Down-hole hammer

Abstract

The down-the-hole hammer comprises an outer sleeve, the two ends of the outer sleeve are connected with a connector and a drill bit assembly respectively, a high-pressure air channel is formed in the connector, and a slag blowing channel is formed in the drill bit assembly; the gas distribution seat is arranged in the outer sleeve, and a gas distribution seat gas channel is formed in the axial direction of the gas distribution seat; the piston is movably arranged in the outer sleeve, a center channel is formed in the piston, and the two ends of the center channel are communicated with the gas distribution seat gas channel and the slag blowing channel respectively; the check valve assembly is arranged at the rear end of the gas distribution seat and used for opening and closing the high-pressure gas channel, a high-pressure gas chamber is formed among the check valve assembly, the connector and the outer sleeve, and a check valve gas channel used for communicating the high-pressure gas chamber with the gas distribution seat gas channel is arranged in the check valve assembly. Compared with the prior art, the down-hole hammer has the advantages that the deslagging effect can be improved, and the drilling speed can be increased.

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] Pneumatic down-the-hole hammers utilize high-pressure air as their power source, driving the piston within the hammer to reciprocate at high speed and frequency, generating sufficient energy to impact the drill bit and perform the drilling operation. The impact force acts as a stress wave on the drill bit, generating enormous impact energy in a very short period of time, effectively breaking the rock and quickly forming a hole, achieving the purpose of rock drilling.

[0003] Down-the-hole impactors are widely used in drilling water wells and blasting holes. As drilling deepens, the rock formations at the bottom of the hole become more variable, often accompanied by complex working conditions such as mud and water mixing. During the drilling process, a large amount of water, mud and rock debris will be present in the hole. When there is too much mud and debris, a large amount of water or the hole is deep, the down-the-hole impactor has a poor slag removal effect and cannot discharge the rock debris at the bottom of the hole in time, affecting drilling efficiency.

[0004] Therefore, there is an urgent need for a down-the-hole impactor that can improve the slag removal effect and increase the drilling speed. Utility Model Content

[0005] In order to solve the above technical problems, the present application provides a down-the-hole impactor that can improve the slag removal effect and increase the drilling speed.

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

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

[0008] An outer sleeve, wherein both ends of the outer sleeve are connected to a joint and a drill bit assembly respectively, a high-pressure air passage is provided in the joint, and a slag blowing passage is provided in the drill bit assembly;

[0009] A gas distribution seat is arranged in the outer sleeve, and a gas distribution seat air passage is arranged along the axial direction of the gas distribution seat;

[0010] a piston movably disposed in the outer sleeve, wherein a central channel is disposed in the piston, and two ends of the central channel are respectively connected to the gas distribution seat air channel and the slag blowing channel;

[0011] A check valve assembly is provided at the rear end of the valve seat for opening and closing the high-pressure air passage. A high-pressure air chamber is formed between the check valve assembly, the joint and the outer sleeve. A check valve air passage is provided in the check valve assembly for connecting the high-pressure air chamber and the valve seat air passage.

[0012] Preferably, the check valve assembly comprises:

[0013] a valve stem, the valve stem comprising a connected blocking section and a guide section, the blocking section being provided with a blocking surface at a rear end away from the guide section, the blocking surface having a first state in contact with the high-pressure airway and a second state separated from the high-pressure airway;

[0014] An accommodating groove provided on the gas distribution seat and used for connecting the check valve airway and the gas distribution seat airway, the accommodating groove being used for sliding connection with the guide section;

[0015] The first elastic member has two ends connected to the bottom surface of the accommodating groove and the valve stem respectively, and the first elastic member generates elastic reset deformation for switching between the second state and the first state.

[0016] Preferably, the check valve airway comprises:

[0017] a first channel provided in the guide section, the first channel extending along the axial direction of the guide section, the first channel being communicated with the accommodating groove;

[0018] A second channel is provided along the radial direction of the guide section, wherein the second channel is used to connect the first channel and the high-pressure gas chamber.

