Reverse circulation impactor

Abstract

The utility model discloses a reverse circulation impactor which comprises a drill bit, a reverse circulation impactor body and a reverse circulation impactor body. The central channel is arranged in the drill bit and is communicated with the slag discharge port; the collecting pipe is arranged at the end, away from the slag discharging opening, of the drill bit, a connecting pipe is arranged on the collecting pipe, the connecting pipe and the collecting pipe are detachably and fixedly connected through a connecting assembly, and the connecting pipe is slidably arranged in the center channel in a sleeved mode. Compared with the prior art, the reverse circulation impactor provided by the utility model has the advantages that the maintenance cost can be reduced, and the maintenance efficiency can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of rock drilling, and more specifically, to a reverse circulation impactor. Background Art

[0002] In recent years, as my country continues to increase its investment in infrastructure and various types of mines, pneumatic down-the-hole impactors have received great attention in the field of rock crushing machinery technology due to their simple structure, easy operation, easy maintenance, effective removal of rock cuttings at the bottom of the well, no restrictions on drilling depth, and reduced wear of drill tools.

[0003] The pneumatic down-the-hole impactor uses high-pressure air as a power source to drive the piston in the impactor to reciprocate at high speed and high frequency, so that the piston obtains enough energy to impact the rotating drill bit for more efficient drilling operations. The impact force acts on the drill bit in the form of stress waves, generating huge impact energy in a very short time, which can effectively break the rock and quickly form a hole to achieve the purpose of rock drilling.

[0004] The reverse circulation impactor uses the high-pressure gas discharged after the piston works to blow the broken rock debris from the bottom of the drill hole to the center hole of the drill bit and the collection tube for collection. However, the current reverse circulation impactor has the following problems during use:

[0005] At present, the front end of the collection tube is inserted into the center hole of the drill bit. When collecting the crushed rock debris, the mouth of the inner hole of the front end of the collection tube is worn by the rock debris quickly, and the mouth of the collection tube is prone to wear and cracking failure, which seriously affects the service life of the entire collection tube. At present, when the wear and cracking problem of the mouth of the collection tube occurs, the collection tube is often replaced in time, but the removal of the collection tube is relatively complicated, the maintenance cost is high, and the maintenance efficiency is low.

[0006] Therefore, there is an urgent need for a reverse circulation impactor that can reduce maintenance costs and improve maintenance efficiency. Utility Model Content

[0007] In order to solve the above technical problems, the present application provides a reverse circulation impactor, which can reduce maintenance costs and improve maintenance efficiency.

[0008] The technical solutions provided by this application are as follows:

[0009] A reverse circulation impactor, comprising:

[0010] A drill bit, wherein the rock breaking end of the drill bit is provided with a slag discharge port;

[0011] A central channel disposed in the drill bit and communicating with the slag discharge port;

[0012] A collection pipe is arranged at one end of the drill bit away from the slag discharge port, and a connecting pipe is arranged on the collection pipe. The connecting pipe is detachably fixedly connected to the collection pipe through a connecting assembly, and the connecting pipe can be slidably sleeved in the central channel.

[0013] Preferably, the connection assembly comprises:

[0014] A first groove is provided on the outer surface of the connecting pipe, wherein the first groove is recessed from the outer surface of the connecting pipe toward the axis direction of the connecting pipe;

[0015] A second groove is arranged on the inner surface of the collection tube and is arranged corresponding to the first groove, wherein the second groove is recessed from the inner side of the collection tube toward a direction away from the axis of the collection tube;

[0016] A connecting piece is arranged between the first groove and the second groove, and the connecting piece is used to connect the collection tube and the connecting tube.

[0017] Preferably, the length of the second groove is greater than the length of the first groove.

[0018] Preferably, the connecting member is a rubber ring, the rubber ring is configured to be able to generate elastic deformation, and there is an interference fit between the rubber ring and the first groove, and between the rubber ring and the second groove.

[0019] Preferably, the cross-sectional shape of the connecting piece is circular or square.

[0020] Preferably, in a direction close to the drill bit, a first connecting section, a first guiding section and a positioning step are sequentially arranged along the axial direction of the connecting tube, the outer diameters of the first connecting section, the first guiding section and the positioning step are increased, the first groove is arranged in the first connecting section, and the front end surface of the collection tube abuts against the positioning step;

[0021] Towards the direction approaching the drill bit, a positioning boss, a second connecting section and a second guide section are sequentially arranged along the axis of the collection tube, the second groove is arranged on the second connecting section, the first guide section is used in conjunction with the second guide section, and the rear end face of the connecting tube abuts against the positioning boss.

