Reverse circulation anti-blocking device and reverse circulation drilling machine

Abstract

The utility model discloses a reverse circulation anti-blocking device and a reverse circulation drilling machine. The reverse circulation anti-blocking device comprises a slag discharging pipe internally provided with a slag discharging channel. The slag discharging pipe is sleeved with the connecting sleeve, the connecting sleeve is connected with the slag discharging pipe through a connecting assembly, a gas channel is formed among the slag discharging pipe, the connecting assembly and the connecting sleeve, a baffle is arranged on the inner wall of the connecting sleeve, and an air hole is formed between the baffle and the slag discharging pipe; and the one-way valve assembly is arranged between the connecting sleeve and the slag discharging pipe and used for opening and closing the air hole so that high-pressure air can flow in the air channel in a one-way mode. Compared with the prior art, the reverse circulation anti-blocking device and the reverse circulation drilling machine are suitable for the working conditions of deep punching and large water amount, the sealing performance in the high-pressure air channel of the reverse circulation impactor can be improved, and the situation that the piston is stuck is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of rock and soil drilling machinery, and more specifically, to a reverse circulation anti-blocking device and a reverse circulation drilling rig. Background Art

[0002] Pneumatic down-the-hole hammers utilize high-pressure air as their power source, driving the piston within the hammer to reciprocate at high speed and frequency. This provides the piston with sufficient energy to impact the rotating drill bit, resulting in more efficient drilling. The impact force acts as a stress wave on the drill bit, generating enormous impact energy in a very short period of time, effectively breaking rock and quickly creating a hole, achieving the desired rock drilling effect.

[0003] The reverse circulation hammer uses the high-pressure gas discharged after the piston works to blow the crushed rock debris from the bottom of the drilled hole to the center hole of the drill bit and the collection tube for collection. However, when the reverse circulation hammer is used to drill deep holes, due to the high depth of the hole and the high water pressure at the bottom of the hole, the rock debris and water at the bottom of the hole form a mixture. During the process of lifting the drill, if the sealing performance of the check valve in the reverse circulation hammer is not good, under the action of water pressure, the mixture can easily enter the interior of the down-the-hole hammer through the gap between the spline of the drill sleeve and the drill bit, and in severe cases, it may even cause the piston to get stuck and fail to work.

[0004] Therefore, there is an urgent need for a reverse circulation anti-blocking device and a reverse circulation drilling rig, which are suitable for working conditions with deep drilling and large water volume, and can increase the sealing performance in the high-pressure air channel of the reverse circulation impactor to avoid piston jamming. Utility Model Content

[0005] In order to solve the above technical problems, the present application provides a reverse circulation anti-blocking device and a reverse circulation drilling rig, which are suitable for working conditions with deep drilling and large water volume, and can increase the sealing performance in the high-pressure air channel of the reverse circulation impactor to avoid piston jamming.

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

[0007] A reverse circulation anti-blocking device, comprising:

[0008] A slag discharge pipe with a slag discharge channel therein;

[0009] A connecting sleeve is sleeved on the outside of the slag discharge pipe and connected to the slag discharge pipe via a connecting assembly, a gas channel is formed between the slag discharge pipe, the connecting assembly and the connecting sleeve, a baffle is provided on the inner wall of the connecting sleeve, and an air hole is formed between the baffle and the slag discharge pipe;

[0010] A one-way valve assembly is provided between the connecting sleeve and the slag discharge pipe, and the one-way valve assembly is used to open and close the air hole to allow high-pressure gas to flow in one direction in the gas channel.

[0011] Preferably, the connection assembly includes:

[0012] a first positioning ring provided on the inner wall of the front end of the connecting sleeve, the first positioning ring being detachably connected to the connecting sleeve;

[0013] A positioning sleeve fixedly arranged on the outside of the slag discharge pipe, wherein the front end surface of the positioning sleeve abuts against the rear end surface of the first positioning ring for positioning;

[0014] An air passage is arranged along the axial direction of the positioning sleeve.

