A soft rock coring device and method using high-speed atomized water for cooling

Abstract

The present invention discloses a soft rock coring device and method using high-speed atomized water cooling, comprising a drill rod, a cover, a gas generator and a rotary driver, the drill rod is hollow, the two ends of the drill rod are a connecting end and a drill bit end respectively, the rotary driver comprises a rotating shaft and a rotary joint, the connecting end of the drill rod can be installed on the rotating shaft, a central hole connected to the inner cavity of the drill rod is arranged in the rotating shaft, the rotary joint is rotatably connected to the outer periphery of the rotating shaft and connected to the central hole, and a rotary interface one is arranged on the outer periphery of the rotary joint; the drill bit end of the drill rod is used to drill into the soft rock for coring, the cover is annular, sleeved on the outer periphery of the drill rod, and can cover the outer gap between the drill bit end and the soft rock, a cover interface one is arranged outside the cover, and the cover interface one is connected to an air outlet pipeline; the output end of the gas generator is connected to the rotary interface one through an air inlet pipeline. The present invention uses gas carrying atomized water to cool the drill rod, which can effectively dissipate heat for the drill rod and will not cause damage to the soft rock.

Description

Technical Field

[0001] The present invention relates to the field of soft rock test research, and more specifically, to a soft rock coring device using high-speed atomized water for cooling, and also to a soft rock coring method using high-speed atomized water for cooling. Background Art

[0002] Soft rock is a rock classification, which refers to a type of rock formed under low temperature and low pressure conditions. Soft rock plays an important role in geology. Soft rock is usually composed of clastic rocks or chemical sedimentary rocks containing a high proportion of clay minerals, quartz and feldspar. This type of rock has low strength, large porosity, poor cementation, and is easily affected by the external environment, forming multiple groups of cracks.

[0003] The geological environment in engineering construction is complex, and it is necessary to measure the strength information of various types of rocks. There are relatively mature equipment and methods for sampling and testing medium and high strength rocks. In the process of coring, drilling is usually used for sampling. In the process of drilling rock samples, the drill rod will produce friction with the rock mass and generate a lot of heat. In this process, water is needed to flush and cool it down.

[0004] However, soft rock sampling is extremely difficult because soft rock is soft and has many cracks. It is easy to dissolve and break when it comes into contact with water, making it difficult to sample soft rock. If dry drilling is used directly for sampling, the drill bit cannot be cooled down, which can easily lead to the drill bit being overheated and melted, and it is also impossible to effectively drill soft rock.

[0005] Therefore, a new solution needs to be proposed to solve this problem. Summary of the invention

[0006] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and to provide a soft rock coring device and method using high-speed atomized water for cooling. The drill pipe is cooled by gas carrying atomized water, which can effectively dissipate the heat of the drill pipe and will not cause damage to the soft rock.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] A soft rock coring device using high-speed atomized water for cooling comprises a drill rod, a cover, a gas generator and a rotary driver, wherein both ends of the drill rod are connected, and the two ends of the drill rod are respectively a connecting end and a drill bit end, and the rotary driver comprises a rotating shaft and a rotary joint, and the connecting end of the drill rod can be installed on the rotating shaft, and a central hole communicating with an inner cavity of the drill rod is arranged in the rotating shaft, and the rotary joint is rotatably connected to the outer periphery of the rotating shaft and communicated with the central hole, and a rotary interface 1 is arranged on the outer periphery of the rotary joint; the drill bit end of the drill rod is used for drilling into soft rock for coring, the cover is annular, sleeved on the outer periphery of the drill rod, and can cover the outer gap between the drill bit end and the soft rock, a cover interface 1 is arranged outside the cover, and the cover interface 1 is connected to an air outlet pipeline; the gas generator is used to generate gas with atomized water, and the output end of the gas generator is connected to the rotary interface 1 through an air inlet pipeline, and can transport gas with atomized water into the drill rod, and the gas with atomized water is cooled through the drill bit end.

