A joint and a rock drill hammer

Abstract

The utility model provides a kind of joint and down-the-hole hammer, comprising: body;Center passage is arranged in the body;Slag blowing passage, the air inlet of the slag blowing passage is communicated with the center passage, the exhaust port of the slag blowing passage is arranged on the outer surface of the body, the slag blowing passage is configured as: with the gas distribution structure cooperation of hammer, so that slag blowing passage has open state and closed state, when slag blowing passage is in open state, high-pressure medium in center passage is blown slag by slag blowing passage.Compared with prior art, the joint and down-the-hole hammer provided by the utility model, simple structure, can improve the slagging efficiency, improve drilling speed, reduce drill loss.

Description

Technical Field

[0001] This utility model relates to the field of down-the-hole impactor technology, and in particular to a connector and a down-the-hole impactor. Background Technology

[0002] Down-the-hole (DH) hammers are widely used in drilling operations for infrastructure, wells, mines, hydropower stations, ports, roads, and tunnels. Their working principle is as follows: high-pressure gas supplied by a compressor enters the central channel of the joint through the drill rod, pushing open the check valve and spring installed inside the joint, and enters the front and rear chambers of the piston. This drives the piston to reciprocate at high speed, repeatedly striking the drill bit. The rock is then broken by the alloy teeth at the drill bit's tip. Rock debris generated during this process is discharged from the bottom of the hole through the high-pressure gas after work done in the piston's front and rear chambers, ultimately achieving hole drilling. The check valve and spring control the opening and closing of the high-pressure gas input. When high-pressure gas is supplied to the hammer, the gas pressure pushes the check valve and spring, causing them to open rapidly. When the hammer stops supplying gas, the check valve closes rapidly under the force of the spring, creating a sealed cavity inside the hammer. This prevents rock debris from the bottom of the hole from flowing back into the hammer, causing the piston to jam and malfunction, or damaging internal parts of the hammer.

[0003] During the drilling process with an impactor, when there is a lot of mud and slag at the bottom of the hole, a large amount of water, or a relatively deep drilling depth, the resistance to slag removal will increase, affecting the efficiency of slag removal and thus the drilling speed. At the same time, since the rock slag at the bottom of the hole cannot be removed in time, the rock slag will repeatedly grind the alloy teeth of the drill bit, thereby accelerating the wear of the alloy teeth and ultimately reducing the service life of the drill bit.

[0004] Therefore, there is an urgent need for a connector and a down-the-hole impactor with a simple structure that can improve slag removal efficiency, increase drilling speed, and reduce drill bit wear. Utility Model Content

[0005] To address the technical problems of low slag removal efficiency, low drilling speed, and short drill bit life in existing technologies, this utility model provides a connector and a down-the-hole impactor. These components have a simple structure and can improve slag removal efficiency, increase drilling speed, and reduce drill bit wear.

[0006] A connector, comprising: ontology; A central channel is provided within the main body, and the central channel is used for the passage of high-pressure medium; The slag blowing channel has an air inlet connected to the central channel and an exhaust port located on the outer circumferential surface of the main body. The slag blowing channel is configured to cooperate with the air distribution structure of the impactor so that the slag blowing channel has an open state and a closed state. When the slag blowing channel is in the open state, the high-pressure medium in the central channel blows slag through the slag blowing channel.

[0007] Preferably, the central channel is provided with a gas distribution section, which is used in conjunction with the gas distribution structure to open and close the central channel, and the air inlet of the slag blowing channel is located on the inner wall of the gas distribution section.

[0008] Preferably, the air distribution section has a conical structure, and its inner diameter gradually increases in the direction away from the central channel's air intake end.

[0009] Preferably, it further includes: A plug is detachably connected to the main body and is used to cooperate with the exhaust port of the slag blowing channel to block the slag blowing channel.

[0010] Preferably, the inner wall of the exhaust port of the slag blowing channel is provided with an internal thread, the outer surface of the plug is provided with an external thread, and the plug and the slag blowing channel are connected by threads.

[0011] Preferably, at least two slag blowing channels are provided, and the slag blowing channels are arranged circumferentially around the body.

