Gauge protection down-the-hole drill bit

Abstract

The utility model belongs to the field of drill bits characterized by wear-resistant components, and particularly relates to a gauge protection down-the-hole drill bit. The gauge protection down-the-hole drill bit comprises a down-the-hole drill bit base body and a slag discharging groove formed in the periphery of the down-the-hole drill bit base body, the slag discharging groove comprises two groove side walls and a groove bottom wall connected between the two groove side walls, and the ends, away from the groove bottom wall, of the two groove side walls are connected with the peripheral face of the down-the-hole drill bit base body. Mounting grooves are formed in the two groove side walls of the slag discharging groove correspondingly, wear-resisting parts are fixedly arranged in the mounting grooves correspondingly, and the wear-resisting parts protrude out of the surfaces of the groove side walls where the wear-resisting parts are located or are flush with the surfaces of the groove side walls where the wear-resisting parts are located. When slag is discharged, slag stones can be in contact friction with the wear-resistant part, so that abrasion to the side wall of the slag discharging groove is reduced, the wear resistance of the side wall of the slag discharging groove is improved, the influence on the peripheral face of the down-the-hole drill bit base body is reduced, the influence on the strength of the down-the-hole drill bit base body is reduced, and the service life of the down-the-hole drill bit is prolonged.

Description

Technical Field

[0001] The utility model relates to a diameter-guaranteed down-the-hole drill bit, belonging to the field of drill bits characterized by wear-resistant components. Background Art

[0002] When a down-the-hole drill is drilling, the down-the-hole drill bit, as a direct component of drilling, crushes and cuts the strata or rocks through impact to achieve drilling. During the drilling process, the column tooth head of the down-the-hole drill bit is used to cut the strata or rocks, the outer peripheral surface of the base of the down-the-hole drill bit contacts the hole wall of the drill hole, and the slag discharge groove is used to collect and guide the slag to the outside of the hole. However, the slag produced by drilling will also act on the down-the-hole drill bit to cause it to wear. The wear of the column tooth head, the outer peripheral surface of the base of the down-the-hole drill bit and the base slag discharge groove is usually the most serious. Any serious wear will cause the down-the-hole drill bit to continue to be used.

[0003] In the prior art, there are many ways to improve the wear resistance of the outer peripheral surface of column teeth and down-the-hole drill bit base, such as a wear-resistant composite tooth down-the-hole drill bit body disclosed in the Chinese utility model patent with authorization announcement number CN208486837U and authorization announcement date 2019.02.12. The wear-resistant composite tooth down-the-hole drill bit body (i.e., down-the-hole drill bit) includes a down-the-hole drill bit body (i.e., down-the-hole drill bit base), and the outer edge of the down-the-hole drill bit body is equidistantly provided with eight streamlined chip grooves (i.e., slag grooves) and eight composite tooth mounting holes, and the top is provided with two blowing holes and seven composite tooth mounting holes. Among them, the composite tooth mounting holes are used to install composite teeth (i.e., column teeth), and the composite teeth are made of highly wear-resistant materials to improve wear resistance. The wear-resistant composite tooth down-the-hole drill bit body is carburized heat treated to improve surface wear resistance, thereby extending the service life of the down-the-hole drill bit. The DTH drill bit body is also provided with a groove, which is located 5mm below the tooth skirt of the DTH drill bit body, and is 15mm wide and 2mm deep. Cemented carbide powder is evenly welded in the groove, and a cemented carbide powder welded body is formed in the groove through a carburizing heat treatment process, which effectively improves the wear resistance of the outer peripheral surface of the DTH drill bit base. Thus, the DTH drill bit body and the composite teeth are worn synchronously, avoiding the DTH drill bit being unusable due to severe wear of the DTH drill bit body while the composite teeth are intact, and extending the service life of the DTH drill bit.

