A coring drill tool for replacing drill bits without lifting the drill

Abstract

The present invention belongs to the field of geological exploration technology, and in particular relates to a coring drill tool that allows the drill bit to be replaced without lifting the drill. The outer circumferential surface of the first circular tube of the coring drill tool connecting pipe is not coaxial with the outer circumferential surface of the second circular tube, and the inner hole of the first circular tube is coaxial with the outer circumferential surface of the second circular tube; the inner hole of the reamer is not coaxial with the outer circumferential surface of the reamer; and the inner hole of the drill bit is not coaxial with the outer circumferential surface of the drill bit. During drilling, the connecting pipe rotates until the inner hole of the first circular tube is not coaxial with the outer circumferential surface of the reamer, at which point the outer circumferential surface of the reamer is not coaxial with the outer circumferential surface of the drill bit. During salvaging, the connecting pipe rotates until the inner hole of the first circular tube is coaxial with the outer circumferential surface of the reamer, at which point the outer circumferential surface of the reamer is coaxial with the outer circumferential surface of the drill bit. Thus, the coring drill tool changes the outer diameters of the reamer and the drill bit by controlling the coordination between the connecting pipe and the reamer, thereby achieving an eccentric drilling position and a concentric salvaging position, achieving both coring and drill bit replacement.

Description

Technical Field

[0001] The invention belongs to the technical field of geological exploration, and in particular relates to a coring drill tool for replacing a drill bit without lifting the drill. Background Art

[0002] Geological exploration involves surveying and detecting the geology through various means and methods to determine the appropriate bearing layer. The geological foundation type is then determined based on the bearing capacity of the bearing layer. Drilling technology, as a form of geological exploration, can calculate basic geological parameters. Wireline coring drilling is an advanced core drilling process. The drill bit used for wireline coring drilling has an inner tube assembly encased within its outer tube, which includes a coring barrel. During drilling, the core is slowly loaded into the coring barrel. Once the core fills the barrel, a rope-mounted salvage device is used to lift the inner tube assembly from the outer tube, collect the core, and then lower it to the bottom of the hole to continue drilling.

[0003] However, due to the wear of the drill bit and the change of the rock formation, the drill bit needs to be replaced from time to time. Therefore, in the rope coring drilling technology, a lifting drill rod for replacing and inspecting the drill bit is also required to perform the drill rod lifting operation. Adding another drill rod lifting operation during the drilling work will affect the original drilling work, resulting in short pure drilling time and low drilling efficiency. Summary of the Invention

[0004] (1) Technical issues to be resolved

[0005] In order to solve the above problems in the prior art, the present invention provides a coring drill tool that does not require lifting the drill to replace the drill bit, thereby solving the technical problem of low drilling efficiency.

[0006] (2) Technical solution

[0007] In order to achieve the above objectives, the main technical solutions adopted by the present invention include:

[0008] The present invention provides a coring drill tool for replacing a drill bit without lifting the drill, comprising an inner tube, the inner tube comprising a connecting tube, the connecting tube comprising a first circular tube and a second circular tube connected in sequence, the outer diameter of the first circular tube being smaller than the outer diameter of the second circular tube, the outer cylindrical surface of the first circular tube being not coaxial with the outer cylindrical surface of the second circular tube, and the inner hole of the first circular tube being coaxial with the outer cylindrical surface of the second circular tube; the coring drill tool further comprises a reamer, the inner hole of the reamer being not coaxial with the outer cylindrical surface of the reamer, and the reamer being rotatably sleeved outside the first ... The drill bit comprises a drill bit, which comprises an inner hole and an outer cylindrical surface of the drill bit. The inner hole of the drill bit and the outer cylindrical surface of the drill bit are not coaxial. The drill bit is sleeved on the front end of a first circular tube, and a reamer is located between the drill bit and the second circular tube. When drilling, the connecting tube is rotated until the inner hole of the first circular tube and the outer cylindrical surface of the reamer are not coaxial. At this time, the outer cylindrical surface of the reamer is not coaxial with the outer cylindrical surface of the drill bit. When salvaging, the connecting tube is rotated until the inner hole of the first circular tube and the outer cylindrical surface of the reamer are coaxial. At this time, the outer cylindrical surface of the reamer is coaxial with the outer cylindrical surface of the drill bit.

