Impactor with tail pipe structure

Abstract

The present application relates to the technical field of impactor equipment, and in particular to an impactor with a tail pipe structure, which includes an impactor joint, an outer cylinder, a check valve, a check valve seat, a gas distribution rod, a piston and a drill bit; the axial channel passed through by the piston cooperates with the single outer diameter straight rod of the gas distribution rod, and the piston can slide smoothly to impact the drill bit under the action of compressed gas, effectively alleviating the problem of the piston of the impactor getting stuck and stuck in the background technology; the gas distribution rod channel, the axial channel and the slag blowing channel are connected in sequence, and a sealing member is provided in the gas distribution rod channel; when it is necessary to increase the slag discharge airflow of the impactor, a small air vent is provided through the sealing member to realize the connection between the gas distribution rod channel and the axial channel, while ensuring that the piston can reciprocate and impact, part of the compressed air flow is directly transmitted to the slag blowing hole of the drill bit through the gas distribution rod channel, the axial channel of the piston, the inner hole of the nylon tube section and the slag blowing channel of the drill bit in sequence, effectively enhancing the slag discharge airflow, and improving the slag discharge capacity and drilling speed of the impactor.

Description

Technical Field

[0001] The present application relates to the technical field of impactors, and in particular to an impactor with a tail pipe structure. Background Art

[0002] Hammers are widely used in drilling and reaming operations; Figure 1 Chinese patent CN201273137Y describes a new down-the-hole impactor with a nylon tube structure. The gas distribution rod in this impactor is a stepped cylindrical rod, and the piston bore also has a matching internal step. As the piston moves on the gas distribution rod, when it reaches the stepped position on the gas distribution rod, the piston's inner step can easily get caught on the outer cylindrical step of the gas distribution rod, causing the piston to become stuck and inoperative. Furthermore, the piston's air path is a blind hole design, making it difficult for machining tools to access the sharp edges and corners of the piston's internal hole. Furthermore, the gas path design between the piston and the gas distribution rod in this impactor prevents the adjustment of the slag removal airflow. Summary of the Invention

[0003] The technical solutions provided by the present invention are as follows:

[0004] An impactor with a tail pipe structure, comprising an impactor joint, an outer cylinder, a check valve, a check valve seat, a gas distribution rod, a piston and a drill bit;

[0005] The impactor joint is mounted on one end of the outer cylinder, and the drill bit is mounted on the other end of the outer cylinder; the impactor joint is provided with an air inlet channel; the drill bit is provided with a slag blowing channel and a slag blowing hole;

[0006] The first end of the check valve is arranged in the mounting hole of the check valve seat, and a spring is arranged between the check valve at this end and the bottom of the mounting hole of the check valve seat; the second end of the check valve is connected to the air inlet channel of the impactor joint;

[0007] The check valve seat is provided with a check valve seat air passage, one end of the check valve seat air passage is communicated with the gas distribution rod passage, and the other end of the check valve seat air passage is communicated with the air inlet passage for opening the check valve;

[0008] The piston is movably installed in the outer cylinder, and an axial passage is provided through the piston. The piston is slidably sleeved on the valve rod using the axial passage.

[0009] The piston forms a front cavity with the outer cylinder at its front end, and a rear cavity with the outer cylinder at its rear end; a first air channel is provided on the side wall of the piston, one end of the first air channel is connected to the front cavity, and the other end of the first air channel is connected to the air distribution hole; a second air channel is provided on the side wall of the piston, one end of the second air channel is connected to the rear cavity, and the other end of the second air channel is connected to the axial channel;

[0010] A tail pipe section is provided between the drill bit and the piston, one end of the tail pipe section is fixed to one end of the slag blowing channel of the drill bit; the other end of the tail pipe section extends out of the slag blowing channel and can be inserted into the axial channel of the piston.

[0011] Furthermore, the valve rod section for sliding insertion into the axial passage of the piston is a straight rod section with a single outer diameter.

