A down-the-hole hammer device

Abstract

The present application relates to the field of piling and drilling equipment, in particular to a down-the-hole hammer device, comprising a drill rod, an impactor and a drill bit connected in sequence, the drill rod and the impactor are internally provided with an impact air duct for applying driving airflow to the drill bit; further comprising a slag discharge generator, the slag discharge generator is installed on the drill rod, a first slag discharge channel is formed on the slag discharge generator, the first slag discharge channel is communicated with the impact air duct through a jet suction hole; when the airflow in the impact air duct flows through the jet suction hole, the jet suction hole and the first slag discharge channel can suck the air therein to form a negative pressure in the first slag discharge channel to suck the slag; through the setting of the slag discharge generator, relying on the airflow flow in the existing impact air duct in the down-the-hole hammer, the slag discharge generator can suck the slag in the well, compared with the reverse circulation down-the-hole hammer structure, it is simpler, can reduce the cost, and can also solve the problems of dust raising, environmental pollution and the like when discharging the slag in the positive circulation down-the-hole hammer.

Description

Technical Field

[0001] This invention relates to the field of piling and drilling equipment, and specifically to a down-the-hole hammer device. Background Technology

[0002] The pneumatic down-the-hole hammer is one of the most efficient hard rock drilling tools. It uses compressed air as the power medium and drives the drill bit to strike the rock and soil through an impactor to drill.

[0003] Down-the-hole hammers are divided into positive circulation down-the-hole hammers and reverse circulation down-the-hole hammers. Positive circulation involves venting high-pressure gas from the impactor and drill bit to the bottom of the well during drilling, allowing the slag such as gravel and soil at the bottom of the well to be discharged upwards to the surface through the gap between the down-the-hole hammer and the well wall under the action of airflow. It can directly use the compressed air in the impactor as a power source, has a simpler structure and lower production cost, but the slag discharged from the well shaft can cause problems such as dust and pollution of the external environment.

[0004] A reverse circulation down-the-hole hammer involves additional reverse circulation holes on the drill bit, impactor, and drill pipe. The reverse circulation hole on the drill bit side connects to the bottom of the well, while the reverse circulation hole on the drill pipe connects to a collection device on the ground. After a negative pressure is formed at the top of the reverse circulation hole, the slag from the bottom of the pile and the bottom of the well can be sucked into the drill pipe and collection device for centralized collection and treatment, which can avoid problems such as dust. However, the drill bit and impactor in a reverse circulation down-the-hole hammer have a more complex structure and higher manufacturing costs.

[0005] The present invention aims to provide a down-the-hole hammer that is simpler in structure than a reverse circulation down-the-hole hammer, can reduce costs, and can solve the problems of dust and environmental pollution when discharging slag in a forward circulation down-the-hole hammer. Summary of the Invention

[0006] To achieve the above-mentioned technical effects, the present invention provides a down-the-hole hammer device, comprising a drill rod, an impactor, and a drill bit connected in sequence, wherein the drill rod and the impactor are provided with an impact air duct for applying a driving airflow to the drill bit;

[0007] It also includes a slag discharge generator, which is installed on the drill rod and has a first slag discharge channel. The first slag discharge channel is connected to the impact air duct through a suction hole.

[0008] When the airflow in the impact duct passes through the suction hole, it can draw in the air in the suction hole and the first slag discharge channel to form a negative pressure in the first slag discharge channel and draw in the slag.

[0009] Preferably, an injection chamber is provided at the part where the first slag discharge channel communicates with the injection hole, and an injection ring is installed in the injection chamber. Several ventilation holes are spaced apart along the circumferential direction on the ring wall of the injection ring.

[0010] The suction ring can separate the inner and outer sides of the suction chamber, so that when the suction ring is installed in the suction chamber, the suction chamber is connected to the first slag discharge channel through the vent hole.

[0011] Preferably, the ventilation holes on the ring wall of the suction ring are all oblique holes. When the suction ring is installed in the suction cavity, the angle between the airflow direction in the ventilation hole and the movement direction of the slag in the first slag discharge channel is an obtuse angle.

