Long spiral drilling tool

Abstract

The utility model discloses a long spiral drilling tool which comprises an inner casing pipe, an outer casing pipe, an outer casing pipe and an inner casing pipe, the front end of the inner sleeve is movably sleeved with the rotary excavating drill bit, cutting teeth are arranged in the circumferential direction of the front end of the rotary excavating drill bit, and a guniting assembly is arranged at the front end of the rotary excavating drill bit; the outer side of the inner sleeve is sleeved with the outer sleeve, the outer sleeve is in transmission connection with the rotary digging drill bit, and spiral blades used for deslagging are arranged on the outer circumferential surfaces of the outer sleeve and the rotary digging drill bit; the piston is movably arranged between the inner sleeve and the outer sleeve, a first air chamber is formed among the outer sleeve, the piston and the inner sleeve, a second air chamber is formed among the piston, the rotary excavating drill bit, the outer sleeve and the inner sleeve, the air distribution channel is arranged in the outer sleeve, and the air distribution channel is alternately communicated with the first air chamber and the second air chamber. And the piston is driven to reciprocate in the axial direction of the inner sleeve so as to provide pulse acting force for the rotary excavating drill bit. Compared with the prior art, the long spiral drilling tool has the advantages that the drilling speed can be increased, and the construction efficiency can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of drilling equipment, and more specifically, to a long spiral drilling tool. Background Art

[0002] Long spiral drilling is widely used in the construction of pile foundation holes for buildings and bridges. In order to ensure the quality of pile foundations, the national construction standards have strict requirements on the depth of pile foundation holes. The hole depth must be 1.5 to 2 times the hole diameter into the rock. The difficulty encountered during construction is that when the construction geological conditions include mixed rock layers or the hardness of the rock entering the rock is relatively high, the long spiral rotary drilling method is used to open the hole, and its drilling speed is very slow, which seriously affects the construction progress.

[0003] Therefore, there is an urgent need for a long spiral drilling tool that can increase the drilling speed and improve construction efficiency. Utility Model Content

[0004] In order to solve the above technical problems, the present application provides a long spiral drilling tool that can increase the drilling speed and improve construction efficiency.

[0005] The technical solutions provided in this application are as follows:

[0006] A long spiral drilling tool, comprising:

[0007] An inner casing, wherein a grouting channel and a high-pressure air channel are provided in the inner casing, and the high-pressure air channel is provided outside the grouting channel;

[0008] A rotary drilling bit movably sleeved on the front end of the inner casing, wherein the front end of the rotary drilling bit is provided with picks in the circumferential direction, and the front end of the rotary drilling bit is provided with a spraying assembly;

[0009] An outer sleeve is sleeved on the outside of the inner sleeve and is transmission-connected to the rotary drill bit, wherein the outer sleeve and the outer circumferential surface of the rotary drill bit are provided with spiral blades for slag removal;

[0010] a piston movably disposed between the inner sleeve and the outer sleeve, wherein a first air chamber is formed between the outer sleeve, the piston, and the inner sleeve, and a second air chamber is formed between the piston, the rotary drill bit, the outer sleeve, and the inner sleeve;

[0011] An air distribution channel is connected to the high-pressure air channel, and the air distribution channel is alternately connected to the first air chamber and the second air chamber, driving the piston to reciprocate along the axial direction of the inner sleeve to provide a pulse force for the rotary drilling bit.

[0012] Preferably, it also includes:

[0013] An exhaust port provided on the rotary drilling drill bit;

[0014] an exhaust pipe disposed in the rotary drill bit, the exhaust pipe being alternately connected to the second air chamber and the first air chamber;

[0015] A one-way air valve is provided at the end of the exhaust pipe, and the one-way air valve is used in conjunction with the exhaust port to allow gas to be discharged from the exhaust port from the exhaust pipe in one direction.

[0016] Preferably, the inner sleeve comprises:

[0017] grouting pipe;

[0018] A joint is sleeved on the outside of the rear end of the grouting pipe and is sealed with the grouting pipe, the grouting channel is arranged in the axial direction of the joint and the grouting pipe, and the high-pressure air channel is arranged at the front end of the joint;

[0019] A check valve assembly is provided in the joint and is used to open and close the high-pressure air passage.

[0020] Preferably, the high-pressure airway comprises:

[0021] a first air channel disposed at the rear end of the connector;

[0022] a second air channel provided at the front end of the connector, wherein an outlet of the second air channel is in communication with the air distribution channel;

[0023] a third air channel for connecting the first air channel and the second air channel, wherein the outlet of the third air channel extends to the outer surface of the connector, and a plug is provided at the outlet of the third air channel;

[0024] The check valve assembly is arranged at the connection between the first air channel and the third air channel, and is used to open and close the first air channel.

[0025] Preferably, the check valve assembly comprises:

[0026] a valve stem, wherein a rear end of the valve stem is provided with a tapered molding surface for opening and closing the first air passage;

[0027] An elastic member connected to the valve stem has a compressed state and a reset state. When the elastic member is in the compressed state, the first air channel is connected to the third air channel. When the elastic member is in the reset state, the first air channel is isolated from the third air channel.