[0012] Furthermore, one end of the straight rod section is connected to the check valve seat and communicates with the check valve seat air channel; the other end of the gas distribution rod channel of the straight rod section is a closed end for correspondingly inserting the axial channel of the piston.

[0013] Furthermore, the gas distribution rod passage of the straight rod section is a passage extending axially through the rod; one end of the straight rod section is connected to the check valve seat and communicates with the check valve seat air passage; a blocking member is provided in the gas distribution rod passage near the other end of the straight rod section. Preferably, the second air passage communicates with the axial passage of the piston at the rear end of the blocking member.

[0014] Furthermore, the blocking member is a valve or a plug, and the blocking member is used to block direct communication between the gas distribution rod channel and the axial channel.

[0015] The blocking member is a valve, which can realize small-diameter communication between the gas distribution rod channel and the axial channel of the piston by controlling the opening of the valve, ensuring that the compressed air flow (compressed gas) entering the gas distribution rod channel enters the first air channel and the second air channel of the piston in sequence according to the movement position of the piston, and finally enters the front cavity and the rear cavity, realizing the reciprocating motion impact of the piston, while realizing that part of the compressed air flow is directly transmitted to the slag blowing hole of the drill bit through the gas distribution rod channel, the axial channel of the piston, the inner hole of the nylon tube section and the slag blowing channel of the drill bit in sequence, effectively enhancing the slag discharge air flow and improving the slag discharge capacity and drilling speed of the impactor.

[0016] Alternatively, the sealing member is a plug, which is provided with a through-vent hole, and the small-diameter conduction of the gas distribution rod channel and the axial channel of the piston is achieved based on the vent hole, while ensuring that the compressed air flow (compressed gas) entering the gas distribution rod channel enters the first air channel and the second air channel of the piston in sequence according to the movement position of the piston, and finally enters the front cavity and the rear cavity, realizing the reciprocating motion impact of the piston, while realizing that part of the compressed air flow is directly transmitted to the slag blowing hole of the drill bit through the gas distribution rod channel, the axial channel of the piston, the inner hole of the nylon tube section and the slag blowing channel of the drill bit in sequence, effectively enhancing the slag discharge airflow, and improving the slag discharge ability and drilling speed of the impactor.

[0017] Furthermore, a bushing is provided in the outer cylinder near one end of the drill bit, and the tail of the drill bit is inserted into the bushing in the outer cylinder, and the piston moves to the end face of the tail of the drill bit so that the front cavity is closed.

[0018] Furthermore, a clamping ring and a drill sleeve are provided in one end of the outer cylinder, and the drill bit is fixed to the other end of the outer cylinder through the clamping ring and the drill sleeve.

[0019] Furthermore, the axial channel of the piston is arranged corresponding to the slag blowing channel of the drill bit.

[0020] Furthermore, the first air channel is an inclined channel, and the angle between the axis of the first air channel and the axis of the axial channel of the piston is 10-75 degrees.

[0021] Furthermore, the second air channel is an inclined channel, and the angle between the axis of the second air channel and the axis of the axial channel of the piston is 10-75 degrees.

[0022] Beneficial effects:

[0023] The present application provides an impactor with a tail pipe structure, comprising an impactor joint, an outer cylinder, a check valve, a check valve seat, a gas distribution rod, a piston and a drill bit; the piston is movably installed in the outer cylinder, the piston is provided with an axial passage running through it, and the piston is slidably sleeved on the gas distribution rod using the axial passage; the piston forms a front cavity at its front end and the outer cylinder, and forms a rear cavity at its rear end and the outer cylinder. In the impactor of the present application, the axial channel passed through by the piston is combined with the single outer diameter straight rod of the gas distribution rod, so that the piston can slide smoothly to impact the drill bit, effectively alleviating the problem of the piston getting stuck in the impactor of the background technology; at the same time, the design of the axial channel passed through by the piston allows the tool to be fully extended into the inner hole channel passed through by the piston during processing, effectively reducing the processing difficulty of the inner hole channel of the piston; in addition, the gas distribution rod channel, the axial channel and the slag blowing channel are connected in sequence, and a sealing member is provided in the gas distribution rod channel; when it is necessary to increase the slag discharge airflow of the impactor, a small air vent is provided through the sealing member to achieve the connection between the gas distribution rod channel and the axial channel, while ensuring that the compressed airflow (compressed gas) flowing into the gas distribution rod channel enters the first air channel and the second air channel of the piston in sequence according to the piston movement position, and finally enters the front cavity and the rear cavity, realizing the reciprocating motion impact of the piston, while realizing that part of the compressed airflow is directly transmitted to the slag blowing hole of the drill bit through the gas distribution rod channel, the axial channel of the piston, the inner hole of the nylon tube section and the slag blowing channel of the drill bit in sequence, effectively enhancing the slag discharge airflow, and improving the slag discharge capacity and drilling speed of the impactor. The impactor of the present application has the advantages of a short airflow channel, a smooth airflow direction, and a small airflow resistance, thereby reducing the air pressure loss during the reciprocating impact of the piston and increasing the impact efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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 recorded in this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 is a schematic diagram of an existing impactor;

[0026] Figure 2 A schematic diagram of an impactor with a tail pipe structure according to the present invention;

[0027] Figure numerals: 1. impactor joint, 2. outer cylinder, 3. check valve, 4. check valve seat, 5. distribution rod, 6. piston, 6.1. first air channel, 6.2. second air channel, 7. drill bit, 7.1. slag blowing channel, 7.2. slag blowing hole, 8. bushing, 9. retaining ring, 10. drill sleeve, 11. rear chamber, 12. front chamber, 13. nylon pipe section, 14. sealing part. DETAILED DESCRIPTION

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] Reference Figure 2 As shown, the present invention provides an impactor with a tail pipe structure, comprising an impactor joint 1, an outer cylinder 2, a check valve 3, a check valve seat 4, an air distribution rod 5, a piston 6 and a drill bit 7; the impactor joint is mounted on one end of the outer cylinder, and the drill bit is mounted on the other end of the outer cylinder; the impactor joint is provided with an air inlet channel; the drill bit 7 is provided with a slag blowing channel 7.1 and a slag blowing hole 7.2; the air distribution rod is provided with an air distribution rod channel, and the air distribution rod side wall is provided with a radial air distribution hole connected to the air distribution rod channel; the first end of the check valve is arranged in the mounting hole of the check valve seat, and a spring is provided between the check valve at this end and the bottom of the mounting hole of the check valve seat; the second end of the check valve is connected to the air inlet channel of the impactor joint; the check valve seat is provided with a check valve seat air channel, and one end of the check valve seat air channel is connected to the The gas distribution rod channel is connected, and the other end of the check valve seat air channel is connected to the air intake channel that opens the check valve; the piston is movably installed in the outer cylinder, and the piston is provided with an axial channel running through it, and the piston is slidably sleeved on the gas distribution rod using the axial channel; the piston 6 forms a front cavity 12 with the outer cylinder 2 at its front end, and forms a rear cavity 11 with the outer cylinder 2 at its rear end; the side wall of the piston 6 is provided with a first air channel 6.1, one end of the first air channel is connected to the front cavity; the side wall of the piston 6 is provided with a second air channel 6.2, one end of the second air channel is connected to the rear cavity; a tail pipe section is provided between the drill bit and the piston, one end of the tail pipe section is fixed to one end of the slag blowing channel of the drill bit; the other end of the tail pipe section extends out of the slag blowing channel and can be inserted into the axial channel of the piston.