[0009] The present invention is further configured such that the gas generator includes a high-pressure gas source, an atomizing humidifier and a control valve, the high-pressure gas source is used to output high-pressure gas, the atomizing humidifier is used to atomize and humidify the output high-pressure gas, and the control valve is used to control the on and off of the high-pressure gas; the air inlet pipeline is installed with a temperature and humidity detector 1, and the air outlet pipeline is installed with a temperature and humidity detector 2.

[0010] The present invention is further configured to further include a suction device for applying negative pressure to the air outlet pipeline.

[0011] The present invention is further configured such that a sealing ring 1 is installed on the side of the cover body facing away from the soft rock, and the sealing ring is arranged on the outer periphery of the drill pipe and is adapted to the outer diameter of the drill pipe; a sealing ring 2 is installed on the side of the cover body facing the soft rock, and the sealing ring 2 is used to abut against the surface of the soft rock.

[0012] The present invention is further configured to further include a spiral slag remover, wherein the spiral slag remover has an air inlet, and the air outlet pipeline is connected to the air inlet.

[0013] The present invention is further configured such that the spiral slag remover includes a cylindrical shell and spiral blades, wherein the spiral blades are located inside the cylindrical shell and can be driven to rotate by a driver; the spiral blades form the inner cavity of the cylindrical shell into a spiral chamber; the air inlet is located at one end of the cylindrical shell, and an air outlet is opened at the other end of the cylindrical shell.

[0014] The present invention is further configured such that a cover body interface 2 is further provided outside the cover body, the air intake pipeline includes a three-way valve 1, the three-way valve 1 has three connection ends, the three connection ends of the three-way valve 1 are respectively connected to the output end of the gas generator, the rotating interface 1 and the cover body interface 2, and the three-way valve 1 can control the output end of the gas generator to be connected to the rotating interface 1 or the cover body interface 2;

[0015] A rotary interface 2 is arranged on the periphery of the rotary joint, and the air outlet pipeline includes a three-way valve 2, and the three-way valve 2 has three connecting ends. The three connecting ends of the three-way valve 2 are respectively connected to the exhaust end of the air outlet pipeline, the rotary interface 2 and the cover body interface 1, and the three-way valve 2 can control the exhaust end of the air outlet pipeline to connect to the cover body interface 1 or the rotary interface 2.

[0016] The present invention is further configured such that the three-way valve 1 and the three-way valve 2 have two states. In the first state, the three-way valve 1 controls the output end of the gas generator to be connected to the rotating interface 1, and at the same time, the three-way valve 2 controls the exhaust end of the gas outlet pipeline to be connected to the cover body interface 1;

[0017] In the second state, three-way valve one controls the output end of the gas generator to be connected to cover body interface two, and at the same time, three-way valve two controls the exhaust end of the gas outlet pipeline to be connected to rotating interface two.

[0018] The present invention also provides a soft rock coring method using high-speed atomized water for cooling. The soft rock coring device as described above is used. During the coring process, a gas generator generates gas carrying atomized water. The gas can flow along the air inlet pipeline and the rotating interface into the inner cavity of the drill pipe, flow downward in the inner cavity of the drill pipe, and move along the inner gap between the drill pipe and the core to cool the drill bit end. Then, the gas will leave from the outer gap between the drill pipe and the soft rock to cool the drill bit end of the drill pipe.

[0019] The present invention also provides a soft rock coring method using high-speed atomized water for cooling, using the soft rock coring device as described above, during the coring process, a gas generator generates gas carrying atomized water to cool the drill bit end of the drill pipe; in the early stage of drilling and coring, the method operates in a first state to drill the drill bit end of the drill pipe into the soft rock and reach a preset depth; then, the method operates in a second state to continuously cool the drill bit end of the drill pipe until the drilling sampling is completed.

[0020] In summary, the present invention has the following beneficial effects:

[0021] By using gas carrying atomized water to cool the drill pipe, the drill pipe can be effectively cooled. When the atomized water contacts the high-temperature drill bit, it can cool the drill bit through direct heat exchange. During the heat dissipation process, the temperature of the atomized water will rise, and part of the original mist droplets in the atomized water can also evaporate. The evaporation process can also absorb heat, which plays a role in heat dissipation. Moreover, the gas containing atomized water has a low water content and will not produce the effect of concentrated flushing of a large amount of water, which will not cause the soft rock to soften, disintegrate, or crack due to excessive water, thus avoiding damage to the soft rock due to excessive water, and can effectively dissipate heat from the drill bit.