[0028] Preferably, the outer sleeve comprises:

[0029] a first outer tube, the front end of which is drivingly connected to the rotary drill bit;

[0030] A positioning member fixedly disposed in the first outer tube and used to limit and constrain the axial displacement of the rotary drilling bit;

[0031] a second outer tube sleeved inside the first outer tube, wherein two ends of the second outer tube respectively abut against the joint and the positioning member;

[0032] An air distribution component is fixedly sleeved between the second outer tube and the inner sleeve, and the air distribution component and the inner sleeve are sealed.

[0033] Preferably, the gas distribution assembly comprises:

[0034] A gas distribution seat is fixedly sleeved on the outer side of the inner sleeve, and a first chamber is formed between the gas distribution seat and the joint, and the first chamber is used to communicate with the high-pressure air channel;

[0035] An inner cylinder is sleeved on the outer side of the front end of the valve seat and fixedly connected to the second outer tube, the piston is slidably disposed in the inner cylinder, and a second chamber is formed between the inner cylinder and the second outer tube;

[0036] A gas passage is provided in the gas distribution seat and is used to connect the first chamber and the second chamber.

[0037] Preferably, the gas distribution channel includes:

[0038] an air hole provided on the inner cylinder and communicating with the second chamber;

[0039] a first annular groove provided on the piston, wherein the first annular groove is recessed from the outer circumferential surface of the piston toward the axial direction of the piston;

[0040] a second annular groove provided on the second outer tube and communicating with the second air chamber, wherein the second annular groove is recessed from the inner wall of the second outer tube in a direction away from the axis;

[0041] a third annular groove provided on the inner cylinder and used for connecting the second annular groove and the first air chamber, wherein the third annular groove is recessed from the inner wall of the inner cylinder in a direction away from the axis;

[0042] An exhaust channel is formed between the inner wall of the piston and the inner sleeve, and an outlet of the exhaust channel is communicated with the exhaust pipe.

[0043] Preferably, when the gas distribution channel is in communication with the second air chamber, the second chamber is in communication with the second air chamber through the first annular groove and the second annular groove, and the first air chamber is in communication with the exhaust pipe through the exhaust channel;

[0044] When the air distribution channel is connected to the first air chamber, the second chamber is connected to the first air chamber through the first annular groove, the second annular groove and the third annular groove, and the second air chamber is connected to the exhaust pipe through the exhaust channel.

[0045] Preferably, the rotary drilling bit comprises:

[0046] A drill shank is provided between the outer sleeve and the inner sleeve, and the drill shank and the outer sleeve are connected via a clamping sleeve;

[0047] A seal provided between the drill shank and the outer sleeve, and between the drill shank and the inner sleeve;

[0048] The impact drill bit is arranged at the front end of the drill shank and fixedly connected to the drill shank.

[0049] The long spiral drill provided by the utility model comprises an inner casing, a rotary drill bit and an outer casing, wherein a grouting channel is provided axially of the inner casing, a high-pressure air channel is provided outside the grouting channel, the grouting channel is used to accommodate and transport concrete, and the high-pressure air channel is provided outside the grouting channel for transporting high-pressure gas. The rotary drill bit is movably mounted on the front end of the inner casing, and a cutting tooth is provided circumferentially on the front end of the rotary drill bit for assisting in drilling. The front end of the rotary drill bit is also provided with a spraying assembly, which is connected to the grouting channel and is used to transport concrete in the grouting channel into the hole. The outer casing is mounted on the outside of the inner casing and is in transmission connection with the rotary drill bit. The outer circumferential surfaces of the outer casing and the rotary drill bit are provided with spiral blades for slag removal. During the drilling process, the power head provides the outer casing and the rotary drill bit with rotational and downward driving force, and the rotary drill bit breaks rock. During the rotation of the outer casing and the rotary drill bit, rock slag is discharged by the spiral blades.

[0050] Secondly, in order to further improve the efficiency of drilling, the long spiral drill provided by the present invention also includes a piston and an air distribution channel, wherein the piston is arranged between the inner sleeve and the outer sleeve, a first air chamber is formed between the outer sleeve, the piston and the inner sleeve, a second air chamber is formed between the piston, the rotary drill bit, the outer sleeve and the inner sleeve, the air distribution channel is connected to the high-pressure air channel, and the air distribution channel is alternately connected to the first air chamber and the second air chamber, so that an air pressure difference is formed between the first air chamber and the second air chamber, pushing the piston to move back and forth along the axial direction of the inner sleeve, thereby providing a pulse force for the rotary drill bit, and the processing efficiency is higher. It can be seen that compared with the prior art, the long spiral drill in the embodiment of the present invention is also provided with a piston and an air distribution channel, which can provide a pulse force for the rotary drill bit, can increase the drilling speed, and improve the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0052] Figure 1 A schematic structural diagram of a long spiral drilling tool provided in an embodiment of the present utility model;

[0053] Figure 2 for Figure 1 A partial enlarged view of the rear end of the long spiral drilling tool is provided;

[0054] Figure 3 A schematic diagram of the structure of a long spiral drill provided by an embodiment of the utility model (the second air chamber is for air intake and the first air chamber is for exhaust);

[0055] Figure 4 for Figure 3 A partial enlarged view of point A in the middle;

[0056] Figure 5 A schematic structural diagram of a check valve assembly provided by an embodiment of the present utility model;

[0057] Figure 6 for Figure 3 A schematic diagram of the structure of the central gas distribution channel;

[0058] Figure 7 A schematic diagram of the structure of a long spiral drilling machine provided by an embodiment of the utility model (the first air chamber is for intake, and the second air chamber is for exhaust);

[0059] Figure 8 for Figure 7 A structural schematic diagram of the gas distribution channel in FIG.

