A rock core grabbing device

Abstract

This invention relates to the field of pipeline core extraction technology and provides a core extraction device, comprising: a connector slidably disposed within a pipeline, one end of which has a connecting cavity; an elastic locking member disposed within the pipeline and located on the side of the connector away from the core; a driving member, the free end of which is connected to the elastic locking member for driving the elastic locking member to reciprocate along the axial direction of the pipeline; and a release ring slidably disposed within the connecting cavity. When the elastic locking member continues to penetrate deeper into the connecting cavity, it engages with the release ring, causing the elastic locking member to retract to the opening of the connecting cavity. This invention, through the cooperation of the elastic locking member, the connecting cavity, and the release ring, enables automatic core extraction and release without the need for a separate driving mechanism, significantly reducing the size of the core extraction device, broadening its applicability, and improving its reliability and service life.

Description

Technical Field

[0001] This invention belongs to the field of pipeline core technology, and particularly relates to a core grabbing device. Background Technology

[0002] In the field of pipeline core movement, pipeline core grasping has been widely used in many mechanized production processes and has demonstrated good performance. However, currently used pipeline core grasping devices generally require a separate drive mechanism to achieve the grasping and releasing actions of the core. This undoubtedly makes the entire pipeline core grasping device large in size. This method is only suitable for applications with large spaces. In some applications with limited space, the core grasping device is difficult to lay or even impossible to lay, resulting in the inability to successfully complete the grasping task. In addition, since core grasping devices sometimes need to work in high temperature and high pressure environments, the drive mechanism used for grasping and releasing is also prone to damage and failure. Summary of the Invention

[0003] This invention provides a core-grabbing device to solve the technical problem of low detection efficiency in existing core-grabbing devices.

[0004] This invention is implemented as follows: a core-grabbing device for retrieving core samples from a pipe, the core-grabbing device comprising:

[0005] A connector, which is slidably disposed inside the pipe, has a connecting structure for connecting a rock core at one end and a connecting cavity at the other end;

[0006] An elastic snap-fit ​​element is disposed inside the pipe and located on the side of the connector away from the rock core. The elastic snap-fit ​​element contracts when its outer wall is pressed against the inner wall of the cavity opening of the connecting cavity to snap into the interior of the connecting cavity.

[0007] A driving member, wherein the free end of the driving rod of the driving member is connected to the elastic snap-fit ​​member, for driving the elastic snap-fit ​​member to reciprocate along the axial direction of the pipe, so as to push the elastic snap-fit ​​member into the connecting cavity;

[0008] A release ring is slidably disposed within the connecting cavity. When the elastic locking member continues to penetrate deeper into the connecting cavity, the elastic locking member engages with the release ring, causing the elastic locking member to retract to the opening of the connecting cavity.

[0009] Preferably, the connector includes a connecting shaft and an end cap disposed at the end of the connecting shaft away from the rock core, the connecting shaft and the end cap enclosing the connecting cavity, and the end cap having an opening for the connecting cavity.

[0010] Preferably, the end cap is threadedly connected to the connecting shaft.

[0011] Preferably, the elastic snap-fit ​​component includes a plurality of snap-fits arranged in a circumferential array on the free end of the drive rod of the drive component. The snap-fits can retract into the drive rod after being subjected to external pressure and can reset when the external pressure is removed.

[0012] Preferably, the inner wall of the end of the release ring near the opening of the connecting cavity extends outward to form an annular protrusion, the thickness of the annular protrusion gradually increases from both ends to the middle, and the outer diameter of the elastic snap-fit ​​member gradually increases from both ends to the middle.

[0013] Preferably, the minimum diameter of the annular protrusion is smaller than the diameter of the opening of the connecting cavity.

[0014] Preferably, the distance from the minimum diameter of the annular protrusion to the end face of the release ring near the opening of the connecting cavity is less than the distance from the maximum outer diameter of the elastic snap-fit ​​member to its rear end face.

[0015] Preferably, the frictional force between the elastic locking member and the inner wall of the release ring is greater than the frictional force between the outer wall of the release ring and the inner wall of the connecting cavity.

[0016] Preferably, the driving member is disposed outside the pipe, the driving rod of the driving member extends into the inside of the pipe, and a return spring is provided between the driving rod of the driving member and the outer wall of the pipe.

