Drilling device for frozen soil monitoring

Abstract

The utility model relates to the technical field of frozen soil monitoring, and discloses a drilling device for frozen soil monitoring, which comprises a low-temperature drill bit internally provided with a cooling channel used for filling cooling gas or liquid; the lifting assembly is coaxially and rotationally connected with the upper end of the low-temperature drill bit; the drill barrel sleeves the peripheral sides of the low-temperature drill bit and the lifting assembly; the power assembly is used for driving the low-temperature drill bit to rotate. The cooling channel is filled with cooling gas or liquid, so that the temperature in the drilling process of the low-temperature drill bit can be reduced, frozen soil is effectively prevented from being melted, the quality of samples is improved, and the accuracy of data is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of frozen soil monitoring, in particular to a drilling device for frozen soil monitoring. Background Art

[0002] Frozen soil refers to various rocks and soils below zero degrees Celsius and containing ice. It is very important to obtain accurate information about frozen soil when conducting geological exploration, construction or other engineering activities in frozen areas.

[0003] The patent with the announcement number CN219672578U discloses a permafrost monitoring drilling device, which uses a sawtooth cutter at the lower end of the soil sampling tube to break the hard frozen soil, and the spiral cutting blade rotates to drill into the frozen soil, so that the soil sampling tube quickly penetrates into the frozen soil, which is convenient for sampling deep frozen soil. When the soil sampling tube rotates downward, the annular sawtooth cutter cuts the bottom frozen soil in an annular manner, so that the frozen soil fills into the soil sampling tube, and the frozen soil sample is taken out. However, the friction heat during the drilling process causes the surrounding frozen soil to melt, thereby affecting the representativeness of the sample and the accuracy of the data.

[0004] Therefore, a special drilling device is needed that is efficient, accurate and can minimize disturbance to the frozen soil. Utility Model Content

[0005] The utility model aims to provide a drilling device for frozen soil monitoring to overcome the above-mentioned shortcomings.

[0006] In order to achieve the above purpose, the technical solution of the utility model is:

[0007] A drilling device for frozen soil monitoring, comprising:

[0008] A cryogenic drill bit having a cooling channel therein, wherein the cooling channel is used to be filled with cooling gas or liquid;

[0009] A lifting assembly coaxially rotatably connected to the upper end of the cryogenic drill bit;

[0010] a drill barrel sleeved around the cryogenic drill bit and the lifting assembly; and

[0011] A power assembly for driving the cryogenic drill to rotate.

[0012] Furthermore, the low-temperature drill bit includes a joint and a drill bit body, the upper end of the joint is coaxially rotatably connected to the lifting assembly and is provided with the cooling channel, the joint is fixedly connected to the drill bit body, the lower end of the drill bit body is protrudingly provided with a ball tooth, and the joint and / or the drill bit body are provided with heat dissipation holes connected to the cooling channel.

[0013] Furthermore, the heat dissipation hole includes at least one of the following structures:

[0014] Structure 1: The joint is provided with a plurality of radially arranged first heat dissipation holes, and the first heat dissipation holes are connected to the cooling channel;

[0015] Structure 2: The drill body is provided with a plurality of axially arranged second heat dissipation holes, and the second heat dissipation holes are connected to the cooling channel.

[0016] Furthermore, the lifting assembly includes a rotating shaft with a hollow structure and a spiral blade fixedly connected to the outer wall of the upper section of the rotating shaft, a cooling channel is arranged in the rotating shaft, and the lower end of the rotating shaft is slidingly connected to the joint in a radial direction, and the cooling channel of the rotating shaft is connected to the cooling channel of the joint.

[0017] Furthermore, it also includes: a connecting sleeve fixedly connected to the inside of the drill pipe, wherein a sliding head is fixedly installed in the radial direction of the connecting sleeve;

[0018] The joint comprises a driving section, a sliding section and a connecting part which are in a hollow structure and are fixedly connected in sequence from top to bottom, the driving section is located inside the connecting sleeve and an outer wall is surrounded by a first sliding groove in a closed wave shape, the sliding head is slidably connected to the first sliding groove, the sliding section is slidably connected to the connecting sleeve, the cooling channel is provided in the sliding section and the connecting part, the connecting part is provided with a first heat dissipation hole, and the connecting part is fixedly connected to the drill body;

[0019] The lower end of the rotating shaft is slidably connected with the driving section and the sliding section.

