Wireline coring fishing device

Abstract

The present disclosure relates to the technical field of deep-sea drilling equipment, and provides a rope coring fishing device, which comprises a joint piece, a positioning piece, a limiting shaft, a valve seat, a movable valve head, a locking piece and a fishing spear head; the positioning piece is fixedly connected with the joint piece and is sleeved with a recovery pipe; the limiting shaft is movably arranged in the positioning piece; the valve seat is arranged in the recovery pipe and movably connected with the recovery pipe, and one end of the limiting shaft is fixedly connected with the valve seat; the movable valve head is movably arranged in the recovery pipe and connected with the valve seat through a second elastic piece; the locking piece is movably arranged on the inner wall of the recovery pipe and can reciprocate along the radial direction of the recovery pipe; the fishing spear head has a matching part for locking cooperation with the locking piece; when the fishing spear head is butted with the movable valve head, the movable valve head is pressed and drives the valve seat to move, and the first elastic piece synchronously drives the recovery pipe to slide and press the locking piece, so that the locking piece locks and fixes the matching part. The rope coring fishing device has the advantages of high butting success rate and good butting locking safety.

Description

Technical Field

[0001] This disclosure relates to the field of deep-sea drilling equipment technology, and in particular to a wireline coring and retrieval device. Background Technology

[0002] In deep-sea drilling operations, especially in the exploration of natural gas hydrates or deep-sea mineral resources, wireline coring technology is widely used in deep-sea drilling rigs. Traditional wireline coring systems mainly consist of a coring rope, a retrieval device, and a core sample recovery system. During operations, the rope must ensure the rapid and accurate retrieval of the drilled core sample from the seabed, which is particularly challenging in the deep-sea environment.

[0003] Current deep-sea drilling rigs primarily use rope-based retrieval systems, relying on ropes and winches within the rig to retrieve rock cores. While this can accomplish the task to some extent, in the deep-sea environment, especially at great depths, existing equipment faces multiple challenges such as changes in seabed topography and ocean currents, making it prone to problems like detachment. This not only leads to retrieval failure but also increases the risk of equipment damage.

[0004] Therefore, developing a wireline coring and retrieval device suitable for deep-sea drilling rigs has significant practical implications and application value. Summary of the Invention

[0005] This disclosure provides a rope core sampling and retrieval device to address the problems of docking difficulties and easy detachment during the retrieval process in existing deep-sea drilling rope retrieval devices.

[0006] The rope core retrieval device provided in this embodiment includes a connector, a positioning component, a limiting shaft, a valve seat, a movable valve head, a locking component, and a retrieval spearhead;

[0007] The connector is provided with connection holes for connecting to a rope;

[0008] One end of the positioning component is fixedly connected to the connector component, and the other end is movably fitted with a recycling tube.

[0009] The limiting shaft is movably disposed in the positioning component;

[0010] The valve seat is disposed in the recovery tube and is movably connected to the recovery tube through the first elastic member, and the valve seat is also fixedly connected to one end of the limiting shaft;

[0011] The movable valve head is movably disposed in the recovery pipe and connected to the valve seat via a second elastic element;

[0012] The locking element is movably disposed on the inner wall of the recovery tube and can reciprocate radially along the recovery tube;

[0013] The spearhead is used to connect with the object to be retrieved, and has a mating part for the locking mechanism to engage.

[0014] When the spearhead aligns with the movable valve head, the movable valve head is compressed and drives the valve seat to move. Simultaneously, the first elastic element drives the recovery tube to slide and squeeze the locking element, thereby locking and fixing the mating part.

[0015] In one embodiment, the positioning member has a limiting hole along its own radial direction;

[0016] The limiting shaft has a limiting part that is inserted into the limiting hole;

[0017] When the limiting shaft moves synchronously with the valve seat, the limiting part can be limited to move within the limiting hole and can be blocked by both ends of the limiting hole.

[0018] In one possible implementation, a reset member is further included, which is sleeved around the periphery of the positioning member;

[0019] The reset member can slide relative to the positioning member along the axial direction and press the limiting part to move in the limiting hole, so that the limiting shaft presses the valve seat, the movable valve head and the locking member to reset respectively.

[0020] In one embodiment, the locking element includes a plurality of locking balls spaced around the inner wall of the recovery tube;

[0021] The inner wall of the recovery tube is also provided with a recess for accommodating the locking ball;

[0022] When the recessed portion slides along the recycling tube, it can press the locking member radially along the recycling tube, so that the locking member moves toward the axis of the recycling tube and locks the mating part.