[0017] Preferably, the driving rod of the driving member is provided with a limiting baffle, which is located inside the pipe and is used to prevent the driving rod of the driving member from falling out of the pipe.

[0018] The beneficial effects achieved by this invention are as follows: through the cooperation of the elastic snap-fit ​​component, the connecting cavity and the release ring, the core grabbing and releasing action can be automatically completed without setting a separate drive mechanism, which greatly reduces the size of the core grabbing device, has a wider range of applications, and also greatly improves the core grabbing device's ability to withstand high temperature and high pressure, thereby improving the reliability and service life of the core grabbing device. Attached Figure Description

[0019] Figure 1 This is a diagram showing the usage status of the core-grabbing device in Embodiment 1 of the present invention;

[0020] Figure 2 This is a perspective view of the core-grabbing device in Embodiment 1 of the present invention;

[0021] Figure 3 This is a cross-sectional view of the rock core grabbing device in the first embodiment of the present invention in its usage state;

[0022] Figure 4for Figure 3 The enlarged view of point A in the middle. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0024] Example 1

[0025] Please see Figures 1-4 The figure shows a core-grabbing device according to Embodiment 1 of the present invention, used to grab a core (not shown) from a pipe 200. The core-grabbing device includes a connector 10, an elastic snap-fit ​​member 20, a driving member 30, and a release ring 40. The connector 10 is slidably disposed in the pipe 200. One end of the connector 10 is provided with a connecting structure 11 for connecting the core, and the other end is provided with a connecting cavity 12. The elastic snap-fit ​​member 20 is disposed in the pipe 200 and located on the side of the connector 10 away from the core. When the outer wall of the elastic snap-fit ​​member 20 is pressed against the inner wall of the cavity opening 121 of the connecting cavity 12, it contracts to snap into the connecting cavity 12, completing the core-grabbing action. At this time, driven by the driving member 30, the elastic snap-fit ​​member 20 can bring the connector 10 out of the pipe 200, thereby grabbing the core from the pipe 200. The driving component 30 can specifically be a hydraulic rod. The driving component 30 is located outside the pipe 200, and its driving rod 31 extends into the pipe 200. The free end of the driving rod 31 is connected to an elastic locking component 20, which drives the elastic locking component 20 to reciprocate axially along the pipe 200, pushing the elastic locking component 20 into the connecting cavity 12. A release ring 40 is slidably disposed within the connecting cavity 12. When the elastic locking component 20 continues to penetrate deeper into the connecting cavity 12, it engages with the release ring 40, causing the elastic locking component to retract and exit through the cavity opening 121 of the connecting cavity 12, thus completing the core detachment action.

[0026] Specifically, the connector 10 includes a connecting shaft 13 and an end cap 14 located at the end of the connecting shaft 13 furthest from the rock core. The connecting shaft 13 and the end cap 14 enclose a connecting cavity 12, and the end cap 14 has an opening 121 for the connecting cavity 12. The end cap 14 is threadedly connected to the connecting shaft 13, thus making the end cap 14 detachable for easy installation, maintenance, or replacement of the release ring 40 inside the connecting cavity 12. Furthermore, when the elastic locking member 20 pulls the connector 10 outward, the elastic locking member 20 abuts against the inner side of the end cap 14. At this time, since the end cap 14 and the connecting shaft 13 are screwed together, the connecting shaft 13 will move outward synchronously with the end cap 14, thereby grabbing the rock core out of the pipe 200. In some alternative embodiments, the connecting structure 11 for connecting the rock core can be a screwed structure, a snap-fit ​​structure, etc. For example, in this embodiment, the connecting structure 11 for connecting the rock core is specifically a threaded hole, so that it can be connected to the thread at the end of the rock core, thereby realizing the integral connection between the connector 10 and the rock core.

