Rock core drilling device
By controlling the medium channel and cutting tools of the core drilling device, the problem of cutting core samples under different rock mass lithologies was solved, improving cutting efficiency and data acquisition accuracy.
Patent Information
- Application Number
- CN202520200432.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-08
- Publication Date
- 2025-12-19
- Estimated Expiration
- 2035-02-08
AI Technical Summary
Existing drill bits are insufficient to meet the sampling requirements of different rock types, and breaking rock core samples may cause sample damage or reduce data acquisition accuracy.
The core drilling device includes a core sleeve, a hollow drill bit, a media channel, and a cutting tool. The extension and retraction of the cutting tool is controlled by hydraulic media to accurately cut the core sample and reduce mechanical interference.
It improves the cutting efficiency and cross-sectional quality of rock core samples, ensures the accuracy and reliability of rock mass data acquisition, and is adaptable to rock masses with different lithologies.
Smart Images
Figure CN223689658U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of rock mass mechanics test equipment, and particularly relates to a rock core drilling device. BACKGROUND
[0002] The core hole wall stress relief technology is an advanced method for accurately measuring the ground stress distribution in underground engineering; the core principle of the technology is to drill a small hole in the rock mass to be measured for installing a strain measurement device, and then drill a larger hole at the same center position, so that the rock core sample with the strain measurement device is separated from the rock mass; when the rock core sample is removed from its original stress environment, the small hole sidewall will have a strain recovery phenomenon due to the disappearance of the constraint, and the strain change of the process is recorded by using the strain measurement device, and the ground stress state at the position of the rock core sample is accurately determined by combining the elastic theory analysis.
[0003] In actual operation, an open hole drill bit is usually used to obtain a rock core sample, and the rock core sample is twisted off from the rock mass by using the torque in the rotation process of the open hole drill bit, so as to smoothly take out the rock core sample; due to the large difference in lithology of different rock masses, the open hole drill bit is difficult to meet the sampling needs of different types of rock masses, and the twist-off method for disconnecting the rock core sample may also interfere with the rock core sample, affecting the data collection accuracy of the rock mass. CONTENT OF THE INVENTION
[0004] Therefore, the present application aims to provide a rock core drilling device to solve the above-mentioned technical problems.
[0005] In order to achieve the above purpose, the present application provides a rock core drilling device, which comprises:
[0006] A rock core sleeve is provided with a drilling cavity inside;
[0007] A hollow drill bit is fixedly connected to one end of the rock core sleeve and is in communication with the drilling cavity;
[0008] A medium channel is arranged in the side wall of the rock core sleeve to accommodate hydraulic medium;
[0009] A cutting tool is arranged in the accommodation groove in the inner side wall of the rock core sleeve in communication with the medium channel; by changing the flow direction of the hydraulic medium between the medium channel and the accommodation groove, the cutting tool is driven to extend into the drilling cavity or retract into the accommodation groove.
[0010] From the above, it can be seen that the core drilling device provided by the application can transport hydraulic medium to the accommodation groove through the medium channel when the core sample is obtained, so as to accurately control the cutting tool to cut into the core sample through the hydraulic medium, and the cutting tool is used to cut the core sample during the rotation of the core drilling device, which is beneficial to improve the cutting efficiency of the core sample and the quality of the formed section, reduce the mechanical interference of the core sleeve on the core sample, guarantee the accuracy and reliability of the data collection of the rock mass, and enable the core drilling device to cope with different lithological rock masses and improve the quality of the obtained core sample. BRIEF DESCRIPTION OF DRAWINGS
[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.
[0012] Figure 1 is a schematic view of the core drilling device in the first state in the present application;
[0013] Figure 2 is a schematic view of the core drilling device in the first state in the present application;
[0014] Figure 3 is a partial sectional view of the core drilling device in the present application;
[0015] Figure 4 is a working state schematic view of the core drilling device in the present application.
