Down-hole hammer

Abstract

The utility model discloses a down-hole hammer which comprises a piston, a piston rod, a piston rod and a driving device. The drill bit is arranged at the front end of the piston, a tail pipe is arranged at the rear end of the drill bit, the rear end of the tail pipe extends into the central channel, and the tail pipe is in sliding connection with the piston; the air distribution ring is arranged between the piston and the tail pipe, the air distribution ring is fixedly connected with the piston, and the air distribution ring is in clearance fit with the tail pipe. Compared with the prior art, the down-hole hammer is simple in structure, the service life of the tail pipe can be prolonged, and the problem that the tail pipe is abraded and even broken too early is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of drilling machinery and equipment, and more specifically, to a down-the-hole impactor. Background Art

[0002] With the development of industry, various infrastructure projects are constantly advancing. As drilling equipment, down-the-hole impactors are widely used in blasting projects in the construction of mines, hydropower stations, ports, roads, tunnels, etc., for drilling blasting holes, etc. Pneumatic down-the-hole impactors use high-pressure air as a power source to drive the piston in the impactor to reciprocate at high speed and high frequency, so that the piston obtains enough energy to impact the drill bit for drilling operations. The impact force acts on the drill bit in the form of stress waves, generating huge impact energy in a very short time, which can effectively break the rock and quickly form holes to achieve the purpose of rock drilling.

[0003] At present, the down-the-hole impactor includes a first outer cylinder, a joint assembly, a first piston and a first drill bit, wherein the two ends of the first outer cylinder are respectively connected to the joint assembly and the first drill bit, the first piston is movably arranged in the first outer cylinder, and the high-pressure gas enters the first outer cylinder through the joint assembly. Due to the pressure difference between the two ends of the first piston, the first piston is pushed to move back and forth, thereby providing an impact force to the first drill bit. In order to realize the reciprocating movement of the first piston, a central channel is often provided in the first piston, and a first tail pipe is provided on the first drill bit, and the first tail pipe is used to cooperate with the central channel for gas distribution. However, due to the high frequency of the first piston impacting the drill bit, the first tail pipe contacts the first piston, and the first tail pipe is prone to wear or even breakage. Excessive wear of the first tail pipe can easily cause the down-the-hole impactor to have a pressure drop problem. If the first tail pipe breaks, the down-the-hole impactor cannot work normally.

[0004] Therefore, there is an urgent need for a down-the-hole impactor with a simple structure that can extend the life of the tail pipe and avoid the problem of premature wear or even breakage of the tail pipe. Utility Model Content

[0005] In order to solve the above technical problems, the present application provides a down-the-hole impactor with a simple structure, which can extend the life of the tail pipe and avoid the problem of premature wear or even breakage of the tail pipe.

[0006] The technical solutions provided by this application are as follows:

[0007] A down-the-hole impactor, comprising:

[0008] A piston having a central passage therein;

[0009] A drill bit is arranged at the front end of the piston, a tail pipe is arranged at the rear end of the drill bit, the rear end of the tail pipe extends into the central channel, and the tail pipe is slidably connected to the piston;

[0010] A valve ring is arranged between the piston and the tail pipe, the valve ring is fixedly connected to the piston, and there is a clearance fit between the valve ring and the tail pipe.

[0011] Preferably, the valve ring and the piston are detachably connected.

[0012] Preferably, it also includes:

[0013] An annular groove is arranged on the inner wall of the central channel, the cross-sectional shape of the gas distribution ring is adapted to the annular groove, the annular groove is used to accommodate the gas distribution ring, and the gas distribution ring is detachably connected to the annular groove.

[0014] Preferably, the cross-sectional shape of the valve ring is circular or rectangular.

[0015] Preferably, the valve ring is a ring-shaped structure, and the inner diameter of the valve ring is larger than the outer diameter of the tail pipe.

[0016] Preferably, the valve ring is a ring-shaped structure with an opening.

[0017] Preferably, at least two gas distribution rings are provided, and the gas distribution rings are arranged at intervals along the axial direction of the central channel.

[0018] Preferably, the valve ring is made of rubber material, and the tail pipe is made of nylon material.

[0019] Preferably, the central channel comprises: a first channel and a second channel connected in sequence;

[0020] The second channel is used in conjunction with the tail pipe, the valve ring is arranged on the inner wall of the second channel, and the inner diameter of the second channel is greater than the inner diameter of the first channel.

[0021] Preferably, the valve ring is arranged at an end of the second passage away from the first passage.

