Drill bit connecting structure of impactor and down-hole impactor

Abstract

The utility model discloses an impactor drill bit connecting structure and a down-hole impactor. The down-hole impactor comprises an outer sleeve, a drill rod clamping sleeve, a drill bit and a limiting assembly. Wherein the drill clamping sleeve is fixedly connected with the outer sleeve, splines are arranged on the inner wall of the drill clamping sleeve in the circumferential direction at intervals, grooves are formed between the adjacent splines, spline grooves are formed in the outer surface of the drill bit in the circumferential direction at intervals, bosses are formed between the adjacent spline grooves, and the spline grooves are used for being in transmission connection with the splines. The limiting assembly is arranged between the groove and the boss and used for limiting and restraining the axial displacement of the drill bit. According to the impactor drill bit connecting structure and the down-hole impactor, compared with the prior art, a limiting groove does not need to be formed in the drill bit, the strength of the drill bit is higher, the situation that the drill bit is broken is not prone to occurring, and construction safety is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of mining machinery and equipment, and more specifically, to an impactor drill bit connection structure and a down-the-hole impactor. Background Art

[0002] Down-the-hole drills are widely used in blasting drilling operations in metallurgy, coal, building materials, railways, hydropower construction and other engineering projects. Compared with common rock drills, down-the-hole drills have the characteristics of deep drilling, large drilling diameter, high drilling efficiency and wide adaptability. They are currently the most commonly used large-scale rock drilling equipment.

[0003] Down-the-hole hammers are mainly used in drilling operations such as mine blasting and water wells. The air compressor provides high-pressure compressed air to the front and rear chambers of the hammer to perform work, causing the piston to produce high-speed reciprocating motion to hit the tail of the drill bit, and finally the alloy teeth on the drill bit are used to break the rock. The generated rock debris is blown out of the bottom of the hole by the high-pressure gas discharged by the hammer, and finally a hole is formed.

[0004] In the current down-the-hole hammer, the existing drill bit is mainly fixedly connected to the existing outer sleeve by a retaining ring and an existing clamping sleeve, wherein the existing clamping sleeve and the existing outer sleeve are connected by a threaded connection, the outer ring of the retaining ring is fixedly connected to the existing outer sleeve, and a limiting groove is provided on the outer ring of the existing drill bit. The inner ring of the retaining ring cooperates with the limiting groove to ensure that the drill bit can move axially during operation without being detached from the outer sleeve, thereby realizing the normal operation of the down-the-hole hammer.

[0005] However, in the current down-the-hole impactor, the diameter of the limiting groove on the existing drill bit is relatively small. Under the action of the piston impact force, the existing drill bit is easily broken at the position of the limiting groove, causing the existing drill bit to fall to the bottom of the hole, affecting subsequent construction, and even causing the hole to be scrapped.

[0006] Therefore, there is an urgent need for an impact drill bit connection structure and a down-the-hole impactor, which does not require a limiting groove to be set on the drill bit, has higher drill bit strength, is less likely to break, and ensures construction safety. Utility Model Content

[0007] In order to solve the above technical problems, the present application provides an impact drill bit connection structure and a down-the-hole impactor, which does not require a limiting groove to be set on the drill bit. The drill bit is stronger and is less likely to break, thereby ensuring construction safety.

[0008] The technical solutions provided in this application are as follows:

[0009] A hammer drill bit connection structure includes an outer sleeve, a drill sleeve, a drill bit and a limit assembly;

[0010] In which, the drill sleeve is fixedly connected to the outer sleeve, the inner wall of the drill sleeve is provided with splines at circumferential intervals, and grooves are formed between adjacent splines, the outer surface of the drill bit is provided with spline grooves at circumferential intervals, and bosses are formed between adjacent spline grooves, the spline grooves are used for transmission connection with the splines, and the limiting assembly is provided between the grooves and the bosses to limit and constrain the axial displacement of the drill bit.

[0011] Preferably, at least two groups of the limiting components are provided and are spaced apart circumferentially around the drill bit.

[0012] Preferably, the limiting component includes:

[0013] a mounting hole provided on the groove;

[0014] A limiting groove is provided on the boss, and the limiting groove extends along the axial direction of the drill bit;

[0015] A positioning member detachably connected to the mounting hole is used in conjunction with the limiting groove to limit and constrain the axial displacement of the drill bit.

[0016] Preferably, the length of the limiting groove is smaller than the length of the boss.

