Down-hole hammer device

Abstract

The invention relates to the field of piling and drilling equipment, in particular to a down-the-hole hammer device which comprises a drill rod, an impactor and a drill bit which are sequentially connected, and impact air channels used for applying driving airflow to the drill bit are arranged in the drill rod and the impactor; the drilling machine further comprises a slag discharging generator, the slag discharging generator is installed on the drilling rod, a first slag discharging channel is formed in the slag discharging generator, and the first slag discharging channel is communicated with the impact air channel through an injection and suction hole. When airflow in the impact air duct flows through the injection and suction hole, air in the injection and suction hole and the first slag discharge channel can be sucked, so that negative pressure is formed in the first slag discharge channel to suck slag; through the arrangement of the slag discharge generator, the slag discharge generator can suck slag in a well depending on the flowing of air flow in the existing impact air duct in the down-the-hole hammer, compared with a reverse circulation down-the-hole hammer, the structure is simpler, the cost can be reduced, and the problems of dust raising, environment pollution and the like when slag is discharged in a positive circulation down-the-hole hammer can be solved.

Description

Technical Field

[0001] The present invention relates to the field of pile driving and drilling equipment, and particularly relates to a down-the-hole hammer device. Background Art

[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 the impactor for drilling.

[0003] The down-the-hole hammer is divided into a positive circulation down-the-hole hammer and a reverse circulation down-the-hole hammer. In positive circulation, when drilling, the high-pressure gas in the impactor and the drill bit is discharged to the bottom of the well, so that the crushed stone soil and other slag materials at the bottom of the well are discharged upward to the ground along the gap between the down-the-hole hammer and the well wall under the action of the air flow. The compressed air in the impactor can be directly used as the power source, and the structure is relatively simple and the production cost is low. However, there are problems such as dust raising and environmental pollution outside the well when the discharged slag is discharged from the wellbore.

[0004] The reverse circulation down-the-hole hammer is additionally provided with reverse circulation holes on the drill bit, the impactor and the drill pipe. The reverse circulation holes on the drill bit side communicate with the bottom of the well, and the reverse circulation holes on the drill pipe are connected to the collection equipment on the ground. After a negative pressure is formed at the top of the reverse circulation holes, the slag at the bottom of the pile and the bottom of the well can be sucked into the drill pipe and the collection equipment for centralized collection and treatment, which can avoid problems such as dust raising. However, the structures of the drill bit and the impactor in the reverse circulation down-the-hole hammer are relatively complex, and the processing and production costs are relatively high.

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

[0006] In order to achieve the above technical effects, the present invention provides a down-the-hole hammer device, including a drill pipe, an impactor and a drill bit connected in sequence. An impact air duct for applying a driving air flow to the drill bit is provided inside the drill pipe and the impactor.

[0007] It further includes a slag discharge generator installed on the drill pipe. A first slag discharge channel is provided on the slag discharge generator, and the first slag discharge channel is communicated with the impact air duct through a jet suction hole.

[0008] Wherein, when the air flow in the impact air duct flows through the jet suction hole, it can suck the air in the jet suction hole and the first slag discharge channel, so as to form a negative pressure in the first slag discharge channel and suck in the slag.

[0009] Preferably, a jet suction cavity is provided at the part where the first slag discharge channel is communicated with the jet suction hole. A jet suction ring is installed in the jet suction cavity, and a plurality of ventilation holes are circumferentially spaced apart on the ring wall of the jet suction ring.

[0010] The jet-suction ring can separate the inner side and the outer side of the jet-suction cavity, so that after the jet-suction ring is installed in the jet-suction cavity, the jet-suction cavity communicates with the first slag discharge channel through the ventilation holes.

[0011] Preferably, the ventilation holes formed in the ring wall of the jet-suction ring are all inclined holes. After the jet-suction ring is installed in the jet-suction cavity, the included angle between the air flow direction in the ventilation holes and the slag movement direction in the first slag discharge channel is an obtuse angle.

[0012] Preferably, a filtering unit is arranged on the jet-suction holes and / or the ventilation holes.