[0015] Preferably, a positioning groove is provided on the outer surface of the slag discharge pipe, the positioning sleeve is sleeved in the positioning groove, and the positioning sleeve and the slag discharge pipe are detachably connected.

[0016] Preferably, the positioning sleeve comprises:

[0017] Positioning members, at least two of which are provided, wherein a ring groove is provided on the outer side of the positioning members, the positioning members are connected end to end in an annular structure, the middle part of the annular structure forms a mounting opening, the inner diameter of the mounting opening is adapted to the outer diameter of the positioning groove, and an annular groove is formed on the outer side of the annular structure;

[0018] A fastening ring is sleeved in the annular groove to fix the annular structure on the outside of the positioning groove.

[0019] Preferably, at least two gas passages are provided, and the gas passages are arranged at intervals in the circumferential direction around the annular structure.

[0020] Preferably, a mounting ring groove is provided on the inner wall of the connecting sleeve, and the first positioning ring is specifically an annular positioning member with an opening, and the first positioning ring is detachably connected to the mounting ring groove.

[0021] Preferably, the one-way valve assembly comprises:

[0022] A valve stem sleeved on the outside of the slag discharge pipe, the valve stem comprising a blocking section and a guide section connected in sequence, the rear end surface of the blocking section being used in conjunction with the air hole;

[0023] a second positioning ring fixedly arranged on the outer side of the slag discharge pipe, wherein the second positioning ring is arranged at the front end of the valve stem;

[0024] An elastic member is sleeved on the outer side of the guide section, and two ends of the elastic member are respectively in contact with the second positioning ring and the front end surface of the blocking section.

[0025] Preferably, the one-way valve assembly further includes:

[0026] A blocking piece is provided on the rear end surface of the blocking section, and the blocking piece is made of rubber material. The outer diameter of the blocking piece gradually increases from the blocking section to the guide section.

[0027] Preferably, a first sealing ring groove is provided on the inner wall of the front end of the slag discharge pipe, a positioning step is provided in the slag discharge pipe, and a second sealing ring groove is provided on the outer wall of the rear end of the slag discharge pipe.

[0028] A reverse circulation drilling rig comprising a drill pipe, a down-the-hole hammer and the reverse circulation anti-blocking device described in any one of the above;

[0029] in,

[0030] The reverse circulation anti-blocking device is arranged between the drill rod and the down-the-hole hammer; or,

[0031] The reverse circulation anti-blocking device is arranged between two adjacent drill rods.

[0032] The reverse circulation anti-blocking device provided by the utility model is mainly used in conjunction with a reverse circulation impactor and is arranged between adjacent drill rods or between a drill rod and a reverse circulation impactor. First, a slag discharge pipe, a connecting sleeve and a connecting assembly are provided, wherein a slag discharge channel is provided in the slag discharge pipe, and the slag discharge pipe is used to cooperate with the collection pipe in the reverse circulation impactor to discharge the rock slag at the bottom of the hole from the inside. The connecting sleeve is sleeved on the outside of the slag discharge pipe, and the connecting sleeve and the slag discharge pipe are connected by a connecting assembly. A gas channel is formed between the slag discharge pipe, the connecting sleeve and the connecting assembly, and the gas channel is used to provide high-pressure gas to the reverse circulation impactor. A baffle is provided on the inner wall of the connecting sleeve, and an air hole is formed between the baffle and the slag discharge pipe.

