Down-hole roller bit

Abstract

The down-the-hole roller bit comprises a bit body, a channel for water to flow is formed in the bit body, the front end, facing the bit body, of the channel is divided into a plurality of flow channels and penetrates through the front end of the bit body, a plurality of first alloy teeth are installed on the end face of the front end of the bit body, and the down-the-hole roller bit further comprises a reaming sleeve and a locking assembly; the broaching sleeve is coaxially arranged at the front end of the drill bit body in a sleeving mode, a chamfering face is arranged at the front end of the broaching sleeve, a plurality of second alloy teeth are installed on the chamfering face in the circumferential direction, and the locking assembly locks the broaching sleeve on the drill bit body. The reaming sleeve is installed on the drill bit body, the diameter of the down-the-hole drill can be increased, the whole drill bit does not need to be replaced, and a drilled hole can be conveniently reamed through the down-the-hole drill.

Description

Technical Field

[0001] The utility model relates to the field of drill bits, in particular to a down-the-hole roller drill bit. Background Art

[0002] The technology of down-the-hole hammer drilling includes the supply of pressurized fluid to the drill bit at the bottom of the borehole via the drill string. Down-the-hole drill bits are used in down-the-hole hammer drilling technology. There are four main end face designs currently used, namely, convex end face type, flat end face type, concave end face type and deep concave center end face type, so as to reduce the influence of hole depth on rock drilling efficiency. The life of the down-the-hole drill bit mainly depends on the impact resistance and wear resistance of its column teeth.

[0003] The utility model patent with announcement number CN205577864U discloses a down-the-hole drill bit, which solves the problem in the prior art that the drill bit has a high scrap rate due to damage to the alloy teeth. The key points of its technical solution are a down-the-hole drill bit, including a trouser body, one end of the trouser body is a working end, and alloy teeth are arranged on the end face of the working end, and the working end is detachably fixedly connected to the alloy teeth.

[0004] The above-mentioned related technical solutions have the following defects: the above-mentioned down-the-hole drill bit can only drill holes with one hole diameter. If it is necessary to continue to expand the drilled hole, the entire drill bit must be replaced, which is relatively troublesome. Utility Model Content

[0005] In order to facilitate the expansion of a drilled hole by a down-the-hole drill, the present application provides a down-the-hole roller drill bit.

[0006] The present application provides a down-the-hole roller drill bit adopts the following technical solution:

[0007] A down-the-hole roller drill bit comprises a drill bit body, wherein a water supply channel is provided in the drill bit body, wherein the water supply channel is divided into a plurality of flow channels toward the front end of the drill bit body and passes through the front end of the drill bit body, wherein a plurality of first alloy teeth are installed on the front end face of the drill bit body, and further comprises a reaming sleeve and a locking assembly, wherein the reaming sleeve is coaxially sleeved on the front end of the drill bit body, wherein a chamfered surface is provided at the front end of the reaming sleeve, wherein a plurality of second alloy teeth are installed on the chamfered surface in a circumferential direction, and wherein the locking assembly locks the reaming sleeve on the drill bit body.

[0008] By adopting the above technical solution, the expansion sleeve is installed on the drill body, which can increase the diameter of the down-the-hole drill without replacing the entire drill bit, and can facilitate the down-the-hole drill to expand the drilled hole.

[0009] Preferably, the locking assembly includes a plurality of protrusions and limiting members, the plurality of protrusions are sequentially arranged on the inner wall of the reaming sleeve along the circumferential direction, a plurality of mounting grooves for the plurality of protrusions to slide into are opened on the outer wall of the drill body along the circumferential direction, and limiting grooves matching the protrusions are opened on the side walls in the same direction of the plurality of mounting grooves, and when the protrusion abuts against the groove wall of the corresponding limiting groove, the limiting member is used to limit the rotation of the reaming sleeve on the drill body.

