Down-hole hammer

Abstract

The down-the-hole hammer comprises an outer sleeve, the front end of the outer sleeve is connected with a drill bit assembly, the rear end of the outer sleeve is connected with a connector, and a high-pressure air channel is formed in the connector; the piston is movably arranged in the outer sleeve, a front air chamber is formed among the piston, the outer sleeve and the drill bit assembly, a rear air chamber is formed among the piston, the connector and the outer sleeve, and a first channel communicated with the front air chamber and a second channel communicated with the rear air chamber are formed between the piston and the outer sleeve; and the gas distribution rod is detachably arranged at the rear end of the piston, a gas distribution channel is formed in the gas distribution rod, and the gas distribution rod is used for being matched with the connector for use, so that the high-pressure gas channel has a first state communicating with the first channel and a second state communicating with the second channel. Compared with the prior art, the down-hole hammer has the advantages that abrasion and abrasion between the air distribution seat and the piston can be avoided, and the service life of the down-hole hammer is prolonged.

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] The down-the-hole impactor in the prior art often uses a valve seat and a piston to distribute gas. However, the current valve seat and the piston are made of rigid materials. Under the continuous high-frequency impact of the piston, the inner wall of the piston often becomes scratched or worn, which increases the gap between the piston and the valve seat, affecting the performance of the impactor, resulting in high gas consumption, weak impact, and slow working efficiency.

[0004] Therefore, there is an urgent need for a down-the-hole impactor that can avoid scratches and wear between the valve seat and the piston and increase the service life of the down-the-hole impactor. Utility Model Content

[0005] In order to solve the above technical problems, the present application provides a down-the-hole impactor, which can avoid scratches and wear between the valve seat and the piston, and improve the service life of the down-the-hole impactor.

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

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

[0008] An outer sleeve, the front end of which is connected to the drill bit assembly, the rear end of which is connected to a joint, and a high-pressure airway is provided in the joint;

[0009] A piston is movably arranged in the outer sleeve, a front air chamber is formed between the piston, the outer sleeve and the drill bit assembly, a rear air chamber is formed between the piston, the joint and the outer sleeve, and a first channel communicating with the front air chamber and a second channel communicating with the rear air chamber are formed between the piston and the outer sleeve;

[0010] A gas distribution rod detachably arranged at the rear end of the piston, a gas distribution channel is arranged in the gas distribution rod, and the gas distribution rod is used to cooperate with the joint so that the high-pressure air passage has a first state communicating with the first channel and a second state communicating with the second channel.

[0011] Preferably, the gas distribution rod is specifically made of nylon material, a first mounting hole is arranged at the rear end of the piston, and the gas distribution rod and the first mounting hole are in interference fit.

[0012] Preferably, an inwardly concave mounting groove is arranged on the inner wall of the first mounting hole, and a convex block is arranged on the outer surface of the gas distribution rod, and the convex block is used to cooperate with the mounting groove.

[0013] Preferably, in the direction from the joint to the drill bit assembly, a sealing section and a gas passing section are sequentially arranged on the outer circumferential surface of the gas distribution rod, and an outlet section is formed at the front end of the joint, wherein,

[0014] When the high-pressure air passage is in the first state, the sealing section cooperates with the outlet section so that the high-pressure air passage communicates with the first channel through the gas distribution channel;

[0015] When the high-pressure air passage is in the second state, the gas passing section cooperates with the outlet section, and there is a gap between the outer surface of the gas passing section and the outlet section for communicating the high-pressure air passage with the second channel.

[0016] Preferably, it further includes:

[0017] Grooves arranged on the outer surface of the sealing section, the grooves are arranged at intervals along the axis of the sealing section, and the length of each groove is not less than the length of the outlet.

[0018] Preferably, the outer diameter of the gas passing section is smaller than the inner diameter of the outlet section, and the length of the gas passing section is greater than the length of the outlet section.

[0019] Preferably, the first channel includes:

[0020] A first air passage arranged in the piston and used to communicate with the gas distribution channel;

[0021] A first arc-shaped groove arranged on the outer circumferential surface of the piston, and the first arc-shaped groove is used to communicate with the front air chamber of the piston;

[0022] A second air passage arranged in the piston and used to connect the first air passage and the first arc-shaped groove.

[0023] Preferably, the second channel includes:

[0024] The first annular groove provided on the inner wall of the outer sleeve;

[0025] The second annular groove provided on the outer surface of the piston for cooperating with the first annular groove. A second arc-shaped groove is further provided on the outer surface of the piston, and the second arc-shaped groove communicates with the second annular groove;

[0026] The third air passage provided at the front end of the piston;

[0027] The fourth air passage provided in the piston for connecting the third air passage and the second arc-shaped groove.

[0028] Preferably, the third air passage and the fourth air passage are perpendicularly arranged, and the second air passage and the first air passage are perpendicularly arranged.

[0029] Preferably, it further includes:

[0030] The third annular groove provided on the inner surface of the outer sleeve.

