A multi-mode sampling drilling device based on lithology-adjusted drill bit mounting seat and a hole-forming method

Abstract

The application discloses a multi-mode sampling drilling device based on a lithology-adjusted drill bit mounting seat and a hole-forming method, and belongs to the technical field of drilling devices.

Description

Technical Field

[0001] This invention relates to the field of drilling equipment technology, and more specifically, to a multi-mode sampling drilling device and drilling method based on a lithology-adjusting drill bit mounting base. Background Technology

[0002] In various rock-related engineering operations and research, from geological exploration and mining to building foundation construction, drilling and sampling rocks is a crucial step in obtaining information about rock characteristics and ensuring the smooth progress of projects. However, currently available rock drilling equipment suffers from numerous insurmountable problems, severely restricting work efficiency and the accuracy of hole formation.

[0003] Most traditional rock drilling equipment has a relatively simple design, employing only one fixed drilling and sampling method. In actual rock drilling scenarios, rock types are diverse, with vastly different characteristics. For example, hard rocks such as dolomite and conglomerate have high hardness and dense structures, making it difficult to penetrate and obtain samples using ordinary drilling methods. While relatively soft rocks such as shale and limestone are easier to drill, improper sampling methods can easily damage the integrity of the samples, affecting subsequent testing and analysis. Traditional equipment cannot flexibly adjust the drilling and sampling method according to different rock characteristics, often leading to difficulties when facing complex and varied rock formations. This often necessitates interrupting operations, replacing equipment, or adopting other remedial measures, which undoubtedly significantly reduces work efficiency and increases time and economic costs.

[0004] Furthermore, traditional drilling equipment lacks flexibility in drill bit configuration. Different rock materials have drastically different requirements for drill bits; hard rocks require drill bits with high hardness and wear resistance, while softer rocks require drill bits that can ensure sample integrity. However, existing devices are often equipped with fixed types of drill bits, making it impossible to change to suitable drill bits in a timely manner according to rock characteristics. This not only leads to low drilling efficiency and excessive wear or even damage to the drill bits, but may also cause unnecessary damage to the rock sample during drilling due to drill bit incompatibility, affecting sample quality and thus interfering with the accurate determination of the true characteristics of the rock.

[0005] Moreover, traditional rock drilling equipment lacks effective strategies for dealing with complex rock formations. For example, rock formations may contain uneven hardness, interlayers, etc. A single drilling method and drill bit are difficult to adapt to such complex changes, which can easily lead to problems such as borehole deviation and irregular hole diameter, affecting the quality of engineering construction and the reliability of research results.

[0006] In summary, existing rock drilling equipment suffers from serious deficiencies in terms of the flexibility of drilling and sampling methods, the adaptability of drill bit configurations, the ability to handle complex rock formations, and ease of operation. Developing a new type of drilling equipment that can flexibly select drilling and sampling methods based on different rock formation conditions and can quickly change to appropriate drill bits for different rock materials is urgently needed. This is of vital importance for improving the efficiency and quality of rock-related work and promoting technological development in the field of rock engineering. Summary of the Invention

[0007] The purpose of this invention is to provide a multi-mode sampling drilling device and hole-forming method based on a lithology-adjusting drill bit mounting base, so as to solve the problems mentioned in the background art.

[0008] A multi-mode sampling drilling device and drilling method based on a lithology-adjusting drill bit mounting base includes a mounting plate, a fixing plate fixedly mounted on the side of the mounting plate, a balance column fixedly mounted on the upper end of the fixing plate, a motor support cylinder fixedly mounted on the front side of the balance column, the motor support cylinder and the balance column being fixedly connected by a connecting column, a turbine motor being provided on the upper side of the motor support cylinder, a drive rod being fixedly mounted on the lower output end of the turbine motor, and a driven drill rod being fixedly mounted on the lower output end of the drive rod by a thread.

[0009] A balance frame is fixedly installed on the side of the fixed plate. A sampling drill bit is fixedly installed at the lower end of the driven drill rod. An inner guide cylinder is fixedly installed in the middle of the sampling drill bit. A drilling connecting rod is slidably arranged in the middle of the inner guide cylinder. A second fixing hole is opened on the upper side of the sampling drill bit. A first fixing hole is opened in the middle of the driven drill rod. A drill bit mounting seat is fixedly installed at the lower end of the drilling connecting rod. Four drill bit mounting slots are opened at the lower end of the drill bit mounting seat.

