A pressure-maintaining coring sample cutting device

Abstract

The present invention discloses a pressure-maintaining coring sample cutting device, comprising a main body, a rotating tool holder, a driving assembly, a tool, a tool feed assembly and a window assembly, wherein a central channel is arranged on the main body, and a first assembly hole, a second assembly hole and a third assembly hole are arranged circumferentially around the same cross section of the central channel; the driving assembly is arranged in the first assembly hole, extends into the central channel, and is transmission-connected with the rotating tool holder; the rotating tool holder is nested and arranged on the inner side of the main body, rotates with the center line of the central channel as an axis, a through tool mounting hole is formed on the rotating tool holder, and the tool can be slidably arranged in the tool mounting hole; the tool mounting hole and the second assembly hole are arranged on the same plane; the tool feed assembly is arranged in the second assembly hole, and is used to push the tool toward the central channel; the window assembly is arranged in the third assembly hole, and an observation channel leading to the central channel is arranged on the window assembly. By performing visual cutting under pressure-maintaining state, the cutting efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of natural gas hydrate coring, and in particular to a pressure-maintaining coring sample cutting device. Background Art

[0002] Natural gas hydrates are considered to be a clean energy source with great potential in the future because of their abundant reserves, cleanliness and high energy density. At present, the research on the exploitation of natural gas hydrates still faces challenges, and the main problem lies in the complexity of the hydrate reservoir. During the sampling process, changes in environmental conditions can easily lead to phase changes, which in turn lead to the loss of the in-situ state and information of the sample, affecting the validity of the sample analysis results. Therefore, the existing sampling process usually uses an in-situ pressure-maintaining sampler for sampling, and then the samples taken out by the sampler are cut and transferred to a sample storage device for long-term storage. Hydrate samples obtained by pressure-maintaining coring technology need to be analyzed, tested and cut in a specific device to maintain their physical and mechanical properties and support further research.

[0003] However, due to the particularity of the pressure-maintaining environment and the instability of natural gas hydrates, conventional cutting methods are all carried out in a closed environment. The sample is invisible during the cutting process, the cutting structure is complex, the operation is difficult, and the incision cannot be observed. Therefore, the cutting efficiency cannot be guaranteed and the cutting effect cannot be evaluated.

[0004] Therefore, the prior art still needs to be improved and developed. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a pressure-maintained coring sample cutting device, aiming to solve the problems that the pressure-maintained cutting process of the existing natural gas hydrate coring samples is invisible, and the cutting efficiency and cutting effect are uncontrollable.

[0006] The technical solution of the present invention is as follows:

[0007] A pressure-maintaining coring sample cutting device, comprising a main body, a rotating tool holder, a driving assembly, a tool, a tool feed assembly and a window assembly, wherein the main body is provided with a central channel for inserting a coring sample, and a first assembly hole, a second assembly hole and a third assembly hole are circumferentially arranged around the same cross section of the central channel; the rotating tool holder is nested inside the main body and rotates around the center line of the central channel as an axis; and a through tool mounting hole is formed on the rotating tool holder along the radial direction of the central channel; the tool mounting hole and the second assembly hole are arranged on the same plane; the driving assembly The moving component is arranged in the first assembly hole; the driving component extends into the central channel and is transmission-connected with the rotating tool holder for driving the rotating tool holder to rotate; the tool can be slidably arranged in the tool mounting hole for extending into the central channel to cut into the coring sample; the tool feed component is arranged in the second assembly hole; when the rotating tool holder rotates until the second assembly hole is aligned with the tool mounting hole, the tool feed component can push the tool toward the central channel; the window component is arranged in the third assembly hole, and the window component is provided with an observation channel leading to the central channel.

[0008] The pressure-maintaining coring sample cutting device, wherein the main body includes a coaxially arranged center block and a first connecting block, and the center block and the first connecting block are connected to form the center channel; and a port groove is formed on the end of the inner wall of the center block that is connected to the first connecting block, and an accommodating space is formed between the end face of the port groove and the end face of the first connecting block; the accommodating space is used for nesting a locating bearing, the outer ring of the locating bearing is clamped in the accommodating space, and the inner ring of the locating bearing is sleeved on the rotating tool holder.

[0009] The pressure-maintaining coring sample cutting device, wherein the rotating tool holder is annular in shape and is axially divided into a connecting portion and a transmission portion, the connecting portion and the positioning bearing are nested with each other, and a toothed disc is formed on the end of the transmission portion that is away from the connecting portion; the first assembly hole extends along the radial direction of the center channel; the drive assembly includes a first fixed seat, at least two retaining bearings, and a transmission rod, the first fixed seat is plugged into the first assembly hole; the first fixed seat is hollow to form an axially extending channel; at least two retaining bearings are spaced apart in the channel; the transmission rod is arranged in the channel and is plugged into the inner ring of the retaining bearing; one end of the transmission rod extends to the center channel and is formed with a gear rod head, and the gear rod head is meshed with the toothed disc; the other end of the transmission rod is externally connected to a power device.

