failure and damage more quickly than the surrounding structure
Solution Approach 1:
The patent extracts the stop member function from the design by eliminating the need for separate stopping components. The tapered non-parallel surfaces inherently prevent radial movement and provide positive positioning without requiring additional stop members that would be subject to failure and damage.
Solution Approach 2:
The patent merges the functions of blade securing, positioning, and balancing into the tapered connecting member and channel interface itself. This eliminates the need for separate stop members and integrates all blade retention functions into the primary connection structure, improving overall reliability and service life.
4Ease of operation
If the channel slot is larger than the blade connecting member due to tolerances and wear, then the blade can be installed and removed, but the sloppy fit allows particulate to work into the connection causing shot-locking
Solution Approach 1:
The patent applies asymmetry through the tapered non-parallel surfaces that prevent abrasive particles from working into the connection. The asymmetric taper creates a self-cleaning effect where particles are prevented from embedding in the fit between the blade connecting member and channel, maintaining connection integrity while allowing installation and removal.
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
This design eliminates 'shot-locking' and facilitates easier blade removal without significant force, ensuring safer operation and balanced wheel performance.
Implementation Method 1
the bladed wheel is rotated at high speed about a central axis and abrasive particulate material is fed onto the inner portions of the blade whereby the material is displaced by centrifugal force outwardly over the surface of the blades and projected at high velocity from the ends of the blades
Data Source
AI summary
A method and apparatus for connecting a blade to a single sided wheel plate or a pair of interconnected wheel plates. The assembly provides a repeatable, positive and even positioning location for each blade. It utilizes an ellipse that tapers outwardly from the center of the wheel along the blade connecting member that corresponds with the connecting channel on the wheel. The ellipse provides for equal and uniform contact on the entire blade connection to firmly hold the blade in place without parallel surfaces. The ellipse design provides a measured and increasing improved release in that all surfaces of the ellipse are tapered with non-parallel surfaces such that blade retention and blade removal is dramatically simplified.