CN2234836Y

CN2234836Y - Spiral drill rod

Info

Publication number: CN2234836Y
Application number: CN 95228772
Authority: CN
Inventors: 张云林
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-12-19
Filing date: 1995-12-19
Publication date: 1996-09-11
Anticipated expiration: 2005-12-19

Abstract

The utility model discloses a spiral drill rod which is suitable for soft rock. The utility model is characterized in that two or three dovetail convex parts are homogeneously arranged on the cross-section of the extension rod of the drill rod. By the design, the spiral path on the extension rod of the spiral drill rod forms an up push angle, which has the advantages of timely powder-discharging, acceleration of drilling rate, and less seizing-up of the drill. The integration of the spiral path on the extension rod and the main body of the extension rod reduces the damage to the utility model and extends the service life of the drill.

Description

A kind of twist drill rods

The utility model relates to a kind of soft rock boring rod set, specifically a kind of twist drill rods.

In that various soft rock coal petrographys are carried out the boring rod set that depth hole drill is at the moment adopted, mostly be the twist shape drilling rod at present.A kind of twist drill rods commonly used, its cross section is a prismatic, the two pass spiral is arranged on the extension bar, its pitch is 80mm, the spiral height is 5mm, this drilling rod in use, because its gliding angle is big, the powder that gets out can not in time be discharged, so bit freezing very easily, for addressing this problem, CN2165222 discloses a kind of soft rock boring rod set (RZZ type drilling rod), and this installs by the water jacket base, base, the drilling rod base, extension bar, drill bit is formed, and its design main points are that the extension bar in the boring rod set is made up of steel pipe and steel band, steel band is by pitch requirement (pitch is 72mm), is wrapped on the steel pipe and is welded.Though this drilling rod is alleviated to some extent to the generation of bit freezing phenomenon, but because still there is the gliding angle of certain angle in it, and pitch is shorter, so still can not reduce the generation of bit freezing phenomenon significantly, in addition, the extension bar of this drilling rod is welded as a whole by two parts, and its fastness is not strong, has influenced its service life.

The purpose of this utility model just provides that a kind of row's powder ability is strong, and rate of penetration is fast, bit freezing not, long-lived twist drill rods.

The purpose of this utility model is to realize like this, designed twist drill rods still includes the basic element of character of common drilling rod, as base, threaded extension bar etc., improved main points are the design to the angle in the spiral road of its extension bar, be that spiral road on the extension bar is 2-3 swallow-tail form projections of evenly arranging from the cross section of extension bar, thisly push away the angle with regard to the spiral road exists on the original drilling rod gliding angle is changed into.

The twist drill rods of design like this, the angle of the spiral on its extension bar is presented and is pushed away the angle, so help getting out the timely discharge of powder, accelerated rate of penetration, also significantly reduced simultaneously the generation of bit freezing phenomenon, the spiral road and the extension bar main body of adding on the extension bar are one, should not damage, thereby prolong service life of drilling rod greatly.

Be described in further detail the utility model below in conjunction with the drawings and the specific embodiments.

Fig. 1 is an extension bar structural representation of the present utility model.

Fig. 2 is A-A sectional view of Fig. 1.

Fig. 3 is the cross-sectional view of another embodiment of the utility model.

Fig. 4 is the cross-sectional view of another embodiment of the present utility model.

The utility model comprises the extension bar with base and band spiral, the profile of its extension bar as shown in Figure 1, be twisted shape, make extension bar and can select 65 manganese steel materials for use, roll into shaped steel, the cross section of steel as shown in Figure 2, promptly symmetry arrangement has two swallow-tail form projectioies (2) on (1) one group of diagonal angle of prismatic main body, and the heating of this shaped steel is twisted system, after heat treatment promptly made and push away dihedral double helix road extension bar.Also steel can be rolled into its cross section shape as shown in Figure 3, promptly on hexagon main body (3), be evenly distributed with 3 swallow-tail form projectioies, through heating the system of twisting, heat treatment is made and is pushed away dihedral triple helical road extension bar, make its row's powder better effects if, if steel are rolled into a side rectangular (4) of swallow-tail form projection as shown in Figure 4, can reach goal of the invention equally in order further to improve row's powder effect, pitch height on the extension bar can be made as 100-200mm, like this, during boring, space between petrosal foramen and the drilling rod can further be strengthened, and the powder that gets out is difficult for jammed together being difficult to discharges, and causes bit freezing.

According to the above twist drill rods that designs and produces, row's powder is effective, rate of penetration is fast, tensile strength is high, long service life.

Claims

1, a kind of twist drill rods includes base and threaded extension bar, and it is characterized in that has 2-3 swallow-tail form projectioies of evenly arranging on the cross section of extension bar.

2, twist drill rods according to claim 1 is characterized in that a side of said swallow-tail form projection is rectangular.

3, twist drill rods according to claim 1 is characterized in that the pitch in the said threaded extension bar is 100-200mm.