[0034] In the above scheme, the compressed gas input from the air inlet channel of the impactor joint overcomes the elastic force of the spring in the check valve seat, opens the check valve, and the air channel of the check valve seat connects the air inlet channel and the gas distribution rod channel. The compressed gas flows from the air channel of the check valve seat into the gas distribution rod channel of the gas distribution rod, and then flows into the front cavity through the radial gas distribution hole and the first air channel. In the impactor of the present application, the axial channel through which the piston passes is combined with the single outer diameter straight rod of the gas distribution rod, so that the piston can slide smoothly to impact the drill bit under the power of the compressed gas, effectively alleviating the problem of the piston getting stuck in the impactor of the background technology; at the same time, the design of the axial channel through which the piston passes allows the tool to fully extend into the inner hole channel through which the piston passes during processing, effectively reducing the difficulty of processing the inner hole channel of the piston.

[0035] In this embodiment, the drill bit includes a drill head and a drill tail. The drill head is provided with an inclined slag blowing hole, and the drill tail is provided with an axial slag blowing channel 6.1. The slag blowing channel extends to the drill head and connects to the slag blowing hole 6.2. The tail pipe section is preferably a nylon pipe section 13.

[0036] In a preferred embodiment, the valve rod segment into which the piston's axial passage slides is a straight rod segment with a single outer diameter. A cylindrical rod with a single caliber is preferred, as this structure is simple and easily achieves a uniform clearance fit between the rod and the piston's axial passage, allowing the piston to slide and impact smoothly under the power of the compressed gas.

[0037] As an optional embodiment, one end of the straight rod section is connected to the check valve seat and communicates with the air passage of the check valve seat; the other end of the gas distribution rod channel of the straight rod section is a closed end for correspondingly inserting the axial channel of the piston.

[0038] In a preferred embodiment, the gas distribution rod passage of the straight rod section is a passage extending axially through the rod; one end of the straight rod section is connected to the check valve seat and communicates with the check valve seat air passage; a sealing member 14 is provided in the gas distribution rod passage near the other end of the straight rod section. More preferably, the second air passage communicates with the axial passage of the piston at the rear end of the sealing member.

[0039] The blocking member is a valve or a plug, and is used to block direct communication between the gas distribution rod channel and the axial channel.

[0040] The blocking member is a valve, which can realize small-aperture communication between the gas distribution rod channel and the axial channel of the piston by controlling the opening of the valve, ensuring that the compressed air flow (compressed gas) entering the gas distribution rod channel enters the first air channel and the second air channel of the piston in sequence according to the movement position of the piston, and finally enters the front cavity and the rear cavity, realizing the reciprocating motion impact of the piston, while realizing that part of the compressed air flow can be directly transmitted to the slag blowing hole of the drill bit through the gas distribution rod channel, the axial channel of the piston, the inner hole of the nylon tube section and the slag blowing channel of the drill bit in sequence, effectively enhancing the slag discharge air flow, and improving the slag discharge capacity and drilling speed of the impactor.

[0041] The blocking member is a plug, which is provided with a vent hole passing through it. The vent hole is used to achieve small-diameter conduction between the gas distribution rod channel and the axial channel of the piston. While ensuring that the compressed air flow (compressed gas) entering the gas distribution rod channel enters the first air channel and the second air channel of the piston in sequence according to the piston movement position, and finally enters the front cavity and the rear cavity, thereby achieving the reciprocating impact of the piston, part of the compressed air flow can be directly transmitted to the slag blowing hole of the drill bit through the gas distribution rod channel, the axial channel of the piston, the inner hole of the nylon tube section and the slag blowing channel of the drill bit in sequence, effectively enhancing the slag discharge airflow and improving the slag discharge capacity and drilling speed of the impactor. The aperture of the vent hole is preferably 1-10mm; by replacing the vent hole plugs with different apertures, the slag discharge airflow of the impactor can be adjusted. The specific aperture of the vent hole in the plug is set according to the actual slag blowing working conditions. Generally, the larger the aperture, the stronger the slag discharge airflow of the impactor. It should be noted that the ratio of the conductive aperture of the sealing piece to the aperture of the gas distribution rod channel can be obtained through the impactor drilling operation test to avoid most of the air flow in the gas distribution rod channel directly flowing into the axial channel, thereby reducing the frequency and impact force of the reciprocating motion of the piston impacting the drill bit.