[0010] The pressure-maintaining coring sample cutting device, wherein the power device includes any one of a hand wheel, an engine, and a motor.

[0011] The pressure-maintaining coring sample cutting device is described, wherein the tool mounting hole is provided on the side wall of the transmission part, and the tool mounting hole is tightened toward one side of the central channel to form a resistance platform; a tool passing hole through which the tool passes is formed in the center of the resistance platform; the tool comprises a return spring and a tool head, one end of the return spring abuts against the end surface of the resistance platform facing the tool mounting hole, and the other side abuts against the tool head; the tool head comprises a sheet-shaped blade portion and a columnar handle portion, the blade portion is inserted into the inner side of the return spring and aligned with the tool passing hole, and the handle portion abuts against the return spring; when the second assembly hole is aligned with the tool mounting hole, the handle portion contacts the feed assembly; the return spring is used to push the tool head to move toward the second assembly hole.

[0012] The pressure-maintaining coring sample cutting device, wherein the length of the blade portion is greater than the radius of the radial cross section of the central channel.

[0013] The pressure-maintaining coring sample cutting device, wherein the feed assembly includes a second fixed seat and a piston, the second fixed seat is inserted into the second assembly hole; the second fixed seat is hollow to form an axially extending slideway; the piston is slidably arranged in the slideway, one end of the piston extends toward the central channel for contacting the tool handle; the other end of the piston is used for external hydraulic equipment.

[0014] The pressure-maintaining coring sample cutting device, wherein the feed assembly includes a third fixed seat, a sliding rod and a driving member, the third fixed seat is inserted into the second assembly hole; the third fixed seat is hollow to form an axially extending reciprocating channel; the sliding rod is arranged in the reciprocating channel, and the sliding rod is detachably connected to the tool; the driving member is transmission-connected to the sliding rod, and is used to drive the sliding rod to reciprocate in the second assembly hole to advance the tool toward the center channel or withdraw the tool away from the center channel.

[0015] The pressure-maintaining coring sample cutting device, wherein the third assembly hole extends in the radial direction of the central channel; the window assembly includes a fourth fixing seat and a sapphire block, the fourth fixing seat is inserted into the third assembly hole, and the fourth fixing seat is hollow to form an axially extending fixing channel; one end of the sapphire block is inserted into the fixing channel, and the other end extends into the third assembly hole.

[0016] Compared with the prior art, the embodiments of the present invention have the following advantages:

[0017] The pressure-maintained coring sample cutting device disclosed in the present invention is used for cutting samples taken out under pressure from natural gas hydrates. The main body is assembled on the pressure-maintained coring device. During cutting, the central channel is kept in a high-pressure state, so as to achieve the effect of cutting under in-situ pressure-maintained conditions. The internal situation in the central channel can be directly observed through the window assembly. When the coring sample is inserted into the cutting position, the feed assembly is started to insert the tool into the coring sample until it is pierced, and then the drive assembly is started to drive the rotating tool holder to rotate at a suitable angle to completely cut off the coring sample. During the cutting process, the cutting progress and cutting effect are observed through the observation channel. Finally, after observing that the cutting is completed, the tool is withdrawn to end the cutting. The entire cutting process is accurate and efficient, which is conducive to improving the cutting efficiency. In addition, the cutting position is accurate and the effect is controllable, which is conducive to accurate extraction of samples for research and analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, 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 recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic structural diagram of the pressure-maintaining coring sample cutting device in the present invention;

[0020] Figure 2 It is a structural exploded diagram of the pressure-maintaining coring sample cutting device in the present invention;

[0021] Figure 3 It is a top view of the pressure-maintaining coring sample cutting device of the present invention;

[0022] Figure 4 for Figure 3 The cross-sectional view along the AA` direction;

[0023] Figure 5 for Figure 4 A partial enlarged view of point C in the middle;

[0024] Figure 6 for Figure 3 The cross-sectional view along the BB` direction;

[0025] Figure 7 It is a structural schematic diagram of the rotary tool holder in the present invention;

[0026] Figure 8 It is a schematic diagram of the structure of the tool in the present invention;

[0027] Fig. 9 It is an axial cross-sectional view of a feed assembly in one embodiment of the present invention.

[0028] Among them, 10, main body; 11, central channel; 12, first assembly hole; 13, second assembly hole; 14, third assembly hole; 15, central block; 16, first connecting block; 161, second connecting block; 17, port slot; 18, positioning bearing; 20, rotating tool holder; 21, tool hole; 22, connecting part; 23, transmission part; 231, toothed disc; 24, blocking platform; 25, tool hole; 30, driving assembly; 31, first fixed seat; 311, channel; 32. Position bearing; 33. Transmission rod; 331. Gear rod head; 34. Hand wheel; 40. Tool; 41. Return spring; 42. Tool head; 421. Blade; 422. Tool handle; 50. Feed assembly; 51. Second fixed seat; 511. Slideway; 52. Piston; 53. Third fixed seat; 531. Reciprocating channel; 54. Slide; 55. Driving member; 60. Window assembly; 61. Observation channel; 62. Fourth fixed seat; 63. Sapphire block.