[0010] Furthermore, a stabilizing plate is fixedly installed on the upper center of the mounting plate, and a counterweight is fixedly installed on the side of the connecting column. The counterweight is a metal part of different weight that is clamped together.

[0011] By adopting the above technical solution, when drilling is required, the counterweight can be used to balance the device, thereby stabilizing the center of gravity and reducing swaying.

[0012] Furthermore, bolts are provided at the four corners of the fixing plate and the mounting plate, and a stabilizing element is provided in the middle of the balance column.

[0013] By adopting the above technical solution, bolts can be used to fix the mounting plate, and the stabilizing component can limit and protect the driven drill rod, reducing vibration transmission during the drilling process.

[0014] Furthermore, a guide plate is fixedly installed on the lower side of the turbine motor, four limiting guide rods are arranged in a ring in the middle of the motor support cylinder, circular through grooves corresponding to the limiting guide rods are opened at the four corners of the side of the guide plate, and metal buckles are provided on both sides of the guide plate.

[0015] By adopting the above technical solution, the turbine motor can drive the lower drive rod to rotate, thereby enabling drilling and rock sampling operations. The limiting guide rod can ensure that the turbine motor can descend smoothly, increasing the accuracy of drilling. Operators can set steel cables on the metal buckles on both sides of the guide plate and pull them down to lower the turbine motor.

[0016] Furthermore, a fixing component is fixedly installed at the lower end of the turbine motor, a limiting plate is fixedly installed at the lower end of the fixing component, and a reinforcing sleeve is fixedly installed at the upper middle part of the motor support cylinder.

[0017] By adopting the above technical solution, the fixing component and the limiting plate can protect the drive rod in the middle during the downward movement of the turbine motor, thereby increasing the stability of the hole formation.

[0018] Furthermore, a fixing pin is provided in the middle of the second fixing hole, and the fixing pin has the same hole diameter as the first fixing hole. A cross-shaped through hole corresponding to the fixing pin and the first fixing hole is opened on the upper side of the drilling connecting rod. A stabilizing ring is fixedly installed on the top of the inner cavity of the sampling drill bit.

[0019] By adopting the above technical solution, the drilling connecting rod can be limited and fixed through the first fixing hole and the second fixing hole, thereby completing the construction according to different requirements.

[0020] Furthermore, a safety insertion post is threaded on the lower side of the motor support cylinder, a handle is fixedly installed on the upper side of the connecting column, and a hanging lug is fixedly installed on the rear side of the connecting column.

[0021] By adopting the above technical solution, the drive rod in the middle can be fixed by tightening the safety insertion stake. When the device is transported, the drive rod can be fixed and limited by the safety insertion stake.

[0022] Furthermore, the side of the balance frame is provided with a pile extraction groove, the lower end of the balance frame is provided with four overflow grooves in a ring, and the upper side of the sampling drill bit is provided with a water injection groove.

[0023] By adopting the above technical solution, water pipes connected to the water injection tank can inject clean water during the drilling process on the lower side, which cools the drilling location and reduces dust generation. The overflow tank can facilitate the overflow of water mixed with mortar, avoiding blockage in the hole.

[0024] Furthermore, it includes the following steps:

[0025] Step 1: Set the device in a suitable position according to the drilling location, select an appropriate counterweight according to the rock hardness, and fix the mounting plate and fixing plate with bolts.

[0026] Step 2: Adjust the output power of the turbine motor according to the rock hardness, check whether the connection between the drive rod and the driven drill rod is tight, and whether the sliding cooperation between the limit guide rod and the guide plate is smooth.

[0027] Step 3: When drilling and sampling harder materials, it is more difficult to sample shaped stones. Adjust the drill bit mounting base to match the height of the bottom of the sampling drill bit and fix it. If it is necessary to sample crushed samples, set a spiral diamond drill bit in the drill bit mounting slot to crush and excavate the stone. When it is necessary to sample fragmented rock, there is no need to set a drill bit in the drill bit mounting slot to crush and sample the stone.