[0004] The wear resistance of the column teeth and the outer peripheral surface of the DTH drill bit base body in the above scheme has been improved, but the wear resistance of the slag discharge groove has not been strengthened, and the wear resistance of the slag discharge groove is relatively weak. The groove wall of the slag discharge groove of the DTH drill bit includes two opposite groove side walls and a groove bottom wall connected between the two groove side walls, and the ends of the two groove side walls away from the groove bottom wall are connected to the outer peripheral surface of the DTH drill bit base body. When the groove bottom wall is worn, the groove depth of the slag discharge groove will become larger and more conducive to slag discharge. However, when the two groove side walls of the slag discharge groove are severely worn, the groove width will become larger, resulting in a reduction in the area of ​​the outer peripheral surface of the DTH drill bit base body, thereby causing the strength of the DTH drill bit to decrease, affecting the service life of the DTH drill bit. At the same time, when the column tooth hole set on the outer edge of the front end face of the DTH drill bit is worn, the corresponding side teeth will move or even break and fall off, and then the upper and lower apertures of the drill hole cannot be guaranteed to be consistent, affecting the blasting effect. Therefore, it is necessary to improve the wear resistance of the two opposite groove side walls in the slag discharge groove to increase the service life of the down-the-hole drill bit. Utility Model Content

[0005] The utility model aims to provide a diameter-guaranteed down-the-hole drill bit to solve the problem that the wear resistance of the groove side walls on both sides of the existing down-the-hole drill bit slag discharge groove is poor, so that when severely worn, the area of ​​the outer peripheral surface of the down-the-hole drill bit base body is reduced, resulting in a decrease in the strength of the down-the-hole drill bit and affecting the service life.

[0006] In order to achieve the above purpose, the diameter-guaranteed down-the-hole drill bit in the utility model adopts the following technical solutions:

[0007] A diameter-guaranteed down-the-hole drill bit comprises a down-the-hole drill bit base and a slag discharge groove arranged on the outer periphery of the down-the-hole drill bit base, the slag discharge groove comprises two groove side walls and a groove bottom wall connected between the two groove side walls, one end of the two groove side walls away from the groove bottom wall is respectively connected to the outer peripheral surface of the down-the-hole drill bit base, and mounting grooves are respectively arranged on the two groove side walls of the slag discharge groove, and wear-resistant parts are fixedly arranged in each mounting groove, and the wear-resistant parts protrude from the surface of the groove side wall or are flush with the surface of the groove side wall.

[0008] The beneficial effect of the above technical solution is that: the utility model belongs to an improved invention, and mounting grooves are arranged on the side walls of the slag discharge groove, and wear-resistant parts are arranged in the mounting grooves, and the wear-resistant parts protrude from the surface of the side walls of the grooves or are flush with the surface of the side walls of the grooves. When slag is discharged through the slag discharge groove, the slag stone will directly contact and rub against the wear-resistant parts, thereby reducing the wear on the side walls of the slag discharge groove, effectively improving the wear resistance of the slag discharge groove, slowing down the wear speed of the side walls of the slag discharge groove, and then slowing down the speed at which the groove width increases, effectively reducing the influence of the down-the-hole drill bit on the outer peripheral surface area of ​​the down-the-hole drill bit base during its service life, reducing the influence on the strength of the down-the-hole drill bit, and improving the service life of the down-the-hole drill bit.

[0009] Furthermore, the wear-resistant parts are arranged as wear-resistant column teeth, the mounting grooves are cylindrical blind holes, and at least one row of mounting grooves on the side walls of each groove is arranged to install at least one row of wear-resistant parts. Each row has at least two mounting grooves and are arranged at intervals along the length direction of the slag discharge groove.

[0010] Furthermore, the wear-resistant column tooth has a spherical wear-resistant head, and the spherical wear-resistant head protrudes from the surface of the side wall of the groove.

[0011] Furthermore, the inner diameter of the blind hole is smaller than the outer diameter of the corresponding wear-resistant column tooth, and the wear-resistant column tooth is interference-fitted in the corresponding blind hole.