[0060] Figure 9 A structural schematic diagram of a rotary drilling bit provided in an embodiment of the utility model.

[0061] Reference numerals: 11, grouting pipe; 111, grouting channel; 12, joint; 121, high-pressure air channel; 1211, first air channel; 1212, second air channel; 1213, third air channel; 1214, plug; 13, check valve assembly; 131, valve stem; 132, tapered molding surface; 133, elastic member; 2, rotary drill bit; 21, pick; 22, shotcrete assembly; 24, exhaust pipe; 25, one-way air valve; 26, drill bit tail shank; 27, drill sleeve; 28, sealing member ; 29. ​​Impact drill bit; 31. Spiral blade; 32. First outer tube; 34. Positioning piece; 35. Second outer tube; 36. Gas distribution assembly; 361. Gas distribution seat; 362. First chamber; 363. Inner cylinder; 364. Second chamber; 365. Gas channel; 4. Piston; 41. First air chamber; 42. Second air chamber; 51. Air hole; 52. First ring groove; 53. Second ring groove; 54. Third ring groove; 55. Exhaust channel; 6. Rock and soil layer; 7. Concrete; 8. Bushing. DETAILED DESCRIPTION

[0062] In order to help those skilled in the art better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of this application.

[0063] 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.

[0064] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0065] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout the description of this application, "plurality" or "several" means two or more, unless otherwise specifically defined.

[0066] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the efficacy and purpose that can be achieved by this application.

[0067] The embodiments of the present invention are written in a progressive manner.

[0068] like Figures 1 to 9 As shown, it should be noted that in the drawings of the present application, the single arrow represents the flow direction of the high-pressure gas, and the double arrow represents the flow direction of the slag.

[0069] The embodiment of the utility model provides a long spiral drilling tool, comprising: an inner casing, a grouting channel 111 is provided in the axial direction of the inner casing, and a high-pressure air channel 121 is provided on the outside of the grouting channel 111; a rotary drilling bit 2 movably sleeved on the front end of the inner casing, a cutting tooth 21 is provided on the circumference of the front end of the rotary drilling bit 2, and a spraying assembly 22 connected to the grouting channel 111 is provided on the front end of the rotary drilling bit 2; an outer casing sleeve sleeved on the outside of the inner casing and connected to the rotary drilling bit 2 in transmission, the outer casing sleeve and the rotary drilling bit 2 The outer circumferential surface of the sleeve is provided with a spiral blade 31 for slag discharge; a piston 4 is movably arranged between the inner sleeve and the outer sleeve, a first air chamber 41 is formed between the outer sleeve, the piston 4 and the inner sleeve, and a second air chamber 42 is formed between the piston 4, the rotary drill bit 2, the outer sleeve and the inner sleeve; an air distribution channel is connected to the high-pressure air channel 121, and the air distribution channel is alternately connected to the first air chamber 41 and the second air chamber 42, driving the piston 4 to reciprocate along the axial direction of the inner sleeve to provide a pulse force for the rotary drill bit 2.

[0070] The long spiral drill tool in the prior art includes a power head, a spiral drill rod and a spiral drill bit. The spiral drill bit is fixedly arranged at the front end of the spiral drill rod. A grouting pipe is arranged in the spiral drill rod, a pick is arranged at the front end of the spiral drill bit, and a grouting head is arranged at the front end of the spiral drill bit. In the process of the power head driving the spiral drill rod and the spiral drill bit to rotate, a downward impact force is applied to the spiral drill bit for drilling. After the drilling is completed, the grouting head is opened and concrete is pumped into the grouting pipe. Then, the method of lifting the drill and pouring at the same time is adopted until the concrete is poured to the pile mouth position. After the pouring is completed, the steel cage is inserted into the cast-in-place pile, and the concrete is vibrated with a vibrating hammer when inserting the steel cage to ensure the density of the concrete.

[0071] However, the current difficulty encountered in construction is that when the construction geological conditions include mixed rock layers or the hardness of the rock entering the rock is relatively high, the long spiral rotary drilling method is used to drill holes, and its drilling speed is very slow, which seriously affects the construction progress.