[0019] Preferably, at least two second channels are provided, and the second channels are arranged at intervals in the circumferential direction around the guide segment.

[0020] Preferably, the second channel is provided at one end of the guide section close to the blocking section, and the aperture of the second channel is specifically 1 mm to 20 mm.

[0021] Preferably, the check valve assembly further includes:

[0022] A second elastic member is sleeved on the outer side of the guide section, and two ends of the second elastic member are respectively in contact with the rear end surface of the gas distribution seat and the front end surface of the blocking section.

[0023] Preferably, the check valve assembly further includes:

[0024] A guide groove is provided in the guide section, the inner diameter of the accommodating groove is adapted to the outer diameter of the guide section, and the outer diameter of the first elastic member is adapted to the inner diameter of the guide groove.

[0025] Preferably, the check valve assembly further includes:

[0026] A positioning groove is provided at the bottom of the accommodating groove, and the inner diameter of the positioning groove is adapted to the outer diameter of the rear end of the first elastic member.

[0027] Preferably, the first elastic member is a waist-shaped spring, and the diameters of both ends of the first elastic member are larger than the diameter of the middle portion.

[0028] Preferably, the check valve assembly further includes:

[0029] A rubber portion is provided at one end of the blocking section away from the guide section, and is used to cooperate with the hole wall of the high-pressure airway. The rubber portion is fixedly connected to the blocking section, and the outer diameter of the rubber portion gradually increases along the direction from the blocking section to the guide section.

[0030] The down-the-hole impactor provided by the present invention is provided with an outer sleeve, a gas distribution seat, a piston and a check valve assembly, wherein the two ends of the outer sleeve are respectively connected to the joint and the drill bit assembly, a high-pressure airway is provided in the joint, a slag blowing channel is provided in the drill bit assembly, the high-pressure airway is used to send high-pressure gas into the outer sleeve, and the slag blowing channel is used to discharge the waste gas in the outer sleeve, the gas distribution seat is provided in the outer sleeve, a gas distribution seat airway is provided along the axial direction of the gas distribution seat, the piston is movably provided in the outer sleeve, the piston can move in the axial direction of the outer sleeve, a center channel is provided in the piston, and the two ends of the center channel are respectively connected to the gas distribution seat airway and the slag blowing channel. The check valve assembly is provided at the rear end of the gas distribution seat, the check valve assembly is used to open and close the high-pressure airway, a high-pressure air chamber is formed between the check valve assembly, the joint and the outer sleeve, and the check valve assembly is provided with a check valve airway for connecting the high-pressure air chamber and the gas distribution seat airway. When the check valve assembly opens the high-pressure air passage, the high-pressure air passage is connected to the high-pressure air chamber, and the high-pressure gas in the high-pressure air chamber is exhausted through the check valve air passage, the gas distribution seat air passage, the central channel, and the slag blowing passage, and the residue at the bottom of the hole is blown up to improve the slag removal effect, thereby increasing the drilling speed of the hammer. It can be seen that compared with the prior art, the down-the-hole hammer in the embodiment of the present invention is provided with a check valve air passage on the check valve assembly, and the high-pressure air chamber and the gas distribution seat air passage are connected through the check valve air passage. The high-pressure gas can be blown directly through the check valve air passage through the gas distribution seat air passage, the central channel, and the slag blowing passage to the bottom of the hole to achieve slag blowing, thereby improving the slag removal effect and increasing the drilling speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0032] Figure 1 A schematic diagram of the structure of a down-the-hole impactor provided by an embodiment of the present utility model (when the high-pressure airway is closed);

[0033] Figure 2 for Figure 1 A partial enlarged view of the

[0034] Figure 3 A schematic diagram of the structure of a down-the-hole impactor provided by an embodiment of the present utility model (when the high-pressure air channel is open);

[0035] Figure 4 for Figure 3 A partial enlarged view of

[0036] Figure 5 A schematic structural diagram of a valve stem provided in an embodiment of the utility model;

[0037] Figure 6 A schematic structural diagram of the gas distribution seat provided in an embodiment of the utility model.

