CN219492206U - Pin bar anti-drop structure of down-the-hole drill bit - Google Patents

Abstract

The utility model discloses a pin anti-drop structure of a down-the-hole drill bit, which comprises a drill bit main body, wherein a pin installation hole is formed in the drill bit main body, a pin for clamping a rotating groove on a rotating shaft part of a wing head is adaptively inserted in the pin installation hole, a pin insertion inlet is formed in the drill bit main body, the pin insertion inlet is correspondingly communicated with the outer end of the pin installation hole, a clamping groove is formed between the outer end of the pin installation hole and the pin insertion inlet, a gland is arranged in the pin installation hole, a compression spring is arranged between the gland and the outer end of the pin, a stop block is arranged in the clamping groove, a sleeve hole is formed in the stop block, a radial positioning boss is formed at the top of the gland and is adaptively connected with the sleeve hole, a stop block inlet is formed in the drill bit main body and is positioned at one side of the pin insertion inlet, and the stop block inlet is communicated with the clamping groove. The pin rod anti-falling structure has high reliability and is easy to assemble and disassemble.

Description

Pin bar anti-drop structure of down-the-hole drill bit

Technical Field

The utility model relates to the field of drill bits, in particular to a pin anti-drop structure of a down-the-hole drill bit.

Background

At present, a type of down-the-hole drill bit for drilling piles is provided with a wing head, the wing head is hinged on a drill bit main body, when the drill bit is used for drilling holes normally, the wing head is kept open through friction force with soil, so that the drilling diameter is relatively enlarged, when the down-the-hole drill bit is used for reversing, as the drill bit main body is provided with a avoidance vacancy capable of containing the wing head, the wing head can be folded in the avoidance hole, so that the down-the-hole drill bit can be slowly reversed, and the down-the-hole drill bit can be pulled out easily at the same time, so that the down-the-hole drill bit of the type is convenient to recycle and reuse. One end of the wing head is provided with a rotating shaft which is inserted into the lower end of the drill bit main body, in order to prevent the rotating shaft from separating from the drill bit main body, the rotating shaft is provided with a rotating groove which is in the shape of an arc groove, a pin rod is arranged to be inserted into the drill bit main body and clamped with the rotating groove, the pin rod is perpendicular to the rotating shaft, but the axis of the pin rod is not intersected with the axis of the rotating shaft, and as the wing head is a main drilling blade, the wing head needs to be replaced after being worn, and the wing head can be pulled away from the drill bit main body after the pin rod is pulled out; however, in order to avoid the pin from falling out during the drilling process due to vibration and centrifugal force, the chinese patent publication No. CN215256043U discloses a "serging structure applied to a down-the-hole drill bit", which is provided with a "fixing plug" for blocking the "locking pin" from falling out of the drill bit main body, the fixing plug being a rubber plug; in practical application, when the down-the-hole drill bit encounters a hard soil layer or rock stratum, the down-the-hole drill bit can generate high temperature, so that a 'fixed plug' is softened or even melted, the fixed plug is caused to lose the function of blocking a 'locking pin', the wing head is easy to drop out of a pile hole, the dropped wing head can prevent re-drilling, and the pile is drilled at an alternative position, so that the problem of insufficient reliability exists in the structure for preventing the pin from being accidentally dropped in the prior art, and improvement is needed.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provide a pin rod anti-falling structure of a down-the-hole drill bit, which has high reliability and is easy to assemble and disassemble.

The aim of the utility model is achieved by the following technical scheme.

The utility model discloses a pin anti-drop structure of a down-the-hole drill bit, which comprises a drill bit main body, wherein a pin installation hole is formed in the drill bit main body, a pin of a rotating groove on a rotating shaft part of a clamping wing head is adaptively inserted in the pin installation hole, a pin insertion inlet is formed in the drill bit main body, the pin insertion inlet is correspondingly communicated with the outer end of the pin installation hole, a clamping groove is formed between the outer end of the pin installation hole and the pin insertion inlet, a gland is arranged in the pin installation hole, a compression spring is arranged between the gland and the outer end of the pin, a stop block is arranged in the clamping groove, a sleeve hole is formed in the stop block, a radial positioning boss is formed at the top of the gland and is adaptively connected with the sleeve hole, and a stop block inlet is formed in the drill bit main body and is positioned at one side of the pin insertion inlet and is communicated with the clamping groove.