[0022] Preferably, there is a clearance fit between the collecting tube and the central channel, and the outer diameter of the positioning step is not greater than the outer diameter of the collecting tube.

[0023] Preferably, at least two groups of the connection components are provided, and the connection components are arranged at intervals along the axial direction of the connection pipe.

[0024] Preferably, it also includes:

[0025] A wear-resistant coating is provided on the inner surface of the connecting pipe and the front end surface of the connecting pipe.

[0026] The reverse circulation impactor provided by the utility model is provided with a drill bit, a central channel and a collection pipe, wherein the rock breaking end of the drill bit is provided with a slag discharge port, the central channel is provided in the drill bit, and the central channel is used to communicate with the slag discharge port, the collection pipe is provided at the rear end of the drill bit away from the slag discharge port, and a connecting pipe is provided at the front end of the collection pipe, the connecting pipe and the collection pipe are detachably connected through a connecting assembly, and the connecting pipe can be slidably mounted in the central channel. When the reverse circulation impactor is drilling, the rock debris at the bottom of the hole enters the central channel through the slag discharge port, and enters the connecting pipe through the central channel, and is discharged along the collection pipe. The collection pipe of the reverse circulation impactor in the prior art is an integrated structure, and the rock debris enters the collection pipe from the central channel, which will cause wear on the end face and inner surface of the collection pipe, thereby affecting the service life of the collection pipe. When the collection pipe is worn to a certain extent, the collection pipe needs to be replaced, and the disassembly and assembly of the collection pipe is relatively complicated, which increases the use cost of the reverse circulation impactor. The reverse circulation impactor provided by the present application has a connecting pipe at the front end of the collection pipe, and the connecting pipe is detachably connected to the collection pipe. The rock slag enters the collection pipe through the connecting pipe. When the connecting pipe is worn to a certain extent, the connecting pipe is replaced. Compared with replacing the entire collection pipe, it is more convenient to replace only the connecting pipe, and the maintenance cost is also reduced. It can be seen that compared with the prior art, the reverse circulation impactor in the embodiment of the utility model can reduce maintenance costs and improve maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 paying creative work.

[0028] Figure 1 A schematic diagram of the structure of a reverse circulation impactor provided by the prior art;

[0029] Figure 2 A schematic diagram of the structure of a reverse circulation impactor provided in an embodiment of the utility model;

[0030] Figure 3 Another structural schematic diagram of the reverse circulation impactor provided in the embodiment of the utility model;

[0031] Figure 4 for Figure 3 A partial enlarged view of

[0032] Figure 5 A partial enlarged view of the collection tube provided in the embodiment of the utility model;

[0033] Figure 6 A structural diagram of a connecting pipe provided in an embodiment of the utility model.

[0034] Figure numerals: Prior art: 001, existing drill bit; 002, existing collection tube; 003, piston; 004, outer cylinder; 005, inner cylinder; 006, clamping ring; 007, clamping drill sleeve;

[0035] The present application: 1. drill bit; 11. center channel; 2. collection tube; 3. connecting tube; 41. first groove; 42. second groove; 43. connecting piece; 31. first connecting section; 32. first guide section; 33. positioning step; 21. positioning boss; 22. second connecting section; 23. second guide section. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to 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 described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0037] 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.

[0038] 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 drawings, and are only for the convenience of describing the present 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 should not be understood as a limitation on the present application.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0040] 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 effects and purposes that can be achieved by this application.

[0041] The embodiments of the present invention are written in a progressive manner.

[0042] like Figures 2 to 6 As shown, an embodiment of the utility model provides a reverse circulation impactor, comprising: a drill bit 1, wherein the rock breaking end of the drill bit 1 is provided with a slag discharge port; a central channel 11 arranged in the drill bit 1 and connected to the slag discharge port; a collection pipe 2 arranged at an end of the drill bit 1 away from the slag discharge port, wherein a connecting pipe 3 is arranged on the collection pipe 2, wherein the connecting pipe 3 is detachably and fixedly connected to the collection pipe 2 via a connecting assembly, and the connecting pipe 3 can be slidably inserted into the central channel 11.