[0031] Preferably, the drill bit assembly includes:

[0032] The chuck sleeve fixedly connected to the front end of the outer sleeve;

[0033] The drill bit sleeved in the chuck sleeve and connected to the chuck sleeve by a spline. An exhaust passage is provided in the drill bit;

[0034] The snap ring fixedly provided on the inner wall of the outer sleeve. A positioning boss for cooperating with the snap ring for limiting is provided at the rear end of the drill bit.

[0035] Preferably, the drill bit assembly further includes:

[0036] The tail pipe fixedly connected to the rear end of the drill bit and communicating with the exhaust passage. The tail pipe is slidably connected to the piston. The tail pipe has a first exhaust state communicating with the second passage and a second exhaust state communicating with the front air chamber. The piston moves along the axis direction of the outer sleeve to switch between the first exhaust state and the second exhaust state.

[0037] Preferably, it further includes:

[0038] The check valve assembly fixedly provided in the joint for opening and closing the high-pressure air passage.

[0039] Preferably, the check valve assembly includes:

[0040] The air distribution seat provided in the high-pressure air passage. The air distribution seat is used for separating the high-pressure air passage into a first air chamber and a second air chamber. An opening for communicating the first air chamber and the second air chamber is provided on the air distribution seat;

[0041] A rubber plug fixedly arranged on the inner wall at the rear end of the joint, and a channel is arranged in the rubber plug;

[0042] A check valve arranged at the rear end of the air distribution seat, and the check valve is used to open and close the channel;

[0043] An elastic member arranged between the check valve and the air distribution seat, and the elastic member can generate elastic deformation so that the check valve is separated from the rubber plug.

[0044] Preferably, the check valve assembly further includes:

[0045] A plugging rod arranged at the front end of the air distribution seat, and the plugging rod is used to insert into the air distribution channel so that the high-pressure air passage is communicated with the rear air chamber.

[0046] Preferably, the check valve assembly further includes:

[0047] A guide sleeve arranged at the rear end of the air distribution seat, a receiving cavity is arranged in the guide sleeve, and the front end of the elastic member abuts against the bottom surface of the receiving cavity;

[0048] The check valve is sleeved on the outside of the guide sleeve, and a guide groove for cooperating with the rear end of the elastic member is further arranged in the check valve.

[0049] Preferably, it further includes:

[0050] A receiving groove arranged on the inner wall of the joint, and the receiving groove is used to place the rubber plug. The inner diameter of the receiving groove is smaller than the outer diameter of the rubber plug and smaller than the inner diameter of the rubber plug.

[0051] The down-the-hole hammer provided by the utility model firstly has an outer sleeve, a drill bit assembly, a joint and a piston. Among them, the front end of the outer sleeve is connected to the drill bit assembly, and the rear end of the outer sleeve is connected to the joint. A high-pressure air passage is arranged in the joint, and an exhaust passage is arranged in the drill bit assembly. The piston is movably arranged in the outer sleeve. A front chamber is formed between the piston, the outer sleeve and the drill bit assembly, and a rear chamber is formed between the piston, the outer sleeve and the joint. A first passage and a second passage are also formed between the piston and the outer sleeve. Among them, the first passage is used to communicate with the front air chamber, and the second passage is used to communicate with the rear air chamber. High-pressure air enters the outer sleeve through the high-pressure air passage, so that there is a pressure difference between the front air chamber and the rear air chamber, and the piston is pushed to reciprocate along the axis of the outer sleeve. By hitting the drill bit assembly with the piston, a pulsed force is provided for the drill bit assembly to drill holes. Secondly, a joint air distribution rod is also provided. Among them, the air distribution rod is detachably arranged at the rear end of the piston, and an air distribution passage is arranged in the air distribution rod. The air distribution rod is used to cooperate with the joint so that the high-pressure air passage has a first state and a second state. Among them, when the high-pressure air passage is in the first state, the high-pressure air passage is communicated with the first passage, and when the high-pressure air passage is in the second state, the high-pressure air passage is communicated with the second passage. On the one hand, the air distribution rod in the prior art is used in cooperation with the air distribution seat, while the air distribution rod in this application is used in cooperation with the joint, which can shorten the overall length of the down-the-hole hammer. On the other hand, the air distribution rod and the piston are detachably connected, and the joint and the air distribution rod are used in cooperation. If the air distribution rod is worn, the air distribution rod can be replaced in time to avoid affecting the performance of the hammer. It can be seen that, compared with the prior art, the down-the-hole hammer in the embodiment of the utility model can avoid abrasion and wear between the air distribution seat and the piston, and improve the service life of the down-the-hole hammer. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0053] Figure 1 is a schematic structural diagram of a down-the-hole hammer provided by an embodiment of the present utility model;

[0054] Figure 2 is Figure 1 a partial enlarged view of the piston in

[0055] Figure 3 is a schematic structural diagram of a piston provided by an embodiment of the present utility model;