[0016] BRIEF DESCRIPTION OF DRAWINGS
[0017] 1, core sleeve; 101, drilling cavity; 102, accommodation groove; 1021, limiting part; 103, expansion part; 1031, chip removal channel; 104, first on-off valve; 105, second on-off valve;
[0018] 2, hollow drill bit;
[0019] 3, medium channel; 301, bending part;
[0020] 4, cutting tool; 410, piston block; 420, tool body;
[0021] 5, screwing assembly; 510, fixed plate; 520, driving rod; 530, plugging block; 540, support column;
[0022] 6, medium distribution cavity;
[0023] 7. Hydraulic device
[0024] 8. Catheter. DETAILED DESCRIPTION
[0025] For the purpose of making the objects, technical solutions and advantages of the present application clearer, further detailed description will be made to the present application with reference to the specific embodiments and the accompanying drawings.
[0026] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be understood as the common meanings understood by those with ordinary skills in the art to which the present application belongs. The terms "first", "second" and similar terms used in the present application do not represent any order, number or importance, but are only used to distinguish different components. The terms "include", "contain" and similar terms mean that the components or objects before the terms cover the components or objects listed after the terms and their equivalents, without excluding other components or objects. The terms "connect" or "connected" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right" and the like are only used to represent relative positional relationships, which may change accordingly when the absolute positions of the described objects change.
[0027] The core of the sleeve hole wall stress relief technology is to drill two holes in the rock mass to be measured: specifically, first, a small hole is drilled at the measurement location to install a precise strain measurement device; then a larger diameter annular hole is drilled at the same center position, so that the core sample with the strain measurement device is completely separated from the surrounding rock mass; when the core sample is removed from the original stress environment, the small hole sidewall will experience strain recovery due to the disappearance of external constraints, i.e. the core sample will try to recover to the state without external stress; during this process, the subtle deformation of the core sample will be recorded by the strain measurement device pre-installed inside the core sample, and by combining the elastic theory in rock mechanics, the strain data can be analyzed to accurately infer the in-situ stress state of the core location, as well as the direction and size of the principal stress and other key information.
[0028] In actual operation, in order to ensure that the core can be smoothly taken out, an open hole drill bit is usually used to drill and cut the core sample from the rock mass to be measured, and then the torque generated by the open hole drill bit during rotation is used to break the core sample from the rock mass. However, the rock mass characteristics (such as hardness, brittleness, bedding, etc.) of different types of rock masses differ significantly, which poses certain challenges to the acquisition of core samples.
[0029] Exemplarily, for the rock mass with greater brittleness, after cutting out the rock core on the rock mass, the torque generated when the rock core sample is broken is difficult to control, which is easy to cause the rock core sample to be loose or broken, thereby affecting the integrity of the rock core sample and the accuracy of data acquisition; and for the rock mass with greater hardness, the torque generated by the original hole drilling bit is difficult to break the rock core sample, and if the torque generated by the impact method is used to break the rock core sample, the violent operation may introduce additional stress and cause damage to the rock core sample, interfere with the strain recovery process detected by the strain measuring device, and finally affect the accuracy and reliability of the in-situ stress data.
[0030] Therefore, the original hole drilling bit is difficult to meet the breaking needs of different types of rock masses, and the force generated in the process of breaking the rock core may interfere with or damage the rock core sample, thereby affecting the accuracy of rock mass data acquisition; that is, the hole drilling bit has poor adaptability to diversified lithology, which may cause the rock core sample to be damaged or deformed, and cannot accurately reflect the original in-situ stress state.
[0031] Therefore, the original hole drilling bit is difficult to meet the breaking needs of different types of rock masses, and the force generated in the process of breaking the rock core may interfere with or damage the rock core sample, thereby affecting the accuracy of rock mass data acquisition; that is, the hole drilling bit has poor adaptability to diversified lithology, which may cause the rock core sample to be damaged or deformed, and cannot accurately reflect the original in-situ stress state.
[0031] In view of this, the present application provides a rock core drilling device, which comprises a rock core sleeve 1, a hollow drill bit 2, a medium channel 3 and a cutting tool 4; the rock core sleeve 1 is provided with a drilling cavity 101; the hollow drill bit 2 is fixedly connected with one end of the rock core sleeve 1 and communicates with the drilling cavity 101; the medium channel 3 is arranged in the side wall of the rock core sleeve 1 and is used to accommodate hydraulic medium; the inner side wall of the rock core sleeve 1 is provided with a containing groove 102 which communicates with the medium channel 3, and the cutting tool 4 is slidingly arranged in the containing groove 102; by changing the flow direction of the hydraulic medium between the medium channel 3 and the containing groove 102, the cutting tool 4 is driven to extend into the drilling cavity 101 or retract into the containing groove 102.
