Rock Drill Shank Reinforcement for Dust Removal and Shear Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing rock drilling tools face issues with wear and tear, particularly at the drill head and shank connection, leading to reduced stability, increased risk of shearing, and dust compaction, which can result in operator safety hazards during deep drilling.
Innovation Solution
The rock drilling tool features a diameter reinforcement in the conveying section, creating a stronger connection between the drill head and shank, enhancing torsional force transmission and dust removal, with a one-piece design and strategically placed cutting elements to manage wear and prevent dust compaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the diameter of the drill shank is increased at the conveying section, then the stability and adhesion between drill head and drill shank is improved, but the device complexity increases
Solution Approach 1:
The drill shank features a localized diameter increase (feed section with diameter D1) at the conveying section adjacent to the drill head, while the fastening section maintains a smaller diameter (D2). This local quality change strengthens the connection where wear occurs most without unnecessarily increasing the overall shank diameter, resolving the contradiction between stability and structural simplicity.
Solution Approach 2:
Instead of uniformly increasing the shank diameter along its entire length, the invention introduces a dimensional variation along the axial dimension of the shank. The feed section has a larger diameter D1 while the fastening section has diameter D2, creating a stepped or tapered structure that provides localized reinforcement exactly where needed for drill head adhesion.
2Productivity
If the diameter of the conveying section is increased, then the dust removal efficiency is improved, but the manufacturing complexity increases
Solution Approach 1:
The diameter increase is applied locally only to the conveying section where dust removal is critical, rather than increasing the entire shank diameter. This localized modification optimizes dust ejection through the conveying grooves while minimizing additional manufacturing complexity compared to a uniform diameter increase.
Solution Approach 2:
The drill shank is segmented into functional sections with different diameters: the feed section (diameter D1) for dust removal and the fastening section (diameter D2) for mounting. This segmentation allows each section to be optimized for its specific function while keeping the overall manufacturing process manageable through standardized sections.
3Force
If the contact surface between drill head and drill shank is maximized, then the torsional force transmission is improved, but the risk of shearing increases
Solution Approach 1:
The enlarged diameter at the feed section creates an expanded contact surface between the drill head and drill shank precisely at the drill head support area where wear and shear forces are greatest. This localized reinforcement strengthens the connection against shearing while maintaining optimal torsional force transmission through the increased contact area.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a drilling tool, in particular a rock drilling tool, for a portable machine tool, comprising a drill head, in particular a hard metal drill head, comprising a drill shaft connected, in particular integrally with the drill head, and comprising a rotational axis, wherein the drill shaft is designed as one piece, has a guide section with guide groove winding in a spiral-shaped about the drill shaft for transporting away drilling dust, and has a securing section which is provided for detachably securing the drilling tool to a machine tool. According to the invention, the guide section has a diameter reinforcement at a drill head support region of the guide section neighbouring, in particular adjacent to, the drill head.