SU1247503A1 - Drilling bit - Google Patents

Description

FIG.

The invention relates to drilling in the mining industry, and more specifically to the design of a combined drilling tool with collapsible blades, intended for use with submersible hammer hammers.

The purpose of the invention is to simplify the design of the bit and increase the reliability of its operation.

Figure 1 shows a drill bit, a general view; 2 shows a projection onto a horizontal plane; on fig.Z - isometric image of the design of the blade.

The drill bit includes body 1, blades 2, fastening fingers 3, and cotter pins 4, Case 1 has grooves 5 with displaced axes relative to axes of symmetry of the body. Three blades 2 are mounted in these slots. The 6 holes of the housing 6 serve to supply the exhaust gas to the bottom of the well. The housing 1 ends with a profiled shank intended for connection with a pneumatic impact mechanism that changes the impact energy depending on the change in the strength of the drilled rock.

The blade 2 is made step-shaped and reinforced with carbide inserts 7. The surface and the end part of the blade facing the axis of the bit, forms a side

g

0

surface b, which coincides with the corresponding plane of symmetry of the bit body, an angle of 120 ° and has protrusions 8. A longitudinal groove 9 and a through hole 10 are made on the surface b to fix the blade 2 relative to the body 1 with the fixing finger 3.

The bit is collected in the following order.

The blades 2 are installed in the grooves 5 of the housing 1 so that the protrusion 8 on one blade fits into the longitudinal groove of the other blade. Then, all the blades are fixed relative to the bit body with the fastening fingers 3 and are secured with pin clips 4.

In the process of drilling during wear or breakage of carbide inserts 7, when it becomes necessary to replace one or more blades, it is enough to unpin and remove the finger 3, then slide the blade out of the groove, replacing it with a new one. The end protrusions 8 and grooves 9 do not allow the blade to fall out of 2 out of 5, even if there is only one fastening pin 3. This improves the reliability of the design and is convenient when replacing the blades above the well. In addition, this design solution eliminates the loss of blades during an emergency fracture simultaneously two mounting fingers.

2

Compiled by Y. Palashchenko

Editor M. TovtinTehred I. Veres Corrector L. Patay

Order 4094/30 Circulation 548 Subscription

VNIIPI USSR State Committee

for inventions and discoveries

113035, Moscow, Zh-35. Raushsk nab. 4/5

Branch PPP "Patent, Uzhgorod, st. Project, 4

FIG. 3

Claims (1)

A DRILL BIT containing a body with grooves, removable blades placed in the grooves, and fasteners, characterized in that, in order to simplify the design of the bit and increase the reliability of its operation, the axis of the grooves are offset relative to the axis of symmetry of the body, one of the walls of each groove coincides with the plane passing through the axis of the housing, while the edge of the blades adjacent to this wall has a longitudinal groove, and the end part of the blades is provided with a protrusion for placement in the longitudinal groove of the adjacent blade. SU. „, 1247503 FIG. 1