[0013] Preferably, one end of the slag discharge generator close to the drill bit has a conical slag inlet end face, and the diameter of the conical surface of the slag inlet end face gradually increases in the direction away from the drill bit;

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

[0015] Preferably, a closer is further included. The closer is arranged on the drill pipe and on the side of the slag discharge generator away from the drill bit. The closer can seal the gap between the drill pipe and the well wall of the well.

[0016] An exhaust hole communicating with the impact air duct is formed at the bottom of the drill bit.

[0017] Preferably, a second slag discharge channel is arranged inside the drill pipe. One end of the second slag discharge channel communicates with the first slag discharge channel, and the other end of the second slag discharge channel communicates with an external collection device.

[0018] Preferably, a rotary joint is installed on the drill pipe. A guiding chute is arranged inside the rotary joint, and the guiding chute communicates between the second slag discharge channel and the external collection device.

[0019] Preferably, the slag discharge generator is installed between the drill pipe and the impactor. The slag discharge generator includes a slag discharge seat and a mounting mandrel. Two ends of the mounting mandrel are respectively fixedly installed on the drill pipe and the impactor. The inside of the mounting mandrel is a hollow structure and communicates with the impact air ducts on the drill pipe and the impactor respectively;

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

[0021] The jet-suction holes include a first jet-suction hole formed on the mounting mandrel and communicating with the impact air duct, and a second jet-suction hole formed on the slag discharge seat and communicating with the impact air duct and the first slag discharge channel.

[0022] Preferably, a yielding structure is provided at a position of the impactor close to the slag feed generator.

[0023] By applying the technical solution provided by the present invention, a slag discharge generator is installed on the drill pipe, a first slag discharge channel is opened inside the slag discharge generator, and the first slag discharge channel is connected to the impact air duct of the down-the-hole hammer through the suction hole. When a high-pressure airflow is introduced into the impact air duct to drive the drill bit to drill, the air in the first slag discharge channel can be extracted through the suction hole, thereby forming a negative pressure in the first slag discharge channel, so that the slag discharge generator can suck in the slag material; through the setting of the slag discharge generator, relying on the airflow in the existing impact air duct in the down-the-hole hammer, the slag discharge generator can absorb the slag material in the well, which is simpler in structure than the reverse circulation down-the-hole hammer, can reduce costs, and can also solve the problems of dust and environmental pollution when discharging slag material in the positive circulation down-the-hole hammer. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0026] Figure 3 1 is a schematic structural diagram of a slag discharge generator in a down-the-hole hammer device provided in an embodiment of the present invention;

[0027] Figure 4 2 is a schematic diagram of the structure of a shooting and suction ring in a down-the-hole hammer device provided by an embodiment of the present invention;

[0028] Among them, 1. drill bit; 11. exhaust hole; 2. impactor; 21. first impact air duct; 3. slag discharge generator; 31. slag discharge seat; 311. first slag discharge channel; 312. first shooting and suction hole; 313. slag inlet end face; 314. shooting and suction cavity; 32. installation mandrel; 321. second impact air duct; 322. second shooting and suction hole; 33. shooting and suction ring; 331. vent; 4. drill rod; 41. third impact air duct; 42. second slag discharge channel; 43; installation hole; 5. rotary joint; 51. guide slide; 6. well wall; 7. sealer. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

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

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

[0032] A slag discharge generator 3 is further installed on the drill pipe 4. A first slag discharge channel 311 is opened on the slag discharge generator 3. The first slag discharge channel 311 is communicated with the third impact air duct 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 duct 41. Based on the principle of jet suction, the high-speed air flow in the third impact air duct 41 can entrain 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, realizing the suction of the broken rock and soil formed during the well drilling.

[0033] Through the above settings, components such as the drill bit and the impactor can adopt corresponding components in the positive circulation down-the-hole hammer with relatively low cost, which greatly reduces the production cost compared with the existing reverse circulation down-the-hole hammer. At the same time, it also solves the problems of dust raising and environmental pollution when the traditional positive circulation down-the-hole hammer discharges the bottom slag, realizes the centralized collection of the slag, and is convenient for subsequent treatment.