[0012] Furthermore, the wear-resistant parts are configured as wear-resistant alloy sheets, and each groove side wall is provided with an installation groove for installing the corresponding wear-resistant alloy sheet, the installation groove includes a first groove wall and a second groove wall connected at an angle, one end of the first groove wall is connected to the outer peripheral surface of the down-the-hole drill bit base body, the second groove wall is located at the end of the first groove wall away from the outer peripheral surface of the down-the-hole drill bit base body, the end of the second groove wall away from the first groove wall is connected to the groove side wall, the side surface of the wear-resistant alloy sheet facing the slag discharge groove is flush with the surface of the groove side wall, the side surface of the wear-resistant alloy sheet facing away from the slag discharge groove is in contact with the first groove wall, and the side surface of the wear-resistant alloy sheet away from the outer peripheral surface of the down-the-hole drill bit base is in contact with the second groove wall.

[0013] Furthermore, one end of the wear-resistant alloy sheet away from the bottom wall of the slag discharge groove is flush with the outer peripheral surface of the down-the-hole drill bit base, and the front end surface of the wear-resistant alloy sheet is flush with the front end surface of the down-the-hole drill bit base provided with the end face column teeth.

[0014] Furthermore, the mounting groove further includes a third groove wall connected to both the first groove wall and the second groove wall, and the third groove wall contacts the rear end surface of the wear-resistant alloy sheet.

[0015] Furthermore, the length of the wear-resistant alloy sheet is shorter than the length of the slag discharge trough.

[0016] Furthermore, each wear-resistant alloy sheet is fixed in the installation groove by at least two alloy nails penetrating the wear-resistant alloy sheet, the alloy nail includes a head and a rod portion with a diameter smaller than the head, the head of each alloy nail is press-fitted with the surface of the corresponding wear-resistant alloy sheet, a blind hole is provided on the first groove wall of the installation groove, the rod portion of the alloy nail passes through the wear-resistant alloy sheet and is interference-fitted with the blind hole.

[0017] Furthermore, each wear-resistant alloy sheet is fixed in the corresponding installation groove by welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front view of the embodiment 1 of the diameter-guaranteed down-the-hole drill bit of the utility model;

[0019] Figure 2 It is a structural schematic diagram of Embodiment 1 of the diameter-guaranteed down-the-hole drill bit of the utility model;

[0020] Figure 3 It is a side view of the embodiment 1 of the diameter-guaranteed down-the-hole drill bit of the utility model;

[0021] Figure 4 It is a front view of the embodiment 2 of the diameter-guaranteed down-the-hole drill bit of the utility model;

[0022] Figure 5 It is a structural schematic diagram of Embodiment 2 of the diameter-guaranteed down-the-hole drill bit of the utility model;

[0023] Figure 6 for Figure 5 A schematic diagram of the structure after a wear-resistant alloy sheet is removed from a slag discharge trough;

[0024] Figure 7 It is a front view of the embodiment 3 of the diameter-guaranteed down-the-hole drill bit of the utility model;

[0025] Figure 8 It is a structural schematic diagram of Example 3 of the diameter-maintaining down-the-hole drill bit of the utility model.

[0026] In the figure: 1, down-the-hole drill bit base; 2, slag discharge groove; 21, groove side wall; 3, wear-resistant column teeth; 31, spherical wear-resistant head; 4, alloy nails; 5, wear-resistant alloy sheet; 6, head; 7, rod; 8, side teeth; 9, mounting groove; 91, first groove wall; 92, second groove wall; 93, third groove wall; 10, gauge teeth. DETAILED DESCRIPTION

[0027] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0028] In response to the technical problems existing in the prior art, the basic technical concept of the utility model is: to fix wear-resistant parts at the side walls of the slag discharge trough so that the slag and the wear-resistant parts rub against each other to reduce the wear on the side walls of the trough, thereby slowing down the wear rate of the side walls of the trough and improving the wear resistance.