[0012] Preferably, the slag blowing channel is inclined, and the angle between the axis of the slag blowing channel and the axis of the central channel is 10° to 80°.

[0013] Preferably, the diameter of the slag blowing channel is 4 mm to 20 mm.

[0014] A down-the-hole impactor, comprising: The connector described in any of the above items; The gas distribution structure works in conjunction with the slag blowing channel so that the slag blowing channel can be in an open or closed state. When the slag blowing channel is in the open state, the high-pressure medium in the central channel blows slag through the slag blowing channel.

[0015] Preferably, the gas distribution structure includes: An outer sleeve fitted on the outside of the rear end of the connector and fixedly connected to the connector; A gas distribution seat fixedly installed inside the outer sleeve; A check valve assembly installed on the gas distribution seat for opening and closing the slag blowing channel.

[0016] Compared with the prior art, the connector provided by this utility model includes a body, a central channel, and a slag blowing channel. The central channel is located inside the body and is used for the passage of high-pressure medium. The air inlet of the slag blowing channel is connected to the central channel, and the exhaust port of the slag blowing channel is located on the outer circumferential surface of the body. The slag blowing channel is configured to cooperate with the air distribution structure of the impactor so that the slag blowing channel has an open state and a closed state. When the slag blowing channel is in the open state, the high-pressure medium in the central channel can be blown through the slag blowing channel.

[0017] When no high-pressure medium is introduced into the central channel, the slag blowing channel is closed to prevent external rock debris from entering the impactor and causing jamming or damage to internal parts. When high-pressure medium is introduced into the central channel, the slag blowing channel opens under high pressure, allowing the high-pressure medium in the central channel to blow slag directly through the channel. Since the high-pressure medium does not require work from the piston, it has high pressure, strong slag blowing force, and strong slag blowing capacity. The structure is simple, which can improve slag removal efficiency, increase drilling speed, and reduce drill bit wear.

[0018] This utility model also provides a down-the-hole impactor, including a connector and an air distribution structure, wherein the connector is specifically the aforementioned connector, which can also achieve the technical effects of improving slag removal efficiency, increasing drilling speed, and reducing drill bit wear. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic diagram of a connector provided by this utility model; Figure 2 A schematic diagram of a down-the-hole impactor provided in an embodiment of this utility model (the slag blowing channel is in the closed state). Figure 3 A schematic diagram of a down-the-hole impactor provided in an embodiment of this utility model (with the slag blowing channel in the open state). Figure 4 This is a diagram showing the usage state of the down-the-hole impactor provided in an embodiment of the present utility model.

[0021] Reference numerals: 1. Body; 2. Central channel; 3. Slag blowing channel; 21. Gas distribution section; 4. Plug; 10. Connector; 20. Outer sleeve; 30. Gas distribution seat; 40. Check valve; 50. Elastic element; 60. Inner sleeve; 70. Piston; 80. Drill bit. Detailed Implementation

[0022] 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 a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly set on the other component; when a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to the other component.

[0024] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0025] like Figures 1 to 4 As shown in the figure, where the arrows indicate the direction of gas flow, this utility model provides a connector, including: a body 1; a central channel 2, disposed within the body 1, the central channel 2 being used for the passage of high-pressure medium; and a slag blowing channel 3, the air inlet of the slag blowing channel 3 being connected to the central channel 2, and the exhaust port of the slag blowing channel 3 being disposed on the outer circumferential surface of the body 1. The slag blowing channel 3 is configured to cooperate with the gas distribution structure of the impactor so that the slag blowing channel 3 has an open state and a closed state. When the slag blowing channel 3 is in the open state, the high-pressure medium in the central channel 2 is blown through the slag blowing channel 3.

[0026] In existing down-the-hole hammers, high-pressure gas supplied by a compressor enters the central channel of the joint through the drill pipe. This gas pushes open the check valve and spring installed inside the joint, entering the front and rear chambers of the piston. This drives the piston to reciprocate at high speed. The piston's reciprocating motion repeatedly strikes the drill bit, ultimately breaking the rock through the alloy teeth at the drill bit's tip. During the rock-breaking process, rock debris is generated and discharged from the bottom of the hole through the high-pressure gas after it has done work in the front and rear chambers of the piston, thus achieving the drilling and hole formation. The check valve and spring control the opening and closing of the high-pressure gas input. When high-pressure gas is input into the hammer, the gas pressure pushes the check valve and spring, causing them to open rapidly. When the hammer stops supplying gas, the check valve closes rapidly under the force of the spring, forming a sealed cavity inside the hammer. This prevents rock debris from the bottom of the hole from flowing back into the hammer, which could cause the piston to jam and malfunction, or damage the internal parts of the hammer.

