A fishing tool introduction structure

Abstract

The application relates to an introduction structure of a fishing tool, belonging to the field of oil and gas field development, comprising an expansion drive, one end of the expansion drive being provided with a base, the other end of the expansion drive being provided with an expansion guide structure, the inner side of the expansion drive being provided with a flow guide structure, the expansion guide structure comprising unfolding link members and a plurality of rigid unfolding petals, one end of the expansion drive, away from the base, being connected with the rigid unfolding petals, and the unfolding link members being connected between adjacent rigid unfolding petals. The expansion drive makes the expansion guide structure complete expansion and folding actions, the expansion guide structure increases the guide area and the projection area through the expansion action, and the expansion guide structure pushes the fish in the guide area through the folding action, so that the fish is correctly guided into the inside of the fishing tool. The application provides a larger effective guide area, enhances the adaptability of the introduction structure to the fish shape, and improves the efficiency and success rate of the fishing operation.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of oil and gas field development, and particularly relates to an introducing structure of a fishing tool. BACKGROUND

[0002] In downhole operations of oil fields, when fish falling phenomenon occurs, i.e. downhole tools or materials sink to the bottom of the well due to failure, a fishing tool needs to be used for fishing. After the fishing tool introduces the fish into the interior of the fishing tool through the introducing mechanism, the fishing tool can match and make a buckle with the downhole fish through the buckle making mechanism, and realize mechanical locking to lift the fish out of the well. A common introducing mechanism is a reverse taper mouth guide shoe, which guides the fish through the natural guiding force generated by the guiding slope of the reverse taper mouth. However, the effective guiding area of the reverse taper mouth guide shoe is limited to the direct projection area of the reverse taper mouth, and only when the fish is just in the projection area of the reverse taper mouth, the fish can be successfully introduced, which leads to the fact that the reverse taper mouth guide shoe is difficult to correctly guide the fish into the interior of the fishing tool when dealing with fish with diversified shapes, sizes and postures, thereby affecting the efficiency and success rate of fishing operations. SUMMARY

[0003] In view of the above problems, the present application provides an introducing structure of a fishing tool, which can correctly guide the fish into the interior of the fishing tool when dealing with fish with diversified shapes, sizes and postures, thereby improving the efficiency and success rate of fishing operations.

[0004] An introducing structure of a fishing tool, comprising an expansion drive, one end of the expansion drive is provided with a base, the other end of the expansion drive is provided with an expansion guide structure, the inner side of the expansion drive is provided with a flow guide structure, the expansion guide structure comprises a spread link and a plurality of rigid spread petals, the end of the expansion drive away from the base is connected with the rigid spread petals, and the adjacent rigid spread petals are connected with the spread link.

[0005] Further, the expansion drive comprises a turbine ring, the outer ring of the turbine ring is provided with a gear ring, the gear ring is engaged with a swing piece, the swing piece is rotationally connected with the base, the end of the swing piece away from the gear ring is connected with the expansion guide structure, the inner ring of the turbine ring is provided with the flow guide structure, and the gear ring is provided with an elastic structure connected with the base.

[0006] Further, the swing piece comprises a swing rod, the end of the swing rod close to the gear ring is provided with an engagement tooth, the engagement tooth is engaged with the gear ring, the part of the swing rod close to the engagement tooth is rotationally connected with the base through a fastener, and the part of the swing rod away from the engagement tooth is hingedly connected with the rigid spread petals through a fastener.

[0007] Furthermore, the elastic structure includes a protrusion and an elastic element. The protrusion is disposed on the toothed ring, and one end of the protrusion facing away from the toothed ring is slidably connected to the base. The elastic element is disposed inside the base, and the protrusion is in contact with the elastic element.

[0008] Furthermore, the base has a guide groove at one end facing the toothed ring, the protrusion is slidably disposed in the guide groove, the elastic element is engaged in the guide groove, and the protrusion contacts the end of the elastic element.