[0012] Preferably, a filter unit is provided on the suction hole and / or the vent hole.

[0013] Preferably, the slag discharge generator has a tapered slag inlet end face at the end closest to the drill bit, and the diameter of the tapered slag inlet end face gradually increases in the direction away from the drill bit;

[0014] The first slag discharge channel is formed by opening a hole in the conical surface and extending in a direction away from the drill bit.

[0015] Preferably, it also includes a sealer, which is disposed on the drill pipe and located on the side of the slag generator away from the drill bit, and the sealer is capable of sealing the gap between the drill pipe and the well wall;

[0016] The bottom of the drill bit has an exhaust hole that communicates with the impact air duct.

[0017] Preferably, a second slag discharge channel is provided inside the drill pipe, one end of the second slag discharge channel is connected to the first slag discharge channel, and the other end of the second slag discharge channel is connected to an external collection device.

[0018] Preferably, a rotary joint is installed on the drill pipe, and a guide groove is provided inside the rotary joint. The guide groove is connected between the second slag discharge channel and the external collection device.

[0019] Preferably, the slag generator is installed between the drill rod and the impactor. The slag generator includes a slag discharge seat and a mounting mandrel. The two ends of the mounting mandrel are respectively fixedly installed on the drill rod and the impactor. The mounting mandrel has a hollow structure inside and is connected to the impact air ducts on the drill rod and the impactor respectively.

[0020] The first slag discharge channel is located on the slag discharge seat;

[0021] The suction holes include a first suction hole formed on the mounting mandrel that connects to the impact air duct, and a second suction hole formed on the slag discharge seat that connects to the impact air duct and the first slag discharge channel.

[0022] Preferably, the portion of the impactor that faces the slag feed generator is provided with a clearance structure.

[0023] By applying the technical solution provided by this invention, a slag generator is installed on the drill pipe. The slag generator has a first slag discharge channel inside, which is connected to the impact air duct of the down-the-hole hammer through a suction port. While the drill bit is driven to drill through the impact air duct by high-pressure airflow, the air in the first slag discharge channel can be extracted through the suction port, thereby creating a negative pressure in the first slag discharge channel, allowing the slag generator to suck in slag. By setting up the slag generator, relying on the airflow in the existing impact air duct of the down-the-hole hammer, the slag generator can suck up the slag in the well. Compared with the reverse circulation down-the-hole hammer, the structure is simpler, the cost can be reduced, and the problems of dust and environmental pollution when discharging slag in the positive circulation down-the-hole hammer can also be solved. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the down-the-hole hammer device provided in an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the installation position of the slag discharge generator in the down-the-hole hammer device provided in this embodiment of the invention;

[0026] Figure 3 This is a schematic diagram of the slag discharge generator in the down-the-hole hammer device provided in this embodiment of the invention;

[0027] Figure 4 This is a schematic diagram of the suction ring structure in the down-the-hole hammer device provided in this embodiment of the invention;

[0028] The components are as follows: 1. Drill bit; 11. Vent hole; 2. Impactor; 21. First impact air duct; 3. Slag generator; 31. Slag seat; 311. First slag discharge channel; 312. First suction hole; 313. Slag inlet face; 314. Suction chamber; 32. Mounting mandrel; 321. Second impact air duct; 322. Second suction hole; 33. Suction ring; 331. Vent hole; 4. Drill rod; 41. Third impact air duct; 42. Second slag discharge channel; 43. Mounting hole; 5. Rotary joint; 51. Guide groove; 6. Well wall; 7. Sealer. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Figure 1 This is a schematic diagram of the overall structure of the down-the-hole hammer device provided in an embodiment of the present invention.

[0031] like Figure 1 As shown, this embodiment of the invention provides a down-the-hole hammer device, including a drill bit 1, an impactor 2, and a drill rod 4. A first impact air channel 21 and a third impact air channel 41 for applying impact force to the drill bit 1 are provided inside the impactor 2 and the drill rod 4. An external power head (not shown in the figure) is connected to the drill rod 4 through a mounting hole 43 at its top. The external power head can inject compressed air into the impact air channel.