[0029] The labeled line segments in the accompanying drawings represent structural features of the entity, and the labeled arrows represent the features at the locations pointed by the arrows. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings 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.

[0031] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 6In one embodiment of the present invention, a pressure-maintaining coring sample cutting device is disclosed, which includes a main body 10, a rotating tool holder 20, a driving assembly 30, a cutter 40, a feed assembly 50 and a window assembly 60. The main body 10 is provided with a central channel 11 for inserting a coring sample, and a first assembly hole 12, a second assembly hole 13 and a third assembly hole 14 are circumferentially arranged around the same cross section of the central channel 11. The rotating tool holder 20 is nested inside the main body 10 and rotates around the center line of the central channel 11 as an axis; and a through tool mounting hole 21 is formed on the rotating tool holder 20 along the radial direction of the central channel 11; the tool mounting hole 21 and the second assembly hole 13 are arranged on the same plane. The driving assembly 30 is arranged in the first assembly hole 12; the driving assembly 30 extends into the central channel 11 and is in transmission connection with the rotating tool holder 20 to drive the rotating tool holder 20 to rotate. The cutter 40 can be slidably disposed in the cutter mounting hole 21, and is used to extend into the central channel 11 to cut into the core sample. The cutter feed assembly 50 is disposed in the second assembly hole 13; when the rotary tool holder 20 rotates until the second assembly hole 13 is aligned with the cutter mounting hole 21, the cutter feed assembly 50 can push the cutter 40 toward the central channel 11. The window assembly 60 is disposed in the third assembly hole 14, and is provided with an observation channel 61 leading to the central channel 11.

[0032] The pressure-maintained coring sample cutting device disclosed in this embodiment is used to cut the sample taken out under pressure from natural gas hydrate, and the central channel 11 is kept in a high pressure state to achieve the effect of cutting under in-situ pressure-maintained conditions. During the sampling process, the pressure-maintained coring device is generally used for in-situ sampling, and then the sample is transferred to the pressure-maintained sample storage device for storage and transportation.

[0033] One end of the pressure-maintaining coring sample cutting device disclosed in this embodiment is connected to the pressure-maintaining coring device, and the other end is connected to the pressure-maintaining sample storage device. After assembly, the two ends of the central channel 11 of the cutting device are connected to the inner cavity of the pressure-maintaining coring device and the inner cavity of the pressure-maintaining sample storage device respectively. By injecting high-pressure fluid, such as high-pressure nitrogen, into the central channel 11, a high-pressure environment can be maintained to be close to the original environment of the sample to avoid changes in the physical and chemical properties of the sample. The coring sample can enter the inner cavity of the pressure-maintaining sample storage device through the central channel 11, and be cut in the central channel 11 to cut a pressure-maintaining coring sample of a suitable length, which is convenient for loading into the pressure-maintaining sample storage device.

[0034] Specifically, the internal situation in the central channel 11 can be directly observed through the window assembly 60, and the core sample is inserted into the cutting position. In the initial state, the second assembly hole 13 is aligned with the knife hole 21, and the knife feed assembly 50 is started to push the knife 40 into the central channel 11 to insert it into the core sample until it is pierced; then the drive assembly 30 is started to drive the rotating knife holder 20 to rotate, and the core sample is completely cut off. During the cutting process, the cutting progress and cutting effect are observed through the observation channel 61; finally, after observing that the cutting is completed, the rotating knife holder 20 is rotated until the second assembly hole 13 is aligned with the knife hole 21 again, and the knife is withdrawn to the second assembly hole 13 to end the cutting. The entire cutting process is accurate and efficient, which is conducive to improving the cutting efficiency, and the cutting position is accurate and the effect is controllable, which is conducive to accurate extraction of samples for research and analysis.

[0035] Specifically, in this embodiment, flanges can be provided on the first assembly hole 12, the second assembly hole 13 and the third assembly hole 14, and the flanges are respectively closely matched with the drive assembly 30, the feed assembly 50, the window assembly 60, etc., so as to reduce the assembly gap and have good air tightness, so that a closed environment is formed in the central channel 11, which is conducive to maintaining a high-pressure steady state during the cutting process.

[0036] In addition, in this embodiment, the cutter 40 pierces the core sample and then rotates to cut it, so that only one cutter 40 is used to quickly and accurately cut the core sample. The structure is simple, the operation is convenient, and it is conducive to improving the cutting efficiency.

