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Staged hard rock breaking hob drill bit

A graded, drill bit technology, applied in drill bits, drilling equipment, earth-moving drilling, etc., can solve the problems of low drilling efficiency and long construction period.

Pending Publication Date: 2021-07-06
CHINA COAL SPECIAL DRILLING ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the construction technology of drilling method has made great progress, but there are still shortcomings in the drilling construction of large-diameter hard rock formations such as low drilling efficiency and long construction period

Method used

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  • Staged hard rock breaking hob drill bit
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  • Staged hard rock breaking hob drill bit

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Embodiment 1

[0030] see Figure 1-7 : a graded rock-breaking hard rock hob drill bit, comprising a drill body, the working end of the drill body is provided with a secondary cutterhead 12 and a primary cutterhead 13 with a height difference from the inside to the outside, the primary cutterhead 13 The rear ends of the cutterhead 13 and the secondary cutterhead 12 are respectively connected to drilling tool systems of different frequencies to realize frequency division drilling, and the front ends of the first-stage cutterhead 13 and the second-stage cutterhead 12 are respectively used to connect the cutter holder and the hob 26. A slurry replenishing device is provided on the outer periphery of the working end of the drill body, and a slurry suction device is provided on the primary cutter head 13 .

[0031] The primary cutterhead of this embodiment is ahead of the secondary cutterhead, so that during the drilling process, large and small holes with a height difference of 115mm will be for...

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Abstract

The invention provides a staged hard rock breaking hob drill bit. The staged hard rock breaking hob drill bit comprises a drill bit body, wherein the working end of the drill bit body is provided with a second-stage cutter head and a first-stage cutter head which have height difference from inside to outside, the rear end of the first-stage cutter head and the rear end of the second-stage cutter head are connected with drilling tool systems with different frequencies correspondingly and used for achieving frequency division drilling, the front ends of the first-stage cutter head and the second-stage cutter head are used for being connected with a cutter holder and a hob correspondingly, a slurry supplementing device is arranged on the periphery of the working end of the drill bit body, and a slurry sucking device is arranged on the first-stage cutter head. According to the staged hard rock breaking hob drill bit, due to the fact that the first-stage cutter head is ahead of the second-stage cutter head, large and small holes with the height difference can be formed in the drilling process, and the small holes are arranged below the large holes, so that a free surface is added between the large and small holes, and rock breaking of the drill bit is facilitated; in addition, the staging design of the cutter heads plays a stabilizing role in the drilling process, the number of revolutions can be effectively increased, the rock breaking frequency of the hob is improved, and meanwhile, the absorption of drilling slag is facilitated.

Description

technical field [0001] The invention relates to the technical field of drilling construction, in particular to a graded rock-breaking hard rock hob drill bit. Background technique [0002] With the improvement of my country's comprehensive strength, the infrastructure market has developed rapidly, the diameter of large-scale bridge hard rock pile foundations has continued to expand, and the capabilities of drilling equipment have also continued to improve with the development of science and technology and the improvement of my country's machining capabilities. The core components, whose reasonable structural design can effectively improve drilling efficiency and reduce construction costs, play a very important role. [0003] At present, the construction technology of drilling method has made great progress, but there are still disadvantages of low drilling efficiency and long construction period in the drilling construction of large-diameter hard rock formations. Contents o...

Claims

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Application Information

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IPC IPC(8): E21B10/42E21B10/60E21B10/62E21B10/54
CPCE21B10/42E21B10/54E21B10/602E21B10/62
Inventor 杨光冯金亮李新利刘峰刘伟军王宗金晏中俊李奕魏奎赵明河田月祥郭厚才周立亮
Owner CHINA COAL SPECIAL DRILLING ENG
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