[0032] Specifically, please refer to Figures 1-4 ; wherein, Figure 1 is a schematic view of the rock core drilling device in the first state in the present application, Figure 2 is a schematic view of the rock core drilling device in the first state in the present application, Figure 3 is a partial sectional view of the rock core drilling device in the present application, Figure 4 is a working state schematic view of the rock core drilling device in the present application.
[0033] The present application provides a rock core drilling device, such as Figures 1-4As shown, the core drilling device includes a core sleeve 1 and a hollow drill bit 2. The core sleeve 1 is internally provided with a drilling cavity 101. When the core sleeve 1 is screwed into the rock mass and cuts out the core sample, the core sample can enter the core sleeve 1 and be stored through the drilling cavity 101. The hollow drill bit 2 is a hollow structure and is fixedly connected with the core sleeve 1. Therefore, the hollow drill bit 2 can advance into the rock mass together with the core sleeve 1, cut out a ring-shaped borehole in the rock mass by using the hollow drill bit 2, and form a columnar core sample in the ring-shaped borehole. Since the hollow drill bit 2 is communicated with the drilling cavity 101, as the hollow drill bit 2 continuously advances, the core sample can pass through the hollow drill bit 2 and enter the inside of the drilling cavity 101, so that the core sample can be taken out together with the core drilling device in the later stage.
[0034] Exemplarily, the hollow drill bit 2 can be formed of high-strength materials such as cemented carbide and diamond, so that the hollow drill bit 2 has good mechanical strength, wear resistance and heat resistance, and can be suitable for rock masses of different lithology, thereby prolonging the service life. In addition, the side of the hollow drill bit 2 away from the core sleeve 1 can be provided with an inclined surface, which can increase the contact area between the hollow drill bit 2 and the rock mass, and improve the cutting effect on the rock mass. Details are not described herein.
[0035] The core drilling device provided by the application further includes a medium channel 3 and a cutting tool 4 for cutting the core sample, so as to obtain a core with good quality in the rock mass. The medium channel 3 is arranged in the side wall of the core sleeve 1 and is used to accommodate and transport hydraulic medium. The inner side wall surface of the core sleeve 1 is recessed and provided with a receiving groove 102 communicated with the medium channel 3, so that the hydraulic medium can flow between the medium channel 3 and the receiving groove 102. The cutting tool 4 is slidingly arranged in the receiving groove 102. Since the medium channel 3 and the receiving groove 102 are communicated, the hydraulic medium can flow between the medium channel 3 and the receiving groove 102. The position of the cutting tool 4 in the receiving groove 102 can be adjusted by the content of the hydraulic medium in the receiving groove 102. That is, by changing the flow direction of the hydraulic medium between the medium channel 3 and the receiving groove 102, the cutting tool 4 can be driven to extend into the drilling cavity 101 or retract into the receiving groove 102.
[0036] Exemplarily, when the core drilling device is used to cut the core sample, the hydraulic medium in the receiving groove 102 can flow into the medium channel 3, so as to reduce the content of the hydraulic medium in the receiving groove 102 and lower the liquid pressure in the receiving groove 102. As the liquid pressure in the receiving groove 102 decreases, the cutting tool 4 will retract from the drilling cavity 101 into the receiving groove 102, so as to avoid damage to the core sample caused by the cutting tool 4 during the preparation of the core sample by using the core drilling device.
[0037] Exemplarily, when the rock core drilling device cuts the rock sample core, the hydraulic medium can be transported into the accommodation groove 102 through the medium channel 3, the content of the hydraulic medium in the accommodation groove 102 is increased, and the liquid pressure in the accommodation groove 102 is increased. As the liquid pressure in the accommodation groove 102 rises, the hydraulic medium can push the cutting tool 4 to extend from the accommodation groove 102 into the drilling cavity 101. Since the rock core sample is located in the drilling cavity 101, the cutting tool 4 can cut into the rock core sample under the action of the hydraulic medium. When the cutting tool 4 extends to a specified length, the rock core drilling device can be controlled to rotate in place, so that the cutting tool 4 cuts a ring-shaped cutting groove around the rock core sample to at least partially or completely cut the rock core, thereby forming a flat cross section at the end of the rock core sample. Compared with twisting the rock core by torque, the cutting speed of the rock core drilling device is faster, the number of rotations is relatively small, the torque applied to the rock core sample is low, and the damage to the rock core sample and the degree of interference are relatively small. Therefore, the rock core drilling device can be used for rock bodies of different lithology.