[0072] In order to solve this problem, the long spiral drill provided by the utility model is used to drill holes in the rock and soil layer 6 with mixed rock layers or relatively high rock hardness in the construction working conditions. First, due to the provision of an inner casing, a rotary drilling bit 2 and an outer casing, a grouting channel 111 is axially provided in the inner casing, and a high-pressure air duct 121 is provided on the outside of the grouting channel 111. The grouting channel 111 is used to accommodate and transport concrete 7, and the high-pressure air duct 121 is provided on the outside of the grouting channel 111 for transporting high-pressure gas. The rotary drill bit 2 is movably sleeved on the front end of the inner casing. The front end of the rotary drill bit 2 is circumferentially provided with a cutting tooth 21, which is used to assist in drilling. The front end of the rotary drill bit 2 is also provided with a spraying assembly 22, which is connected to the grouting channel 111. The spraying assembly 22 is used to transport the concrete 7 in the grouting channel 111 into the hole. The outer sleeve is sleeved on the outside of the inner sleeve. The outer sleeve is transmission-connected to the rotary drill bit 2. The outer circumferential surface of the outer sleeve and the rotary drill bit 2 is provided with a spiral blade 31 for slag discharge. During the drilling process, the power head gives the outer sleeve and the rotary drill bit 2 a rotating and downward driving force, and the rotary drill bit 2 breaks the rock. During the rotation of the outer sleeve and the rotary drill bit 2, the rock slag is discharged through the spiral blade 31.

[0073] Secondly, in order to further improve the efficiency of drilling, the long spiral drill provided by the present invention also includes a piston 4 and an air distribution channel, wherein the piston 4 is arranged between the inner sleeve and the outer sleeve, and a first air chamber 41 is formed between the outer sleeve, the piston 4 and the inner sleeve, and a second air chamber 42 is formed between the piston 4, the rotary drill bit 2, the outer sleeve and the inner sleeve, and the air distribution channel is connected to the high-pressure air channel 121. The air distribution channel is alternately connected to the first air chamber 41 and the second air chamber 42, so that an air pressure difference is formed between the first air chamber 41 and the second air chamber 42, pushing the piston 4 to move back and forth along the axial direction of the inner sleeve, thereby providing a pulse force for the rotary drill bit 2, and the processing efficiency is higher. It can be seen that compared with the prior art, the long spiral drill in the embodiment of the present invention is also provided with a piston 4 and an air distribution channel, which can provide a pulse force for the rotary drill bit 2, can increase the drilling speed, and improve the construction efficiency.

[0074] The rotary drill bit 2 in the present application is connected to the inner casing through a transmission. A piston 4, an air distribution channel and a high-pressure air channel 121 are provided between the inner casing and the outer casing. After the high-pressure gas passes through the high-pressure air channel 121 and the air distribution channel, it drives the piston 4 to move axially back and forth, thereby providing a pulse force for the rotary drill bit 2. Compared with the existing technology, it can better improve the drilling efficiency, and can also ensure construction efficiency when the construction working conditions have mixed rock layers or the hardness of the rock entering the rock is relatively high.

[0075] Furthermore, as one of the embodiments, the long spiral drill tool in the embodiment of the present invention also includes an exhaust port, an exhaust pipe 24 and a one-way air valve 25, wherein the exhaust port is arranged on the drilling bit, the exhaust pipe 24 is arranged in the rotary drilling bit 2, the outlet of the exhaust pipe 24 is connected to the exhaust port, and the inlet of the exhaust pipe 24 is alternately connected to the second air chamber 42 and the first air chamber 41, and the one-way air valve 25 is arranged at the end of the exhaust pipe 24. The one-way air valve 25 is used in conjunction with the exhaust port so that the gas can only be discharged from the exhaust port in one direction.

[0076] It should be noted that a one-way air valve 25 is provided at the end of the exhaust pipe 24 so that the exhaust gas in the outer casing can only be discharged to the outside of the outer casing through the exhaust pipe 24, thereby preventing external gas and residue from entering the inside of the outer casing through the exhaust pipe 24.

[0077] Specifically, when the outer sleeve is working, the exhaust gas in the outer sleeve needs to be discharged through the exhaust pipe 24 and the exhaust port. In order to prevent the residue outside the outer sleeve from entering the inner part of the outer sleeve through the exhaust port and the exhaust pipe 24, a one-way air valve 25 is provided at the end of the exhaust pipe 24. The gas can only be discharged from the exhaust port in one direction. The discharged exhaust gas blows up the residue at the bottom of the hole and is discharged through the spiral blade 31.

[0078] As one of the preferred implementations, the exhaust port in the embodiment of the utility model is arranged on the outside of the front end of the rotary drilling bit. The exhaust port is used to discharge waste gas and blow away air residue to improve the slag discharge efficiency.

[0079] In the above structure, as one of the implementation modes, Figure 4 As shown, the inner sleeve in the embodiment of the present invention includes a grouting pipe 11, a joint 12 and a check valve assembly 13, wherein the joint 12 is sleeved on the outside of the rear end of the grouting pipe 11, the joint 12 is sealed and connected to the grouting pipe 11, the grouting channel 111 is arranged through the joint 12 and the grouting pipe 11 in the axial direction, the high-pressure airway 121 is arranged in the joint 12, and the check valve assembly 13 is arranged in the joint 12, and the high-pressure airway 121 is opened and closed by the check valve assembly 13.