[0033] In the process of drilling deep holes in the reverse circulation drilling rig in the prior art, if the sealing performance of the check valve inside the reverse circulation hammer is poor, when the drill is lifted, the air channel inside the reverse circulation hammer may be directly connected to the atmospheric pressure. Due to the high water pressure at the bottom of the hole, the mixture of water and rock debris at the bottom of the hole can easily enter the air channel inside the down-the-hole hammer through the gap between the drill sleeve and the drill bit. When the water pressure at the bottom of the hole is high enough, the mixture may enter the rear air chamber of the reverse circulation hammer through the air channel, causing the piston to get stuck. To avoid this problem, the reverse circulation anti-blocking device provided by the embodiment of the utility model is also provided with a one-way valve assembly. The one-way valve assembly is arranged between the connecting sleeve and the slag discharge pipe. The one-way valve assembly is used to open and close the air hole so that the high-pressure gas flows in one direction in the gas channel to the down-the-hole hammer. If the sealing performance of the check valve assembly inside the reverse circulation hammer is poor, under the action of the one-way valve assembly, the air channel of the reverse circulation hammer will not be directly connected to the atmosphere, preventing the mixture from entering the rear air chamber of the reverse circulation hammer through the air channel, thereby avoiding the piston getting stuck. It can be seen that compared with the prior art, the reverse circulation anti-blocking device in the embodiment of the utility model is suitable for working conditions with deep drilling and large water volume, and can increase the sealing performance of the air channel in the reverse circulation impactor to avoid the piston getting stuck.

[0034] The present invention also provides a reverse circulation drilling rig comprising a drill pipe, a down-the-hole hammer, and the aforementioned reverse circulation anti-blocking device; wherein the reverse circulation anti-blocking device is disposed between the drill pipe and the down-the-hole hammer, or alternatively, between two adjacent drill pipes. The provision of the aforementioned reverse circulation anti-blocking device also enhances the sealing performance of the air passage within the reverse circulation hammer, preventing piston jamming. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0036] Figure 1 It is a structural schematic diagram of a reverse circulation impactor in the prior art;

[0037] Figure 2 A schematic structural diagram of a reverse circulation anti-blocking device provided in this practical embodiment;

[0038] Figure 3 A three-dimensional schematic diagram of a reverse circulation anti-blocking device provided by an embodiment of the present invention from a first angle;

[0039] Figure 4 A perspective schematic diagram of a reverse circulation anti-blocking device provided by an embodiment of the present invention from a second angle;

[0040] Figure 5 A schematic structural diagram of a positioning sleeve provided in an embodiment of the utility model.

[0041] Reference numerals:

[0042] Reverse circulation impactor in the prior art: 10, collection tube; 20, outer cylinder; 30, drill bit assembly; 40, joint assembly; 50, check valve assembly; 60, piston; 70, front air chamber; 80, rear air chamber;

[0043] This application: 1. Slag discharge pipe; 2. Connecting sleeve; 3. Gas channel; 4. Baffle; 51. First positioning ring; 52. Positioning sleeve; 53. Gas channel; 521. Positioning piece; 522. Mounting port; 524. Fastening ring; 61. Valve stem; 62. Second positioning ring; 63. Elastic piece; 64. Sealing piece; 11. First sealing ring groove; 12. Positioning step; 13. Second sealing ring groove. DETAILED DESCRIPTION

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] The embodiments of the present invention are written in a progressive manner.

[0050] like Figures 2 to 5 As shown, an embodiment of the utility model provides a reverse circulation anti-blocking device, comprising: a slag discharge pipe 1 with a slag discharge channel therein; a connecting sleeve 2 which is sleeved on the outside of the slag discharge pipe 1 and connected to the slag discharge pipe 1 through a connecting assembly, a gas channel 3 is formed between the slag discharge pipe 1, the connecting assembly and the connecting sleeve 2, a baffle 4 is provided on the inner wall of the connecting sleeve 2, and an air hole is formed between the baffle 4 and the slag discharge pipe 1; a one-way valve assembly is arranged between the connecting sleeve 2 and the slag discharge pipe 1, the one-way valve assembly is used to open and close the air hole to allow high-pressure gas to flow in one direction in the gas channel.

