Chisel Holder with Angled Support Surfaces for Mining
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Solution Overview
Problem
Chisel holders in existing tool combinations are prone to loosening due to alternating stress during surface mining, leading to tool breakage and premature failure, especially in high-infeed applications, and are not adequately dimensioned for such operations.
Innovation Solution
A chisel holder design with a holding attachment featuring angled support surfaces that protrude in the tool feed direction, allowing for secure alignment and force distribution close to the chisel head, combined with a base part having a support extension and counter-bearing for double fixation, ensuring stable force transmission and assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the chisel holder is secured with a screw pressing against support surfaces, then the chisel holder can be fixed in the base part, but the alternating stress causes the fastening screw to loosen and the chisel holder becomes unsecured
Solution Approach 1:
The support structure is segmented into multiple support surfaces distributed at different locations and orientations. Instead of relying on a single fastening point, the load is distributed across multiple contact points between the chisel holder and base part, reducing the stress concentration on any single fastening element and preventing loosening due to alternating stress.
Solution Approach 2:
The support surfaces are arranged in three-dimensional space at different angles and positions relative to the tool feed direction. This spatial distribution creates a multi-dimensional support system that resists forces from various directions, transforming a single-axis fastening problem into a multi-axis stable connection.
2Adaptability or versatility
If the chisel holder is designed with traditional dimensions, then it can be used in standard applications, but it is not adequately dimensioned for mining operations requiring high tool depth
Solution Approach 1:
The dimensions and geometry of the chisel holder are specifically optimized for high-load mining applications. The support surfaces are positioned and sized to handle the increased forces and deeper tool engagements required in surface mining, transforming the holder from a generic component to a specialized high-strength tool designed for extreme conditions.
3Strength
If the chisel holder is supported over a large area behind the plug-in extension, then the load distribution improves, but the point of force transmission is moved away from the tool head, increasing acting torques
Solution Approach 1:
Support surfaces are positioned in three-dimensional space at strategic locations including areas in front of and behind the plug-in extension. This spatial arrangement allows the system to benefit from both large-area load distribution and close proximity to the tool head, as the multi-dimensional support configuration reduces acting torques while maintaining excellent force distribution.
4Ease of manufacture
If dovetail joints are used between the base and chisel holder, then assembly is simplified, but the mating surfaces wear out due to alternating stress, leading to premature failure
Solution Approach 1:
Instead of using a single dovetail joint configuration, multiple support surfaces with different orientations and positions are implemented. Each local contact area is optimized for its specific function, and the distribution of loads across these multiple locations prevents any single mating surface from wearing out prematurely, thereby extending the overall service life while maintaining assembly simplicity.
Data Source
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Figure 3
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AI summary
The invention relates to a chisel holder with a plug-in extension (21) and a retaining extension (25), wherein the retaining extension has a chisel receptacle (26), and wherein the retaining extension (25) projects at least partially from or beyond the plug-in extension (21) in the tool feed direction (V). Such a chisel holder is designed for optimized tool life by the fact that the retaining extension (25) has a support section with a rigid, integrally formed support surface (29) which is arranged at least partially in front of the plug-in extension (21) in the feed direction. The invention further relates to a base part (10) for receiving a chisel holder as described above.