[0029] Embodiment 1 of the diameter-guaranteed down-the-hole drill bit in the utility model:

[0030] like Figure 1-3 As shown, the gauge-protected down-the-hole drill bit includes a down-the-hole drill bit base 1, and the down-the-hole drill bit base 1 includes a head 6 and a rod 7. The rod 7 is used to connect the impactor. The front end face of the head 6 is provided with a plurality of end face column teeth for cutting strata or rocks, wherein the end face column teeth located at the outer edge are called side teeth. The outer peripheral surface of the head 6 is provided with gauge-protected teeth 10 to improve the wear resistance of the outer peripheral surface of the head 6. The outer periphery of the head 6 is also provided with a plurality of slag discharge grooves 2. In this embodiment, as shown in FIG. Figure 3 As shown, eight slag discharge grooves 2 are provided and are distributed at equal intervals, and the gauge teeth 10 are respectively located between two adjacent slag discharge grooves 2 .

[0031] like Figure 3 As shown, the structure of the slag discharge groove 2 is a V-shaped groove, and each slag discharge groove 2 includes two groove side walls 21 and a groove bottom wall connected between the two groove side walls 21, wherein the groove side walls 21 are all planes, the groove bottom wall is all arc surface, and the ends of the two groove side walls 21 away from the groove bottom wall are respectively connected to the outer peripheral surface of the head 6. When the down-the-hole drill is drilling, the slag discharge groove 2 can collect and guide the slag generated by cutting and the like to be discharged out of the drill hole.

[0032] The two groove side walls 21 of the slag discharge groove 2 are respectively provided with mounting grooves (not shown in the figure), and wear-resistant parts are fixedly arranged in each mounting groove, and the wear-resistant parts protrude from the surface of the groove side wall 21 or are flush with the surface of the groove side wall 21. In this embodiment, the wear-resistant parts are set as wear-resistant column teeth 8, and the mounting grooves on each groove side wall 21 are cylindrical blind holes, and the inner diameter of the blind hole is set to be smaller than the outer diameter of the corresponding wear-resistant column teeth, so that the wear-resistant column teeth are interference-fitted in the corresponding blind holes to avoid falling off during use and failing to protect the slag discharge groove 2. At least one row of mounting grooves on each groove side wall 21 is provided to install at least one row of wear-resistant parts, and each row has at least two mounting grooves and are arranged at intervals along the groove length direction of the slag discharge groove. In this embodiment, a row of mounting grooves is provided on each groove side wall 21, and each row is provided with three, wherein the frontmost wear-resistant column teeth are close to the front end face of the head 6, so as to improve the wear resistance of the front groove of the slag discharge groove, thereby protecting the tooth holes of the side teeth from being worn and ensuring that the upper and lower hole diameters of the drilled hole are consistent.

[0033] like Figure 3 As shown, the wear-resistant column teeth 3 have spherical wear-resistant heads, and the spherical wear-resistant heads protrude from the surface of the side wall 21 of the groove. In this embodiment, the wear-resistant column teeth 3 are set as carbide ball teeth. Of course, polycrystalline diamond composite sheet teeth can also be used. The height of the carbide ball teeth 3 protruding from the surface of the slag discharge groove 2 is about 1 mm to avoid blocking the slag. When the slag discharge groove 2 collects and guides the slag to move, the slag will directly contact and rub with the spherical wear-resistant heads of the carbide ball teeth 3, reducing the wear caused by the slag to the slag discharge groove 2, thereby improving the wear resistance of the two groove side walls 21 of the slag discharge groove 2, and then slowing down the speed at which the width of the slag discharge groove increases, reducing the impact on the outer peripheral surface of the down-the-hole drill bit base 1, reducing the impact on the strength of the down-the-hole drill bit base 1, and improving the service life of the down-the-hole drill bit.

[0034] Embodiment 2 of the diameter-guaranteed down-the-hole drill bit in the utility model:

[0035] The difference between this embodiment and embodiment 1 is that the shape of the slag discharge trough, the structure of the wear-resistant parts and the installation method are different in this embodiment. Figure 4 and Figure 5As shown, the slag discharge groove 2 in this embodiment is also a V-shaped groove, the difference is that the groove bottom wall is a plane. In addition, the wear-resistant part is also set as a wear-resistant alloy sheet 5, which can be a hard alloy sheet. Since the groove side wall 21 is a plane, the wear-resistant alloy sheet 5 is a sheet-like flat plate structure.