[0028] Step 4: When drilling to sample softer rock blocks, adjust the drill bit mounting base to the top position of the sampling drill bit and directly drill through the sampling drill bit to obtain samples.

[0029] Compared with the prior art, the advantages of this invention are:

[0030] 1. In this invention, by setting a structure with a motor support cylinder, the device is more stable during the hole-forming process, resulting in higher accuracy in hole-forming and sampling. Hole-forming and sampling can be completed by a single person, making it more user-friendly.

[0031] 2. In this invention, by setting a structure with a sampling drill bit, different sampling schemes can be used according to different rock strata materials. For hard rock strata, fragmented sampling can be performed, and for softer rock strata, whole sampling can be performed, thereby meeting different usage scenarios.

[0032] 3. In this invention, by providing a structure with a drill bit mounting base, different drill bits can be set according to the rock hardness, thereby meeting different sampling requirements such as powder sampling and rock block sampling. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0034] Figure 2 This is a schematic diagram of two structural parts of the overall structure of the present invention;

[0035] Figure 3 This is a cross-sectional view of the overall structure of the present invention;

[0036] Figure 4 For the present invention Figure 3 Schematic diagram of the structure at point A in the diagram;

[0037] Figure 5 For the present invention Figure 3 Schematic diagram of the structure at point B in the diagram;

[0038] Figure 6 This is a schematic diagram of the drill bit mounting base of the present invention;

[0039] Figure 7 This is a schematic diagram of the sampling drill bit in its retracted state according to the present invention.

[0040] The following are the labels in the diagram: 1. Guide plate; 2. Limiting guide rod; 3. Fixing component; 4. Limiting plate; 5. Motor support cylinder; 501. Reinforcing sleeve; 6. Safety insertion pile; 7. Stabilizing component; 8. Driven drill rod; 801. First fixing hole; 9. Balance frame; 901. Overflow trough; 902. Pile extraction groove; 10. Sampling drill bit; 1001. Fixing pin; 1002. Second fixing hole; 11. Turbine motor; 12. Handle; 13. Counterweight; 14. Stabilizing plate; 15. Connecting column; 16. Mounting plate; 1601. Fixing plate; 17. Balance column; 18. Hanging lug; 19. Drive rod; 20. Drilling connecting rod; 21. Drill bit mounting seat; 2101. Drill bit mounting groove; 22. Stabilizing ring; 23. Inner guide cylinder. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] like Figure 1 - Figure 7 As shown, the embodiment of the present invention provides: including a mounting plate 16, a fixing plate 1601 fixedly mounted on the side of the mounting plate 16, a balance column 17 fixedly mounted on the upper end of the fixing plate 1601, a motor support cylinder 5 fixedly mounted on the front side of the balance column 17, the motor support cylinder 5 and the balance column 17 being fixedly connected by a connecting column 15, a turbine motor 11 being provided on the upper side of the motor support cylinder 5, a drive rod 19 being fixedly mounted on the lower output end of the turbine motor 11, and a driven drill rod 8 being fixedly mounted on the lower output end of the drive rod 19 by a thread;

[0043] A balance frame 9 is fixedly installed on the side of the fixed plate 1601. A sampling drill bit 10 is fixedly installed at the lower end of the driven drill rod 8. An inner guide cylinder 23 is fixedly installed in the middle of the sampling drill bit 10. A drilling connecting rod 20 is slidably arranged in the middle of the inner guide cylinder 23. A second fixing hole 1002 is opened on the upper side of the sampling drill bit 10. A first fixing hole 801 is opened in the middle of the driven drill rod 8. A drill bit mounting seat 21 is fixedly installed at the lower end of the drilling connecting rod 20. Four drill bit mounting slots 2101 are opened at the lower end of the drill bit mounting seat 21.

[0044] A stabilizing plate 14 is fixedly installed on the upper middle part of the mounting plate 16, and a counterweight 13 is fixedly installed on the side of the connecting column 15. The counterweight 13 is a metal part of different weight that is clamped and set. When drilling is required, the counterweight 13 can be used to counterweight the device, so that the center of gravity of the device is stable and the shaking is reduced.