[0022] In the process of drilling the core, two states are used for air intake. The first state is used for air intake cooling. After drilling to a certain depth, it is necessary to switch to the second state. In the first state, the heat dissipation of the drill rod and the drill head is more direct. As the drilling reaches a certain depth, the length of the core in the drill rod increases, and the path length of the gas of the atomized water flowing through the inner gap increases. If it continues to operate in the first state, the core inside the drill rod may absorb more water. Therefore, when drilling to the predetermined depth, it is switched to the second state. In the second state, the gas carrying the atomized water first enters from the outer gap of the drill rod and then flows out from the inner gap. The inner gap is the position in contact with the core. When the gas passes through the outer gap between the outer wall of the drill pipe and the soft rock, the soft rock on the outer wall of the drill pipe will absorb most of the moisture. When the gas passes through the drill bit end and enters the inside of the drill pipe, the moisture it carries will be greatly reduced. Even if the atomized water content in the gas is appropriately increased, it will not damage the drilled core. The collected core can be protected and a core sample in good condition can be formed. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the structure of a soft rock coring device using high-speed atomized water for cooling in Example 1 Figure 1 ;

[0024] Figure 2 A schematic diagram of the structure of a soft rock coring device using high-speed atomized water for cooling in Example 1 Figure 2 ;

[0025] Figure 3 It is a structural schematic diagram of the drill rod, soft rock, cover body and rotary driver in Example 1;

[0026] Figure 4 It is a structural schematic diagram of the drill rod and the rotary driver in the first embodiment;

[0027] Figure 5 It is a structural schematic diagram of the drill rod, soft rock and cover body in Example 1;

[0028] Figure 6 It is a structural schematic diagram of the spiral slag remover in Example 1;

[0029] Figure 7 This is a flow diagram of the first state in the second embodiment;

[0030] Figure 8 This is a flow diagram of the second state in the second embodiment.

[0031] Figure numerals: soft rock 100; drill rod 10; connecting end 11; drill bit end 12; outer gap 121; inner gap 122; cover body 20; sealing ring 1 21; cover body interface 1 22; sealing ring 2 23; cover body interface 2 24; gas generator 30; high-pressure gas source 31; atomizing humidifier 32; control valve 33; air inlet pipeline 40; temperature and humidity detector 1 41; three-way valve 1 401; spiral slag remover 50; cylindrical shell 51; spiral blade 52; air inlet 53; air outlet 54; air outlet pipeline 60; three-way valve 2 601; temperature and humidity detector 2 61; exhaust end 62; rotary drive 70; rotating shaft 71; connecting part 72; center hole 73; rotary joint 74; rotary interface 1 75; rotary interface 2 76; suction device 80. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Embodiment 1

[0034] This embodiment discloses a soft rock coring device that uses high-speed atomized water for cooling, which is used for coring soft rock holes. During the coring process, the drill rod is cooled by gas carrying atomized water, which can effectively dissipate heat from the drill rod. When the atomized water contacts the high-temperature drill bit end, it can cool the drill bit end by direct heat exchange. Moreover, the water content in the gas is relatively low, which will not cause the soft rock to soften, disintegrate, or break due to excessive water. After the temperature of the atomized water increases during the heat dissipation process, part of the original mist droplets in the atomized water can also evaporate into water vapor. The evaporation process can also absorb heat, thereby effectively dissipating heat from the drill bit end and preventing the soft rock from being exposed to excessive water.

[0035] Reference Figure 1-Figure 5 As shown, the soft rock coring device in this embodiment includes a drill rod 10, a cover body 20, a gas generator 30 and a rotary driver 70. The drill rod 10 is a hollow long cylindrical structure, and the two ends of the drill rod 10 are a connecting end 11 and a drill bit end 12 respectively. The connecting end 11 is used for installation, and the drill bit end 12 is used for drilling and coring.