[0037] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, as another implementation of the present embodiment, it is disclosed that the main body 10 includes a coaxially arranged center block 15 and a first connecting block 16, and the center block 15 and the first connecting block 16 are connected to form the center channel 11; and, a port groove 17 is formed on the end of the inner wall of the center block 15 that is connected to the first connecting block 16, and an accommodating space is formed between the end face of the port groove 17 and the end face of the first connecting block 16; the accommodating space is used to nest a locating bearing 18, the outer ring of the locating bearing 18 is clamped with the accommodating space, and the inner ring of the locating bearing 18 is sleeved on the rotating tool holder 20.

[0038] In this embodiment, the main body 10 is made of stainless steel. The center block 15 is connected to the first connecting block 16 by slotting the end face of the center block 15 and fixing the first connecting block 16 by bolts or pins. A notch can be provided on the first connecting block 16 to connect with a pressure-maintaining coring device or a pressure-maintaining sample storage device.

[0039] like Figure 2 and Figure 6As shown, in this embodiment, a first connecting block 16 can be set at one end of the central block 15, and a second connecting block 161 can be set at the other end. The first connecting block 16 and the second connecting block 161 have the same structure and are relatively arranged at two ends of the central block 15, respectively connecting to the pressure-maintaining coring device and the pressure-maintaining sample storage device, thereby increasing stability during the cutting process.

[0040] Specifically, the port groove 17 is provided in this embodiment to form a receiving space in combination with the first connecting block 16 to assemble the positioning bearing 18, so that the rotating tool holder 20 sleeved on the inner ring of the positioning bearing 18 can rotate freely, reducing the rotation resistance. In addition, the inner ring of the positioning bearing 18 can be interference fit with the rotating tool holder 20, thereby improving the stability of the rotating tool holder 20.

[0041] like Figure 1 , Figure 2 , Figure 6 and Figure 7 As shown, as another implementation of this embodiment, the shape of the rotating tool holder 20 is annular, and is divided into a connecting portion 22 and a transmission portion 23 along the axial direction. The connecting portion 22 and the positioning bearing 18 are mutually nested, and a toothed disc 231 is formed on the end of the transmission portion 23 away from the connecting portion 22. The annular rotating tool holder 20 can rotate 360°, and the rotation angle can be adjusted at will, so that the tool 40 can be rotated by a sufficient angle along the circumferential direction of the central channel 11 by rotating the rotating tool holder 20 to 180° or 360°, or more than 360°, so as to completely cut off the core sample, thereby achieving the effect of ensuring the cutting.

[0042] Specifically, in this embodiment, the connecting portion 22 and the transmission portion 23 may be integrally formed, and the structure of the rotating tool holder 20 is stable.

[0043] For example Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the first assembly hole 12 extends in the radial direction of the central channel 11; the driving component 30 includes a first fixed seat 31, at least two retaining bearings 32, and a transmission rod 33, the first fixed seat 31 is inserted in the first assembly hole 12; the first fixed seat 31 is hollow to form an axially extending channel 311; at least two retaining bearings 32 are spaced apart in the channel 311; the transmission rod 33 is arranged in the channel 311 and is inserted into the inner ring of the retaining bearing 32; one end of the transmission rod 33 extends to the central channel 11 and is formed with a gear rod head 331, and the gear rod head 331 is meshed with the toothed disc 231; the other end of the transmission rod 33 is externally connected to a power device.

[0044] In this embodiment, the first fixing seat 31 and the main body 10 can be connected by a flange, the assembly gap at the connection is small, and the connection is stable and not easy to loosen. The sizes of the retaining bearings 32 used in the driving assembly 30 are all the same, and they are arranged in a straight line in the channel 311. The transmission rod 33 passes through the inner ring of the retaining bearing 32, thereby achieving a multi-point support effect, and is suspended and fixed in the channel 311, and can rotate along the circumferential direction of the channel 311.

[0045] Specifically, the transmission rod 33 is arranged along the axial direction of the first assembly hole 12, with one end extending into the central channel 11, and a gear rod head 331 is provided. The gear rod head 331 is columnar in shape, and a plurality of protruding teeth are provided on its annular side wall, which are adapted to the tooth patterns on the toothed disk 231 of the rotating tool holder 20, that is, mechanical transmission is achieved by meshing the gear rod head 331 with the toothed disk 231.

[0046] In addition, the other end of the transmission rod 33 extends to the outside of the main body 10 and is connected to the power device. When the power device outputs torque, the transmission rod 33 rotates, and the gear rod head 331 drives the toothed disc 231 to rotate, that is, the rotation of the rotating blade holder 20 is realized. The entire transmission process is tightly assembled, the transmission accuracy is high, and the control is convenient, which is conducive to accurately controlling the rotation angle of the rotating blade holder 20, thereby improving the cutting accuracy.