[0056] Figure 4 isFigure 1 Partial enlarged view of the middle joint part;

[0057] Figure 5 is Figure 1 Partial enlarged view of the middle drill bit assembly;

[0058] Figure 6 Schematic diagram of a structure of the down-the-hole hammer provided by an embodiment of the present utility model in the first state;

[0059] Figure 7 Schematic diagram of a structure of the down-the-hole hammer provided by an embodiment of the present utility model in the second state;

[0060] Figure 8 Schematic diagram of a structure of the down-the-hole hammer provided by an embodiment of the present utility model in the third state;

[0061] Figure 9 Schematic diagram of a structure of the down-the-hole hammer provided by an embodiment of the present utility model in the fourth state;

[0062] Figure 10 Schematic diagram of a structure of the down-the-hole hammer provided by an embodiment of the present utility model in the drill-lifting state.

[0063] Reference numerals: 1, outer sleeve; 2, drill bit assembly; 3, joint; 4, piston; 5, air distribution rod; 31, high-pressure air passage; 32, outlet section; 41, first mounting hole; 51, air distribution channel; 52, plugging section; 53, air passage section; 61, first air passage; 62, first arc-shaped groove; 63, second air passage; 71, first ring groove; 72, second ring groove; 73, second arc-shaped groove; 74, third air passage; 75, fourth air passage; 11, third ring groove; 21, drill chuck sleeve; 22, drill bit; 23, exhaust passage; 24, snap ring; 25, positioning boss; 26, tail pipe; 81, air distribution seat; 82, rubber plug; 83, check valve; 84, elastic member; 85, plugging rod. Detailed implementation manners

[0064] 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 will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0065] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly disposed 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.

[0066] It should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying 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 construed as a limitation to the present application.

[0067] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meanings of "a plurality of" and "several" are two or more, unless otherwise specifically defined.

[0068] It should be noted that the structures, proportions, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the implementation conditions of the present application. Therefore, they do not have any technical essence. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present application can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present application.

[0069] The embodiments of the present utility model are written in a progressive manner.

[0070] As Figures 1 to 5 shown, the embodiments of the present utility model provide a down-the-hole hammer, including: an outer sleeve 1, the front end of the outer sleeve 1 is connected to a drill bit assembly 2, the rear end of the outer sleeve 1 is connected to a joint 3, and a high-pressure air passage 31 is provided inside the joint 3; a piston 4 movably disposed inside the outer sleeve 1, a front air chamber is formed between the piston 4, the outer sleeve 1 and the drill bit assembly 2, a rear air chamber is formed between the piston 4, the joint 3 and the outer sleeve 1, a first passage communicating with the front air chamber and a second passage communicating with the rear air chamber are formed between the piston 4 and the outer sleeve 1; a gas distribution rod 5 detachably disposed at the rear end of the piston 4, a gas distribution passage 51 is provided inside the gas distribution rod 5, and the gas distribution rod 5 is used to cooperate with the joint 3 so that the high-pressure air passage 31 has a first state communicating with the first passage and a second state communicating with the second passage.

[0071] In the prior art, the impactor uses the air distribution seat 81 and the piston 4 to cooperate for air distribution. However, at present, both the air distribution seat 81 and the piston 4 are made of rigid materials. Under the continuous high-frequency impact, the inner wall of the piston 4 often shows abrasion or wear, increasing the gap between the piston 4 and the air distribution seat 81, affecting the performance of the impactor, resulting in a large air consumption of the impactor, weak impact force, and slow working efficiency.

[0072] The down-the-hole impactor provided by the present utility model first has an outer sleeve 1, a drill bit assembly 2, a joint 3, and a piston 4. Among them, the front end of the outer sleeve 1 is connected to the drill bit assembly 2, and the rear end of the outer sleeve 1 is connected to the joint 3. A high-pressure air passage 31 is provided in the joint 3, and an exhaust passage 23 is provided in the drill bit assembly 2. The piston 4 is movably arranged in the outer sleeve 1. A front chamber is formed among the piston 4, the outer sleeve 1, and the drill bit assembly 2, and a rear chamber is formed among the piston 4, the outer sleeve 1, and the joint 3. A first passage and a second passage are also formed between the piston 4 and the outer sleeve 1. Among them, the first passage is used to communicate with the front air chamber, and the second passage is used to communicate with the rear air chamber. High-pressure air enters the outer sleeve 1 through the high-pressure air passage 31, creating an air pressure difference between the front air chamber and the rear air chamber, pushing the piston 4 to reciprocate along the axis of the outer sleeve 1, and hitting the drill bit assembly 2 through the piston 4 to provide a pulsed force for the drill bit assembly 2 to drill holes. Secondly, a joint 3 and a gas distribution rod 5 are also provided. Among them, the gas distribution rod 5 is detachably arranged at the rear end of the piston 4, and a gas distribution passage 51 is provided in the gas distribution rod 5. The gas distribution rod 5 is used to cooperate with the joint 3 so that the high-pressure air passage 31 has a first state and a second state. Among them, when the high-pressure air passage 31 is in the first state, the high-pressure air passage 31 is communicated with the first passage, and when the high-pressure air passage 31 is in the second state, the high-pressure air passage 31 is communicated with the second passage. On the one hand, the gas distribution rod 5 in the prior art is used in cooperation with the air distribution seat 81, while the gas distribution rod 5 in this application is used in cooperation with the joint 3, which can shorten the overall length of the down-the-hole impactor; on the other hand, the gas distribution rod 5 and the piston 4 are detachably connected, and the joint 3 and the gas distribution rod 5 are used in cooperation. If the gas distribution rod 5 is worn, the gas distribution rod 5 can be replaced in time to avoid affecting the performance of the impactor. It can be seen that compared with the prior art, the down-the-hole impactor in the embodiment of the present utility model can avoid abrasion and wear between the air distribution seat 81 and the piston 4, and improve the service life of the down-the-hole impactor.