[0045] Bolts are provided at the four corners of the fixing plate 1601 and the mounting plate 16. A stabilizer 7 is provided in the middle of the balance column 17. The mounting plate 16 can be fixed with bolts. The stabilizer 7 can limit and protect the driven drill rod 8, reducing the transmission of vibration during the hole forming process.

[0046] A guide plate 1 is fixedly installed on the lower side of the turbine motor 11. Four limiting guide rods 2 are arranged in a ring in the middle of the motor support cylinder 5. Circular through slots corresponding to the limiting guide rods 2 are opened at the four corners of the side of the guide plate 1. Metal buckles are provided on both sides of the guide plate 1. The turbine motor 11 can drive the drive rod 19 on the lower side to rotate, thereby enabling drilling and rock sampling operations. The limiting guide rods 2 can ensure that the turbine motor 11 can descend smoothly, increasing the accuracy of drilling. The operator can set steel cables on the metal buckles on both sides of the guide plate 1 and pull them down to lower the turbine motor 11.

[0047] A fixing part 3 is fixedly installed at the lower end of the turbine motor 11, and a limiting plate 4 is fixedly installed at the lower end of the fixing part 3. A reinforcing sleeve 501 is fixedly installed in the middle of the upper side of the motor support cylinder 5. When the turbine motor 11 moves downward, the fixing part 3 and the limiting plate 4 can protect the drive rod 19 in the middle and increase the stability of the hole.

[0048] A fixing pin 1001 is provided in the middle of the second fixing hole 1002. The fixing pin 1001 and the first fixing hole 801 have the same hole diameter. A cross-shaped through hole corresponding to the fixing pin 1001 and the first fixing hole 801 is opened on the upper side of the drilling connecting rod 20. A stabilizing ring 22 is fixedly installed on the top of the inner cavity of the sampling drill bit 10. The drilling connecting rod 20 can be limited and fixed through the first fixing hole 801 and the second fixing hole 1002, thereby completing the construction of different requirements.

[0049] The lower end of the motor support cylinder 5 is threaded with a safety insertion pin 6. A handle 12 is fixedly installed on the upper side of the connecting column 15, and a hanging ear 18 is fixedly installed on the rear side of the connecting column 15. The drive rod 19 in the middle can be fixed by tightening the safety insertion pin 6. When the device is transported, the drive rod 19 can be fixed and limited by the safety insertion pin 6.

[0050] The side of the balance frame 9 is provided with a pile extraction groove 902, and the lower end of the balance frame 9 is provided with four overflow grooves 901 in a ring. The upper side of the sampling drill bit 10 is provided with a water injection groove. A water pipe is connected to the water injection groove to inject clean water during the drilling process on the lower side, which cools the drilling position and reduces dust generation. The overflow groove 901 can facilitate the overflow of water mixed with mortar, avoiding blockage in the hole.

[0051] The specific implementation includes the following steps:

[0052] Step 1: Set the device in a suitable position according to the drilling location, select a suitable counterweight 13 according to the rock hardness, and fix the mounting plate 16 and the fixing plate 1601 with bolts.

[0053] Step 2: Adjust the output power of the turbine motor 11 according to the rock hardness, check whether the connection between the drive rod 19 and the driven drill rod 8 is tight, and check whether the sliding cooperation between the limit guide rod 2 and the guide plate 1 is smooth.

[0054] Step 3: When drilling and sampling harder materials, it is difficult to sample shaped stones. Adjust the drill bit mounting base 21 to match the bottom height of the sampling drill bit 10 and fix it. If it is necessary to sample crushed samples, a spiral diamond drill bit can be set in the drill bit mounting slot 2101 to crush and excavate the stones. When it is necessary to sample fragmented rock samples, there is no need to set a drill bit in the drill bit mounting slot 2101 position to crush and sample the stones.

[0055] Step 4: When drilling to sample softer rock blocks, adjust the drill bit mounting base 21 to the top position of the sampling drill bit 10, and directly drill through the sampling drill bit 10 to collect samples.