[0047] Specifically, as another implementation of this embodiment, the power device includes any one of a hand wheel 34, an engine, and a motor. In this embodiment, the hand wheel 34 can be set to twist the transmission rod 33 in a human way, such as Figure 2 and Figure 4 As shown, the core sample is cut and the operation is simple and convenient. In this embodiment, automatic control can also be adopted, and the transmission rod 33 is driven to rotate by an engine or a motor, which saves manpower and accurately controls the rotation angle.

[0048] It should be noted that the types of power equipment are only exemplified in this embodiment, but the protection scope of the present invention is not limited to this. As long as other types of power equipment can achieve the technical effects disclosed in this application, they should also be within the scope of protection of this application as equivalent replacements for the concepts of the present invention.

[0049] like Figure 4 and Figure 5 As shown, as another implementation of this embodiment, it is disclosed that the side wall of the transmission part 23 is provided with the tool mounting hole 21, and the tool mounting hole 21 is tightened toward one side of the central channel 11 to form a resistance platform 24; the center of the resistance platform 24 is formed with a tool passing hole 25 for the tool 40 to pass through.

[0050] In this embodiment, the through-knife hole 25 is formed by reducing the diameter of the knife hole 21 toward the central channel 11, so that the cutting position of the knife 40 is more accurate. The shape of the through-knife hole 25 can be set to match the shape of the knife 40. When the knife 40 passes through the through-knife hole 25, the side wall of the through-knife hole 25 can also provide a certain support, so that the knife 40 is more stable during use. In addition, the blocking platform 24 can also block part of the knife hole 21, thereby reducing the sample debris from the central channel 11 entering the knife hole 21 during cutting, and preventing the movement of the knife 40 from being affected.

[0051] like Figure 4 , Figure 5 and Figure 8 As shown, the tool 40 includes a reset spring 41 and a cutter head 42, one end of the reset spring 41 abuts against the end face of the abutting platform 24 facing the tool mounting hole 21, and the other end abuts against the cutter head 42; the cutter head 42 includes a sheet-shaped blade portion 421 and a columnar handle portion 422, the blade portion 421 is inserted into the inner side of the reset spring 41 and aligned with the tool passing hole 25, and the handle portion 422 abuts against the reset spring 41; when the second assembly hole 13 is aligned with the tool mounting hole 21, the handle portion 422 contacts the feed assembly 50; the reset spring 41 is used to push the cutter head 42 to move toward the second assembly hole 13.

[0052] In this embodiment, the cutter head 42 is formed by die casting or sheet metal, the blade portion 421 is flat and thin, with high sharpness, and can cut core samples, the handle portion 422 is wide and thick, can withstand the extrusion force, and is in contact with the return spring 41 and the feed assembly 50 to play a connecting role.

[0053] Specifically, the reset spring 41 abuts against the cutter head 42. During cutting, the second assembly hole 13 is aligned with the tool mounting hole 21. The feed assembly 50 pushes the shank portion 422 toward the center channel 11. The blade portion 421 passes through the reset spring 41 and the tool hole 25 and is inserted into the core sample of the center channel 11 until the shank portion 422 completely enters the tool mounting hole 21. At this time, the rotating tool holder 20 is rotated, and the tool mounting hole 21 is staggered with the second assembly hole 13. The shank portion 422 is subjected to the elastic force of the reset spring 41 and abuts against the side wall of the center channel 11 to remain stable, thereby achieving rotary cutting.

[0054] After the cutting is completed, the rotary tool holder 20 rotates until the second assembly hole 13 is aligned with the tool mounting hole 21, the feed assembly 50 retreats, the handle portion 422 loses support, and is pushed by the elastic potential energy released by the return spring 41, thereby moving toward the second assembly hole 13, and the blade portion 421 also retreats from the central channel 11, thereby completing the automatic retreat operation, so as to facilitate the removal of the cut coring sample and continue to move the next section of the coring sample into the central channel 11.

[0055] That is to say, in this embodiment, the reset spring 41 is provided to help maintain the stability of the cutter head 42 and achieve automatic retraction, which is beneficial to improving the stability of the cutting process, simplifying the operation, and improving the cutting efficiency.

[0056] Specifically, in another implementation of the present embodiment, a flexible wiper is provided at one end of the knife hole 21 facing the central channel 11. The flexible wiper includes but is not limited to a wiper made of flexible materials such as a rubber block, a sponge block, and a plastic block. The flexible wiper is provided at the front end of the blade portion 421. When the blade portion 421 completes cutting, the flexible wiper contacts the surface of the blade portion 421 during the knife withdrawal process and wipes off the sample residue remaining on the blade portion 421, thereby ensuring that the surface of the blade head 42 is clean, so as to facilitate repeated use and improve the flatness of the cutting surface. In addition, Figure 5 As shown, the cross-sectional area of ​​the knife hole 25 disclosed in this embodiment is small, and a flexible wiper block can be filled in the knife hole 25 to increase stability, and the knife head 42 enters the central channel 11 by piercing the flexible wiper block.