[0038] Figure numerals: 1. outer sleeve; 2. joint; 3. drill bit assembly; 4. valve seat; 5. piston; 7. high-pressure air chamber; 21. high-pressure air duct; 31. slag blowing channel; 41. valve seat air duct; 42. accommodating groove; 51. center channel; 61. valve stem; 611. sealing section; 612. guide section; 613. sealing surface; 62. first elastic member; 6121. first channel; 6122. second channel; 63. second elastic member; 64. guide groove; 65. positioning groove; 66. rubber part. DETAILED DESCRIPTION

[0039] In order to help those skilled in the art better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of this application.

[0040] 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.

[0041] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout the description of this application, "plurality" or "several" means two or more, unless otherwise specifically defined.

[0043] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the efficacy and purpose that can be achieved by this application.

[0044] The embodiments of the present invention are written in a progressive manner.

[0045] like Figures 1 to 6 As shown, an embodiment of the utility model provides a down-the-hole impactor, comprising: an outer sleeve 1, wherein both ends of the outer sleeve 1 are respectively connected to a joint 2 and a drill bit assembly 3, a high-pressure air passage 21 is provided in the joint 2, and a slag blowing passage 31 is provided in the drill bit assembly 3; a gas distribution seat 4 is provided in the outer sleeve 1, and a gas distribution seat air passage 41 is provided along the axial direction of the gas distribution seat 4; a piston 5 is movably provided in the outer sleeve 1, and a central passage 51 is provided in the piston 5, and both ends of the central passage 51 are respectively connected to the gas distribution seat air passage 41 and the slag blowing passage 31; a check valve assembly is provided at the rear end of the gas distribution seat 4 for opening and closing the high-pressure air passage 21, a high-pressure air chamber 7 is formed between the check valve assembly, the joint 2 and the outer sleeve 1, and a check valve air passage for connecting the high-pressure air chamber 7 and the gas distribution seat air passage 41 is provided in the check valve assembly.

[0046] During the drilling process, current down-the-hole impactors generate a large amount of water, mud, and rock debris in the hole. When there is too much mud and debris, a large amount of water, or the hole is deep, the impactor's deslagging effect is poor, and the rock debris at the bottom of the hole cannot be removed in time, affecting drilling efficiency. Furthermore, if the check valve is not closed in a timely manner, it can easily lead to low pressure inside the down-the-hole impactor and high pressure from the accumulated water outside. This can easily cause mud and debris to flow back into the impactor, causing the piston to jam and stop working, seriously affecting drilling efficiency.