[0032] A slag generator 3 is also installed on the drill pipe 4. The slag generator 3 has a first slag discharge channel 311. The first slag discharge channel 311 is connected to the third impact air channel 41 on the drill pipe 4 through a jet suction hole. During the drilling process of the down-the-hole hammer device, compressed air is injected into the third impact air channel 41. Based on the principle of jet suction, the high-speed airflow in the third impact air channel 41 can carry the air in the jet suction hole and the first slag discharge channel 311, so that a negative pressure is formed in the first slag discharge channel 311, thereby realizing the absorption of the broken rock and soil formed during drilling in the well.

[0033] With the above settings, drill bits and impactors can use the corresponding components from the relatively low-cost positive circulation down-the-hole hammer, which significantly reduces production costs compared to the existing reverse circulation down-the-hole hammer. At the same time, it also solves the problem of dust and environmental pollution when the traditional positive circulation down-the-hole hammer discharges bottom slag, and realizes centralized collection of slag for easy subsequent processing.

[0034] Furthermore, in one specific embodiment, the drill bit 1 and impactor 2 of the down-the-hole hammer device both adopt corresponding components from existing positive circulation down-the-hole hammers, i.e., drill bits and impactors with internal impact air channels, while the drill rod adopts components from existing reverse circulation down-the-hole hammers, i.e., drill rods with internal impact air channels and slag discharge channels. A slag discharge generator 3 is installed between the drill rod and the impactor. Based on this configuration, during drilling, the compressed air entering the impactor 2 and the drill bit 1 drives the drill bit 1 to drill forward while simultaneously being discharged through the through hole on the positive circulation drill bit 1, realizing the positive circulation process. At the same time, when the compressed air flows in the impact air channel, it can also create a negative pressure at the slag discharge generator 3, enabling the slag discharge generator 3 to suck up slag, and the slag is discharged through the slag discharge generator 3 and the reverse circulation drill rod 4. In other words, relying on the existing compressed air flow, both positive and reverse circulation processes can be realized simultaneously.

[0035] The impactor 2 may include an air distribution device and a piston. The air distribution device has an upper air chamber and a lower air chamber connected to the impact air duct. When compressed air enters the upper air chamber, it drives the piston downward; when compressed air enters the lower air chamber, it drives the piston upward. This converts the internal energy of the compressed air into the mechanical energy of the piston's movement, thereby driving the drill bit to perform high-frequency impact on the rock and soil in the well, achieving drilling. It should be noted that the impactor 2 and the drill bit 1 can be any existing positive circulation impactor and drill bit with an impact air duct, as long as the drill rod 4 and the impactor 2 have an impact air duct for introducing compressed air. The above content is only a brief description of the principle of the drill bit 1, the impactor 2, the drill rod 4, and their internal impact air duct, and should not be regarded as a limitation of the present invention.

[0036] The aforementioned external power head and the connection between the drill rod 4 and the external power head can adopt the existing connection method in down-the-hole hammer structure, which will not be elaborated here. Additionally, the first slag discharge channel 311 on the slag generator 3 can be vertically arranged, such as... Figure 1 As shown, this design allows the slag in the well to more easily enter the first slag discharge channel 311 when it moves upward, improving slag suction and discharge efficiency. The first slag discharge channel 311 can also be adjusted to other orientations according to actual working conditions. It should also be noted that the slag generator 3 and the drill pipe 4 can be fixedly connected or be an integrally formed structure, which will not be elaborated here.

[0037] Figure 2 This is a schematic diagram of the installation position of the slag discharge generator in the down-the-hole hammer device provided in this embodiment of the invention; Figure 3 This is a schematic diagram of the slag discharge generator in the down-the-hole hammer device provided in this embodiment of the invention.

[0038] like Figure 2 and Figure 3 As shown, in one preferred embodiment, a suction cavity 314 is provided at the part of the first slag discharge channel 311 that communicates with the suction hole. A suction ring 33 is installed in the suction cavity 314. A plurality of ventilation holes 331 are spaced apart circumferentially on the ring wall of the suction ring 33. The two end faces of the suction ring 33 can fit with the two end faces of the suction cavity 314 that are perpendicular to the direction of slag movement in the first slag discharge channel 311, so that the first slag discharge channel 311 and the suction hole can only be connected through the ventilation holes 331 of the suction ring 33.

