A down-the-hole hammer

Abstract

The utility model provides a kind of down-the-hole hammer, it includes outer cylinder, joint, drill bit, gas distribution rod, check valve assembly and piston;Joint is arranged at one end of outer cylinder;Drill bit is arranged at the other end of outer cylinder;Gas distribution rod is arranged in outer cylinder;Check valve assembly is arranged in outer cylinder, and is located the air passage end portion of joint;Piston is arranged in outer cylinder, and can reciprocate between gas distribution rod and drill bit;Outer cylinder gas groove is opened on the inner wall of outer cylinder, and outer cylinder gas groove is formed by a plurality of outer cylinder gas groove units, and outer cylinder gas groove unit is recessed from the inner wall of outer cylinder to the direction away from axis, and each outer cylinder gas groove unit is sequentially spaced along the circumference of outer cylinder, and adjacent two outer cylinder gas groove units are separated by the inner wall of outer cylinder.Compared with prior art, the down-the-hole hammer provided by the utility model can better avoid accidental collision and scratches of piston, avoid early tensile fracture of piston, so as to improve the drilling speed of hammer.

Description

Technical Field

[0001] This utility model relates to the field of drilling equipment technology, and in particular to a down-the-hole impactor. Background Technology

[0002] A down-the-hole hammer is a rock drilling tool that uses impact energy to work. Its core principle is to convert the energy of fluid (usually compressed air or high-pressure water) into high-frequency mechanical impact energy. It is a basic piece of equipment in drilling engineering and is mainly used for impact breaking of rock strata or demolition operations.

[0003] like Figure 1 As shown, existing down-the-hole hammers typically include an outer cylinder 1, a connector 2, a valve stem 3, a check valve assembly 4, a piston 5, and a drill bit 6. During operation, compressed air is injected through the connector 2, then passes through the check valve assembly 4 and enters the valve stem 3, before being delivered to the piston 5. The compressed air drives the piston 5 to reciprocate, causing it to repeatedly impact the drill bit 6, thus achieving rock breaking. An outer cylinder air groove 101 is provided on the inner wall of the outer cylinder 1 to allow for gas flow.

[0004] In a down-the-hole impactor, under the action of high-pressure gas, piston 5 performs high-frequency up-and-down movements dozens of times per second within the outer cylinder 1. However, as... Figure 2 As shown, in the prior art, the outer cylinder groove 101 is an integral annular structure on the inner wall of the outer cylinder 1. Because the outer cylinder groove 101 is an annular groove, the piston 5 is prone to abrasion with the groove opening 1011 of the outer cylinder groove 101 when it moves up and down, causing the piston 5 to suffer premature scoring and breakage, affecting its service life, and also affecting the movement speed of the piston 5, thereby reducing the drilling speed of the down-the-hole impactor.

[0005] In addition, some down-the-hole impactors also have an inner cylinder 7 inside the outer cylinder 1, and the inner wall of the inner cylinder 7 is also provided with an inner cylinder air groove 701. However, as Figure 3 As shown, the inner cylinder groove 701 in the prior art is also an integral annular structure on the inner wall of the inner cylinder 7, which makes it easy for the piston 5 to be scratched by the groove opening of the inner cylinder groove 701 when it moves up and down.

[0006] Therefore, how to provide a new down-the-hole impactor is a technical problem that urgently needs to be solved in this field. Utility Model Content

[0007] This invention addresses the technical problem in existing down-the-hole (DH) impactors where the piston is prone to collision and abrasion with the opening of the outer cylinder's air groove during operation, affecting its service life and piston speed, thus reducing the DH's drilling speed. The DH improves upon this design by redesigning the outer cylinder's air groove on the inner wall of the outer cylinder. Instead of a single, integral groove structure, it adopts a multi-segment air groove unit structure. These units are spaced circumferentially, with adjacent units separated by the inner wall of the outer cylinder. This allows the inner wall of the outer cylinder to both ventilate and guide air through the air groove units, preventing abrasion between the piston and the outer cylinder's air groove opening. This solves the problem of early piston scoring and breakage, thereby extending service life. Furthermore, it better ensures the piston's operating speed, thus increasing the DH's drilling speed.

