Pendular Striking Tool Bearing Section Design
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Solution Overview
Problem
Impact tools used for crushing metal or stone materials face issues with cracking and breakage due to excessive dynamic loads, despite heat treatment aimed at optimizing toughness and hardness for different mechanical properties in the bearing and striking sections.
Innovation Solution
The impact tool features a bearing opening with a support section and an extension section that lengthens the area surrounding the bearing opening, allowing for increased toughness and absorption of dynamic loads, reducing stress concentrations and the risk of cracking, while maintaining the tool's effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the bearing section is designed with high toughness to absorb dynamic loads, then the ability to withstand centrifugal forces and impacts is improved, but the area available for load absorption is limited, leading to stress concentrations and cracking
Solution Approach 1:
The bearing opening is extended in the longitudinal direction by adding an extension section, transforming the bearing section from a compact form to an elongated form. This dimensional extension increases the volume and surface area of the bearing section, providing more material to absorb dynamic loads and reducing stress concentrations without requiring changes to the material properties or cross-sectional dimensions.
2Strength
If heat treatment is applied to optimize hardness of the striking section, then wear resistance is improved, but the bearing section may become too brittle to absorb dynamic loads
Solution Approach 1:
The striking tool is divided into functionally distinct sections: a bearing section with higher toughness for absorbing dynamic loads and a striking section with higher hardness for impacting material. The extension section provides additional bearing section material that can be heat-treated to optimize toughness, while the striking section maintains its hardened properties. This segmentation allows independent optimization of each section's mechanical properties through selective heat treatment.
3Area of stationary object
If the bearing opening is made larger to reduce stress concentrations, then the area for load absorption is improved, but the structural integrity and compactness of the tool is reduced
Solution Approach 1:
Instead of increasing the cross-sectional dimensions of the bearing opening, the solution extends the bearing opening in the longitudinal direction. This maintains the tool's compact cross-section and structural integrity while increasing the overall volume and load-bearing capacity of the bearing section through extended length.
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 enhances the impact tool's ability to absorb dynamic loads over a larger area, reducing the risk of cracking and breakage, thereby extending the service life of the striking tools with minimal additional complexity.
Implementation Method 1
the bearing section should have good toughness and, as a result, good elongation properties in order to be able to absorb the high dynamic loads to which the impact tool is exposed during use
Implementation Method 2
the striking tools undergo a heat treatment after they have been shaped, during which the striking section is given the necessary hardness and the bearing section is given optimized toughness
Implementation Method 3
The centrifugal forces acting in the case of vertically or horizontally rotating percussion tools of the type explained above as a function of the respective rotational speeds are high and lead to strong dynamic loads in the region of the bearing section
Data Source
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AI summary
The invention relates to a striking tool (1) for the crushing of metal objects or rocky materials, wherein the striking tool (1) is produced from an iron-based material and comprises a bearing section (3) in which a bearing opening (4) is formed for the freely pendular mounting of the striking tool (1) about a pivot axis, as well as comprising a striking section (2) that is exposed to a striking impact during use via contact with the material to be crushed. The invention also relates to a rotor fitted with same for a machine for crushing metal objects or rocky materials. The striking tool (1) according to the invention easily improves the ability of its bearing section to receive the dynamic loads acting on the striking tool during use. In addition, the rotor according to the invention easily permits an optimal period of use of the striking tool pendularly mounted on same. This is achieved in that, in the new state of the striking tool (1), the bearing opening (4) has a support section (7) on the inner circumferential surface (8) of which the striking tool (1) is mounted in its pendular movement about the pivot axis, and an expansion section (9) which is connected to the support section (7) and via which the bearing opening (4) is expanded in the direction of the striking section (2) in relation of the support section (7).