[0039] like Figure 2 and Figure 3As shown, the suction cavity 314 can be an annular groove formed by expanding outward in the circumferential direction within the first slag discharge channel 311. The outer diameter of the suction ring 33 is smaller than the inner diameter of the annular groove of the suction cavity 314, and its height is equal to the height of the suction cavity 314. The suction cavity 314 and the suction ring 33 can also adopt other shapes, as long as they can separate the external space (the space connecting the suction hole) of the suction cavity 314 from the internal space (the space connecting the first slag discharge channel) after the suction ring 33 is installed in the suction cavity 314, so that airflow can only pass through the vent hole 331 between the inside and outside of the suction cavity 314.

[0040] With the arrangement of the suction chamber 314 and the suction ring 33, when the airflow in the impact duct flows, the external space of the suction chamber 314 is first negatively pressured through the suction hole, and then the air inside the suction chamber 314 is drawn out through the vent hole 331. This allows the air inside the suction chamber 314 (i.e., the space of the first slag discharge channel) to flow outward in a relatively uniform circumferential direction. As a result, when a negative pressure is formed in the first slag discharge channel 311, the negative pressure in each part along the radial direction is relatively uniform, which can improve the effect of slag absorption.

[0041] The inner wall contour of the suction ring 33 can be the same as the cross-sectional shape of the first slag discharge channel 311, such as... Figure 2 As shown, after the suction ring 33 is installed in the suction cavity 314, the inner wall contour of the suction ring 33 coincides with the cross-section of the first slag discharge channel 311 at the suction cavity 314, forming a complete channel. Alternatively, the inner wall contour of the suction ring 33 can be set to be slightly larger than the cross-sectional size of the first slag discharge channel 311. When the slag moves in the first slag discharge channel 311, it has a large upward inertia, which makes its upward speed along the first slag discharge channel 311 larger, while the component speed moving in other directions is relatively smaller. By setting the inner wall contour of the suction ring 33 to be slightly larger than the cross-sectional size of the first slag discharge channel 311, the vent 331 can be further away from the vertically moving slag in the first slag discharge channel 311, reducing the possibility of the slag escaping from the first slag discharge channel 311 through the vent 331.

[0042] Figure 4 This is a schematic diagram of the suction ring structure in the down-the-hole hammer device provided in this embodiment of the invention.

[0043] like Figure 2 and Figure 4 As shown, the ventilation holes 331 on the ring wall of the suction ring 33 are all oblique holes. When the suction ring 33 is installed in the suction chamber 314, the angle between the airflow direction in the ventilation holes 331 and the movement direction of the slag in the first slag discharge channel 311 is an obtuse angle. Figure 2In the process, the slag material moves vertically upward, and the vent 331 extends obliquely downward along the radial side of the suction ring 33. The slag material inside the first slag discharge channel 311 and the suction ring 33 has a strong upward inertia. Therefore, setting the vent 331 as an oblique hole extending downward can further reduce the possibility of the slag material in the first slag discharge channel 311 entering the vent 331.

[0044] Furthermore, in one preferred embodiment, a filter unit may be provided on the suction port and / or vent 331. The filter unit allows airflow to pass through and blocks slag material in the first slag discharge channel 311 from passing through. The filter unit may be an existing filter structure such as a filter screen.

[0045] like Figure 2 As shown, in one preferred embodiment, the slag generator 3 has a slag inlet end face 313 at the end facing the drill bit 1. The slag inlet end face 313 is a conical surface with a diameter that gradually increases in the direction away from the drill bit 1. The first slag discharge channel 311 is formed by opening a hole in the slag inlet end face 313 and extending in the direction away from the drill bit 1.

