Expanded soft rock coring equipment
By using a cooling tube to spray liquid cooling gas and protective covers in the expansion soft rock core collection equipment, the problems of expansion deformation and dust pollution of soft rock samples are solved, and the low temperature stability and environmental cleanliness of the core collection process are achieved, improving the quality of the core collection process. The accuracy of the experiment was achieved.
Patent Information
- Application Number
- CN202420060297.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-10
- Publication Date
- 2024-12-06
- Estimated Expiration
- 2034-01-10
AI Technical Summary
During the process of core extraction of expanded soft rocks, the soft rock samples will expand, deform or disintegrate when exposed to water, resulting in a decrease in the strength of the sample and affecting the accuracy of core extraction. In the prior art, the use of water to cool the hollow drill bits leads to dust pollution and cores. Performance damage.
An expanded soft rock core collection equipment is designed, and the hollow drill bit is cooled by spraying liquid cooling gas in the cooling tube, and dust pollution is avoided through protective covers and dust removal tubes to ensure the low temperature stability and environmental cleanliness of the core collection process.
Effectively reduce the temperature of the hollow drill bit to prevent damage to the core performance, improve the accuracy of core extraction and environmental cleanliness, and ensure the quality parameters of the core.
Smart Images
Figure CN222121464U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of expansion soft rock coring, and more specifically relates to expansion soft rock coring equipment. Background Art
[0002] Coring of expansive soft rock is the basis for conducting various rock physics and mechanics tests, and the quality of the core has a direct impact on the accuracy of the test. When drilling and coring expansive soft rock, the soft rock sample will undergo significant expansion and deformation or even collapse after encountering water, resulting in a significant reduction in the strength of the obtained sample, affecting the accuracy of coring. In the existing soft rock coring or cutting and sampling process, the hollow drill bit is cooled by water, which not only causes a large amount of dust pollution, but most importantly, it will cause the soft rock sample to be often in a wet state, resulting in softening and damage, affecting the performance of the core itself. Utility Model Content
[0003] The utility model aims to provide an expansion soft rock coring device, which can effectively reduce the temperature during the coring process, avoid affecting the performance of the core, facilitate ensuring the performance parameters of the core itself, and improve the accuracy of the test.
[0004] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide an expansion soft rock coring equipment, including a base, a protective cover, a drilling rig, a cooling pipe and a dust removal pipe, the base is used to place the soft rock sample, the protective cover is arranged above the base, the drilling rig is arranged above the base, the drilling rig has a drill rod extending downward into the protective cover and corresponding to the soft rock sample above and below, the lower end of the drill rod is provided with a hollow drill bit for drilling downward to obtain the sample, the cooling pipe extends into the protective cover, and is used to spray liquid cooling gas to the hollow drill bit to cool the hollow drill bit, and the dust removal pipe is connected to the protective cover, and is used to suck dust in the protective cover.
[0005] In one possible implementation, a cooling jacket is connected to the drilling rig and is sleeved on the outer periphery of the hollow drill bit. Sealing rings are respectively provided at the upper and lower ends of the cooling jacket. The inner wall of the cooling jacket, the sealing ring and the outer wall of the hollow drill bit form a cooling cavity connected to the cooling pipe. A plurality of through holes connected to the cooling cavity are provided on the outer peripheral wall of the hollow drill bit. The through holes are used to allow liquid cooling gas to enter the hollow drill bit.
[0006] In some embodiments, the lower portion of the hollow drill bit has an air outlet slit extending axially to the lower edge of the hollow drill bit, and a plurality of air outlet slits are provided at intervals along the circumference of the hollow drill bit.
[0007] In some embodiments, the expansion soft rock coring equipment includes a controller and a temperature sensor electrically connected to the controller. The temperature sensor is arranged on the lower end surface of the cooling jacket. The temperature sensor is used to monitor the temperature parameters of the lower end of the hollow drill bit and send the temperature parameters to the controller.
[0008] In some embodiments, the controller is electrically connected to a display, and the display is used to receive temperature parameters of the controller and display the temperature parameters.
[0009] In some embodiments, the air inlet end of the cooling tube is connected to a cooling gas bottle for containing liquid cooling gas, the liquid cooling gas is liquid carbon dioxide, and a pressure regulating valve electrically connected to the controller is provided on the cooling tube, and the controller is used to send a pressure regulating instruction to the pressure regulating valve.
