A guide rod loose leaf card is taken from the locking pick core drill barrel

Abstract

The invention provides a guide rod detachable blade clamping self-locking type tooth-cutting core drill barrel which comprises a barrel body (1), a soil retaining plate (3), a first return spring (4),a plurality of detachable blade assemblies (5), a self-locking mechanism (6) and an unlocking device (7). When the barrel body is filled with rock blocks to enable the soil retaining plate to overcome pressure of the first return spring to move upwards relative to the barrel body, the tail end of rotary detachable blades at the inner bottom of the barrel body can be gradually opened, and the position of the soil retaining plate can be locked by the self-locking mechanism, so that the rock blocks in the barrel body can be kept blocked when the drill barrel is lifted out of a drill hole, and the rock blocks are prevented from falling out of the barrel body. By pressing an unlocking rod of the unlocking device, the locking of the position of the soil retaining plate and the angle of the rotary detachable blades can be released, and rock unloading is completed. The device is simple in structure, convenient to operate and high in efficiency. The rotary detachable blades have no influence on the rotary drilling work of the barrel body, the drilling resistance of the drill barrel is small, and the drilling work efficiency can be further improved.

Description

Technical field [0001] The invention relates to a rotary drilling tool of a rotary drilling rig, in particular to a self-locking pick core drill barrel with a guide rod movable leaf clamp. Background technique [0002] Pick core drill barrel is a kind of rotary drilling tool that is used more. It is mainly used to drill hard rock mass or mixed soil with hard rock mass. Pick core drill barrel is mainly used for In the process of rotary digging, the rock mass is cut and the cut rock block is extracted out of the borehole. The existing pick core drill barrel is a single-wall micro-cone barrel structure, and the bottom is arranged with picks for cutting the rock mass. There is a water outlet, which is connected with the drill pipe of the rotary drilling rig through a square tenon bolt structure, and accepts the pressure and torque transmitted by the drill pipe. When the pick core drill barrel is working, the drill rod transmits pressure and torque to the drill barrel. The pick at th...

AI Technical Summary

Problems solved by technology

[0003] The existing pick core drilling barrel has a single-wall barrel structure, and the picks at the bottom can efficiently cut the rock mass, but cannot completely extract the rock mass stored in the drill barrel out of the borehole, mainly because the cutting The coring drill barrel does not have a rock block pick-up device, which causes the compacted broken rock blocks to fall when the drill barrel is filled and lifted upwards, which seriously affects the coring efficiency

In addition, when the drilling rig is used to shake the drill barrel during the process of unloading the rock blocks outside the hole, the broken rock in the drill barrel is easy to hit the inner wall of the drill barrel, causing relatively long-term noise and affecting the construction environment

[0004] Existing rotary drilling rigs are generally only equipped with a soil retaining mechanism at the bottom of an ordinary drilling bucket dedicated to soft clay layers. For example, Chinese patent 201910653190.X discloses a rotary drilling rig, which is provided at the bottom opening of the drilling bucket The drill door can be turned and opened, and the turning device is also connected to the drive cylinder. The structure is complex and the operation steps are many, which is not conducive to improving construction efficiency.

In addition, Chinese patent 201220354155.1 discloses a flap drill with a soil retaining mechanism. In this solution, the bucket teeth are replaced with picks for drilling hard rock mass, and a soil retaining device is added at the opening at the bottom of the drill bit. Although the baffle mechanism can retain soil, it will increase the resistance during the drilling process, and because the baffle has a two-way blocking effect, it is difficult for large pieces of hard rock to enter the drilling bucket

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