Preferably, a spring positioning hole is formed in the outer end part of the pin rod, a positioning hole bottom is formed in the spring positioning hole, the compression spring is arranged in the spring positioning hole, and one end of the compression spring is in abutting connection with the positioning hole bottom.

Preferably, a positioning recess is formed at the bottom of the gland, and the other end corresponding to the compression spring is arranged in the positioning recess.

Preferably, the radial positioning boss is a circular boss, and the sleeve hole is a circular through hole.

Preferably, the shape of the stop block is circular, and the stop block inlet is communicated with the pin rod inserting inlet.

Preferably, the clamping groove is arranged to extend along an arc line centering on the axis of the pin mounting hole.

Compared with the prior art, the utility model has the beneficial effects that: through setting up being formed with the key cartridge entry on the drill bit main part, be formed with the draw-in groove between the outer end of key mounting hole and the key cartridge entry, be equipped with the gland in the key mounting hole, be equipped with compression spring between the outer tip of gland and key, be equipped with the dog in the draw-in groove, be formed with the trepanning on the dog, the top of gland is formed with radial location boss, radial location boss and trepanning adaptation are connected, be formed with the dog entry on the drill bit main part, the dog entry is located one side of key cartridge entry, dog entry intercommunication draw-in groove, because draw-in groove and gland combine compression spring to form firm reliable locate action to the dog, make the reliability of the anti-disengaging structure of key of the utility model high, and easy assembly and disassembly.

Drawings

Fig. 1 is a schematic perspective view of a down-the-hole drill bit having a pin anti-drop structure according to the present utility model.

Fig. 2 is a schematic diagram of a partial structure at a in fig. 1.

Fig. 3 is an exploded schematic view of a down-the-hole drill bit having the pin anti-slip structure of the present utility model.

Fig. 4 is a schematic view showing a process of inserting the pin of the present utility model into the pin mounting hole.

Fig. 5 is a schematic view of the gland installation process of the present utility model.

Fig. 6 is a schematic view of a block mounting process of the present utility model.

FIG. 7 is a schematic cross-sectional partial structural view of a down-the-hole drill bit having the pin anti-slip structure of the present utility model.

Fig. 8 is a schematic top perspective view of the pin of the present utility model.

Fig. 9 is a schematic cross-sectional view of the gland of the present utility model.

Fig. 10 is a schematic perspective view of a stopper according to the present utility model.

FIG. 11 is a schematic perspective view of a bit body and bit combination according to the present utility model.

Fig. 12 is a schematic view of a partial structure at B of fig. 11.

Fig. 13 is a schematic top view of a bit body according to the present utility model.

Description of the reference numerals: a bit body 1; pin mounting holes 100; pin cartridge inlet 101; a card slot 102; a stopper inlet 103; a wing tip 2; a rotation shaft 21; the rotation groove 211; a pin 3; a spring positioning hole 301; positioning a hole bottom 3011; a compression spring 4; a gland 5; positioning the recess 501; a radial positioning boss 51; a stopper 6; trepanning 601.

Description of the embodiments

The utility model is further described below with reference to the accompanying drawings.

The pin anti-drop structure of the down-the-hole drill of the present utility model, as shown in fig. 1, comprises a drill body 1, as shown in fig. 11 to 13, the drill body 1 is formed with a pin installation hole 100, as shown in fig. 3 and 7, a pin 3 fitted with a rotation groove 211 on a rotation shaft portion 21 of a chuck wing head 2 is inserted into the pin installation hole 100, as shown in fig. 12 and 13, a pin insertion inlet 101 is formed on the drill body 1, the pin insertion inlet 101 corresponds to an outer end (herein, "outer end" means an end of the pin installation hole 100 relatively far from a rotation axis of the drill body 1), and a chuck groove 102 is formed between the outer end of the pin installation hole 100 and the pin insertion inlet 101, that is, the clamping groove 102 belongs to the internal structure of the drill bit body 1, as shown in fig. 7, a gland 5 is arranged in the pin installation hole 100, a compression spring 4 is arranged between the gland 5 and the outer end part of the pin 3, a stop block 6 is arranged in the clamping groove 102, in other words, the clamping groove 102 is clamped with the stop block 6, as shown in fig. 10, a sleeve hole 601 is formed on the stop block 6, as shown in fig. 9, a radial positioning boss 51 is formed at the top of the gland 5, as shown in fig. 2 and 7, the radial positioning boss 51 is in fit connection with the sleeve hole 601, as shown in fig. 12 and 13, a stop block inlet 103 is formed on the drill bit body 1, the stop block inlet 103 is positioned on one side of the pin insertion inlet 101, in other words, the stop block inlet 103 is not opposite to the pin insertion inlet 101, and the stop block inlet 103 is communicated with the clamping groove 102.