[0017] Preferably, the clamp sleeve comprises a connecting section, a transition section and a positioning section which are sequentially connected axially;

[0018] The connecting section is connected to the outer sleeve by a threaded connection, the outer diameter of the positioning section is larger than the outer diameters of the connecting section and the transition section, the rear end of the positioning section abuts against the front end of the outer sleeve, and the mounting hole is provided on the transition section.

[0019] Preferably, the positioning member includes a mounting portion and a positioning portion connected in sequence, the cross-sectional shape of the mounting portion is adapted to the cross-sectional shape of the mounting hole, and the positioning portion is specifically spherical.

[0020] Preferably, the mounting hole is a circular hole.

[0021] A down-the-hole hammer comprises the hammer drill bit connection structure described in any one of the above items.

[0022] The present invention provides an impact drill bit connection structure. First, it is provided with an outer sleeve, a drill sleeve, a drill bit, and a limit assembly. The drill sleeve is fixedly connected to the outer sleeve. The inner wall of the drill sleeve is axially provided with splines, and grooves are formed between adjacent splines. The outer surface of the drill bit is circumferentially provided with spline grooves, and bosses are formed between adjacent spline grooves. The spline grooves are used for transmission connection with the splines. The limit assembly is provided between the grooves and the bosses to limit and constrain the axial displacement of the drill bit. The outer ring of the retaining ring in the prior art is fixedly connected to the outer cylinder. In order to limit the axial position of the drill bit, a limit groove needs to be provided on the drill bit, and the retaining ring cooperates with the limit groove. On the one hand, the limit groove on the drill bit reduces the strength of the drill bit, making it easy to break under the impact of the piston. On the other hand, because the retaining ring is provided on the outer cylinder and the limit groove is provided axially on the drill bit, the length of the outer cylinder and the drill bit is increased, thereby increasing the manufacturing cost. The hammer drill bit connection structure provided by the present invention has a limit assembly disposed between the groove of the drill sleeve and the boss of the drill bit, eliminating the need for an additional limit groove and thus not affecting the strength of the drill bit, thereby ensuring construction safety. Furthermore, the length of the outer cylinder and the drill bit is shorter, resulting in lower manufacturing costs. Thus, compared to the prior art, the hammer drill bit connection structure in the embodiment of the present invention does not require a limit groove on the drill bit, resulting in a higher drill bit strength and less risk of drill bit breakage, thereby ensuring construction safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0024] Figure 1 A schematic diagram of a structural connection structure of an impact drill bit in the prior art;

[0025] Figure 2 A schematic diagram of the structure of the hammer drill bit connection structure provided by the utility model;

[0026] Figure 3 A schematic structural diagram of a clamp sleeve provided in an embodiment of the present utility model;

[0027] Figure 4 A structural schematic diagram of a drill bit provided in an embodiment of the utility model;

[0028] Figure 5 A structural schematic diagram of a positioning member provided in an embodiment of the utility model.

[0029] Reference numerals:

[0030] Existing technology: 01. Existing outer sleeve; 02. Existing drill sleeve; 03. Existing drill bit; 04. Snap ring; 05. Limiting groove; 06. Piston;

[0031] This application: 1. Outer sleeve; 2. Drill sleeve; 3. Drill bit; 51. Spline; 52. Groove; 61. Spline groove; 62. Boss; 41. Mounting hole; 42. Limiting groove; 43. Positioning piece; 21. Connecting section; 22. Transition section; 23. Positioning section. DETAILED DESCRIPTION

[0032] In order to help those skilled in the art better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of this application.

[0033] It should be noted that when an element is referred to as being “fixed on” or “set on” another element, it can be directly on the other element or indirectly set on the other element; when an element is referred to as being “connected to” another element, it can be directly connected to the other element or indirectly connected to the other element.

[0034] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout the description of this application, "plurality" or "several" means two or more, unless otherwise specifically defined.

[0036] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the efficacy and purpose that can be achieved by this application.

[0037] The embodiments of the present invention are written in a progressive manner.

[0038] like Figures 2 to 5 As shown, an embodiment of the utility model provides an impact drill bit connection structure, including an outer sleeve 1, a drill sleeve 2, a drill bit 3 and a limiting assembly; wherein, the drill sleeve 2 is fixedly connected to the outer sleeve 1, the inner wall of the drill sleeve 2 is circumferentially spaced with splines 51, and grooves 52 are formed between adjacent splines 51, and the outer surface of the drill bit 3 is circumferentially spaced with spline grooves 61, and bosses 62 are formed between adjacent spline grooves 61, and the spline grooves 61 are used for transmission connection with the splines 51, and the limiting assembly is arranged between the grooves 52 and the bosses 62, and is used to limit and constrain the axial displacement of the drill bit 3.