[0043] Please Figure 1 As shown, the existing collection pipe of the reverse circulation impactor in the prior art is an integrated structure. Rock debris enters the existing collection pipe 002 from the existing drill bit 001, which will cause wear of the end face of the existing collection pipe 002 and the inner surface close to the existing drill bit 001, thereby affecting the service life of the existing collection pipe. When the existing collection pipe 002 is worn to a certain extent, it is necessary to replace the existing collection pipe 002. The disassembly and assembly of the existing collection pipe 002 is relatively complicated, and the maintenance efficiency is low, which increases the maintenance cost and use cost of the reverse circulation impactor.

[0044] Specifically, the existing reverse circulation impactor includes an outer cylinder 004, an inner cylinder 005, a piston 003, a clamping ring 006 and a clamping sleeve 007, wherein both ends of the existing collection tube 002 are fixedly connected to the outer cylinder, the piston 003 is slidably sleeved on the outer side of the existing collection tube 002, the inner cylinder 005 is sleeved on the outer side of the piston 003, the piston 003 and the inner cylinder 005 are slidably connected, the outer cylinder 004 is sleeved on the outer side of the inner cylinder 005, and the inner cylinder 005 and the outer cylinder 004 are relatively fixed, the clamping ring 006 is fixedly arranged on the inner surface of the outer cylinder 004, and the clamping ring 006 and the inner cylinder 00 5 is abutted against the front end surface, a positioning groove is provided on the outer surface of the existing drill bit 001, the positioning groove cooperates with the retaining ring 006 to limit the axial displacement of the drill bit, the drill sleeve 007 is provided at the front end of the retaining ring 006, and the drill sleeve 007 is connected to the outer cylinder 004 by a threaded connection, and the drill sleeve 007 is connected to the existing drill bit 001 by a spline transmission. In the prior art, when the existing collection tube needs to be replaced, both ends of the existing collection tube 002 need to be dismantled and replaced as a whole, which has high maintenance cost on the one hand and low efficiency in disassembly and assembly of the existing collection tube 002 on the other hand.

[0045] The reverse circulation impactor provided by the utility model is firstly provided with a drill bit 1, a central channel 11 and a collection pipe 2, wherein the rock breaking end of the drill bit 1 is provided with a slag discharge port, the central channel 11 is provided in the drill bit 1, and the central channel 11 is used to communicate with the slag discharge port, the collection pipe 2 is provided at the rear end of the drill bit 1 away from the slag discharge port, and the front end of the collection pipe 2 is provided with a connecting pipe 3, the connecting pipe 3 and the collection pipe 2 are detachably connected through a connecting assembly, and the connecting pipe 3 can be slidably sleeved in the central channel 11. When the reverse circulation impactor is performing drilling operations, the rock slag at the bottom of the hole enters the central channel 11 through the slag discharge port, and enters the connecting pipe 3 through the central channel 11, and is discharged along the collection pipe 2. The reverse circulation impactor provided by the present application has a connecting pipe 3 at the front end of the collection pipe 2, and the connecting pipe 3 is detachably connected to the collection pipe 2. The rock slag enters the collection pipe 2 through the connecting pipe 3. When the connecting pipe 3 is worn to a certain extent, the connecting pipe 3 is replaced. Compared with replacing the entire collection pipe 2, it is more convenient to replace only the connecting pipe 3, and the maintenance cost is also reduced. It can be seen that compared with the prior art, the reverse circulation impactor in the embodiment of the utility model can reduce maintenance costs and improve maintenance efficiency.

[0046] The reverse circulation impactor provided in the present application has a detachable connection between the collection pipe 2 and the connecting pipe 3 via a connecting assembly. When the connecting pipe 3 is worn and needs to be replaced while the collection pipe 2 can continue to work, only this end of the drill bit 1 needs to be removed to replace the connecting pipe 3.

[0047] In the above structure, the connecting tube 3 and the collecting tube 2 are detachably connected via a connecting assembly. As one specific implementation method, the connecting assembly in the embodiment of the utility model includes a first groove 41, a second groove 42 and a connecting member 43, wherein the first groove 41 is arranged on the outer surface of the connecting tube 3, and the first groove 41 is recessed from the outer surface of the connecting tube 3 toward its axial direction, the second groove 42 is arranged on the inner surface of the collecting tube 2, and the second groove 42 is recessed away from the axial direction of the collecting tube 2, the second groove 42 is arranged corresponding to the first groove 41, and the connecting member 43 is arranged between the first groove 41 and the second groove 42, and the connecting member 43 is used to connect the collecting tube 2 and the connecting tube 3.

[0048] In the above structure, as one of the implementation modes, the length of the second groove 42 in the embodiment of the utility model is greater than the length of the first groove 41, which facilitates the removal of the connecting tube 3 and the collecting tube 2.