[0023] In one possible embodiment, the positioning element further includes a guide tube;

[0024] The guide tube is fixedly connected to the positioning component;

[0025] The recovery tube is at least partially slidably sleeved on the outer wall of the guide tube, and the valve seat and the movable valve head are at least partially slidably plugged into the inner wall of the guide tube.

[0026] In one embodiment, an annular gap is further formed between the guide tube and the recovery tube;

[0027] The first elastic element is a first compression spring disposed in the annular gap, and one end of the first compression spring is connected to the recovery pipe, and the other end is connected to the valve seat.

[0028] In one embodiment, the valve seat and the movable valve head are respectively partially plugged into both ends of the guide tube, and a receiving gap is formed between the valve seat and the movable valve head;

[0029] The second elastic element is a second compression spring disposed in the accommodating gap, and one end of the second compression spring is connected to the valve seat, and the other end is connected to the movable valve head.

[0030] In one embodiment, the guide tube is further provided with a through-hole for the locking component to move through;

[0031] The movable valve head plug is installed in the peripheral wall of the guide tube and is also provided with a blocking part for preventing the movement of the locking component;

[0032] When the movable valve head slides back and forth in the guide tube, the blocking part can open or close the through port accordingly.

[0033] In one embodiment, the movable valve head has an insertion portion at the end corresponding to the spearhead;

[0034] One end of the spearhead is formed into a cone-shaped portion that is inserted and connected to the receiving part.

[0035] In one embodiment, the mating portion includes an annular retaining flange located at the end of the conical portion;

[0036] The locking element abuts against the annular retaining edge along the radial direction of the spearhead.

[0037] The technical solution provided in this disclosure has the following advantages compared with related technologies:

[0038] The rope coring and retrieval device provided in this embodiment has a simple structure. During retrieval docking, it can efficiently and quickly achieve a reliable locking connection between the rope and the drilling coring device under complex deep-sea conditions by combining the first spring system formed by the movable valve head, the second elastic element, and the valve seat; the second spring system formed by the valve seat, the first elastic element, and the recovery tube; and the mechanical locking mechanism formed by the locking element and the mating part in the retrieval spearhead. This significantly improves the success rate and safety of deep-sea retrieval operations.

[0039] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this disclosure, nor is it intended to limit the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0040] The above and other objects, features, and advantages of this disclosure will become readily apparent from the following detailed description of exemplary embodiments, taken in conjunction with the accompanying drawings. Several embodiments of this disclosure are illustrated in the drawings by way of example and not limitation, in which:

[0041] In the accompanying drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

[0042] Figure 1 A perspective half-sectional view of the rope coring and retrieval device provided in an embodiment of this disclosure is shown;

[0043] Figure 2 A perspective view of the rope coring and retrieval device provided in an embodiment of this disclosure is shown;

[0044] Figure 3 A cross-sectional view of the rope coring and retrieval device provided in an embodiment of this disclosure in an unconnected state is shown;

[0045] Figure 4 A cross-sectional view showing the connection state of the rope coring and retrieval device provided in an embodiment of this disclosure is shown;

[0046] Figure 5 A cross-sectional view of the rope coring and retrieval device provided in an embodiment of this disclosure in its reset state is shown;

[0047] Figure 6 A partially enlarged view of the rope coring and retrieval device provided in an embodiment of this disclosure is shown.

[0048] The following are the labels in the diagram: 1. Connector; 2. Positioning component; 21. Recovery tube; 211. Recessed part; 22. Limiting hole; 23. Guide tube; 231. Through port; 3. Limiting shaft; 31. Limiting part; 4. Valve seat; 41. First elastic component; 5. Movable valve head; 51. Second elastic component; 52. Blocking part; 6. Locking component; 7. Spear head; 71. Conical part; 72. Mating part; 8. Reset component. Detailed Implementation

[0049] To make the objectives, features, and advantages of this disclosure more apparent and understandable, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0050] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0051] Combination Figure 1 and Figure 2 As shown, this embodiment of the present disclosure provides a rope core retrieval device, which includes a connector 1, a positioning component 2, a limiting shaft 3, a valve seat 4, a movable valve head 5, a locking component 6, and a retrieval spearhead 7. The connector 1 has a connection hole for connecting with a rope. One end of the positioning component 2 is fixedly connected to the connector 1, and the other end is movably fitted with a recovery tube 21. The limiting shaft 3 is movably disposed in the positioning component 2. The valve seat 4 is disposed in the recovery tube 21 and is movably connected to the recovery tube 21 through a first elastic component 41, and the valve seat 4 is also fixedly connected to one end of the limiting shaft 3. The movable valve head 5 is movably disposed in the recovery tube 21 and is connected to the valve seat 4 through a second elastic component 51. The locking component 6 is movably disposed on the inner wall of the recovery tube 21 and can reciprocate radially along the recovery tube 21. The retrieval spearhead 7 is used to connect with the object to be retrieved and has a mating part 72 for the locking component 6 to engage.