[0039] Among the current down-the-hole impactors, Figure 1 As shown, the existing drill bit 03 is mainly fixedly connected to the existing outer sleeve 01 by the retaining ring 04 and the existing drill sleeve 02, wherein the existing drill sleeve 02 and the existing outer sleeve 01 are connected by a threaded connection, the outer ring of the retaining ring 04 is fixedly connected to the existing outer sleeve 01, and a limiting groove 05 is provided on the outer ring of the existing drill bit 03. The inner ring of the retaining ring 04 cooperates with the limiting groove 05 to ensure that the existing drill bit 03 can move axially during operation without being detached from the existing outer sleeve 01, thereby realizing the normal operation of the down-the-hole impactor.

[0040] However, in the current down-the-hole impactor, the diameter of the limiting groove 05 on the existing drill bit 03 is relatively small. Under the impact force of the piston 06, the limiting groove 05 of the existing drill bit 03 is easily broken, causing the existing drill bit 03 to fall to the bottom of the hole, affecting subsequent construction, and even causing the hole to be scrapped.

[0041] The hammer drill bit connection structure provided by the utility model comprises an outer sleeve 1, a drill sleeve 2, a drill bit 3 and a limiting assembly, wherein the drill sleeve 2 is fixedly connected to the outer sleeve 1, the inner wall of the drill sleeve 2 is axially provided with splines 51, grooves 52 are formed between adjacent splines 51, the outer surface of the drill bit 3 is circumferentially spaced apart with spline grooves 61, bosses 62 are formed between adjacent spline grooves 61, the spline grooves 61 are used for transmission connection with the splines 51, and the limiting assembly is provided between the grooves 52 and the bosses 62 for limiting and restraining the axial displacement of the drill bit 3. The outer ring of the retaining ring in the prior art is fixedly connected to the outer cylinder. In order to limit the axial position of the drill bit 3, a limiting groove needs to be provided on the drill bit 3, and the retaining ring cooperates with the limiting groove. On the one hand, the drill bit 3 has a limited groove, which reduces its strength and makes it prone to breakage under the impact of the piston. On the other hand, the retaining ring is provided on the outer cylinder, and the retaining groove is provided in the axial direction of the drill bit 3, which makes the length of the outer cylinder and the length of the drill bit 3 longer, thereby increasing the manufacturing cost. In the hammer drill bit 3 connection structure provided by the present invention, the limiting assembly is provided between the groove 52 of the clamping sleeve 2 and the boss 62 of the drill bit 3. There is no need to provide an additional limiting groove, which will not affect the strength of the drill bit 3, thereby ensuring construction safety. In addition, the length of the outer cylinder and the drill bit 3 is shorter, and the manufacturing cost is lower. It can be seen that compared with the prior art, the hammer drill bit connection structure in the embodiment of the present invention does not need to provide a limiting groove on the drill bit, the drill bit is stronger, and it is not prone to drill bit breakage, thereby ensuring construction safety and lowering the manufacturing cost.

[0042] In the above structure, in order to improve the reliability of the limiting component's axial limiting effect on the drill bit, as one of the implementation methods, the limiting component in the embodiment of the utility model is provided with at least two groups, and the two groups of limiting components are arranged at circumferential intervals around the drill bit 3.

[0043] In the above structure, as one of the preferred embodiments, the limiting assembly in the embodiment of the utility model includes a mounting hole 41, a limiting groove 42 and a positioning member 43, wherein the mounting hole 41 is arranged on the groove 52, the limiting groove 42 is arranged on the boss 62, the limiting groove 42 extends along the axial direction of the drill bit 3, the positioning member 43 passes through the mounting hole 41 and the positioning member 43 is detachably connected to the mounting hole 41, and the positioning member 43 is used in conjunction with the limiting groove 42 to limit and constrain the axial displacement of the drill bit 3.