[0027] Furthermore, the elastic locking member 20 includes a plurality of spring clips 21, which are arranged in a circumferential array on the free end of the drive rod 31 of the drive member 30. The outer walls of each spring clip 21 are coplanar. When subjected to external pressure, the spring clips 21 can retract into the drive rod 31 and can reset when the external pressure is removed. For example, the spring clips 21 can be slidably embedded in the drive rod 31 through a groove or other structure provided on the drive rod 31, and a spring is provided between the bottom of the spring clip 21 and the drive rod 31 to achieve the reset of the spring clips 21. Specifically, the outer diameter of the elastic locking member 20 gradually increases from both ends to the middle, thereby forming inclined surfaces at both the front and rear ends of the spring clips 21. The length of the front inclined surface is longer than that of the rear inclined surface. Under the action of the inclined surfaces, the spring clips 21 can better cooperate with the cavity opening 121 of the connecting cavity 12, thereby allowing the spring clips 21 to better engage into or disengage from the connecting cavity 12. In addition, the end of the drive rod 31 of the drive member 30 is screwed with a pull rod end cap 34, and the front end of the spring clip 21 extends at least partially into the inside of the pull rod end cap 34, which can limit the spring clip 21 from opening outward due to elastic inertia.

[0028] In this design, an annular protrusion 41 extends outward from the inner wall of the end of the release ring 40 near the cavity opening 121 of the connecting cavity 12. The thickness of the annular protrusion 41 gradually increases from both ends towards the middle, and the minimum diameter of the annular protrusion 41 is smaller than the diameter of the cavity opening 121 of the connecting cavity 12. The distance from the minimum diameter of the annular protrusion 41 to the end face of the release ring 40 near the cavity opening 121 of the connecting cavity 12 is smaller than the distance from the maximum outer diameter of the elastic retaining member 20 to its rear end face. Specifically, for example... Figure 4As shown, point A is defined as the minimum diameter of the annular protrusion 41, and the distance from point A to the end face of the release ring 40 near the cavity opening 121 of the connecting cavity 12 is d1. Point B is defined as the maximum outer diameter of the elastic locking member 20, and the distance from point B to the rear end face of the elastic locking member 20 is d2. Then, d1 < d2. This ensures that when the release ring 40 abuts against the end cap 14 and point A, the minimum diameter of the annular protrusion 41, moves to engage with point B, the maximum outer diameter of the elastic locking member 20, at least part of the rear end of the elastic locking member 20 enters the cavity opening 121 of the connecting cavity 12. This ensures that the elastic locking member 20 can smoothly detach from the connecting member 10 before the spring clip 21 completely disengages from the release ring 40.

[0029] Furthermore, the friction between the elastic locking member 20 and the inner wall of the release ring 40 is greater than the friction between the outer wall of the release ring 40 and the inner wall of the connecting cavity 12. Thus, when the elastic locking member 20 moves outward, the release ring 40 will first move outward synchronously with the elastic locking member 20. After the release ring 40 abuts against the end cap 14, the release ring 40 will no longer move outward. At this time, the elastic locking member 20 will move outward relative to the release ring 40. At this time, the elastic locking member 20 will be compressed, and thus smoothly disengage from the release ring 40 and disengage from the cavity opening 121 of the connecting cavity 12, completing the core detachment action.

[0030] In a preferred embodiment, a return spring 32 is provided between the drive rod 31 of the drive member 30 and the outer wall of the pipe 200. When the drive rod 31 moves to the left to push the elastic snap-fit ​​member 20 inward, the return spring 32 is compressed. When the hydraulic force of the drive member 30 is removed, the elastic snap-fit ​​member 20 will automatically and quickly reset under the action of the return spring 32. A limiting baffle 33 is provided on the drive rod 31 of the drive member 30. The limiting baffle 33 is located inside the pipe 200 and is used to prevent the drive rod 31 of the drive member 30 from falling out of the pipe 200.

[0031] In practical use, the drive rod 31 is first driven by the drive component 30 to move to the right, the return spring 32 is compressed, and the spring clip 21 is pushed to the right (that is, moved inward) by the drive rod 31. Due to the compressibility of the spring clip 21 itself and the large slope of the front end structure of the spring clip 21, it is easy to be inserted into the connecting cavity 12. After being inserted, the drive component 30 drives the drive rod 31 to move to the left (that is, moved outward). The rear end of the spring clip 21 abuts against the end cap 14, thereby pulling the connecting component 10 to move to the left together, so as to drive the rock core under the high temperature and high pressure environment underground to move outward, thereby achieving the effect of automatically extracting the rock core.