[0020] Furthermore, a second slide groove is axially arranged on the inner side wall of the driving section, a slider is fixedly connected to the outer side wall of the lower end of the rotating shaft, the slider is slidably connected to the second slide groove, and a first sealing ring is installed on the rotating shaft arranged opposite to the sliding section, and the first sealing ring is interference fit with the cooling channel of the sliding section.

[0021] Further, a ring-shaped support plate and a closing plate are fixedly connected to the inner side wall of the upper section of the drill tube, the support plate is located on the upper side of the closing plate, the rotating shaft is rotatably connected to the support plate through a bearing, and a second sealing ring is installed on the circumferential side of the rotating shaft opposite to the closing plate, and the second sealing ring is interference-fitted with the inner side wall of the closing plate;

[0022] The outer side wall of the upper end of the drill tube is fixedly connected with a collecting pipe, the collecting pipe is communicated with the drill tube, and the collecting pipe is located below the closing plate.

[0023] Furthermore, the power assembly comprises:

[0024] a housing fixedly connected to the drill pipe, wherein the upper end of the rotating shaft is located inside the housing; and

[0025] A driving motor is fixedly connected to the housing, and the driving motor is transmission-connected to the upper end of the rotating shaft via a reduction gear set.

[0026] Furthermore, a rotary joint is installed at the upper end of the rotating shaft, and a cooling pipe is connected to the rotary joint. The cooling pipe is connected to the cooling channel through the rotary joint, and the cooling pipe is arranged through the shell.

[0027] Furthermore, the reduction gear set comprises:

[0028] A driving gear is keyed to the output shaft of the driving motor, and

[0029] The upper end of the rotating shaft passes through the supporting plate and is key-connected to a driven gear, the driven gear is located in the housing and is transmission-connected to the driving gear;

[0030] The housing is provided with a handle.

[0031] Compared with the prior art, the utility model has at least the following advantages:

[0032] The utility model utilizes cooling gas or liquid to be filled in the cooling channel, which can reduce the temperature during the drilling process of the low-temperature drill, effectively avoid the melting of frozen soil, improve the quality of samples, and improve the accuracy of data. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0034] Figure 1 This is a schematic diagram of the overall structure of the drilling device for frozen soil monitoring of the utility model;

[0035] Figure 2 It is a cross-sectional view of the drilling device for frozen soil monitoring of the utility model;

[0036] Figure 3 It is a schematic diagram of the assembly of the joint, the drill bit body and the ball pool of the utility model;

[0037] Figure 4 It is a cross-sectional view of the rotating shaft, joint, drill body and ball pool of the utility model;

[0038] Figure 5 Another cross-sectional view of the rotating shaft, joint, drill body and ball pool of the utility model;

[0039] Figure 6 For this utility model Figure 5 A partial enlarged view of the middle B area;

[0040] Figure 7 For this utility model Figure 2 A partial enlarged view of area A.

[0041] Figure numerals: 1, drill barrel; 2, cooling channel; 3, joint; 4, first heat dissipation hole; 5, drill body; 6, ball tooth; 7, second heat dissipation hole; 8, rotating shaft; 9, spiral blade; 10, connecting sleeve; 11, sliding head; 12, first sealing ring; 13, support plate; 14, bearing; 15, closing plate; 16, second sealing ring; 17, collecting pipe; 18, shell; 19, driving motor; 20, rotating joint; 21, cooling pipe; 22, driving gear; 23, driven gear; 24, handle; 25, slider; 26, temperature sensor; 301, driving section; 302, sliding section; 303, connecting part; 3011, first slide groove; 3012, second slide groove. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0043] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0044] Reference Figure 1-2 The utility model provides a drilling device specially designed for frozen soil monitoring, including a cryogenic drill bit, a lifting assembly, a drill barrel 1 and a power assembly. Among them: a cooling channel 2 is provided in the cryogenic drill bit, and the cooling channel 2 of the cryogenic drill bit can be filled with cooling gas or liquid, such as liquid nitrogen, to keep the drill bit working in a low-temperature environment and avoid the melting of the surrounding frozen soil due to friction heat conduction during the drilling process. The lifting assembly is coaxially rotatably connected to the upper end of the cryogenic drill bit, and is used to lift the drilled frozen soil and allow it to enter the drill barrel 1. The drill barrel 1 is sleeved on the surrounding side of the cryogenic drill bit and the lifting assembly, and is used to protect the cryogenic drill bit and the lifting assembly, and collect the drilled frozen soil samples at the same time. The power assembly is used to drive the cryogenic drill bit to rotate and provide power for the rotation of the cryogenic drill bit.