[0038] Exemplarily, the hydraulic medium can be a liquid such as hydraulic oil with stable properties, so as to ensure the adjustment accuracy of the cutting tool 4. Details are not described herein.
[0039] It should be noted that when the hydraulic medium is used to adjust the extension device of the cutting tool 4, the rock core drilling device can be stopped from rotating, and the hydraulic device 7 can be used to adjust the hydraulic content in the medium channel 3 and the accommodation groove 102. Figure 4 As shown, when the rock core drilling device cuts the rock core sample, the conduit 8 can be connected with the hydraulic device 7, and the hydraulic device 7 can be used to pump out the hydraulic medium in the medium channel 3 and the accommodation groove 102, so that the hydraulic medium in the accommodation groove 102 flows into the medium channel 3, and the internal liquid pressure is reduced. When the rock core drilling device cuts the rock sample core, the hydraulic device 7 is used to transport the hydraulic medium into the medium channel 3 and the accommodation groove 102, so that the hydraulic medium flows from the medium channel 3 into the accommodation groove 102, and the internal liquid pressure is increased. Details are not described herein.
[0040] The rock core drilling device integrates the medium channel 3 and the cutting tool 4 in the side wall of the rock core sleeve 1. When the rock core sample is obtained, the hydraulic medium can be transported into the accommodation groove 102 through the medium channel 3, so as to accurately control the cutting tool 4 to cut into the rock core sample by the hydraulic medium. During the rotation of the rock core drilling device, the cutting tool 4 can cut the rock core sample, which is beneficial to improve the cutting efficiency of the rock core sample and the quality of the cross section, reduce the mechanical interference of the rock core sleeve 1 to the rock core sample, ensure the accuracy and reliability of the data collection of the rock mass, and enable the rock core drilling device to cope with rock bodies of different lithology and improve the quality of the obtained rock core sample.
[0041] In some embodiments, the cutting tool 4 comprises a piston block 410 and a tool body 420; the piston block 410 is slidingly arranged in the accommodating groove 102 and is adapted to the accommodating groove 102; the tool body 420 is fixedly connected to the side of the piston block 410 away from the port of the medium passage 3.
[0042] For the cutting tool, after the core sample is cut by the core drilling device, the cutting tool 4 can be extended into the drilling cavity 101 and cut into the core sample, the cutting tool 4 is driven by the rotating core sleeve 1 to cut the core sample, so as to obtain a core sample with better quality; as shown in the figure, the cutting tool 4 comprises a piston block 410 and a tool body 420, the piston block 410 is slidingly arranged in the accommodating groove 102 and is adapted to the accommodating groove 102, which provides a mounting position for the tool body 420, and can ensure the sealing between the piston block 410 and the side wall of the accommodating groove 102, so as to drive the piston block 410 to move by adjusting the liquid pressure in the accommodating groove 102, and to control the extension and retraction state of the tool body 420. Figures 1-3
[0043] In some embodiments, the side wall of the accommodating groove 102 is protrudingly provided with a limiting portion 1021, and the limiting portion 1021 is located on the side of the piston block 410 away from the port of the medium passage 3.
[0044] For the cutting tool 4, when the medium passage 3 delivers hydraulic medium to the accommodating groove 102, the liquid pressure of the hydraulic medium can push the cutting tool 4 to move away from the port of the medium passage 3, that is, the tool body 420 of the cutting tool 4 extends into the drilling cavity 101 and cuts into the core sample, so that the core sample can be cut when the core drilling device rotates; as shown in the figure, by protruding the side wall of the accommodating groove 102 to form the limiting portion 1021, and arranging the limiting portion 1021 on the side of the piston block 410 away from the end of the medium passage 3, the stroke of the piston block 410 in the cutting tool 4 can be limited, so that the piston block 410 of the cutting tool 4 does not come out of the accommodating groove 102 when the cutting tool 4 slides towards the drilling cavity 101. Figures 1-4
[0045] Exemplarily, in order to protrude the limiting portion 1021 on the side wall of the accommodating groove 102, the limiting portion 1021 can be integrally formed with the core sleeve 1, which will not be described here.