[0073] In the prior art, the piston 4 in the down-the-hole hammer cooperates with the air distribution seat 81 for air distribution. The air distribution seat 81 is arranged inside the outer casing 1, and the required length of the outer casing 1 is greater. In the present application, the air distribution rod 5 is detachably connected to the piston 4, and the air distribution is carried out by the cooperation of the air distribution rod 5 and the joint 3, which will not cause wear of the piston 4. On the other hand, due to the detachable connection between the air distribution rod 5 and the piston 4, if the air distribution rod 5 is worn, the air distribution rod 5 can be replaced, so as to avoid affecting the service life of the hammer.

[0074] Further, as one of the implementation manners, the air distribution rod 5 in the embodiment of the present utility model is specifically made of nylon material. A first installation hole 41 is arranged at the rear end of the piston 4, and the air distribution rod 5 is in interference fit with the first installation hole.

[0075] Specifically, the air distribution rod 5 is made of nylon material, which reduces the wear between the air distribution rod 5 and the joint 3 and improves the service life of the air distribution rod 5 and the joint 3. In addition, for the interference fit connection relationship between the air distribution rod 5 and the first installation hole on the piston 4, if the air distribution rod 5 needs to be replaced, by applying a pulling force to the air distribution rod 5, the air distribution rod 5 can generate a certain elastic deformation, so as to be removed from the piston 4. When installation is required, pressure can be applied to the air distribution rod 5 in advance to make the air distribution rod 5 deformed, so as to be installed in the first installation hole. Or the piston 4 can be heated to make the first installation hole larger, so as to install the air distribution rod 5 in the first installation hole.

[0076] In the above structure, in order to prevent the air distribution rod 5 from disengaging from the first installation hole of the piston 4 during the air distribution process of the cooperation between the air distribution rod 5 and the joint 3, as one of the implementation manners, an installation groove is arranged on the inner wall of the first installation hole in the embodiment of the present utility model. The installation groove is recessed inward from the inner wall of the first installation hole, and a convex block is arranged on the outer surface of the air distribution rod 5 for cooperating with the installation groove.

[0077] Specifically, when the air distribution rod 5 is installed in the piston 4, the convex block cooperates with the installation groove, and the axial position of the convex block is limited and constrained by the installation groove to prevent the air distribution rod 5 from disengaging from the piston 4.

[0078] In the above structure, the air distribution rod 5 cooperates with the inner wall of the front end of the joint 3 for air distribution. From the joint 3 to the direction of the drill bit assembly 2, a plugging section 52 and a gas passing section 53 are sequentially arranged on the outer circumferential surface of the air distribution rod 5, and an outlet section 32 is formed on the inner wall of the front end of the joint 3; when the high-pressure air passage 31 is in the first state, the plugging section 52 cooperates with the outlet section 32 to enable the high-pressure air passage 31 to be communicated with the first passage through the air distribution passage 51; when the high-pressure air passage 31 is in the second state, the gas passing section 53 cooperates with the outlet section 32, and there is a gap between the outer surface of the gas passing section 53 and the outlet section 32 for communicating the high-pressure air passage 31 with the second passage.

[0079] Specifically, as the piston 4 moves axially along the outer sleeve 1, when the air distribution rod 5 moves to the position where the blocking section 52 cooperates with the outlet section 32, at this time, the high-pressure air passage 31 is in the first state. The high-pressure air passage 31 is connected to the first passage through the air distribution passage 51. The high-pressure gas in the high-pressure air passage 31 flows through the air distribution passage 51 and the first passage into the front air chamber, thereby realizing pressurization of the front air chamber. When the air distribution rod 5 continues to move in the direction of the joint 3, the air passage section 53 of the air distribution rod 5 cooperates with the outlet section 32, and there is a gap between the outer surface of the air passage section 53 and the outlet section 32. The high-pressure air passage 31 enters the rear air chamber through the gap, thereby realizing pressurization of the rear air chamber.