[0057] Specifically, as another implementation of this embodiment, it is disclosed that the length value of the blade portion 421 is greater than the radius value of the radial cross section of the central channel 11. In this embodiment, only the blade portion 421 of the cutter head 42 is inserted into the central channel 11. In order to ensure that the coring sample in the central channel 11 is completely cut off, the length value of the blade portion 421 is set to be greater than the radius value of the radial cross section of the central channel 11, so that when the rotating tool holder 20 rotates 360°, the cutting surface of the blade portion 421 can cover the entire radial cross section of the central channel 11, achieving a complete truncation effect.

[0058] like Figure 8 As shown, the blade portion 421 is shaped like a dagger, with blades on both sides, so that the rotary blade holder 20 can be rotated in any direction to achieve a smooth cutting effect.

[0059] like Figure 8 As shown, as another implementation of this embodiment, a connection positioning groove is provided on the end surface of the handle portion 422 away from the blade portion 421, and a connection positioning protrusion is provided on the feed assembly 50; wherein the connection positioning protrusion is adapted to the connection positioning groove. By providing the connection positioning groove and the connection positioning protrusion, the docking accuracy and assembly accuracy of the feed assembly 50 and the handle portion 422 are increased, so that the feed assembly 50 is more stable in the process of connecting and pushing the cutter head 42, and the effect of stabilizing the feed is achieved.

[0060] Specifically, as another implementation of this embodiment, it is disclosed that the cutter head 42 is made of any one of non-metallic materials such as zirconium oxide ceramics, silicon nitride ceramics, glass fiber reinforced plastics, etc. The use of a cutter head 42 with high strength, stable structure, and poor thermal conductivity can reduce temperature changes during the cutting process, avoid the problem of natural gas hydrate decomposition, and extend the service life of the cutter head 42.

[0061] like Figure 2 and Figure 4 As shown, as another implementation of this embodiment, the feed assembly 50 is disclosed to include a second fixed seat 51 and a piston 52, the second fixed seat 51 is inserted into the second assembly hole 13; the second fixed seat 51 is hollow to form an axially extending slide 511; the piston 52 is slidably arranged in the slide 511, one end of the piston 52 extends toward the central channel 11 for contacting the tool handle portion 422; the other end of the piston 52 is used for external hydraulic equipment.

[0062] In this embodiment, the second fixing seat 51 is connected to the main body 10 through a flange to achieve a sealing effect and ensure that there is no pressure leakage. The piston 52 moves in the slide 511 and is controlled by an external hydraulic device. During cutting, the second assembly hole 13 is aligned with the tool hole 21, and the cutter head 42 is pushed into the second assembly hole 13 by the reset spring 41 and abuts against the piston 52. At this time, the thrust is output through the hydraulic equipment, squeezing the reset spring 41 and pushing the cutter head 42 into the tool hole 21 to achieve the feed operation. The use of hydraulic transmission has high control accuracy and large torque, which is conducive to increasing the stability of the movement of the cutter head 42.

[0063] In addition, in this embodiment, a magnetic member, such as a magnet, can be provided on the side where the piston 52 contacts the cutter head 42. The magnetic member can achieve a magnetic attraction effect, so that the piston 52 and the handle 422 can be quickly connected and the connection can be kept stable during the cutting process.

[0064] like Fig. 9 As shown, as another implementation of the present embodiment, the feed assembly 50 is disclosed to include a third fixed seat 53, a slide rod 54 and a driving member 55, wherein the third fixed seat 53 is inserted and arranged in the second assembly hole 13; the third fixed seat 53 is hollow to form an axially extending reciprocating channel 531; the slide rod 54 is arranged in the reciprocating channel 531, and the slide rod 54 is detachably connected to the tool 40; the driving member 55 is transmission-connected to the slide rod 54, and is used to drive the slide rod 54 to reciprocate in the second assembly hole 13, so as to push the tool 40 toward the center channel 11 or withdraw the tool 40 away from the center channel 11.

[0065] In this embodiment, the third fixing seat 53 is connected to the main body 10 through a flange, which has a good sealing effect and a stable connection. The knife feeding operation is realized by a sliding rod 54. The driving member 55 can be an engine or a motor, and the sliding rod 54 is pushed by the output thrust, so that the tool 40 can be pushed into the central channel 11.

[0066] It should be noted that the present embodiment only exemplifies the transmission method in which the feed assembly 50 and the tool 40 can be driven by the piston 52 or the slide rod 54, but the protection scope of the present invention is not limited to this. As long as other types of transmission methods can achieve the technical effects disclosed in this application, they should also be within the scope of protection of this application as equivalent replacements for the concepts of the present invention.