[0008] A down-the-hole impactor includes an outer cylinder, a connector, a drill bit, a valve rod, a check valve assembly, and a piston. The connector is located at one end of the outer cylinder; The drill bit is located at the other end of the outer cylinder; The valve stem is located inside the outer cylinder; The check valve assembly is disposed inside the outer cylinder and located at the end of the air passage of the connector; The piston is disposed inside the outer cylinder and can reciprocate between the valve stem and the drill bit; The outer cylinder has an outer cylinder air groove on its inner wall. The outer cylinder air groove is composed of multiple outer cylinder air groove units. The outer cylinder air groove units are formed by recessing from the inner wall of the outer cylinder in a direction away from the axis. Each outer cylinder air groove unit is arranged at intervals along the circumference of the outer cylinder. Adjacent outer cylinder air groove units are separated by the inner wall of the outer cylinder.

[0009] Preferably, each of the outer cylinder air groove units has the same shape and structure, and along the circumference of the outer cylinder, each of the outer cylinder air groove units is evenly spaced on the inner wall of the outer cylinder.

[0010] Preferably, the groove width of the outer cylinder air groove unit is greater than the distance between two adjacent outer cylinder air groove units.

[0011] Preferably, along the axial direction of the outer cylinder, each of the outer cylinder air groove units is located in the same position area.

[0012] Preferably, it also includes an inner cylinder, which is disposed inside the outer cylinder. An inner cylinder air groove is formed on the inner wall of the inner cylinder. The inner cylinder air groove is composed of multiple inner cylinder air groove units. The inner cylinder air groove units are recessed from the inner wall of the inner cylinder in a direction away from the axis. Each inner cylinder air groove unit is arranged sequentially at intervals along the circumference of the inner cylinder. Adjacent inner cylinder air groove units are separated by the inner wall of the inner cylinder.

[0013] Preferably, each of the inner cylinder air groove units has the same shape and structure, and the inner cylinder air groove units are evenly spaced along the circumference of the inner cylinder on the inner wall of the inner cylinder.

[0014] Preferably, the groove width of the inner cylinder air groove unit is greater than the distance between two adjacent inner cylinder air groove units.

[0015] Preferably, the groove width of the inner cylinder air groove unit is greater than the groove width of the outer cylinder air groove unit.

[0016] Preferably, along the axial direction of the inner cylinder, each of the inner cylinder air groove units is located in the same position area.

[0017] Preferably, both the outer cylinder air groove unit and the inner cylinder air groove unit are waist-shaped air grooves, and both the outer cylinder air groove unit and the inner cylinder air groove unit extend axially.

