Rope-free coring drilling tool for pressing super-long horizontal hole

Abstract

The utility model relates to the technical field, in particular to a cordless coring drilling tool for pressing a super-long horizontal hole, which is characterized in that a spearhead is arranged at the front end of a drill bit; the spearhead is embedded into the drill bit; the fishing spearhead is arranged on the spearhead seat; a positioning spring is arranged at the front end of the spearhead seat; a positioning pin is arranged in the positioning spring; the front end of the positioning spring is connected with a rolled elastic pin; the rear part of the spearhead seat is connected to the connecting pipe A; an inner recovery rod is arranged in the connecting pipe A and is connected with the spearhead seat; an elastic clamping plate is arranged at the tail part of the connecting pipe A; the rear part of the connecting pipe A is connected with a connecting pipe B; the rear end of the connecting pipe B is connected with a mandrel; the tail part of the mandrel is arranged in the sliding sleeve; the tail part of the sliding sleeve is connected to the core barrel; the core barrel is connected to the tail of the drill bit; according to the cordless coring drilling tool for the ultra-long horizontal hole, the problem that coring drilling efficiency of the ultra-long horizontal hole is low is solved, the cordless coring drilling tool for the ultra-long horizontal hole is researched, delivery and recovery of the inner pipe are completed through hydraulic driving, the mechanical inner pipe fishing technology is omitted, and the purposes of improving the coring drilling efficiency and simplifying the technological process are achieved. And a good foundation can be laid for constructing a novel process technology system for efficient coring drilling of the ultra-long horizontal hole.

Description

Technical Field

[0001] The utility model relates to the technical field, and particularly relates to a cordless core drill for pressing ultra-long horizontal holes. Background Technique

[0002] Tunnel exploration methods mainly include geophysical exploration, remote sensing, drilling, regional geological survey, etc. Among them, drilling is the most direct and effective means to reveal deep geological conditions. The wireline coring drilling technology is one of the typical representatives of coring drilling technology, with the characteristics of high coring efficiency, good core sampling quality, and low cost. However, most of the complex and dangerous areas are uninhabited areas with steep terrain and difficult mountain roads, making it inconvenient for material transportation; the relocation of drilling equipment is extremely difficult, and even difficult to implement. At the same time, the vertical borehole exploration method has the disadvantages of discrete boreholes, a large amount of ineffective footage, and discontinuous underground physical samples, resulting in the inapplicability of the traditional vertical borehole coring method to tunnel exploration in complex and dangerous areas. Therefore, it is urgent to seek new coring technologies to solve the above problems, and the horizontal coring drilling technology has become an important technical means to solve the above problems. This technology has the following characteristics: (1) Horizontal coring drilling can conduct directional coring along the tunnel axis to obtain more representative underground physical samples; (2) Compared with vertical boreholes, horizontal borehole exploration has fewer layout points, which not only saves a large amount of equipment relocation work, but also effectively reduces the damage to the ecologically fragile area caused by the construction of the drilling site. Content of the Utility Model

[0003] The purpose of the utility model is to provide a cordless core drill for pressing ultra-long horizontal holes. In order to solve the problem of low coring drilling efficiency for ultra-long horizontal holes, the present invention has studied a set of cordless core drills for ultra-long horizontal holes, which complete the delivery and recovery of the inner tube through hydraulic drive, get rid of the mechanical inner tube fishing technology, and achieve the purpose of improving coring drilling efficiency and simplifying the process flow, so as to lay a good foundation for constructing a new process technology system for efficient coring drilling of ultra-long horizontal holes.

[0004] To solve the above technical problems, the utility model adopts the following technical solutions:

[0005] A cordless core drill for pressing ultra-long horizontal holes, characterized in that it includes a fishing spearhead, a rolled elastic pin, a positioning pin, a positioning spring, a spearhead seat, an inner recovery rod, an upper joint, a connecting pipe A, an outer pipe connecting pipe, a spring clip plate, a connecting pipe B, a sealing ring, a suspension ring, a seat ring, a core shaft, a sliding sleeve, a cylindrical return spring, a thrust ball bearing, a first adjusting nut, a stainless steel ball, a return spring, an upper joint of the core barrel, a core barrel, a centralizer ring, a retaining ring for the split collet, a split collet, a split collet seat and a drill bit; a fishing spearhead is provided at the front end of the drill bit; the fishing spearhead is embedded inside the drill bit; the fishing spearhead is arranged on the spearhead seat; a positioning spring is provided at the front end of the spearhead seat; a positioning pin is arranged inside the positioning spring; a rolled elastic pin is connected to the front end of the positioning spring; the rear part of the spearhead seat is connected to the connecting pipe A; the inner recovery rod is arranged inside the connecting pipe A to connect the spearhead seat; a spring clip plate is provided at the tail of the connecting pipe A; the rear part of the connecting pipe A is connected to the connecting pipe B; the rear end of the connecting pipe B is connected to the core shaft; the tail of the core shaft is arranged inside the sliding sleeve; the tail of the sliding sleeve is connected to the core barrel; the core barrel is connected to the tail of the drill bit; the drill bit is arranged inside the outer pipe.

[0006] Furthermore, two spring clip plates are symmetrically arranged; the front ends of the spring clip plates are on the elastic cylindrical pins; a torsion spring is arranged on the elastic cylindrical pins; the rear sides of the spring clip plates are clamped and arranged inside the spring clip chamber; the spring clip chamber is arranged on the inner wall of the outer pipe connecting pipe; a guiding elastic pin is arranged in the middle of the spring clip plate.

[0007] Furthermore, a cylindrical compression spring is arranged at the tail of the connecting pipe B to connect the core shaft; a sealing piston is arranged at the front end of the cylindrical compression spring; a water inlet A is arranged on the side of the sealing piston.

[0008] Furthermore, a cylindrical return spring is arranged at the tail of the core shaft; the cylindrical return spring is sleeved on the central rod; the tail of the central rod is fixedly arranged on the sliding sleeve through the first adjusting nut; a thrust ball bearing is arranged between the cylindrical return spring and the first adjusting nut.

[0009] Furthermore, at the connection between the sliding sleeve and the core barrel; a stainless steel ball is arranged at the front end of the core barrel; the stainless steel ball is connected to the front end of the core barrel through a return spring; a cavity is arranged at the rear part of the sliding sleeve; the stainless steel ball is arranged inside the cavity.

[0010] Furthermore, a split collet is arranged at the connection between the bottom of the core barrel and the drill bit; the split collet is arranged on the split collet seat; a retaining ring for the split collet is arranged at the front end of the split collet.

[0011] Furthermore, a water inlet B is provided in the middle of the connecting pipe A; an elastic cylindrical pin is provided on the inner wall of the outer tube where the connecting pipe A is provided; a sealing ring is provided on the outer side of the connecting pipe B; a hanging ring is provided at the connection between the connecting pipe B and the core shaft; the hanging ring is provided on the seat ring; water inlets are provided on both sides of the internal cavity of the sliding sleeve; a second adjusting nut is provided at the connection between the tail of the sliding sleeve and the core tube; a core tube upper joint is provided at the front end of the core tube; a straightening ring is provided on the outer side of the core tube; and a reamer is provided on the outer side of the tail of the outer tube.

[0012] Compared with the prior art, the utility model can achieve one of the following beneficial effects:

[0013] 1. This technology consists of seven parts: spring-loaded positioning mechanism, single-acting mechanism, double-acting valve mechanism, core full tube / blocking alarm mechanism, water-proof core protection mechanism, adjustment mechanism and core clamping mechanism. The structural features of this drilling tool are mainly reflected in the following four aspects:

[0014] (1) The spring-loaded positioning mechanism can automatically release the jam under hydraulic drive. When the inner tube reaches the bottom of the hole, the spring-loaded plate is opened outward into the spring-loaded chamber by the tension of the torsion spring, so that the inner tube cannot move back. After the drilling is completed, the hydraulic force generated by the reverse circulation of the mud causes the spring-loaded plate to be retracted inward, realizing hydraulic drive to release the jam of the inner tube.

[0015] (2) The single-acting mechanism is embedded in a closed chamber formed by the sliding sleeve and the core shaft and is in a sealed state, which can prevent erosion and corrosion by mud and increase the service life of the bearing.

[0016] (3) There is a double-acting valve mechanism inside the drill bit. When the inner tube is in place, the sealing piston is pushed by the mud fluid force, the water outlet opens, and the arrival signal is transmitted. After the drilling is completed, the sealing piston automatically returns to its original position to block the mud channel inside the drill bit to prevent the bottom hole from releasing pressure during reverse circulation and being unable to push the inner tube back up.

