Percussion Rock Drill Front Head Rust-Resistant Sheath
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Solution Overview
Problem
Percussion rock drilling machines using case-hardened steel for the front head face rust issues when exposed to flushing media like water, compromising mechanical integrity and increasing maintenance costs, while stainless steel alternatives are more expensive and prone to mechanical failure under impact forces.
Innovation Solution
A rust-resistant sheath made from materials like plastic is integrated around the flush housing to protect it from the flushing medium, allowing the front head to be manufactured from cost-effective case-hardened steel, with seals ensuring minimal contact and distributing impact forces effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the front head is manufactured from case-hardened steel, then mechanical strength and ease of manufacture are improved, but resistance to flushing medium (rust resistance) deteriorates
Solution Approach 1:
The front head is divided into two distinct parts: the main body made from case-hardened steel for mechanical strength, and a separate sheath made from rust-resistant material (such as stainless steel or plastic) that surrounds the flushing medium passage. This segmentation allows each part to be optimized for its specific function without compromise.
Solution Approach 2:
The front head becomes a composite structure combining case-hardened steel (for strength) and rust-resistant material (for corrosion protection). The sheath acts as a protective layer that prevents direct contact between the flushing medium and the case-hardened steel, creating a material composite that exhibits both mechanical strength and rust resistance.
2Reliability
If stainless steel is used for the front head, then rust resistance is improved, but mechanical strength under impact forces deteriorates
Solution Approach 1:
The front head is divided into two distinct parts: the main body made from case-hardened steel for mechanical strength, and a separate sheath made from rust-resistant material (such as stainless steel or plastic) that surrounds the flushing medium passage. This segmentation allows each part to be optimized for its specific function without compromise.
Solution Approach 2:
Rust-resistant material is applied locally only where needed - specifically in the sheath that contacts the flushing medium - rather than throughout the entire front head. This allows the bulk of the structure to remain made from mechanically stronger case-hardened steel while providing rust protection exactly where required.
3Reliability
If rust-resistant material is used extensively, then resistance to flushing medium is improved, but manufacturing difficulty and cost increase
Solution Approach 1:
Rust-resistant material is applied locally only where needed - specifically in the sheath that contacts the flushing medium - rather than throughout the entire front head. This allows the bulk of the structure to remain made from mechanically stronger case-hardened steel while providing rust protection exactly where required.
Solution Approach 2:
The front head is divided into two distinct parts: the main body made from case-hardened steel for mechanical strength, and a separate sheath made from rust-resistant material (such as stainless steel or plastic) that surrounds the flushing medium passage. This segmentation allows each part to be optimized for its specific function without compromise.
Data Source
AI summary
The present invention relates to a percussion rock drilling machine comprising a front head (1), in which front head (1) are arranged a flush housing (26) and a flush connector (25) for flushing medium. According to the invention, a sheath (31) of rust-resistant material is arranged at the front head (1) around the flush housing (26), such that flushing medium can enter the flush housing (26) through the flush connector (25), without coming into contact with the front head (1).