Drill bit used for high air-pressure down-the-hole drill hammer with capability of penetrating reinforced concrete

Abstract

Provided is a drill bit used for a high air-pressure down-the-hole drill hammer with the capability of penetrating reinforced concrete. The drill bit comprises a drill bit body, air exhaust holes and slag removing holes. The key point of the structure is characterized in that elongated tooth heads are inlaid on a panel of a head of the drill bit body. The drill bit used for the high air-pressure down-the-hole drill hammer with the capability of penetrating reinforced concrete has following advantages: by changing the distribution of the tooth heads of the drill bit body, the point distribution structure of the tooth heads is changed to be elongated distribution structure for alloy tooth heads; tooth roots are used to be small-diameter blind holes and are changed to be elongated tooth grooves; elongated alloy tooth heads are embedded into the drill bit body so that heat treatment technology becomes easy; welding-on reliability is greatly improved; due to the elongated structure of the alloy tooth heads of the drill bit body, the contact area for acting force is increased; force is applied by lines instead of points; and under effect of high frequency impact, panels of the alloy tooth heads of the drill bit body can operate in the knife-cutting mode in order to generate plastic deformation by force. The drill bit used for the high air-pressure down-the-hole drill hammer with the capability of penetrating reinforced concrete has following beneficial effects: the speed for penetrating reinforced steel bar is 20 times as high as original speed; and the drill bit has 10 or 20-fold service lifetime as compared with an ordinary drill bit.

Description

technical field [0001] The invention belongs to a drill bit for various drilling down-the-hole drilling impactors, in particular to a drill bit for a high-wind-pressure down-the-hole drilling impactor for penetrating reinforced concrete. Background technique [0002] In the drilling construction of reinforced concrete, the down-the-hole drilling rig sometimes encounters steel bars after drilling a certain footage, and also encounters steel bars after moving the hole position. At this time, whether the drill bit can successfully penetrate the steel bars is directly related to the success or failure of the hole drilling. Drilling construction cost and construction period have a great impact. Existing high wind pressure down-the-hole drilling impactor drill bit structure such as figure 1 As shown, the combination of drill body 1, spherical column alloy tooth head 5, head vent hole 3, and slag discharge groove 4 constitutes a whole. This structural form is called spherical colu...

AI Technical Summary

Problems solved by technology

Existing high wind pressure down-the-hole drilling impactor drill bit structure such as figure 1 As shown, the combination of drill body 1, spherical column alloy tooth head 5, head vent hole 3, and slag discharge groove 4 constitutes a whole. This structural form is called spherical column alloy tooth head, and ordinary spherical column The alloy tooth head is embedded with 10 to 12 hemispherical column tooth heads in the head of the drill body. When drilling into the middle hole and encountering steel bars, the steel bars are hard ground and crushed by repeated high-frequency stamping and rotary force of the impactor, resulting in Drilling takes a long time, and the spherical column tooth head is easy to break, causing the drill bit to be scrapped. When it encounters the position of multi-layer vertical and horizontal cross steel bars, the punching force causes the steel bar to form multiple thorns at the fracture, and the drill bit is often stuck. Increased construction costs and reduced drilling efficiency

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