Core tube anti-chip-falling structure and its usage method of pressure-holding coring equipment

Abstract

This invention relates to a core tube anti-chip-shedding structure and its usage method in a pressure-holding coring device. The structure includes an outer tube, a pressure-holding controller, a core tube, a closure control tube, and two separate sleeves. Each separate sleeve includes an axial extension, a locking pin, and an arc-shaped shielding portion. The core tube has a pin hole adapted to the locking pin. The inner wall of the closure control tube has a first limiting portion and a second limiting portion. When the pressure-holding controller is open, the two separate sleeves are symmetrically installed between the core tube and the closure control tube, located between the first and second limiting portions. A compression spring is provided between the separate sleeves and the closure control tube. The arc-shaped shielding portion presses against the core tube. The lower end of the core tube is open, and the pin hole is located below the locking pin. The separate sleeves of this application can partially seal the core tube, reducing chip shedding around the inside of the core tube from the source. This significantly reduces the amount of coal dust falling from the valve cover and valve seat contact surface of the pressure-holding controller, helping to improve the sealing performance of the valve seat and valve cover, and ensuring the pressure-holding performance of the coring device.

Description

Technical Field

[0001] This invention relates to the field of pressure-holding coring technology, and more particularly to the core tube anti-chip-falling structure of pressure-holding coring and its usage method. Background Technology

[0002] The pressure-maintaining gas core drill is a gas and coal sample collection device with pressure-maintaining function. The main working method is to load the pressure-maintaining gas into the external drilling tool and continue drilling a certain distance in the working face to allow the coal sample to enter the core tube. Then, the core tube is lifted into the core chamber. The lower end of the core chamber is sealed by a pressure-maintaining controller, thereby providing pressure-maintaining space for the coal sample.

[0003] The pressure-holding controller includes a valve seat and a valve cover. The valve seat has a sealing surface that matches the valve cover. The core tube can pass through the valve seat. When the core tube is in the valve seat, the valve disc opens. When the core tube is raised to a certain height, the valve disc closes with the valve seat, thus providing pressure-holding space for the rock sample. Since the core tube contains coal sample, coal dust may fall onto the valve seat sealing surface as the core tube passes through the valve seat, affecting the sealing performance of the valve seat and valve cover, and ultimately affecting the pressure-holding performance of the corer. Summary of the Invention

[0004] This application provides a core tube anti-chip-falling structure for a pressure-holding coring device and its usage method to solve the above-mentioned technical problems.

[0005] This application is achieved through the following technical solution:

[0006] The core tube anti-chip-falling structure of the pressure-holding coring device provided in this application includes an outer tube, a pressure-holding controller, a core tube, a closure control tube, and two separate sleeves. The pressure-holding controller and the closure control tube are coaxially mounted inside the outer tube. The closure control tube is located below the pressure-holding controller, and the core tube can pass through the closure control tube.

[0007] The split casing includes an axial extension, a locking pin on the inner wall of the axial extension, and an arc-shaped blocking part at the lower end of the axial extension. A pin hole adapted to the locking pin is provided at the corresponding position of the core tube. The inner wall of the closure control tube is provided with a first limiting part and a second limiting part for restricting the axial movement of the split casing at the positions corresponding to the two split casings.

[0008] In the initial state, the pressure holding controller is turned on, and two separate casings are symmetrically installed between the core tube and the closing control tube. The separate casings are located between the first limiting part and the second limiting part. A compression spring is provided between the outer wall of the separate casing and the inner wall of the closing control tube. The inner edge of the arc-shaped shielding part is pressed against the outer wall of the core tube under the action of the spring. The lower end of the core tube is open, and the pin hole on the core tube is located below the locking pin of the separate casing.

[0009] Optionally, the inner wall of the closure control tube has a first radial post, which is located between the first limiting part and the second limiting part; the outer surface of the axial extension has a second radial post that is adapted to the first radial post, and in the initial state, the spring is sleeved on the first radial post and the second radial post.

[0010] Specifically, the axial extension is a semi-circular tube.

[0011] Optionally, the first limiting part and the second limiting part are fan-shaped thin plate structures.

[0012] Specifically, the locking pin is T-shaped, with rounded corners at both ends of the horizontal portion of the T-shaped locking pin.