[0036] Reference Figure 3 , Figure 4As shown, the rotary driver 70 includes a rotating shaft 71 and a rotating joint 74, and the connecting end 11 of the drill rod 10 can be installed on the rotating shaft 71. Generally, a connecting portion 72 can be pre-fixed at the end of the rotating shaft 71, and the connecting portion 72 and the connecting end 11 of the drill rod 10 can be adapted to each other, so that the connecting end 11 of the drill rod 10 can be installed to the connecting portion 72 for fixation.

[0037] A center hole 73 is provided in the rotating shaft 71, and the center hole 73 is passed through toward one end of the drill rod 10, so that the center hole 73 can be connected to the inner cavity of the drill rod 10. The rotary joint 74 is rotatably connected to the outer periphery of the rotating shaft 71, and plays a role of rotary connection. During the rotation of the rotating shaft 71, the rotary joint 74 remains fixed, and the rotating shaft 71 is provided with a connecting hole, which can connect the center hole 73 and the annular inner cavity in the rotary joint 74. A rotary interface 1 75 is provided on the outer periphery of the rotary joint 74, and the center hole 73 is connected through the rotary interface 1 75, and then the inner cavity of the drill rod 10 is connected.

[0038] Specifically, the gas generator 30 in this embodiment includes a high-pressure gas source 31, an atomizing humidifier 32 and a control valve 33. The high-pressure gas source 31 can be an air pump, which can generate and output high-pressure gas. The atomizing humidifier 32 can be an ultrasonic atomizer or a spray atomizer, which can atomize and humidify the output high-pressure gas and increase the humidity of the output high-pressure gas. The control valve 33 can control the on-off of the high-pressure gas.

[0039] In order to maintain stability during the coring process and effectively dissipate heat from the drill bit end 12, a temperature and humidity detector 1 41 is installed on the air inlet pipeline 40, and a temperature and humidity detector 2 61 is installed on the air outlet pipeline 60. The two sets of temperature and humidity detectors can respectively detect the gas state in the air inlet pipeline 40 and the air outlet pipeline 60, and detect the temperature and humidity of the gas.

[0040] Reference Figure 3 , Figure 5 As shown, the cover body 20 is annular and is sleeved on the outer periphery of the drill rod 10, and can cover the outer gap 121 between the drill bit end 12 and the soft rock 100. The cover body 20 can play a protective role and prevent dust and mud from splashing directly from the outer gap 121 on the outer periphery of the drill bit end 12.

[0041] A sealing ring 21 is installed on the side of the cover body 20 facing away from the soft rock 100. The sealing ring 21 is sleeved on the outer periphery of the drill rod 10 and is adapted to the outer diameter of the drill rod 10, which can ensure smooth rotation of the drill rod 10 and roughly maintain the seal between the drill rod 10 and the sealing ring 21. A sealing ring 23 is installed on the side of the cover body 20 facing the soft rock 100. The sealing ring 23 is used to abut against the surface of the soft rock 100. The sealing ring 23 can maintain a rough seal between the lower side of the cover body 20 and the soft rock 100. The cover body 20 can form a roughly sealed chamber space between the outer periphery of the drill rod 10 and the soft rock 100, which can play a protective role and can collect mud dust that may be generated during the drilling and coring process to prevent it from being dispersed under the purge of high-pressure gas.

[0042] A cover body interface 22 is provided outside the cover body 20, and the cover body interface 22 is connected to an air outlet pipeline 60. The gas in the cover body 20 can be discharged through the cover body interface 22 and the air outlet pipeline 60 to balance the air pressure in the cover body 20, and the fly ash and mud residue in the cover body 20 can also be collected.

[0043] Reference Figure 1 , Figure 2 , Figure 6 As shown, the soft rock coring device in this embodiment further includes a spiral slag remover 50, which has an air inlet 53, and an air outlet pipeline 60 is connected to the air inlet 53. The spiral slag remover 50 can collect dust and mud in the tail gas at the end, so that they can be gathered in the spiral slag remover 50.

