KR200242808Y1 - Down The Hole Separation Type Bit - Google Patents

Abstract

The present invention relates to a separate drill bit, fastening so that the bit head 30 and the bit body 20 on the hammer shank 40 side hitting the pin directly hit the ground 50 or rock End (24) 36 and fastening grooves 28, 32 are tapered at a certain angle, protruding and grooves formed in the form of a round screw to facilitate the fastening operation, but also to maintain a reliable coupling state as well as to remove the operation. It can be made in a simple structure, for this purpose, the bit body 20 is formed at the bottom of the head fastening end 24 or the head fastening groove 24 or the head fastening groove 28 is formed to be tapered in the form of a round screw On the other hand, the bit head 30 is screwed to the bit body 20 is also characterized in that the body fastening groove 32 or the body fastening end 36 of the upper end is tapered or protruding to be tapered in the form of a round screw do.

Description

Down The Hole Separation Type Bit}

The present invention relates to a separable drill bit which can be easily coupled or separated by being rotated and rotated separately from the bit head and the bit body, and more specifically, the bit head directly hitting the ground or rock The fastening end and the fastening groove are tapered at a certain angle so that the hammer body's bit bodies can be screwed together, and the protrusions and grooves are formed in the form of round screws, so that the fastening operation can be easily maintained and a reliable coupling state can be maintained. Operation also relates to a separate drill bit that can be made structurally simple.

In general, the downhole bit is a hitting means used for surface drilling such as mine, earth anchor, geological survey, groundwater development by fastening to a hammer. Alternatively, it transfers to rock to break the ground and rock.

The drill bit is composed of a body part subjected to impact transmitted from the hammer and a head part embedded with high-strength blow pins that transmit the impact to the rock, and the service life of the drill bit is determined by wear and break of the hit pin. In general, the life of the hitting pin can be shortened depending on the irregular rock type and environmental changes.

In addition, the drill bit is fixed to the beat body is inserted into the hammer shank, the externally exposed bit head hits the ground or rock according to the hydraulic operation of the hammer, at this time, because the striking pin of the bit head hit the ground or rock, the other configuration Compared with the parts, the blow pins have a severe deficiency.

By the way, the punch bits so far can not replace only the blow pin that is easy to hit the deficiency because the bit head is formed integrally with the bit body, and as a result, the entire punch bit must be replaced. Even this possible bitbody had a problem that had to be discarded before its lifetime.

On the other hand, in the separate drilling bit of 20-2000-03640 (Utility Model Registration No. 0228092) filed by the inventors to solve the problem of the integral drilling bit in which the bit head is integrally formed in the bit body, In addition, the bit head, which strikes the striking pin directly on the rock, is separated from the bit body so that only the bit head can be replaced without having to replace the entire component when the striking pin is severely bound.

However, the above-mentioned separate punched bit has a fastening end and a fastening groove formed in the bit body and the bit head, respectively, in the form of protrusions or recesses having the same diameter as in the conventional screw structure, and the fastening end is the fastening groove during the fastening operation. If it is not fastened in the same line, not only the fastening work itself is difficult, but also the final state of engagement is poor, as well as the tightening state is difficult.

In addition, since the cutting shape of the thread is straight, if the machining accuracy of the thread is inaccurate, the final tightening state is structurally weak, and crack breakage can easily occur due to external impact. There was a structural inconvenience in that the entire threaded length section had to be rotated.

The present invention is conceived to improve the above-mentioned inconvenience of the above-mentioned separate drilling bit, the fastening end so that the bit head and the hammer body of the bit head hitting the blow pin directly on the ground or rock can be screwed together The fastening groove is rounded and tapered at a certain angle to form a protrusion, and the groove is formed so that the fastening operation can be maintained easily and reliably, and the separating operation can be made structurally simple. There is a purpose.

1 is a perspective view of the basic structure separated state of the removable drill bit according to the present invention.

Figure 2 is a structural diagram of the basic structure separated state of the removable drilling bit according to the present invention.

Figure 3 is a structural diagram of the application structure separation state of the removable drill bit according to the present invention.

Figure 4 is a state of use of the hammer shank coupled to the drilled state punched bit of the present invention.

Explanation of symbols on the main parts of the drawings

10: punch bit 20: beat body

22: hammer fixed wing 24: head fastening

26: foot valve 28: head fastening groove

30: bit head 32: body fastening groove

34: blow pin 36: body fastening

38: positioning jaw 40: hammer shank

The present invention for achieving the above object is a separable drill bit made to be fitted to the hammer shank in the longitudinal direction to be coupled to the bit body and the bit head protruding the blow pin is projected to hit the ground or rock. In the bit body, the head fastening or grooved head fastening or head fastening groove formed in the form of a tapered round screw shape at the lower end thereof, while the bit head screwed to the bit body is also Body fastening groove or body fastening end is characterized in that the groove formed or projected to be tapered in the form of a round screw.

In addition, the bit body is characterized in that the data form of the head fastening end or the head fastening groove is inclined about 5-10 ° like the body fastening groove or body fastening end of the bit head.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 illustrate the separated state of the basic structure before the bit body 20 and the bit head 30 constituting the punch bit 10 according to the present invention are integrally coupled to each other, and FIG. 3 is the present invention. The bit body 20 and the bit head 30 constituting the punch bit 10 by the application structure is shown in a separated state before being integrally coupled with each other, and FIG. 4 is a combined state punch bit 10 of the present invention. It shows the state of use by fitting the hammer shank 40 to.