[0045] Reference Figure 3-6As shown, the cryogenic drill bit consists of a joint 3 and a drill body 5. The upper end of the joint 3 is coaxially rotatably connected to the lifting assembly and is provided with a cooling channel 2. The joint 3 is fixedly connected to the drill body 5. A ball tooth 6 is protruding from the lower end of the drill body 5. Heat dissipation holes connected to the cooling channel 2 are provided on the joint 3 and / or the drill body 5.

[0046] The heat dissipation holes are designed to be at least one of the following two structures: one is that a plurality of radially arranged first heat dissipation holes 4 are arranged on the joint 3; the other is that a plurality of axially arranged second heat dissipation holes 7 are arranged on the drill body 5, and both the first heat dissipation holes 4 and the second heat dissipation holes 7 are connected to the cooling channel 2.

[0047] The lifting assembly includes a rotating shaft 8 and a spiral blade 9, wherein the rotating shaft 8 is a hollow structure, the spiral blade 9 is fixedly connected to the outer wall of the upper section of the rotating shaft 8, a cooling channel 2 is arranged in the rotating shaft 8, and the lower end of the rotating shaft 8 is slidingly connected to the joint 3 in the radial direction, and the cooling channel 2 of the rotating shaft 8 is connected to the cooling channel 2 of the joint 3.

[0048] In addition, the device also includes a connecting sleeve 10 fixedly connected to the inside of the drill pipe 1, the connecting sleeve 10 is connected to the drill pipe 1 through a connecting plate, and a sliding head 11 is fixedly installed in the radial direction of the connecting sleeve 10. The joint 3 includes a driving section 301, a sliding section 302 and a connecting portion 303 fixedly connected in sequence from top to bottom, the driving section 301 is located inside the connecting sleeve 10 and a first sliding groove 3011 in a closed wave shape is arranged around the outer wall, the sliding head 11 is slidably connected to the first sliding groove 3011, the sliding section 302 is slidably connected to the connecting sleeve 10 along the axial direction of the connecting pipe, a cooling channel 2 is arranged in the sliding section 302 and the connecting portion 303, the connecting portion 303 is arranged with a first heat dissipation hole 4, and the connecting portion 303 is fixedly connected to the drill bit body 5; the lower end of the rotating shaft 8 is slidably connected to the driving section 301 and the sliding section 302.

[0049] Optionally, a temperature sensor 26 is provided in the connecting sleeve 10 of the utility model. The temperature sensor 26 is arranged in the connecting sleeve 10 to avoid contact with the frozen soil in the drill barrel 1, thereby avoiding damage to the temperature sensor 26. The temperature sensor 26 is arranged relative to the driving section 301. The joint 3 and the drill bit body 5 of the utility model are both made of metal and have good thermal conductivity. The temperature of the driving section 301 is monitored by the temperature sensor 26, and the temperature of the joint 3 and the drill bit body 5 can be obtained. By adding cooling gas or liquid in the cooling channel 2, the temperature of the low-temperature drill bit can be made close to the outdoor working temperature, thereby reducing the impact on the frozen soil and reducing the test error.

[0050] It should be understood that a cooling channel 2 is also provided in the rotating shaft 8 , and cooling gas and liquid pass through the rotating shaft 8 , which can achieve the effect of cooling the rotating shaft 8 and the spiral blades 9 .

[0051] The inner wall of the driving section 301 is axially provided with a second slide groove 3012, and the outer wall of the lower end of the rotating shaft 8 is fixedly connected with a slider 25, the slider 25 is slidably connected to the second slide groove 3012, and a first sealing ring 12 is installed on the rotating shaft 8 arranged opposite to the sliding section 302, and the first sealing ring 12 is interference fit with the cooling channel 2 of the sliding section 302.