[0010] By adopting the above technical solution, after the protrusion is aligned with the installation groove and inserted, the reaming sleeve is then rotated so that the protrusion enters the limiting groove and abuts against the wall of the limiting groove, and then the limiting piece is used to limit the rotation of the reaming sleeve on the drill body, so that the reaming sleeve can be completely fixed on the drill body.

[0011] Preferably, the limiting member includes an insert block, a slot is provided on the inner wall of the mounting groove, a plurality of countersunk through slots are provided in sequence along the circumferential direction on the reaming sleeve, the plurality of countersunk through slots respectively correspond to a plurality of insert blocks, the insert block is T-shaped, the insert block is fixed in the corresponding countersunk through slots by bolts, and when the protrusion abuts against the groove wall of the corresponding limiting groove, the end of the insert block is inserted into the corresponding slot, and the insert block abuts against the side wall of the corresponding protrusion.

[0012] Preferably, an anti-backward component is also included, which is used to prevent the insert block from backing out of the slot. The anti-backward component includes a driving member and a movable block. The movable block slides in the drill body along the axial direction of the drill body. The insert block is located at the bottom surface of one end of the slot and is provided with a groove for the end of the movable block to be inserted into the groove. The driving member drives the end of the movable block to be inserted into the groove when water passes through the channel.

[0013] By adopting the above technical solution, since the drill body will rotate and vibrate during use, if the bolts are not tightened, the insert block may become loose. Inserting the movable block into the groove can prevent the insert block from retreating, thereby improving safety.

[0014] Preferably, the driving member includes a plurality of springs and a plurality of moving blocks, a plurality of slide grooves are circumferentially provided on the inner wall of the drill body, the plurality of slide grooves respectively correspond to the plurality of moving blocks, the moving blocks slide in the corresponding slide grooves along a length direction perpendicular to the channel, an end of the moving block away from the plug block and an end of the moving block away from the channel are slidably connected to each other along an inclined direction, an end of the moving block close to the channel is provided with an inclined surface in the direction of water flow, the two ends of the spring are respectively arranged on the moving block and the end wall of the slide groove, when no water flows in the channel, the inclined surface extends to the channel, and the moving block is located outside the groove.

[0015] By adopting the above technical solution, when water flows in the channel, the water impacts the inclined surface, driving the moving block to move toward the slide groove, and the moving block drives the movable block to move toward one side of the groove. Finally, the end of the movable block is inserted into the groove, and the movable block can prevent the inserted block from retreating.

[0016] Preferably, a powder discharge groove communicating with the corresponding flow channel and extending to the front end edge of the drill body is opened on the front end surface of the drill body along the radial direction of the drill body.

[0017] By adopting the above technical solution, the powder discharge groove can smoothly discharge the rock debris generated by drilling, avoiding repeated crushing and extending the service life of the drill bit body.

[0018] Preferably, a plurality of recessed grooves are provided on the outer wall of the drill body along the circumferential direction, the recessed grooves penetrate the drill body along the axial direction of the drill body, the plurality of recessed grooves respectively correspond to a plurality of powder discharge grooves, and the recessed grooves are connected to the corresponding powder discharge grooves near the front end of the drill body.

[0019] By adopting the above technical solution, part of the discharged rock debris can continue to be discharged along the depressed groove.

[0020] The technical effects of this utility model are mainly reflected in the following aspects:

[0021] 1. The utility model installs the hole expansion sleeve on the drill bit body, which can increase the diameter of the down-the-hole drill without replacing the entire drill bit, and can facilitate the down-the-hole drill to expand the drilled hole;

[0022] 2. In the utility model, since the drill body rotates and vibrates during use, if the bolts are not tightened, the insert block may become loose. Inserting the movable block into the groove can prevent the insert block from retreating, thereby improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure after the expansion sleeve of the embodiment of the present application is installed.

[0024] Figure 2 It is a schematic diagram of the assembly of the reaming sleeve and the drill body according to the embodiment of the present application.