[0034] Further, in one specific embodiment, the drill bit 1 and the impactor 2 of the down-the-hole hammer device both adopt corresponding components in the existing positive circulation down-the-hole hammer, that is, a drill bit and an impactor with an impact air duct inside, while the drill pipe adopts components in the existing reverse circulation down-the-hole hammer, that is, a drill pipe with an impact air duct and a slag discharge channel inside, and a slag discharge generator 3 is installed between the drill pipe and the impactor. Based on such a setting, during drilling, the compressed air entering the impactor 2 and the drill bit 1 drives the drill bit 1 to drill and is discharged from the through hole on the positive circulation drill bit 1 at the same time, realizing the positive circulation process. At the same time, when the compressed air flows in the impact air duct, a negative pressure can also be formed at the slag discharge generator 3, so that the slag discharge generator 3 can suck the slag and the slag is discharged through the slag discharge generator 3 and the reverse circulation drill pipe 4. That is to say, relying on the existing compressed air flow, the positive circulation and the reverse circulation processes can be realized simultaneously.

[0035] Among them, the impactor 2 may be equipped with a gas distribution device and a piston. The gas distribution device has an upper air chamber and a lower air chamber communicating with the impact air duct. When the compressed air in the impact air duct enters the upper air chamber, it drives the piston to move downward. When the compressed air enters the lower air chamber, it drives the piston to move upward, thereby converting the internal energy of the compressed air into the mechanical energy of the piston movement, and then driving the drill bit to perform high-frequency impact on the rock and soil in the well to achieve drilling. It should be noted that the impactor 2 and the drill bit 1 can adopt any existing positive circulation impactor and drill bit, etc., as long as the drill pipe 4 and the impactor 2 have an impact air duct inside and are used for introducing compressed air. The above content is only a brief description of the principles of the drill bit 1, the impactor 2, the drill pipe 4, and the impact air duct inside them, and should not be regarded as a limitation of the present invention.

[0036] The above-mentioned external power head and the drill pipe 4 and the external power head can adopt the connection method in the existing down-the-hole hammer structure, which will not be elaborated here. In addition, the first slag discharge channel 311 on the slag discharge generator 3 can be vertically arranged, as Figure 1 shown, so that when the slag in the well moves upward, it is easier to directly enter the first slag discharge channel 311, improving the slag suction and discharge efficiency; the first slag discharge channel 311 can also be adjusted to other orientations according to the actual working conditions. It should also be noted that the slag discharge generator 3 and the drill pipe 4 can be fixedly connected or integrally formed as a whole structure, which will not be elaborated here.

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

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

[0039] As Figure 2 and Figure 3As shown, the jet suction chamber 314 can be an annular groove formed by expanding circumferentially outward in the first slag discharge channel 311. The outer diameter of the jet suction ring 33 is smaller than the inner diameter of the annular groove of the jet suction chamber 314, and the height is equal to the height of the jet suction chamber 314. The jet suction chamber 314 and the jet suction ring 33 can also adopt other shaped structures, as long as it can be realized that after the jet suction ring 33 is installed in the jet suction chamber 314, the external space (the space communicating with the jet suction holes) of the jet suction chamber 314 is separated from the internal space (the space communicating with the first slag discharge channel), so that only the air flow can pass through the vent holes 331 between the inside and outside of the jet suction chamber 314.

[0040] Through the arrangement of the jet suction chamber 314 and the jet suction ring 33, when the air flow in the impact air duct circulates, first, a negative pressure is formed in the external space of the jet suction chamber 314 through the jet suction holes, and then the air in the internal space of the jet suction chamber 314 is extracted through the vent holes 331 from the external space of the jet suction chamber 314, so that when the air in the internal space of the jet suction chamber 314 (that is, the space of the first slag discharge channel) flows to the outside, it can flow out more evenly in the circumferential direction. Furthermore, when a negative pressure is formed in the first slag discharge channel 311, the negative pressure at each part in the radial direction inside is relatively uniform, which can improve the effect of sucking the slag.