[0044] Reference Figure 6 As shown, the spiral slag remover 50 includes a cylindrical shell 51 and a spiral blade 52, an air inlet 53 is located at one end of the cylindrical shell 51, and an air outlet 54 is opened at the other end of the cylindrical shell 51. The spiral blade 52 is located inside the cylindrical shell 51 and can be driven to rotate by a driver. The spiral blade 52 has a spiral structure, and the outer contour is slightly smaller than the cylindrical shell 51. The spiral blade 52 can form a spiral chamber in the inner cavity of the cylindrical shell 51. The dust is blocked by the spiral chamber flow channel, so that the mud and dust in the exhaust gas can be deposited and accumulated. In order to improve the dust collection effect, some water can be pre-installed in the cylindrical shell 51, and the fly ash and dust in the exhaust gas can be captured and absorbed by the water.

[0045] In order to maintain smooth gas flow, the soft rock coring device in this embodiment further includes a suction device 80, which is connected to the gas outlet pipeline 60 and can generate a negative pressure suction effect on the gas outlet pipeline 60, thereby forming a negative pressure in the inner cavity of the cover body 20, so that air can flow smoothly between the drill rod 10, the cover body 20 and the gas outlet pipeline 60. Specifically, the suction device 80 can be a vacuum pump or a fan, and the installation position can be at the rear end or the front end of the spiral slag remover 50.

[0046] The present embodiment also discloses a soft rock coring method using high-speed atomized water for cooling, using the soft rock coring device as in the above embodiment. During the coring process, the drill bit end 12 of the drill rod 10 drills into the soft rock 100, and an outer side of the drill bit end 12 forms an outer gap 121 with the soft rock 100, and an inner periphery of the drill bit end 12 forms a rock core, and an inner gap 122 is formed between the inner periphery of the drill bit end 12 and the rock core.

[0047] During the coring process, the gas generator 30 can generate gas with atomized water, and the output end of the gas generator 30 is connected to the rotating interface 75 through the air inlet pipeline 40. The gas carrying atomized water can flow along the gas generator 30, the air inlet pipeline 40, the rotating interface 75, and the inner cavity of the drill rod 10, and flow downward in the inner cavity of the drill rod 10, and move along the inner gap 122 between the drill rod 10 and the core until the drill bit end 12 of the drill rod 10 is heated, and the drill bit end 12 is cooled; then, the gas will leave from the outer gap 121 between the drill rod 10 and the soft rock 100 until the surface of the soft rock 100, so as to realize the circulation of gas. The gas overflowing from the outer gap 121 is collected in the cover body 20, and then flows out from the cover body interface 22, and enters the spiral slag remover 50 along the air outlet pipeline 60, so as to collect the fly ash impurities in the tail gas.

[0048] When the temperature difference between the air inlet pipeline 40 and the air outlet pipeline 60 is too large, it means that the heat dissipation pressure becomes larger. The heat dissipation effect on the drill bit end 12 can be improved by increasing the air flow rate or air humidity of the air inlet pipeline 40. When the temperature difference between the air inlet pipeline 40 and the air outlet pipeline 60 is too small, it means that the heat dissipation pressure becomes smaller. The air humidity of the air inlet pipeline 40 can be reduced to slightly reduce the heat dissipation effect, which can also reduce the influence of moisture on the soft rock 100.

[0049] Embodiment 2

[0050] This embodiment discloses a soft rock coring device using high-speed atomized water for cooling. Figure 7 , Figure 8 A detailed description is given, in which the connection structure of the cover body 20, the rotary joint 74, the air pipe 40, and the air outlet pipe 60 is further designed, so that two gas circulation methods can be formed.

[0051] The cover body 20 is also provided with a cover body interface 24, that is, the cover body 20 has two interfaces, namely, the cover body interface 1 22 and the cover body interface 2 24. The outer periphery of the rotary joint 74 is provided with a rotary interface 2 76, that is, the rotary joint 74 also has two interfaces, namely, the rotary interface 1 75 and the rotary interface 2 76.