[0010] In one possible implementation, the cooling pipe includes an inner pipe, an insulation layer and a pressure protection layer. The insulation layer is sleeved on the outer periphery of the inner pipe, and the pressure protection layer is sleeved on the outer periphery of the insulation layer. The thickness of the insulation layer is greater than the thickness of the inner pipe.
[0011] In one possible implementation, the drilling rig includes a column, a longitudinal drive member, a machine base and a rotating drive member. The column is connected to the top of the base, the machine base is slidably connected to the column and can move up and down driven by the longitudinal drive member, and the hollow drill bit is connected to the machine base and can move up and down with the machine base and rotate under the drive of the rotating drive member.
[0012] In a possible implementation, a noise reduction and sound absorption layer is provided on the inner wall of the protective cover, and the thickness of the noise reduction and sound absorption layer is greater than the thickness of the protective cover.
[0013] In one possible implementation, a dust collector is connected to the dust removal pipe, and a dust removal fan and a filter screen for filtering dust are provided in the dust collector. The dust removal fan is located on the side of the filter screen away from the protective cover, and the side of the filter screen adjacent to the dust removal fan gradually extends outward and upward.
[0014] Compared with the prior art, the solution shown in the embodiment of the present application is an expansion soft rock coring equipment provided by the embodiment of the present application, which utilizes a cooling pipe to transport liquid cooling gas into the protective cover, and utilizes low-temperature gas to achieve effective cooling of the hollow drill bit. The provision of the protective cover can avoid dust pollution caused by the drilling and coring process, facilitates the collection of dust through the dust removal pipe, avoids pollution to the environment, ensures the smooth progress of the coring operation, avoids affecting the performance of the core, and ensures the accuracy of the test. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0016] Figure 1A schematic diagram of a partial cross-sectional structure of a front view of an expansion soft rock coring device provided in an embodiment of the utility model;
[0017] Figure 2 For the utility model embodiment Figure 1 A schematic diagram of the main cross-sectional structure of the middle drill rod, hollow drill bit, cooling jacket and cooling tube;
[0018] Figure 3 For the utility model embodiment Figure 1 A schematic diagram of the structure of the hollow drill bit viewed from above;
[0019] Figure 4 For the utility model embodiment Figure 1 A schematic diagram of the cross-sectional structure of the middle cooling tube;
[0020] Figure 5 For the utility model embodiment Figure 1 Schematic diagram of the main cross-sectional structure of the middle dust collector and the dust removal pipe.
[0021] Among them, the reference numerals in the figure are:
[0022] 1. Base; 11. Drill rod; 12. Hollow drill bit; 13. Through hole; 14. Air outlet; 2. Protective cover; 3. Drilling rig; 31. Column; 32. Longitudinal drive member; 33. Machine base; 34. Rotary drive member; 4. Cooling pipe; 41. Inner pipe; 42. Insulation layer; 43. Pressure protection layer; 5. Dust removal pipe; 51. Dust collector; 52. Filter; 53. Dust removal fan; 6. Cooling jacket; 61. Sealing ring; 62. Cooling chamber; 7. Temperature sensor; 8. Display; 9. Cooling gas bottle; 91. Pressure regulating valve. DETAILED DESCRIPTION
[0023] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.
[0024] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or indirectly on the other element. It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "back", "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. The terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.
[0025] Please also read Figures 1 to 5 , the expansion soft rock coring equipment provided by the utility model is now described. The expansion soft rock coring equipment includes a base 1, a protective cover 2, a drill rig 3, a cooling pipe 4 and a dust removal pipe 5. The base 1 is used to place the soft rock sample. The protective cover 2 is arranged above the base 1. The drill rig 3 is arranged above the base 1. The drill rig 3 has a drill rod 11 extending downward into the protective cover 2 and corresponding to the soft rock sample above and below. The lower end of the drill rod 11 is provided with a hollow drill bit 12 for drilling downward to obtain the sample. The cooling pipe 4 extends into the protective cover 2 and is used to spray liquid cooling gas to the hollow drill bit 12 to cool the hollow drill bit 12. The dust removal pipe 5 is connected to the protective cover 2 and is used to suck the dust in the protective cover 2.