[0009] Furthermore, a large arc hole and a small arc hole are provided in the reamer to enclose the inner hole of the reamer. The large arc hole and the small arc hole are coaxial. The first end face and the second end face are formed at the connection between the two ends of the large arc hole and the small arc hole respectively. The concave surface formed by the first end face, the second end face and the large arc hole is an eccentric keyway. An eccentric key with an arc surface at the upper end is provided on the first circular tube. The arc surface is coaxial with the outer circular surface of the first circular tube, and the eccentric keyway cooperates with the eccentric key. The outer diameter of the reamer, the outer diameter of the drill bit and the outer diameter of the second circular tube are all the same.

[0010] Furthermore, the inner tube also includes an inner tube assembly, and the inner tube assembly includes a core tube, which runs through the interior of the connecting tube. A fixing component is connected to the core tube to fix the core tube axially.

[0011] Furthermore, the drill bit also includes a coring inner hole, which is coaxial with the outer cylindrical surface of the drill bit. When drilling, the front end of the coring tube is located in the drill bit and is coaxial with the coring inner hole.

[0012] Furthermore, the connecting tube also includes a third circular tube connected to the second circular tube, the third circular tube is coaxial with the second circular tube, and the outer diameter of the third circular tube is smaller than the outer diameter of the second circular tube; the fixed component includes a spring card and a spring card chamber, the spring card is fixed to the tail end of the core sampling tube, the spring card chamber is cylindrical, the spring card chamber is sleeved on the outside of the tail end of the third circular tube and fixedly connected to the third circular tube, and the spring card is located in the spring card chamber and engages with the spring card chamber.

[0013] Furthermore, the coring drill also includes an outer tube, which includes a connecting frame and a shell. The connecting frame is cylindrical and is sleeved on the front end of the second circular tube, and the front end face of the connecting frame is aligned with the front end face of the second circular tube; the rear end face of the reamer is against the front end face of the second circular tube; the shell is cylindrical and is sleeved on the outside of the inner tube, and the shell is fixedly connected to the tail end of the connecting frame.

[0014] Furthermore, the coring drill also includes a salvage mechanism, which is located in the shell and includes an integrally formed heavy hammer and a salvage hook; the inner tube assembly also includes a connecting shaft, which is arranged in the spring card and passes through the spring card chamber. A connecting hole is provided in the center of the heavy hammer, and the connecting shaft is fixed in cooperation with the connecting hole. The salvage hook is located at the tail end of the shell.

[0015] Furthermore, a sealing piston is provided in the space enclosed by the second circular tube, the third circular tube, the ejection chamber and the shell, and the third circular tube is passed through the inner hole of the sealing piston.

[0016] Furthermore, a guide assembly is provided at the joint between the connecting frame and the second round tube.

[0017] Furthermore, the guide assembly includes a guide spline arranged on the outer surface of the front end of the second circular tube and a guide spline groove arranged in the connecting frame.

[0018] (3) Beneficial effects

[0019] The beneficial effects of the present invention are:

[0020] The present invention provides a coring drill tool that does not require lifting the drill to replace the drill bit. By controlling the cooperation between the connecting pipe and the reamer, the outer diameters of the reamer and the drill bit can be changed, thereby obtaining an eccentric drilling position and a concentric salvage position, achieving the purpose of having a coring function while also being able to complete the replacement of the drill bit.

[0021] The present invention can replace the drill bit without lifting the drill rod and lifting the drill tool as a whole, which greatly shortens the drill bit replacement time. At the same time, it can also complete drilling, coring and other actions, providing convenient and simple operation for geological exploration, improving the overall drilling efficiency and saving drilling costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the cross-sectional structure of a coring drill tool for replacing the drill bit without lifting the drill;

[0023] Figure 2 Schematic diagram of the structure of the connecting pipe;

[0024] Figure 3 Schematic diagram of the structure of the connecting frame;

[0025] Figure 4 Schematic diagram of the structure of the reamer;

[0026] Figure 5 Schematic diagram of the drill bit structure;

[0027] Figure 6 This is a schematic diagram of the position structure of the drill bit, reamer and connecting pipe during drilling;

[0028] Figure 7This is a schematic diagram of the position structure of the drill bit, reamer and connecting pipe during salvage.