[0046] In some embodiments, the core drilling device further comprises a screwing assembly 5, which comprises a fixing plate 510, a driving rod 520 and a blocking block 530; the fixing plate 510 is arranged at the end of the core sleeve 1 away from the hollow drill bit 2 and is fixedly connected with the core sleeve 1 through a plurality of fasteners; the driving rod 520 is fixedly connected with the fixing plate 510 and the blocking block 530 respectively, and the extension direction of the driving rod 520 is the same as the extension direction of the central axis of the core sleeve 1; the blocking block 530 is located in the drilling cavity 101 and is adapted to the drilling cavity 101.
[0047] For the core drilling device, as shown in Figure 1 and Figure 2 , the side of the core drilling device away from the hollow drill bit 2 is provided with a screwing assembly 5, which can provide a connection position for an external driving device to drive the core drilling device to rotate and advance towards the inside of the rock mass.
[0048] Exemplarily, the external driving device can adopt an electric drill device such as an impact drill, which can be used to drive the core drilling device to rotate so as to cut out a core sample on the rock mass by using the core drilling device.
[0049] For the screwing assembly 5, as shown in Figures 1-2 , the screwing assembly 5 comprises a fixing plate 510, a driving rod 520 and a blocking block 530; wherein the driving rod 520 can penetrate through the fixing plate 510 and be connected with the fixing plate 510, so that the driving rod 520 is partially located outside the core sleeve 1 and partially located inside the core sleeve 1; wherein the part located outside the core sleeve 1 is used to establish a connection relationship with the external driving device, so that the core sleeve 1 and the hollow drill bit 2 are driven to rotate by the external driving device through the screwing assembly 5; the fixing plate 510 is arranged at the end of the core sleeve 1 away from the hollow drill bit 2 and is fixed to the end of the core sleeve 1 through a plurality of fasteners, so as to realize the fixed connection between the driving column and the core sleeve 1.
[0050] Exemplarily, the fastener can adopt a detachable fastener such as a screw or a bolt, so as to disassemble, overhaul and clean the screwing assembly 5, which will not be described here again.
[0051] When the core sample is obtained, the core sample cut by the hollow drill bit 2 will enter the core sleeve 1 as the core drilling device is pushed in; as Figure 1 , Figure 2 and Figure 4As shown, for the blocking block 530, the blocking block 530 is located in the core sleeve 1 and is fixedly connected with the end of the driving rod 520, so as to position and block the core sample entering the core sleeve 1, and the blocking block 530 is matched with the drilling cavity 101, so that the stability of the blocking block 530 in the drilling cavity 101 can be improved, and the blocking effect on the core sample is guaranteed; when the core drilling device is rotated into the specified depth, the end surface of the core sample abuts against the surface of the blocking block 530, which indicates that the core sample is cut, and at this time, the core sample can be cut.
[0052] It should be noted that when the core sample is cut by the core drilling device, the core sleeve 1 can be withdrawn from the rock mass by a distance, so that the blocking block 530 is not in contact with the end of the core sample, thereby avoiding that a large friction is generated between the blocking block 530 and the end surface of the core sample in the cutting process, and the quality of the core sample is affected.
[0053] Exemplarily, the blocking block 530 can be formed of a rubber material with good wear resistance and heat resistance, which will not be described herein again.
[0054] In some embodiments, the rotating-in assembly 5 further comprises a support column 540 fixedly connected with the side of the blocking block 530 away from the fixed plate 510; the extension direction of the support column 540 is the same as the extension direction of the central axis of the core sleeve 1.
[0055] As shown in Figure 1 , Figure 2 and Figure 4 , the rotating-in assembly 5 further comprises a support column 540 fixedly connected with the side of the blocking block 530 away from the fixed plate 510, and the extension direction of the support column 540 is the same as the extension direction of the central axis of the core sleeve 1; as the core sleeve 1 gradually rotates into the rock mass, the support column 540 also enters the small hole of the core sample and gradually penetrates, and the small hole of the core sample is supported by the support column 540, so that the core drilling device is limited to rotate into the rock mass along a straight line, the cutting quality of the core sample is guaranteed, and the overall quality of the core sample is improved.