[0047] The down-the-hole impactor provided by the utility model is firstly provided with an outer sleeve 1, a gas distribution seat 4, a piston 5 and a check valve assembly, wherein the two ends of the outer sleeve 1 are respectively connected to the joint 2 and the drill bit assembly 3, a high-pressure air channel 21 is provided in the joint 2, and a slag blowing channel 31 is provided in the drill bit assembly 3. The high-pressure air channel 21 is used to send high-pressure gas into the outer sleeve 1, and the slag blowing channel 31 is used to discharge the exhaust gas in the outer sleeve 1. The gas distribution seat 4 is provided in the outer sleeve 1, and a gas distribution seat air channel 41 is provided along the axial direction of the gas distribution seat 4. The piston 5 is movably provided in the outer sleeve 1, and the piston 5 can move along the axial direction of the outer sleeve 1. A central channel 51 is provided in the piston 5, and the two ends of the central channel 51 are respectively connected with the gas distribution seat air channel 41 and the slag blowing channel 31. The check valve assembly is disposed at the rear end of the gas distribution seat 4. The check valve assembly is used to open and close the high-pressure air passage 21. A high-pressure air chamber 7 is formed between the check valve assembly, the connector 2, and the outer sleeve 1. The check valve assembly is provided with a check valve air passage for connecting the high-pressure air chamber 7 with the gas distribution seat air passage 41. When the check valve assembly opens the high-pressure air passage 21, the high-pressure air passage 21 communicates with the high-pressure air chamber 7. The high-pressure gas in the high-pressure air chamber 7 is exhausted through the check valve air passage, the gas distribution seat air passage 41, the central passage 51, and the slag blowing passage 31, blowing up the residue at the bottom of the hole to improve the slag removal effect, thereby increasing the drilling speed of the hammer. It can be seen that compared with the prior art, the down-the-hole impactor in the embodiment of the utility model is provided with a check valve air channel on the check valve assembly, and the high-pressure air chamber 7 and the gas distribution seat air channel 41 are connected through the check valve air channel. The high-pressure gas can be blown directly through the check valve air channel through the gas distribution seat air channel 41, the central channel 51 and the slag blowing channel 31 to the bottom of the hole to achieve slag blowing, thereby improving the slag discharge effect and increasing the drilling speed.

[0048] It should be noted that in the embodiments of the present invention, high-pressure gas enters the high-pressure gas chamber of the outer sleeve through a high-pressure gas passage. A portion of the high-pressure gas passes through the valve seat to propel the piston back and forth along the axis, thereby providing a pulse force to the drill bit. This portion of the structure of existing down-the-hole impactors is not the focus of this application and will not be described in detail here. A portion of the high-pressure gas passes through the check valve air passage, sequentially through the valve seat air passage 41, the central passage 51, and the slag blowing passage 31, and is blown to the bottom of the hole to achieve slag blowing, thereby improving slag removal and increasing drilling speed.

[0049] The “front end” in the embodiment of the present invention refers to the end of the outer sleeve 1 close to the drill bit assembly 3 , and the “rear end” in the embodiment of the present invention refers to the end of the outer sleeve 1 close to the joint 2 .

[0050] In the above structure, as one of the preferred embodiments, the check valve assembly in the embodiment of the present invention includes a valve stem 61, a accommodating groove 42 and a first elastic member 62, wherein the valve stem 61 includes a connected sealing section 611 and a guide section 612, and the sealing section 611 is provided with a sealing surface 613 at the rear end away from the guide section 612, and the sealing surface 613 has a first state of being in contact with the high-pressure airway 21 and a second state of being separated from the high-pressure airway 21. When the sealing surface 613 is in the first state of being in contact with the outlet of the high-pressure airway 21, the check valve assembly isolates the high-pressure airway 21 from the high-pressure air cavity, and external gas cannot enter the outer sleeve 1. When the sealing surface 613 is in the second state of being separated from the outlet of the high-pressure airway 21, the high-pressure airway 21 is opened, and external gas can enter the outer sleeve 1, so as to provide power for the axial movement of the piston 5 in the inner sleeve. The accommodating groove 42 is arranged on the valve seat 4, and the accommodating groove 42 is used to connect the check valve air channel and the valve seat air channel 41. The accommodating groove 42 is used to be slidably connected with the guide section 612. The two ends of the first elastic member 62 are respectively connected to the ground of the accommodating groove 42 and the valve stem 61. The first elastic member 62 generates elastic reset deformation for switching between the second state and the first state.

