An impactor and a down-the-hole drill

Abstract

The present application discloses an impactor and a down-the-hole drill, comprising: an outer sleeve, the rear end of the outer sleeve is connected to a joint, and the front end of the outer sleeve is connected to a drill bit through a chuck sleeve; a gas distribution rod fixedly arranged inside the outer sleeve and communicated with the high-pressure air passage of the joint; a piston slidably sleeved outside the gas distribution rod, an inner sleeve is sleeved outside the piston, a first air chamber is formed among the joint, the piston, the inner sleeve and the gas distribution rod, and a second air chamber is formed among the drill bit, the piston, the outer sleeve and the gas distribution rod; an exhaust passage arranged on the joint, and the piston moves along the axial direction of the gas distribution rod so that the exhaust passage is alternately communicated with the first air chamber and the second air chamber. The impactor and the down-the-hole drill provided by the present application, compared with the prior art, can prevent residue blockage, have a good slag discharge effect, and a higher drilling efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of impactor design and manufacturing, and more specifically, to an impactor and a down-the-hole drill. Background Art

[0002] Down-the-hole drills are widely used in ore mining, engineering construction and other fields. They have a rotary drive mechanism and an impact mechanism, and use an impactor and drill bit that dive into the bottom of the hole to impact and crush the predetermined stratum, forming a predetermined hole.

[0003] Generally speaking, the working device of a down-the-hole drill rig mainly consists of a drill rig, a power head, a drill pipe, a hammer, and a drill bit. The upper end of the drill pipe is connected to the power head, and the lower end is connected to the hammer. The drill bit is mounted on the lower end of the hammer. The power head is mounted on the drill rig and is used to drive the drill pipe to rotate, which in turn drives the drill bit. The piston in the hammer can reciprocate in the direction of the drill pipe, applying a predetermined impact force to the drill bit, causing the drill bit to generate a downward impact force, forcing the drill bit to advance. Current hammers are generally pneumatic hammers. An air pump on the ground supplies high-pressure gas to the hammer through the drill pipe, which drives the hammer.

[0004] The positive circulation impactor in the prior art basically adopts the method of slag discharge on both sides. After the high-pressure gas enters the outer sleeve to realize the reciprocating impact of the piston, it enters the slag blowing channel in the drill bit, and blows the broken rock out from both sides of the impactor to discharge the slag. When the residue is blown to the connection between the impactor and the drill rod, insufficient power is likely to occur, and the residue is easily accumulated on the drill rod and the impactor, affecting the slag discharge effect. In severe cases, it may even affect the drilling efficiency.

[0005] Therefore, there is an urgent need for an impactor and a down-the-hole drill that can prevent residue blockage, have a good slag removal effect, and have higher drilling efficiency. Summary of the Invention

[0006] In order to solve the above technical problems, the present application provides an impactor and a down-the-hole drill, which can prevent residue blockage, have good slag removal effect, and higher drilling efficiency.

[0007] The technical solutions provided in this application are as follows:

[0008] An impactor, comprising:

[0009] An outer sleeve, the rear end of which is connected to the joint, and the front end of which is connected to the drill bit via a clamping sleeve;

[0010] a gas distribution rod fixedly disposed in the outer sleeve and connected to the high-pressure air passage of the joint;

[0011] A piston slidably sleeved on the outside of a valve rod, an inner sleeve is sleeved on the outside of the piston, a first air chamber is formed among the joint, the piston, the inner sleeve and the valve rod, and a second air chamber is formed among the drill bit, the piston, the outer sleeve and the valve rod;

[0012] An exhaust passage arranged on the joint, the piston moves along the axial direction of the valve rod so that the exhaust passage is alternately communicated with the first air chamber and the second air chamber.

[0013] Preferably, an air flow gap is arranged between the inner wall of the outer sleeve and the outer wall of the inner sleeve, and the air flow gap is communicated with the exhaust passage;

[0014] The inner sleeve is axially provided with a first air hole and a second air hole communicated with the air flow gap, the first air chamber can be communicated with the air flow gap through the first air hole, and the second air chamber can be communicated with the air flow gap through the second air hole.

[0015] Preferably, the air outlet of the exhaust passage is arranged on the rear end face of the joint.

[0016] Preferably, it further includes:

[0017] A valve plate movably sleeved on the outside of the joint for opening and closing the exhaust passage;

[0018] A joint cover sleeved on the outside of the joint, an air chamber is arranged in the joint cover, and the valve plate is arranged in the air chamber;

[0019] An exhaust port communicated with the air chamber and used for exhausting is further arranged on the joint cover.