[0046] During drilling, the diameter of the drill bit in the drilling equipment is generally larger than the diameter of other components to allow other drilling equipment above the drill bit to enter the well smoothly. Therefore, when the slag generator 3 picks up the slag below the drill bit 1, the slag inlet face 313 is actually located inside the drill bit 1. When the slag moves around the drill bit towards the slag inlet face 313, there is a certain degree of radial inward movement along the drilling equipment. Therefore, setting the slag inlet face 313 of the slag generator 3 as a conical surface is more conducive to the slag entering the slag discharge channel of the slag generator 3 when it moves upward and slightly inward, thereby improving the slag discharge efficiency.

[0047] It should also be noted that, in Figure 1 and Figure 2 In the illustrated embodiment, the suction cavity 314 is located in the middle of the two end faces of the first slag discharge channel 311, away from the slag discharge generator 3. In some other embodiments, to facilitate the processing of the suction cavity 314 and the installation of the suction ring 33 in the suction cavity, the suction cavity 314 can be located at the slag inlet end face 313 at the port of the slag discharge generator 3 of the first slag discharge channel 311. The suction ring 33 can then be directly embedded in the slag inlet end face 313. If the end face of the slag inlet end face 313 is a slope, the corresponding end faces of the suction cavity 314 and the suction ring 33 can also be sloped and coplanar with the surface of the slag inlet end face 313 to ensure smooth suction of slag.

[0048] In addition, Figure 3In the illustrated embodiment, there are a total of eight first slag discharge channels 311 on the slag discharge generator 3, and the number of corresponding jet suction holes and jet suction chambers 314 is also eight. Moreover, the air flow channels formed by each first slag discharge channel 311, jet suction hole, and jet suction chamber 314 are evenly arranged around the axis of the slag discharge generator 3, forming a "rice" shape. When the air flow in the impact air duct circulates, the negative pressure intensity formed in the air flow channels composed of each first slag discharge channel 311, jet suction hole, and jet suction chamber 314 is the same, improving the uniformity of slag material suction by multiple first slag discharge channels 311, and thus enhancing the slag discharge efficiency. In actual production, the number of the first slag discharge channels 311 can also be adjusted to other numbers according to actual requirements, which will not be elaborated here.

[0049] As Figure 1 shown, in one of the preferred embodiments, an exhaust hole 11 communicating with the impact air duct is provided at the bottom of the drill bit 1; during the drilling process, high-pressure air flow is continuously introduced into the drill bit 1 in the impact air duct. The drill bit 1 completes rock fragmentation drilling under the action of the impactor and the high-pressure air flow. At the same time, the high-pressure air flow in the drill bit 1 is discharged from the exhaust hole 11. Similar to the principle of the positive circulation down-the-hole hammer, the air flow discharged from the exhaust hole 11 can drive the crushed stones, soil slag and other slag materials at the bottom of the well to move upward. Thus, while a reverse circulation can be achieved at the slag discharge generator 3 and the drill pipe 4, a positive circulation can be achieved at the drill bit 1 at the bottom of the well, that is, the slag materials are discharged upward from both the inner and outer sides of the drill pipe 4, which has a good use effect in some occasions where it is necessary to quickly discharge the bottom slag materials of the well for continuous drilling.

[0050] Furthermore, on the basis of the above content, a seal 7 is further included. The seal 7 is provided on the drill pipe 4 and is located on the side of the slag discharge generator 3 away from the drill bit 1. The seal 7 can fit and seal the gap between the wellbore wall 6 of the drilled well and the drill pipe 4 along the radial direction. When the air flow discharged from the exhaust hole 11 of the drill bit 1 drives the crushed stones, soil slag and other slag materials at the bottom of the well to move upward, due to the sealing between the wellbore wall 6 and the drill pipe 4 by the seal 7, the slag materials enter the slag discharge generator 3 under the action of the positive pressure air flow at the bottom of the well and the negative pressure of the slag discharge generator 3.

[0051] Through the above settings, on the one hand, while generating negative pressure in the slag discharge generator 3 through structures such as jet suction holes to suck the slag materials, the seal 7 and the exhaust hole 11 are also provided to form a positive pressure in the wellbore below the seal 7 and form an air flow loop of impact air duct - exhaust hole - inside the wellbore - slag discharge generator, which can further improve the efficiency of the slag discharge generator 3 in sucking the slag materials; on the other hand, the seal 7 can also prevent the slag materials from being directly discharged out of the wellhead between the wellbore wall 6 and the drill pipe 4 under the action of the positive pressure air flow at the bottom of the well, thus avoiding environmental pollution.