[0052] When the spearhead 7 docks with the movable valve head 5, the movable valve head 5 is pressed and drives the valve seat 4 to move. The first elastic member 41 simultaneously drives the recovery tube 21 to slide and squeeze the locking member 6, and the locking member 6 locks and fixes the mating part 72.

[0053] The wireline coring and retrieval device provided in this embodiment can be used in wireline coring and retrieval tasks of deep-sea drilling rigs, and its use will be described using this as an example.

[0054] Before using the rope coring retrieval device, the retrieval spearhead 7 can be fixedly connected to the drilling coring device so that the retrieval spearhead 7 can be located at the same retrieval depth as the drilling coring device after drilling is completed. Then, the retrieval rope is connected to the corresponding connection hole in the connector 1, and the rope coring retrieval device is gradually lowered through the retrieval rope until the movable valve head 5 and the retrieval spearhead 7 to be retrieved are at similar depths and docking is performed.

[0055] Combination Figure 3 In further detail, at this time, the spearhead 7 and the movable valve head 5 are not connected. Under the action of its own weight, the rope core retrieval device can make the first elastic element 41 and the second elastic element 51 both be in a state of being compressed and storing elastic potential energy. The locking element 6 on the inner wall of the recovery tube 21 is in a radial free position and does not produce a locking effect.

[0056] Combination Figure 4In further detail, when the rope coring retrieval device enters the docking and locking stage, the retrieval spearhead 7 can correspondingly press the movable valve head 5 upward, causing the movable valve head 5 to move further upward and the second elastic member 51 to be further compressed and store elastic potential energy. This causes the valve seat 4 to drive the limiting shaft 3 to move upward together. At this time, the movable valve head 5, the second elastic member 51, and the valve seat 4 form a first spring system. At the same time, the first elastic member 41 can correspondingly extend and release elastic potential energy, causing the recovery tube 21 to slide downward relative to the valve seat 4. The valve seat 4, the first elastic member 41, and the recovery tube 21 form a second spring system. During the downward sliding process of the recovery tube 21, it can also simultaneously squeeze the locking member 6 and cause the locking member 6 to move radially along the recovery tube 21 toward the mating part 72 in the retrieval spearhead 7 until the mating part 72 is locked and fixed. In this way, a reliable mechanical locking connection can be formed between the retrieval spearhead 7 and the retrieval rope. Finally, the retrieval rope is wound up and lifted, and the rope coring retrieval device, the drilling coring device, and the drill core sample can be retrieved upward simultaneously.

[0057] The rope core-rearing device has a simple structure and can efficiently and quickly lock the rope to the drilling core-rearing device under complex deep-sea conditions through the synergistic effect of two composite spring systems (i.e., the first spring system and the second spring system mentioned above) and a mechanical locking mechanism (the locking part 6 and the mating part 72 in the retrieval spearhead 7 form a mechanical locking mechanism). This significantly improves the success rate and safety of deep-sea salvage operations.

[0058] In one embodiment, the positioning member 2 has a limiting hole 22 along its own radial direction; the limiting shaft 3 has a limiting part 31 inserted into the limiting hole 22; wherein, when the limiting shaft 3 moves synchronously with the valve seat 4, the limiting part 31 can be limited to move in the limiting hole 22 and can be blocked by both ends of the limiting hole 22.

[0059] Specifically, in combination Figure 1 and Figure 2 In further detail, a limiting hole 22 is formed in the radial direction of the positioning member 2. The limiting hole 22 can be, but is not limited to, a rectangular hole, an oblong hole, etc., and a limiting part 31 can be correspondingly protruded from the peripheral wall of the limiting shaft 3 and inserted into the limiting hole 22. In this way, when the limiting shaft 3 moves upward with the valve seat 4, the limiting part 31 can slide within the limiting hole 22 and can be stopped and limited by the top end of the limiting hole 22 (corresponding to...). Figure 4 The middle limiting part 31 is located at the position of the limiting hole 22, thereby realizing the function of limiting the maximum upward stroke of the limiting shaft 3 and the valve seat 4, and avoiding excessive upward movement of the valve seat 4 and the limiting shaft 3 when the spearhead 7 is connected to the movable valve head 5.