[0051] like Figure 1 As shown, the current reverse circulation impactor includes a collection tube 10, an outer cylinder 20 sleeved on the outside of the collection tube 10, the front end of the outer cylinder 20 is connected to the drill bit assembly 30, the drill bit assembly 30 is provided with a center hole, the center hole is connected to the collection tube 10, and is used to discharge the residue at the bottom of the hole, the rear end of the outer cylinder 20 is connected to the joint assembly 40, the joint assembly 40 is provided with a high-pressure airway, and a check valve assembly 50 is fixedly provided between the outer cylinder 20 and the collection tube 10. The high-pressure airway is opened by the check valve assembly 50, and the piston 60 is movably sleeved therein. A front air chamber 70 is formed between the collection tube 10 and the outer cylinder 20, wherein the piston 60, the collection tube 10, the outer cylinder 20 and the drill bit assembly 30; a rear air chamber 80 is formed between the piston 60, the collection tube 10, the outer cylinder 20 and the joint assembly 40; and an air passage is formed between the outer cylinder, the piston and the collection tube. When the high-pressure air passage is opened, high-pressure gas enters the air passage, and the air passage is alternately connected with the front air chamber and the rear air chamber, so as to push the piston to move back and forth along the axis of the collection tube, thereby providing a pulse force to the drill bit assembly for drilling.

[0052] When the reverse circulation hammer is in the drill lifting state, no high-pressure gas is introduced into the air passage, and the piston and drill bit assembly are at the bottom. If the sealing performance of the check valve assembly is poor, the air passage is equivalent to being directly connected to the atmospheric pressure, and the air pressure at the bottom of the hole is too high, it is easy for rock debris to enter the air passage through the connection between the drill bit assembly and the outer cylinder. When the air pressure at the bottom of the hole is high to a certain level, rock debris may enter the rear air chamber, causing the piston to get stuck.

[0053] The reverse circulation anti-blocking device provided by the utility model is mainly used in conjunction with a reverse circulation impactor and is arranged between adjacent drill rods or between a drill rod and a reverse circulation impactor. First, a slag discharge pipe 1, a connecting sleeve 2 and a connecting assembly are provided, wherein a slag discharge channel is provided in the slag discharge pipe 1, and the slag discharge pipe 1 is used to cooperate with the collection pipe in the reverse circulation impactor to discharge the rock slag at the bottom of the hole from the inside. The connecting sleeve 2 is mounted on the outside of the slag discharge pipe 1, and the connecting sleeve 2 and the slag discharge pipe 1 are connected through the connecting assembly. A gas channel 3 is formed between the slag discharge pipe 1, the connecting sleeve 2 and the connecting assembly, and the gas channel 3 is used to provide high-pressure gas to the reverse circulation impactor. A baffle 4 is provided on the inner wall of the connecting sleeve 2, and an air hole is formed between the baffle 4 and the slag discharge pipe 1.

[0054] In the process of drilling deep holes in the reverse circulation drilling rig in the prior art, if the sealing performance of the check valve inside the reverse circulation hammer is poor, when the drill is lifted, the air channel inside the reverse circulation hammer may be directly connected to the atmospheric pressure. Due to the high water pressure at the bottom of the hole, the mixture of water and rock debris at the bottom of the hole can easily enter the air channel inside the down-the-hole hammer through the gap between the drill sleeve and the drill bit. When the water pressure at the bottom of the hole is high enough, the mixture may enter the rear air chamber of the reverse circulation hammer through the air channel, causing the piston to get stuck. To avoid this problem, the reverse circulation anti-blocking device provided by the embodiment of the utility model is also provided with a one-way valve assembly. The one-way valve assembly is arranged between the connecting sleeve 2 and the slag discharge pipe 1. The one-way valve assembly is used to open and close the air hole so that the high-pressure gas flows in one direction in the gas channel 3 to the reverse circulation hammer. If the sealing performance of the check valve assembly inside the reverse circulation hammer is poor, under the action of the one-way valve assembly, the air channel of the reverse circulation hammer will not be directly connected to the atmosphere, preventing the mixture from entering the rear air chamber of the reverse circulation hammer through the air channel, thereby avoiding the piston getting stuck. It can be seen that compared with the prior art, the reverse circulation anti-blocking device in the embodiment of the utility model is suitable for working conditions with deep drilling and large water volume, and can increase the sealing performance of the air channel in the reverse circulation impactor to avoid the piston getting stuck.