[0022] The down-the-hole impactor provided by the utility model is firstly provided with a piston and a drill bit, wherein a central channel is provided in the piston, the central channel is used for gas distribution so that there is a pressure difference on both sides of the piston, thereby pushing the piston to reciprocate along its axial direction, the drill bit is arranged at the front end of the piston, an exhaust channel is arranged in the drill bit, the exhaust channel discharges the gas inside the down-the-hole impactor, a tail pipe is arranged on the rear end of the drill bit, the tail pipe is used to communicate with the exhaust channel, the tail pipe extends away from the rear end of the drill bit to the central channel, and the tail pipe can be slidably sleeved in the central channel. Secondly, a gas distribution ring is also provided, the gas distribution ring is arranged between the piston and the tail pipe, the gas distribution ring is fixedly connected to the piston, and the gas distribution ring and the tail pipe are specifically clearance-matched. Due to the provision of the gas distribution ring, the friction and wear between the tail pipe and the inner wall of the piston are reduced, and the problem of tail pipe wear or even breakage is avoided, thereby extending the service life of the down-the-hole impactor. It can be seen that compared with the prior art, the down-the-hole impactor in the embodiment of the utility model has a simple structure, can extend the life of the tail pipe, and avoid the problem of premature wear or even breakage of the tail pipe. 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 drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 paying creative work.

[0024] Figure 1 A schematic diagram of the structure of a down-the-hole impactor in the prior art;

[0025] Figure 2 A schematic diagram of the first structure of the down-the-hole impactor provided in the embodiment of the utility model;

[0026] Figure 3 A second structural schematic diagram of a down-the-hole impactor provided in an embodiment of the utility model;

[0027] Figure 4 A third structural schematic diagram of the down-the-hole impactor provided in an embodiment of the utility model;

[0028] Figure 5 A fourth structural schematic diagram of a down-the-hole impactor provided in an embodiment of the utility model;

[0029] Figure 6 A schematic diagram of the first structure of the valve distribution ring provided in the embodiment of the utility model;

[0030] Figure 7 A second structural schematic diagram of a valve distribution ring provided in an embodiment of the utility model;

[0031] Figure 8 A third structural schematic diagram of the valve distribution ring provided in the embodiment of the utility model;

[0032] Fig. 9 A fourth structural schematic diagram of the valve distribution ring provided in an embodiment of the utility model.

[0033] Reference numerals:

[0034] 01. First piston; 02. First drill bit; 03. First tail pipe; 04. First outer cylinder;

[0035] 1. Piston; 2. Drill bit; 21. Exhaust channel; 3. Tail pipe; 4. Valve ring; 5. Annular groove; 61. First channel; 62. Second channel. DETAILED DESCRIPTION

[0036] In order 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 are clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0037] 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.

[0038] 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 drawings, and are only for the convenience of describing the present 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 should not be understood as a limitation on the present application.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0040] 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 effects and purposes that can be achieved by this application.

[0041] The embodiments of the present invention are written in a progressive manner.

[0042] like Figures 2 to 9 As shown, an embodiment of the utility model provides a down-the-hole impactor, comprising: a piston 1, wherein a central channel is provided in the piston 1; a drill bit 2 arranged at the front end of the piston 1, wherein an exhaust channel 21 is provided in the drill bit 2; a tail pipe 3 arranged at the rear end of the drill bit 2 and used to communicate with the exhaust channel 21, wherein the tail pipe 3 is slidably mounted in the central channel away from the rear end of the drill bit 2; a valve ring 4 arranged between the piston 1 and the tail pipe 3, wherein the valve ring 4 is fixedly connected to the piston 1, and a clearance fit is provided between the valve ring 4 and the tail pipe 3.

[0043] Please Figure 1 As shown, the down-the-hole impactor in the prior art includes a first outer cylinder 04, a first piston 01 and a first drill bit 02, the first drill bit 02 is arranged at the front end of the first outer cylinder 04, the first piston 01 is slidably arranged in the first outer cylinder 04, there is an air pressure difference at both ends of the first piston 01, the first piston 01 is pushed to reciprocate in the first outer cylinder 04, and the first drill bit 02 is impacted, and a first tail pipe 03 is arranged at the rear end of the first drill bit 02, there is friction between the first tail pipe 03 and the inner wall of the first piston 01, the first piston 01 moves in the first outer cylinder at a high frequency, so that the first tail pipe 03 and the first piston 01 frequently contact and distribute air, which makes it easy for the first tail pipe 03 to be worn or even broken. When the wear amount of the first tail pipe 03 is too large, the down-the-hole impactor has a problem of pressure drop. If the first tail pipe 03 is broken, the down-the-hole impactor cannot work normally. In addition, since the first piston 01 in the prior art reciprocates, the processing precision of the part where the first piston 01 cooperates with the first tail pipe 03 is high, and the inner wall of the first piston 01 is often required to be ground, which results in complex processing technology and high processing cost.