[0060] In one embodiment, the rope core retrieval device further includes a reset member 8 sleeved around the periphery of the positioning member 2; the reset member 8 can slide relative to the positioning member 2 along the axial direction and press the limiting part 31 to move in the limiting hole 22, so that the limiting shaft 3 presses the valve seat 4, the movable valve head 5 and the locking member 6 to reset respectively.

[0061] Specifically, in combination Figure 4 and Figure 5 In further detail, when the wireline coring device and the core sample are simultaneously retrieved upwards, and it is necessary to detach the wireline coring device from the core sample, simply slide the reset piece 8 downwards along the axial direction of the positioning piece 2 (specific implementation methods may include: fixing the reset piece 8 and continuing to pull the positioning piece 2 and the connector 1 upwards; or fixing the positioning piece 2 and the connector 1 and pushing the reset piece 8 downwards). This allows the reset piece 8 to press the limiting part 31 downwards within the limiting hole 22 until it reaches the lowest point of the limiting hole 22 (corresponding to...). Figure 5 The middle limiting part 31 is located at the limiting hole 22), and the limiting shaft 3 can move downward synchronously with the limiting part 31, and squeeze the valve seat 4 and the movable valve head 5 to move downward and reset. Moreover, during the downward resetting process of the movable valve head 5, it can also move the locking part 6 away from the mating part 72 in the retrieval spearhead 7 to reset and unlock. In this way, the movable valve head 5 and the retrieval spearhead 7 can be disconnected, so that the locking state of the rope core retrieval device is completely released, and the rope core retrieval device can achieve the beneficial effect of quick and reliable disengagement.

[0062] In one embodiment, the locking member 6 includes a plurality of locking balls spaced around the inner wall of the recovery tube 21; the inner wall of the recovery tube 21 is also provided with a recess 211 for accommodating the locking balls; wherein, when the recess 211 slides with the recovery tube 21, it can squeeze the locking member 6 radially along the recovery tube 21, so that the locking member 6 moves toward the axis of the recovery tube 21 and locks the mating part 72.

[0063] Specifically, in combination Figure 1 and Figure 2 In further detail, the locking element 6 is specifically configured as multiple locking balls spaced around the inner wall of the recovery tube 21. Furthermore, a recess 211 adapted to the curvature of the locking balls and used to accommodate them is provided in the inner wall of the recovery tube 21. Thus, when the recovery tube 21 moves the recess 211 downwards synchronously, the recess 211 can squeeze the locking element 6 radially along the recovery tube 21, thereby enabling the multiple locking balls to move synchronously toward the axis of the recovery tube 21 and lock the mating part 72 in the spearhead 7 accordingly.

[0064] The specific arrangement of the aforementioned locking component 6 and the recovery tube 21 has a structure that enables stable locking at multiple points with the mating part 72 in the spearhead 7.

[0065] In one embodiment, the positioning member 2 further includes a guide tube 23; the guide tube 23 is fixedly connected to the positioning member 2; the recovery tube 21 is at least partially slidably sleeved on the outer wall of the guide tube 23, and the valve seat 4 and the movable valve head 5 are at least partially slidably plugged into the inner wall of the guide tube 23.

[0066] Specifically, in combination Figure 3 and Figure 4 In further detail, the guide tube 23 can be fixedly connected to the bottom end of the positioning member 2, and the recovery tube 21 is slidably sleeved on the outer wall of the guide tube 23. The valve seat 4 and the movable valve head 5 are slidably plugged into the inner wall of the guide tube 23. In this way, both the inner and outer walls of the guide tube 23 can play a guiding role, ensuring that the recovery tube 21, the valve seat 4 and the movable valve head 5 can move up and down along a precise trajectory.

[0067] In one embodiment, an annular gap is formed between the guide tube 23 and the recovery tube 21; the first elastic member 41 is a first compression spring disposed in the annular gap, and one end of the first compression spring is connected to the recovery tube 21, and the other end is connected to the valve seat 4.