[0042] The impactor of the present application has a gas distribution rod channel, an axial channel and a slag blowing channel that are connected in sequence, and a plugging piece is provided in the gas distribution rod channel. When it is necessary to increase the slag discharge airflow of the impactor, a small vent hole is provided through the plugging piece to connect the gas distribution rod channel and the axial channel. While ensuring that the compressed airflow (compressed gas) flowing into the gas distribution rod channel enters the first and second air channels of the piston in sequence according to the piston movement position, and finally enters the front cavity and the rear cavity to realize the reciprocating impact of the piston, part of the compressed airflow can be directly transmitted to the slag blowing hole of the drill bit through the gas distribution rod channel, the axial channel of the piston, the inner hole of the nylon tube section and the slag blowing channel of the drill bit in sequence, effectively enhancing the slag discharge airflow and improving the slag discharge capacity and drilling speed of the impactor. The slag discharge airflow of the impactor can be adjusted by the size of the vent hole on the plugging piece, thereby solving the problem of weak slag discharge capacity or poor slag discharge effect of the existing impactor.

[0043] As an optional embodiment, a bushing 8 is provided in the outer cylinder near one end of the drill bit, and the tail of the drill bit is inserted into the bushing in the outer cylinder, and the piston moves to the end face of the tail of the drill bit to close the front cavity.

[0044] As an optional embodiment, a retaining ring 9 and a drill clamping sleeve 10 are provided in one end of the outer cylinder, and the drill bit is fixed to the other end of the outer cylinder by the retaining ring and the drill clamping sleeve. In this embodiment, the tail of the drill bit is connected to the outer cylinder by a spline and is fixed by the retaining ring and the drill clamping sleeve provided in the outer cylinder.

[0045] Preferably, the axial channel of the piston is arranged corresponding to the slag blowing channel of the drill bit.

[0046] In a preferred embodiment, the first air channel is an inclined channel, and the angle between the axis of the first air channel and the axis of the axial passage of the piston is 10-75 degrees, preferably 45 degrees. The second air channel is an inclined channel, and the angle between the axis of the second air channel and the axis of the axial passage of the piston is 10-75 degrees, preferably 45 degrees.

[0047] More preferably, the first air duct and the second air duct are arranged at the piston end close to the rear cavity, and the first air duct and the second air duct are distributed on both sides of the axial channel. The air path structure design of the impactor of the present application has the advantages of a short air flow channel, a smooth air flow direction, and low air flow resistance. The inclined first and second air ducts in the piston are designed, and their inclination direction is consistent with the flow direction of the compressed gas, which is conducive to the smooth flow of the compressed gas, the small air pressure loss during the reciprocating motion of the piston, and the high impact efficiency.