[0056] Exemplarily, the blocking block 530 can be formed of a rubber material with good wear resistance and heat resistance, which is conducive to reducing the wear degree of the hole wall of the small hole of the core sample and the surface of the support column 540, and guaranteeing the support effect on the core sample, which will not be described herein again.
[0057] In addition, since the strain monitoring device is arranged in the small hole of the core sample, the length of the support column 540 needs to be less than the length of the core sample, so as to avoid that the support column 540 affects the monitoring effect of the strain monitoring device on the core sample after entering the small hole.
[0058] In some embodiments, the outer wall of the core sleeve 1 is provided with a plurality of expansion portions 103, which are evenly distributed along the circumference of the core sleeve 1 and abut against the hollow drill bit 2, and a chip removal channel 1031 is formed between two adjacent expansion portions 103; the medium channel 3 is provided with a bend 301, which is located inside the expansion portion 103; along the sliding direction of the cutting tool 4, the bend 301 bends toward a direction away from the central axis of the core sleeve 1, and the bend 301 is connected to the receiving groove 102.
[0059] For core drilling equipment, under the cutting action of the hollow drill bit 2, the core sleeve 1 enters the rock mass along with the hollow drill bit 2; for example... Figures 1-3 As shown, by providing multiple expansion parts 103 protruding from the outer wall of the core sleeve 1 and aligning the edges of the expansion parts 103 with the edges of the hollow drill bit 2, the contact area between the hollow drill bit 2 and the core sleeve 1 can be increased, ensuring the stability of the core drilling device operation; more specifically, due to the increased contact area between the core sleeve 1 and the hollow drill bit 2, the number of connection points between the two can be increased, improving the firmness of the connection between the two.
[0060] Furthermore, when using the hollow drill bit 2 to cut the rock mass, a large amount of debris is generated in the annular borehole surrounding the core sample. As the hollow drill bit 2 continues to penetrate deeper and the debris continues to accumulate, it will affect the drilling process of the core extraction device; for example... Figure 3 As shown, for the expansion section 103, by uniformly distributing multiple expansion sections 103 along the circumference of the core sleeve 1, a chip removal channel 1031 can be formed between two adjacent expansion sections 103, allowing the chips generated during the cutting process to be discharged through the chip removal channel 1031. Since the expansion section 103 protrudes from the surface of the core sleeve 1, a gap is formed between the outer wall of the core sleeve 1 and the inner wall of the annular borehole, so that the chips discharged from the chip removal channel 1031 can be discharged out of the rock body through the gap.
[0061] It should be noted that when using a core drilling device to produce cores, a ring-shaped gap is cut around the core sample. To prevent the core drilling device from overheating and affecting its drilling efficiency, coolant can be injected into the ring-shaped borehole while cutting the rock to cool the core sleeve 1, hollow drill bit 2, and rock mass, reducing the expansion of the core sleeve 1 and hollow drill bit 2. At the same time, after the coolant is injected into the ring-shaped borehole, it will flow out from the gap and carry away some debris, preventing debris accumulation from affecting the working efficiency of the core drilling device.
[0062] For the medium channel 3, the medium channel 3 is provided with a bend 301, and the bend 301 is located within the expansion portion 103; such as Figure 1 and Figure 2, along the sliding direction of the cutting tool 4, by bending the bending part 301 towards the direction away from the central axis of the core sleeve 1, and making the bending part 301 communicate with the accommodating groove 102; the sufficient space can be reserved for the accommodating groove 102 in the expansion part 103, the internal hole of the accommodating groove 102 is increased, and the length of the tool body 420 of the cutting tool 4 is extended; it is ensured that the core sample can be fully cut off when the core sample is cut by the cutting tool 4.
[0063] In some embodiments, the circumferential side of the hollow drill bit 2 is provided with a plurality of chip removal grooves, each of which corresponds to a chip removal channel 1031.
[0064] When the hollow drill bit 2 is used to cut the rock mass, a columnar core sample can be cut in the rock mass, so that the debris generated during the formation of the core sample is mainly concentrated on the side of the hollow drill bit 2 away from the core sleeve 1; as shown in Figure 1 , Figure 2 and Figure 4 , by providing a plurality of chip removal grooves on the circumferential side of the hollow drill bit 2, and making each chip removal groove correspond to a chip removal channel 1031, the debris generated during cutting can be discharged from the chip removal port of the hollow drill bit 2 through the corresponding chip removal channel 1031 into the gap between the core sleeve 1 and the inner wall of the annular borehole, so as to prevent the accumulation of debris from affecting the working efficiency of the core drilling device.