[0041] Among them, the inner wall contour of the jet 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, when the jet suction ring 33 is installed in the jet suction chamber 314, the inner wall contour of the jet suction ring 33 coincides with the cross-section of the first slag discharge channel 311 at the jet suction chamber 314 to form a complete channel; it can also be set that the inner wall contour of the jet suction ring 33 is 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 movement inertia, so that its upward movement speed along the first slag discharge channel 311 is large, and the component speed in other directions is relatively small. By setting the inner wall contour of the jet suction ring 33 to be slightly larger than the cross-sectional size of the first slag discharge channel 311, the vent holes 331 can be further away from the slag moving vertically in the first slag discharge channel 311, reducing the possibility of the slag escaping from the first slag discharge channel 311 through the vent holes 331.

[0042] Figure 4 It is a schematic structural diagram of the jet suction ring in the down-the-hole hammer device provided by the embodiment of the present invention.

[0043] As Figure 2 And Figure 4 As shown, the vent holes 331 opened on the ring wall of the jet suction ring 33 are all inclined holes. When the jet suction ring 33 is installed in the jet suction chamber 314, the included angle between the air flow direction in the vent holes 331 and the movement direction of the slag in the first slag discharge channel 311 is an obtuse angle. In Figure 2In it, the moving direction of the slag material is vertically upward, and the ventilation holes 331 extend obliquely downward along the outer side below the radial direction of the jet suction ring 33. The slag material in the first slag discharge channel 311 and inside the jet suction ring 33 has a strong upward movement inertia. Therefore, by setting the ventilation holes 331 as obliquely downward extending inclined holes, the possibility of the slag material in the first slag discharge channel 311 entering the ventilation holes 331 can be further reduced.

[0044] Furthermore, in one preferred embodiment, a filtering unit can be provided on the jet suction holes and / or the ventilation holes 331. The filtering unit can allow the air flow to pass through and can block the slag material in the first slag discharge channel 311 from passing through. The filtering unit can be an existing filtering structure such as a filter mesh.

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

[0046] During the drilling process, generally, the diameter of the drill bit in the drilling equipment is larger than that of other components, so that other drilling equipment above the drill bit can smoothly enter the well. Therefore, when the slag discharge generator 3 sucks the slag material below the drill bit 1, the slag inlet end face 313 is actually located inside the drill bit 1. When the slag material bypasses the drill bit and moves towards the slag inlet end face 313, there is a certain degree of movement radially inward along the drilling equipment. Therefore, setting the slag inlet end face 313 of the slag discharge generator 3 as a conical face is more conducive to the slag material entering the slag discharge channel of the slag discharge generator 3 when moving upward and slightly inward, improving the slag discharge efficiency.

[0047] It should also be noted that in Figure 1 and Figure 2 the embodiment shown, the jet suction cavity 314 is opened at the middle position between the two end faces of the first slag discharge channel 311 far from the slag discharge generator 3. In some other embodiments, in order to facilitate the processing of the jet suction cavity 314 and the installation of the jet suction ring 33 in the jet suction cavity, the jet suction cavity 314 can be opened at the part of the first slag discharge channel 311 located at the slag inlet end face 313 of the port of the slag discharge generator 3. The jet suction ring 33 can be directly embedded in the slag inlet end face 313. If the end face shape of the slag inlet end face 313 is an inclined plane, the corresponding end faces of the jet suction cavity 314 and the jet suction ring 33 can be set as inclined planes coplanar with the surface of the slag inlet end face 313 to ensure the smoothness of slag suction.

[0048] In addition, in 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 uniformly arranged around the axis of the slag discharge generator 3 in 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 first slag discharge channels 311 can also be adjusted to other values according to actual needs, which will not be elaborated here.

[0049] As Figure 1 shown, in one preferred embodiment, 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 a 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 arranged 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 radially. 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, since the gap between the wellbore wall 6 and the drill pipe 4 is sealed 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 a 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 from 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] Among them, the sealer 7 can be made of materials such as hard rubber. Since the sealer 7 needs to contact the wellbore and also needs to reciprocate in the well with the down-the-hole hammer, the outer wall of the sealer 7 should have strong wear resistance. In actual use, the appropriate sealer material can be selected according to factors such as the geology of the drilling, which will not be elaborated here.