[0018] Compared with the prior art, the down-the-hole impactor provided by this utility model includes an outer cylinder, a connector, a drill bit, a valve rod, a check valve assembly, and a piston. The connector is located at one end of the outer cylinder; the drill bit is located at the other end of the outer cylinder; the valve rod is located inside the outer cylinder; the check valve assembly is located inside the outer cylinder and at the end of the air passage of the connector; the piston is located inside the outer cylinder and can reciprocate between the valve rod and the drill bit. The inner wall of the outer cylinder has an outer cylinder air groove, which is composed of multiple outer cylinder air groove units. Each outer cylinder air groove unit is recessed from the inner wall of the outer cylinder in a direction away from the axis, and each outer cylinder air groove unit is arranged sequentially at intervals along the circumference of the outer cylinder. Adjacent outer cylinder air groove units are separated by the inner wall of the outer cylinder. The outer cylinder air groove of the down-the-hole impactor is composed of multiple outer cylinder air groove units, which are arranged sequentially at intervals along the circumference of the outer cylinder and separated by the inner wall of the outer cylinder. This allows the piston to be guided by the inner wall of the outer cylinder as it moves through the air grooves, preventing piston abrasion and solving the problem of premature piston scoring and breakage, thus extending its service life. It also better ensures the piston's operating speed, thereby increasing the drilling speed of the down-the-hole impactor. Simultaneously, the multiple outer cylinder air groove units allow for smooth airflow without affecting normal ventilation. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a cross-sectional structural diagram of some components in a conventional down-the-hole impactor. Figure 2 for Figure 1 A schematic diagram of the three-dimensional structure of the outer cylinder section shown below; Figure 3 for Figure 1 A schematic diagram of the three-dimensional structure of the inner cylinder after it has been cut open. Figure 4 A cross-sectional structural schematic diagram of some components in a down-the-hole impactor provided in one embodiment; Figure 5 for Figure 4 A schematic diagram of the three-dimensional structure of the outer cylinder section shown below; Figure 6 for Figure 4 A schematic cross-sectional view of the outer cylinder section shown. Figure 7 for Figure 4 A schematic diagram of the transverse cross-sectional structure of the outer cylinder's air groove. Figure 8 for Figure 4 A schematic diagram of the three-dimensional structure of the inner cylinder after it has been cut open. Explanation of reference numerals in the attached figures: Outer cylinder 1, outer cylinder air groove 101, groove opening 1011, connector 2, air distribution rod 3, check valve assembly 4, piston 5, drill bit 6, inner cylinder 7, inner cylinder air groove 701; Down-the-hole hammer 100, outer cylinder 10, inner wall of outer cylinder 11, outer cylinder air groove 12, outer cylinder air groove unit 121, connector 20, drill bit 30, air distribution rod 40, check valve assembly 50, piston 60, inner cylinder 70, inner wall of inner cylinder 71, inner cylinder air groove 72, inner cylinder air groove unit 721. Detailed Implementation

[0021] To enable those skilled in the art to 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 described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] It should be noted that when a component is referred to as "mounted on", "fixed on", or "set on" another component, it can be directly on or indirectly set on the other component; when a component is referred to as "connected to" another component, it can be directly connected to or indirectly connected to the other component.

[0023] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0024] This utility model provides a down-the-hole impactor, which includes an outer cylinder, a connector, a drill bit, a valve rod, a check valve assembly, and a piston. The connector is located at one end of the outer cylinder; the drill bit is located at the other end of the outer cylinder; the valve rod is located inside the outer cylinder; the check valve assembly is located inside the outer cylinder and at the end of the air passage of the connector; the piston is located inside the outer cylinder and can reciprocate between the valve rod and the drill bit. The inner wall of the outer cylinder has an outer cylinder air groove, which is composed of multiple outer cylinder air groove units. Each outer cylinder air groove unit is recessed from the inner wall of the outer cylinder in a direction away from the axis, and each outer cylinder air groove unit is arranged sequentially at intervals along the circumference of the outer cylinder. Adjacent outer cylinder air groove units are separated by the inner wall of the outer cylinder. The outer cylinder air groove of the down-the-hole impactor is composed of multiple outer cylinder air groove units, which are arranged sequentially at intervals along the circumference of the outer cylinder and separated by the inner wall of the outer cylinder. This allows the piston to be guided by the inner wall of the outer cylinder as it moves through the air grooves, preventing piston abrasion and solving the problem of premature piston scoring and breakage, thus extending its service life. It also better ensures the piston's operating speed, thereby increasing the drilling speed of the down-the-hole impactor. Simultaneously, the multiple outer cylinder air groove units allow for smooth airflow without affecting normal ventilation.

[0025] Please refer to the following: Figures 4 to 8In one embodiment, a down-the-hole impactor 100 is provided, which mainly addresses the problem in existing down-the-hole impactors where the piston easily collides and scratches with the opening of the outer cylinder groove during movement. The down-the-hole impactor 100 improves the structure of the outer cylinder groove, no longer using a single integral annular groove, but rather a multi-segment structure. The outer cylinder groove is composed of multiple circumferentially spaced outer cylinder groove units, allowing the piston to be guided through the inner wall of the outer cylinder during movement, thereby preventing collision and scratching between the piston and the opening of the outer cylinder groove.