[0044] The down-the-hole impactor provided by the utility model is provided with a piston 1 and a drill bit 2, wherein a central channel is provided in the piston 1, and the central channel is used for gas distribution so that there is a pressure difference on both sides of the piston 1, thereby pushing the piston 1 to reciprocate along its axial direction, and the drill bit 2 is arranged at the front end of the piston 1, and an exhaust channel 21 is arranged in the drill bit 2, and the exhaust channel 21 discharges the gas inside the down-the-hole impactor, and a tail pipe 3 is arranged on the rear end of the drill bit 2, and the tail pipe 3 is used to communicate with the exhaust channel 21, and the tail pipe 3 extends away from the rear end of the drill bit 2 to the central channel, and the tail pipe 3 can be slidably mounted in the central channel. Secondly, a gas distribution ring 4 is also provided, and the gas distribution ring 4 is arranged between the piston 1 and the tail pipe 3, and the gas distribution ring 4 is fixedly connected to the piston 1, and the gas distribution ring 4 and the tail pipe 3 are specifically clearance-fitted. Due to the provision of the gas distribution ring 4, the friction and wear between the tail pipe 3 and the inner wall of the piston 1 are reduced, and the problem of wear or even breakage of the tail pipe 3 is avoided, thereby extending the service life of the down-the-hole impactor. It can be seen that, compared with the prior art, the down-the-hole impactor in the embodiment of the utility model has a simple structure, can extend the life of the tail pipe 3, and avoid the problem of premature wear or even breakage of the tail pipe 3.

[0045] Furthermore, since the valve ring 4 is provided, the inner wall of the valve ring 4 in the embodiment of the utility model cooperates with the tail pipe 3, so that the inner wall precision requirement of the piston 1 in the embodiment of the utility model is low, which reduces the processing difficulty and processing cost.

[0046] Furthermore, as the piston 1 continuously reciprocates axially, the valve ring 4 continuously rubs and wears against the tail pipe 3, which easily causes the aperture of the valve ring 4 to become larger. As one implementation, the valve ring 4 and the piston 1 in the embodiment of the utility model are specifically detachably connected, and when the valve ring 4 is worn to a certain extent, the valve ring 4 can be replaced in time.

[0047] As one of the specific implementation methods, the down-the-hole impactor in the embodiment of the utility model also includes an annular groove 5, which is arranged on the inner wall of the central channel. The cross-sectional shape of the valve ring 4 is adapted to the shape of the annular groove 5. The annular groove 5 is used to place the valve ring 4. The valve ring 4 and the annular groove 5 are specifically detachably connected, which makes it easy to replace the valve ring 4.

[0048] Furthermore, as one implementation method, Figure 7 and Figure 8 As shown, the cross-sectional shape of the valve ring 4 in the embodiment of the utility model is specifically a circle. Figure 6 As shown, the cross-sectional shape of the valve ring 4 in the embodiment of the utility model is specifically a rectangle, and the cross-sectional shape of the valve ring 4 is adapted to that of the annular groove 5 .

[0049] Furthermore, as one implementation mode, the valve ring 4 in the embodiment of the utility model is specifically a ring structure, and the inner diameter of the valve ring 4 is larger than the outer diameter of the tail pipe 3, so that the valve ring 4 and the tail pipe 3 can be slidably connected.

[0050] Furthermore, please Figures 6 to 8 As shown, the valve ring 4 in the embodiment of the utility model is specifically a ring structure with an opening, and can also be a closed ring structure. As a preferred embodiment, please refer to Fig. 9 As shown, the valve ring 4 in the embodiment of the utility model is preferably a ring structure with an opening, so that the installation and replacement of the valve ring 4 are more convenient.

[0051] Furthermore, as one implementation mode, at least two valve distribution rings 4 are provided in the embodiment of the utility model, and the valve distribution rings 4 are arranged at intervals along the axial direction of the central channel.