[0065] In some embodiments, the cutting tool 4 is uniformly arranged along the circumference of the core sleeve 1, and each cutting tool 4 corresponds to a medium channel 3.
[0066] For the cutting tool 4, as shown in Figures 1-3 , by providing a plurality of cutting tools 4 in the core sleeve 1, the cutting efficiency of the core sample can be improved, and the plurality of cutting tools 4 are uniformly arranged along the circumference of the core sleeve 1, which can ensure the cutting quality of the core sample by the cutting tool 4; at the same time, each cutting tool 4 corresponds to a medium channel 3, so that each cutting tool 4 has good independence, and the interference degree between the cutting tools 4 is reduced.
[0067] Exemplarily, as shown in Figure 3 , six cutting tools 4 can be arranged in the core drilling device, and each cutting tool 4 corresponds to a medium channel 3, that is, six medium channels 3 are arranged in the side wall of the core sleeve 1.
[0068] In some embodiments, the core drilling device further comprises a medium distribution cavity 6, which is arranged in the side wall of the core sleeve 1 and communicates with the medium channel 3; the medium distribution cavity 6 is annular, and the medium distribution cavity 6 surrounds the drilling cavity 101.
[0069] When cutting the core sample, the hydraulic medium needs to be delivered to the accommodating groove 102 through the medium channel 3, and the cutting tool 4 is driven by the hydraulic medium to extend from the accommodating groove 102 to the drilling cavity 101; as shown in Figures 1-3 The core sleeve 1 is provided with a plurality of cutting tools 4, in order to ensure that the plurality of cutting tools 4 extend synchronously into the drilling cavity 101, a ring-shaped medium distribution cavity 6 is arranged in the side wall of the core sleeve 1, and the medium distribution cavity 6 surrounds the drilling cavity 101 and is in communication with the plurality of medium channels 3 respectively; at this time, the hydraulic medium can be synchronously delivered to the plurality of medium channels 3 through the medium distribution cavity 6, so that the plurality of cutting tools 4 can synchronously extend into the drilling cavity 101, which is beneficial to guarantee the cutting quality of the core sample and improve the control difficulty of the cutting tool 4.
[0070] Similarly, when the cutting tool 4 is recovered, the hydraulic medium in the plurality of accommodating grooves 102 can be synchronously returned to the medium distribution cavity 6 through the medium channel 3, so as to synchronously recover the plurality of cutting tools 4, which will not be described herein again.
[0071] In some embodiments, the first switch valve 104 and the second switch valve 105 are arranged at the end of the core sleeve 1 away from the hollow drill bit 2, and the switch valve and the switch valve are in communication with the medium distribution cavity 6.
[0072] When the extension state of the cutting tool 4 is controlled, the core drilling device needs to be connected with a hydraulic device 7 through the conduit 8, so as to adjust the state of the cutting tool 4 through the hydraulic device 7; when the core sample is drilled, the conduit 8 needs to be disconnected from the core drilling device, so as to avoid the influence of the conduit 8 on the rotation and advancement of the core drilling device; as shown in Figure 1 、 Figure 2 and Figure 4 The first switch valve 104 and the second switch valve 105 are arranged at the end of the core sleeve 1 away from the hollow drill bit 2, and the first switch valve 104 and the second switch valve 105 are in communication with the medium distribution cavity 6, and the content of the hydraulic medium in the core drilling device is adjusted by controlling the on-off state of the first switch valve 104 and the second switch valve 105, so as to realize the stable control of the cutting tool 4.
[0073] Exemplarily, when the extension state of the cutting tool 4 is controlled, the first switch valve 104 and the second switch valve 105 can be connected through the conduit 8 at the same time, and the first switch valve 104 and the second switch valve 105 are controlled to be opened, so that the conduit 8 is in communication with the medium distribution cavity 6, thereby realizing the supply and discharge of the hydraulic medium.
[0074] Exemplarily, when the core sample is drilled, the first switch valve 104 and the second switch valve 105 are controlled, and the first switch valve 104 and the second switch valve 105 are disconnected with the conduit 8, so as to avoid that the conduit 8 interferes with the normal operation of the core drilling device, and also prevent the hydraulic medium inside the core drilling device from leaking.