[0013] Optionally, the upper and lower inner walls of the closure control tube each have an upper annular boss and a lower annular boss, and the inner diameter of the upper annular boss and the lower annular boss are consistent with the outer diameter of the core tube.

[0014] Specifically, the two separate sleeves form a closed loop after being closed and connected.

[0015] Optionally, the outer tube includes a first outer tube and a second outer tube, with the upper end of the first outer tube threadedly connected to the lower end of the second outer tube, the pressure holding controller installed inside the second outer tube, and the closing control tube installed inside the first outer tube.

[0016] The pressure holding controller includes a valve seat and a valve cover, with a sealing surface on the top of the valve seat that matches the valve cover; the valve seat and valve cover may or may not have permanent magnets.

[0017] The method of using the core tube anti-chip-falling structure of the pressure-holding coring device provided in this application includes the following steps:

[0018] When the pressure holding controller is activated, the core tube passes through the closed control tube and the inner hole of the pressure holding controller. The two separate sleeves are restricted between the first and second limiting parts of the closed control tube. The spring is compressed between the inner wall of the closed control tube and the outer wall of the separate sleeve. The inner edge of the arc-shaped shielding part is pressed tightly against the outer wall of the core tube under the action of elasticity. The two separate sleeves separate, the lower end of the core tube is open, and the pin hole on the core tube is located below the locking pin.

[0019] Once the core sampler completes its collection, the core tube moves upward under external force. When the lower end of the core tube moves past the arc-shaped obstruction of the split casing, the pin hole and the locking pin are aligned. At this point, the support of the core tube on the split casing disappears, and the split casing moves radially under the elastic force of the spring. The two arc-shaped obstructions move radially until they close, forming a closed loop. The locking pin of the split casing also engages with the pin hole of the core tube, locking the split casing and the core tube together.

[0020] The core tube, along with the split casing, continues to move upwards, and the pressure holding controller closes, forming a sealed pressure holding space.

[0021] Compared with the prior art, this application has the following beneficial effects:

[0022] 1. The separate casing section of this application seals the core tube, which to a certain extent reduces the falling of coal dust inside the core tube from the source, especially the falling of dust around the inside of the core tube. This can greatly reduce the falling of coal dust from the contact surface of the valve cover and valve seat of the pressure holding controller, which helps to improve the sealing performance of the valve seat and valve cover and ensure the pressure holding performance of the core sampler.

[0023] 2. This application adopts a split casing design, which can make full use of the space inside the outer tube, and uses a simple snap-fit ​​structure to lock the split casing and the core tube, so that the split casing can move together with the core tube to achieve the effect of semi-sealing the core tube.

[0024] 3. This application uses a very simple mechanical structure, employing a spring in conjunction with the axial movement inherent in the core tube itself, to achieve the opening, holding, and closing actions of the split casing. Attached Figure Description

[0025] The accompanying drawings, which are included to provide a further understanding of the embodiments of this application and form part of this application, do not constitute a limitation on the embodiments of the present invention.

[0026] Figure 1 This is a cross-sectional view of the core tube anti-chipping structure in the initial state of the embodiment;

[0027] Figure 2 This is a cross-sectional view of the core tube anti-chipping structure when the core tube is moved to the position where the locking pin and the pin hole are aligned in the embodiment.

[0028] Figure 3 This is a cross-sectional view of the core tube anti-chip-falling structure after the split casing is closed in the embodiment;

[0029] Figure 4 This is a cross-sectional view of the core tube anti-chipping structure in the final state of the embodiment;

[0030] Figure 5 This is a half-sectional view of the closure control tube in the embodiment;

[0031] Figure 6 This is a three-dimensional view of the split sleeve in the embodiment;

[0032] Figure 7 This is a partially enlarged view of the core tube anti-chipping structure in the initial state of the embodiment;

[0033] Figure 8 This is a three-dimensional view of the separate casing and core tube in the initial state of the embodiment;

[0034] Figure 9This is a three-dimensional view of the separated casing and core tube in the final state of the embodiment. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0037] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other. It should also be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments; similar or identical parts between embodiments can be referred to interchangeably.