[0052] The sealing device 7 can be made of materials such as hard rubber. Since the sealing device 7 needs to contact the well wall and also needs to move back and forth in the well with the downhole hammer, the outer wall of the sealing device 7 should have strong wear resistance. In actual use, the appropriate sealing device material can be selected according to the geological factors of the well, which will not be elaborated here.

[0053] In addition, the high-pressure airflow introduced into the drill bit 1 can also be discharged in other ways. For example, a return air duct can be set on the drill bit 1, the impactor 2 and the drill rod 4 to recover the high-pressure air. And, similar to the structure of the impact air duct, the return air duct can also be connected to the slag discharge channel in the slag discharge generator 3 through the suction hole to achieve efficient utilization of the high-pressure air going back and forth, and at the same time improve the slag discharge efficiency of the slag discharge generator 3.

[0054] like Figure 1 As shown, in one preferred embodiment, the drill pipe 4 is provided with a second slag discharge channel 42 for connecting the first slag discharge channel 311 and an external collection device. After the slag generator 3 sucks in the slag, the slag in the first slag discharge channel 311 continues to move into the second slag discharge channel 42 under the action of inertia, and is then discharged to the collection device outside the well through the second slag discharge channel 42. The collection device can be an existing device for collecting materials such as gravel and soil. In addition, the number of second slag discharge channels 42 should correspond to the number of first slag discharge channels 311 on the slag generator 3.

[0055] In one preferred embodiment, a rotary joint 5 is mounted on the drill pipe 4, such as... Figure 1 As shown, the rotary joint 5 is provided with a guide groove 51 inside. One end of the guide groove 51 faces downward and connects to the second slag discharge channel 42, and the other end faces horizontally and connects to the external pipeline.

[0056] exist Figure 1 In the illustrated embodiment, both the first slag discharge channel 311 and the second slag discharge channel 42 extend vertically. A bend guide is provided between the vertical and horizontal sections of the guide chute 51. After the slag in the well is sucked up by the slag generator 3, it moves vertically upwards to the top of the drill pipe 4, and then is guided horizontally by the bend guide of the guide chute 51. This makes the entire movement of the slag smoother and facilitates rapid slag discharge. Simultaneously, a compression pump or similar device can be installed in the collection equipment or pipeline downstream of the rotary joint 5 to maintain a negative pressure inside the rotary joint 5, thereby improving the efficiency of the slag generator 3 in sucking up slag.

[0057] Among them, sealing structures can be set between the first slag discharge channel 311 and the second slag discharge channel 42, and between the second slag discharge channel 42 and the guide chute 51. For example, a countersunk hole or a countersunk trough can be opened at the connection of adjacent channels, and sealing devices such as sealing gaskets can be installed in the countersunk hole or the countersunk trough to ensure the sealing of the entire slag discharge channel.

[0058] In addition, the slag in the first slag discharge channel 311 of the slag generator 3 can also be discharged to the outside of the well in other ways, such as by directly connecting the pipeline to the external collection equipment on the first slag discharge channel 311.

[0059] like Figure 1 and Figure 2 As shown, in one preferred embodiment, the slag generator 3 is installed between the drill rod 4 and the impactor 2. The slag generator 3 includes a mounting mandrel 32 and a slag seat 31. The two ends of the mounting mandrel 32 are fixedly installed on the drill rod 4 and the impactor 2, respectively. A second impact air channel 321 is opened inside the mounting mandrel 32 to connect the first impact air channel 21 and the third impact air channel 41. The first slag discharge channel 311 is set on the slag seat 31. The suction holes are divided into a first suction hole 312 set on the slag seat 31 to connect the first slag discharge channel 311, and a second suction hole 322 set on the mounting mandrel 32 to connect the first suction hole 312 and the second impact air channel 321. Each first slag discharge channel 311 is connected to the second impact air channel 321 through the corresponding first suction hole 312 and second suction hole 322, thereby realizing slag discharge.

