Hydraulic underreaming drill bit

Abstract

The invention discloses a hydraulic underreaming drill bit. The hydraulic underreaming drill bit comprises a main stand column used for being connected with a drill rod, an upper sliding structure, a lower sliding structure, a main extendable power piece, an auxiliary extendable power piece, a connecting rod structure and a soil scraping assembly, wherein one end of the main extendable power piece is connected with the upper sliding structure, the other end of the main extendable power piece is connected with the connecting rod structure, one end of the auxiliary extendable power piece is fixedly arranged on the main stand column, and the other end of the auxiliary extendable power piece is connected to the lower sliding structure; the main extendable power piece drives the soil scraping assembly to expand or contract in the radial direction of the main stand column when extending; and the auxiliary extendable power part drives the soil scraping assembly to move up and down when extending. The hydraulic underreaming drill bit is provided with the main extendable power piece and the auxiliary extendable power piece at the same time, multiple different working modes can be achieved by adjusting the extendable state of the main extendable power piece and the extendable state of the auxiliary extendable power piece, the working modes of the hydraulic underreaming drill bit are more diversified, and one hydraulic underreaming drill bit is used, and can perform various different reaming operations.

Description

technical field [0001] The invention relates to the technical field of hole reaming equipment, in particular to a hydraulic bottom reaming drill bit. Background technique [0002] The bottom expansion drill bit is a drill bit used for constructing bottom expansion piles in rotary drilling, and generally consists of bottom expansion wings, pressure frames, connecting rods, bases and pin shafts. The expansion wing has two wings, three wings or four wings. When the drilling rig rotates, the expansion wing is gradually opened under the action of the drilling tool's own weight, and the bottom expansion is carried out by cutting the hole wall. [0003] The bottom expansion drill bit in the prior art includes a small diameter drill bit and a large diameter drill bit. The small diameter drill bit is provided with two oil cylinders, and the bottom expansion wing forms a left and right enlarged structure by pushing the oil cylinder up and down. This structure is formed during use. Th...

AI Technical Summary

Problems solved by technology

[0003] The bottom expansion drill bit in the prior art includes a small diameter drill bit and a large diameter drill bit. The small diameter drill bit is provided with two oil cylinders, and the bottom expansion wing forms a left and right enlarged structure by pushing the oil cylinder up and down. This structure is formed during use. The component force is very small, which reduces the feed rate and increases the processing time. In the case of too much soil, there is a situation that it cannot shrink, which affects the bottom expansion efficiency.

Large-diameter drills need to use four oil cylinders to push the support arm to expand, and the structure is relatively heavy during use, so it can only be used for large-diameter bottom expansion operations

And the two kinds of bottom reaming drill bits in the prior art can only realize plane reaming, and the operation mode is single

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