A drill bit for a percussion drill

By designing the drill bit for the impact drilling rig and utilizing the staggered arrangement of the cutter head beam and cutting tools, as well as the filling block, the problem of cutting large soil thickness when drilling square pile holes was solved, resulting in easier cutting and a smoother inner surface of the pile hole.

CN224515128UActive Publication Date: 2026-07-17
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Filing Date
2025-07-23
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing technologies, when drilling square pile holes, especially during the conversion from round holes to square holes, require cutting through a large thickness of soil, making it difficult for the drilling tools to cut.

Method used

Design a drill bit for an impact drill, comprising a cutter head beam and cutting tools. The outer cutting tool conforms to the shape of the hole to be drilled, and the inner cutting tools are distributed within the outer ring and arranged in a staggered manner. The inner cutting tools and the outer cutting tools have roughly the same outline shape. The outer cutting tools are used to form the outer outline of the hole, and the inner cutting tools are used to cut the soil in layers. Filler blocks are placed between the wedge-shaped teeth for guidance and cutting.

Benefits of technology

By using a staggered arrangement of inner and outer cutting tools and a filler block design, the thickness of the soil being cut is reduced, making cutting easier, the hole-forming process smoother, and the inner surface of the pile hole smoother.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a drill bit of percussion drilling machine, set up on percussion drilling machine, is used for cutting the earth body when percussion drilling machine drills the hole, including the cutter holder for connecting with the vibrator of percussion drilling machine, and the cutter holder includes the blade holder beam, and the blade holder beam lower setting cutting tool. Have the circle surrounded by the blade holder beam, specifically the outer ring that coincides with the hole section profile shape of the to be drilled formation, wherein the outer ring blade holder beam and cutting tool constitute the outer ring cutting tool. Still be provided with a plurality of be surrounded in the outer ring cutting tool and independent of the inner cutting tool of outer ring cutting tool, and the inner cutting tool distributes at the place away from the outer ring center and close to the outer ring. The drill bit of percussion drilling machine of the utility model has a plurality of cutting tools, wherein the outer ring cutting tool is used for forming the outer contour of the final hole, and the plurality of inner cutting tools in the outer ring cutting tool are used for cutting the earth body in layers, reduce the thickness that the outer ring cutting tool needs to cut the earth body in it, make cutting easier.
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Claims

1. A drill bit for an impact drilling rig, mounted on the impact drilling rig for cutting soil during drilling by the impact drilling rig, comprising a tool holder for connection to a vibrator of the impact drilling rig. The tool holder includes a tool support beam, and a cutting tool is disposed under the tool support beam, characterized in that... It has a ring formed by a tool holder beam, specifically an outer ring that matches the profile of the hole to be drilled, wherein the outer ring tool holder beam and the cutting tool constitute the outer ring cutting tool; It also has several inner cutting tools that are surrounded by the outer ring cutting tool and are independent of the outer ring cutting tool; the inner cutting tools are distributed far from the center of the outer ring and close to the outer ring.

2. The drill bit of an impact drilling rig as described in claim 1, characterized in that, One of the following is an internal cutting tool: (1) Scattered distribution within the outer ring of the cutting tool; (2) Multiple inner cutting tools are grouped together, and multiple groups of inner cutting tools are distributed along the outer ring.

3. A bit for a percussion drill as claimed in claim 1, characterized in that The inner cutting tool is as follows: it consists of a blade holder beam that forms several inner rings within the outer cutting tool. The blade holder beam and the cutting tool together form the inner cutting tool. The inner and outer cutting edges have roughly the same outline shape; and the inner and outer cutting edges share the same center.

4. A bit for a hammer drill as claimed in claim 1, characterized in that The inner and outer cutting tools are arranged in a staggered manner, specifically, the inner cutting tool is positioned lower than the outer cutting tool on the horizontal plane.

5. A bit for a hammer drill as claimed in claim 1, characterized in that The tool holder also includes a reinforcing beam, and the tool holder beams are fixed to each other through the reinforcing beam; the reinforcing beam is connected to the impact drilling rig.

6. A bit for a hammer drill as claimed in claim 1, characterized in that The outer contour of the outer ring cutting tool is one of the following shapes: (1) Polygon, (2) Circle, (3) Shape composed of several arc segments, (4) Shape composed of several arc segments and straight line segments, (5) Rectangle; The outer diameter is smaller than the diameter of the cross-sectional profile of the hole to be drilled.

7. A bit for a hammer drill as claimed in claim 1, characterized in that The aforementioned tool holder beam is a vertical plate, and the cutting tool is located at the lower edge of the vertical plate.

8. A bit for a hammer drill as claimed in claim 7, characterized in that The cutting tool is a beveled edge on the lower edge of a vertical plate.

9. A bit for a hammer drill as claimed in claim 7, characterized in that The cutting tool consists of several wedge-shaped teeth distributed along the lower edge of the vertical plate, with the tips of the wedge-shaped teeth facing downwards.

10. A bit for a hammer drill as claimed in claim 9, characterized in that The surface of the vertical plate furthest from the center of the outer ring cutting tool is defined as the outer surface of the vertical plate. The root side of the wedge-shaped tooth protrudes from the outer surface of the vertical plate; A filler block is placed between the two wedge-shaped teeth, and the filler block is parallel to the vertical plate; the height at which the filler block protrudes from the outer surface of the vertical plate is the same as the height at which the root side of the wedge-shaped teeth protrudes from the outer surface of the vertical plate. The fill block is a polygon, with one corner of the polygon pointing downwards.