[0049] Specifically, as a first embodiment, the connecting piece 43 in the embodiment of the utility model is specifically a connecting glue. The connecting glue is injected between the first groove 41 and the second groove 42, and the collection tube 2 and the connecting tube 3 are fixedly connected by the connecting glue. When the connecting tube 3 needs to be replaced, the connecting tube 3 is removed from the collection tube 2 by external force, and the new connecting tube 3 continues to be connected to the collection tube 2 by the connecting glue.

[0050] As a second embodiment, the connecting piece 43 in the embodiment of the utility model is specifically a rubber ring, which is configured to be able to produce elastic deformation, the inner ring of the rubber ring is placed in the first groove 41, the outer ring of the rubber ring is placed in the second groove 42, and there is an interference fit between the rubber ring and the first groove 41, and between the rubber ring and the second groove 42. During assembly, the rubber ring is first installed in the first groove 41 of the connecting tube 3, and the connecting tube 3 is inserted into the collection tube 2. Under the action of external force, the rubber ring produces elastic deformation, and when the rubber ring moves to the second groove 42, the rubber ring produces elastic reset deformation, and the outer side of the rubber ring is inserted into the second groove 42, so that the connecting tube 3 and the collection tube 2 are connected and fixed.

[0051] Furthermore, as one of the implementation modes, when the rubber ring in the embodiment of the utility model does not produce elastic shape, the inner diameter of the rubber ring is smaller than the outer diameter of the first groove 41. By causing the rubber ring to produce elastic deformation so that the inner diameter of the rubber ring is enlarged, the rubber ring is inserted into the first groove 41 of the connecting pipe 3. At this time, the rubber ring and the first groove 41 are in interference fit.

[0052] Furthermore, the cross-sectional height of the rubber ring is greater than the sum of the depths of the first groove 41 and the second groove 42. When the rubber ring is stuck in the second groove 42, there is an interference fit between the rubber ring and the second groove 42, thereby preventing relative rotation between the connecting tube 3 and the collecting tube 2.

[0053] Furthermore, as one implementation mode, the cross-sectional shape of the connecting member 43 in the embodiment of the utility model is specifically circular or square.

[0054] Furthermore, if Figure 5 and Figure 6 As shown, as one of the implementation modes, the reverse circulation impactor in the embodiment of the utility model is provided with a first connecting section 31, a first guide section 32 and a positioning step 33 in sequence along the axial direction of the connecting pipe 3 in the direction approaching the drill bit 1, the outer diameters of the first connecting section 31, the first guide section 32 and the positioning step 33 are increased, the first groove 41 is provided in the first connecting section 31, and the front end face of the collection pipe 2 abuts against the positioning step; in the direction approaching the drill bit 1, a positioning boss 21, a second connecting section 22 and a second guide section 23 are provided in sequence along the axis of the collection pipe 2, the second groove 42 is provided on the second connecting section 22, the first guide section 32 is used for cooperation with the second guide section 23, and the rear end face of the connecting pipe 3 abuts against the positioning boss 21.

[0055] The positioning step 33 abuts against the front end surface of the collection tube 2, and the positioning boss 21 abuts against the rear end surface of the connecting tube 3, so as to position the connecting tube 3 in the axial direction. The first groove 41 and the second groove 42 are used in conjunction with each other, and the connecting piece 43 is arranged in the first groove 41 and the second groove 42, so as to connect the connecting tube 3 and the collection tube 2. The connecting tube 3 is positioned in the radial direction by the cooperation of the first guide section 32 and the second guide section 23.

[0056] Furthermore, as one of the implementation modes, the collection tube 2 in the embodiment of the utility model is clearance-matched with the central channel 11 , and the outer diameter of the positioning step 33 is not greater than the outer diameter of the collection tube 2 .

[0057] Furthermore, as one of the embodiments, only one group of connecting components can be provided. Based on the need for connection between the connecting tube 3 and the collection tube 2, the length of the connecting piece 43 can be adjusted. The longer the length of the connecting piece 43 is, the stronger the connection strength between the connecting tube 3 and the collection tube 2 is. If the length of the connecting piece 43 is shorter, the connection strength between the connecting tube 3 and the collection tube 2 is weaker.

[0058] Furthermore, at least two groups of connection components may be provided, and the connection components are arranged at intervals along the axial direction of the connection pipe 3. The connection strength between the connection pipe 3 and the collection pipe 2 may also be enhanced by providing multiple groups of connection components.

