Demolition Shear Tip Boot Wear Protection
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Solution Overview
Problem
Existing heavy-duty demolition shears face issues with wear and alignment of the shear tang, leading to reduced clamping force and premature breakage of shear tips, necessitating frequent maintenance and costly replacements.
Innovation Solution
A one-piece, three or four-sided hardened steel boot tip for the upper jaw tang, combined with shims for adjustable clamping, provides complete protection and alignment, ensuring maximum clamping force and extending the life of the shear tip by compensating for wear and manufacturing irregularities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a replaceable shear tip is welded onto the upper jaw tang, then the shear can cut through metal structures, but the shear tip becomes worn over time requiring periodic replacement
Solution Approach 1:
The shear tip is divided into multiple replaceable sections (first section, second section, third section) that can be independently replaced. When one section becomes worn, only that specific section needs to be replaced rather than the entire shear tip assembly, reducing maintenance time and costs.
Solution Approach 2:
The invention enables selective replacement of worn shear tip sections while retaining and reusing the unworn sections. The old unworn sections can be recovered and reused on new tip sections, maximizing material utilization and reducing waste.
2Device complexity
If the shear tip is not protected, then the structure remains simple, but the tang side faces become worn down requiring tightening of shear tip sections
Solution Approach 1:
The shear tip sections are designed with adjustable positioning mechanisms that allow dynamic adjustment of the clamping force as the tang wears. The sections can be tightened or repositioned to maintain optimal clamping force throughout the service life of the shear tip assembly.
Solution Approach 2:
The invention allows changing the clamping force parameter by adjusting the position of shear tip sections on the tang. As the tang wears, the sections can be repositioned to compensate for the wear and maintain the necessary clamping force for reliable operation.
3Force
If shear tip sections are tightened to compensate for wear, then clamping force is maintained, but the shorter lower L sections open up and rotate inward causing cutting edges to move laterally outward
Solution Approach 1:
The shear tip is segmented into multiple sections with independent positioning capabilities. This segmentation allows each section to be adjusted independently to maintain proper alignment of the cutting edges, preventing the lateral movement that occurs with monolithic designs under tightened clamping force.
Solution Approach 2:
The invention introduces intermediary adjustment mechanisms (such as positioning features or alignment elements) between the shear tip sections and the tang. These intermediaries facilitate precise alignment and prevent the sections from rotating inward when clamping force is applied, maintaining cutting edge accuracy.
4Ease of repair
If the shear is taken out of operation for part replacement, then maintenance can be performed, but downtime increases and costs increase
Solution Approach 1:
The segmented shear tip design allows maintenance personnel to access and replace only the specific worn section rather than the entire shear tip assembly. This reduces the time and complexity of maintenance operations, minimizing downtime and associated costs.
Solution Approach 2:
The invention enables extraction and replacement of individual shear tip sections independently from the rest of the shear mechanism. This selective replacement approach simplifies maintenance procedures and reduces the time the shear needs to be out of operation.
Data Source
AI summary
A one piece four-sided hardened steel boot tip for a distal end upper jaw tang of a heavy duty demolition shear having a upper movable shear jaw with a shear tip or tang. The tang has a front edge, side faces with apertures therethrough, a top seat, a rear seat and a bottom seat. The boot tip has a front wall seated on the tang front edge and a right side wall seated on the shear side tang face, rear seat and the top seat. A bottom wall of the boot tip is seated on the tang bottom seat and rear seat forming a shear punching edge between the front wall and the bottom wall. An access plate is seated on the guide side tang face, the top seat and the rear seat. The boot tip right side and access plate have matching apertures therethrough and alignable with the tang apertures to secure the boot and access plate to the tang. One or more shims may be used against the tang faces.