[0052] The two three-way valves can control the flow directions among the four interfaces, namely, the cover body interface 1 22, the cover body interface 24, the rotation interface 1 75 and the rotation interface 2 76, to form two flow states.

[0053] Specifically, the air intake line 40 includes a three-way valve 401, which has three connection ends. The three connection ends of the three-way valve 401 are respectively connected to the output end of the gas generator 30, the rotating interface 75 and the cover interface 24. In the three-way valve 401, the two connection ends corresponding to the rotating interface 75 and the cover interface 24 can be controlled to be on and off, and the two are always one on and one off. The three-way valve 401 can control the output end of the gas generator 30 to connect to the rotating interface 75 or the cover interface 24.

[0054] The air outlet pipeline 60 includes a three-way valve 2 601, which has three connection ends. The three connection ends of the three-way valve 2 601 are respectively connected to the exhaust end 62 of the air outlet pipeline 60, the second rotating interface 76 and the cover body interface 1 22. Similarly, in the three-way valve 2 601, the two connection ends corresponding to the cover body interface 1 22 and the second rotating interface 76 can be controlled to be on and off, and both are always one on and one off. The three-way valve 2 601 can control the exhaust end 62 of the air outlet pipeline 60 to be connected to the cover body interface 1 22 or the second rotating interface 76.

[0055] The three-way valve 1 401 and the three-way valve 2 601 have two states. In the first state, the three-way valve 1 401 controls the connection end of the cover body interface 2 24 to be closed, the connection end of the rotating interface 1 75 to be opened, and the output end of the gas generator 30 is connected to the rotating interface 1 75. At the same time, the three-way valve 2 601 controls the connection end of the rotating interface 2 76 to be closed, the connection end of the cover body interface 1 22 to be opened, and the exhaust end 62 of the gas outlet pipeline 60 is connected to the cover body interface 1 22. In the second state, the three-way valve 1 401 controls the connection end of the rotating interface 1 75 to be closed, the connection end of the cover body interface 24 to be opened, and the output end of the gas generator 30 is connected to the cover body interface 2 24. At the same time, the three-way valve 2 601 controls the connection end of the cover body interface 1 22 to be closed, the connection end of the rotating interface 2 76 to be opened, and the exhaust end 62 of the gas outlet pipeline 60 is connected to the rotating interface 2 76.

[0056] Reference Figure 7As shown, in the first state, the gas generator 30 generates gas carrying atomized water, and the gas flows through the air inlet pipeline 40, enters the rotary joint 74 from the rotary interface 75, and then enters the upper end of the inner cavity of the drill rod 10. It flows downward in the inner cavity of the drill rod 10, moves along the inner gap 122 between the drill rod 10 and the core, and moves until the drill end 12 of the drill rod 10 is heated, cooling the drill end 12; then, the gas will leave from the outer gap 121 between the drill rod 10 and the soft rock 100 until the surface of the soft rock 100, realizing the circulation of the gas. The gas overflowing from the outer gap 121 is collected in the cover body 20, and then flows out from the cover body interface 22, and enters the spiral slag remover 50 along the air outlet pipeline 60, which can collect the fly ash impurities in the tail gas. The first state is consistent with the gas flow direction of Example 1.

[0057] Reference Figure 8 As shown, in the second state, the gas generator 30 generates gas carrying atomized water, and the gas flows through the air inlet pipeline 40, enters the inner cavity of the cover body 20 from the cover body interface 24, and then enters the outer gap 121 between the drill rod 10 and the soft rock 100 from the inner cavity of the cover body 20, until the drill bit end 12 of the drill rod 10 is heated, and the drill bit end 12 is cooled; then, the gas will leave upward from the inner gap 122 between the drill rod 10 and the core until it enters the inner cavity of the drill rod 10, and then the gas in the drill rod 10 continues to flow upward, passes through the rotary joint 74, leaves from the rotary interface 2 76, enters the air outlet pipeline 60, and enters the spiral slag remover 50 along the air outlet pipeline 60, so as to collect the fly ash impurities in the exhaust gas.