[0029] [Description of Reference Numerals]

[0030] 1: Inner tube; 11: Connecting tube; 111: First round tube; 112: Second round tube; 113: Eccentric key; 114: Third round tube; 12: Inner tube assembly; 121: Coring tube; 122: Fixing assembly; 1221: Spring clip; 1222: Spring clip chamber; 12221: Spring clip chamber hole; 123: Connecting shaft;

[0031] 2: reamer; 21: large arc hole; 22: small arc hole; 23: first end surface; 24: second end surface;

[0032] 3: drill bit; 31: drill bit inner hole; 32: drill bit outer surface; 33: core inner hole;

[0033] 4: outer tube; 41: connecting frame; 42: shell;

[0034] 5: guide assembly; 51: guide spline; 52: guide spline groove;

[0035] 6: Sealing piston;

[0036] 7: Salvage mechanism; 71: Heavy hammer; 72: Salvage hook. DETAILED DESCRIPTION

[0037] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. Instead, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0038] like Figure 1-7 As shown, the present invention provides a coring drill tool that does not require the drill to be lifted and the drill bit to be replaced, such as Figure 1As shown, it includes an inner tube 1, a reamer 2, a drill bit 3, an outer tube 4, and a salvage mechanism 7. The reamer 2 and drill bit 3 are integrated into the inner tube 1, and the outer tube 4 is then connected to the drill pipe and drilling rig to transmit power. Specifically, the outer tube 4 includes a connecting frame 41 and a housing 42, which is then connected to the drill pipe and drilling rig (not shown). The inner tube 1 includes a connecting pipe 11 and an inner tube assembly 12. The inner tube assembly 12 includes a coring tube 121 for coring. The drill bit 3 and reamer 2 are connected to the connecting pipe 11, which is connected to the connecting frame 41. The connecting frame 41 is then connected to the housing 42, and the connecting pipe 11 is connected to the inner tube assembly 12, thus forming an inner and outer double tube. The salvage mechanism 7 is connected to the inner tube assembly 12 and is located within the housing 42. When salvaging the inner tube 1, a salvage device with a rope is connected to the salvage mechanism 7 for salvaging.

[0039] like Figure 1 、 Figure 2 As shown, the connecting tube 11 includes a first circular tube 111, a second circular tube 112, and a third circular tube 114 connected in sequence. The outer diameters of the first circular tube 111 and the third circular tube 114 are both smaller than the outer diameter of the second circular tube 112. The outer circumferential surface of the first circular tube 111 is not coaxial with the outer circumferential surface of the second circular tube 112. The inner hole of the first circular tube 111 is coaxial with the outer circumferential surface of the second circular tube 112, and the third circular tube 114 is coaxial with the second circular tube 112. The axis of the inner hole of the first circular tube 111 is denoted as axis A, and the axis of the outer circumferential surface of the first circular tube 111 is denoted as axis B.

[0040] like Figure 4 As shown, the reamer 2 has two axes. The inner hole of the reamer 2 is not coaxial with the outer circumference of the reamer 2. The axis of the inner hole of the reamer 2 is denoted as axis C, and the axis of the outer circumference of the reamer 2 is denoted as axis D. The reamer 2 is rotatably mounted outside the first circular tube 111 until its rear end face abuts against the front end face of the second circular tube 112.

[0041] like Figure 5 As shown, the drill bit 3 has two axes, including a drill bit inner hole 31, a drill bit outer surface 32, and a coring inner hole 33. The axis of the drill bit outer surface 32 is denoted as axis E, and the axis of the drill bit inner hole 31 is denoted as axis F. The drill bit inner hole 31 and the drill bit outer surface 32 are not coaxial, while the coring inner hole 33 and the drill bit outer surface 32 are coaxial. When drilling, the front end of the coring tube 121 is located inside the drill bit 3 and is coaxial with the coring inner hole 33. The front end of the first circular tube 111 is threaded, and the rear portion of the drill bit 3 is sleeved on the front end of the first circular tube 111 and is threadedly connected to the first circular tube 111. The front portion of the drill bit 3 protrudes forward from the first circular tube 111. Furthermore, a screw can be added to the threaded connection to prevent the drill bit 3 from falling when the connecting tube 11 is reversed, thereby ensuring the reliability of the connection.

[0042] like Figure 1As shown, the reamer 2 is located between the drill bit 3 and the second round tube 112. The outer diameters of the reamer 2, the drill bit 3, and the second round tube 112 are all the same. This ensures that when the inner tube 1 is salvaged, the reamer 2 and the drill bit 3 can be salvaged together.