[0025] Figure 3 is along Figure 1 Section view along line AA.

[0026] Figure 4 yes Figure 3 Enlarged view of point B in the middle.

[0027] Explanation of the reference numerals: 1. drill body; 11. channel; 12. flow channel; 13. first groove; 14. first alloy tooth; 15. powder discharge groove; 16. recessed groove; 17. slide groove; 18. mounting groove; 19. limit groove; 10. slot; 2. expansion sleeve; 21. chamfered surface; 22. second alloy tooth; 23. countersunk through groove; 3. locking assembly; 31. protrusion; 32. insert block; 321. groove; 4. anti-retraction assembly; 41. spring; 42. moving block; 421. inclined surface; 43. movable block. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1-4 The present application is further described in detail to make the technical solution of the present application easier to understand and grasp.

[0029] The embodiment of the present application discloses a down-the-hole roller drill bit.

[0030] Reference Figure 1 and Figure 2 A down-the-hole roller drill bit of the present embodiment includes a drill body 1, in which a water supply channel 11 is opened. The channel 11 is divided into a plurality of flow channels 12 toward the front end of the drill body 1 and passes through the front end of the drill body 1. A plurality of first alloy teeth 14 are installed on the front end face of the drill body 1.

[0031] Reference Figure 1 and Figure 2 A powder discharge groove 15 is provided on the front end surface of the drill body 1 along the radial direction of the drill body 1, which is connected to the corresponding flow channel 12 and extends to the front edge of the drill body 1. The powder discharge groove 15 can smoothly discharge the rock debris generated by drilling, avoid repeated crushing, and extend the service life of the drill body 1.

[0032] Reference Figure 1 and Figure 2 A plurality of recessed grooves 16 are provided on the outer wall of the drill body 1 along the circumferential direction. The recessed grooves 16 penetrate the drill body 1 along the axial direction of the drill body 1. The plurality of recessed grooves 16 correspond to the plurality of powder discharge grooves 15 respectively. The recessed grooves 16 near the front end of the drill body 1 are connected to the corresponding powder discharge grooves 15. Part of the discharged rock debris can continue to be discharged along the recessed grooves 16.

[0033] Reference Figure 1-Figure 3 The down-the-hole roller drill bit also includes a reaming sleeve 2 and a locking assembly 3. The reaming sleeve 2 is coaxially sleeved on the front end of the drill body 1. The front end of the reaming sleeve 2 is provided with a chamfered surface 21, and a plurality of second alloy teeth 22 are installed on the chamfered surface 21 along the circumferential direction. The locking assembly 3 locks the reaming sleeve 2 on the drill body 1. Installing the reaming sleeve 2 on the drill body 1 can increase the diameter of the down-the-hole drill without replacing the entire drill bit, and can facilitate the down-the-hole drill to expand the drilled hole.

[0034] Reference Figure 1-Figure 3 The locking assembly 3 includes a plurality of protrusions 31 and a limiting member. The plurality of protrusions 31 are sequentially arranged on the inner wall of the reaming sleeve 2 along the circumferential direction. A plurality of mounting grooves 18 for the plurality of protrusions 31 to slide into are opened on the outer wall of the drill body 1 along the circumferential direction. A limiting groove 19 matching with the protrusion 31 is opened on the side wall in the same direction as the plurality of mounting grooves 18. When the protrusion 31 abuts against the groove wall of the corresponding limiting groove 19, the limiting member is used to limit the rotation of the reaming sleeve 2 on the drill body 1.

[0035] Reference Figure 1-Figure 3 After the protrusion 31 is aligned with the mounting groove 18 and inserted, the reaming sleeve 2 is rotated so that the protrusion 31 enters the limiting groove 19 and abuts against the groove wall of the limiting groove 19, and then the limiting piece is used to limit the rotation of the reaming sleeve 2 on the drill body 1, so that the reaming sleeve 2 can be completely fixed on the drill body 1.