[0075] In addition, one of the first switch valve 104 and the second switch valve 105 can be used as an inlet switch valve, and the other can be used as an outlet switch valve, and the cutting tool 4 can also be controlled, which will not be described here.
[0076] It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the appended claims.
[0077] Each of the embodiments in the present application is described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts between the embodiments can be referred to each other.
[0078] The description of the present application is given for example and description, and is not exhaustive or limits the present application to the disclosed form. Many modifications and changes are obvious to those skilled in the art. The embodiments are selected and described in order to better illustrate the principles and practical application of the present application, and to enable those skilled in the art to understand the present application so as to design various embodiments with various modifications suitable for specific purposes.
[0079] Those skilled in the art should understand that the discussion of any of the above embodiments is only exemplary, and is not intended to limit the scope of the present application (including claims) to these examples; the above embodiments or technical features in different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the embodiments of the present application as described above. In order to be brief, they are not provided in details.
[0080] Although the present application has been described in conjunction with specific embodiments thereof, many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description.
[0081] The embodiments of the present application are intended to cover all such alternatives, modifications and variations which fall within the broad scope of the appended claims. Accordingly, any omission, modification, equivalent replacement, improvement, etc. made in the spirit and principle of the embodiments of the present application shall be included in the protection scope of the present application.
Claims
1. A core drilling apparatus, characterized by, The core sleeve is internally provided with a drilling cavity; A hollow drill bit is fixedly connected to one end of the core sleeve and communicates with the drilling cavity; A medium channel is arranged in the side wall of the core sleeve to accommodate hydraulic medium; A cutting tool is arranged in the accommodation groove in the inner side wall of the core sleeve and communicates with the medium channel; by changing the flow direction of the hydraulic medium between the medium channel and the accommodation groove, the cutting tool is driven to extend into the drilling cavity or retract into the accommodation groove; A screw-in assembly includes a fixed plate, a drive rod, and a blocking block; the fixed plate is arranged at the end of the core sleeve away from the hollow drill bit and is fixedly connected to the core sleeve by a plurality of fasteners; the drive rod is fixedly connected to the fixed plate and the blocking block, and the extension direction of the drive rod is the same as the extension direction of the central axis of the core sleeve; the blocking block is located in the drilling cavity and is adapted to the drilling cavity. The cutting tool includes:
2. The core drilling apparatus of claim 1, wherein, A piston block is slidably arranged in the accommodation groove and is adapted to the accommodation groove; A tool body is fixedly connected to the side of the piston block away from the medium channel port. The side wall of the accommodation groove protrudes to form a limiting portion, which is located on the side of the piston block away from the medium channel port.
3. The core drilling apparatus of claim 2, wherein, The screw-in assembly further includes:
4. The core drilling apparatus of claim 1, wherein, A support column is fixedly connected to the side of the blocking block away from the fixed plate; the extension direction of the support column is the same as the extension direction of the central axis of the core sleeve. The outer side wall of the core sleeve protrudes to form a plurality of expansion portions, which are uniformly distributed along the circumference of the core sleeve and abut against the hollow drill bit, and a chip removal channel is formed between adjacent two expansion portions; 5. The core drilling apparatus of claim 1, wherein, The medium channel is provided with a bending portion located in the expansion portion; along the sliding direction of the cutting tool, the bending portion is bent away from the central axis of the core sleeve, and the bending portion communicates with the accommodation groove. The circumferential side of the hollow drill bit is recessed to form a plurality of chip removal grooves, each of which corresponds to a chip removal channel.
6. The core drilling apparatus of claim 5, wherein, The cutting tools are uniformly arranged along the circumference of the core sleeve, and each cutting tool corresponds to a medium channel.
7. The core drilling apparatus of claim 5, wherein, Further including:
8. The core drilling apparatus of claim 1, wherein, A medium distribution cavity is arranged in the side wall of the core sleeve and communicates with the medium channel; The medium distribution cavity is annular, and the medium distribution cavity surrounds the drilling cavity. The end of the core sleeve away from the hollow drill bit is respectively provided with a first on-off valve and a second on-off valve, and the on-off valve and the on-off valve both communicate with the medium distribution cavity.
9. The core drilling apparatus of claim 8, wherein,