RU1796020C - Coring drilling bit - Google Patents

Abstract

The inventive drill head includes a housing with a pneumatic hammer, a gearbox and a spindle assembly connected through an intermediate shaft, consisting of a gear ring fixed to the spindle with a chuck and a shank, connected by a gear of the intermediate gearbox shaft, an electric motor is installed on the plate, the shaft of which has a stepped shape with the front part in the form of a washer, the middle part in the form of a stepped cylinder. a with a tapered bevel and the tail part with a keyway. The electric motor is connected to the gearbox via a key bush. The drill head is equipped with a locking device made in the form of a stopper, which ends with its end in the transverse groove of the rod and the locking sleeve connected to it. In addition, the drill head has a spacer mounted on the board 2 and made of parts of the corners and channel. When the drill head is operating, the torque generated by the electric motor transmits rotation through the key sleeve through the drive shaft and the gear block rigidly connected to it. Then, by two stages of gears, the rotation is transmitted to the spindle, which transmits the moment to the chuck and to the shaft rigidly connected to it, which transmits rotation to the boom by conical connection. In this case, a constant number of revolutions and a constant moment on the bar are provided. 4 ill .; GG: chs (L

Description

The invention relates to the mining industry and can be used in mining technology.

An analogue of the proposed drill head can be a universal rotary-impact drill with an electric drive, commercially available from the Novogorlovsk Machine-Building Plant named after S.M. Kirov (Operating Instructions 306800.000.000 RE with application 306800.000.00 E1 - installation of a drill shaft UBSh-313A or UBSh -252).

Universal drill head consists of: electric drive, gear-rotator and hammer, mechanical

hammer, shank and flushing sleeve.

The impact mechanism consists of: a drive gear, inside which a bronze splined sleeve is fixed, transmitting rotation to a splined drummer with a cam rim, which is covered by two pairs of rollers and rotates in a reciprocating motion, striking through the intermediate striker on the shank of the rod.

The disadvantage of the universal drill bit is that when drilling hard rock with a strength of 10 or higher units on a prof. M.M. Protod Konova drilling efficiency drops sharply due to small

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impact energy with increasing rock strength due to accident rate, the reliability of the parts of the impact mechanism decreases. .

The second analogue is a pneumatic rotary-impact drill head, manufactured by the Old Oskol Mechanical Plant, BGA-Sh (instrumentation for operating 1911.00.000 PS, Belgorod, 1987).

BGA-IM consists of an air motor, a rotator gearbox, an air hammer and a flushing sleeve.

The disadvantage is due to the insufficient number of revolutions of the rod and the torque on it.

The prototype was chosen as a puncher with independent rotation of the M-2 model, manufactured by the Old Oskol mechanical plant. The M2 perforator consists of a pneumatic motor, planetary gearbox, a hammer, a shank (adapter) and a flushing sleeve .; j

Rotary hammer Ш has the following disadvantages: ... . :, ::. . :

high consumption of pneumo-rHII and. low productivity; : .-: Jp; ; . -.

complicated connection with the boom with the bar ;; ; : Щ:.:

insufficient moment and.), a constantly changing number of broken rods.

The aim of the present invention is to increase the efficiency of pneumatic and hydraulic drilling (chis: drill heads.; /: ..::

This goal is achieved by employing a rotation drive; $; Štrumbnta (rods) - electric motor; and locking unit.

This goal is achieved due to the fact that the drill head, including a hammer placed in the housing, a rotary drive kinematically connected by means of a gearbox with a shank, and a drill rod connected to the shank by means of a conical connection, are provided with a stop assembly, which is made in the form of an enveloping drill rod and a shank of the lock sleeve, wherein the lock sleeve is connected to the drill rod and the shank by means of a stop and screws, respectively, and an electric motor is used as a rotation drive s. Owing to such a design and use of an electric motor as a rod rotation drive, it becomes possible to drill holes in strong abrasive rocks due to the fact that a constant number of revolutions of the tool (crown, cutter) and sufficient moment on it are saved in the drilling process.

In connection with an increase in the drive power of the rotator due to the electric motor, a locking unit is introduced into the design of the drill head for reliable closure

5 of the rod, protecting it from idling in the liner, thereby ensuring stable operation of the drill head as a whole.

The pneumatic energy consumption is reduced three times in comparison with the known pneumatic drilling rigs. Volumetric coverage and locking of the rod body over a longer length by the locking assembly allows:

5 to protect from premature failure of the rod (twisting in the weakened: conical end), thereby reducing the consumption of drill steel;

the body of the shank in the conical bore runs to break.

In FIG. 1 is a General view of the drill head on the feeder of an electric drilling rig (UBSh-252, UBSh-313A); in FIG. 2 is a section AA of the stopper, in FIG. 3 - section

5 B-B of the locking sleeve by fixing screws; in FIG. 4 is a general view of the locking assembly. The drill head consists of:. an electric motor 1 with a power of 7.5-11 kW transmitting torque through

0 sleeve (sleeve) 2 to the gearbox of the rotator 3 and to the shaft passing freely through the flushing sleeve 4, shanks 5. The shank 5 with a conical connection and fixed to

 the locking unit b are connected to

5 by a rod 7. A pneumatic hammer 8 with a reducer 3 is attached to a spacer 9, which is mounted on the plate 10 of the feeder 11. A motor 1 is also located there. To actuate the hammer 8 to a certain hose 12, compressed air is supplied through an oil lubricator 13, which is controlled by air crane 14. The locking assembly b (Figs. 5-6-7) is designed for stable operation of the connection of the shank 55 of the rod 7.

The assembly consists of a locking sleeve 15, a stopper 16, a washer 18, fixing screws 17.. The locking sleeve 15 simultaneously covers the conical part of the shank 5 and the body of the rod 7. The locking sleeve 15 is rigidly fixed to the shank 5 with screws 17 located relative to each other at an angle of 120 °.

At the other end of the locking sleeve 15

5, radial holes 19 of different diameters are drilled, larger for the head of the stopper 16 with a spring washer 18, and another, small, with a screwed thread to screw in the stopper 16. The drill rod 7 has a transverse groove 19 formed along the chord

2-3 mm high. The groove 19 includes a screw stop 16. The groove 19 is slightly larger than the diameter of the screw stop 16, providing for the axial displacement of the rod 7 when operating in the rotary-shock drilling mode.

When the shank 5 rotates, the moment to the rod 7 is transmitted simultaneously by a conical connection: the conical part of the shank 5 - the conical tip of the rod 7 and the conical part of the shank 5 - screws 17 - locking sleeve 15 - groove 16 - groove 19 on

0

staff 7. Thus, the locking assembly - device 6. transferring the moment of rotation from the shank 5 to the rod 7, protects them from the effects of torsional deformation and vibration. The use of the locking assembly 6 allows to create volumetric coverage of the conical part of the shank 5 and increase its strength. The field of application of electric drilling rigs is expanding both in various mining and geological conditions, as well as in terms of productivity and feasibility.

Claims (1)

The claims A drill head including a pneumatic or hydraulic hammer located in the housing, a rotational drive kinematically connected by means of a gearbox with a shank, and a drill rod connected to the shank by means of a conical connection, distinguishing with the aim of To increase the efficiency of drilling hard and abrasive rocks, it is equipped with a locking assembly, which is made in the form of a locking sleeve covering the drill rod and shank, while the locking sleeve is connected to the drill rod and shank by means of a stop and screws, respectively, and an electric motor is used as a rotation drive.