[0068] Specifically, in combination Figure 3 In further detail, a first elastic element 41 is provided in the annular gap formed between the guide tube 23 and the recovery tube 21. The first elastic element 41 is configured as a first compression spring with one end connected to the recovery tube 21 and the other end connected to the valve seat 4. In this way, when the rope core retrieval device is in normal condition, the recovery tube 21 can have a preliminary downward pressing tendency of the locking element 6 under the elastic action of the first compression spring, so that the recovery tube 21 can form a stable installation limit on the locking element 6, thereby preventing the locking element 6 from accidentally falling off the inner wall of the recovery tube 21.

[0069] In one embodiment, the valve seat 4 and the movable valve head 5 are respectively partially inserted into both ends of the guide tube 23, and a receiving gap is formed between the valve seat 4 and the movable valve head 5; the second elastic member 51 is a second compression spring disposed in the receiving gap, and one end of the second compression spring is connected to the valve seat 4, and the other end is connected to the movable valve head 5.

[0070] Specifically, in combination Figure 3To explain in more detail, the valve seat 4 and the movable valve head 5 are respectively partially inserted into both ends of the guide tube 23, and a receiving gap is formed between the valve seat 4 and the movable valve head 5 for accommodating the second elastic member 51. The second elastic member 51 is set as a second compression spring located in the receiving gap. In this way, when the rope core retrieval device is in normal condition, the second compression spring can apply a downward elastic squeezing force to the movable valve head 5, so that the movable valve head 5 can be stably located at the bottom end of the guide tube 23 in normal condition and lock the locking member 6 to prevent the locking member 6 from accidentally falling out through the guide tube 23.

[0071] In one embodiment, the guide tube 23 is provided with a through-hole 231 for the locking member 6 to move through; the movable valve head 5 is plugged into the peripheral wall of the guide tube 23 and is provided with a blocking part 52 for blocking the movement of the locking member 6; wherein, when the movable valve head 5 slides back and forth in the guide tube 23, the blocking part 52 can open or close the through-hole 231 accordingly.

[0072] Specifically, in combination Figure 6 In further detail, through-holes 231 for the movement and shuttle of the locking element 6 can be opened one by one in the wall of the guide tube 23, and a blocking part 52 for blocking the movement of the locking element 6 is correspondingly provided in the peripheral wall of the guide tube 23 where the movable valve head 5 is plugged. In this way, when the rope core retrieval device is in normal condition, the outer side of the locking element 6 is squeezed by the recovery tube 21 and the inner side is pressed by the blocking part 52. The two are balanced with each other, thereby ensuring that the locking element 6 can be stably limited and set between the recovery tube 21 and the guide tube 23.

[0073] Furthermore, when the movable valve head 5 slides upward in the guide tube 23, the blocking part 52 no longer blocks the through-hole 231. At this time, the locking member 6 can at least partially pass through the through-hole 231 in the guide tube 23 and lock with the mating part 72 in the spearhead 7. When the movable valve head 5 slides downward in the guide tube 23, the blocking part 52 can slide downward and resume blocking the through-hole 231. At this time, the locking member 6 can move back to the recovery tube 21 and the guide tube 23 under the squeezing action of the blocking part 52, thereby unlocking and separating the locking member 6 from the mating part 72 in the spearhead 7.

[0074] In one embodiment, a receiving portion is provided at one end of the movable valve head 5 and the corresponding end of the spearhead 7; one end of the spearhead 7 forms a conical portion 71 that is inserted and connected with the receiving portion.

[0075] Specifically, in combination Figure 3 and Figure 4In further detail, a recessed insertion portion can be provided at the corresponding end (bottom) of the movable valve head 5 and the spearhead 7, and a protruding conical portion 71 can be provided at the top of the spearhead 7 to connect with the insertion portion. In this way, when the spearhead 7 and the movable valve head 5 are pressed together, the conical portion 71 can be gradually inserted into the insertion portion at the bottom of the movable valve head 5. Even if there is a certain positional deviation between the movable valve head 5 and the spearhead 7 in the vertical direction, the conical portion 71 can automatically center itself during the gradual insertion into the insertion portion, thereby improving the positional error tolerance and docking success efficiency when the spearhead 7 and the movable valve head 5 are docked.

[0076] In one embodiment, the mating part 72 includes an annular retaining edge located at the end of the conical part 71; the locking member 6 engages with the annular retaining edge radially along the spearhead 7.

[0077] Specifically, in combination Figure 3 and Figure 4 In further detail, the mating part 72 is configured as an annular retaining edge located at the end of the conical part 71, and the annular retaining edge can protrude radially from the spearhead 7 body. In this way, the mating part 72 can form a stepped constriction structure with the spearhead 7 body, so that the locking member 6 abuts and locks against the lower edge of the annular retaining edge radially, ensuring that the locking member 6 can stably and reliably lock and fix the spearhead 7.