[0058] This embodiment also discloses a soft rock coring method using high-speed atomized water cooling, using the soft rock coring device as described above, during the coring process, the gas generator 30 generates gas carrying atomized water to cool the intake of the drill bit end 12 of the drill rod 10. In the early stage of drilling and coring, the drill bit end 12 of the drill rod 10 is operated in the first state, and the drill bit end 12 of the drill rod 10 is drilled into the soft rock 100, and the depth of the drill bit end 12 of the drill rod 10 is controlled to be 5-10 cm, which can be specifically selected according to the type of soft rock; then, the drill bit end 12 of the drill rod 10 is operated in the second state, and the temperature is continuously cooled until the required depth is reached, and the drilling sampling is completed.

[0059] When operating in the first state, the gas carrying atomized water flows from the inner circumference of the drill rod 10, and can fully contact the inner circumference of the drill rod 10. Moreover, after the water vapor droplets adhere to the inner wall of the drill rod 10, they can stay along the inner wall and flow to the vicinity of the drill bit end 12, which has a better heat dissipation effect and can also discharge the fly ash mud residue generated by the drilling. However, as the depth of the drilling hole increases, the length of the core in the drill rod 10 increases, and the axial depth of the inner gap 122 will increase. When the gas carrying atomized water flows through the inner gap 122, it will contact the core in the drill rod 10. The atomized water carried in the gas will be absorbed by the core, resulting in a significant reduction in the atomized water content flowing to the drill bit end 12. As the depth increases, the water content flowing to the drill bit end 12 will further decrease, resulting in a significant reduction in cooling; and if the atomized water content in the gas is increased, it will have an adverse effect on the core, causing the core surface to be too wet, which may cause softening, disintegration, rupture and other effects.

[0060] Therefore, after drilling to a certain depth, it is necessary to switch to the second state, and the gas carrying atomized water enters from the outer gap 121 of the drill rod 10 and then flows out from the inner gap 122. When the gas descends from the outer gap 121 between the drill rod 10 and the soft rock 100, the soft rock 100 contacted by the gas carrying atomized water in the outer gap is an unnecessary part, which can protect the collected core inside. Therefore, the water content of the input gas can be appropriately increased, which can meet the cooling requirements and will not damage the core inside the drill rod 10. Moreover, as the gas flows downward, part of the water will be absorbed by the soft rock 100 on the periphery of the drill rod 10. When it reaches the position close to the drill bit end 12, the water content will be reduced again, and it will not damage the soft rock 100 in the drilling part, and a core sample in good condition can be formed.