[0020] Preferably, it further includes:

[0021] A first seal arranged between the joint cover and the joint and between the joint and the inner wall of the outer sleeve.

[0022] Preferably, a central air passage communicated with the high-pressure air passage is arranged in the valve rod, and a third air hole and a fourth air hole communicated with the central air passage are arranged at intervals along the axial direction of the valve rod;

[0023] A first air passage and a second air passage are arranged on the piston, the air outlet of the first air passage is communicated with the first air chamber, the air outlet of the second air passage is communicated with the second air chamber, and there is a pressure difference between the first air chamber and the second air chamber, which pushes the piston to reciprocate along the axial direction of the valve rod so that the central air passage is alternately communicated with the first air chamber and the second air chamber.

[0024] Preferably, it further includes:

[0025] A second seal member disposed between the outer wall of the valve rod and the inner wall of the central air passage.

[0026] Preferably, the first air passage and the second air passage are inclined.

[0027] Preferably, the drill bit is specifically a down-the-hole drill bit or a roller bit.

[0028] A down-the-hole drill rig, comprising:

[0029] A power head;

[0030] A drill pipe connected to the output end of the power head;

[0031] An impactor as described in any one of the above at one end of the drill pipe away from the power head.

[0032] For the impactor provided by the present invention, firstly, since there are an outer sleeve, a valve rod, a piston, and an inner sleeve. Among them, the rear end of the outer sleeve is connected to a joint, and a high-pressure air passage for air intake is provided in the joint. The front end of the outer sleeve is connected to a drill bit through a chuck sleeve. The valve rod is fixedly arranged in the outer sleeve and is communicated with the high-pressure air passage in the joint. The valve rod is used for air distribution. The piston is slidably sleeved outside the valve rod, and the piston can move along the axial direction of the valve rod. An inner sleeve is arranged in the outer sleeve, and the inner sleeve is sleeved outside the piston, and the piston can move between the valve rod and the inner sleeve. A first air chamber is formed among the joint, the piston, the inner sleeve, and the valve rod. A second air chamber is formed among the drill bit, the piston, the outer sleeve, and the valve rod. Secondly, an exhaust passage is also provided. The exhaust passage is arranged on the joint. The piston moves along the axial direction of the valve rod so that the exhaust passage is alternately communicated with the first air chamber and the second air chamber. When the exhaust passage is communicated with the first air chamber, the waste gas in the first air chamber can be discharged through the exhaust passage to assist in slag blowing. When the exhaust passage is communicated with the second air chamber, the waste gas in the second air chamber can be discharged through the exhaust passage. Since the exhaust passage is arranged on the joint, and one end of the joint away from the drill bit is connected to the drill pipe, it can provide subsequent power for the blowing out of the residue, avoiding the accumulation of the residue at the connection between the joint and the drill pipe and causing blockage of the residue. It can be seen that, compared with the prior art, the impactor in the embodiment of the present invention can prevent residue blockage, has a good slag discharge effect, and has a higher drilling efficiency.

[0033] The present invention also provides a down-the-hole drill rig, comprising a power head, a drill pipe, and an impactor. Among them, the drill pipe is connected to the output end of the power head, and one end of the drill pipe away from the power head is connected to the impactor. Since the down-the-hole drill rig provided by the present invention includes the above-mentioned impactor, therefore, the down-the-hole drill rig in the embodiment of the present invention can also prevent residue blockage, has a good slag discharge effect, and has a higher drilling efficiency. Description of the Drawings

[0034] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0035] Figure 1 A schematic structural diagram of an impactor provided by an embodiment of the present invention;

[0036] Figure 2 For Figure 1 A partial enlarged view of the piston position;

[0037] Figure 3 A schematic structural diagram of a piston provided by an embodiment of the present invention;

[0038] Figure 4 A schematic structural diagram of a gas distribution rod provided by an embodiment of the present invention;

[0039] Figure 5 A schematic structural diagram of an outer sleeve provided by an embodiment of the present invention;

[0040] Figure 6 For Figure 1 A partial enlarged view of the joint end;

[0041] Figure 7 An exploded view of a joint section provided by an embodiment of the present invention;

[0042] Figure 8 A schematic structural diagram of the initial working state of an impactor provided by an embodiment of the present invention;

[0043] Figure 9 A schematic structural diagram of an impactor provided by an embodiment of the present invention when the piston moves upward;

[0044] Figure 10 A schematic structural diagram of an impactor provided by an embodiment of the present invention when the piston moves to the uppermost end;

[0045] Figure 11 A schematic structural diagram of an impactor provided by an embodiment of the present invention when the piston moves downward;

[0046] Figure 12 A schematic structural diagram of an impactor provided by an embodiment of the present invention when the piston moves to the lowermost end.