[0048] The impact principle of the impactor of the present application is as follows: compressed gas is input into the air inlet channel of the impactor joint, overcomes the spring resistance to open the check valve, enters the air distribution rod channel in sequence through the air channel of the check valve seat, and then enters the first air channel of the piston from the radial air distribution hole of the air distribution rod, and then enters the front cavity of the piston through the air groove of the outer circle of the piston and the air groove of the inner hole of the outer cylinder. When the pressure in the front cavity increases, the high-pressure airflow pushes the piston to move rapidly toward the rear cavity of the piston. After moving a certain distance, the air distribution hole of the air distribution rod and the first air channel of the piston are staggered and closed, and the front cavity no longer takes in air. When the piston moves a certain distance again, the air distribution hole of the air distribution rod is connected with the second air channel of the piston, and the high-pressure airflow enters the rear cavity through the second air channel of the piston and the air groove of the outer circle, causing the pressure in the rear cavity to rise. At the same time, the front end of the piston is disengaged from the nylon tube at the tail end of the drill bit, and the gas in the front chamber is discharged from the inner hole of the nylon tube, the slag blowing channel and the slag blowing hole of the drill bit, and the pressure in the front chamber is reduced. Under the action of the high-pressure airflow in the rear chamber, the piston moves rapidly toward the front chamber of the piston until the front end face of the piston hits the tail end face of the drill bit, and the impact force of the piston is transmitted to the carbide teeth on the drill head through the drill bit body, and finally the rock is broken by the alloy teeth. The alternating reciprocating air intake and exhaust in the front and rear chambers of the piston make the piston continuously reciprocate to hit the drill bit, thereby realizing the drilling operation of the drill bit. At the same time, the high-pressure gas discharged from the front and rear chambers of the piston is blown out through the slag blowing channel and the slag blowing hole of the drill bit, thereby blowing out the rock slag, mud and water in the drilling operation. When the compressed air flow stops entering the impactor joint end, the check valve moves rapidly toward the joint air hole channel under the thrust of the spring, sealing the air inlet channel of the impactor joint, forming a semi-closed cavity inside the impactor, preventing rock debris, mud and water at the bottom of the hole from entering the interior of the impactor, thereby avoiding the impactor piston from getting stuck and unable to work.

[0049] When it is necessary to improve the slag removal effect of the impactor, the opening of the sealing member-valve is controlled, or a through vent hole is set on the plug, and the aperture of the vent hole is preferably 1-10mm; a small aperture is realized to conduct the axial gas distribution rod channel and the axial channel of the piston, while ensuring that the compressed air flow (compressed gas) flowing into the gas distribution rod channel enters the first air channel and the second air channel of the piston in sequence according to the piston movement position, and finally enters the front cavity and the rear cavity, realizing the reciprocating impact of the piston, while realizing that part of the compressed air flow can be directly transmitted to the slag blowing hole of the drill bit through the gas distribution rod channel, the axial channel of the piston, the inner hole of the nylon tube section and the slag blowing channel of the drill bit in sequence, effectively enhancing the slag removal airflow and improving the slag removal ability and drilling speed of the impactor. Within the aperture range of 1-10mm, the larger the aperture, the stronger the slag removal airflow of the impactor. The specific aperture is set according to the actual slag blowing working conditions. It should be noted that the ratio of the conducting aperture of the sealing member to the aperture of the gas distribution rod channel can be obtained through the impactor drilling operation test.

[0050] In summary, in the impactor of the present application, the axial channel passed through by the piston is combined with the single outer diameter straight rod of the gas distribution rod, so that the piston can slide smoothly to impact the drill bit, effectively alleviating the problem of the piston getting stuck in the impactor in the background technology; at the same time, the design of the axial channel passed through by the piston allows the tool to be fully inserted into the inner hole channel passed through by the piston during processing, effectively reducing the processing difficulty of the inner hole channel of the piston; in addition, the gas distribution rod channel, the axial channel and the slag blowing channel are connected in sequence, and a sealing member is provided in the gas distribution rod channel. When it is necessary to increase the slag discharge airflow of the impactor, a small air vent is provided on the sealing member to connect the gas distribution rod channel and the axial channel, while ensuring that the compressed airflow (compressed gas) flowing into the gas distribution rod channel enters the first air channel and the second air channel of the piston in sequence according to the piston movement position, and finally enters the front cavity and the rear cavity, realizing the reciprocating motion impact of the piston, while realizing that part of the compressed airflow can be directly transmitted to the slag blowing hole of the drill bit through the gas distribution rod channel, the axial channel of the piston, the inner hole of the nylon tube section and the slag blowing channel of the drill bit in sequence, effectively enhancing the slag discharge airflow, and improving the slag discharge capacity and drilling speed of the impactor. The impactor of the present application has the advantages of a short airflow channel, a smooth airflow direction, and a small airflow resistance, thereby reducing the air pressure loss during the reciprocating impact of the piston and increasing the impact efficiency.