[0038] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0039] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0040] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0041] like Figure 1-4 As shown, the core tube anti-chip-falling structure of the pressure-holding coring device disclosed in this embodiment includes an outer tube, a pressure-holding controller, a core tube 5, and a closure control tube 6. The pressure-holding controller and the closure control tube 6 are coaxially mounted inside the outer tube, and the core tube 5 can pass through the center of the closure control tube 6.

[0042] The pressure holding controller includes a valve seat 3 and a valve cover 4. The top of the valve seat 3 has a sealing surface that matches the valve cover 4. The top of the valve seat 3 is movably connected to the valve cover 4 via a shaft 32. When the core tube 5 is located in the valve seat 3, the valve cover 4 is open and located in the annular space between the core tube 5 and the outer tube. When the core tube 5 is lifted to a certain height, the valve cover 4 flips over to close with the valve seat 3. This is conventional technology in the field and will not be described in detail here.

[0043] In one possible design, the valve seat 3 is provided with multiple permanent magnets 31 along the circumference, and the valve cover 4 is also provided with permanent magnets 31. The permanent magnets 31 on the valve seat 3 can attract the permanent magnets 31 on the valve cover 4, thereby increasing the sealing pressure and improving the sealing stability.

[0044] like Figure 5 As shown, the closed control tube 6 is an annular hollow structure. The closed control tube 6 is coaxially fixed inside the outer tube. The inner diameter of the closed control tube 6 is larger than the outer diameter of the core tube 5, so that when the core tube 5 passes through the closed control tube 6, there is a gap between the inner wall of the closed control tube 6 and the outer wall of the core tube 5. This gap is mainly used to provide space for the radial movement of the split casing 7.

[0045] like Figures 1-9 As shown, in the initial state, two separate casings 7 are symmetrically installed between the closed control tube 6 and the core tube. The separate casing 7 includes an axial extension 70, a locking pin 71 provided on the inner wall of the axial extension 70, and an arc-shaped blocking part 72 provided at the lower end of the axial extension 70.

[0046] A pin hole 51, adapted to the locking pin 71, is provided at the corresponding position of the core tube 5. A first limiting part 61 and a second limiting part 62, respectively, are provided on the inner wall of the closure control tube 6 at the positions corresponding to the two separate sleeves 7, to restrict the axial movement of the separate sleeves 7. In the initial state, the separate sleeves 7 are located between the first limiting part 61 and the second limiting part 62. A spring 8 is located between the separate sleeves 7 and the inner wall of the closure control tube 6. The spring 8 provides radial force to the separate sleeves 7, causing them to tend to close radially.

[0047] When the core tube 5 moves to the point where the locking pin 71 is aligned with the pin hole 51, the split sleeve 6 moves radially under the force of the spring 8. The locking pin 71 engages with the pin hole 51, and the arc-shaped shielding part 72 also moves radially to cover the lower end of the core tube 5. Because the locking pin 71 and the pin hole 51 are engaged together, the closing control tube 6 and the core tube 5 are locked together, and the closing control tube 6 moves with the core tube 5.

[0048] In one possible design, the spring 8 is a helical spring, and the inner wall of the closing control tube 6 has a first radial post 63. The spring 8 is fitted onto the radial post 63, and the first radial post 63 is located between the first limiting part 61 and the second limiting part 62. In particular, the outer surface of the axial extension 70 has a second radial post 74 that is adapted to the first radial post 63, and the spring 8 is fitted onto the first radial post 63 and the second radial post 74.

[0049] In one possible design, the first limiting part 61 and the second limiting part 62 are fan-shaped thin plate structures.

[0050] In one possible design, the pin 71 is a rectangular post and the pin hole 51 is a rectangular hole.

[0051] In one possible design, the locking pin 71 is T-shaped, with rounded corners 710 at both ends of the horizontal portion of the T-shaped locking pin 71 to make it easier to engage with the pin hole 51.

[0052] In one possible design, the inner diameter of the axial extension 70 is equal to the outer diameter of the core tube 5.