[0047] Reference numerals: 1. outer sleeve; 2. joint; 3. drill bit; 4. drill rod sleeve; 5. air distribution rod; 6. piston; 7. inner sleeve; 8. first air chamber; 9. second air chamber; 10. bushing; 11. snap ring; 21. exhaust passage; 22. air flow gap; 23. first air hole; 24. second air hole; 25. valve plate; 26. joint cover; 27. exhaust port; 28. first seal; 29. high-pressure air passage; 31. slag blowing air passage; 51. central air passage; 52. third air hole; 53. fourth air hole; 54. second seal; 61. first air passage; 62. second air passage. Detailed implementation manners

[0048] 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 a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0049] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly disposed 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.

[0050] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying 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 to this application.

[0051] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, the meaning of "a plurality of" and "several" is two or more, unless otherwise specifically defined.

[0052] It should be noted that the structures, proportions, sizes, etc. shown in the attached drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the implementation conditions of this application. Therefore, they do not have substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects that this application can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in this application.

[0053] The embodiments of the present invention are written in a progressive manner.

[0054] As Figures 1 to 12 shown, an impactor provided by an embodiment of the present invention includes: an outer sleeve 1, the rear end of the outer sleeve 1 is connected to a joint 2, and the front end of the outer sleeve 1 is connected to a drill bit 3 through a chuck sleeve 4; a gas distribution rod 5 fixedly arranged inside the outer sleeve 1 and communicating with a high-pressure air passage 29 of the joint 2; a piston 6 slidably sleeved outside the gas distribution rod 5, an inner sleeve 7 is arranged outside the piston 6, a first air chamber 8 is formed among the joint 2, the piston 6, the inner sleeve 7 and the gas distribution rod 5, and a second air chamber 9 is formed among the drill bit 3, the piston 6, the outer sleeve 1 and the gas distribution rod 5; an exhaust passage 21 arranged on the joint 2, and the piston 6 moves along the axis direction of the gas distribution rod 5 so that the exhaust passage 21 is alternately communicated with the first air chamber 8 and the second air chamber 9.

[0055] It should be noted that in the embodiments of the present invention, the "front end" refers to the end of the outer sleeve 1 close to the drill bit 3, and the "rear end" in the embodiments of the present invention refers to the end of the outer sleeve 1 close to the joint 2.

[0056] In the impactors in the prior art, the exhaust of the waste gas in the first air chamber and the second air chamber often passes through the slag discharge passage on the drill bit, and the waste gas in the slag discharge passage blows out from both sides of the impactor to blow out the residue. However, since the aperture of the drill pipe is often smaller than the aperture of the joint of the impactor, and the gap between the drill pipe and the inner wall of the hole is often larger than the gap between the impactor and the inner wall of the hole, when the slag discharge waste gas blows the residue to the drill pipe and the joint, it may cause the situation of insufficient slag blowing power, resulting in the residue accumulating in the hole, affecting the slag discharge effect, and even seriously affecting the drilling efficiency in severe cases.