[0036] Reference Figure 1-Figure 3 The limiting member includes an insert block 32, a slot 10 is provided on the inner wall of the mounting groove 18, a plurality of countersunk through grooves 23 are provided in sequence along the circumferential direction on the reaming sleeve 2, the plurality of countersunk through grooves 23 respectively correspond to a plurality of insert blocks 32, the insert block 32 is arranged in a T-shape, and the insert block 32 is fixed in the corresponding countersunk through grooves 23 by bolts. When the protrusion 31 abuts against the groove wall of the corresponding limiting groove 19, the end of the insert block 32 is inserted into the corresponding slot 10, and the insert block 32 abuts against the side wall of the corresponding protrusion 31.

[0037] Reference Figure 3 and Figure 4 , and also includes an anti-retraction component 4, which is used to prevent the insert block 32 from withdrawing from the slot 10. The anti-retraction component 4 includes a driving member and a movable block 43. The movable block 43 slides in the drill body 1 along the axial direction of the drill body 1. The insert block 32 is located on the bottom surface of one end of the slot 10 and is provided with a groove 321 for the end of the movable block 43 to be inserted. When water passes through the channel 11, the driving member drives the end of the movable block 43 to be inserted into the groove 321.

[0038] Reference Figure 3 and Figure 4 Since the drill body 1 rotates and vibrates during use, if the bolts are not tightened, the insert block 32 may become loose. Inserting the movable block 43 into the groove 321 can prevent the insert block 32 from retreating, thereby improving safety.

[0039] Reference Figure 3 and Figure 4The driving member includes a plurality of springs 41 and a plurality of moving blocks 42. A plurality of slide grooves 17 are circumferentially provided on the inner wall of the drill body 1. The plurality of slide grooves 17 correspond to the plurality of moving blocks 42 respectively. The moving blocks 42 slide in the corresponding slide grooves 17 along the length direction perpendicular to the channel 11. The end of the movable block 43 away from the plug block 32 and the end of the movable block 42 away from the channel 11 are slidably connected to each other along the inclined direction. An inclined surface 421 in the direction of water flow is provided at the end of the movable block 42 close to the channel 11. The two ends of the spring 41 are respectively arranged on the moving block 42 and the end wall of the slide groove 17. When no water flows in the channel 11, the inclined surface 421 extends to the channel 11, and the movable block 43 is located outside the groove 321.

[0040] Reference Figure 3 and Figure 4 When water flows through the channel 11, the water impacts the inclined surface 421, driving the moving block 42 to move toward the slide groove 17, and the moving block 42 drives the movable block 43 to move toward the side of the groove 321. Finally, the end of the movable block 43 is inserted into the groove 321, and the movable block 43 can prevent the insertion block 32 from retreating.

[0041] Reference Figure 2 and Figure 3 The first alloy tooth 14 and the second alloy tooth 22 are installed in the same manner, that is, a first groove 13 is opened on the drill body 1 or the chamfered surface 21, and then a hammer or a pressing machine is used to assemble the cylindrical end of the alloy tooth into the first groove 13.

[0042] Of course, the above are only typical examples of the present application. In addition, the present application may have many other specific implementation methods. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present application.

Claims

1. A down-the-hole roller drill bit, comprising a drill bit body (1), wherein a channel (11) for water circulation is provided in the drill bit body (1), wherein the channel (11) is divided into a plurality of flow channels (12) toward the front end of the drill bit body (1) and penetrates the front end of the drill bit body (1), and a plurality of first alloy teeth (14) are installed on the front end surface of the drill bit body (1), characterized in that: The invention also comprises a reaming sleeve (2) and a locking assembly (3), wherein the reaming sleeve (2) is coaxially sleeved on the front end of the drill body (1), the front end of the reaming sleeve (2) is provided with a chamfered surface (21), a plurality of second alloy teeth (22) are mounted on the chamfered surface (21) along the circumferential direction, and the locking assembly (3) locks the reaming sleeve (2) on the drill body (1).