[0053] In one possible design, the upper and lower inner walls of the closed control tube 6 are respectively equipped with an upper annular boss 64 and a lower annular boss 65. The inner diameter of the upper annular boss 64 and the lower annular boss 65 is consistent with the outer diameter of the core tube 5, which can play a certain role in removing chips from the outer wall of the core tube 5 and remove some of the coal chips attached to the outer wall of the core tube 5.

[0054] In one possible design, the outer tube includes a first outer tube 1 and a second outer tube 2. The upper end of the first outer tube 1 is threaded to the lower end of the second outer tube 2. The second outer tube 2 is used to install a pressure holding controller. The diameter of the outer surface of the closing control tube 6 is the same as the inner diameter of the first outer tube 1. The closing control tube 6 is fixedly fitted with the first outer tube 1.

[0055] Optionally, the upper inner wall of the first outer tube 1 has an annular boss to determine the axial position of the lower end of the valve seat 3. The valve seat 3 is installed inside the second outer tube 2, and its lower end abuts against the annular boss of the first outer tube 1.

[0056] The workflow of this embodiment:

[0057] 1. In the initial state: such as Figure 1 , Figure 8 As shown, the core tube 5 passes through the closed control tube 6 and the inner hole of the pressure holding controller, and the valve cover 4 is open and located in the annulus between the core tube 5 and the second outer tube 2;

[0058] Two separate sleeves 7 are restricted between the first limiting part 61 and the second limiting part 62 of the closing control tube 6. The spring 8 is compressed between the inner wall of the closing control tube 6 and the outer wall of the separate sleeves 7. The inner edge of the arc-shaped blocking part 72 is pressed tightly against the outer wall of the core tube 5 under the action of elastic force. Because of the presence of the arc-shaped blocking part 72, the two separate sleeves 7 are separated, and the lower end of the core tube 5 is open. At the same time, the locking pin 71 on the inner wall of the separate sleeve 7 does not contact the core tube 5, and the pin hole 51 on the core tube 5 is located below the locking pin 71.

[0059] 2. In working condition: such as Figure 2 As shown, after the core sampler completes coal sample collection, the core tube 5 moves upward under external force. When the lower end of the core tube 5 moves past the arc-shaped blocking part 72 of the split sleeve 7, the pin hole 51 and the locking pin 71 are also aligned. At this time, the supporting effect of the core tube 5 on the split sleeve 7 disappears, and the split sleeve 7 moves radially under the elastic force of the spring 8. The two arc-shaped blocking parts 72 move radially to close, and the two split sleeves 7 close and connect to form a closed ring, thus blocking the area around the opening of the core tube 5. The locking pin 71 of the split sleeve 7 also engages with the pin hole 51 of the core tube 5, locking the split sleeve 7 and the core tube 5 together. Figure 3 , Figure 9 As shown;

[0060] The core tube 5, along with the separate sleeve 7, continues to move upwards, and the valve cover 4 closes, forming a sealed pressure-holding space, such as... Figure 4 As shown. This embodiment does not show the complete pressure-holding space, but it has pressure-holding capability under actual conditions. This is a conventional technique in the field and will not be described in detail here.

[0061] Reinstall core tube 5, remove debris from inside the closure control tube 6, clean it thoroughly, and reinstall it in its initial position.

[0062] After the two separate sleeves 7 of this application are closed, it can prevent the core tube 5 from shedding debris around the inside, effectively preventing coal debris from falling onto the valve seat sealing surface, thereby improving the sealing performance of the valve seat and valve cover and ensuring the pressure holding performance of the core sampler.