[0057] The impactor provided by the present invention, firstly, is provided with an outer sleeve 1, a gas distribution rod 5, a piston 6, and an inner sleeve 7. Among them, the rear end of the outer sleeve 1 is connected to a joint 2, and a high-pressure air passage 29 for air intake is arranged in the joint 2. The front end of the outer sleeve 1 is connected to a drill bit 3 through a chuck sleeve 4. The gas distribution rod 5 is fixedly arranged in the outer sleeve 1 and is communicated with the high-pressure air passage 29 in the joint 2. The gas distribution rod 5 is used for gas distribution. The piston 6 is slidably sleeved outside the gas distribution rod 5, and the piston 6 can move along the axial direction of the gas distribution rod 5. An inner sleeve 7 is arranged in the outer sleeve 1, the inner sleeve 7 is sleeved outside the piston 6, and the piston 6 can move between the gas distribution rod 5 and the inner sleeve 7. A first air chamber 8 is formed among the joint 2, the piston 6, the inner sleeve 7, and the gas distribution rod 5. A second air chamber 9 is formed among the drill bit 3, the piston 6, the outer sleeve 1, and the gas distribution rod 5. Secondly, an exhaust passage 21 is also provided. The exhaust passage 21 is arranged on the joint 2. The piston 6 moves along the axial direction of the gas distribution rod 5 so that the exhaust passage 21 is alternately communicated with the first air chamber 8 and the second air chamber 9. When the exhaust passage 21 is communicated with the first air chamber 8, the waste gas in the first air chamber 8 can be discharged through the exhaust passage 21 to assist in slag blowing. When the exhaust passage 21 is communicated with the second air chamber 9, the waste gas in the second air chamber 9 can be discharged through the exhaust passage 21. Since the exhaust passage 21 is arranged on the joint 2, and one end of the joint 2 away from the drill bit 3 is connected to a drill pipe, it can provide subsequent power for the blowing out of the residue, and avoid the residue from accumulating at the connection between the joint 2 and the drill pipe, causing blockage of the residue. It can be seen that, compared with the prior art, the impactor in the embodiment of the present invention can prevent residue blockage, has a good slag discharge effect, and has a higher drilling efficiency.

[0058] In the above structure, as one of the implementation manners, the inner sleeve 7 in the embodiment of the present invention is arranged in the outer sleeve 1, and an axial positioning component is arranged between the outer sleeve 1 and the inner sleeve 7 to prevent the inner sleeve 7 from moving axially in the outer sleeve 1.

[0059] As one of the implementation manners, the inner sleeve 7 and the joint 2 in the embodiment of the present invention are of an integrally formed structure. The axial positioning component includes an external thread line arranged on the joint 2 and an internal thread line arranged on the outer sleeve 1. The joint 2 and the outer sleeve 1 are connected by threads.

[0060] As another implementation manner, the inner sleeve 7 and the joint 2 are detachably connected, and the joint 2 and the outer sleeve 1 are connected by threads. Among them, the axial positioning component includes a hanging platform arranged on the outer wall of the inner sleeve 7 and a convex platform arranged on the inner wall of the outer sleeve 1 and cooperating with the hanging platform. The hanging platform and the convex platform cooperate to limit and restrain the axial displacement of the inner sleeve 7 in the outer sleeve 1.

[0061] In the above structure, as one of the embodiments, an air flow gap 22 is provided between the inner wall of the outer sleeve 1 and the outer wall of the inner sleeve 7 in the embodiment of the present invention. The air flow gap 22 communicates with the exhaust passage 21. A first air hole 23 and a second air hole 24 are arranged at intervals along the axial direction of the inner sleeve 7. The first air hole 23 is arranged at one end of the inner sleeve 7 close to the joint 2, and the second air hole 24 is arranged at one end of the inner sleeve 7 close to the drill bit 3. The first air chamber 8 can communicate with the air flow gap 22 through the first air hole 23, and the second air chamber 9 can communicate with the air flow gap 22 through the second air hole 24. There is a pressure difference between the first air chamber 8 and the second air chamber 9. Under the action of the pressure difference, the piston 6 can be pushed to move along the axis direction of the air distribution rod 5. Since the first air hole 23 and the second air hole 24 are provided on the inner sleeve 7, when the piston 6 moves to the position where the first air hole 23 on the inner sleeve 7 communicates with the first air chamber 8, the waste gas in the first air chamber 8 can be discharged from the exhaust passage 21 through the first air hole 23 and the air flow gap 22, and the waste gas in the first air chamber 8 is used for slag blowing; when the piston 6 moves to the position where the second air hole 24 on the inner sleeve 7 communicates with the second air chamber 9, the waste gas in the second air chamber 9 can be discharged from the exhaust passage 21 through the second air hole 24 and the air flow gap 22. At this time, the waste gas discharged from the second air chamber 9 is used for slag blowing. Further, in the embodiment of the present invention, the gas for auxiliary slag blowing in the exhaust passage 21 is specifically the waste gas generated during the movement of the piston 6, without the need to provide an additional air source, and its structure is simpler and more energy-saving.

