Rotary shearing and impact linkage single pneumatic anchor bolt drill

Abstract

The invention relates to a rotary shearing and impact linkage single pneumatic anchor bolt drill. The drill is composed of a pneumatic gear motor, an underdriving gear set, a main shaft, a buffer spring, a piston, an annular distributing valve, a muffler, a box body, an end cover and the like and is characterized in that a pneumatic impact device, a pneumatic motor gear and a secondary cylindricalgear reducer are arranged in a U shape in the same box body, which can reduce the size and weight of the box body; the rear section of the main shaft is processed to be a spline shaft conducting reciprocating movement in a spline housing, and the spline housing is installed in a reducer gear IV to transmit running torque to the main shaft; the front section of the main shaft is fixed through thebuffer spring and has the dumping function of a drill body, the piston impacts the main shaft, and the main shaft drives a drill pipe and a drill bit to impact and break a rock; the impact device is turned off when drilling is normally conducted, and the rock is broken only by using rotary shearing; when a hard rock is to be drilled, the impact device is turned on, rotary shearing and impact act jointly, and the hard rock can be drilled fast.

Description

Technical field [0001] The invention relates to a bolt drill suitable for rapid drilling of a hard roof of an underground roadway, in particular to a rotary cutting and impact linkage type single pneumatic bolt drill. Background technique [0002] At present, the most commonly used bolt drilling rig for underground coal mines is the single pneumatic bolting rig. MQT is one of the more mature series, which is more suitable for bolt support operations in coal roadways. It can drill roof bolt holes and bolts. The cable hole can also be used to stir and install resin-coiled anchor rods or anchor cables. No other equipment is needed to install and tighten the anchor rod nuts at one time to meet the requirements of the initial anchor pre-tightening force. MQT pneumatic bolting rig has small size, light weight, simple operation and convenient maintenance. MQT type pneumatic bolting rig adopts geared pneumatic motor, stable operation, high reliability and strong anti-pollution ability, ...

AI Technical Summary

Problems solved by technology

The MQT pneumatic rock bolt rig adopts a geared air motor, which has stable operation, high reliability and strong anti-pollution ability, but it is only suitable for roadways with rock hardness ≤ f8. If the drilling encounters hard rock, the drilling speed will be very slow. , affect the speed of roadway excavation, make the coal mining out of balance, and seriously affect the output and economic benefits of the coal mine

[0003] The technology related to this application is Chinese Patent Authorization Announcement No. CN202946010U, a dual-purpose rock bolter with impact and rotation. Its impact device and rotary cutting device are two independent parts. When the impact motion and rotary cutting motion are switched, the drill pipe And the drill bit needs to be inserted and pulled out by changing positions back and forth. The impact and rotary cutting cannot be combined, which affects the drilling efficiency and the weight of the machine body is relatively large.

In Patent No. ZL200620081261.1 Rotary Impact Combined Roof Bolter Drilling Machine, the rotating part is installed on the side of the impact mechanism, and the rotating motor drives the rotation of the rotating sleeve through the gear to interfere with the rotation of the ratchet screw rod, which cannot be combined.

In the gyrator of the rock bolt rig with vibration and reversible rotation in the publication number CN101672158A, the vibration part is composed of a ratchet mechanism. When the ratchet rotates, an impact is generated by closing and separating the teeth of the ratchet. The size of the ratchet teeth is very small. Creates very high friction with little impact strength and is poor at breaking hard rock

In the patent No. ZL200420053336.6 impact dual-purpose rock bolter, the impact function is realized through the impact wheel. The disadvantage is that the impact force is very small and cannot be used for drilling hard rocks.

In the power mechanism of the publication number CN103726786A rotary impact hydraulic rock bolt, conical friction clutches, bevel gears and crankshafts are used to generate impact force. The disadvantages are that the mechanism is complicated, maintenance is difficult and the body weight is too large, so it is not suitable for single pneumatic rock bolts. drill rig

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