[0044] Furthermore, the distal end of the positioning member 43 extends into the limiting groove 42 and is slidably connected thereto. When the drill bit 3 moves to its lowest point along the axial direction, the distal end of the positioning member 43 abuts the first end of the limiting groove 42, preventing the drill bit 3 from further downward movement. When the drill bit 3 moves to its highest point along the axial direction, the distal end of the positioning member 43 abuts the second end of the limiting groove 42, preventing the drill bit 3 from further upward movement. This limits and constrains the axial displacement of the drill bit 3.

[0045] Furthermore, as one implementation method, the length of the limiting groove 42 in the embodiment of the present invention is smaller than the length of the boss 62 .

[0046] In the above structure, as one of the embodiments, the clamp sleeve 2 in the embodiment of the utility model includes a connecting section 21, a transition section 22 and a positioning section 23 which are axially connected in sequence, wherein the connecting section 21 is connected to the outer sleeve 1 by a thread, the outer diameter of the positioning section 23 is larger than the outer diameters of the connecting section 21 and the transition section 22, the rear end of the positioning section 23 abuts against the front end surface of the outer sleeve 1 to realize the axial positioning of the clamp sleeve 2, the transition section 22 is arranged between the connecting section 21 and the positioning section 23, the mounting hole 41 is arranged on the transition section 22, and the mounting hole 41 is used to cooperate with the positioning piece 43.

[0047] In the above structure, as one of the implementation modes, the positioning member 43 in the embodiment of the utility model includes a mounting portion and a positioning portion connected in sequence, the cross-sectional shape of the mounting portion is adapted to the cross-sectional shape of the mounting hole 41, and the end of the positioning portion is specifically a spherical structure.

[0048] In the above structure, as one specific implementation, the cross-sectional shape of the mounting hole 41 in the embodiment of the present utility model is specifically circular.

[0049] The present utility model also provides a down-the-hole impactor, including any of the above-mentioned impactor drill bit connection structures, which can also achieve the goal of not having to set a limiting groove on the drill bit 3. The drill bit 3 has higher strength and is less likely to break, thereby ensuring construction safety and reducing processing costs.

[0050] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hammer drill bit connection structure, characterized in that: It comprises an outer sleeve (1), a drill sleeve (2), a drill bit (3) and a limit assembly; The clamping sleeve (2) is fixedly connected to the outer sleeve (1), the inner wall of the clamping sleeve (2) is provided with splines (51) at circumferential intervals, and grooves (52) are formed between adjacent splines (51), the outer surface of the drill bit (3) is provided with spline grooves (61) at circumferential intervals, and bosses (62) are formed between adjacent spline grooves (61), the spline grooves (61) are used for transmission connection with the splines (51), and the limiting assembly is provided between the grooves (52) and the bosses (62) for limiting and constraining the axial displacement of the drill bit (3).

2. The hammer drill bit connection structure according to claim 1, characterized in that: At least two groups of the limiting components are provided, and are arranged at intervals in the circumferential direction around the drill bit (3).

3. The hammer drill bit connection structure according to claim 2, characterized in that: The limiting component includes: A mounting hole (41) provided on the groove (52); A limiting groove (42) is provided on the boss (62), wherein the limiting groove (42) extends along the axial direction of the drill bit (3); A positioning member (43) detachably connected to the mounting hole (41), the positioning member (43) being used in conjunction with the limiting groove (42) to limit and constrain the axial displacement of the drill bit (3).

4. The hammer drill bit connection structure according to claim 3, characterized in that: The length of the limiting groove (42) is smaller than the length of the boss (62).

5. The hammer drill bit connection structure according to claim 3, characterized in that: The clamping sleeve (2) comprises a connecting section (21), a transition section (22), and a positioning section (23) which are axially connected in sequence; The connecting section (21) and the outer sleeve (1) are connected via a threaded connection, the outer diameter of the positioning section (23) is larger than the outer diameters of the connecting section (21) and the transition section (22), the rear end of the positioning section (23) abuts against the front end of the outer sleeve (1), and the mounting hole (41) is provided on the transition section (22).

6. The hammer drill bit connection structure according to any one of claims 3 to 5, characterized in that: The positioning member (43) comprises a mounting portion and a positioning portion which are connected in sequence, the cross-sectional shape of the mounting portion is adapted to the cross-sectional shape of the mounting hole, and the positioning portion is specifically spherical.

7. The hammer drill bit connection structure according to claim 6, characterized in that: The mounting hole (41) is specifically a circular hole.

8. A down-the-hole impactor, characterized in that: The hammer drill bit connection structure comprises the hammer drill bit connection structure according to any one of claims 1 to 7.

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