[0062] In the above structure, the air outlet of the exhaust passage 21 can be arranged on the rear end face of the joint 2, or the air outlet of the exhaust passage 21 can also be arranged on the side of the joint 2. As one of the preferred embodiments, the air outlet of the exhaust passage 21 in the embodiment of the present invention is arranged on the rear end face of the joint 2, and the waste gas discharged from the exhaust passage 21 is discharged along the length direction of the drill pipe, maximizing the power of waste gas slag blowing and making the most of the energy of the waste gas.

[0063] In the above structure, in order to prevent impurities outside the impactor from entering the impactor through the exhaust passage 21, as one of the embodiments, the impactor in the embodiment of the present invention further includes a valve plate 25. The valve plate 25 is movably sleeved outside the joint 2, and the valve plate 25 can completely cover the air outlet of the exhaust passage 21. The valve plate 25 is used to open and close the exhaust passage 21. When the impactor is in use, under the action of gravity, the valve plate 25 abuts against the air outlet of the exhaust passage 21 to close the exhaust passage 21. When the air pressure in the exhaust passage 21 is greater than the sum of the external air pressure and the gravity of the valve plate 25, the valve plate is caused to move along the axis direction of the joint 2, so that the high-pressure gas is discharged from the gap between the valve plate 25 and the exhaust passage. Further, the end of the joint 2 far from the outer sleeve 1 is connected to the drill pipe, and the axial displacement of the valve plate 25 is limited and constrained by the end face of the drill pipe.

[0064] Furthermore, as a more preferred embodiment, in order to prevent residues from accumulating between the valve plate 25 and the drill pipe during the discharge process and affecting the exhaust effect of the exhaust passage, as a more preferred embodiment, the impactor in the embodiment of the present invention further includes a joint cover 26. Specifically, it is arranged at the rear end of the valve plate 25, and the joint cover 26 is sleeved outside the joint 2. Under the action of the drill pipe, the front end face of the joint cover 26 abuts against the joint 2. An air chamber is arranged inside the joint cover 26, and the valve plate 25 is arranged in the air chamber. The axial displacement of the valve plate 25 is limited and constrained by the joint cover 26. An exhaust port 27 is arranged on the joint cover 26, and the exhaust port 27 is used to communicate the air chamber with the outside of the impactor. The valve plate 25 is arranged in the air chamber of the joint cover 26 to restrict the displacement of the valve plate 25. The joint cover 26 is arranged between the drill pipe and the valve plate 25 to prevent residues from affecting the opening and closing of the valve plate 25. When the air pressure in the exhaust passage 21 is greater than the external air pressure, the exhaust passage 21 flushes open the valve plate 25 and discharges it through the exhaust port 27. When the air pressure in the exhaust passage 21 is less than the external air pressure, the valve plate 25 closes.

[0065] In the above structure, as one of the embodiments, the exhaust port 27 in the embodiment of the present invention is inclined to prevent residues outside the joint cover 26 from entering the air chamber through the exhaust port 27.

[0066] In the above structure, in order to prevent the high-pressure gas in the impactor from leaking and affecting the slag discharge effect, as one of the embodiments, a first seal 28 is arranged between the joint cover 26 and the joint 2, and between the joint 2 and the inner wall of the outer sleeve 1.

[0067] In the above structure, as one of the embodiments, a central airway 51 communicating with a high-pressure airway 29 is arranged inside the air distribution rod 5 of the impactor in the embodiment of the present invention. A third air hole 52 and a fourth air hole 53 are arranged at intervals along the axial direction of the central airway 51. Specifically, the third air hole 52 is arranged at one end of the air distribution rod 5 close to the joint 2, and the intake port of the third air hole 52 communicates with the central airway 51. The fourth air hole 53 is arranged at one end of the air distribution rod 5 close to the drill bit 3, and the intake hole of the fourth air hole 53 communicates with the central airway 51. A first airway 61 communicating with the first air chamber 8 and a second airway 62 communicating with the second air chamber 9 are arranged on the piston 6. There is a pressure difference between the first air chamber 8 and the second air chamber 9, which can push the piston 6 to move along the axial direction of the air distribution rod 5 to switch the connection between the central airway 51 and the first air chamber 8 or the second air chamber 9, so that the piston 6 can reciprocate and act on the drill bit 3 to apply a predetermined impact force to the drill bit 3, causing the drill bit 3 to generate a downward impact force.