[0009] Furthermore, the flow guiding structure includes flow guiding plates, and a plurality of flow guiding plates are evenly distributed on the inner ring of the turbine ring. The flow guiding plates are hinged to the inner ring of the turbine ring, and adsorption elements are embedded on both sides of the flow guiding plates facing the inner cavity of the base. Adjacent flow guiding plates are connected by adsorption elements.

[0010] Furthermore, the unfolding connecting rod includes a first connecting rod and a second connecting rod, which are cross-hinged. One end of the first connecting rod and the second connecting rod in the same direction is connected to a rigid unfolding petal, and the other end of the first connecting rod and the second connecting rod in the same direction is connected to an adjacent rigid unfolding petal.

[0011] Furthermore, the first connecting rod and the second connecting rod have the same structure. The first connecting rod includes a rod body, a slider, and a positioning element. One end of the rod body is provided with a positioning element, and the other end of the rod body is provided with a slider. The positioning element is connected to the rigid unfolding petal, and the slider is slidably connected to the adjacent rigid unfolding petal.

[0012] Furthermore, both sides of the rigid unfolding petal are provided with receiving grooves, the groove walls of the receiving grooves are provided with sliding grooves, the slider is received in the sliding grooves, and the positioning element is disposed in the receiving grooves.

[0013] Furthermore, the outer wall of the rigid unfolding petal is provided with guide balls.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] This invention utilizes an expansion-driven mechanism to expand and retract the guiding structure. The expansion action increases the guiding area and projected area, while the retraction action pushes the fish within the guiding area, thus guiding it correctly into the retrieval tool. This invention provides a larger effective guiding area and enhances the adaptability of the introduction structure to the shape of the fish, thereby improving the efficiency and success rate of retrieval operations.

[0016] This invention overcomes the technical problem of existing introduction tools being unable to adapt to the diversity of fish falling into the water, making it difficult to correctly guide the fish into the retrieval tool.

[0017] The flow guiding structure in this invention can not only guide the high-pressure working medium through the turbine ring to provide rotational power, but also be used to avoid falling fish and guide them into the interior of the retrieval tool.

[0018] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description and the drawings. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic diagram of the introduction structure of a salvage device is shown;

[0021] Figure 2 A schematic diagram showing the connection between the flow guiding structure, the expansion drive, and the expansion guide structure is provided.

[0022] Figure 3 It shows Figure 2 A magnified view of part A in the image;

[0023] Figure 4 The diagram shows the state of the connecting rods when the expansion guide structure is retracted;

[0024] Figure 5 A schematic diagram of the expansion guide structure during expansion is shown;

[0025] Figure 6 A schematic diagram showing the connection of the protrusion, elastic element, and guide groove is provided.

[0026] Figure 7 It shows Figure 6 A magnified view of part B in the image;

[0027] Figure 8 The diagram shows the state of the connecting rods as the expansion guide structure expands;

[0028] Figure 9 It shows Figure 8 A magnified view of part C;

[0029] Figure 10 The diagram shows the state of the oscillating element and the toothed ring during the expansion of the expansion guide structure;

[0030] Figure 11The diagram shows the state of the flow guiding structure when the expansion guiding structure retracts.

[0031] Reference numerals: 1. Base; 11. Guide groove; 2. Flow guiding structure; 21. Flow guide plate; 211. Magnet; 3. Expansion drive; 31. Turbine ring; 32. Tooth ring; 321. Protrusion; 322. Elastic element; 33. Swinging element; 331. Meshing tooth; 332. Swing rod; 4. Deployment connecting rod; 41. First connecting rod; 411. Positioning element; 412. Rod body; 413. Slider; 42. Second connecting rod; 5. Rigid deployment petal; 51. Receiving groove; 52. Sliding groove; 53. Guide ball; 54. Separating surface. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of 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 embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Example 1

[0034] Figure 1 A schematic diagram of the introduction structure of a salvage device is shown. Figure 1 As shown, an introduction structure for a salvage device includes an expansion drive 3, one end of which is provided with a base 1. Figure 2 A schematic diagram showing the connection between the flow guiding structure 2, the expansion drive 3, and the expansion guide structure is shown, as follows: Figure 2 As shown, the other end of the expansion drive 3 is provided with an expansion guide structure, and the inner side of the expansion drive 3 is provided with a flow guide structure 2. Figure 4 The diagram shows the state of the connecting rod 4 when the expansion guide structure is retracted. (See diagram for example.) Figure 4 As shown, the expansion guide structure includes an expansion link 4 and several rigid expansion petals 5. The end of the expansion drive 3 away from the base 1 is connected to the rigid expansion petals 5, and an expansion link 4 is connected between adjacent rigid expansion petals 5.