[0027] In existing impactors, the high-pressure gas discharged after the piston in the front and rear chambers performs work enters the drill bit tail hole, and then blows the rock cuttings from the bottom of the hole into the annular channel between the outer wall of the impactor and the rock wall of the hole through the drill bit's slag discharge hole, and finally blows them out of the hole. Since the gas flow used for slag blowing is the exhaust gas after the piston performs work, its gas pressure is much lower than the high-pressure gas input to the joint, resulting in a small slag blowing force. At the same time, the annular channel between the outer wall of the impactor and the rock wall of the hole is narrow, resulting in a large slag discharge resistance. When the rock cuttings are blown from the narrow channel to the impactor joint, the loss of slag blowing gas pressure makes slag blowing difficult, especially when there is a lot of mud and slag at the bottom of the hole, a large amount of water, or a large drilling depth.

[0028] During the drilling process with an impactor, when there is a lot of mud and slag at the bottom of the hole, a large amount of water, or a relatively deep drilling depth, the resistance to slag removal will increase, affecting the efficiency of slag removal and thus the drilling speed. At the same time, since the rock slag at the bottom of the hole cannot be removed in time, the rock slag will repeatedly grind the alloy teeth of the drill bit, thereby accelerating the wear of the alloy teeth and ultimately reducing the service life of the drill bit.

[0029] To solve the above-mentioned technical problems, the connector provided by this utility model includes a body 1, a central channel 2, and a slag blowing channel 3. The central channel 2 is disposed inside the body 1 and is used to allow high-pressure medium to pass through. The air inlet of the slag blowing channel 3 is connected to the central channel 2, and the exhaust port of the slag blowing channel 3 is disposed on the outer circumferential surface of the body 1. The slag blowing channel 3 is configured to cooperate with the air distribution structure of the impactor so that the slag blowing channel 3 has an open state and a closed state. When the slag blowing channel 3 is in the open state, the high-pressure medium in the central channel 2 can be blown through the slag blowing channel 3.

[0030] When no high-pressure medium is introduced into the central channel 2, the slag blowing channel 3 is closed to prevent external rock debris from entering the impactor and causing jamming or damage to internal parts. When high-pressure medium is introduced into the central channel 2, the slag blowing channel 3 opens under high pressure, allowing the high-pressure medium in the central channel 2 to blow slag directly through the slag blowing channel 3. Since the high-pressure medium does not require work from the piston, it has high pressure, strong slag blowing force, and strong slag blowing capacity. The structure is simple, which can improve slag discharge efficiency, increase drilling speed, and reduce drill bit wear.

[0031] Compared with the existing structure, the present technical solution opens a slag blowing channel 3 on the joint. The other structures are the same as those of the impactor in the existing technology. The improvement is small and the structure is simple. When the high-pressure medium is input into the central channel 2, the high-pressure medium pushes the gas distribution structure to move downward, opening the slag blowing channel 3 and the central channel 2. The high-pressure medium that has not done work can be blown directly to the outside of the impactor through the slag blowing channel 3, realizing secondary slag discharge of the rock slag flowing through the outer wall of the joint, thereby improving the slag discharge efficiency of the impactor, increasing the drilling speed, and reducing drill bit wear.

[0032] In this embodiment of the invention, the connector of the down-the-hole impactor is connected to an air compressor, and the high-pressure medium is specifically compressed air. In other products, the high-pressure medium can also be hydraulic oil.

[0033] In the above structure, as one embodiment, the central channel 2 of this utility model is provided with a gas distribution section 21. The gas distribution section 21 is used in conjunction with the gas distribution structure to open and close the central channel 2. The air inlet of the slag blowing channel 3 is located on the inner wall of the gas distribution section 21. When a high-pressure medium is input into the central channel 2, the gas distribution structure is opened under the action of the high-pressure medium. Part of the high-pressure medium enters the impactor for drilling, and part of the high-pressure medium blows slag through the slag blowing channel 3.