[0026] The down-the-hole hammer 100 includes an outer cylinder 10, a connector 20, a drill bit 30, an air distribution rod 40, a check valve assembly 50, and a piston 60. The connector 20 is located at one end of the outer cylinder 10, and the drill bit 30 is located at the other end of the outer cylinder 10. The air distribution rod 40 is located inside the outer cylinder 10, and the check valve assembly 50 is located inside the outer cylinder 10 and at the end of the air passage of the connector 10. The piston 60 is located inside the outer cylinder 10 and can reciprocate between the air distribution rod 40 and the drill bit 30. When the down-the-hole hammer 100 is working, compressed air is injected through the connector 20, then passes through the check valve assembly 50, enters the air distribution rod 40, and is then delivered to the piston 60. The compressed air drives the piston 60 to reciprocate, causing the piston 60 to repeatedly impact the drill bit 30, thereby achieving the effect of breaking the rock strata. The connector 20, the drill bit 30, the air distribution rod 40, the check valve assembly 50, and the piston 60 can all adopt existing structures. These structures are not the main improvements of this application and will not be described in detail below.

[0027] The inner wall 11 of the outer cylinder 10 is provided with an outer cylinder air groove 12, which is composed of multiple outer cylinder air groove units 121. Each outer cylinder air groove unit 121 is recessed from the inner wall 11 of the outer cylinder 10 in a direction away from the axis, i.e., the outer cylinder air groove unit 121 is recessed outward from the inner wall 11 of the outer cylinder 10. The outer cylinder air groove units 121 are arranged sequentially at intervals along the circumference of the outer cylinder 10, and adjacent outer cylinder air groove units 121 are separated by the inner wall 11 of the outer cylinder 10. In other words, the outer cylinder air groove units 121 are not interconnected, and along the circumference of the outer cylinder 10, the outer cylinder air groove units 121 are spaced apart by the inner wall 11 of the outer cylinder 10.

[0028] Understandably, in the existing technology, the outer cylinder air groove opened on the inner wall of the outer cylinder is an annular air groove. When the piston moves through the outer cylinder air groove, because the outer cylinder air groove is an integral annular air groove, the piston is not guided and limited by the structure at this point, which makes the piston prone to a certain degree of deflection. As a result, the piston is prone to collision and abrasion with the groove opening of the outer cylinder air groove during movement, causing the piston to be prematurely strained and broken, affecting the service life of the piston, and also affecting the piston's movement speed, thereby reducing the drilling speed of the down-the-hole impactor.

[0029] In the down-the-hole impactor 100 provided in this embodiment, the outer cylinder air groove 12 opened on the inner wall 11 of the outer cylinder 10 no longer adopts an integral annular structure, but is composed of multiple circumferentially spaced outer cylinder air groove units 121. Since adjacent outer cylinder air groove units 121 are separated by the inner wall 11 of the outer cylinder 10, when the piston 60 moves through the outer cylinder air groove 12, the piston 60 can be guided by the inner wall 11 of the outer cylinder 10 between adjacent outer cylinder air groove units 121, thereby avoiding a certain degree of deflection of the piston 60 and stabilizing the movement position of the piston 60. With this structure, collision and scratches between the piston 60 and the groove opening of the outer cylinder air groove unit 121 are avoided, making the piston 60 less prone to scoring and breakage, thus improving the service life of the piston 60. In addition, it can also better ensure the running speed of the piston 60, thereby improving the drilling speed of the down-the-hole impactor. Meanwhile, the multiple outer cylinder air groove units 121 also allow for smooth airflow without affecting normal ventilation.

[0030] Preferably, in one embodiment, the outer cylinder air groove units 121 have the same shape and structure, and are evenly spaced along the circumference of the outer cylinder 10 on the inner wall 11 of the outer cylinder 10. That is, in this embodiment, the outer cylinder air groove units 121 on the outer cylinder 10 are evenly spaced along the circumference, allowing airflow to pass evenly from all sides and ensuring the stability of the piston 60's movement.

[0031] Specifically, in one embodiment, the outer cylinder air groove unit 121 is provided with twelve grooves, all of which have the same shape and structure, and are evenly spaced along the circumference of the outer cylinder 10 on the inner wall 11 of the outer cylinder 10.