[0080] In the above structure, the blocking section 52 of the air distribution rod 5 cooperates with the outlet section 32 of the joint 3. In order to further increase the toughness of the blocking section 52, as one of the implementation manners, the down-the-hole hammer in the embodiment of the present invention further includes grooves. The grooves are arranged on the outer surface of the blocking section 52 and are spaced along the axial direction of the blocking section 52. The length of the grooves is not greater than the length of the outlet section 32. By providing grooves on the outer surface of the blocking section 52, the toughness of the blocking section 52 can be increased, and the frictional wear between the blocking section 52 and the inner wall of the outlet section 32 of the joint 3 can be reduced.

[0081] In the above structure, as one of the implementation manners, the outer diameter of the air passage section 53 in the embodiment of the present invention is smaller than the inner diameter of the outlet section 32, and the length of the air passage section 53 is greater than the length of the outlet section 32. The air passage section 53 is used to cooperate with the outlet section 32 of the joint 3, and a gap is formed between the outer circumferential surface of the air passage section 53 and the inner wall of the outlet section 32. The high-pressure gas enters the rear air chamber through the gap between the air passage section 53 and the outlet section 32.

[0082] In the above structure, as one of the implementation manners, the first passage in the embodiment of the present invention includes a first air passage 61, a first arc-shaped groove 62, and a second air passage 63. Among them, the first air passage 61 is arranged in the piston 4 and is used to communicate with the air distribution passage 51. The first arc-shaped groove 62 is arranged on the outer circumferential surface of the piston 4 and is used to communicate with the front air chamber of the piston 4. The second air passage 63 is arranged in the piston 4 and is used to connect the first air passage 61 and the first arc-shaped groove 62.

[0083] Specifically, when the high-pressure air passage 31 is connected to the first passage, the high-pressure gas in the high-pressure air passage 31 sequentially passes through the air distribution passage 51, the first air passage 61, the second air passage 63, and the first arc-shaped groove 62 and enters the front air chamber to pressurize the front air chamber. When the air pressure in the front air chamber is greater than the air pressure in the rear air chamber, the piston 4 is pushed to move in the direction of the joint 3.

[0084] In the above structure, as one of the embodiments, the second channel in the embodiment of the present utility model includes: a first annular groove 71 provided on the inner wall of the outer sleeve 1; a second annular groove 72 provided on the outer surface of the piston 4 for cooperating with the first annular groove 71. A second arc-shaped groove 73 is further provided on the outer surface of the piston 4, and the second arc-shaped groove 73 communicates with the second annular groove 72; a third air passage 74 provided at the front end of the piston 4; a fourth air passage 75 provided in the piston 4 for connecting the third air passage 74 and the second arc-shaped groove 73.

[0085] Specifically, when the piston 4 moves to a position where the rear air chamber communicates with the first annular groove 71, the high-pressure gas in the rear air chamber can enter the third air passage 74 through the first annular groove 71, the second annular groove 72, the second arc-shaped groove 73, and the fourth air passage 75, and is subsequently discharged from the inside of the impactor.

[0086] Furthermore, both the first arc-shaped groove 62 and the second arc-shaped groove 73 are provided on the outer surface of the piston 4, which can form a larger accommodation space with the inner wall of the outer sleeve 1 for storing high-pressure gas. And the radian of the second arc-shaped groove 73 is greater than that of the second annular groove 72.

[0087] Even further, the third air passage 74 and the fourth air passage 75 in the embodiment of the present utility model are perpendicularly arranged, and the second air passage 63 is perpendicularly arranged with the first air passage 61. In this way, the processing of the piston 4 is simpler.

[0088] In the above structure, as one of the embodiments, the down-the-hole impactor in the embodiment of the present utility model further includes a third annular groove 11. The third annular groove 11 is provided on the inner surface of the outer sleeve 1, and the third annular groove 11 is used for slag blowing when the down-the-hole impactor is pulled out of the hole.

[0089] In the above structure, as Figure 5 shown, the drill bit assembly 2 in the embodiment of the present utility model includes a chuck sleeve 21, a drill bit 22, a snap ring 24, and a positioning boss 25. Among them, the chuck sleeve 21 is fixedly connected to the front end of the outer sleeve 1. The drill bit 22 is sleeved in the chuck sleeve 21, and the drill bit 22 and the chuck sleeve 21 are connected by splines. An exhaust passage 23 is provided in the drill bit 22, and the exhaust passage 23 alternately communicates with the front air chamber and the rear air chamber for discharging the high-pressure gas inside the down-the-hole impactor and for slag blowing. A snap ring 24 is fixedly provided on the inner wall of the outer sleeve 1, and a positioning boss 25 for cooperating with the snap ring 24 for limiting is provided at the rear end of the drill bit 22.