The working principle of the pin anti-drop structure of the present utility model is briefly described as follows: as shown in fig. 3 and 4, the rotary shaft 21 of the wing head 2 is first inserted into the bit body 1, wherein the axis of the rotary shaft 21 is parallel to the rotation axis of the bit body 1, then the pin 3 is inserted through the pin insertion inlet 101 and into the pin installation hole 100, the pin 3 is snapped into the rotation groove 211 on the rotary shaft 21, as shown in fig. 5, the compression spring 4 is placed at the outer end of the pin 3, at which time the compression spring 4 is already partially positioned in the pin installation hole 100, then the gland 5 is covered on the compression spring 4, as shown in fig. 6, the stopper 6 is then placed into the stopper inlet 103, the gland 5 is forcibly pushed into the pin installation hole 100, the compression spring 4 is elastically compressively deformed and the gland 5 is entirely sunk into the pin installation hole 100, as described above, since the stopper inlet 103 is communicated with the snap groove 102, then the stopper 6 can be pushed into the snap groove 102 in a direction perpendicular to the pin 3 by hand or a tool, the sleeve hole 601 is aligned with the radial positioning boss 51, then the compression spring 4 is released, and the elastic restoring force of the compression spring 4 pushes the gland 5 into the sleeve hole 601, so that the radial positioning boss 51 is pushed outward, as to push the boss 601, thereby fitting the elastic restoring force of the gland 5 into the boss 601, and thus radial boss 601 is completed. As shown in fig. 7, since the stopper 6 is disposed in the clamping groove 102, the stopper 6 and the gland 5 cannot be separated from the drill bit body 1 directly along the axial direction of the pin 3, and since the radial positioning boss 51 is adapted to be connected with the sleeve hole 601, and the gland 5 is also partially disposed in the pin mounting hole 100, the stopper 6 cannot be separated from the clamping groove 102 directly along the radial direction of the pin 3 due to the positioning action of the radial positioning boss 51, and since the compression spring 4 is in an elastic compression state, the elastic restoring force of the compression spring 4 drives the stopper 6 to press against the side wall of the clamping groove 102, so that the pin anti-separation structure of the utility model is stable, and the pin 3 cannot be separated from the drill bit body 1 due to vibration; when the pin 3 needs to be detached, under the visual sense of fig. 7, the pressing cover 5 needs to be pressed with a large force, the compression spring 4 is further elastically compressed and deformed, the radial positioning boss 51 is separated from the stop block 6 downwards, then the stop block 6 is pushed out to the stop block inlet 103 along the radial direction of the pin 3 by hands or tools, the pressing cover 5 is released, the pressing cover 5 and the compression spring 4 are taken out through the pin inserting inlet 101, the pin 3 can be pulled out from the pin mounting hole 100, the pressing spring 4 needs to be further elastically compressed and deformed by a large external force to unlock the stop block 6 when the pin 3 is detached, and as the clamping groove 102 is positioned in the surface of the drill bit main body 1, no unexpected condition for unlocking the stop block 6 exists in the working process or the transportation process of the down-the drill bit, that is, namely, the reliability of the pin anti-disengaging structure of the utility model is very high, from the above, the pressing cover 5 and the stop block 6 are easy to detach through the initiative and specific operation process, the wing head 2 is convenient, and the installation process of the compression springs 4, 5 and 6 is easy. As shown in fig. 7, the inner end of the pin 3 is pressed against the bottom of the pin mounting hole 100 by the elastic restoring force of the compression spring 4, so that the relative rotational friction between the pin 3 and the inner wall of the pin mounting hole 100 is avoided, and the abrasion of the wall of the pin mounting hole 100 can be reduced.

Further, as shown in fig. 8, a spring positioning hole 301 is formed in the outer end portion of the pin 3, a positioning hole bottom 3011 is formed in the spring positioning hole 301, as shown in fig. 7, a compression spring 4 is disposed in the spring positioning hole 301, and one end of the compression spring 4 is abutted against the connecting positioning hole bottom 3011, so that the compression spring 4 can be positioned, and in the assembly process, the compression spring 4 is locally subjected to the positioning action of the spring positioning hole 301, and then the compression spring 4 can be prevented from bouncing off when the gland 5 is covered and pressed down.