[0080] Specifically, when the check valve assembly 13 opens the high-pressure air passage 121, the high-pressure gas is alternately connected to the first air chamber 41 and the second air chamber 42 through the air distribution channel. Due to the high-pressure gas difference between the first air chamber 41 and the second air chamber 42, the piston 4 is pushed to move back and forth along the axial direction of the inner sleeve, and the exhaust gas is discharged from the inside through the exhaust pipe 24.

[0081] More specifically, the high-pressure air passage 121 in the embodiment of the present invention is an air pipe preset in the connector 12 .

[0082] In the above structure, as one embodiment, a connector 12 is provided at the rear end of the joint 12 in the embodiment of the present invention. The connector 12 is used to connect to a drill rod, and concrete 7 is input into the grouting pipe 11 through the drill rod.

[0083] Furthermore, the connector 12 in the embodiment of the present invention is specifically a hexagonal connector 12 .

[0084] As one embodiment, the joint 12 in the embodiment of the utility model is mounted on the outside of the rear end of the grouting pipe 11, and a positioning surface is provided in the joint 12 to abut the rear end surface of the grouting pipe 11, so that a sealed connection is established between the joint 12 and the grouting pipe 11.

[0085] In the above structure, as one of the embodiments, the high-pressure air channel 121 in the embodiment of the present invention includes a first air channel 1211, a second air channel 1212 and a third air channel 1213, wherein the first air channel 1211 is arranged at the rear end of the connector 12, the second air channel 1212 is arranged at the front end of the connector 12, the outlet of the second air channel 1212 is connected to the gas distribution channel, the third air channel 1213 is used to connect the first air channel 1211 and the second air channel 1212, the outlet of the third air channel 1213 extends to the outer surface of the connector 12, the plug 1214 is arranged in the connector 12, and the plug 1214 is arranged at the outlet of the third air channel 1213 to prevent high-pressure gas from leaking from the outlet of the third air channel 1213, and the check valve assembly 13 is arranged at the connection between the first air channel 1211 and the third air channel 1213, and the first air channel 1211 is opened and closed by the check valve assembly 13. Specifically, the high-pressure gas enters the connector 12 from the first gas channel 1211 , and then enters the gas distribution channel through the third channel and the second channel.

[0086] Furthermore, as one of the specific implementation methods, the third air duct 1213 in the embodiment of the utility model is provided with a threaded hole at one end away from the second air duct 1212, and a threaded line is provided on the outer circumferential surface of the plug 1214, and the plug 1214 and the third air duct 1213 are connected by a thread.

[0087] Furthermore, as one of the specific implementation methods, the first air duct 1211 and the second air duct 1212 in the embodiment of the utility model are arranged parallel to the axial direction of the grouting channel 111, the inlet of the first air duct 1211 extends to the rear end of the joint 12, and the outlet of the second air duct 1212 extends to the front end surface of the joint 12, and the third air duct 1213 is used to connect the outlet of the first air duct 1211 and the inlet of the second air duct 1212, and the third air duct 1213 is arranged perpendicular to the first air duct 1211 and the second air duct 1212.

[0088] Furthermore, as one of the implementation modes, Figure 5 As shown, the check valve assembly 13 in the embodiment of the present invention includes a valve stem 131 and an elastic member 133, wherein the rear end of the valve stem 131 is provided with a conical molding surface 132 for opening and closing the first air channel 1211, and the elastic member 133 is connected to the valve stem 131. The elastic member 133 has a compression state and a reset state. When the elastic member 133 is in the compression state, the first air channel 1211 and the third air channel 1213 are connected. When the elastic member 133 is in the reset state, the first air channel 1211 and the third air channel 1213 are isolated.

[0089] As one of the specific implementation methods, the elastic member 133 in the embodiment of the present invention is specifically a spring, and the valve stem 131 includes a blocking section and a guide section, wherein the conical forming surface 132 is arranged on the blocking section, and the outer diameter of the conical forming surface 132 gradually increases from the blocking section to the guide section, and the outer diameter of the guide section is smaller than the maximum outer diameter of the conical forming surface 132. The first air channel 1211 extends along the axial direction of the joint 12, and the valve stem 131 is sleeved on the front end of the first air channel 1211, and the elastic member 133 is sleeved on the outside of the guide section. The two ends of the elastic member 133 are respectively in contact with the blocking section and the outer sleeve. Under the action of high-pressure gas, the valve stem 131 is pushed to move toward the outer sleeve, compressing the elastic member 133. When high-pressure gas is not passed into the high-pressure air channel 121, the elastic member 133 produces elastic reset deformation, pushing the valve stem 131 to close the first channel.