[0090] Further, as one of the implementation manners, the drill bit assembly 2 in the embodiment of the present utility model further includes a tail pipe 26. The tail pipe 26 is fixedly connected to the rear end of the drill bit 22, and the tail pipe 26 is communicated with the exhaust passage 23. The tail pipe 26 is slidably connected to the piston 4, so that the tail pipe 26 has a first exhaust state and a second exhaust state. When the tail pipe 26 is in the first exhaust state, the tail pipe 26 is communicated with the second passage. When the tail pipe 26 is in the second exhaust state, the tail pipe 26 is communicated with the front air chamber. The piston 4 moves along the axis direction of the outer sleeve 1 to switch between the first exhaust state and the second exhaust state.

[0091] Further, the tail pipe 26 in the embodiment of the present utility model is specifically made of nylon material, which will not cause wear on the inner wall of the piston 4 and increases the service life of the piston 4.

[0092] Further, as one of the implementation manners, as Figure 4 shown, the down-the-hole hammer in the embodiment of the present utility model further includes a check valve assembly. The check valve assembly is arranged in the joint 3, and the check valve assembly is used to open and close the high-pressure air passage 31. By arranging the check valve assembly in the joint 3, the length of the outer sleeve 1 is reduced.

[0093] Further, as one of the implementation manners, the check valve assembly in the embodiment of the present utility model includes:

[0094] A gas distribution seat 81 arranged in the high-pressure air passage 31. The gas distribution seat 81 is used to divide the high-pressure air passage 31 into a first air chamber and a second air chamber. A through hole for communicating the first air chamber and the second air chamber is arranged on the gas distribution seat 81; a rubber plug 82 fixedly arranged on the inner wall of the rear end of the joint 3. A passage is arranged in the rubber plug 82; a check valve 83 arranged at the rear end of the gas distribution seat 81. The check valve 83 is used to open and close the passage; an elastic member 84 arranged between the check valve 83 and the gas distribution seat 81. The elastic member 84 can generate elastic deformation so that the check valve 83 is separated from the rubber plug 82. The high-pressure gas in the high-pressure air passage 31 pushes open the check valve 83 and sequentially enters the first air chamber and the second air chamber through the passage in the rubber plug 82. The high-pressure gas in the second air chamber enters the air distribution passage 51 or the rear air chamber.

[0095] Further, the check valve 83 is used to open and close the passage in the rubber plug 82. In the direction towards the drill bit 22, the inner diameter of the passage at the front end of the rubber screen gradually increases. A forming surface for cooperating with the rubber screen is arranged on the check valve 83. When the supply of high-pressure gas stops, under the action of the elastic reset deformation of the elastic member 84, the forming surface on the check valve 83 is pushed to fit with the inner wall of the rubber screen, thereby closing the high-pressure passage. Since the rubber screen is made of elastic material, the phenomenon that the high-pressure air passage 31 is not tightly closed can be avoided.

[0096] Further, as one of the implementation manners, the elastic member 84 in the embodiment of the present utility model is preferably a spring.

[0097] In the above structure, as one of the implementation manners, the check valve assembly in the embodiment of the present utility model further includes a plugging rod 85. Wherein, the plugging rod 85 is arranged at the front end of the air distribution seat 81, and the plugging rod 85 is used to insert into the air distribution rod 5 for isolating the air distribution channel 51 and the high-pressure air duct 31. When the piston 4 moves to the air passing section 53 to cooperate with the outlet section 32 of the joint 3, the plugging rod 85 is inserted into the air distribution channel 51, and the high-pressure gas in the high-pressure air duct 31 can only enter the rear chamber through the gap between the air passing section 53 and the outlet section 32.

[0098] In the above structure, as one of the implementation manners, the check valve assembly in the embodiment of the present utility model further includes: a guide sleeve arranged at the rear end of the air distribution seat 81, a receiving cavity is arranged inside the guide sleeve, and the front end of the elastic member 84 abuts against the bottom surface of the receiving cavity; the check valve 83 is sleeved outside the guide sleeve, and a guide groove for cooperating with the rear end of the elastic member 84 is further arranged inside the check valve 83. On the one hand, the outer wall of the guide sleeve guides the check valve 83, and the inner wall of the receiving cavity of the guide sleeve guides the front part of the elastic member 84. On the other hand, the guide groove inside the check valve 83 guides the rear part of the elastic member 84 to prevent the check valve 83 from shifting during the movement process.

[0099] Further, as one of the implementation manners, the down-the-hole hammer in the embodiment of the present utility model further includes a receiving groove, the receiving groove is arranged on the inner wall of the joint 3, and the receiving groove is used for placing the rubber plug 82. The inner diameter of the receiving groove is smaller than the outer diameter of the rubber plug 82 and smaller than the inner diameter of the rubber plug 82. The rubber plug 82 is installed in the receiving groove to position the check valve 83.

[0100] The working process of the hammer will be described below.

[0101] In the first state, as Figure 6 shown, the plugging section 52 of the air distribution rod 5 cooperates with the outlet section 32 of the joint 3 to isolate the high-pressure air duct 31 from the rear chamber. At this time, the air distribution rod 5 is separated from the plugging rod 85, and the high-pressure gas enters the front air chamber through the air distribution channel 51 and the first channel. The air pressure in the front air chamber increases, and the piston 4 is pushed to move towards the joint 3.