[0055] It should be noted that the "front end" in this application refers to the end of the connecting sleeve 2 close to the down-the-hole impactor, that is, the high-pressure gas flows toward the front end in the reverse circulation anti-blocking device, and the "rear end" in this application refers to the end of the connecting sleeve 2 away from the down-the-hole impactor.

[0056] In the above structure, the baffle 4 and the connecting sleeve 2 in the embodiment of the present invention are specifically an integrally formed structure.

[0057] In the above structure, as one of the specific embodiments, the connection assembly in the embodiment of the present invention includes a first positioning ring 51, a positioning sleeve 52 and an air passage 53, wherein the first positioning ring 51 is arranged on the inner wall of the front end of the connection sleeve 2, and the first positioning ring 51 and the connection sleeve 2 are detachably connected, the positioning sleeve 52 is fixedly arranged on the outside of the slag discharge pipe 1, and the front end face of the positioning sleeve 52 abuts against the rear end face of the first positioning ring 51, which is used to position the positioning sleeve 52 and the slag discharge pipe 1, and the positioning sleeve 52 is provided with an air passage 53, which is arranged along the axial direction of the positioning sleeve 52, and the air passage 53 is used to supply the high-pressure gas channel 3. When the high-pressure gas is connected, the one-way valve assembly is pushed to open the air hole, and the high-pressure gas enters the air channel between the connection sleeve 2 and the slag discharge pipe 1 through the air hole, and can enter the inside of the down-the-hole impactor through the air passage 53 on the positioning sleeve 52.

[0058] More specifically, as one of the embodiments, the outer surface of the slag discharge pipe 1 in the embodiment of the utility model is provided with a positioning groove, and the positioning sleeve 52 is inserted into the positioning groove. The positioning sleeve 52 is positioned by the positioning groove, and the slag discharge pipe 1 and the positioning sleeve 52 are specifically detachably connected, so that assembly is convenient.

[0059] As a more specific embodiment, the positioning sleeve 52 in the embodiment of the present invention includes a positioning member 521 and a fastening ring 524, wherein at least two positioning members 521 are provided, and the outer surface of the positioning member 521 is provided with a ring groove. The positioning members 521 are connected end to end to form an annular structure, and the middle part of the annular structure forms a mounting opening 522. The inner diameter of the mounting opening 522 is adapted to the outer diameter of the positioning groove. The outer side of the annular structure forms an annular groove. The fastening ring 524 is sleeved in the annular groove to fix the annular structure in the positioning groove. The split structure facilitates the installation and removal of the positioning sleeve 52 and the slag discharge pipe 1.

[0060] As one implementation manner, the fastening ring 524 in the embodiment of the present invention is specifically an O-ring.

[0061] Furthermore, the air passage 53 is arranged on the annular structure. For ease of processing, the air passage 53 is arranged on the outer surface of the annular structure, and the first positioning ring 51 cannot completely cover the air passage 53 so that gas can flow through the air passage 53.

[0062] Furthermore, as a more specific embodiment, at least two air passages 53 are provided in the embodiment of the present invention, and are spaced apart circumferentially around the annular channel. Specifically, preferably, four air passages 53 are provided in the embodiment provided in the present application.

[0063] In the above structure, as one embodiment, to facilitate the assembly and disassembly of the first locating ring 51, a mounting ring groove is provided on the inner wall of the connecting sleeve 2 in the embodiment of the present invention. The first locating ring 51 is specifically an annular positioning member with an opening. When installing the first locating ring 51, the outer diameter of the first locating ring 51 can be reduced under the action of an external force and placed in the mounting ring groove of the connecting sleeve 2. The external force is removed and the first locating ring 51 is snapped into the mounting ring groove. Specifically, the first locating ring 51 in the embodiment of the present invention is specifically a retaining spring and is specifically made of spring steel.