[0068] In the above structure, a slag blowing air passage 31 is provided inside the drill bit 3 in the embodiment of the present invention. The shank of the drill bit 3 is connected to the chuck sleeve 4 through a spline. A bushing 10 is provided on the outer side of the shank of the drill bit 3. The bushing 10 is hermetically connected to the outer sleeve 1 through a seal. A snap ring 11 is also provided on the outer side of the shank of the drill bit 3. The snap ring 11 is provided between the bushing 10 and the chuck sleeve 4. The drill bit 3 is installed at the front end of the outer sleeve 1 through the snap ring 11 and the chuck sleeve 4.

[0069] In the above structure, the front end of the air distribution rod 5 in the embodiment of the present invention is inserted into the slag blowing channel of the drill bit 3. The front end of the drill bit 3 is provided with a slag blowing port communicating with the slag blowing channel. The exhaust process of the impactor provided in the embodiment of the present invention is specifically as follows: During the use of the impactor in the embodiment of the present invention, it is vertically arranged in the vertical direction. Please refer to Figures 8 to 12 as shown, where the thin arrow indicates the flow direction of the high-pressure gas, and the thick arrow indicates the moving direction of the piston 6.

[0070] In the initial state, please refer to Figure 8 as shown. Under the action of gravity, the piston 6 is located at the lowest end of the stroke. The front end face of the piston 6 abuts against the rear end face of the shank of the drill bit 3. The central air passage 51 of the air distribution rod 5 communicates with the second air chamber 9 through the fourth air hole 53. The third air hole 52 is isolated from the first air chamber 8. The first air chamber 8 communicates with the exhaust passage through the first air hole 23. The high-pressure gas enters the central air passage 51 of the air distribution rod 5 from the high-pressure air passage 29 inside the joint 2. Part of the gas enters the slag blowing channel of the drill bit 3 and is discharged, and part of the gas enters the second air chamber 9 from the fourth air hole 53 and the second air passage 62. As the gas pressure in the second air chamber 9 increases, the piston 6 is pushed to move in the direction of the joint 2. The gas in the first air chamber 8 is discharged from the exhaust passage through the first air hole 23 and the air flow gap. Part of the high-pressure gas in the slag blowing channel blows the broken rock out from both sides of the impactor for slag discharge, and the other part of the high-pressure gas in the exhaust passage assists in slag blowing.

[0071] Please refer to Figure 9 as shown. As the piston 6 moves in the direction of the joint 2, the central air passage 51 of the air distribution rod 5 is isolated from the fourth air hole 53 and at the same time the central air passage 51 is isolated from the third air hole 52. At this time, all of the high-pressure air passage 29 of the central air passage 51 of the air distribution rod 5 is discharged from the slag blowing air passage 31 of the drill bit 3, and the broken rock is blown out from both sides of the impactor for slag discharge.

[0072] Please refer to Figure 10As shown in the figure, under the action of inertia, the piston 6 continues to move towards the joint 2 to the highest point. At this time, the central airway 51 of the valve rod 5 communicates with the third air hole 52, and the central airway 51 of the valve rod 5 is isolated from the fourth air hole 53. The second air chamber 9 communicates with the air flow gap through the second air hole 24. A part of the high-pressure gas in the central airway 51 of the valve rod 5 is exhausted from the slag blowing airway 31 of the drill bit 3 to blow slag, and another part of the high-pressure gas enters the first air chamber 8 through the third air hole 52 and the first airway 61. The first air chamber 8 is isolated from the first air hole 23.

[0073] Please as Figure 11 As shown in the figure, as the air pressure in the first air chamber 8 increases, it pushes the piston 6 to move towards the drill bit 3, so that the high-pressure gas in the second air chamber 9 is exhausted from the exhaust passage through the second air hole 24 and the air flow gap to assist in slag blowing.

[0074] Please as Figure 12 As shown in the figure, as the piston 6 moves towards the drill bit 3 until the piston 6 moves to the lowest point, the central airway 51 of the air rod communicates with the second air chamber 9 through the fourth air hole 53. The third air hole 52 is isolated from the first air chamber 8. The first air chamber 8 communicates with the exhaust passage through the first air hole 23. A part of the high-pressure gas in the central airway 51 is exhausted from the slag blowing airway 31 of the drill bit 3 to blow slag, and another part of the high-pressure gas enters the second air chamber 9 through the fourth air hole 53 and the second airway 62, increasing the air pressure in the second air chamber 9 and pushing the piston 6 to move towards the joint 2.

[0075] In the above structure, as one of the implementation manners, the first airway 61 and the second airway 62 in the embodiment of the present invention are inclined, and the exhaust is smoother.