Further, as shown in fig. 9, a positioning recess 501 is formed at the bottom of the pressing cover 5, and as shown in fig. 7, the other end of the compression spring 4 is disposed in the positioning recess 501, so that the positioning action on the compression spring 4 is further enhanced, and the pressing cover 5 is prevented from sliding off the end of the compression spring 4 when the pressing cover 5 is pressed down in the process of assembling the stopper 6.

Further, as shown in fig. 5 and 9, the radial positioning boss 51 is a circular boss, and as shown in fig. 10, the sleeve hole 601 is a circular through hole, so that the directivity of the stopper 6 is not required to be considered in the process of sliding the stopper 6 from the stopper inlet 103 into the card slot 102, so that the stopper 6 is convenient to assemble.

Further, as shown in fig. 10, the outer shape of the stopper 6 is circular, which is advantageous in reducing friction resistance between the outer edge of the stopper 6 and the wall surface of the passage from the stopper inlet 103 to the clamping groove 102, so that the stopper 6 is easy to be assembled and disassembled, as shown in fig. 12 and 13, the stopper inlet 103 is arranged in communication with the pin inserting inlet 101, so that a tool or hand can be directly moved from the stopper inlet 103 to the pin inserting inlet 101, so that the stopper 6 is easy to be assembled and disassembled, and the clamping groove 102 is easy to be processed, particularly, the clamping groove 102 can be processed and formed by a T-shaped milling cutter.

Further, as shown in fig. 13, the clamping groove 102 is set to extend along an arc line with the axis of the pin installation hole 100 as the center, which is favorable for making the clamping groove 102 have a larger contact length with the outer edge of the stop block 6, and is favorable for the clamping groove 102 to firmly position the stop block 6, more specifically, the clamping groove 102 is set in a semicircular shape, the clamping groove 102, the stop block 6 and the gland 5 are set in a coaxial line, as shown in fig. 13, the stop block inlet 103 and the pin insertion inlet 101 can be set in a circular shape, and in order to form the structure of the clamping groove 102, the radius of the pin insertion inlet 101 is smaller than that of the clamping groove 102.

Claims (6)

1. The utility model provides a down-the-hole drill's round pin stick anticreep structure, includes bit body (1), bit body (1) are formed with round pin stick mounting hole (100), round pin stick (3) that adaptation cartridge has rotation recess (211) on pivot portion (21) of joint wing head (2) in round pin stick mounting hole (100), its characterized in that: be formed with round pin stick cartridge entry (101) on drill bit main part (1), round pin stick cartridge entry (101) correspond the intercommunication the outer end of round pin stick mounting hole (100), the outer end of round pin stick mounting hole (100) with be formed with draw-in groove (102) between round pin stick cartridge entry (101), be equipped with gland (5) in round pin stick mounting hole (100), gland (5) with be equipped with compression spring (4) between the outer tip of round pin stick (3), be equipped with dog (6) in draw-in groove (102), be formed with trepanning (601) on dog (6), the top of gland (5) is formed with radial location boss (51), radial location boss (51) with trepanning (601) adaptation connection, be formed with dog entry (103) on drill bit main part (1), dog entry (103) are located one side of round pin stick cartridge entry (101), dog entry (103) intercommunication draw-in groove (102).

2. The pin anti-drop structure of down-the-hole drill bit according to claim 1, wherein: a spring positioning hole (301) is formed in the outer end portion of the pin rod (3), a positioning hole bottom (3011) is formed in the spring positioning hole (301), a compression spring (4) is arranged in the spring positioning hole (301), and one end of the compression spring (4) is in abutting connection with the positioning hole bottom (3011).

3. The pin anti-drop structure of down-the-hole drill bit according to claim 2, wherein: a positioning recess (501) is formed at the bottom of the gland (5), and the other end corresponding to the compression spring (4) is arranged in the positioning recess (501).

4. The pin anti-drop structure of down-the-hole drill bit according to claim 1, wherein: the radial positioning boss (51) is a round boss, and the trepanning (601) is a round through hole.

5. The pin anti-drop structure of down-the-hole drill bit according to claim 4, wherein: the shape of the stop block (6) is circular, and the stop block inlet (103) is communicated with the pin inserting inlet (101).

6. The pin anti-drop structure of down-the-hole drill bit according to claim 5, wherein: the clamping groove (102) is arranged to extend along an arc line taking the axis of the pin installation hole (100) as the center.