[0052] Reference Figure 7 The inner side wall of the upper section of the drill tube 1 is fixedly connected with an annular support plate 13 and a closing plate 15. The support plate 13 is located on the upper side of the closing plate 15. The rotating shaft 8 is rotatably connected to the support plate 13 through a bearing 14. A second sealing ring 16 is installed on the peripheral side of the rotating shaft 8 opposite to the closing plate 15. The second sealing ring 16 is interference fit with the inner side wall of the closing plate 15. The outer side wall of the upper end of the drill tube 1 is fixedly connected with a collecting pipe 17. The collecting pipe 17 is connected to the drill tube 1 and is located below the closing plate 15. In this design, the closing plate 15 is used to gather frozen soil and achieve the effect of limiting. The collected frozen soil can be discharged from the drill tube 1 by using the collecting pipe 17, without using the rotating shaft 8 to drive the spiral blade 9 to reverse, thereby improving the drilling efficiency.

[0053] The power assembly includes a shell 18 fixedly connected to the drill tube 1, a handle 24 is installed on the shell 18, the upper end of the rotating shaft 8 is located in the shell 18; and a drive motor 19 fixedly connected in the shell 18, and the drive motor 19 is connected to the upper end of the rotating shaft 8 through a reduction gear set.

[0054] A rotary joint 20 is installed at the upper end of the rotating shaft 8 , and a cooling pipe 21 is connected to the rotary joint 20 . The cooling pipe 21 is connected to the cooling channel 2 through the rotary joint 20 , and the cooling pipe 21 is arranged through the shell 18 .

[0055] The reduction gear set includes a driving gear 22 keyed to the output shaft of the driving motor 19 , and a driven gear 23 whose upper end of the rotating shaft 8 passes through the support plate 13 and is keyed. The driven gear 23 is located in the housing 18 and is transmission-connected to the driving gear 22 .

[0056] The working principle of this utility model:

[0057] When in use, the drill barrel 1 is aligned with the position to be drilled, and the drive motor 19 is energized by an external power supply. After the drive motor 19 is started, it drives the active gear 22 to rotate, and further drives the driven gear 23 and the rotating shaft 8 to rotate. During the rotation of the rotating shaft 8, the drive section 301 can be driven to rotate. At this time, the sliding head 11 slides synchronously on the first slide groove 3011, and the slider 25 slides on the second slide groove 3012, which can achieve the effect of the drill bit moving back and forth along the axial direction of the drill barrel 1, and the ball teeth 6 are used to impact the frozen soil. At the same time, during the rotational impact process of the frozen soil, a part of the frozen soil can be brought into the drill barrel 1 and conducted upward through the spiral blades 9 until it is exported from the collection pipe 17.

[0058] During the drilling process, the friction heat generated during the drilling process causes the surrounding frozen soil to melt. The cooling liquid or gas is injected into the cooling channel 2 by using the cooling pipe 21 to cool the rotating shaft 8, the spiral blades 9, the joint 3 and the drill bit body 5. The temperature of the driving section 301 is measured by the temperature sensor 26 to ensure that the rotating shaft 8, the spiral blades 9, the joint 3 and the drill bit body 5 are at the outdoor temperature, thereby reducing the impact on the frozen soil and improving the representativeness of the frozen soil samples and the accuracy of the data.

[0059] After use, the drill tube 1 is taken out of the borehole and the drive motor 19 is turned off.

[0060] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0061] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A drilling device for frozen soil monitoring, characterized in that: include: A cryogenic drill bit having a cooling channel (2) therein, wherein the cooling channel (2) is used to be filled with cooling gas or liquid; a lifting assembly coaxially connected to the upper end of the cryogenic drill bit for rotation, the lifting assembly comprising a rotating shaft (8) of a hollow structure and a spiral blade (9) fixedly connected to the outer side wall of the upper section of the rotating shaft (8); a drill barrel (1) sleeved around the cryogenic drill bit and the lifting assembly; and A power assembly for driving the cryogenic drill to rotate.

2. The drilling device for frozen soil monitoring according to claim 1, characterized in that: The cryogenic drill bit comprises a joint (3) and a drill bit body (5); the upper end of the joint (3) is coaxially rotatably connected to the lifting assembly and is provided with the cooling channel (2); the joint (3) is fixedly connected to the drill bit body (5); a ball tooth (6) is protruding from the lower end of the drill bit body (5); and heat dissipation holes connected to the cooling channel (2) are provided on the joint (3) and / or the drill bit body (5).