[0064] In the above structure, as one of the embodiments, the one-way valve assembly in the embodiment of the present utility model includes: a valve stem 61, a second positioning ring 62 and an elastic member 63, wherein the valve stem 61 is sleeved on the valve stem 61 on the outside of the slag discharge pipe 1, and the valve stem 61 includes a sealing section and a guide section connected in sequence, and the rear end face of the sealing section is used to cooperate with the air hole; the second positioning ring 62 is fixedly arranged on the outside of the slag discharge pipe 1, and the second positioning ring 62 is arranged at the front end of the valve stem 61; the elastic member 63 is sleeved on the outside of the guide section, and the two ends of the elastic member 63 respectively abut the second positioning ring 62 and the front end face of the sealing section.

[0065] When high-pressure gas is connected, the high-pressure gas acts on the valve stem 61, pushing the valve stem 61 to move toward the second positioning ring 62, compressing the elastic member 63 so that the elastic member 63 is elastically deformed. At this time, the rear end face of the blocking section is separated from the baffle 4 to open the pore. When the high-pressure gas stops being input, the elastic member 63 produces elastic reset deformation, pushing the valve stem 61 to move toward the baffle 4, so that the rear end face of the blocking section contacts the baffle 4, so as to close the pore, thereby realizing a one-way flow of high-pressure gas from the rear end to the front end.

[0066] Furthermore, as one of the embodiments, the second positioning ring 62 in the embodiment of the utility model is specifically a retaining spring, the second positioning ring 62 and the slag discharge pipe 1 are detachably connected, an annular groove is provided on the outside of the slag discharge pipe 1, the second positioning ring 62 is specifically an annular positioning part with an opening, and the second positioning ring 62 is clamped in the annular groove.

[0067] Furthermore, as one of the implementation methods, the one-way valve assembly in the embodiment of the present invention also includes a sealing member 64, which is fixedly arranged on the rear end face of the valve stem 61. The sealing member 64 is made of rubber material. The sealing member 64 is specifically a conical structure. The outer diameter of the sealing member 64 gradually increases from the sealing section to the guide section. With this arrangement, the sealing member 64 can better fit the inner wall of the pore and have a better sealing effect.

[0068] Furthermore, as one implementation method, the air hole in the embodiment of the present invention is specifically a tapered hole, and the shape of the inner wall of the air hole is adapted to the shape of the blocking member 64.

[0069] Furthermore, as one specific implementation method, the elastic member 63 in the embodiment of the present invention is specifically a spring.

[0070] Furthermore, the slag discharge pipe 1 in the embodiment of the present invention is used to discharge the residue at the bottom of the hole. The airway is provided between the connecting sleeve 2 and the slag discharge pipe 1. In order to avoid leakage of high-pressure gas in the airway, as one embodiment, the slag discharge pipe 1 in the embodiment of the present invention is provided with a first sealing ring groove 11 on the inner wall of the front end, a positioning step 12 is provided inside the slag discharge pipe 1, and a second sealing ring groove 13 is provided on the outer wall of the rear end of the slag discharge pipe 1. The first sealing ring groove 11 and the second sealing ring groove 13 are both matched with sealing rings to maintain the sealing performance of the connection parts at both ends.

[0071] The present application also provides a reverse circulation drilling rig, comprising a drill rod, a down-the-hole hammer and a reverse circulation anti-blocking device, wherein the reverse circulation anti-blocking device is arranged between the drill rod and the down-the-hole hammer; or, the reverse circulation anti-blocking device is arranged between two adjacent drill rods.

[0072] Furthermore, the drill pipe includes an inner tube and an outer tube, wherein the inner tube is used to be connected to the slag discharge pipe 1 for slag discharge, and the outer tube is used to be connected to the connecting sleeve 2.

[0073] More specifically, a tapered external thread is provided on the outer wall of the front end of the connecting sleeve 2 in the embodiment of the present invention, which is used to connect to the outer tube of the front drill pipe or the joint assembly of the reverse circulation impactor, and a tapered internal thread is provided on the inner wall of the rear end of the connecting sleeve 2, which is used to connect to the outer tube of the rear end drill pipe.