[0017] (4) A water-proof core protection mechanism suitable for horizontal drilling was designed. A reset spring was installed to connect the upper joint of the core tube and the stainless steel ball to prevent the stainless steel ball in the horizontal direction from leaving the working position due to gravity, causing mud to scour the core and affect the core quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the assembly structure of the utility model.

[0019] Figure 2 It is a schematic diagram of the assembly structure of the utility model.

[0020] Figure 3 This is a schematic diagram of the structure of the spring card positioning mechanism of the utility model.

[0021] Figure 4This is the structural schematic diagram of the single-acting mechanism of the present utility model.

[0022] Figure 5 This is the structural schematic diagram of the double-acting valve mechanism of the present utility model.

[0023] Figure 6 This is the structural schematic diagram of the core full-tube / clogging reporting mechanism of the present utility model.

[0024] Figure 7 This is the structural schematic diagram of the water isolation protection mechanism of the present utility model.

[0025] Description of the Drawings: 1 - fishing spearhead; 2 - rolled elastic pin; 3 - positioning pin; 4 - positioning spring; 5 - spearhead seat; 6 - inner recovery rod; 7 - upper joint; 8 - connecting pipe; 9 - outer pipe connecting pipe; 10 - spring clip plate; 11 - connecting pipe; 12 - sealing ring; 13 - suspension ring; 14 - seat ring; 15 - mandrel; 16 - sliding sleeve; 17 - cylindrical return spring; 18 - thrust ball bearing; 19 - first adjusting nut; 20 - stainless steel ball; 21 - return spring; 22 - upper joint of core barrel; 23 - core barrel; 24 - centralizer; 25 - snap ring retaining ring; 26 - snap ring; 27 - snap ring seat; 28 - drill bit; 29 - reamer; 30 - 1.5-meter outer pipe; 31 - second adjusting nut; 32 - water passage; 33 - center rod; 34 - cylindrical compression spring; 35 - water passage; 36 - sealing piston; 37 - connecting pipe; 38 - spring clip chamber; 39 - guiding elastic pin; 40 - elastic cylindrical pin; 41 - water passage; 42 - spring clip stop; 43 - torsion spring. Detailed Embodiment

[0026] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0027] Embodiment 1

[0028] A cordless core drill for pressing ultra-long horizontal holes, comprising a fishing spearhead 1, a rolled elastic pin 2, a positioning pin 3, a positioning spring 4, a spearhead seat 5, an inner recovery rod 6, an upper sub 7, a connecting pipe A 8, an outer pipe connecting pipe 9, a spring clip plate 10, a connecting pipe B 11, a sealing ring 12, a suspension ring 13, a seat ring 14, a mandrel 15, a sliding sleeve 16, a cylindrical return spring 17, a thrust ball bearing 18, a first adjusting nut 19, a stainless steel ball 20, a return spring 21, an upper joint of the core barrel 22, a core barrel 23, a centralizer 24, a retainer ring for the slip 25, a slip 26, a slip seat 27 and a drill bit 28; a fishing spearhead 1 is arranged at the front end of the drill bit 28; the fishing spearhead 1 is embedded inside the drill bit 28; the fishing spearhead 1 is arranged on the spearhead seat 5; a positioning spring 4 is arranged at the front end of the spearhead seat 5; a positioning pin 3 is arranged inside the positioning spring 4; a rolled elastic pin 2 is connected and arranged at the front end of the positioning spring 4; the rear part of the spearhead seat 5 is connected and arranged on the connecting pipe A 8; an inner recovery rod 6 for connecting the spearhead seat 5 is arranged inside the connecting pipe A 8; a spring clip plate 10 is arranged at the tail of the connecting pipe A 8; the rear part of the connecting pipe A 8 is connected and arranged with a connecting pipe B 11; the rear end of the connecting pipe B 11 is connected to the mandrel 15; the tail of the mandrel 15 is arranged inside the sliding sleeve 16; the tail of the sliding sleeve 16 is connected and arranged on the core barrel 23; the core barrel 23 is connected and arranged at the tail of the drill bit 28; the drill bit 28 is arranged inside an outer pipe 30.