[0053] In addition, the high-pressure air introduced into the drill bit 1 can also be discharged in other ways. For example, return air ducts can be provided on the drill bit 1, the impactor 2, and the drill pipe 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 jet suction holes to achieve the efficient utilization of the reciprocating high-pressure air and improve the slag discharge efficiency of the slag discharge generator 3 at the same time.

[0054] As Figure 1 shown, in one preferred embodiment, a second slag discharge channel 42 for connecting the first slag discharge channel 311 and the external collection device is provided in the drill pipe 4. After the slag discharge generator 3 sucks the slag material, the slag material in the first slag discharge channel 311 continues to move into the second slag discharge channel 42 under the action of inertia, and then is 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 crushed stones and crushed soil. In addition, the number of the second slag discharge channels 42 should correspond to the number of the first slag discharge channels 311 on the slag discharge generator 3.

[0055] In one preferred embodiment, a rotary joint 5 is installed on the drill pipe 4. As Figure 1 shown, a guiding chute 51 is provided inside the rotary joint 5. One port of the guiding chute 51 faces downward and is connected to the second slag discharge channel 42, and the other port faces horizontally and is connected to the external pipeline.

[0056] In Figure 1 the shown embodiment, both the first slag discharge channel 311 and the second slag discharge channel 42 extend vertically. An elbow guiding portion is provided between the vertical section and the horizontal section of the guiding chute 51. After the slag material in the well is sucked by the slag discharge generator 3, it moves upward along the vertical direction to the top of the drill pipe 4, and then is guided to move horizontally through the elbow guiding portion of the guiding chute 51, making the entire movement process of the slag material smoother and facilitating the rapid discharge of the slag material. At the same time, devices such as a compression pump can be provided in the collection device or pipeline at the downstream end of the rotary joint 5 to make the inside of the rotary joint 5 in a negative pressure state and improve the efficiency of the slag discharge generator 3 sucking the slag material.

[0057] Among them, a sealing structure can be provided between the first slag discharge channel 311 and the second slag discharge channel 42, and between the second slag discharge channel 42 and the guiding chute 51. For example, a counterbore or a counter groove can be formed at the connection of adjacent channels, and a sealing device such as a gasket can be installed in the counterbore or the counter groove to ensure the sealing performance of the entire slag discharge channel.

[0058] In addition, the slag in the first slag discharge channel 311 of the slag discharge generator 3 can also be discharged to the outside of the well by other means. For example, a pipeline leading to an external collection device can be directly connected to the first slag discharge channel 311.

[0059] As Figure 1 shown in Figure 2 In one preferred embodiment, the slag discharge generator 3 is installed between the drill pipe 4 and the impactor 2. The slag discharge generator 3 includes a mounting mandrel 32 and a slag discharge seat 31. Both ends of the mounting mandrel 32 are fixedly installed on the drill pipe 4 and the impactor 2 respectively. A second impact air duct 321 is formed inside the mounting mandrel 32 for communicating with the first impact air duct 21 and the third impact air duct 41. The first slag discharge channel 311 is arranged on the slag discharge seat 31. The suction holes are divided into a first suction hole 312 arranged on the slag discharge seat 31 and communicating with the first slag discharge channel 311, and a second suction hole 322 arranged on the mounting mandrel 32 and communicating the first suction hole 312 with the second impact air duct 321. Each first slag discharge channel 311 communicates with the second impact air duct 321 through the corresponding first suction hole 312 and the second suction hole 322, so as to realize slag discharge.

[0060] Among them, the mounting mandrel 32 and the slag discharge seat 31 can be separately arranged or integrally formed. By installing the slag discharge generator 3 between the drill pipe 4 and the impactor 2 through the mounting mandrel 32, the slag inlet end face 313 of the slag discharge generator 3 is as close to the bottom of the well as possible, so as to improve the suction efficiency of the slag near the drill bit 1 at the bottom of the well. Further, the bottom of the slag discharge seat 31 can be axially extended obliquely downward to the outside of the impactor 2, so that the slag inlet end face 313 of the slag discharge seat 31 is closer to the bottom of the well and the slag discharge efficiency is improved.