[0067] like Figure 2 , Figure 3 and Figure 6 As shown, as another implementation of this embodiment, the third assembly hole 14 is disclosed to extend in the radial direction of the central channel 11; the window assembly 60 includes a fourth fixing seat 62 and a sapphire block 63, the fourth fixing seat 62 is inserted into the third assembly hole 14, and the fourth fixing seat 62 is hollow to form an axially extending fixing channel; one end of the sapphire block 63 is inserted into the fixing channel, and the other end extends into the third assembly hole 14.

[0068] In this embodiment, the fourth fixing seat 62 is connected to the main body 10 via a flange. The fixing channel provided in the fourth fixing seat 62 is used to assemble and fix the sapphire block 63. The sapphire block 63 has a stable structure, is resistant to high pressure, and has a certain degree of transparency, which is conducive to observing the situation in the central channel 11 through the sapphire block 63, so as to achieve the effect of real-time monitoring of the cutting process and adjusting the cutting angle and direction at any time.

[0069] In addition, in another implementation of this embodiment, the end surface of the sapphire block 63 facing the central channel 11 is flush with the end of the third assembly hole 14 that abuts the central channel 11. One end of the sapphire block 63 facing the central channel 11 matches the shape of the side wall of the central channel 11 and is set to an arc shape, and the radius of the arc is the same as the radius of the central channel, so that when the tool mounting hole 21 rotates to overlap with the third assembly hole 14, the sapphire block 63 can abut the cutter head 42 to prevent the tool 40 from popping out of the tool mounting hole 21, thereby maintaining stability during the cutting process.

[0070] For example Figure 2 As shown, as another implementation of this embodiment, two third assembly holes 14 are provided, which are symmetrically arranged on the main body 10; two groups of window assemblies 60 are provided, which are respectively arranged in the two third assembly holes 14. By symmetrically arranging the window assemblies 60, the observable angle is increased, so that the situation inside the central channel 11 can be observed more clearly.

[0071] Specifically, as another implementation of this embodiment, the drive assembly 30 and the feed assembly 50 are symmetrically arranged on the main body 10, and the connection direction of the two sets of window assemblies 60 is perpendicular to the connection direction of the drive assembly 30 and the feed assembly 50. By setting an assembly hole at every 90° interval, the four sets of components, namely, the two sets of window assemblies 60, the drive assembly 30, and the feed assembly 50, are evenly arranged in a ring shape on the outer wall of the main body 10 to avoid interference, and the layout is reasonable, which is conducive to balancing the center of gravity of the pressure-maintaining coring sample cutting device.

[0072] In summary, the present application discloses a pressure-maintaining coring sample cutting device, which includes a main body 10, a rotating tool holder 20, a driving assembly 30, a tool 40, a tool feed assembly 50 and a window assembly 60. The main body 10 is provided with a central channel 11 for inserting a coring sample, and a first assembly hole 12, a second assembly hole 13 and a third assembly hole 14 are circumferentially arranged around the same cross-section of the central channel 11; the rotating tool holder 20 is nested inside the main body 10 and rotates around the center line of the central channel 11 as an axis; and a through tool mounting hole 21 is formed on the rotating tool holder 20 along the radial direction of the central channel 11; the tool mounting hole 21 and the second assembly hole 13 are arranged on the same plane; The driving assembly 30 is arranged in the first assembly hole 12; the driving assembly 30 extends into the central channel 11 and is transmission-connected with the rotating tool holder 20, so as to drive the rotating tool holder 20 to rotate; the tool 40 can be slidably arranged in the tool mounting hole 21, so as to extend into the central channel 11 to cut into the coring sample; the tool feed assembly 50 is arranged in the second assembly hole 13; when the rotating tool holder 20 rotates until the second assembly hole 13 is aligned with the tool mounting hole 21, the tool feed assembly 50 can push the tool 40 toward the central channel 11; the window assembly 60 is arranged in the third assembly hole 14, and the window assembly 60 is provided with an observation channel 61 leading to the central channel 11.

[0073] The pressure-maintained coring sample cutting device disclosed in this embodiment is used to cut samples taken out under pressure from natural gas hydrates. The main body 10 is assembled on the pressure-maintained coring device. During cutting, the central channel 11 maintains a high pressure state, achieving the effect of cutting under in-situ pressure-maintained conditions. The internal situation in the central channel 11 can be directly observed through the window assembly 60. When the coring sample is inserted to the cutting position, the feed assembly 50 is started to insert the tool 40 into the coring sample until it is pierced, and then the drive assembly 30 is started to drive the rotating tool holder 20 to rotate at a suitable angle to completely cut off the coring sample. During the cutting process, the cutting progress and cutting effect are observed through the observation channel 61. Finally, after observing that the cutting is completed, the tool is withdrawn to end the cutting. The entire cutting process is accurate and efficient, which is conducive to improving the cutting efficiency. In addition, the cutting position is accurate and the effect is controllable, which is conducive to accurate extraction of samples for research and analysis.