2. A down-the-hole roller drill bit according to claim 1, characterized in that: The locking assembly (3) comprises a plurality of protrusions (31) and a limiting member, wherein the plurality of protrusions (31) are sequentially arranged on the inner wall of the reaming sleeve (2) along the circumferential direction, and the outer wall of the drill bit body (1) is provided with a plurality of mounting grooves (18) along the circumferential direction for the plurality of protrusions (31) to slide into, and a limiting groove (19) matching the protrusion (31) is provided on a side wall in the same direction as the plurality of mounting grooves (18). When the protrusion (31) abuts against the groove wall of the corresponding limiting groove (19), the limiting member is used to limit the rotation of the reaming sleeve (2) on the drill bit body (1).

3. A down-the-hole roller drill bit according to claim 2, characterized in that: The limiting component comprises an insert block (32), a slot (10) is provided on the inner wall of the installation groove (18), a plurality of countersunk through grooves (23) are sequentially provided on the reaming sleeve (2) along the circumferential direction, the plurality of countersunk through grooves (23) respectively correspond to a plurality of insert blocks (32), the insert block (32) is arranged in a T-shape, the insert block (32) is fixed in the corresponding countersunk through groove (23) by bolts, and when the protrusion (31) abuts against the groove wall of the corresponding limiting groove (19), the end of the insert block (32) is inserted into the corresponding slot (10), and the insert block (32) abuts against the side wall of the corresponding protrusion (31).

4. A down-the-hole roller drill bit according to claim 3, characterized in that: The drill bit (10) further comprises an anti-retraction assembly (4), the anti-retraction assembly (4) being used to prevent the insert block (32) from withdrawing from the slot (10), the anti-retraction assembly (4) comprising a driving member and a movable block (43), the movable block (43) sliding in the drill bit body (1) along the axial direction of the drill bit body (1), a groove (321) for inserting the end of the movable block (43) is provided on the bottom surface of one end of the insert block (32) located in the slot (10), and the driving member drives the end of the movable block (43) to insert into the groove (321) when water flows through the channel (11).

5. A down-the-hole roller drill bit according to claim 4, characterized in that: The driving member comprises a plurality of springs (41) and a plurality of moving blocks (42). A plurality of sliding grooves (17) are provided on the inner wall of the drill bit body (1) in a circumferential direction. The plurality of sliding grooves (17) correspond to the plurality of moving blocks (42) respectively. The moving blocks (42) slide in the corresponding sliding grooves (17) along a length direction perpendicular to the channel (11). An end of the moving block (43) away from the plug block (32) and an end of the moving block (42) away from the channel (11) are slidably connected to each other along an inclined direction. An end of the moving block (42) close to the channel (11) is provided with an inclined surface (421) in the direction of water flow. The two ends of the spring (41) are respectively arranged on the moving block (42) and on the end wall of the sliding groove (17). When no water flows in the channel (11), the inclined surface (421) extends to the channel (11). The moving block (43) is located outside the groove (321).

6. A down-the-hole roller drill bit according to claim 1, characterized in that: A powder discharge groove (15) is provided on the front end surface of the drill body (1) along the radial direction of the drill body (1), the groove being in communication with the corresponding flow channel (12) and extending to the front end edge of the drill body (1).

7. A down-the-hole roller drill bit according to claim 6, characterized in that: A plurality of recessed grooves (16) are provided on the outer wall of the drill body (1) along the circumferential direction. The recessed grooves (16) penetrate the drill body (1) along the axial direction of the drill body (1). The plurality of recessed grooves (16) respectively correspond to the plurality of powder discharge grooves (15). The recessed grooves (16) are connected to the corresponding powder discharge grooves (15) near the front end of the drill body (1).

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