[0074] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A reverse circulation anti-blocking device, characterized in that: include: A slag discharge pipe (1) having a slag discharge channel therein; A connecting sleeve (2) is sleeved on the outside of the slag discharge pipe (1) and connected to the slag discharge pipe (1) via a connecting assembly, a gas channel (3) is formed between the slag discharge pipe (1), the connecting assembly and the connecting sleeve (2), a baffle (4) is provided on the inner wall of the connecting sleeve (2), and an air hole is formed between the baffle (4) and the slag discharge pipe (1); A one-way valve assembly is provided between the connecting sleeve (2) and the slag discharge pipe (1), and the one-way valve assembly is used to open and close the air hole to allow high-pressure gas to flow in one direction in the gas channel (3).

2. The reverse circulation anti-blocking device according to claim 1, characterized in that: The connection component includes: a first positioning ring (51) provided on the inner wall of the front end of the connecting sleeve (2), the first positioning ring (51) being detachably connected to the connecting sleeve (2); A positioning sleeve (52) is fixedly arranged on the outside of the slag discharge pipe (1), wherein the front end surface of the positioning sleeve (52) abuts against the rear end surface of the first positioning ring (51) for positioning; An air passage (53) is arranged along the axial direction of the positioning sleeve (52).

3. The reverse circulation anti-blocking device according to claim 2, characterized in that: The outer surface of the slag discharge pipe (1) is provided with a positioning groove, the positioning sleeve (52) is sleeved in the positioning groove, and the positioning sleeve (52) and the slag discharge pipe (1) are specifically detachably connected.

4. The reverse circulation anti-blocking device according to claim 3, characterized in that: The positioning sleeve (52) comprises: Positioning members (521), at least two positioning members (521) are provided, annular grooves are provided on the outer sides of the positioning members (521), the positioning members (521) are connected end to end in an annular structure, a mounting opening (522) is formed in the middle of the annular structure, the inner diameter of the mounting opening (522) is adapted to the outer diameter of the positioning groove, and an annular groove is formed on the outer side of the annular structure; A fastening ring (524) is sleeved in the annular groove to fix the annular structure outside the positioning groove.

5. The reverse circulation anti-blocking device according to claim 4, characterized in that: At least two air passages (53) are provided, and the air passages (53) are arranged at intervals in the circumferential direction around the annular structure.

6. The reverse circulation anti-blocking device according to claim 2, characterized in that: An installation ring groove is provided on the inner wall of the connecting sleeve (2); the first positioning ring (51) is specifically an annular positioning member with an opening; the first positioning ring (51) is detachably connected to the installation ring groove.

7. The reverse circulation anti-blocking device according to any one of claims 1 to 6, characterized in that: The one-way valve assembly comprises: a valve stem (61) sleeved on the outside of the slag discharge pipe (1), the valve stem comprising a blocking section and a guide section connected in sequence, the rear end face of the blocking section being used in conjunction with the air hole; a second positioning ring (62) fixedly arranged on the outside of the slag discharge pipe (1), wherein the second positioning ring (62) is arranged at the front end of the valve stem (61); An elastic member (63) is sleeved on the outside of the guide section, and two ends of the elastic member (63) respectively abut against the second positioning ring (62) and the front end surface of the blocking section.

8. The reverse circulation anti-blocking device according to claim 7, characterized in that: The one-way valve assembly further includes: A blocking piece (64) is provided on the rear end surface of the blocking section, wherein the blocking piece (64) is made of a rubber material, and the outer diameter of the blocking piece (64) gradually increases in a direction from the blocking section to the guide section.

9. The reverse circulation anti-blocking device according to any one of claims 1 to 6, characterized in that: A first sealing ring groove (11) is provided on the inner wall of the front end of the slag discharge pipe (1), a positioning step (12) is provided inside the slag discharge pipe (1), and a second sealing ring groove (13) is provided on the outer wall of the rear end of the slag discharge pipe (1).

10. A reverse circulation drilling rig, characterized in that: It comprises a drill pipe, a down-the-hole hammer and a reverse circulation anti-blocking device according to any one of claims 1 to 9; in, The reverse circulation anti-blocking device is arranged between the drill rod and the down-the-hole hammer; or, The reverse circulation anti-blocking device is arranged between two adjacent drill rods.

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