[0090] In the above structure, as one of the embodiments, the outer sleeve in the embodiment of the utility model includes a first outer tube 32, a positioning member 34, a second outer tube 35 and an air distribution assembly 36, wherein the front end of the first outer tube 32 is fixedly connected to the drill sleeve 27, the drill sleeve 27 is transmission-connected to the drill bit, the positioning member 34 is fixedly arranged on the inner side of the first outer tube 32, and the positioning member 34 is used to limit and constrain the axial displacement of the rotary drilling bit 2, the second outer tube 35 is sleeved on the inner side of the first outer tube 32, and the two ends of the second outer tube 35 are respectively abutted against the joint 12 and the positioning member 34, the air distribution assembly 36 is fixedly arranged between the second outer tube 35 and the inner sleeve, and the air distribution assembly 36 is sealed with the inner sleeve, and an air distribution channel is formed between the air distribution assembly 36, the second outer sleeve, the piston 4 and the first outer sleeve for air distribution, thereby pushing the piston 4 to move axially.

[0091] As one specific embodiment, the front end of the first outer tube 32 is sleeved on the outside of the joint 12, and the first outer tube 32 and the joint 12 are connected by a threaded connection. The rear end of the first outer tube 32 is sleeved on the outside of the drill sleeve 27, and the first outer tube 32 and the drill sleeve 27 are connected by a threaded connection. The drill sleeve 27 is sleeved on the outside of the drill bit, and the drill sleeve 27 and the drill bit are connected by a spline transmission.

[0092] Specifically, a positioning groove is provided on the outer surface of the drill bit, the outer ring of the positioning member 34 is fixedly connected to the inner surface of the first outer tube 32, the inner ring of the positioning member 34 is used in conjunction with the positioning groove, the positioning groove is slidably connected to the positioning member 34, and the positioning member 34 abuts against the two end faces of the positioning groove to limit and constrain the axial displacement of the drill bit.

[0093] In the above structure, the structure of the gas distribution assembly 36 in the embodiment of the present utility model can be the gas distribution structure in the impactor in the prior art, which is defined here.

[0094] As one specific implementation method, Figure 2As shown, the gas distribution assembly 36 in the embodiment of the present invention includes a gas distribution seat 361, an inner cylinder 363 and a gas channel 365, wherein the gas distribution seat 361 is fixedly sleeved on the outside of the inner sleeve, and a first chamber 362 is formed between the gas distribution seat 361 and the joint 12, and the first chamber 362 is used to communicate with the high-pressure air channel 121, and the inner cylinder 363 is sleeved on the outside of the front end of the gas distribution seat 361, and the inner cylinder 363 is fixedly connected to the second outer tube 35, and the piston 4 is slidably arranged in the inner cylinder 363, and a second air chamber 42 is formed between the inner cylinder 363 and the second outer tube 35, and the second air chamber 42 is used to communicate with the gas distribution channel, and the gas channel 365 is arranged in the gas distribution seat 361, and is used to communicate with the first chamber 362 and the second chamber 364 through the gas channel 365.

[0095] Furthermore, as one of the embodiments, the outer surface of the grouting pipe 11 in the embodiment of the utility model is provided with a positioning step, which is used to abut against the rear end face of the gas distribution seat 361, and the front end of the gas distribution seat 361 is used to abut against the inner cylinder 363, thereby completing the positioning of the gas distribution seat 361.

[0096] Furthermore, in order to prevent leakage of the gas in the first chamber 362 , a seal 28 is provided between the gas distribution seat 361 and the grouting pipe 11 , and between the grouting pipe 11 and the joint 12 in the embodiment of the present invention.

[0097] Furthermore, the gas distribution channel in the embodiment of the present invention includes an air hole 51, a first annular groove 52, a second annular groove 53, a third annular groove 54 and an exhaust channel 55, wherein the air hole 51 is arranged on the inner cylinder 363, the first annular groove 52 is arranged on the outer surface of the piston 4, and the first annular groove 52 is recessed from the outer surface of the piston 4 toward the axial direction of the piston 4, the second annular groove 53 is arranged on the second outer tube 35, the second annular groove 53 is used to communicate with the second air chamber 42, the second annular groove 53 is recessed from the inner wall of the second outer tube 35 in a direction away from the axis, the third annular groove 54 is arranged on the inner cylinder 363, the third annular groove 54 is used to connect the first annular groove 52 with the first air chamber 41, the third annular groove 54 is recessed from the inner wall of the inner cylinder 363 in a direction away from the axis, and an exhaust channel 55 is formed between the inner wall of the piston 4 and the inner sleeve, and the outlet of the exhaust channel 55 is used to communicate with the exhaust pipe 24.

[0098] Furthermore, the high-pressure air passage 121 in the embodiment of the present invention is connected to the second air chamber 42, and the second chamber 364 is connected to the second air chamber 42 through the air hole 51, the first annular groove 52, and the second annular groove 53. The first annular groove 52 is isolated from the third annular groove 54, thereby pushing the piston 4 to move toward the joint 12. At this time, the piston and the valve seat are in a separated state, and the first air chamber 41 enters the exhaust passage 55 through the gap between the piston and the valve seat. The exhaust gas in the first air chamber 41 is connected to the exhaust pipe 24 through the exhaust passage 55, and the excess gas in the first air chamber 41 is discharged through the exhaust passage 55 and the exhaust pipe 24. When the high-pressure air passage 121 in the embodiment of the present invention is connected to the first air chamber 41, the second chamber 364 is connected to the first air chamber 41 through the air hole 51, the first annular groove 52, and the third annular groove 54. As the piston moves upward, the piston cooperates with the valve seat to isolate the first air chamber 41 from the exhaust passage 55. The outer surface of the piston cooperates with the inner surface of the second outer tube, thereby isolating the first annular groove 52 from the second annular groove 53. At this time, the piston is separated from the bushing 8, and the second air chamber 42 is connected to the exhaust pipe 24 through the exhaust passage 55. The excess exhaust gas in the second air chamber 42 is discharged through the exhaust pipe 24. The piston 4 moves in the axial direction of the inner cylinder 363, thereby switching between the above two states.