As shown in the figure, the removable punch bit of the present invention is the bit head 30 is directly separated from the bit body 20, the striking pin (34) is directly hit the ground 50 or rock, striking pin ( In the case where the degree of cohesion of 34 is severe, the bit head 30 and the bit body 20 are of course separated from each other by screwing together so that only the bit head 30 can be replaced without using the entire components. ), The fastening ends 24, 36 or fastening grooves 28, 32 are rounded screws, respectively, so that the fastening can be reliably screwed together so that the fastening state can be maintained reliably and the separation operation can be made structurally simple. It is tapered at an angle to the shape.

That is, the bit body 30 is fastened to the bit body 20 so that the bit body 20 and the bit head 30 can be easily screwed to each other structurally to form a separate drilled bit 10 As shown in the basic structure of Figs. 1 and 2, the lower end of 20 has a round screw shape, which protrudes downwardly from the head fastening end 24 to be narrowed outward, or as shown in the application structure of Fig. 3. As a round screw shape, the head engaging groove 28 is formed to be recessed upwardly and gradually narrowed inward.

In addition, the upper end of the bit head 30 so as to be easily screwed in correspondence with the head fastening end 24 protruding from the bit body 20 or the head fastening groove 28 formed in the recess is also shown in Figure 1 and As shown in the basic structure of FIG. 2, the body fastening groove 32, which is recessed downwardly inwardly as a round screw shape, is recessed, or as shown in the application structure of FIG. The fastening ends 36 are protruded to allow these bit heads 30 and the bit bodies 20 to be integrally coupled as structurally stable screwing.

In particular, the fastening ends 24, 36 or fastening grooves 28, 32, which are protruded or recessed in the bit body 20 and the bit head 30, respectively, are easy to fasten with each other and have a structurally coupled state. The tapered shape is preferably processed at an inclination angle of about 5-10 ° so that it can be stabilized, and the bagging fastening groove 32 formed in the recess in the bit head 30 has a positioning jaw 38 at its outer end. ) Is preferably formed so that the head fastening end 24 of the bit body 20 can be firmly fixed while being structurally stable.

Meanwhile, the bit body 20 in which the head fastening end 24 or the head fastening groove 28 is formed at the lower end thereof has a circumferential edge so that the hammer shank 40 can be fitted and fixed in the longitudinal direction as shown in FIG. 4. A plurality of hammer fixed wings 22 are formed at a predetermined interval on the outside, and the foot valve 26 is formed at the upper end thereof so that the hydraulic power through the hammer shank 40 can be transferred.

In addition, the bit head 30 in which the body fastening groove 32 or the body fastening end 36 is formed at the upper end portion has a plurality of striking pins 34 directly contacting the ground and protruding as a circular protrusion.

As described above, the separated punched bit 10 of the present invention is configured by separating the bit body 20 and the bit head 30 and being integrally formed by screwing each other, and the impact energy transmitted through the hammer shank 40 is the bit body ( 20 is transmitted to the bit head 30 exposed to the outside of the bottom of the hammer shank 40 while the ground 50 or the rock is hit by the striking pin 34 of the bottom of the bit head 30 slowly broken You lose.

Then, if the deficiency of the blow pin 34 is severe by the drilling operation, the bit head 30 protruding the blow pin 34 without having to replace the entire components of the punch bit 10 from the hammer shank 40 ) Only the separation from the bit body 20 to replace the normal bit head 30 to fix the coupling can continue the drilling operation, and at this time the fastening operation between the bit body 20 and the bit head 30 Since the fastening ends 24 and 36 and the fastening grooves 28 and 32 are tapered rounded at an angle, the fastening ends 24 and 36 can be easily and stably mutually fastened.

In addition, the separation operation between the bit body 20 and the bit head 30 also includes a length section in which the fastening ends 24 and 36 and the fastening grooves 28 and 32 are rounded and tapered. Separation can be easily carried out even if the whole is not rotated, and the separation operation can be made simpler and easier as well as easy and stable coupling operation.

As described above, according to the separate type drill bit of the present invention, the fastening end and the fastening groove respectively formed on the bit body and the bit head are inclined to be tapered at a certain angle, unlike the conventional screw structure, and thus, as the fastening groove during the fastening operation. Even if the fastening end is not inserted in the same line, the fastening action can be guided to the center position of the coupling part, so that the fastening work itself can be facilitated, as well as the round screw shape and the final coupling state due to the structural characteristics of the tapered structure. And tightness can be secured.

In addition, since the cutting shape of the thread is not a straight line but a round shape, even when the machining accuracy of the thread is relatively inaccurate, it is possible to prevent structurally weakening of the finally tightened fastening state, and furthermore, Not only can the breakage be significantly reduced, but also the separation can be easily performed without separating the entire threaded length section even when the separation operation can be provided.

Claims (2)

Bit body 20 which is installed and fitted into the hammer shank 40 in a longitudinal direction and the bit head 30 protruding the hitting pins hitting the ground or rock are formed in the separable perforated bit can be screwed together In The bit body 20 has a head fastening end 24 or a head fastening groove 28 having a protrusion or groove formed in the form of a screw at the bottom thereof is tapered in the form of a round screw, and screwed to the bit body 20. The bit head 30 is coupled to the upper body fastening groove 32 or the upper end of the body fastening 36, characterized in that the recessed groove formed or protruded to be tapered in the form of a round screw. The method of claim 1, The bit body 20 has a data shape of the head fastening end 24 or the head fastening groove 28, 5-10 ° like the body fastening groove 32 or the body fastening end 36 of the bit head 30. Detachable punch bit, characterized in that the inclined in and out.