[0036] like Figure 6 As shown, the installation groove 9 in this embodiment includes a first groove wall 91 and a second groove wall 92 connected at an angle, one end of the first groove wall 91 is connected to the outer peripheral surface of the down-the-hole drill bit base 1, the second groove wall is located at the end of the first groove wall 91 away from the outer peripheral surface of the head 6, and the end of the second groove wall 92 away from the first groove wall 91 is connected to the groove side wall 21 where it is located. In this embodiment, the groove length of the installation groove 9 is greater than half of the groove length of the slag discharge groove where it is located. The side of the wear-resistant alloy sheet 5 facing the slag discharge groove 2 is flush with the surface of the groove side wall 21 where it is located, the side of the wear-resistant alloy sheet 5 facing away from the slag discharge groove 2 is in contact with the first groove wall 91, and the side of the wear-resistant alloy sheet 5 away from the outer peripheral surface of the head 6 is in contact with the second groove wall 92. The shape of each cemented carbide sheet 5 is adapted to the shape of the corresponding mounting groove 9. The end of the cemented carbide sheet 5 away from the bottom wall of the slag discharge groove 2 is flush with the outer peripheral surface of the head 6, and the front end surface of the cemented carbide sheet 5 is flush with the front end surface of the head 6, so as to protect the front notch of the slag discharge groove 2, avoid serious wear of the front end of the groove side wall 21, and cause the tooth hole where the adjacent side teeth 8 is located to be worn, resulting in the side teeth moving or even breaking and falling off, and it is impossible to ensure that the upper and lower apertures of the drilled hole are consistent, affecting the blasting effect. At the same time, the cemented carbide sheet 5 does not protrude from the outer peripheral surface of the head 6, which can avoid damaging the aperture of the drilled hole to ensure that the upper and lower apertures of the drilled hole are consistent.

[0037] The installation groove 9 also includes a third groove wall 93 connected to the first groove wall 91 and the second groove wall 92. The third groove wall 93 contacts the rear end surface of the cemented carbide sheet 5 to provide positioning for the cemented carbide sheet 5 during installation. The length of the cemented carbide sheet 5 is shorter than the groove length of the slag discharge groove 2 in which it is located to reduce production costs.

[0038] Each wear-resistant alloy sheet 5 is fixed in the installation groove 9 by at least two alloy nails 4 penetrating the hard alloy sheet 5. In this embodiment, each hard alloy sheet 5 is fixed in the installation groove 9 by two alloy nails 4 penetrating the hard alloy sheet 5. The alloy nail 4 includes a head and a rod with a diameter smaller than the head. The head of each alloy nail 4 is pressed against the surface of the corresponding hard alloy sheet 5. A blind hole is provided on the second groove wall 92 of the installation groove 9. The rod of the alloy nail passes through the wear-resistant alloy sheet and is interference fit with the blind hole to ensure the firm position of each hard alloy sheet 5 to avoid falling off during use and failing to protect the slag discharge groove 2. The thickness of the head of the alloy nail 4 is about 1 mm to avoid affecting the slag discharge effect of the slag discharge groove 2. When the slag discharge groove 2 is discharging slag, the slag stone will directly contact and rub against the hard alloy sheet 5 and the alloy nail 4, reducing the wear on the two groove side walls 21 of the slag discharge groove 2, thereby slowing down the speed at which the groove width increases, effectively reducing the impact of the down-the-hole drill bit on the outer peripheral surface area of ​​the down-the-hole drill bit base during its service life, reducing the impact on the strength of the down-the-hole drill bit, and increasing the service life of the down-the-hole drill bit. At the same time, the wear-resistant alloy sheet 5 can also protect the front notch of the slag discharge groove 2, preventing the front notch from wearing and widening, thereby affecting the adjacent side teeth, causing the side teeth to move or even break and fall off, resulting in inconsistent upper and lower apertures of the drilled hole and affecting the blasting effect.