[0029] Working process of the spring clip positioning mechanism: In the spring clip state during the delivery process of the inner pipe assembly, at this time, the spring clip plates 10 are not fully opened due to the restriction of the inner wall of the drill pipe, and the inner pipe continues to move downward under the driving force of the mud hydraulic pressure. When the inner pipe assembly reaches the bottom of the hole, the two spring clip plates 10 enter the spring clip chamber 38 under the tension of the torsion spring 43. When entering, the rounded triangular holes on the spring clip plates 10 drive the guide cylindrical pins 39 to move axially, and the spring clip plates 10 are fully expanded and enter the spring clip chamber 38, as shown in Figure 2 -b. At this time, the guide cylindrical pin 39 moves to the end point of the rounded triangular hole track, and the axial displacement is about 7.6 mm. Figure 2 -c shows the spring clip state during the hydraulic release of the card when the mud circulation mode is switched from the normal circulation to the reverse circulation after the end of a round of drilling. The mud pressure acts on the lower surfaces of the suspension ring, the sealing ring and the bottom end face of the inner recovery pipe mandrel. Under the pushing action of the mud hydraulic pressure, the inner recovery rod 6 moves in the direction of the hole mouth relative to the inner pipe itself, and there is a relative dislocation with the outer recovery pipe 8. Affected by the inner recovery rod 6, the guide cylindrical pin 39 slides along the rounded triangular hole track on the spring clip plate 10, forcing the spring clip plate 10 to retract inward, and the inner pipe is released and returns upward.

[0030] Embodiment 2

[0031] Based on Embodiment 1, the structure diagram of the single-acting mechanism. This mechanism consists of two thrust ball bearings 18 (A and B), a cylindrical helical spring 17, a sliding sleeve 16, a core shaft 15, and a first adjusting nut 19. The thrust ball bearings, cylindrical helical spring, bearing bush, and sliding sleeve are all nested on the core shaft and move around the core shaft. The right ring of thrust ball bearing A is in tight-fit contact with the inner wall of the sliding sleeve, and the left ring is in tight-fit contact with the cylindrical helical spring 17; the inner diameter of the thrust ball bearing is slightly larger than the outer diameter of the core shaft, so that the sliding sleeve does not rotate with the outer tube, preventing relative friction between the cylindrical helical spring 17 and the sliding sleeve during drilling. The left ring of thrust ball bearing B is in tight-fit contact with the inner wall of the sliding sleeve, and the right ring is in contact with the lock washer. The first adjusting nut is tightened to press it.

[0032] Working process of the single-acting mechanism: During drilling, under the action of the thrust ball bearing 18, the sliding sleeve does not rotate with the outer tube, keeping the lower core barrel in a relatively static state during the coring process. The cylindrical helical spring 17 and the thrust ball bearing A are located in the sealed chamber formed by the sliding sleeve 16 and the core shaft 15, effectively avoiding the scouring and corrosion of the mud and ensuring the normal operation of precision components.

[0033] Embodiment 3

[0034] Based on Embodiment 1, the double-acting valve mechanism is composed of a center rod 33, a water inlet 35, a sealing piston 36, a cylindrical compression spring 34, and a core shaft 15. The sealing piston 36 is sleeved on the center rod 33 and can slide axially along the center rod 33; the sealing piston 36 is made of rubber, and its outer diameter is slightly larger than the inner diameter of the core shaft 15, so that there is a certain radial expansion stress between the two, ensuring that the mud cannot pass through the water inlet. One end of the cylindrical compression spring 34 is in tight-fit connection with the sealing piston 36, and the other end is fixed at the internal step of the core shaft 15. Four water inlets 35 are provided on the core shaft wall, and the axial width of the water inlets 35 is 10 mm, facilitating the passage of mud through the water inlets.

[0035] Working process of the double-acting valve mechanism: During the delivery process, the inner pipe assembly moves towards the bottom of the hole under the action of the positive circulation hydraulic force of the mud. At this time, the main stressed parts of the inner pipe are the sealing ring and the internal sealing piston 36. The sealing piston 36 slides slightly along the central rod 33, and the cylindrical compression spring 34 is compressed under force. At this time, due to the movement of the inner pipe, the mud pressure is maintained within a relatively stable range value, and the mud pressure has not yet reached the threshold value for completely pushing the sealing piston to open the water passage, so the mud passage is still in a closed state. When the suspension ring 13 of the inner pipe assembly lands on the seat ring 14 of the outer pipe, the inner pipe assembly stops moving. At this time, the inner pipe reaches the designated position at the bottom of the hole, and the mud pressure continues to increase, pushing the sealing piston 36 to move. The cylindrical compression spring 34 is continuously compressed until the sealing piston 36 completely moves below the water passage, and the mud passage is completely opened. During this process, the pressure on the pump pressure gauge increases significantly, indicating that the inner pipe assembly has reached the designated position, reminding the operator that drilling can begin. When the mud stops positive circulation, the pressure on the sealing piston 36 gradually decreases, and the cylindrical compression spring 34 releases the stored elastic deformation energy, pushing the sealing piston 36 back to its initial position. At this time, the mud passage returns to the blocked state again.