[0052] Specifically, there can be at least one gas distribution ring 4, or at least two gas distribution rings 4 can be provided. Figures 2 to 3 As shown, the valve ring 4 is provided with one, and the contact area between the valve ring 4 and the nylon tube is small, and the friction and wear on the nylon tube is small, but the valve ring 4 wears quickly, and the frequency of replacing the valve ring 4 is high. Figures 4 to 5 As shown, when at least two valve rings 4 are provided, the contact area between the valve rings 4 and the nylon tube is large, and the friction and wear on the nylon tube is large, but the service life of the valve rings 4 can be extended.

[0053] Furthermore, as one of the implementation modes, the valve ring 4 in the embodiment of the utility model is specifically made of rubber material, and the tail pipe 3 is specifically made of nylon material. In order to ensure the rigidity of the piston 1 and the drill bit 2, the piston 1 and the drill bit 2 are often made of rigid materials, while the tail pipe 3 and the piston 1 are in rigid-rigid contact, and the mating surface is relatively long, which is prone to the problem of nylon tube breakage and wear. On the one hand, the valve ring 4 in the embodiment of the utility model is made of rubber material, and the nylon tube and the valve ring 4 are in rigid-flexible contact, which reduces the friction and wear of the nylon tube, and the contact area between the nylon tube and the valve ring 4 becomes smaller, thereby avoiding the problem of nylon tube breakage and wear; on the other hand, the valve ring 4 made of rubber material is easy to disassemble, assemble and replace, and saves the grinding process at the inner hole of the piston 1, saving processing costs.

[0054] Furthermore, as one of the specific implementations, the central channel in the embodiment of the utility model includes a first channel 61 and a second channel 62, wherein the second channel 62 is connected to the first channel 61, the second channel 62 is used in conjunction with the tail pipe 3, the valve ring 4 is arranged on the inner wall of the second channel 62, and the inner diameter of the second channel 62 is larger than the inner diameter of the first channel 61.

[0055] Furthermore, in order to facilitate the replacement of the valve ring 4 , as one implementation mode, the valve ring 4 in the embodiment of the utility model is arranged at an end of the second channel 62 away from the first channel 61 .

[0056] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those 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 will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A down-the-hole impactor, characterized in that: include: A piston (1), wherein a central channel is provided in the piston (1); A drill bit (2) is arranged at the front end of the piston (1), a tail pipe (3) is arranged at the rear end of the drill bit (2), the rear end of the tail pipe (3) extends into the central channel, and the tail pipe (3) is slidably connected to the piston (1); A valve ring (4) is arranged between the piston (1) and the tail pipe (3); the valve ring (4) is fixedly connected to the piston (1); and there is a clearance fit between the valve ring (4) and the tail pipe (3).

2. The down-the-hole impactor according to claim 1, characterized in that: The valve ring (4) and the piston (1) are specifically detachably connected.

3. The down-the-hole impactor according to claim 2, characterized in that: Also includes: An annular groove (5) is provided on the inner wall of the central channel, the cross-sectional shape of the gas distribution ring (4) is adapted to the annular groove (5), the annular groove (5) is used to accommodate the gas distribution ring (4), and the gas distribution ring (4) and the annular groove (5) are detachably connected.

4. The down-the-hole impactor according to claim 3, characterized in that: The cross-sectional shape of the valve ring (4) is specifically circular or rectangular.

5. The down-the-hole impactor according to claim 4, characterized in that: The valve ring (4) is specifically a ring-shaped structure, and the inner diameter of the valve ring (4) is larger than the outer diameter of the tail pipe (3).

6. The down-the-hole impactor according to claim 5, characterized in that: The valve ring (4) is specifically a ring-shaped structure with an opening.

7. The down-the-hole impactor according to any one of claims 1 to 6, characterized in that: At least two of the gas distribution rings (4) are provided, and the gas distribution rings (4) are arranged at intervals along the axial direction of the central channel.

8. The down-the-hole impactor according to any one of claims 1 to 6, characterized in that: The valve ring (4) is specifically made of a rubber material, and the tail pipe (3) is specifically made of a nylon material.

9. The down-the-hole impactor according to any one of claims 1 to 6, characterized in that: The central channel comprises: a first channel (61) and a second channel (62) which are connected in sequence; The second channel (62) is used in conjunction with the tail pipe (3); the valve ring (4) is arranged on the inner wall of the second channel (62); and the inner diameter of the second channel (62) is greater than the inner diameter of the first channel (61).

10. The down-the-hole impactor according to claim 9, characterized in that: The valve ring (4) is arranged at an end of the second channel (62) away from the first channel (61).

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