[0102] In the second state, as Figure 7As shown, high-pressure gas continuously enters the front air chamber through the ligand rod and the first channel, increasing the air pressure in the front air chamber, as indicated by the solid arrow; the gas in the rear air chamber enters the second arc-shaped groove 73 through the first annular groove 71 and the second annular groove 72, and then enters the third air passage 74 through the fourth air passage 75. At this time, the tail pipe 26 on the drill bit 22 is inserted at the front end of the piston 4, and the high-pressure gas in the third air passage 74 is discharged through the tail rod and the exhaust passage 23, pushing the piston to move towards the joint, as indicated by the hollow arrow.

[0103] As the piston 4 moves towards the joint 3, the down-the-hole hammer enters the third state, as Figure 8 shown. At this time, the gas passage section 53 on the air distribution rod 5 cooperates with the outlet section 32. At this time, the plugging rod 85 is inserted into the air distribution channel 51, and the gas in the high-pressure air passage 31 directly enters the rear chamber through the gap between the gas passage section 53 and the outlet section 32, increasing the air pressure in the rear chamber. However, under the action of inertia, the piston 4 continues to move towards the joint 3.

[0104] As the piston 4 continues to move towards the joint 3, the down-the-hole hammer enters the fourth state, as Figure 9 shown, that is, the tail pipe 26 is separated from the piston 4, and the gas in the front chamber directly enters the exhaust passage 23 through the tail pipe 26 for exhaust. As the air pressure in the front air chamber decreases, the air pressure difference between the front air chamber and the rear air chamber pushes the piston 4 to move reversely towards the drill bit 22.

[0105] As the piston 4 moves towards the drill bit 22, the front end of the piston 4 contacts the drill bit 22 and enters the first state.

[0106] As Figure 10 shown, when the down-the-hole hammer is in the state of lifting the drill, the front end of the drill bit 22 no longer abuts against the bottom of the drill hole. Under the action of gravity, the positioning boss 25 on the drill bit 22 abuts against the snap ring 24, the piston 4 abuts against the rear end of the drill bit 22, and the air distribution rod 5 is separated from the outlet section 32 of the joint 3. At this time, the rear air chamber is separated from the exhaust passage 23, and the high-pressure gas enters the first arc-shaped groove 62 through the air distribution channel 51 of the air distribution rod 5, the first air passage 61, and the second air passage 63. At this time, the first arc-shaped groove 62 is isolated from the front air chamber, and the first arc-shaped groove 62 is communicated with the third annular groove 11, and the first annular groove 71 is communicated with the second arc-shaped groove 73, so as to be finally discharged through the second arc-shaped groove 73, the fourth air passage 75, the third air passage 74, and finally the exhaust passage 23, so as to perform slag blowing.

[0107] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to the embodiments shown herein, but rather will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A down-the-hole hammer, characterized in that, Comprising: An outer sleeve (1), the front end of the outer sleeve (1) is connected to a drill bit assembly (2), the rear end of the outer sleeve (1) is connected to a joint (3), and a high-pressure air passage (31) is provided inside the joint (3); A piston (4) movably arranged inside the outer sleeve (1), a front air chamber is formed between the piston (4), the outer sleeve (1) and the drill bit assembly (2), a rear air chamber is formed between the piston (4), the joint (3) and the outer sleeve (1), and a first passage for communicating with the front air chamber and a second passage for communicating with the rear air chamber are formed between the piston (4) and the outer sleeve (1); An air distribution rod (5) detachably arranged at the rear end of the piston (4), an air distribution passage (51) is provided inside the air distribution rod (5), and the air distribution rod (5) is used in cooperation with the joint (3) so that the high-pressure air passage (31) has a first state of communicating with the first passage and a second state of communicating with the second passage.

2. The down-the-hole hammer according to claim 1, characterized in that The air distribution rod (5) is specifically made of nylon material, a first mounting hole (41) is provided at the rear end of the piston (4), and the air distribution rod (5) is in interference fit with the first mounting hole (41).

3. The down-the-hole hammer according to claim 2, characterized in that An inwardly concave mounting groove is provided on the inner wall of the first mounting hole (41), and a convex block is provided on the outer surface of the air distribution rod (5), and the convex block is used in cooperation with the mounting groove.

4. The down-the-hole hammer according to claim 1, characterized in that In the direction from the joint (3) to the drill bit assembly (2), a sealing section (52) and a gas passage section (53) are sequentially provided on the outer circumferential surface of the air distribution rod (5), and an outlet section (32) is formed at the front end of the joint. Among them, When the high-pressure air passage (31) is in the first state, the sealing section (52) cooperates with the outlet section (32) so that the high-pressure air passage (31) communicates with the first passage through the air distribution passage (51); When the high-pressure air passage (31) is in the second state, the gas passage section (53) cooperates with the outlet section (32), and there is a gap between the outer surface of the gas passage section (53) and the outlet section (32) for communicating the high-pressure air passage with the second passage.