[0099] In the above structure, as one of the embodiments, the rotary drilling drill bit 2 in the embodiment of the utility model includes a drill bit tail shank 26, a seal 28 and an impact drill bit 29, wherein the drill bit tail shank 26 is slidably arranged between the outer sleeve and the inner sleeve, the seal 28 is arranged between the drill bit tail shank 26 and the outer sleeve, and between the drill bit tail shank 26 and the inner sleeve, the impact drill bit 29 is arranged on the outside of the outer sleeve, and the impact drill bit 29 is fixedly connected to the drill bit tail shank 26.

[0100] Specifically, the drill bit tail shank 26 in the embodiment of the present invention is coaxially arranged with the piston 4, the drill bit tail shank 26 and the drill clamp sleeve 27 are connected by a spline transmission, the drill clamp sleeve 27 and the first outer tube 32 are connected by a threaded connection, the first seal is arranged between the outer surface of the drill clamp sleeve 27 and the inner wall of the first outer tube 32, and the second seal is arranged between the inner wall of the drill bit tail shank 26 and the outer surface of the inner sleeve.

[0101] Furthermore, as one implementation mode, the rotary drill bit 2 in the embodiment of the present invention further includes a bushing 8 , which is fixedly sleeved on the inner side of the second outer tube 35 .

[0102] Furthermore, a receiving chamber is provided in the impact drill bit 29, which is used to communicate with the grouting channel 111. A spraying assembly 22 is provided at the front end of the impact drill bit 29, which is used to inject concrete 7 into the drill hole when the drill is lifted.

[0103] Furthermore, the impact drill bit 29 and the drill bit shank 26 in the embodiment of the present invention are fixedly connected. Specifically, the impact drill bit 29 and the drill bit shank 26 can be connected by welding.

[0104] The impact drill bit 29 in the embodiment of the present application has the same external structure as the impact drill bit 29 in the existing long spiral drilling tool. The difference from the existing structure is that an exhaust pipe 24 is provided inside the impact drill bit 29, and the drill bit tail handle 26 has the same external structure as the tail handle in the existing down-the-hole impactor. The difference from the existing structure is that a channel connected to the exhaust pipe 24 is provided between the drill bit tail handle 26 and the grouting pipe.

[0105] In the above structure, the exhaust channel in the embodiment of the present utility model is arranged between the drill bit tail shank 26, the piston 4 and the grouting pipe 11. The drill bit tail shank 26 and the piston 4 are coaxially arranged. An annular air groove is provided in the drill bit tail shank 26. The annular air groove is connected to the exhaust channel 55. The annular air groove is recessed from the inner surface of the drill bit tail shank 26 in the direction away from the axis. The rear end of the exhaust pipe 24 is arranged in the drill bit tail shank 26, and the exhaust pipe 24 is connected to the exhaust air duct 55.

[0106] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A long spiral drilling tool, characterized in that: include: An inner casing, wherein a mutually independent grouting channel (111) and a high-pressure air channel (121) are provided in the inner casing, and the high-pressure air channel (121) is provided outside the grouting channel (111); a rotary drill bit (2) movably sleeved on the front end of the inner casing, a cutting tooth (21) being provided circumferentially at the front end of the rotary drill bit (2), and a spraying assembly (22) being provided at the front end of the rotary drill bit (2); An outer sleeve is sleeved on the outside of the inner sleeve and is transmission-connected to the rotary drill bit (2); the outer sleeve and the outer circumferential surface of the rotary drill bit (2) are provided with spiral blades (31) for slag removal; a piston (4) movably arranged between the inner sleeve and the outer sleeve, wherein a first air chamber (41) is formed between the outer sleeve, the piston (4) and the inner sleeve, and a second air chamber (42) is formed between the piston (4), the rotary drill bit (2), the outer sleeve and the inner sleeve; An air distribution channel connected to the high-pressure air channel (121) is alternately connected to the first air chamber (41) and the second air chamber (42), driving the piston (4) to reciprocate along the axial direction of the inner casing to provide a pulse force for the rotary drilling bit (2).

2. The long spiral drilling tool according to claim 1, characterized in that Also includes: An exhaust port provided on the rotary drilling bit (2); an exhaust pipe (24) disposed in the rotary drill bit (2), the exhaust pipe (24) being alternately connected to the second air chamber (42) and the first air chamber (41); A one-way air valve (25) is provided at the end of the exhaust pipe (24), and the one-way air valve (25) is used in conjunction with the exhaust port to allow gas to be discharged from the exhaust pipe (24) in a one-way manner from the exhaust port.