[0076] Furthermore, as one of the implementation manners, the drill bit 3 in the embodiment of the present invention is specifically a down-the-hole drill bit 3 or a roller cone drill bit 3.

[0077] The present invention also provides a down-the-hole drill, including a power head, a drill pipe and an impactor. Among them, the impactor is arranged at one end of the drill pipe away from the power head. The impactor is the impactor of any one of the above. Since an exhaust passage 21 is arranged on the joint 2 of the impactor, through the exhaust passage, subsequent power can be provided for the blowing out of the residue, avoiding the residue from accumulating at the connection between the joint 2 and the drill pipe and causing blockage of the residue. It can be seen that compared with the prior art, the down-the-hole drill in the embodiment of the present invention can prevent residue blockage, has a good slag discharging effect and a higher drilling efficiency.

[0078] The foregoing 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 readily 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. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An impactor, characterized in that, Comprising: An outer sleeve (1), the rear end of the outer sleeve (1) is connected to a joint (2), and the front end of the outer sleeve (1) is connected to a drill bit (3) through a chuck sleeve (4); A gas distribution rod (5) fixedly arranged inside the outer sleeve (1) and communicating with the high-pressure air passage (29) of the joint (2); A piston (6) slidably sleeved outside the gas distribution rod (5), an inner sleeve (7) is sleeved outside the piston (6), a first air chamber (8) is formed between the joint (2), the piston (6), the inner sleeve (7) and the gas distribution rod (5), and a second air chamber (9) is formed between the drill bit (3), the piston (6), the outer sleeve (1) and the gas distribution rod (5); An exhaust passage (21) arranged on the joint (2), and the piston (6) moves along the axial direction of the gas distribution rod (5) so that the exhaust passage (21) communicates with the first air chamber (8) and the second air chamber (9) alternately; A central air passage (51) communicating with the high-pressure air passage (29) is arranged inside the gas distribution rod (5), and a third air hole (52) and a fourth air hole (53) communicating with the central air passage (51) are arranged at intervals along the axial direction of the gas distribution rod (5); A first air passage (61) and a second air passage (62) are arranged on the piston (6), the air outlet of the first air passage (61) communicates with the first air chamber (8), the air outlet of the second air passage (62) communicates with the second air chamber (9), and there is a pressure difference between the first air chamber (8) and the second air chamber (9), which pushes the piston (6) to reciprocate along the axial direction of the gas distribution rod (5) so that the central air passage (51) communicates with the first air chamber (8) and the second air chamber (9) alternately.

2. The impactor according to claim 1, wherein An air flow gap (22) is provided between the inner wall of the outer sleeve (1) and the outer wall of the inner sleeve (7), and the air flow gap (22) communicates with the exhaust passage (21); A first air hole (23) and a second air hole (24) communicating with the air flow gap (22) are arranged at axial intervals of the inner sleeve (7), the first air chamber (8) can communicate with the air flow gap (22) through the first air hole (23), and the second air chamber (9) can communicate with the air flow gap (22) through the second air hole (24).

3. The impactor according to claim 2, wherein The air outlet of the exhaust passage (21) is arranged on the rear end face of the joint (2).

4. The impactor according to claim 3, wherein Further comprising: A valve plate (25) movably sleeved outside the joint (2) for opening and closing the exhaust passage (21); A joint cover (26) sleeved outside the joint (2), an air chamber is arranged inside the joint cover (26), and the valve plate (25) is arranged in the air chamber; An exhaust port (27) communicating with the air chamber and used for exhausting is further arranged on the joint cover (26).

5. The impactor according to claim 4, wherein: It further comprises: A first seal (28) disposed between the joint cover (26) and the joint (2) and between the joint (2) and the inner wall of the outer sleeve (1).

6. The impactor according to claim 5, wherein: It further comprises: A second seal (54) disposed between the outer wall of the air distribution rod (5) and the inner wall of the central air passage (51).

7. The impactor according to claim 5, wherein: The first air passage (61) and the second air passage (62) are inclined.

8. The impactor according to any one of claims 1-7, wherein: The drill bit (3) is specifically a down-the-hole drill bit or a roller cone drill bit.

9. A down-the-hole drill, characterized in that, It comprises: A power head; A drill pipe connected to the output end of the power head; An impactor as described in any one of claims 1 to 8 at one end of the drill pipe away from the power head.

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