[0051] While the portions not described in detail above are referenced to prior art, the above description of the disclosed embodiments is intended to 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 intended to be 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. An impactor with a tail pipe structure, characterized in that: It includes an impactor joint, an outer cylinder, a check valve, a check valve seat, a gas distribution rod, a piston and a drill bit; The impactor joint is mounted on one end of the outer cylinder, and the drill bit is mounted on the other end of the outer cylinder; the impactor joint is provided with an air inlet channel; the drill bit is provided with a slag blowing channel and a slag blowing hole; The gas distribution rod is provided with a gas distribution rod channel, and the side wall of the gas distribution rod is provided with a gas distribution hole connected to the gas distribution rod channel; The first end of the check valve is arranged in the mounting hole of the check valve seat, and a spring is arranged between the check valve at this end and the bottom of the mounting hole of the check valve seat; the second end of the check valve is connected to the air inlet channel of the impactor joint; The check valve seat is provided with a check valve seat air passage, one end of the check valve seat air passage is communicated with the gas distribution rod passage, and the other end of the check valve seat air passage is communicated with the air inlet passage for opening the check valve; The piston is movably installed in the outer cylinder, and an axial passage is provided through the piston. The piston is slidably sleeved on the valve rod using the axial passage. The piston forms a front cavity with the outer cylinder at its front end, and forms a rear cavity with the outer cylinder at its rear end; a first air channel is provided on the side wall of the piston, one end of the first air channel is connected to the front cavity; a second air channel is provided on the side wall of the piston, one end of the second air channel is connected to the rear cavity; A tail pipe section is provided between the drill bit and the piston, one end of the tail pipe section is fixed to one end of the slag blowing channel of the drill bit; the other end of the tail pipe section extends out of the slag blowing channel and can be inserted into the axial channel of the piston; The valve distribution rod section for sliding insertion of the axial channel of the piston is a straight rod section with a single outer diameter.

2. The impactor with a tail pipe structure according to claim 1, characterized in that: One end of the straight rod section is connected to the check valve seat and communicates with the check valve seat air channel; the other end of the gas distribution rod channel of the straight rod section is a closed end for correspondingly inserting the axial channel of the piston.

3. The impactor with a tail pipe structure according to claim 2, characterized in that: The gas distribution rod channel of the straight rod section is a channel that penetrates along the rod axis; one end of the straight rod section is connected to the check valve seat and communicates with the check valve seat airway; a sealing member is provided in the gas distribution rod channel near the other end of the straight rod section.

4. The impactor with a tail pipe structure according to claim 3, characterized in that: The blocking member is a valve or a plug, and is used to block direct communication between the gas distribution rod channel and the axial channel.

5. The impactor with a tail pipe structure according to any one of claims 1 to 4, characterized in that: A bushing is provided in the outer cylinder near one end of the drill bit, and the tail of the drill bit is inserted into the bushing in the outer cylinder. The piston moves to the end face of the tail of the drill bit so that the front cavity is closed.

6. The impactor with a tail pipe structure according to claim 5, characterized in that: A clamping ring and a drill clamping sleeve are arranged in one end of the outer cylinder, and the drill bit is fixed to the other end of the outer cylinder through the clamping ring and the drill clamping sleeve.

7. The impactor with a tail pipe structure according to any one of claims 1 to 4 and 6, characterized in that: The axial passage of the piston is arranged corresponding to the slag blowing passage of the drill bit.

8. The impactor with a tail pipe structure according to claim 7, characterized in that: The first air channel is an inclined channel, and the angle between the axis of the first air channel and the axis of the axial channel of the piston is 10-75 degrees.

9. The impactor with a tail pipe structure according to claim 8, characterized in that: The second air channel is an inclined channel, and the angle between the axis of the second air channel and the axis of the axial channel of the piston is 10-75 degrees.

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