[0026] Compared with the prior art, the expansion soft rock coring equipment provided in the present embodiment uses a cooling pipe 4 to transport liquid cooling gas into the protective cover 2, and uses low-temperature gas to effectively cool the hollow drill bit 12. The setting of the protective cover 2 can avoid dust pollution caused by the drilling and coring process, facilitate the collection of dust through the dust removal pipe 5, avoid pollution to the environment, ensure the smooth progress of the coring operation, avoid affecting the performance of the core, and ensure the accuracy of the test.
[0027] Swelling soft rock has strong water absorption and swelling properties, and is prone to swelling and deformation. When operators bring soft rock samples from the outside to the laboratory, they need to drill holes and coring the soft rock samples to obtain rock cores, and then use the rock cores for related experiments.
[0028] In this embodiment, since the hollow drill bit 12 generates a large amount of heat during the drilling process, when the liquid cooling gas is used for cooling, the temperature of the hollow drill bit 12 should be accurately controlled to keep it within the range of 5°C to 35°C to prevent the temperature from being too high or too low. Too high a temperature will cause the core to overheat and cause changes in its internal moisture, causing the soft rock sample to crack. Too low a temperature (such as below 0 degrees) will cause the moisture in the soft rock sample to freeze, causing the soft rock sample to expand and be damaged.
[0029] Liquid cooling gas may be inert gas such as liquid nitrogen or liquid carbon dioxide, which can achieve cooling effect on the hollow drill bit 12. When drilling and coring expansion soft rock, it is necessary to maintain a stable temperature range to avoid affecting the soft rock sample.
[0030] As a specific embodiment, liquid carbon dioxide is selected as the liquid cooling gas because its melting point is about -40°C and it has a good cooling effect. At the same time, it is cheap.
[0031] The protective cover 2 and the dust collector 51 are used in combination to facilitate dust collection. At the same time, the protective cover 2 also has a good protective effect to prevent the splashing of soft rock samples from causing safety problems to operators.
[0032] In a possible implementation, please also see Figures 1 to 5 A cooling jacket 6 is connected to the drilling rig 3 and is sleeved on the outer periphery of the hollow drill bit 12. Sealing rings 61 are respectively provided at the upper and lower ends of the cooling jacket 6. The inner wall of the cooling jacket 6, the sealing ring 61 and the outer wall of the hollow drill bit 12 form a cooling cavity 62 connected to the cooling pipe 4. A plurality of through holes 13 connected to the cooling cavity 62 are provided on the outer peripheral wall of the hollow drill bit 12. The through holes 13 are used to allow liquid cooling gas to enter the hollow drill bit 12.
[0033] In this embodiment, a cooling jacket 6 is provided on the drilling rig 3 for conveying the liquid cooling gas in the cooling pipe 4 to the hollow interior of the drill bit, so that the hollow drill bit 12 can be effectively cooled.
[0034] Specifically, the cooling sleeve 6 is arranged on the outer periphery of the hollow drill bit 12, and two sealing rings 61 are arranged between the outer peripheral wall of the hollow drill bit 12. The two sealing rings 61 are respectively arranged close to the upper end face and the lower end face of the cooling sleeve 6, and have good sealing performance between the outer peripheral wall of the hollow drill bit 12.
[0035] Two sealing rings 61 form a cooling chamber 62 for accommodating liquid cooling gas between the cooling sleeve 6 and the hollow drill bit 12. The cooling pipe 4 passes through the peripheral wall of the cooling sleeve 6 and is connected to the cooling chamber 62. The through hole 13 on the outer peripheral wall of the hollow drill bit 12 allows the liquid cooling gas to smoothly enter the hollow drill bit 12, thereby achieving effective cooling of the hollow drill bit 12 and cooling the hollow drill bit 12, so that the soft rock sample is kept in the range of 5-35°C to avoid affecting the core.
[0036] In some embodiments, please refer to Figures 1 to 5 The lower part of the hollow drill bit 12 has an air outlet slit 14 extending axially to the lower edge of the hollow drill bit 12 , and a plurality of air outlet slits 14 are arranged at intervals along the circumference of the hollow drill bit 12 .