[0051] Specifically, a first elastic member 62 is provided between the valve stem 61 and the valve seat 4. When the high-pressure gas passage 21 is not connected to high-pressure gas, the first elastic member 62 is used to provide an initial elastic force for the valve stem 61, so that the blocking surface 613 is in contact with the high-pressure gas passage 21. When the high-pressure gas passage 21 is connected to high-pressure gas, the valve stem 61 is pushed to move under the action of the gas pressure, so that the blocking surface 613 is separated from the high-pressure gas passage 21. At this time, the first elastic member 62 is elastically deformed, and the high-pressure gas in the high-pressure gas passage 21 enters the high-pressure gas chamber 7. The gas in the high-pressure gas chamber 7 enters the accommodating groove 42, the valve seat air passage 41, the central channel 51, and the slag blowing channel 31 through the check valve air passage to blow the slag. When there is no high-pressure gas in the high-pressure gas passage 21, the valve stem 61 is pushed to return to its original position under the action of the elastic return deformation of the first elastic member 62, that is, it returns to the first state in which the blocking surface 613 is in contact with the high-pressure gas passage 21.

[0052] In the above structure, as one of the implementation modes, the check valve air duct in the embodiment of the utility model can be set on the valve stem 61, or on the accommodating groove 42 of the gas distribution seat 4, as long as it is satisfied that when the blocking surface 613 is in the second state separated from the high-pressure air duct 21, the check valve air duct can connect the high-pressure air chamber 7 and the gas distribution seat air duct 41.

[0053] As one of the preferred embodiments, the check valve air channel in the embodiment of the utility model includes a first channel 6121 and a second channel 6122, wherein the first channel 6121 is arranged in the guide section 612, the first channel 6121 extends axially along the guide section 612, the outlet end of the first channel 6121 is connected to the accommodating groove 42, the second channel 6122 is arranged radially along the guide section 612, the second channel 6122 is used to connect the first channel 6121 and the high-pressure gas chamber 7, the second channel 6122 is used to connect the first channel 6121 and the accommodating groove 42, and the high-pressure gas in the high-pressure gas chamber 7 can enter the accommodating groove 42 through the first channel 6121 and the second channel 6122.

[0054] In the above structure, as one implementation mode, at least two second channels 6122 are provided in the embodiment of the present invention, and the second channels 6122 are arranged at intervals in the circumferential direction around the guide section 612 .

[0055] Furthermore, as one of the embodiments, the second channel 6122 in the embodiment of the utility model is arranged at one end of the guide section close to the blocking section 611, and the aperture of the second channel 6122 is specifically 1 mm to 20 mm. The aperture of the second channel 6122 can be selected according to the size of the down-the-hole impactor.

[0056] Existing down-the-hole impactors are often only equipped with one elastic member. Due to the small spring force of the elastic member and the unreasonable propulsion structure, the check valve assembly is easily unable to move quickly, blocking the high-pressure airway 21 and causing the pressure inside the down-the-hole impactor to drop, causing the rock debris at the bottom of the hole to return to the interior of the down-the-hole impactor. As a preferred embodiment, the check valve assembly in the embodiment of the present invention also includes a second elastic member 63, the two ends of which are respectively in contact with the rear end face of the gas distribution seat 4 and the front end face of the blocking section 611. Due to the addition of the second elastic member 63, the movement speed of the valve stem 61 is accelerated, ensuring that the blocking surface 613 can quickly block the high-pressure airway 21 of the connector 2, avoiding the situation where the down-the-hole impactor returns debris. In addition, when the spring force of the elastic member is increased, the blocking surface 613 of the valve stem 61 can more effectively adhere to the inner wall of the high-pressure airway 21 to prevent air leakage.

[0057] Furthermore, when high-pressure gas is input into the high-pressure air channel 21, the sealing surface 613 has to withstand a large air pressure, and then transmits the pressure to the check valve assembly. The check valve assembly adopts a double spring structure, and each elastic part shares part of the pressure, and the service life of the elastic part is longer.

[0058] Furthermore, the second elastic member 63 is sleeved on the outside of the guide section 612 , and the deformation of the second elastic member 63 can be guided by the guide section 612 to avoid the second elastic member 63 from being offset when deformed.

[0059] Furthermore, the second elastic member 63 in the embodiment of the present invention is specifically a spring.