[0034] Furthermore, as a specific implementation, the gas distribution section 21 in this embodiment of the present invention has a conical structure. The inner diameter of the gas distribution section 21 gradually increases in the direction away from the air inlet end of the central channel 2. The check valve 40 in the gas distribution structure is provided with a sealing surface that is compatible with the gas distribution section 21. When no high-pressure medium is input into the central channel 2, the check valve 40 can better close the central channel 2 and the slag blowing channel 3, preventing external impurities from entering the impactor.

[0035] When the down-the-hole hammer is operating normally and the slag removal effect is good, if the slag blowing channel 3 is still open, it will cause the loss of high-pressure medium, increase the use cost of the down-the-hole hammer, and cause a lot of waste. As a preferred embodiment, the connector in this utility model embodiment also includes a plug 4. The plug 4 is detachably connected to the body 1. The plug 4 is used to cooperate with the exhaust port of the slag blowing channel 3 to seal the slag blowing channel 3. When the operating conditions are normal and the slag removal effect is good, the plug 4 is installed at the exhaust port of the slag blowing channel 3. When there is a lot of mud and slag at the bottom of the hole, a large amount of water, or a relatively large drilling depth, the slag removal resistance will increase and the drilling slag removal efficiency will be low. In this case, the plug 4 is removed and slag is assisted by blowing through the slag blowing channel 3.

[0036] More specifically, in this embodiment of the invention, the inner wall of the exhaust port of the slag blowing channel 3 is provided with an internal thread, the outer surface of the plug 4 is provided with an external thread, and the plug 4 and the slag blowing channel 3 are connected by threads.

[0037] In the above structure, to ensure good slag blowing effect, as one specific implementation, at least two slag blowing channels 3 are provided in this embodiment of the present invention, and the slag blowing channels 3 are spaced apart circumferentially around the body 1. Depending on the actual working conditions and considering the strength requirements of the joint, 2 to 10 slag blowing channels 3 can be provided.

[0038] In the above structure, as a preferred embodiment, the slag blowing channel 3 is inclined, and the angle between the axis of the slag blowing channel 3 and the axis of the central channel 2 is 10° to 80°. The slag blowing channel 3 on the joint extends from the gas distribution section 21 toward the front end of the joint and from the central channel 2 toward the outer surface of the joint. This ensures that high-pressure gas can perform secondary slag blowing on the rock debris between the joint and the borehole wall, resulting in a better slag blowing effect.

[0039] In the above structure, as one embodiment, the aperture of the slag blowing channel 3 in this utility model embodiment is specifically 4 mm to 20 mm.

[0040] Furthermore, in this embodiment of the invention, the front end of the main body 1 is provided with a tapered external thread for connecting to the drill rod.

[0041] Furthermore, in this embodiment of the invention, the body 1 is also provided with alloy teeth, specifically on the boss at the rear end of the tapered external thread of the alloy teeth. By providing alloy teeth, external residues are prevented from wearing down the surface of the connector, thus extending the service life of the connector.

[0042] Furthermore, in order to facilitate the assembly and disassembly of the connector, as one embodiment, the main body 1 in this utility model embodiment is provided with a milled square part in the middle, wherein the outlet of the slag blowing channel 3 is provided on the milled square part.

[0043] This utility model also provides a down-the-hole impactor, including a connector and an air distribution structure. Specifically, the connector is the aforementioned connector, and the air distribution structure is used in conjunction with the connector to open and close the slag blowing channel 3. When the slag blowing channel 3 is open, the high-pressure medium in the central channel 2 can be discharged through the slag blowing channel 3. The high-pressure medium in the central channel 2 does not require work from the piston, so its pressure is high, the slag blowing force is large, the slag blowing capacity is strong, the structure is simple, and it can improve the slag discharge efficiency, increase the drilling speed, and reduce drill bit wear.