[0056] The working principle of this invention is as follows: The operator first selects a drive rod 19 of appropriate length according to the depth of the hole. The top of the drive rod 19 is fixedly connected to the lower output end of the turbine motor 11, and the lower end of the drive rod 19 is fixedly connected to the upper end of the driven drill rod 8. The operator fixes the mounting plate 16 and the fixing plate 1601 to the working surface with four corner bolts. According to the rock hardness, a counterweight 13 of appropriate weight is selected and clamped on the side of the connecting column 15. After the device is installed stably, metal buckles are provided on both sides of the guide plate 1. The operator can set steel cables on the metal buckles on both sides of the guide plate 1, start the turbine motor 11, and pull the steel cables down to make the turbine motor 11 descend. Since four limit guide rods 2 are arranged in a ring in the middle of the motor support cylinder 5, and circular through slots corresponding to the limit guide rods 2 are opened at the four corners of the side of the guide plate 1, the limit guide rods 2 can ensure that the turbine motor 11 can descend smoothly.

[0057] Example 1: When encountering relatively hard rocks such as tuff, it is difficult to sample and form a rock block. The operator can align the drill bit mounting seat 21 on the lower side of the drilling rod 20 with the bottom of the sampling drill bit 10 in advance, and use the fixing pin 1001 to fix the drilling rod 20 at the second fixing hole 1002. A spiral diamond drill bit is set in the drill bit mounting groove 2101. During the rotation of the drilling rod 20, it will have a greater crushing effect on the rock. After the hole is completed, a hydraulic pile pulling device is set at the pile pulling groove 902 to lift the sampling drill bit 10 upward as a whole, so as to obtain a crushed rock sample.

[0058] In Example 2, when encountering relatively hard rock formations such as dolomite or conglomerate, the difficulty of sampling and forming rock blocks is moderate, but it is still difficult to collect a sample. Only crushed rock samples can be collected. The operator can align the drill bit mounting seat 21 on the lower side of the drilling rod 20 with the bottom of the sampling drill bit 10 in advance, and use the fixing pin 1001 to fix the drilling rod 20 at the second fixing hole 1002. There is no need to set the drill bit at the drill bit mounting slot 2101 position. The hole structure of the drill bit mounting slot 2101 on the lower side of the drill bit mounting seat 21 can crush the rock to a certain extent. The rock is crushed into blocks. After the hole is completed, a hydraulic pile extraction device is set at the pile extraction slot 902 position to lift the sampling drill bit 10 upward as a whole, thereby obtaining the crushed rock sample.

[0059] In Example 3, when sampling softer rocks such as shale and limestone, which are easy to drill, brittle, and easy to collect, the drilling rod 20 can be raised to the top of the inner guide cylinder 23, and the drill bit mounting base 21 can be fixed by the fixing pin 1001 passing through the first fixing hole 801. At this time, as the sampling drill bit 10 rotates downward, a barrel-shaped rock sample can be collected. When the drill bit mounting base 21 and the sampling drill bit 10 rotate downward synchronously and squeeze, the rock at the top of the sampling drill bit 10 will be squeezed and engaged with the drill bit mounting base 21. After the hole is formed, the rock sample on the upper side of the sampling drill bit 10 located at the drill bit mounting base 21 has a large pressure. After the hole is formed, when the sampling drill bit 10 is lifted upward by the hydraulic pile extraction equipment, the internal rock sample is easily lifted up, which is convenient for subsequent collection.

[0060] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A multi-mode sampling borehole device based on a lithology-adjusting drill bit mounting base, comprising a mounting plate (16), characterized in that: A fixing plate (1601) is fixedly installed on the side of the mounting plate (16). A balance column (17) is fixedly installed on the upper end of the fixing plate (1601). A motor support cylinder (5) is fixedly installed on the front side of the balance column (17). The motor support cylinder (5) and the balance column (17) are fixedly connected by a connecting column (15). A turbine motor (11) is provided on the upper side of the motor support cylinder (5). A drive rod (19) is fixedly installed on the lower output end of the turbine motor (11). A driven drill rod (8) is fixedly installed on the lower output end of the drive rod (19) by thread. A balance frame (9) is fixedly installed on the side of the fixed plate (1601). A sampling drill bit (10) is fixedly installed at the lower end of the driven drill rod (8). An inner guide cylinder (23) is fixedly installed in the middle of the sampling drill bit (10). A drilling connecting rod (20) is slidably arranged in the middle of the inner guide cylinder (23). A second fixing hole (1002) is opened on the upper side of the sampling drill bit (10). A first fixing hole (801) is opened in the middle of the driven drill rod (8). A drill bit mounting seat (21) is fixedly installed at the lower end of the drilling connecting rod (20). Four drill bit mounting slots (2101) are opened at the lower end of the drill bit mounting seat (21). A fixing pin (1001) is provided in the middle of the second fixing hole (1002). The fixing pin (1001) and the first fixing hole (801) have the same hole diameter. A cross-shaped through hole corresponding to the fixing pin (1001) and the first fixing hole (801) is opened on the upper side of the drilling connecting rod (20). A stabilizing ring (22) is fixedly installed on the top of the inner cavity of the sampling drill bit (10).