[0074] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0075] It should be noted that the present invention takes the pressure-maintaining coring sample cutting device as an example to introduce the specific structure and working principle of the present invention, but the application of the present invention is not limited to the pressure-maintaining coring sample cutting device, and can also be applied to the production and use of other similar workpieces.

[0076] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0077] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A pressure-maintaining coring sample cutting device, characterized in that: include: A main body, wherein the main body is provided with a central channel for inserting a core sample, and a first assembly hole, a second assembly hole and a third assembly hole are circumferentially provided in the same cross section around the central channel; A rotating tool holder is nested inside the main body and rotates with the center line of the central channel as an axis; and a through tool mounting hole is formed on the rotating tool holder along the radial direction of the central channel; the tool mounting hole and the second mounting hole are arranged on the same plane; A driving assembly is arranged in the first assembly hole; the driving assembly extends into the central channel and is drivingly connected to the rotating tool holder to drive the rotating tool holder to rotate; A cutter, slidably disposed in the cutter mounting hole, for extending into the central channel to cut into the coring sample; A tool feed assembly is disposed in the second assembly hole; when the rotary tool holder rotates until the second assembly hole is aligned with the tool mounting hole, the tool feed assembly can push the tool toward the central channel; as well as A window assembly, arranged in the third assembly hole, wherein the window assembly is provided with an observation channel leading to the central channel; The main body comprises a coaxially arranged center block and a first connecting block, wherein the center block and the first connecting block are butted together to form the center channel; and a port groove is formed on an inner wall of the center block at one end butted with the first connecting block, and an accommodation space is formed between an end surface of the port groove and an end surface of the first connecting block; Wherein, the accommodation space is used for nesting the locating bearing, the outer ring of the locating bearing is engaged with the accommodation space, and the inner ring of the locating bearing is sleeved on the rotating tool holder; The rotating tool holder is annular in shape and is divided into a connecting portion and a transmission portion along the axial direction. The connecting portion and the positioning bearing are mutually nested, and a toothed disc is formed on one end of the transmission portion away from the connecting portion. The first assembly hole extends along the radial direction of the central channel; The drive assembly comprises: A first fixing seat is inserted into the first assembly hole; the first fixing seat is hollow to form an axially extending channel; At least two retaining bearings are arranged in the hole at intervals; A transmission rod is arranged in the hole and plugged into the inner ring of the positioning bearing; Among them, one end of the transmission rod extends to the central channel and is formed with a gear rod head, and the gear rod head is meshed with the gear plate; the other end of the transmission rod is externally connected to a power device.

2. The pressure-maintaining coring sample cutting device according to claim 1, characterized in that: The power equipment includes any one of a hand wheel, an engine and a motor.

3. The pressure-maintaining coring sample cutting device according to claim 1, characterized in that: The side wall of the transmission part is provided with the tool mounting hole, and the tool mounting hole is tightened toward one side of the central channel to form a resistance platform; a tool passing hole for the tool to pass through is formed at the center of the resistance platform; The tool comprises a return spring and a cutter head, one end of the return spring abuts against the end surface of the abutting platform facing the cutter hole, and the other end abuts against the cutter head; The cutter head comprises a blade portion in the form of a sheet and a handle portion in the form of a column, the blade portion is inserted into the inner side of the return spring and aligned with the cutter hole, and the handle portion abuts against the return spring; Wherein, when the second assembly hole is aligned with the tool mounting hole, the tool handle portion contacts the tool feed assembly; and the return spring is used to push the tool head to move toward the second assembly hole.

4. The pressure-maintaining coring sample cutting device according to claim 3, characterized in that: The length of the blade portion is greater than the radius of the radial cross section of the central channel.

5. The pressure-maintaining coring sample cutting device according to claim 3, characterized in that: The feed assembly comprises: A second fixing seat is inserted into the second assembly hole; the second fixing seat is hollow to form an axially extending slideway; A piston is slidably disposed in the slideway, one end of the piston extends toward the central channel for contacting the tool handle, and the other end of the piston is used for connecting to an external hydraulic device.

6. The pressure-maintaining coring sample cutting device according to claim 1, characterized in that: The feed assembly comprises: A third fixing seat is inserted into the second assembly hole; the third fixing seat is hollow to form an axially extending reciprocating channel; A slide bar, disposed in the reciprocating channel, the slide bar being detachably connected to the tool; A driving member is transmission-connected with the slide bar and is used to drive the slide bar to reciprocate in the second assembly hole so as to push the tool toward the central channel or withdraw the tool away from the central channel.

7. The pressure-maintaining coring sample cutting device according to any one of claims 1 to 6, characterized in that: The third assembly hole extends in the radial direction of the central channel; the window assembly includes a fourth fixing seat and a sapphire block, the fourth fixing seat is inserted in the third assembly hole, and the fourth fixing seat is hollow to form an axially extending fixing channel; one end of the sapphire block is inserted in the fixing channel, and the other end extends into the third assembly hole.

Images