[0078] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means two or more, unless otherwise explicitly specified.

[0079] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A rope core retrieval device, characterized in that, include: The connector (1) has a connection hole for connecting with a rope; The positioning component (2) is fixedly connected to the connector component (1) at one end and the recycling tube (21) is movably sleeved at the other end. The limiting shaft (3) is movably disposed in the positioning member (2); A valve seat (4) is disposed in the recovery pipe (21) and is movably connected to the recovery pipe (21) through a first elastic member (41), and the valve seat (4) is also fixedly connected to one end of the limiting shaft (3); The movable valve head (5) is movably disposed in the recovery pipe (21) and connected to the valve seat (4) through the second elastic element (51); The locking element (6) is movably disposed on the inner wall of the recycling tube (21) and can reciprocate radially along the recycling tube (21); The spearhead (7) is used to connect with the object to be retrieved and has a mating part (72) for locking and engaging with the locking member (6). When the spearhead (7) docks with the movable valve head (5), the movable valve head (5) is pressed and drives the valve seat (4) to move. The first elastic member (41) synchronously drives the recovery tube (21) to slide and squeeze the locking member (6), and the locking member (6) locks and fixes the mating part (72). The positioning element (2) has a limiting hole (22) along its own radial direction. The limiting shaft (3) has a limiting part (31) that is inserted into the limiting hole (22); When the limiting shaft (3) moves synchronously with the valve seat (4), the limiting part (31) can be limited to move in the limiting hole (22) and can be blocked by both ends of the limiting hole (22).

2. The rope core retrieval device according to claim 1, characterized in that, It also includes a reset member (8) sleeved on the periphery of the positioning member (2); The reset member (8) can slide relative to the axial direction of the positioning member (2) and press the limiting part (31) to move in the limiting hole (22) so that the limiting shaft (3) presses the valve seat (4), the movable valve head (5) and the locking member (6) to reset respectively.

3. The rope core retrieval device according to claim 1, characterized in that, The locking element (6) includes a plurality of locking balls spaced around the inner wall of the recovery tube (21); The inner wall of the recovery tube (21) is also provided with a recess (211) for accommodating the locking ball. When the recess (211) slides along the recycling tube (21), it can press the locking member (6) radially along the recycling tube (21) so that the locking member (6) moves toward the axis of the recycling tube (21) and locks the mating part (72).

4. The rope core retrieval device according to claim 1, characterized in that, The positioning element (2) also includes a guide tube (23); The guide tube (23) is fixedly connected to the positioning element (2); The recovery tube (21) is at least partially slidably sleeved on the outer wall of the guide tube (23), and the valve seat (4) and the movable valve head (5) are at least partially slidably plugged into the inner wall of the guide tube (23).

5. The rope core retrieval device according to claim 4, characterized in that, An annular gap is also formed between the guide tube (23) and the recovery tube (21); The first elastic element (41) is a first compression spring disposed in the annular gap, and one end of the first compression spring is connected to the recovery pipe (21), and the other end is connected to the valve seat (4).

6. The rope core retrieval device according to claim 4, characterized in that, The valve seat (4) and the movable valve head (5) are respectively partially plugged into both ends of the guide tube (23), and a accommodating gap is formed between the valve seat (4) and the movable valve head (5); The second elastic element (51) is a second compression spring disposed in the accommodating gap, and one end of the second compression spring is connected to the valve seat (4), and the other end is connected to the movable valve head (5).

7. The rope core retrieval device according to claim 4, characterized in that, The guide tube (23) also has a through-hole (231) in its wall for the locking member (6) to move through. The movable valve head (5) is inserted into the peripheral wall of the guide tube (23) and is also provided with a blocking part (52) for preventing the movement of the locking member (6). When the movable valve head (5) slides back and forth in the guide tube (23), the blocking part (52) can open or close the through port (231) accordingly.

8. The rope core retrieval device according to claim 1, characterized in that, The movable valve head (5) has an insertion portion at one end corresponding to the spearhead (7); One end of the spearhead (7) forms a cone-shaped part (71) that is inserted into the receiving part.

9. The rope core retrieval device according to claim 8, characterized in that, The mating part (72) includes an annular retaining edge located at the end of the conical part (71); The locking element (6) abuts against the annular retaining edge locking element radially along the spearhead (7).

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