3. The long spiral drilling tool according to claim 2, characterized in that: The inner sleeve comprises: Grouting pipe (11); A joint (12) is sleeved on the outside of the rear end of the grouting pipe (11) and is sealed and connected to the grouting pipe (11); the grouting channel (111) is arranged in the axial direction of the joint (12) and the grouting pipe (11); and the high-pressure air channel (121) is arranged at the front end of the joint (12); A check valve assembly (13) is provided in the joint (12) and is used to open and close the high-pressure air passage (121).

4. The long spiral drilling tool according to claim 3, characterized in that: The high-pressure airway (121) comprises: a first air channel (1211) provided at the rear end of the connector (12); a second air channel (1212) provided at the front end of the connector (12), the outlet of the second air channel (1212) being in communication with the air distribution channel; a third air channel (1213) for connecting the first air channel (1211) and the second air channel (1212), wherein the outlet of the third air channel (1213) extends to the outer surface of the connector (12), and a plug (1214) is provided at the outlet of the third air channel (1213); The check valve assembly (13) is provided at the connection between the first air channel (1211) and the third air channel (1213), and is used to open and close the first air channel (1211).

5. The long spiral drilling tool according to claim 4, characterized in that: The check valve assembly (13) comprises: A valve stem (131), wherein the rear end of the valve stem (131) is provided with a tapered molding surface (132) for opening and closing the first air channel (1211); An elastic member (133) connected to the valve stem (131) has a compression state and a reset state. When the elastic member (133) is in the compression state, the first air channel (1211) is connected to the third air channel (1213). When the elastic member (133) is in the reset state, the first air channel (1211) is isolated from the third air channel (1213).

6. The long spiral drilling tool according to any one of claims 2 to 5, characterized in that: The outer sleeve comprises: a first outer tube (32), the front end of the first outer tube (32) being in transmission connection with the rotary drill bit (2); A positioning member (34) fixedly disposed in the first outer tube (32) and used for limiting and restraining the axial displacement of the rotary drilling bit (2); a second outer tube (35) sleeved inside the first outer tube (32), with both ends of the second outer tube (35) respectively abutting against the joint (12) and the positioning member (34); An air distribution component (36) is fixedly sleeved between the second outer tube (35) and the inner sleeve, and the air distribution component (36) and the inner sleeve are sealed.

7. The long spiral drilling tool according to claim 6, characterized in that: The gas distribution assembly (36) comprises: A gas distribution seat (361) is fixedly sleeved on the outside of the inner sleeve, and a first chamber (362) is formed between the gas distribution seat (361) and the joint (12), and the first chamber (362) is used to communicate with the high-pressure air channel (121); An inner cylinder (363) is mounted on the outside of the front end of the valve seat (361) and is fixedly connected to the second outer tube (35). The piston (4) is slidably disposed in the inner cylinder (363). A second chamber (364) is formed between the inner cylinder (363) and the second outer tube (35). A gas passage (365) is provided in the gas distribution seat (361) and is used to connect the first chamber (362) and the second chamber (364).

8. The long spiral drilling tool according to claim 7, characterized in that: The gas distribution channel includes: an air hole (51) provided on the inner cylinder (363) and communicating with the second chamber (364); a first annular groove (52) provided on the piston (4), the first annular groove (52) being recessed from the outer circumferential surface of the piston (4) toward the axial direction of the piston (4); a second annular groove (53) provided on the second outer tube (35) and communicating with the second air chamber (42), wherein the second annular groove (53) is recessed from the inner wall of the second outer tube (35) in a direction away from the axis; A third annular groove (54) is provided on the inner cylinder (363) and is used to connect the second annular groove (53) and the first air chamber (41), wherein the third annular groove (54) is recessed from the inner wall of the inner cylinder (363) in a direction away from the axis; An exhaust channel (55) is formed between the inner wall of the piston (4) and the inner sleeve, and an outlet of the exhaust channel (55) is communicated with the exhaust pipe (24).

9. The long spiral drilling tool according to claim 8, characterized in that: When the air distribution channel is in communication with the second air chamber (42), the second chamber (364) is in communication with the second air chamber (42) through the first annular groove (52) and the second annular groove (53), and the first air chamber (41) is in communication with the exhaust pipe (24) through the exhaust channel (55); When the air distribution channel is in communication with the first air chamber (41), the second chamber (364) is in communication with the first air chamber (41) through the first annular groove (52), the second annular groove (53) and the third annular groove (54), and the second air chamber (42) is in communication with the exhaust pipe (24) through the exhaust channel (55).

10. The long spiral drilling tool according to any one of claims 1 to 5 and 7 to 9, characterized in that: The rotary drilling bit (2) comprises: A drill bit tail shank (26) is arranged between the outer sleeve and the inner sleeve, and the drill bit tail shank (26) is connected to the outer sleeve via a drill clamping sleeve (27); a sealing member (28) provided between the drill bit shank (26) and the outer sleeve, and between the drill bit shank (26) and the inner sleeve; An impact drill bit (29) is arranged at the front end of the drill bit shank (26) and is fixedly connected to the drill bit shank (26).

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