[0060] Furthermore, in order to avoid the situation where the first elastic member 62 is directionally offset when elastically deformed, as one of the preferred embodiments, the check valve assembly in the embodiment of the present invention further includes a guide groove 64, which is arranged in the guide section 612. The inner diameter of the accommodating groove 42 is adapted to the outer diameter of the guide section 612, and is used to guide the movement of the guide section 612. The outer diameter of the first elastic member 62 is adapted to the inner diameter of the guide groove 64. The first elastic member 62 is sleeved in the guide groove 64, and the guide groove 64 is used to guide the first elastic member 62. In addition, the two ends of the first elastic member 62 are respectively in contact with the bottom of the guide groove 64 and the bottom surface of the accommodating groove 42, and the two ends of the second elastic member 63 are respectively in contact with the front end face of the sealing section 611 and the rear end face of the gas distribution seat 4. The force on the valve stem 61 is more balanced, the movement of the valve stem 61 is more stable and reliable, and the response speed of the gas sealing is faster.

[0061] As a specific implementation, the first elastic member 62 in the embodiment of the present invention is specifically a spring.

[0062] In order to avoid friction and wear between the middle of the first elastic member 62 and the inner wall of the accommodating groove 42 during the elastic deformation and elastic return deformation of the first elastic member 62, thereby causing failure of the first elastic member 62, as one of the more preferred implementations, the first elastic member 62 in the embodiment of the utility model is specifically a waist-shaped spring, that is, the outer diameters of the two ends of the first elastic member 62 are larger than the outer diameter of the middle part of the first elastic member 62, thereby avoiding friction and wear between the middle part of the first elastic member 62 and the inner wall of the accommodating groove 42.

[0063] In the above structure, as one preferred embodiment, the check valve assembly in the embodiment of the present invention further includes a positioning groove 65, the inner diameter of which matches the outer diameter of the rear end of the first elastic member 62. The positioning groove 65 positions the rear end of the first elastic member 62, thereby preventing the first elastic member 62 from swinging during compression, ensuring that the first elastic member 62 is positioned at the center of the axis of the valve stem 61, and preventing the first elastic member 62 from wearing during deformation and return deformation.

[0064] As a specific implementation, the first elastic member 62 in the embodiment of the present invention is specifically a spring.

[0065] In order to avoid friction and wear between the middle of the first elastic member 62 and the inner wall of the accommodating groove 42 during the elastic deformation and elastic return deformation of the first elastic member 62, thereby causing failure of the first elastic member 62, as one of the more preferred implementations, the first elastic member 62 in the embodiment of the utility model is specifically a waist-shaped spring, that is, the outer diameters of the two ends of the first elastic member 62 are larger than the outer diameter of the middle part of the first elastic member 62, thereby avoiding friction and wear between the middle part of the first elastic member 62 and the inner wall of the accommodating groove 42.

[0066] As a more preferred embodiment, the check valve assembly in the embodiment of the present invention further includes: a rubber part 66 arranged at one end of the sealing section 611 away from the guide section 612, the rubber part 66 is used to cooperate with the hole wall of the high-pressure air duct 21, the rubber part 66 is fixedly connected to the sealing section 611, and the outer diameter of the rubber part 66 gradually increases from the sealing section 611 to the guide section 612. With this arrangement, the sealing effect of the check valve assembly is better.

[0067] Furthermore, the inner wall of the high-pressure air passage 21 in the embodiment of the present invention that cooperates with the blocking end is specifically a conical structure, and is used in conjunction with the structure of the rubber part 66 .