[0061] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A soft rock coring method using high-speed atomized water for cooling, characterized in that: A soft rock coring device is used, the soft rock coring device comprising a drill rod (10), a cover (20), a gas generator (30) and a rotary driver (70), the two ends of the drill rod (10) are connected, the two ends of the drill rod (10) are a connecting end (11) and a drill bit end (12), the rotary driver (70) comprises a rotating shaft (71) and a rotary joint (74), the connecting end (11) of the drill rod (10) can be installed on the rotating shaft (71), the rotating shaft (71) is provided with a center hole (73) connected to the inner cavity of the drill rod (10), the rotary joint (74) is rotatably connected to the outer periphery of the rotating shaft (71) and connected to the center hole (73), and the outer periphery of the rotary joint (74) is provided with a rotary interface (71). 5); the drill bit end (12) of the drill rod (10) is used to drill into soft rock (100) for coring; the cover body (20) is annular and sleeved on the outer periphery of the drill rod (10) so as to cover the outer gap (121) between the drill bit end (12) and the soft rock (100); a cover body interface (22) is provided outside the cover body (20); the cover body interface (22) is connected to an air outlet pipeline (60); the gas generator (30) is used to generate gas containing atomized water; the output end of the gas generator (30) is connected to a rotating interface (75) via an air inlet pipeline (40) so as to transport the gas containing atomized water into the drill rod (10); the gas containing atomized water is cooled through the drill bit end (12); The cover body (20) is further provided with a cover body interface 2 (24), the air intake pipeline (40) comprises a three-way valve 1 (401), the three-way valve 1 (401) has three connection ends, the three connection ends of the three-way valve 1 (401) are respectively connected to the output end of the gas generator (30), the rotary interface 1 (75) and the cover body interface 2 (24), and the three-way valve 1 (401) can control the output end of the gas generator (30) to be connected to the rotary interface 1 (75) or the cover body interface 2 (24); A second rotary interface (76) is arranged on the outer periphery of the rotary joint (74); the air outlet pipeline (60) comprises a second three-way valve (601); the second three-way valve (601) has three connection ends; the three connection ends of the second three-way valve (601) are respectively connected to the exhaust end (62) of the air outlet pipeline (60), the second rotary interface (76) and the first cover interface (22); the second three-way valve (601) can control the exhaust end (62) of the air outlet pipeline (60) to be connected to the first cover interface (22) or the second rotary interface (76); The three-way valve 1 (401) and the three-way valve 2 (601) have two states. In the first state, the three-way valve 1 (401) controls the output end of the gas generator (30) to be connected to the rotating interface 1 (75), and at the same time, the three-way valve 2 (601) controls the exhaust end (62) of the gas outlet pipeline (60) to be connected to the cover body interface 1 (22); In the second state, the three-way valve 1 (401) controls the output end of the gas generator (30) to be connected to the cover body interface 2 (24), and at the same time, the three-way valve 2 (601) controls the exhaust end (62) of the gas outlet pipeline (60) to be connected to the rotating interface 2 (76); During the coring process, the gas generator (30) generates gas carrying atomized water to cool the drill bit end (12) of the drill rod (10); in the early stage of coring, the drill bit end (12) of the drill rod (10) is operated in a first state to drill into the soft rock (100) and reach a preset depth; then, the drill bit end (12) of the drill rod (10) is operated in a second state to continuously cool the drill bit end (12) of the drill rod (10) until the drilling sampling is completed.

2. The soft rock coring method using high-speed atomized water cooling according to claim 1, characterized in that: The gas generator (30) comprises a high-pressure gas source (31), an atomizing humidifier (32) and a control valve (33); the high-pressure gas source (31) is used to output high-pressure gas; the atomizing humidifier (32) is used to atomize and humidify the output high-pressure gas; and the control valve (33) is used to control the on-off of the high-pressure gas; the air inlet pipeline (40) is installed with a temperature and humidity detector 1 (41), and the air outlet pipeline (60) is installed with a temperature and humidity detector 2 (61).

3. The soft rock coring method using high-speed atomized water cooling according to claim 1, characterized in that: The soft rock coring device further comprises a suction device (80) for applying negative pressure suction to the gas outlet pipeline (60).

4. The soft rock coring method using high-speed atomized water cooling according to claim 1, characterized in that: A sealing ring 1 (21) is installed on the side of the cover body (20) facing away from the soft rock (100), and the sealing ring 1 (21) is sleeved on the outer periphery of the drill rod (10) and is adapted to the outer diameter of the drill rod (10); a sealing ring 2 (23) is installed on the side of the cover body (20) facing the soft rock (100), and the sealing ring 2 (23) is used to abut against the surface of the soft rock (100).

5. The soft rock coring method using high-speed atomized water cooling according to claim 1, characterized in that: The soft rock coring device further comprises a spiral slag remover (50), wherein the spiral slag remover (50) has an air inlet (53), and the air outlet pipeline (60) is connected to the air inlet (53).

6. The soft rock coring method using high-speed atomized water cooling according to claim 5, characterized in that: The spiral slag remover (50) comprises a cylindrical shell (51) and a spiral blade (52), wherein the spiral blade (52) is located inside the cylindrical shell (51) and can be driven to rotate by a driver; the spiral blade (52) forms the inner cavity of the cylindrical shell (51) into a spiral chamber; the air inlet (53) is located at one end of the cylindrical shell (51), and the air outlet (54) is opened at the other end of the cylindrical shell (51).

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