[0036] Example 4

[0037] On the basis of Example 1, a core full pipe / clogging reporting mechanism; this mechanism is mainly composed of a water outlet 35, a sliding sleeve 16, a cylindrical compression spring 17, and a core shaft 15. The sliding sleeve 16 is sleeved on the outer wall of the core shaft 15, and its inner diameter is the same as the outer diameter of the outer wall of the core shaft 15, so that the sliding sleeve 16 can effectively block the water passage 35 and prevent mud from entering the closed chamber formed by the sliding sleeve 16 and the core shaft 15.

[0038] Working process of the core full pipe / clogging reporting mechanism: During the drilling process, when the core is full or clogged, the core generates an upward pushing force on the inner pipe. The top of the core pipe pushes the sliding sleeve 16 to move upward, forcing the cylindrical compression spring 17 to be compressed. The compression spring 17 stores elastic deformation energy. As the deformation amount of the upward pushing force gradually increases, the sliding sleeve 16 continues to move under force until it blocks the water passage 35, the mud passage is blocked, and the pump pressure in the hole increases. At this time, the operator can stop drilling according to the change in the value of the pressure gauge and prepare to recover the inner pipe assembly. According to the different hardness of the drilling formation, sliding sleeves of different lengths or compression springs of different specifications can be replaced, so that it does not affect drilling and can accurately report when the core is full or clogged.

[0039] Example 5

[0040] Based on Embodiment 1, the structure of the water - isolating core - protecting mechanism; this mechanism is mainly composed of a water - passing port 32, a stainless - steel ball 20, a return spring 21, an upper joint of the core barrel 22, and a second adjusting nut 31. The upper joint of the core barrel 22 is thread - connected to both the inner tube and the core barrel. A stainless - steel ball with a diameter of 14 mm is placed on the top of the upper joint of the core barrel to form a structure similar to a check valve. Since the direction of gravity is perpendicular to the direction of the horizontal hole, a return spring 21 is installed at the bottom of the stainless - steel ball 20 and embedded at the inner step of the channel to prevent the stainless - steel ball 20 from detaching from the top of the upper joint of the core barrel 22 due to the action of gravity.

[0041] The working process of the water - isolating core - protecting mechanism: During drilling, the flushing fluid inside the core barrel is squeezed by the core, causing the mud pressure in the core barrel to increase, and pushing the stainless - steel ball 20 open to flow out from the side of the water - passing port. After the mud flows out of the core barrel and the pressure is relieved, the stainless - steel ball 20 returns to its original position under the action of the return spring 21. During normal drilling and the process of hydraulically driving and recovering the inner - tube assembly, the stainless - steel ball 20 fits tightly with the top of the upper joint of the core barrel 22, which can effectively prevent mud from entering the core barrel and scouring the core.

[0042] Although the present invention has been described herein with reference to multiple illustrative embodiments of the present invention, it should be understood that those skilled in the art can design many other modifications and embodiments that will fall within the scope of the principles and spirit disclosed in this application. More specifically, within the scope of this application's disclosure, the drawings, and the claims, various variations and improvements can be made to the components and / or layout of the subject combination layout. In addition to the variations and improvements made to the components and / or layout, other uses will also be apparent to those skilled in the art.