[0032] Preferably, in one embodiment, the width of the outer cylinder air groove unit 121 is greater than the distance between two adjacent outer cylinder air groove units 121. Here, the width of the outer cylinder air groove unit 121 refers to its circumferential dimension. That is, in this embodiment, the circumferential dimension of the outer cylinder air groove unit 121 is greater than the dimension of the inner wall 11 of the outer cylinder 10 located between two adjacent outer cylinder air groove units 121. This structural design maximizes the ventilation area of ​​the outer cylinder air groove unit 121, thereby improving gas flow efficiency.

[0033] Preferably, in one embodiment, the outer cylinder air groove units 121 are located in the same position area along the axial direction of the outer cylinder 10. That is, in this embodiment, the outer cylinder air groove units 121 are all located at the same position in the axial direction, and there is no misalignment of the outer cylinder air groove units 121 in the axial direction, so that the airflow is more balanced and the stability of the piston 60 movement is guaranteed.

[0034] Preferably, in one embodiment, the down-the-hole impactor 100 further includes an inner cylinder 70 disposed within the outer cylinder 10. An inner cylinder air groove 72 is formed on the inner wall 71 of the inner cylinder 70. The inner cylinder air groove 72 is composed of multiple inner cylinder air groove units 721, each unit being recessed from the inner wall 71 of the inner cylinder 70 in a direction away from the axis, i.e., the inner cylinder air groove unit 721 is recessed outward from the inner wall 71 of the inner cylinder 70. Each inner cylinder air groove unit 721 is arranged sequentially at intervals along the circumference of the inner cylinder 70, with adjacent units separated by the inner wall 71 of the inner cylinder 70. In other words, the inner cylinder air groove units 721 are not interconnected and are spaced apart from each other by the inner wall 71 along the circumference of the inner cylinder 70.

[0035] In other words, in this embodiment, the inner cylinder air groove 72 formed on the inner wall 71 of the inner cylinder 70 no longer adopts a single annular structure, but is composed of multiple circumferentially spaced inner cylinder air groove units 721. Since adjacent inner cylinder air groove units 721 are separated by the inner wall 71 of the inner cylinder 70, when the piston 60 moves past the inner cylinder air groove 72, the piston 60 can be guided by the inner wall 71 of the inner cylinder 70 between adjacent inner cylinder air groove units 721, thereby preventing the piston 60 from deflecting to a certain extent and stabilizing the movement position of the piston 60. This structure avoids collisions and abrasions between the piston 60 and the groove openings of the inner cylinder air groove units 721, making the piston 60 less prone to scoring and breakage, thus improving the service life of the piston 60. Furthermore, it better ensures the piston's operating speed, thereby increasing the drilling speed of the down-the-hole impactor. Meanwhile, the multiple inner cylinder air groove units 721 also allow for smooth airflow without affecting normal ventilation.

[0036] Preferably, in one embodiment, the inner cylinder air groove units 721 have the same shape and structure, and are evenly spaced along the circumference of the inner cylinder 70 on the inner wall 71 of the inner cylinder 70. That is, in this embodiment, the inner cylinder air groove units 721 on the inner cylinder 70 are also evenly spaced along the circumference, thereby allowing airflow to pass evenly from all sides and ensuring the stability of the piston 60's movement.

[0037] Preferably, in one embodiment, the width of the inner cylinder air groove unit 721 is greater than the distance between two adjacent inner cylinder air groove units 721. Here, the width of the inner cylinder air groove unit 721 refers to its circumferential dimension. That is, in this embodiment, the circumferential dimension of the inner cylinder air groove unit 721 is greater than the dimension of the inner wall 71 of the inner cylinder 70 located between two adjacent inner cylinder air groove units 721. This structural design maximizes the ventilation area of ​​the inner cylinder air groove unit 721, improving gas flow efficiency.

[0038] Preferably, in one embodiment, the groove width of the inner cylinder groove unit 721 is greater than the groove width of the outer cylinder groove unit 121, and the number of outer cylinder groove units 121 is greater than the number of inner cylinder groove units 721.