2. A multi-mode sampling borehole device based on lithology adjusted bit mount according to claim 1, characterized in that: A stabilizing plate (14) is fixedly installed on the upper middle part of the mounting plate (16), and a counterweight (13) is fixedly installed on the side of the connecting column (15). The counterweight (13) is a metal part of different weight that is clamped and set.

3. A multi-mode sampling drill apparatus based on lithology adjusted bit mount according to claim 2, wherein: Bolts are provided at the four corners of the fixing plate (1601) and the mounting plate (16), and a stabilizing element (7) is provided in the middle of the balance column (17).

4. A multi-mode sampling borehole device based on lithology adjusted bit mount according to claim 3, characterized in that: A guide plate (1) is fixedly installed on the lower side of the turbine motor (11). Four limiting guide rods (2) are arranged in a ring in the middle of the motor support cylinder (5). Circular through grooves corresponding to the limiting guide rods (2) are opened at the four corners of the side of the guide plate (1). Metal buckles are provided on both sides of the guide plate (1).

5. A multi-mode sampling borehole device based on a lithology-adjusting drill bit mounting base according to claim 4, characterized in that: The lower end of the turbine motor (11) is fixedly installed with a fastener (3), the lower end of the fastener (3) is fixedly installed with a limit plate (4), and the upper middle part of the motor support cylinder (5) is fixedly installed with a reinforcing sleeve (501).

6. A multi-mode sampling borehole device based on lithology adjusted bit mount according to claim 5, characterized in that: The lower end of the motor support cylinder (5) is threaded with a safety insertion post (6), the upper side of the connecting column (15) is fixedly installed with a handle (12), and the rear side of the connecting column (15) is fixedly installed with a hanging ear (18).

7. A multi-mode sampling drill apparatus based on lithology adjusted bit mount according to claim 6, wherein: The side of the balance frame (9) is provided with a pile extraction groove (902), and the lower end of the balance frame (9) is provided with four overflow grooves (901) in a ring. The upper side of the sampling drill bit (10) is provided with a water injection groove.

8. A multi-mode drilling method based on a lithology-adjusting drill bit mounting base, relating to the multi-mode sampling drilling device based on a lithology-adjusting drill bit mounting base as described in claim 4, characterized in that... Includes the following steps: Step 1: Set the device in a suitable position according to the drilling location, and select a suitable counterweight (13) according to the rock hardness. At the same time, use bolts to fix the mounting plate (16) and the fixing plate (1601). Step 2: Adjust the output power of the turbine motor (11) according to the rock hardness, check whether the connection between the drive rod (19) and the driven drill rod (8) is tight, and check whether the sliding cooperation between the limit guide rod (2) and the guide plate (1) is smooth. Step 3 When drilling and sampling hard materials, it is difficult to sample shaped stones. Adjust the drill bit mounting base (21) to match the bottom height of the sampling drill bit (10) and fix it. If it is necessary to sample crushed samples, set a spiral diamond drill bit in the drill bit mounting slot (2101) to crush and excavate the stones. When it is necessary to sample fragmented rock samples, there is no need to set a drill bit in the drill bit mounting slot (2101) to crush and sample the stones. Step 4: When drilling to sample softer rock blocks, adjust the drill bit mounting base (21) to the top position of the sampling drill bit (10) and directly drill through the sampling drill bit (10) to collect samples.

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