[0037] In this embodiment, the liquid cooling gas is cooled down after entering the hollow drill bit 12, and is gasified into gas at the same time. The gas outlet slit 14 provided at the lower part of the hollow drill bit 12 allows the gas to be discharged smoothly. The width of the gas outlet slit 14 can be set to 1-1.5 mm, which not only meets the gas discharge requirements, but also avoids the waste of gas caused by too large a width, thereby ensuring the cooling effect on the lower end of the hollow drill bit 12.
[0038] Specifically, a plurality of gas outlet slits 14 are provided, so that the gas can be evenly distributed around the hollow drill bit 12, thereby achieving uniform cooling of the hollow drill bit 12. The gas outlet slits 14 extend to the lower edge of the hollow drill bit 12, and can effectively cool the contact portion between the hollow drill bit 12 and the soft rock sample, thereby ensuring the quality of the core.
[0039] Furthermore, since the strength of the expanded soft rock is generally not high, most of them are lower than 30 MPa (if it is higher than 30 MPa, the core can be prepared by conventional methods). Therefore, the thickness of the hollow drill bit 12 is set to 1-2 mm. The above thickness value is convenient for drilling operation, which can effectively reduce the wear of the soft rock sample, reduce the vibration and damage to the soft rock sample, increase the drilling rate, reduce the time of drilling and coring, and improve the efficiency of sample preparation.
[0040] In some embodiments, please refer to Figures 1 to 5 The expansion soft rock coring equipment includes a controller and a temperature sensor 7 electrically connected to the controller. The temperature sensor 7 is arranged on the lower end surface of the cooling sleeve 6. The temperature sensor 7 is used to monitor the temperature parameters of the lower end of the hollow drill bit 12 and send the temperature parameters to the controller.
[0041] In this embodiment, during the drilling process of the hollow drill bit 12, it is necessary to focus on controlling the drilling temperature. The temperature sensor 7 is provided to facilitate monitoring the temperature of the hollow drill bit 12 and transmit the temperature parameter to the controller. When the temperature is higher or lower than the set temperature range, it can be adjusted by adjusting the supply speed of the cooling gas, the rotation speed of the hollow drill bit 12, or adjusting the drilling speed of the hollow drill bit 12, so that the actual temperature of the hollow drill bit 12 is within the set temperature range to avoid affecting the core.
[0042] The pressure and speed of the liquid cooling gas delivery, the drilling speed and rotation speed of the hollow drill bit 12 and other parameters should be determined according to the lithology, strength and other parameters of the soft rock sample. At the same time, the temperature of the soft rock sample should be within a suitable range to avoid affecting the performance of the core itself.
[0043] In some embodiments, please refer to Figures 1 to 5 The controller is electrically connected to a display 8, which is used to receive the temperature parameters of the controller and display the temperature parameters. The display 8 is set to facilitate operators to observe and understand the temperature parameters in a timely manner and facilitate operators to perform adjustment operations.
[0044] In some embodiments, please refer to Figures 1 to 5 The air inlet end of the cooling tube 4 is connected to a cooling gas bottle 9 for containing liquid cooling gas, the liquid cooling gas is liquid carbon dioxide, and a pressure regulating valve 91 electrically connected to the controller is provided on the cooling tube 4, and the controller is used to send a pressure regulating instruction to the pressure regulating valve 91.
[0045] In this embodiment, the cooling pipe 4 is connected to the cooling gas bottle 9, and the cooling gas bottle 9 contains liquid cooling gas. The pressure regulating valve 91 arranged on the cooling pipe 4 can adjust the supply flow of the cooler gas to the hollow drill bit 12.
[0046] The pressure regulating valve 91 can receive the pressure regulating instruction from the controller, drive the valve to change the cross-sectional area between the valve core and the valve seat, control the process parameters such as the flow rate, temperature and pressure of the liquid cooling gas in the cooling pipe 4, and realize the automatic regulation of the liquid cooler supply flow rate.
[0047] Specifically, after receiving the temperature parameters sent by the temperature sensor 7, the controller makes a judgment according to the preset program. When the temperature parameters are higher than the standard temperature range in the preset program, the controller sends a pressure regulating instruction to the pressure regulating valve 91 to reduce the supply flow rate; when the temperature parameters are lower than the standard temperature range in the preset program, the controller sends a pressure regulating instruction to the pressure regulating valve 91 to increase the supply flow rate.