[0061] As Figure 2 shown in

[0062] In addition, at Figure 1 shown in Figure 2In the illustrated embodiment, the slag discharging generator 3 is installed between the drill pipe 4 and the impactor 2. During actual production and use, the slag discharging generator 3 can also be installed at other positions such as the radially outer side of the drill pipe 4, as long as the first slag discharging channel 311 in the slag discharging generator 3 can communicate with the impact air duct through the jet suction holes and suck 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 not to limit them. Although the present invention has been described in detail with reference to the embodiments, those of ordinary skill in the art should understand that any modification or equivalent replacement of the technical solutions of the present invention does not depart from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A down-the-hole hammer device, characterized in that: It comprises a drill rod, an impactor and a drill bit connected in sequence, wherein the drill rod and the impactor are provided with impact air ducts for applying driving airflow to the drill bit; It also includes a slag discharge generator, which is installed on the drill pipe. The slag discharge generator is provided with a first slag discharge channel, and the first slag discharge channel is connected to the impact air duct through an injection and suction hole; When the airflow in the impact air duct flows through the ejection and suction holes, it can suck the air in the ejection and suction holes and the first slag discharge channel to form a negative pressure in the first slag discharge channel and suck in slag.

2. The down-the-hole hammer device according to claim 1, characterized in that: An injection and suction cavity is provided at a position where the first slag discharge channel is connected to the injection and suction hole, an injection and suction ring is installed in the injection and suction cavity, and a plurality of vent holes are provided on the ring wall of the injection and suction ring at intervals along the circumferential direction; The injection and suction ring can separate the inner side and the outer side of the injection and suction chamber, so that when the injection and suction ring is installed in the injection and suction chamber, the injection and suction chamber is connected with the first slag discharge channel through the vent hole.

3. The down-the-hole hammer device according to claim 2, characterized in that: The ventilation holes formed on the ring wall of the injection and suction ring are all inclined holes. When the injection and suction ring is installed in the injection and suction cavity, the angle between the air flow direction in the ventilation holes and the movement direction of the slag in the first slag discharge channel is an obtuse angle.

4. The down-the-hole hammer device according to claim 2 or 3, characterized in that: A filter unit is arranged on the injection and suction hole and / or the ventilation hole.

5. The down-the-hole hammer device according to claim 1, characterized in that: The end of the slag discharge generator close to the drill bit is provided with a conical slag feeding end face, and the diameter of the conical surface of the slag feeding end face gradually increases in the direction away from the drill bit; The first slag discharge channel is formed by opening a hole on the conical surface and extending in a direction away from the drill bit.

6. The down-the-hole hammer device according to claim 1, characterized in that: An exhaust hole connected to the impact air duct is provided at the bottom of the drill bit.

7. The down-the-hole hammer device according to claim 6, characterized in that: It also includes a sealer, which is arranged on the drill pipe and located on a side of the slag discharge generator away from the drill bit, and can seal the gap between the drill pipe and the wall of the well.

8. The down-the-hole hammer device according to claim 1, characterized in that: A second slag discharge channel is arranged in the drill rod, 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 collecting device.

9. The down-the-hole hammer device according to claim 7, characterized in that: A rotary joint is installed on the drill rod, a guide chute is arranged inside the rotary joint, and the guide chute is connected between the second slag discharge channel and the external collection device.

10. The down-the-hole hammer device according to claim 1, characterized in that: The deslagging generator is installed between the drill rod and the impactor, and includes a deslagging seat and a mounting mandrel. The two ends of the mounting mandrel are fixedly mounted on the drill rod and the impactor, respectively. The interior of the mounting mandrel is a hollow structure, and is connected to the impact air ducts on the drill rod and the impactor, respectively. The first slag discharge channel is opened on the slag discharge seat; The ejection and suction holes include a first ejection and suction hole opened on the mounting core shaft and connected to the impact air duct, and a second ejection and suction hole opened on the slag discharge seat and connected to the impact air duct and the first slag discharge channel.

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