[0043] Specifically, during drilling, the connecting pipe 11 rotates until the inner hole of the first circular pipe 111 is not coaxial with the outer circumferential surface of the reamer 2 . At this time, the outer circumferential surface of the reamer 2 is not coaxial with the outer circumferential surface 32 of the drill bit.

[0044] During salvaging, the connecting pipe 11 is rotated until the inner hole of the first circular pipe 111 is coaxial with the outer circumferential surface of the reamer 2 . At this time, the outer circumferential surface of the reamer 2 is coaxial with the outer circumferential surface 32 of the drill bit.

[0045] In this embodiment, if Figure 2 As shown, the first circular tube 111 is provided with an eccentric key 113 with an arc surface at the upper end, and the arc surface is coaxial with the outer circumference of the first circular tube 111. Figure 4 As shown, the reamer 2 is provided with a large arc hole 21 and a small arc hole 22 that enclose the inner hole of the reamer 2. The large arc hole 21 and the small arc hole 22 are coaxial. The junction of the large arc hole 21 and the small arc hole 22 forms a first end face 23 and a second end face 24, respectively. The concave surface formed by the first end face 23, the second end face 24 and the large arc hole 21 is an eccentric keyway, which cooperates with the eccentric key 113. Under the drive of the drilling rig, the eccentric key 113 rotates in the eccentric keyway, causing the first circular tube 111 and the reamer 2 to move relative to each other, thereby realizing the functions of the reamer 2 to expand the hole and salvage the reamer 2 and the drill bit 3.

[0046] like Figure 3 As shown, the connecting frame 41 is cylindrical and sleeved onto the front end of the second circular tube 112, with the front end of the connecting frame 41 aligned with the front end of the second circular tube 112. The distance between the rear end of the drill bit 3 and the front end of the connecting frame 41 is exactly the length of the reamer 2. The drill bit 3, reamer 2, and connecting frame 41 fit tightly together, and tolerance control ensures uninterrupted transmission of the bit pressure.

[0047] like Figure 1 As shown, the housing 42 is cylindrical and sleeved outside the inner tube 1, and is fixedly connected to the rear end of the connecting frame 41. This ensures that the inner tube 1 and the outer tube 4 are mated, and torque can be transmitted to the drill bit 3 under the drive of the drilling rig. A guide assembly 5 is provided at the joint between the connecting frame 41 and the second circular tube 112 to ensure that the inner tube 1 and the outer tube 4 can be properly mated at any angle, while also ensuring the circumferential fixation of the inner tube 1 and the outer tube 4, ensuring the transmission of torque from the drilling rig, so that the drill bit 3 can rotate and cut during drilling. This transmission method is more efficient, has a higher safety factor, and is also simple to operate.

[0048] In this embodiment, if Figure 2 、 Figure 3 As shown, the guide assembly 5 adopts a spline structure with guiding properties, including a guide spline 51 arranged on the front end outer surface of the second round tube 112 and a guide spline groove 52 arranged in the connecting frame 41, which cooperate with each other.

[0049] like Figure 1 As shown, the core tube 121 passes through the interior of the connecting tube 11, and a fixing assembly 122 is connected to the rear of the core tube 121 to fix the core tube 121 axially. The fixing assembly 122 includes a spring clip 1221 and a spring clip chamber 1222. The spring clip 1221 is fixed to the tail end of the core tube 121. The spring clip chamber 1222 is cylindrical and sleeved on the outside of the tail end of the third circular tube 114 and is threadedly connected to the third circular tube 114. The spring clip 1221 is located in the spring clip chamber 1222 and engages with the spring clip chamber 1222. When the inner tube assembly 12 is lowered along the shell 42, the spring clip 1221 opens a certain angle and engages with the inner wall of the spring clip chamber 1222 to prevent the inner tube 1 from moving upward.

[0050] like Figure 1 As shown, the salvage mechanism 7 includes an integrally formed weight hammer 71 and a salvage hook 72; the inner tube assembly 12 also includes a connecting shaft 123, which is arranged in the ejection card 1221 and passes through the ejection card chamber 1222. A connecting hole is provided in the center of the weight hammer 71, and the connecting shaft 123 is fixed in conjunction with the connecting hole. The salvage hook 72 is located at the rear end of the shell 42, so that when the salvage device salvages the inner tube assembly 12, the inner tube 1 can be salvaged together.