3. The drilling device for frozen soil monitoring according to claim 2, characterized in that: The heat dissipation hole includes at least one of the following structures: Structure 1: The joint (3) is provided with a plurality of radially arranged first heat dissipation holes (4), and the first heat dissipation holes (4) are connected to the cooling channel (2); Structure 2: The drill body (5) is provided with a plurality of axially arranged second heat dissipation holes (7), and the second heat dissipation holes (7) are connected to the cooling channel (2).

4. The drilling device for frozen soil monitoring according to claim 3, characterized in that: A cooling channel (2) is arranged inside the rotating shaft (8), and the lower end of the rotating shaft (8) is slidably connected to the joint (3) in a radial direction, and the cooling channel (2) of the rotating shaft (8) is in communication with the cooling channel (2) of the joint (3).

5. The drilling device for frozen soil monitoring according to claim 4, characterized in that: Also includes: A connecting sleeve (10) fixedly connected to the inside of the drill pipe (1), wherein a sliding head (11) is fixedly mounted in the radial direction of the connecting sleeve (10); The joint (3) comprises a driving section (301), a sliding section (302) and a connecting portion (303) which are hollow in structure and are fixedly connected in sequence from top to bottom. The driving section (301) is located inside the connecting sleeve (10) and is surrounded by an outer wall thereof with a first sliding groove (3011) in a closed wave shape. The sliding head (11) is slidably connected to the first sliding groove (3011). The sliding section (302) is slidably connected to the connecting sleeve (10). The cooling channel (2) is provided in the sliding section (302) and the connecting portion (303). The connecting portion (303) is provided with a first heat dissipation hole (4). The connecting portion (303) is fixedly connected to the drill bit body (5). The lower end of the rotating shaft (8) is slidably connected to the driving section (301) and the sliding section (302).

6. The drilling device for frozen soil monitoring according to claim 5, characterized in that: The inner side wall of the driving section (301) is axially provided with a second slide groove (3012), the outer side wall of the lower end of the rotating shaft (8) is fixedly connected with a slider (25), the slider (25) is slidably connected with the second slide groove (3012), and a first sealing ring (12) is installed on the rotating shaft (8) arranged opposite to the sliding section (302), and the first sealing ring (12) is interference fit with the cooling channel (2) of the sliding section (302).

7. The drilling device for frozen soil monitoring according to claim 6, characterized in that: An annular support plate (13) and a closing plate (15) are fixedly connected to the inner side wall of the upper section of the drill tube (1); the support plate (13) is located on the upper side of the closing plate (15); the rotating shaft (8) is rotatably connected to the support plate (13) via a bearing (14); a second sealing ring (16) is installed on the circumferential side of the rotating shaft (8) opposite to the closing plate (15); the second sealing ring (16) is interference-fitted with the inner side wall of the closing plate (15); A collecting pipe (17) is fixedly connected to the outer side wall of the upper end of the drill tube (1); the collecting pipe (17) is in communication with the drill tube (1); and the collecting pipe (17) is located below the closing plate (15).

8. The drilling device for frozen soil monitoring according to claim 7, characterized in that: The power assembly comprises: a housing (18) fixedly connected to the drill tube (1), the upper end of the rotating shaft (8) being located inside the housing (18); and A drive motor (19) is fixedly connected to the housing (18), and the drive motor (19) is transmission-connected to the upper end of the rotating shaft (8) via a reduction gear set.

9. The drilling device for frozen soil monitoring according to claim 8, characterized in that: A rotary joint (20) is installed at the upper end of the rotating shaft (8), and the rotary joint (20) is connected to a cooling pipe (21). The cooling pipe (21) is connected to the cooling channel (2) through the rotary joint (20), and the cooling pipe (21) is arranged to penetrate the shell (18).

10. The drilling device for frozen soil monitoring according to claim 9, characterized in that: The reduction gear set comprises: A driving gear (22) is key-connected to the output shaft of the driving motor (19), and The upper end of the rotating shaft (8) passes through the supporting plate (13) and is key-connected to a driven gear (23), wherein the driven gear (23) is located in the housing (18) and is transmission-connected to the driving gear (22); The housing (18) is equipped with a handle (24).

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