[0063] In its initial state, this application utilizes two sets of limiting parts of the closed control tube to restrict the axial movement of the two separate casings 7 respectively, and combines the spring with the supporting effect of the outer wall of the core tube to achieve the control of the radial movement of the separate casings, making full use of the axial movement characteristics of the core tube itself. The above specific embodiments further illustrate the purpose, technical solution and beneficial effects of this application. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A core tube anti-chip-falling structure for a pressure-holding coring device, comprising an outer tube, a pressure-holding controller, and a core tube (5), wherein the pressure-holding controller is installed inside the outer tube, characterized in that: It also includes a closure control tube (6) and two separate sleeves (7), wherein the closure control tube (6) is coaxially mounted inside the outer tube and located below the pressure holding controller, and the core tube (5) can pass through the closure control tube (6); The split sleeve (7) includes an axial extension (70), a locking pin (71) provided on the inner wall of the axial extension (70), and an arc-shaped blocking part (72) provided at the lower end of the axial extension (70). A pin hole (51) adapted to the locking pin (71) is provided at the corresponding position of the core tube (5). The inner wall of the closing control tube (6) is provided with a first limiting part (61) and a second limiting part (62) for restricting the axial movement of the two separate sleeves (7) respectively. In the initial state, the pressure holding controller is turned on, and two separate sleeves (7) are symmetrically installed between the core tube (5) and the closing control tube (6). The separate sleeves (7) are located between the first limiting part (61) and the second limiting part (62). A compression spring (8) is provided between the outer wall of the separate sleeves (7) and the inner wall of the closing control tube (6). The inner edge of the arc-shaped shielding part (72) is pressed against the outer wall of the core tube (5) under the action of the spring (8). The lower end of the core tube (5) is open, and the pin hole (51) on the core tube (5) is located below the locking pin (71) of the separate sleeves (7). The inner wall of the closing control tube (6) has a first radial post (63), which is located between the first limiting part (61) and the second limiting part (62); the outer surface of the axial extension part (70) has a second radial post (74) that is adapted to the first radial post (63). In the initial state, the spring (8) is sleeved on the first radial post (63) and the second radial post (74). The axial extension (70) is a semi-circular tube; The upper and lower inner walls of the closed control tube (6) have an upper annular protrusion (64) and a lower annular protrusion (65), respectively. The inner diameters of the upper annular protrusion (64) and the lower annular protrusion (65) are the same as the outer diameter of the core tube (5). The two separate sleeves (7) form a closed ring after being closed and joined together; The pressure holding controller includes a valve seat (3) and a valve cover (4). The top of the valve seat (3) has a sealing surface that matches the valve cover (4). The valve seat (3) and the valve cover (4) may or may not have a permanent magnet (31).

2. The core tube anti-chip-falling structure of the pressure-holding coring device according to claim 1, characterized in that: The first limiting part (61) and the second limiting part (62) are fan-ring thin plate structures.

3. The core tube anti-chip-falling structure of the pressure-holding coring device according to claim 1, characterized in that: The locking pin (71) is T-shaped, and the horizontal part of the T-shaped locking pin (71) has rounded corners (710) at both ends.

4. The core tube anti-chip-falling structure of the pressure-holding coring device according to claim 1, characterized in that: The outer tube includes a first outer tube (1) and a second outer tube (2). The upper end of the first outer tube (1) is threadedly connected to the lower end of the second outer tube (2). The pressure holding controller is installed inside the second outer tube (2), and the closing control tube (6) is installed inside the first outer tube (1).

5. The method of using the core tube anti-chip-falling structure of the pressure-holding coring device as described in any one of claims 1-4, characterized in that: Includes the following steps: When the pressure holding controller is turned on, the core tube (5) passes through the closed control tube (6) and the inner hole of the pressure holding controller. The two separate sleeves (7) are restricted between the first limit part (61) and the second limit part (62) of the closed control tube (6). The spring (8) is compressed between the inner wall of the closed control tube (6) and the outer wall of the separate sleeve (7). The inner edge of the arc-shaped shield (72) is pressed tightly against the outer wall of the core tube (5) under the action of elasticity. The two separate sleeves (7) separate, the lower end of the core tube (5) is open, and the pin hole (51) on the core tube (5) is located below the locking pin (71). After the core sampler completes the collection, the core tube (5) moves upward under the action of external force. When the lower end of the core tube (5) moves past the arc-shaped shield (72) of the split casing (7), the pin hole (51) and the locking pin (71) are exactly aligned. At this time, the supporting effect of the core tube (5) on the split casing (7) disappears. The split casing (7) moves radially under the elastic force of the spring (8). The two arc-shaped shields (72) move radially to close, thus forming a closed ring. The locking pin (71) of the split casing (7) also locks into the pin hole (51) of the core tube (5). The split casing (7) and the core tube (5) are locked together. The core tube (5) continues to move upward with the split casing (7), and the pressure holding controller closes, forming a sealed pressure holding space.

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