[0032] After the core is removed, a subsequent disengagement action is required. The drive rod 31 moves to the right at this time. The spring clip 21 will first push the release ring 40 to abut against the bottom of the connecting cavity 12. Then the spring clip 21 continues to move to the right. Due to the elasticity of the spring clip 21 and the rightward inclination, the spring clip 21 will enter the release ring 40 as it continues to move to the right. After that, the drive component 30 stops applying force. The elasticity of the compressed return spring 32 drives the drive rod 31 to move to the left, which can pull the release ring 40 to the left until the release ring 40 contacts the end cap 14. Due to the sufficient inclination of the internal structure of the release ring 40, the spring clip 21 can be compressed. Thus, the drive rod 31 continues to move to the left, which can disengage the spring clip 21 from the inside of the connector, thereby achieving the effect of automatic disengagement.

[0033] In summary, the core grabbing device in this embodiment has the following beneficial effects: through the cooperation of the elastic snap-fit ​​component, the connecting cavity, and the release ring, the core grabbing and releasing actions can be automatically completed without setting a separate drive mechanism, which greatly reduces the size of the core grabbing device and has a wider range of applications. At the same time, since this device only has a drive component located outside the pipeline, it greatly improves the core grabbing device's ability to withstand high temperature and high pressure, and improves the reliability and service life of the core grabbing device.

[0034] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0035] 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, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A core-grabbing device for retrieving core samples from a pipe, characterized in that, The core grabbing device includes: A connector, which is slidably disposed inside the pipe, has a connecting structure for connecting a rock core at one end and a connecting cavity at the other end; An elastic snap-fit ​​element is disposed inside the pipe and located on the side of the connector away from the rock core. The elastic snap-fit ​​element contracts when its outer wall is pressed against the inner wall of the cavity opening of the connecting cavity to snap into the cavity. The outer diameter of the elastic snap-fit ​​element gradually increases from both ends to the middle to form a slope at both the front and rear ends of the snap-fit ​​element, wherein the length of the front slope is longer than the length of the rear slope. A driving member, wherein the free end of the driving rod of the driving member is connected to the elastic snap-fit ​​member, for driving the elastic snap-fit ​​member to reciprocate along the axial direction of the pipe, so as to push the elastic snap-fit ​​member into the connecting cavity; A release ring is slidably disposed within the connecting cavity. When the elastic locking member continues to penetrate deeper into the connecting cavity, the elastic locking member engages with the release ring, causing the elastic locking member to retract to the opening of the connecting cavity. The inner wall of the release ring near the opening of the connecting cavity extends outward with an annular protrusion, the thickness of which gradually increases from both ends toward the middle.

2. The core-grabbing device according to claim 1, characterized in that, The connector includes a connecting shaft and an end cap disposed at the end of the connecting shaft away from the rock core. The connecting shaft and the end cap enclose the connecting cavity, and the end cap is provided with the opening of the connecting cavity.

3. The core-grabbing device according to claim 2, characterized in that, The end cap is threadedly connected to the connecting shaft.

4. The core-grabbing device according to claim 1, characterized in that, The elastic snap-fit ​​component includes a plurality of snap-fits arranged in a circumferential array on the free end of the drive rod of the drive component. The snap-fits can retract into the drive rod after being subjected to external pressure and can reset when the external pressure is removed.

5. The core-grabbing device according to claim 1, characterized in that, The minimum diameter of the annular protrusion is smaller than the diameter of the opening of the connecting cavity.

6. The core-grabbing device according to claim 1, characterized in that, The distance from the minimum diameter of the annular protrusion to the end face of the release ring near the opening of the connecting cavity is less than the distance from the maximum outer diameter of the elastic snap-fit ​​member to its rear end face.

7. The core-grabbing device according to claim 1, characterized in that, The frictional force between the elastic snap-fit ​​element and the inner wall of the release ring is greater than the frictional force between the outer wall of the release ring and the inner wall of the connecting cavity.

8. The core-grabbing device according to any one of claims 1-7, characterized in that, The driving component is disposed outside the pipe, the driving rod of the driving component extends into the inside of the pipe, and a return spring is provided between the driving rod of the driving component and the outer wall of the pipe.

9. The core-grabbing device according to claim 8, characterized in that, The driving rod of the driving component is provided with a limiting baffle plate, which is located inside the pipe and is used to prevent the driving rod of the driving component from falling out of the pipe.

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