Claims

1. A cordless core drill for pressing ultra-long horizontal holes, characterized in that: It includes a spear tip (1), a coiled spring pin (2), a positioning pin (3), a positioning spring (4), a spear tip seat (5), an inner recovery rod (6), an upper joint (7), a connecting pipe A (8), an outer pipe connecting pipe (9), a spring clip plate (10), a connecting pipe B (11), a sealing ring (12), a suspension ring (13), a seat ring (14), a mandrel (15), a sliding sleeve (16), a cylindrical return spring (17), a thrust ball bearing (18), a first adjusting nut (19), a stainless steel ball (20), a return spring (21), an upper joint of the core barrel (22), a core barrel (23), a centralizing ring (24), a retaining ring for the split ring (25), a split ring (26), a split ring seat (27) and a drill bit (28); a spear tip (1) is provided at the front end of the drill bit (28); the spear tip (1) is embedded inside the drill bit (28); the spear tip (1) is arranged on the spear tip seat (5); a positioning spring (4) is provided at the front end of the spear tip seat (5); a positioning pin (3) is arranged inside the positioning spring (4); a coiled spring pin (2) is connected and arranged at the front end of the positioning spring (4); the rear part of the spear tip seat (5) is connected and arranged on the connecting pipe A (8); an inner recovery rod (6) is arranged inside the connecting pipe A (8) to connect the spear tip seat (5); a spring clip plate (10) is arranged at the tail of the connecting pipe A (8); the rear part of the connecting pipe A (8) is connected and arranged with a connecting pipe B (11); the rear end of the connecting pipe B (11) is connected to the mandrel (15); the tail of the mandrel (15) is arranged inside the sliding sleeve (16); the tail of the sliding sleeve (16) is connected and arranged on the core barrel (23); the core barrel (23) is connected and arranged at the tail of the drill bit (28); the drill bit (28) is arranged inside the outer pipe (30).

2. The cordless core drill for pressing extra-long horizontal holes according to claim 1, characterized in that: Two spring clip plates (10) are symmetrically arranged; the front end of the spring clip plate (10) is on the elastic cylindrical pin (40); a torsion spring (43) is arranged on the elastic cylindrical pin (40); the rear sides of the two spring clip plates (10) are clamped and arranged inside the spring clip chamber (38); the spring clip chamber (38) is arranged on the inner wall of the outer pipe connecting pipe (9); a guiding elastic pin (39) is arranged in the middle of the spring clip plate (10).

3. A cordless core drill for pressing ultra-long horizontal holes according to claim 1, characterized in that: A cylindrical compression spring (34) is arranged at the tail of the connecting pipe B (11) to connect the mandrel (15); a sealing piston (36) is arranged at the front end of the cylindrical compression spring (34); a water passage A (35) is arranged on the side of the sealing piston (36).

4. A cordless core drill for pressing extra-long horizontal holes according to claim 1, characterized in that: A cylindrical return spring (17) is arranged at the tail of the mandrel (15); the cylindrical return spring (17) is sleeved on the central rod (33); the tail of the central rod (33) is fixedly arranged on the sliding sleeve (16) through the first adjusting nut (19); a thrust ball bearing (18) is arranged between the cylindrical return spring (17) and the first adjusting nut (19).

5. A cordless core drill for pressing ultra-long horizontal holes according to claim 1, characterized in that: At the connection between the sliding sleeve (16) and the core barrel (23); a stainless steel ball (20) is arranged at the front end of the core barrel (23); the stainless steel ball (20) is connected and arranged at the front end of the core barrel (23) through a return spring (21); a cavity is arranged at the rear part of the sliding sleeve (16); the stainless steel ball (20) is arranged inside the cavity.

6. A cordless coring drill for pressing extra-long horizontal holes according to claim 1, characterized in that: A retaining spring (26) is arranged at the connection between the bottom of the core barrel (23) and the drill bit (28); the retaining spring (26) is arranged on a retaining spring seat (27); a retaining spring snap ring (25) is arranged at the front end of the retaining spring (26).

7. A cordless core drill for pressing extra-long horizontal holes according to claim 1, characterized in that: A water passing port B (41) is arranged in the middle of the connecting pipe A (8); an elastic cylindrical pin (40) is arranged on the inner wall of the outer pipe (30) at the position where the connecting pipe A (8) is arranged; a sealing ring (12) is arranged on the outside of the connecting pipe B (11); a suspension ring (13) is arranged at the connection between the connecting pipe B (11) and the core shaft (15); the suspension ring (13) is arranged on a seat ring (14); water passing ports (32) are arranged on both sides of the inner cavity of the sliding sleeve (16); a second adjusting nut (31) is arranged at the connection between the tail of the sliding sleeve (16) and the core barrel (23); an upper joint of the core barrel (22) is arranged at the front end of the core barrel (23); a centralizer ring (24) is arranged on the outside of the core barrel (23); a reamer (29) is arranged on the outside of the tail of the outer pipe (30).

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