[0068] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A down-the-hole impactor, characterized in that: include: An outer sleeve (1), wherein both ends of the outer sleeve (1) are respectively connected to a joint (2) and a drill assembly (3); a high-pressure air passage (21) is provided in the joint (2), and a slag blowing passage (31) is provided in the drill assembly (3); A gas distribution seat (4) is arranged in the outer sleeve (1), and a gas distribution seat air passage (41) is provided along the axial direction of the gas distribution seat (4); A piston (5) is movably arranged in the outer sleeve (1), wherein a central channel (51) is provided in the piston (5), and two ends of the central channel (51) are respectively connected to the gas distribution seat air channel (41) and the slag blowing channel (31); A check valve assembly is provided at the rear end of the gas distribution seat (4) for opening and closing the high-pressure air passage (21); a high-pressure air chamber (7) is formed between the check valve assembly, the connector (2) and the outer sleeve (1); a check valve air passage is provided in the check valve assembly for communicating the high-pressure air chamber (7) and the gas distribution seat air passage (41).

2. The down-the-hole impactor according to claim 1, characterized in that The check valve assembly comprises: A valve stem (61), the valve stem comprising a connected blocking section (611) and a guide section (612), a blocking surface (613) being provided at a rear end of the blocking section (611) away from the guide section (612), the blocking surface (613) having a first state in contact with the high-pressure air passage (21) and a second state separated from the high-pressure air passage (21); A receiving groove (42) provided on the gas distribution seat (4) for connecting the check valve airway and the gas distribution seat airway (41), the receiving groove (42) being used for sliding connection with the guide section (612); A first elastic member (62), wherein both ends of the first elastic member (62) are respectively connected to the bottom surface of the accommodating groove (42) and the valve stem (61), and the first elastic member (62) generates elastic reset deformation for switching between the second state and the first state.

3. The down-the-hole impactor according to claim 2, characterized in that The check valve airway comprises: a first channel (6121) provided in the guide section (612), the first channel (6121) extending axially along the guide section (612), the first channel (6121) being in communication with the accommodating groove (42); A second channel (6122) is provided radially along the guide section (612), wherein the second channel (6122) is used to connect the first channel (6121) and the high-pressure gas chamber (7).

4. The down-the-hole impactor according to claim 3, characterized in that At least two second channels (6122) are provided, and the second channels (6122) are arranged at circumferential intervals around the guide section (612).

5. The down-the-hole impactor according to claim 3, characterized in that: The second channel (6122) is provided at one end of the guide section (612) close to the blocking section (611), and the aperture of the second channel (6122) is specifically 1 mm to 20 mm.

6. The down-the-hole hammer according to any one of claims 2 to 5, characterized in that The check valve assembly further includes: A second elastic member (63) is sleeved on the outside of the guide section (612), wherein the second elastic member (63) is sleeved on the outside of the guide section (612), and both ends of the second elastic member (63) are respectively in contact with the rear end face of the gas distribution seat (4) and the front end face of the blocking section (611).

7. The down-the-hole impactor according to claim 6, characterized in that The check valve assembly further includes: A guide groove (64) is provided in the guide section (612), the inner diameter of the accommodating groove (42) is adapted to the outer diameter of the guide section (612), and the outer diameter of the first elastic member (62) is adapted to the inner diameter of the guide groove (64).

8. The down-the-hole impactor according to claim 7, characterized in that: The check valve assembly further includes: A positioning groove (65) is provided at the bottom of the accommodating groove (42), and the inner diameter of the positioning groove (65) is adapted to the outer diameter of the rear end of the first elastic member (62).

9. The down-the-hole impactor according to claim 8, characterized in that The first elastic member (62) is specifically a waist-shaped spring, and the diameters of both ends of the first elastic member (62) are larger than the diameter of the middle portion.

10. The down-the-hole hammer according to any one of claims 2 to 5 and 7 to 9, characterized in that: The check valve assembly further includes: A rubber portion (66) is provided at one end of the blocking section (611) away from the guide section (612), the rubber portion (66) being used to cooperate with the hole wall of the high-pressure airway (21), the rubber portion (66) being fixedly connected to the blocking section (611), and the outer diameter of the rubber portion (66) gradually increasing along the direction from the blocking section (611) to the guide section (612).

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