[0039] Embodiment 3 of the diameter-guaranteed down-the-hole drill bit in the utility model:

[0040] The difference between this embodiment and embodiment 2 is that the shape of the slag discharge groove, the shape of the wear-resistant alloy sheet 5 and the fixing method are different in this embodiment. Figure 7 and Figure 8 As shown, the slag discharge groove 2 in this embodiment is an arc-shaped groove, and the two groove side walls 21 of the slag discharge groove 2 are also provided with wear-resistant alloy sheets 5. The difference is that the side of the wear-resistant alloy sheet 5 facing the slag discharge groove 2 is an arc surface to ensure that it can be flush with the groove side wall 21 to avoid affecting the slag discharge effect. The groove side wall 21 is also provided with a mounting groove 9, and the difference is that the groove length of the mounting groove 9 is approximately half of the groove length of the slag discharge groove. Each cemented carbide sheet 5 is fixed in the corresponding mounting groove 9 by welding. Therefore, when in use, the cemented carbide sheet 5 can contact with the slag stone, reduce the friction between the slag stone and the two groove side walls 21 of the slag discharge groove 5, effectively improve the wear resistance of the slag discharge groove 5, reduce the impact on the outer peripheral surface of the down-the-hole drill bit base, and increase the service life of the down-the-hole drill bit.

[0041] In other embodiments, the difference from Embodiment 2 is that the number of alloy nails is different. When setting the number of alloy nails, the alloy nails can be set to three, four, five or other numbers greater than two; in other embodiments, the alloy nail can also be set to one.

[0042] In other embodiments, the difference from Embodiment 2 or 3 is that the structure of the mounting groove is different, the third groove wall of the mounting groove may not be set, the length of the mounting groove is the same as the groove length of the slag discharge groove, and the length of the wear-resistant alloy sheet may be the same as the groove length of the slag discharge groove.

[0043] In other embodiments, the difference from Embodiment 2 or 3 is that the arrangement position of the cemented carbide sheet is different, and the front end face of the cemented carbide sheet may slightly protrude from the front end face of the down-the-hole drill bit base, but not exceed the end of the down-the-hole drill bit column tooth to avoid affecting the drilling; in other embodiments, the front end face of the cemented carbide sheet may be slightly rearward of the front end face of the down-the-hole drill bit base; in other embodiments, one end of the cemented carbide sheet away from the bottom wall of the slag discharge groove may be recessed in the outer peripheral surface of the down-the-hole drill bit base, and at this time, the end of the cemented carbide sheet away from the bottom wall of the slag discharge groove is not flush with the outer peripheral surface of the down-the-hole drill bit base.

[0044] In other embodiments, the difference from Embodiment 1 is that the structure of the mounting groove is different. The mounting groove is also a cylindrical blind hole. The difference is that the inner diameter of the blind hole is equal to or slightly larger than the outer diameter of the corresponding wear-resistant column tooth. At this time, the wear-resistant column tooth can be welded and fixed on the side wall of the slag discharge groove.

[0045] In other embodiments, when setting the structure of the wear-resistant column teeth, the spherical wear-resistant head may not be set. In this case, the wear-resistant column teeth can be cylindrical. In this case, the wear-resistant column teeth can be flush with the side wall of the groove, or protrude from the side wall of the groove.

[0046] In other embodiments, when setting the mounting grooves of the wear-resistant column teeth, each row of mounting grooves can be set to two, four, five or other numbers greater than two; in other embodiments, the mounting groove can also be set to one; in other embodiments, according to the specific dimensions of the side walls of the slag discharge groove and the specific dimensions of the wear-resistant column teeth, two rows of mounting grooves can be set on the side walls of each slag discharge groove.