[0048] In a possible implementation, please also see Figures 1 to 5The cooling tube 4 includes an inner tube 41, an insulation layer 42 and a pressure protection layer 43. The insulation layer 42 is sleeved on the outer periphery of the inner tube 41, and the pressure protection layer 43 is sleeved on the outer periphery of the insulation layer 42. The thickness of the insulation layer 42 is greater than that of the inner tube 41.
[0049] In this embodiment, the liquid carbon dioxide is in liquid form in the cooling gas bottle 9, and its temperature is generally lower than -40°C. As the liquid carbon dioxide is transmitted in the cooling tube 4, its temperature gradually increases due to the influence of the ambient temperature. In order to avoid a sharp increase in its temperature during the transmission process, the cooling tube 4 needs to be structurally designed.
[0050] The inner tube 41 is provided with an insulation layer 42 on its outer periphery, which can prevent the rapid increase of the temperature of the liquid carbon dioxide and ensure the cooling effect when it reaches the hollow drill bit 12. Specifically, the insulation layer 42 is used to isolate the inside of the cooling tube 4 from the external ambient air, and its thickness is greater than that of the inner tube 41, and has good thermal insulation performance.
[0051] At the same time, since the liquid carbon dioxide has a certain pressure when it just comes out of the cooling gas bottle 9, in order to increase the safety during transportation and prevent the pipeline from bursting, a pressure protection layer 43 is set outside the insulation layer 42 to achieve good explosion-proof performance.
[0052] In a possible implementation, please also see Figures 1 to 5 The drilling rig 3 includes a column 31, a longitudinal driving member 32, a machine base 33 and a rotating driving member 34. The column 31 is connected above the base 1. The machine base 33 is slidably connected to the column 31 and can move up and down driven by the longitudinal driving member 32. The hollow drill bit 12 is connected to the machine base 33, can move up and down with the machine base 33, and rotate under the drive of the rotating driving member 34.
[0053] In this embodiment, the drilling rig 3 has dual actions of circumferential rotation and up and down movement. The longitudinal driving member 32 is used to drive the machine base 33 to move up and down along the column 31 to achieve longitudinal drilling of the hollow drill bit 12. The rotating driving member 34 arranged on the machine base 33 can drive the hollow rotary head to rotate circumferentially to achieve the cutting effect on the soft rock sample. Combined with the longitudinal downward movement of the hollow drill bit 12, a cylindrical rock core can be formed inside the hollow drill bit 12.
[0054] In a possible implementation, please also see Figures 1 to 5, a noise reduction and sound absorption layer is provided on the inner wall of the protective cover 2, and the thickness of the noise reduction and sound absorption layer is greater than the thickness of the protective cover 2. The protective cover 2 can effectively seal the drilling and coring area to prevent dust dispersion during the drilling process. The dust removal pipe 5 can remove dust and collect it centrally to avoid pollution to the environment. The noise reduction and sound absorption layer can be made of flexible materials such as rubber and silicone, which has good sound absorption and protection performance, and can effectively prevent the noise generated during the drilling process of the hollow drill bit 12 from affecting the external environment.
[0055] In a possible implementation, please also see Figures 1 to 5 A dust collector 51 is connected to the dust removal pipe 5, and a dust removal fan 53 and a filter screen 52 for filtering dust are arranged in the dust collector 51. The dust removal fan 53 is located on the side of the filter screen 52 away from the protective cover 2, and the side of the filter screen 52 adjacent to the dust removal fan 53 gradually extends outward and upward.
[0056] In this embodiment, the dust removal fan 53 can form a suction effect on the gas in the protective cover 2, and effectively filter the dust using the filter 52. The filter 52 is extended in an inclined manner, which can effectively intercept the dust and make the dust gather downward along the inclined surface of the filter 52, so as to effectively collect the dust particles, and the filtered gas is discharged into the external air, which has a good filtering effect.
[0057] The above-mentioned expansion soft rock coring equipment uses the cooling pipe 4 to transport liquid cooling gas into the protective cover 2, and uses low-temperature gas to effectively cool the hollow drill bit 12, avoiding the use of cooling water. The setting of the protective cover 2 can avoid dust pollution caused by the drilling and coring process, facilitate the collection of dust through the dust removal pipe 5, avoid pollution to the environment, ensure the smooth progress of the coring operation, avoid affecting the performance of the core, and ensure the accuracy of the test.