[0059] Furthermore, as one of the implementation modes, the material of the connecting tube 3 in the embodiment of the utility model can be selected to be the same as the material of the collecting tube 2, and the service life of the entire collecting tube 2 can be increased by replacing the connecting tube 3, thereby reducing the cost.

[0060] More preferably, the connecting pipe 3 is more susceptible to wear than the collecting pipe 2. In order to reduce the replacement cost of the connecting pipe 3, as a preferred embodiment, the connecting pipe 3 in the embodiment of the utility model is more wear-resistant than the collecting pipe 2. There are many ways to increase the wear resistance of the connecting pipe 3. Specifically, the connecting pipe 3 can be made of wear-resistant materials as a whole, such as ceramic materials, silicon nitride, wear-resistant chromium cast iron series, and wear-resistant alloy steel series. It is also possible to plate a wear-resistant coating on the end face and inner surface of the connecting pipe 3. Compared with the use of wear-resistant materials as a whole, this method is less expensive. In addition, the wear resistance of the connecting pipe 3 can also be improved by heat treating the connecting pipe 3.

[0061] Preferably, the reverse circulation impactor in the embodiment of the utility model also includes a wear-resistant coating, which is arranged on the inner surface of the connecting pipe 3 and the front end surface of the connecting pipe 3, so as to improve the wear resistance of the connecting pipe 3, reduce the replacement frequency of the connecting pipe 3, and reduce the maintenance cost.

[0062] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those 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 will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A reverse circulation impactor, characterized in that: include: A drill bit (1), wherein a rock breaking end of the drill bit (1) is provided with a slag discharge port; A central channel (11) disposed in the drill bit (1) and communicating with the slag discharge port; A collection pipe (2) is arranged at an end of the drill bit (1) away from the slag discharge port, and a connecting pipe (3) is arranged on the collection pipe (2). The connecting pipe (3) and the collection pipe (2) are detachably fixedly connected via a connecting assembly, and the connecting pipe (3) can be slidably sleeved in the central channel (11).

2. The reverse circulation impactor according to claim 1, characterized in that: The connection component comprises: A first groove (41) is provided on the outer surface of the connecting pipe (3) and is recessed in the axial direction of the connecting pipe (3); a second groove (42) provided on the inner surface of the collection tube (2) and recessed in a direction away from the axis of the collection tube (2), the second groove (42) being provided corresponding to the first groove (41); A connecting piece (43) is arranged between the first groove (41) and the second groove (42), and the connecting piece (43) is used to connect the collection tube (2) and the connecting tube (3).

3. The reverse circulation impactor according to claim 2, characterized in that: The length of the second groove (42) is greater than the length of the first groove (41).

4. The reverse circulation impactor according to claim 3, characterized in that: The connecting member (43) is specifically a rubber ring, the rubber ring is configured to be able to generate elastic deformation, and there is an interference fit between the rubber ring and the first groove (41), and between the rubber ring and the second groove (42).

5. The reverse circulation impactor according to claim 4, characterized in that: The cross-sectional shape of the connecting piece (43) is specifically circular or square.

6. The reverse circulation impactor according to claim 2, characterized in that: A first connecting section (31), a first guiding section (32) and a positioning step (33) are sequentially arranged along the axial direction of the connecting tube (3) in a direction close to the drill bit (1); the outer diameters of the first connecting section (31), the first guiding section (32) and the positioning step (33) are increased; the first groove (41) is arranged in the first connecting section (31); and the front end surface of the collection tube (2) abuts against the positioning step (33); A positioning boss (21), a second connecting section (22) and a second guide section (23) are sequentially arranged along the axis of the collection tube (2) in a direction close to the drill bit (1); the second groove (42) is arranged on the second connecting section (22); the first guide section (32) is used in conjunction with the second guide section (23); and the rear end surface of the connecting tube (3) abuts against the positioning boss (21).

7. The reverse circulation impactor according to claim 6, characterized in that: The collection tube (2) and the central channel (11) are clearance-matched, and the outer diameter of the positioning step (33) is not greater than the outer diameter of the collection tube (2).

8. The reverse circulation impactor according to any one of claims 1 to 7, characterized in that: At least two groups of the connection components are provided, and the connection components are arranged at intervals along the axial direction of the connection pipe (3).

9. The reverse circulation impactor according to any one of claims 1 to 7, characterized in that: Also includes: A wear-resistant coating is provided on the inner surface and the front end surface of the connecting pipe (3).

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