[0060] The mounting mandrel 32 and the slag discharge seat 31 can be separate or integrally formed. The slag discharge generator 3 is installed between the drill pipe 4 and the impactor 2 via the mounting mandrel 32, ensuring that the slag inlet face 313 of the slag discharge generator 3 is as close as possible to the bottom of the well, thereby improving the efficiency of slag removal near the drill bit 1 at the bottom of the well. Furthermore, the bottom of the slag discharge seat 31 can be designed to extend axially downwards to the outside of the impactor 2, further bringing the slag inlet face 313 of the slag discharge seat 31 closer to the bottom of the well and improving slag discharge efficiency.

[0061] like Figure 2 As shown, in one preferred embodiment, a clearance structure is provided at the part of the impactor 2 that is close to the slag generator 3, which facilitates the entry of slag in the well into the slag generator 3 and reduces the impact or friction of the slag on the impactor 2 when it moves at high speed, thereby improving durability.

[0062] In addition, Figure 1 and Figure 2In the embodiment shown, the slag generator 3 is installed between the drill pipe 4 and the impactor 2. In actual production and use, the slag generator 3 can also be installed on the outer radial side of the drill pipe 4 or other positions, as long as the first slag discharge channel 311 inside the slag generator 3 can be connected to the impact air duct through the suction hole and suck up the slag in the well.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A down-the-hole hammer device, characterized in that, It includes a drill rod, an impactor, and a drill bit connected in sequence, wherein the drill rod and the impactor are provided with impact air channels for applying driving airflow to the drill bit; It also includes a slag discharge generator, which is installed on the drill rod and has a first slag discharge channel. The first slag discharge channel is connected to the impact air duct through a suction hole. When the airflow in the impact duct passes through the suction hole, it can draw in the air in the suction hole and the first slag discharge channel to form a negative pressure in the first slag discharge channel and draw in the slag material. An injection chamber is provided at the part where the first slag discharge channel communicates with the injection hole. An injection ring is installed in the injection chamber, and several ventilation holes are spaced apart along the circumferential direction on the ring wall of the injection ring. The suction ring can separate the inner and outer sides of the suction chamber, so that when the suction ring is installed in the suction chamber, the suction chamber is connected to the first slag discharge channel through the vent hole. The ventilation holes on the ring wall of the suction ring are all oblique holes. When the suction ring is installed in the suction cavity, the angle between the airflow direction in the ventilation hole and the movement direction of the slag in the first slag discharge channel is an obtuse angle. The slag discharge generator has a tapered slag inlet end face at the end closest to the drill bit, and the diameter of the tapered slag inlet end face gradually increases in the direction away from the drill bit. The first slag discharge channel is formed by opening a hole in the conical surface and extending in a direction away from the drill bit; The bottom of the drill bit is provided with an exhaust hole that communicates with the impact air duct; The drill pipe is provided with a second slag discharge channel. One end of the second slag discharge channel is connected to the first slag discharge channel, and the other end of the second slag discharge channel is connected to an external collection device. The slag generator is installed between the drill rod and the impactor. The slag generator includes a slag discharge seat and a mounting mandrel. The two ends of the mounting mandrel are fixedly installed on the drill rod and the impactor, respectively. The mounting mandrel has a hollow structure inside and is connected to the impact air ducts on the drill rod and the impactor, respectively. The first slag discharge channel is located on the slag discharge seat; The suction holes include a first suction hole formed on the mounting mandrel that connects to the impact air duct, and a second suction hole formed on the slag discharge seat that connects to the impact air duct and the first slag discharge channel.

2. The down-the-hole hammer device according to claim 1, characterized in that, A filter unit is provided on the suction hole and / or the vent hole.

3. The down-the-hole hammer device according to claim 1, characterized in that, It also includes a sealer, which is disposed on the drill pipe and located on the side of the slag generator away from the drill bit, and the sealer is capable of sealing the gap between the drill pipe and the well wall.

4. The down-the-hole hammer device according to claim 1, characterized in that, A rotary joint is installed on the drill pipe, and a guide groove is provided inside the rotary joint. The guide groove connects the second slag discharge channel and the external collection device.

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