[0039] Preferably, in one embodiment, the inner cylinder air groove units 721 are located in the same position area along the axial direction of the inner cylinder 70. That is, in this embodiment, the inner cylinder air groove units 721 are all located at the same position in the axial direction, and there is no misalignment of the inner cylinder air groove units 721 in the axial direction, which allows for more balanced airflow and ensures the stability of the piston 60 movement.

[0040] Preferably, in one embodiment, both the outer cylinder groove unit 121 and the inner cylinder groove unit 721 are waist-shaped grooves, and both extend axially. That is, in this embodiment, each outer cylinder groove unit 121 and each inner cylinder groove unit 721 is a waist-shaped groove, where a waist-shaped groove refers to an elongated oval groove structure with semi-circular ends and a rectangular middle section. By setting each outer cylinder groove unit 121 and each inner cylinder groove unit 721 as a waist-shaped groove and extending axially, the stability of the valve train can be improved, ensuring the stability of the piston 60's movement.

[0041] The above description is merely an embodiment of this utility model. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of this utility model, but these improvements all fall within the protection scope of this utility model.

Claims

1. A rock drill, characterized in that Includes outer cylinder, connector, drill bit, valve stem, check valve assembly, and piston; The connector is located at one end of the outer cylinder; The drill bit is located at the other end of the outer cylinder; The valve stem is located inside the outer cylinder; The check valve assembly is disposed inside the outer cylinder and located at the end of the air passage of the connector; The piston is disposed inside the outer cylinder and can reciprocate between the valve stem and the drill bit; The outer cylinder has an outer cylinder air groove on its inner wall. The outer cylinder air groove is composed of multiple outer cylinder air groove units. The outer cylinder air groove units are formed by recessing from the inner wall of the outer cylinder in a direction away from the axis. Each outer cylinder air groove unit is arranged at intervals along the circumference of the outer cylinder. Adjacent outer cylinder air groove units are separated by the inner wall of the outer cylinder.

2. The down-the-hole impactor according to claim 1, characterized in that, Each of the outer cylinder air groove units has the same shape and structure, and along the circumference of the outer cylinder, each of the outer cylinder air groove units is evenly spaced on the inner wall of the outer cylinder.

3. The down-the-hole impactor according to claim 2, characterized in that, The width of the outer cylinder air groove unit is greater than the distance between two adjacent outer cylinder air groove units.

4. The down-the-hole impactor according to claim 1, characterized in that, Along the axial direction of the outer cylinder, each of the outer cylinder air groove units is located in the same position area.

5. The down-the-hole impactor according to any one of claims 1 to 4, characterized in that, It also includes an inner cylinder, which is disposed inside the outer cylinder. An inner cylinder air groove is formed on the inner wall of the inner cylinder. The inner cylinder air groove is composed of multiple inner cylinder air groove units. The inner cylinder air groove units are recessed from the inner wall of the inner cylinder in a direction away from the axis. Each inner cylinder air groove unit is arranged sequentially at intervals along the circumference of the inner cylinder. Adjacent inner cylinder air groove units are separated by the inner wall of the inner cylinder.

6. The down-the-hole impactor according to claim 5, characterized in that, Each of the inner cylinder air groove units has the same shape and structure, and along the circumference of the inner cylinder, each of the inner cylinder air groove units is evenly spaced on the inner wall of the inner cylinder.

7. The down-the-hole impactor according to claim 6, characterized in that, The width of the inner cylinder air groove unit is greater than the distance between two adjacent inner cylinder air groove units.

8. The down-the-hole impactor according to claim 7, characterized in that, The groove width of the inner cylinder air groove unit is greater than the groove width of the outer cylinder air groove unit.

9. The down-the-hole impactor according to claim 5, characterized in that, Along the axial direction of the inner cylinder, each of the inner cylinder air groove units is located in the same position area.

10. The down-the-hole impactor according to claim 5, characterized in that, Both the outer cylinder air groove unit and the inner cylinder air groove unit are waist-shaped air grooves, and both the outer cylinder air groove unit and the inner cylinder air groove unit extend axially.

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