[0044] Furthermore, the gas distribution structure in this embodiment includes an outer sleeve 20, which is fitted onto the outer side of the rear end of the connector and fixedly connected to the connector (specifically, fixedly connected by threads). A gas distribution seat 30 is provided inside the outer sleeve 20, and a check valve assembly is provided on the gas distribution seat 30. The check valve assembly is used to open and close the slag blowing channel 3. The check valve assembly includes a check valve 40 and an elastic element 50. The elastic element 50 is disposed between the gas distribution seat 30 and the check valve 40. When no high-pressure medium is connected to the central channel 2, the check valve 40 closes the central channel 2 and the slag blowing channel 3 under the action of the elastic element 50. When the central channel 2 is connected to a high-pressure medium, the check valve 40 opens the slag blowing channel 3 under the action of the high-pressure medium, and the elastic element 50 undergoes elastic deformation. When the central channel 2 stops receiving high-pressure medium, the check valve 40 closes the slag blowing channel 3 under the reset force of the elastic element 50.

[0045] Furthermore, the down-the-hole hammer also includes an inner sleeve 60, a piston 70, and a drill bit 80. The inner sleeve 60 is fixedly fitted inside the outer sleeve 20, the piston 70 is movably fitted inside the inner sleeve 60, and the drill bit 80 is connected to the rear end of the outer sleeve 20. The two ends of the piston 70 form front and rear air chambers. When the central channel 2 is connected to a high-pressure medium, a pressure difference is created between the front and rear air chambers, which pushes the piston 70 to move back and forth, providing a pulse force to the drill bit 80 for drilling.

[0046] The above are merely embodiments of this utility model. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of this utility model, but these improvements all fall within the protection scope of this utility model.

Claims

1. A connector, characterized in that, include: Ontology(1); The central channel (2) is located within the main body (1); The slag blowing channel (3) has an air inlet connected to the central channel (2) and an exhaust port located on the outer surface of the body (1). The slag blowing channel (3) is configured to cooperate with the air distribution structure of the impactor so that the slag blowing channel (3) has an open state and a closed state. When the slag blowing channel (3) is in the open state, the high-pressure medium in the central channel (2) blows slag through the slag blowing channel (3).

2. The connector according to claim 1, characterized in that, The central channel (2) is provided with a gas distribution section (21), which is used in conjunction with the gas distribution structure to open and close the central channel (2) and the slag blowing channel (3). The air inlet of the slag blowing channel is located on the inner wall of the gas distribution section.

3. The connector according to claim 2, characterized in that, The air distribution section (21) is specifically a conical structure, and its inner diameter gradually increases in the direction away from the air intake end of the central channel (2).

4. The connector according to claim 2, characterized in that, Also includes: The plug (4) is detachably connected to the body (1) and is used to cooperate with the exhaust port of the slag blowing channel (3) to block the slag blowing channel (3).

5. The connector according to claim 4, characterized in that, The inner wall of the exhaust port of the slag blowing channel (3) is provided with an internal thread, and the outer surface of the plug (4) is provided with an external thread. The plug (4) and the slag blowing channel (3) are connected by threads.

6. The connector according to any one of claims 1 to 5, characterized in that, At least two slag blowing channels (3) are provided, and the slag blowing channels (3) are arranged circumferentially around the body (1).

7. The connector according to any one of claims 1 to 5, characterized in that, The slag blowing channel (3) is inclined, and the angle between the axis of the slag blowing channel (3) and the axis of the central channel (2) is 10° to 80°.

8. The connector according to any one of claims 1 to 5, characterized in that, The diameter of the slag blowing channel (3) is 4 mm to 20 mm.

9. A down-the-hole impactor, characterized in that, include: The connector according to any one of claims 1 to 8; The gas distribution structure works in conjunction with the slag blowing channel so that the slag blowing channel can be in an open or closed state. When the slag blowing channel is in the open state, the high-pressure medium in the central channel blows slag through the slag blowing channel.

10. The down-the-hole impactor according to claim 9, characterized in that, The gas distribution structure includes: An outer sleeve fitted onto the outer side of the rear end of the connector and fixedly connected to the connector; A gas distribution seat fixedly installed inside the outer sleeve; A check valve assembly installed on the gas distribution seat for opening and closing the slag blowing channel.

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