[0047] Finally, it should be noted that the above is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments without creative work, or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A diameter-guaranteed down-the-hole drill bit, comprising a down-the-hole drill bit base body and a slag discharge groove arranged on the outer periphery of the down-the-hole drill bit base body, the slag discharge groove comprising two groove side walls and a groove bottom wall connected between the two groove side walls, one end of the two groove side walls away from the groove bottom wall is respectively connected to the outer peripheral surface of the down-the-hole drill bit base body, characterized in that: The two side walls of the slag discharge trough are respectively provided with mounting grooves, and wear-resistant parts are fixedly arranged in each mounting groove, and the wear-resistant parts protrude from the surface of the side wall of the trough or are flush with the surface of the side wall of the trough.

2. The gauge-guaranteed down-the-hole drill bit according to claim 1, characterized in that: The wear-resistant parts are arranged as wear-resistant column teeth, and the mounting grooves are cylindrical blind holes. There is at least one row of mounting grooves on the side walls of each groove to install at least one row of wear-resistant parts. Each row has at least two mounting grooves and they are arranged at intervals along the length of the slag discharge groove.

3. The gauge-guaranteed down-the-hole drill bit according to claim 2, characterized in that: The wear-resistant column tooth has a spherical wear-resistant head, and the spherical wear-resistant head protrudes from the surface of the side wall of the groove.

4. The gauge-guaranteed down-the-hole drill bit according to claim 2, characterized in that: The inner diameter of the blind hole is smaller than the outer diameter of the corresponding wear-resistant column tooth, and the wear-resistant column tooth is interference-fitted in the corresponding blind hole.

5. The gauge-guaranteed down-the-hole drill bit according to claim 1, characterized in that: The wear-resistant parts are configured as wear-resistant alloy sheets, and each groove side wall is provided with an installation groove for installing the corresponding wear-resistant alloy sheet, the installation groove includes a first groove wall and a second groove wall connected at an angle, one end of the first groove wall is connected to the outer peripheral surface of the down-the-hole drill bit base body, the second groove wall is located at the end of the first groove wall away from the outer peripheral surface of the down-the-hole drill bit base body, the end of the second groove wall away from the first groove wall is connected to the groove side wall, a side surface of the wear-resistant alloy sheet facing the slag discharge groove is flush with the surface of the groove side wall, a side surface of the wear-resistant alloy sheet facing away from the slag discharge groove is in contact with the first groove wall, and a side surface of the wear-resistant alloy sheet away from the outer peripheral surface of the down-the-hole drill bit base is in contact with the second groove wall.

6. The gauge-guaranteed down-the-hole drill bit according to claim 5, characterized in that: One end of the wear-resistant alloy sheet away from the bottom wall of the slag discharge groove is flush with the outer peripheral surface of the down-the-hole drill base, and the front end surface of the wear-resistant alloy sheet is flush with the front end surface of the down-the-hole drill base with end face column teeth.

7. The gauge-guaranteed down-the-hole drill bit according to claim 6, characterized in that: The mounting groove further comprises a third groove wall connected to both the first groove wall and the second groove wall, and the third groove wall contacts the rear end surface of the wear-resistant alloy sheet.

8. The gauge-guaranteed down-the-hole drill bit according to claim 5 or 6, characterized in that: The length of the wear-resistant alloy sheet is smaller than the length of the slag discharge trough.

9. The gauge-guaranteed down-the-hole drill bit according to any one of claims 5 to 7, characterized in that: Each wear-resistant alloy sheet is fixed in the installation groove by at least two alloy nails penetrating the wear-resistant alloy sheet. The alloy nail includes a head and a rod with a diameter smaller than the head. The head of each alloy nail is press-fitted with the surface of the corresponding wear-resistant alloy sheet. A blind hole is provided on the first groove wall of the installation groove. The rod of the alloy nail passes through the wear-resistant alloy sheet and is interference-fitted with the blind hole.

10. The gauge-guaranteed down-the-hole drill bit according to any one of claims 5 to 7, characterized in that: Each wear-resistant alloy sheet is fixed in a corresponding installation groove by welding.

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