5. The down-the-hole hammer according to claim 4, characterized in that Further comprising: Grooves provided on the outer surface of the sealing section (52), the grooves are arranged at intervals along the axial direction of the sealing section (52), and the lengths of the grooves are not less than the length of the outlet.

6. The down-the-hole hammer according to claim 4, characterized in that The outer diameter of the gas passage section (53) is smaller than the inner diameter of the outlet section (32), and the length of the gas passage section (53) is greater than the length of the outlet section (32).

7. The down-the-hole hammer according to any one of claims 1 to 6, characterized in that The first passage includes: A first air passage (61) disposed within the piston (4) and adapted to communicate with the gas distribution passage (51); A first arc-shaped groove (62) disposed on the outer circumferential surface of the piston (4), the first arc-shaped groove (62) being adapted to communicate with the front air chamber; A second air passage (63) disposed within the piston (4) and adapted to connect the first air passage (61) and the first arc-shaped groove (62).

8. The down-the-hole hammer according to claim 7, characterized in that The second passage includes: A first annular groove (71) disposed on the inner wall of the outer sleeve (1); A second annular groove (72) disposed on the outer surface of the piston (4) and adapted to cooperate with the first annular groove (71), and a second arc-shaped groove (73) is further disposed on the outer surface of the piston, the second arc-shaped groove (73) communicating with the second annular groove (72); A third air passage (74) disposed at the front end of the piston (4); A fourth air passage (75) disposed within the piston (4) and adapted to connect the third air passage (74) and the second arc-shaped groove (73).

9. The down-the-hole hammer according to claim 8, characterized in that The third air passage (74) is disposed perpendicular to the fourth air passage (75), and the second air passage (63) is disposed perpendicular to the first air passage (61).

10. The down-the-hole hammer according to claim 7, characterized in that It further includes: A third annular groove (11) disposed on the inner surface of the outer sleeve (1).

11. The down-the-hole hammer according to claim 1, characterized in that The drill bit assembly (2) includes: A chuck sleeve (21) fixedly connected to the front end of the outer sleeve (1); A drill bit (22) sleeved within the chuck sleeve (21) and connected to the chuck sleeve (21) by splines, and an exhaust passage (23) is disposed within the drill bit; A snap ring (24) fixedly disposed on the inner wall of the outer sleeve (1), and a positioning boss (25) adapted to cooperate with the snap ring (24) for limiting is disposed at the rear end of the drill bit (22).

12. The down-the-hole hammer according to claim 11, characterized in that The drill bit assembly further includes: A tail pipe (26) fixedly connected to the rear end of the drill bit (22) and communicating with the exhaust passage (23), the tail pipe (26) being slidably connected to the piston (4), the tail pipe (26) having a first exhaust state communicating with the second passage and a second exhaust state communicating with the front air chamber, and the piston (4) moves along the axis of the outer sleeve (1) to switch between the first exhaust state and the second exhaust state.

13. The down-the-hole hammer according to claim 1, characterized in that It further includes: A check valve assembly fixedly disposed within the joint (3) and adapted to open and close the high-pressure air passage (31).

14. The down-the-hole hammer according to claim 13, characterized in that The check valve assembly includes: A gas distribution seat (81) disposed in the high-pressure air passage (31), the gas distribution seat (81) being configured to divide the high-pressure air passage into a first air chamber and a second air chamber, and a through port for communicating the first air chamber and the second air chamber being provided on the gas distribution seat (81); A rubber plug (82) fixedly disposed on the inner wall at the rear end of the joint (3), a passage being provided in the rubber plug (82); A check valve (83) disposed at the rear end of the gas distribution seat (81), the check valve (83) being configured to open and close the passage; An elastic member (84) disposed between the check valve (83) and the gas distribution seat (81), the elastic member (84) being capable of elastic deformation so that the check valve (83) is separated from the rubber plug (82).

15. The down-the-hole hammer according to claim 14, wherein The check valve assembly further includes: A plugging rod (85) disposed at the front end of the gas distribution seat (81), the plugging rod (85) being configured to insert into the gas distribution passage (51) so that the high-pressure air passage (31) communicates with the rear air chamber.

16. The down-the-hole hammer according to claim 14, wherein The check valve assembly further includes: A guide sleeve disposed at the rear end of the gas distribution seat (81), a receiving cavity being provided in the guide sleeve, and the front end of the elastic member (84) abutting against the bottom surface of the receiving cavity; The check valve (83) is sleeved outside the guide sleeve, and a guide groove for cooperating with the rear end of the elastic member (84) is further provided in the check valve (83).

17. The down-the-hole hammer according to claim 14, wherein Further included is: A receiving groove disposed on the inner wall of the joint (3), the receiving groove being configured to place the rubber plug (82), and the inner diameter of the receiving groove being smaller than the outer diameter of the rubber plug (82) and smaller than the inner diameter of the rubber plug (82).

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