[0058] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. Expansion soft rock coring equipment, characterized in that: The invention comprises a base (1), a protective cover (2), a drilling rig (3), a cooling pipe (4) and a dust removal pipe (5), wherein the base (1) is used to place a soft rock sample, the protective cover (2) is arranged above the base (1), the drilling rig (3) is arranged above the base (1), the drilling rig (3) has a drill rod (11) extending downward into the protective cover (2) and corresponding to the soft rock sample above and below, the lower end of the drill rod (11) is provided with a hollow drill bit (12) for drilling downward to obtain a sample, the cooling pipe (4) extends into the protective cover (2) and is used to spray liquid cooling gas to the hollow drill bit (12) to cool the hollow drill bit (12), and the dust removal pipe (5) is connected to the protective cover (2) and is used to suck dust in the protective cover (2).
2. The expansion soft rock coring equipment according to claim 1, characterized in that: The drilling rig (3) is connected to a cooling jacket (6) which is sleeved on the outer periphery of the hollow drill bit (12); sealing rings (61) are respectively provided at the upper and lower ends of the cooling jacket (6); the inner wall of the cooling jacket (6), the two sealing rings (61) and the outer wall of the hollow drill bit (12) form a cooling cavity (62) which is connected to the cooling pipe (4); a plurality of through holes (13) which are connected to the cooling cavity (62) are provided on the outer peripheral wall of the hollow drill bit (12); the through holes (13) are used to allow the liquid cooling gas to enter the hollow drill bit (12).
3. The expansion soft rock coring equipment according to claim 2, characterized in that: The lower part of the hollow drill bit (12) has an air outlet slit (14) extending axially to the lower edge of the hollow drill bit (12), and a plurality of the air outlet slits (14) are arranged at intervals along the circumference of the hollow drill bit (12).
4. The expansion soft rock coring equipment according to claim 2, characterized in that: The expansion soft rock coring equipment comprises a controller and a temperature sensor (7) electrically connected to the controller, wherein the temperature sensor (7) is arranged on the lower end surface of the cooling jacket (6), and the temperature sensor (7) is used to monitor the temperature parameters of the lower end of the hollow drill bit (12) and send the temperature parameters to the controller.
5. The expansion soft rock coring equipment according to claim 4, characterized in that: The controller is electrically connected to a display (8), and the display (8) is used to receive the temperature parameter of the controller and display the temperature parameter.
6. The expansion soft rock coring equipment according to claim 4, characterized in that: The air inlet end of the cooling tube (4) is connected to a cooling gas bottle (9) for containing liquid cooling gas, wherein the liquid cooling gas is liquid carbon dioxide, and the cooling tube (4) is provided with a pressure regulating valve (91) electrically connected to the controller, and the controller is used to send a pressure regulating instruction to the pressure regulating valve (91).
7. The expansion soft rock coring equipment according to claim 1, characterized in that: The cooling pipe (4) comprises an inner layer pipe (41), a heat-insulating layer (42) and a pressure protection layer (43); the heat-insulating layer (42) is sleeved on the outer periphery of the inner layer pipe (41); the pressure protection layer (43) is sleeved on the outer periphery of the heat-insulating layer (42); the thickness of the heat-insulating layer (42) is greater than the thickness of the inner layer pipe (41).
8. The expansion soft rock coring equipment according to claim 1, characterized in that: The drilling machine (3) comprises a column (31), a longitudinal driving member (32), a machine base (33) and a rotating driving member (34); the column (31) is connected above the base (1); the machine base (33) is slidably connected to the column (31) and can move up and down driven by the longitudinal driving member (32); the hollow drill bit (12) is connected to the machine base (33) and can move up and down with the machine base (33) and rotate under the drive of the rotating driving member (34).
9. The expansion soft rock coring equipment according to claim 1, characterized in that: A noise reduction and sound absorption layer is provided on the inner wall of the protective cover (2), and the thickness of the noise reduction and sound absorption layer is greater than the thickness of the protective cover (2).
10. The expansion soft rock coring equipment according to claim 1, characterized in that: The dust removal pipe (5) is connected to a dust collector (51), and a dust removal fan (53) and a filter screen (52) for filtering dust are arranged in the dust collector (51). The dust removal fan (53) is located on a side of the filter screen (52) away from the protective cover (2), and a side of the filter screen (52) adjacent to the dust removal fan (53) gradually extends outward and upward.