[0051] like Figure 1 As shown, a sealing piston 6 is disposed within the space enclosed by the second circular tube 112, the third circular tube 114, the ejection chamber 1222, and the housing 42. The third circular tube 114 extends through the inner hole of the sealing piston 6. The sealing piston 6 seals the gap between the housing 42 and the second circular tube 112, allowing mud entering the housing 42 to flow through the ejection chamber hole 12221 into the inner tube assembly 12, providing a mud cooling circulation channel for the drill bit 3 and the reamer 2. Furthermore, the sealing piston 6 ensures that the core drilling tool is lowered into place under the action of the mud.

[0052] Working principle: During drilling, the inner tube 1 is lowered. Under the action of mud, the drill bit 3 and the reamer 2 are pressed into place along with the inner tube assembly 12. The inner tube 1 and the outer tube 4 are integrated by the cooperation of the guide spline 51 and the guide spline groove 52. The inner tube 1 and the outer tube 4 can be driven to rotate as a whole by the drilling rig and drill forward together. After the inner tube 1 and the outer tube 4 are integrated, the drilling rig starts to rotate forward to provide a power source to transmit torque, so that the eccentric key 113 is close to the first end face 23. At this time, the axis A of the inner hole of the first circular tube 111 deviates from the axis D of the outer cylindrical surface of the reamer 2. The axis D of the outer cylindrical surface of the reamer 2 is not coaxial with the axis E of the outer cylindrical surface 32 of the drill bit. The distance between the outer surface of the reamer 2 and the central axis of the inner tube assembly 12 is greater than the distance between the outer surface of the drill bit 3 at the same position as the outer surface of the reamer 2 and the central axis of the inner tube assembly 12, thereby achieving the function of reaming and cutting.

[0053] During salvage, the drilling rig is reversed and the eccentric key 113 is in close contact with the second end face 24. At this time, the axis A of the inner hole of the first circular tube 111 is coaxial with the axis D of the outer cylindrical surface of the reamer 2, and the axis D of the outer cylindrical surface of the reamer 2 is coaxial with the axis E of the outer cylindrical surface 32 of the drill bit. Since the outer diameters of the reamer 2, the drill bit 3 and the second circular tube 112 are all the same, the drill bit 3 and the reamer 2 can be salvaged from the outer tube 4 together with the inner tube assembly 12 through the inner hole of the connecting frame 41 for coring or replacement of the drill bit.

[0054] In summary, the present invention provides a coring drill tool for replacing the drill bit without lifting the drill, which can complete the action of replacing the drill bit without removing the drill, and can also complete the actions of drilling and coring at the same time, thereby simplifying the operating process and being simple and reliable.

[0055] In the description of this specification, the terms "one embodiment", "some embodiments", "embodiments", "examples", "specific examples" or "some examples" refer to the specific features, structures, materials or characteristics described in conjunction with the embodiment or example and included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without contradiction.

[0056] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may alter, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A coring drill tool for replacing a drill bit without lifting the drill, comprising an inner tube (1), wherein the inner tube (1) includes a connecting tube (11), and is characterized in that: The connecting tube (11) comprises a first circular tube (111) and a second circular tube (112) connected in sequence, the outer diameter of the first circular tube (111) is smaller than the outer diameter of the second circular tube (112), the outer circular surface of the first circular tube (111) and the outer circular surface of the second circular tube (112) are not coaxial, and the inner hole of the first circular tube (111) and the outer circular surface of the second circular tube (112) are coaxial; The coring drill tool further comprises a reamer (2), the inner hole of the reamer (2) and the outer circumferential surface of the reamer (2) are not coaxial, and the reamer (2) is rotatably sleeved outside the first circular tube (111); The coring drill tool further comprises a drill bit (3), the drill bit (3) comprising a drill bit inner hole (31) and a drill bit outer circular surface (32), the drill bit inner hole (31) and the drill bit outer circular surface (32) being non-coaxial, the drill bit (3) being sleeved on the front end of the first circular tube (111), and the reamer (2) being located between the drill bit (3) and the second circular tube (112); When drilling, the connecting pipe (11) is rotated until the inner hole of the first circular pipe (111) is not coaxial with the outer circumferential surface of the reamer (2). At this time, the outer circumferential surface of the reamer (2) is not coaxial with the outer circumferential surface (32) of the drill bit. When salvaging, the connecting pipe (11) is rotated until the inner hole of the first circular pipe (111) is coaxial with the outer circumferential surface of the reamer (2). At this time, the outer circumferential surface of the reamer (2) is coaxial with the outer circumferential surface (32) of the drill bit; The coring drill tool further comprises an outer tube (4) and a salvage mechanism (7); the outer tube (4) is connected to a drill pipe and a drilling rig to transmit power; the inner tube (1) further comprises an inner tube assembly (12); the outer tube (4) comprises a shell (42); the salvage mechanism (7) and the inner tube assembly (12) are connected and located inside the shell (42); the outer diameter of the reamer (2), the outer diameter of the drill bit (3) and the outer diameter of the second circular tube (112) are the same.

