Curved Impact Surface for Breaking Hammer Tool Wear
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Solution Overview
Problem
The existing breaking hammers experience wear in bearing bushings, leading to an angle error between the percussion piston and tool, causing damage to impact surfaces and reducing the service life of the hammer.
Innovation Solution
The tool features a curved impact surface in the shape of a cylinder segment, which provides a larger contact area and absorbs stress, allowing for a larger angle error between the piston and tool, thus protecting the percussion piston and extending the hammer's service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bearing bushings are used to support the tool, then the tool can be securely mounted to the breaking hammer, but wear in the bearing bushings causes angle error between the percussion piston and tool, leading to damage of impact surfaces
Solution Approach 1:
The impact surface of the tool is designed with a curved form surface (cylinder segment) instead of a flat surface. This curvature allows the impact surface to accommodate angle errors caused by bearing wear, maintaining a larger contact area with the percussion piston and preventing edge contacts that would cause damage. The curved surface adapts to the misalignment while distributing stresses evenly.
Solution Approach 2:
The tool with its curved impact surface is designed to be a sacrificial component that can withstand angle errors and wear. The tool absorbs the damage from bearing wear through its curved geometry, protecting the more expensive percussion piston. The tool can be replaced more frequently than the percussion piston, effectively serving as a protective element.
2Strength
If a flat impact surface is used on the tool, then the manufacturing is simpler, but the contact area with the percussion piston is small, leading to high stresses and reduced strength
Solution Approach 1:
The impact surface is formed as a cylinder segment with a specific radius of curvature. This curved geometry inherently provides a larger contact area with the flat percussion piston surface, distributing the impact stresses over a broader area and improving the strength and durability of the impact surfaces without requiring complex manufacturing processes beyond standard curving capabilities.
3Reliability
If the impact surface is made with a spherical form, then it can accommodate angle errors, but the contact area is still limited due to point-form contact
Solution Approach 1:
Instead of a spherical form surface that curves in multiple directions, the invention uses a cylinder segment that curves in only one direction. This unidirectional curvature is optimized to match the typical plane of angle error caused by bearing wear, providing a larger linear contact area with the percussion piston while maintaining the ability to accommodate angle errors effectively.
Data Source
Figure 1~2
Figure 3
Figure 4~6
AI summary
The invention relates to a tool for a breaking hammer, a breaking hammer, and the use of a breaking hammer. The breaking hammer comprises a percussion device (5), the percussion piston (9) of which provides impacts to the tool (6) for breaking rock. An impact surface (13) of the tool comprises a curved form surface (23) that has a radius of curvature (R) and a centre axis (K) on the longitudinal axis (18) of the tool. The direction of the centre axis is transverse to the plane through the longitudinal axis (C) of the boom (3) of the work machine (2).