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|Name:||Double Tube Core Drilling Tool||Application:||Mining Exploration|
drilling rig parts,
drilling rig components
In the drilling process, the double pipe drilling tool in which the outer pipe rotates and the inner pipe does not rotate is called a single acting double pipe drilling tool. Since the single-acting double-tube drilling tool avoids the mechanical vibration of the rock core by the friction vibration generated by the rotation of the drill, the core quality is high.
The upper joint has a movable environmental protection path, and the groove is arranged on the joint to ensure the diameter of the alloy piece. The distance between the spring seat and the step inside the drill bit is adjusted by the screw and the lock nut; and the length difference between the inner and outer tubes itself is also controlled. The single-action form has a spherical structure, a single-bearing structure and a double-bearing structure (Fig. 2, Fig. 3, Fig. 4). Its working principle: the drilling machine is used to transmit power to make the drilling tool rotate, and the outer tube is connected to the cutting edge of the drill bit or the grinding material is ground. The rock breaks it, and the inner tube (ie, the core tube) remains stationary during the drilling process, so that the removed core avoids disturbance and can remain substantially in its original state.
Single-action double-tube drilling tools types and characteristics
1. Water-proof single-action double-tube drilling tools
The drilling tool consists of five parts: outer pipe joint, single action device, inner and outer pipe, card center device and special drilling tool.
In addition to single action, the drill has a good guiding, water-proof and card center device. The outer tube can be connected to a special carbide drill or steel drill bit for drilling into different salt mine layers.
2. Piston type single acting double pipe drilling tools
This type of drilling tool is a special core drilling tool for the exploration of talc mines. It is mainly composed of five parts: water distribution joint, single action bearing, special semi-synthetic pipe, rubber piston and step drill bit.
When using, punch, do not put the steel ball into the hole, and the flushing liquid directly enters the half pipe to push the piston to the step at the bottom of the bit. At this time, the rinsing liquid flows into the annular gap of the inner and outer tubes from the two return holes at the lower end of the single-action shaft, and enters the bottom of the hole through the water outlet hole on the step drill bit, carrying the rock powder returning to the orifice. After punching and sweeping, put in the steel ball. When drilling, the rinsing liquid enters the bottom of the hole from the gap between the two outlet pore inner tubes on the water joint and the water outlet hole on the step drill bit.
3. Pressure card type single acting double tube
This type of drilling tool consists of main components such as rotary, single action, card core, return water and drill bit. The drill is suitable for relatively intact, jointed or fibrous rock ore. Such as asbestos and so on.
The drill is of the piston type and the ball clamp type.
After the two types of drilling tools are drilled into the borehole, do not put the steel ball into the hole. After the pump is flushed, the hole is drilled normally. After the end of the mining process, when the rock core is mined, the steel ball is put into the tank and the pump is opened into the tank. The rinsing fluid is forced to force the core breaker to strongly capture the rock core.
4. Claw spring type single action double pipe drilling tools
The drilling tool is suitable for drilling in rock formations such as thin coal seams with soft and hard alternating, frequent and unstable, and less than 6 grades.
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