2. The coring drill tool for replacing the drill bit without lifting the drill according to claim 1, characterized in that: The reamer (2) is provided with a large arc hole (21) and a small arc hole (22) which enclose the inner hole of the reamer (2); the large arc hole (21) and the small arc hole (22) are coaxial; the large arc hole (21) and the small arc hole (22) are connected at both ends to form a first end face (23) and a second end face (24); the concave surface formed by the first end face (23), the second end face (24) and the large arc hole (21) is an eccentric key groove; the first circular tube (111) is provided with an eccentric key (113) with an arc surface at the upper end; the arc surface is coaxial with the outer circular surface of the first circular tube (111); the eccentric key groove cooperates with the eccentric key (113).

3. The coring drill tool for replacing the drill bit without lifting the drill according to claim 1, characterized in that: The inner tube assembly (12) comprises a core tube (121), the core tube (121) passes through the interior of the connecting tube (11), and a fixing assembly (122) is connected to the back of the core tube (121) to fix the core tube (121) axially.

4. The coring drill tool for replacing the drill bit without lifting the drill according to claim 3, characterized in that: The drill bit (3) further comprises a core inner hole (33), wherein the core inner hole (33) is coaxial with the drill bit outer surface (32). When drilling, the front end of the core tube (121) is located in the drill bit (3) and is coaxial with the core inner hole (33).

5. The coring drill tool for replacing the drill bit without lifting the drill according to claim 3, characterized in that: The connecting tube (11) further comprises a third circular tube (114) connected to the second circular tube (112), the third circular tube (114) being coaxial with the second circular tube (112), and the outer diameter of the third circular tube (114) being smaller than the outer diameter of the second circular tube (112); The fixing assembly (122) comprises a spring clip (1221) and a spring clip chamber (1222); the spring clip (1221) is fixed to the tail end of the core tube (121); the spring clip chamber (1222) is cylindrical; the spring clip chamber (1222) is sleeved on the outside of the tail end of the third circular tube (114) and is fixedly connected to the third circular tube (114); the spring clip (1221) is located in the spring clip chamber (1222) and is engaged with the spring clip chamber (1222).

6. The coring drill tool for replacing the drill bit without lifting the drill according to claim 5, characterized in that: The outer tube (4) further comprises a connecting frame (41), the connecting frame (41) being cylindrical and being sleeved on the front end of the second circular tube (112), the front end surface of the connecting frame (41) being aligned with the front end surface of the second circular tube (112); The rear end face of the reamer (2) abuts against the front end face of the second circular tube (112); The shell (42) is cylindrical and is sleeved outside the inner tube (1). The shell (42) is fixedly connected to the tail end of the connecting frame (41).

7. The coring drill tool for replacing the drill bit without lifting the drill according to claim 6, characterized in that: The salvaging mechanism (7) comprises an integrally formed weight hammer (71) and a salvaging hook (72); The inner tube assembly (12) further includes a connecting shaft (123), which is disposed in the spring clip (1221) and passes through the spring clip chamber (1222). A connecting hole is provided at the center of the weight hammer (71), and the connecting shaft (123) is fixedly engaged with the connecting hole. The salvage hook (72) is located at the tail end of the housing (42).

8. The coring drill tool for replacing the drill bit without lifting the drill according to claim 6, characterized in that: A sealing piston (6) is provided in the space enclosed by the second circular tube (112), the third circular tube (114), the ejection chamber (1222) and the housing (42), and the third circular tube (114) is passed through the inner hole of the sealing piston (6).

9. The coring drill tool for replacing the drill bit without lifting the drill according to claim 6, characterized in that: A guide assembly (5) is provided at the joint between the connecting frame (41) and the second circular tube (112).

10. The coring drill tool for replacing the drill bit without lifting the drill according to claim 9, characterized in that: The guide assembly (5) comprises a guide spline (51) provided on the outer surface of the front end of the second circular tube (112) and a guide spline groove (52) provided in the connecting frame (41).

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