[0035] The retrieval device's introduction structure, through the expansion drive 3, enables the expansion guide structure to complete its expansion and retraction actions. The expansion guide structure, through its expansion action, increases the guidance area and projected area. The retraction action then pushes the fallen fish within the guidance area, thus correctly guiding it into the retrieval tool. The retrieval device's introduction structure not only provides a larger effective guidance area but also enhances its adaptability to the shape of the fallen fish, thereby improving the efficiency and success rate of retrieval operations.

[0036] Specifically, the expansion drive 3 is used to displace the rigid unfolding petal 5. Figure 5 A schematic diagram of the expansion guide structure during expansion is shown, such as... Figure 5 As shown, when the rigid unfolding petals 5 unfold outward in the radial direction, the unfolding connecting rods 4 are driven to extend in the vertical direction of the separating surfaces 54 of the adjacent rigid unfolding petals 5, so that the expansion guide structure as a whole forms a fan-shaped ring with interval distribution, which increases the guide area and the projected area also increases.

[0037] Specifically, the base 1 is ring-shaped.

[0038] Specifically, the expansion guide structure is centered on the axis of base 1 to ensure the balance of the projected area.

[0039] In some embodiments, the expansion drive 3 includes a turbine ring 31, with a toothed ring 32 on the outer ring of the turbine ring 31. A swing member 33 is engaged on the toothed ring 32, and the swing member 33 is rotatably connected to the base 1. One end of the swing member 33 facing away from the toothed ring 32 is connected to the expansion guide structure. A flow guide structure 2 is provided on the inner ring of the turbine ring 31, and an elastic structure connected to the base 1 is provided on the toothed ring 32. The turbine ring 31 is used to drive the toothed ring 32 to rotate, thereby driving the expansion guide structure to complete the expansion and contraction actions. Figure 10 The diagram shows the state of the oscillating member 33 and the toothed ring 32 during the expansion of the expansion guide structure, as follows: Figure 10 As shown, the toothed ring 32 is used to drive the swinging member 33 to expand and retract, thereby driving the expansion guide structure to complete the expansion and retraction actions; the swinging member 33 is rotatably connected to the base 1, which facilitates the toothed ring 32 to drive the swinging member 33 to expand and retract; the swinging member 33 is connected to the expansion guide structure, which facilitates the expansion guide structure to complete the expansion and retraction actions; the flow guide structure 2 is used to guide the fallen fish into the interior of the retrieval tool, and also to guide the high-pressure working medium to flow through the turbine ring 31 to provide rotational power; the elastic reset of the elastic structure drives the toothed ring 32 to rotate in the opposite direction, thereby causing the swinging member 33 to swing and thus driving the expansion guide structure to complete the retraction action.

[0040] Specifically, the turbine blades of the turbine ring 31 are used to generate a force that drives the turbine ring 31 to rotate clockwise when pressurizing from the surface end into the well through the flow of the working medium.

[0041] Figure 3 It shows Figure 2 A magnified view of part A in the image. Figure 3As shown, in some embodiments, the swing member 33 includes a swing rod 332. The end of the swing rod 332 near the toothed ring 32 is provided with a meshing tooth 331. The meshing tooth 331 meshes with the toothed ring 32. The part of the swing rod 332 near the meshing tooth 331 is rotatably connected to the base 1 by a fastener. The part of the swing rod 332 away from the meshing tooth 331 is hinged to the rigid unfolding petal 5 by a fastener. The meshing tooth 331 is used to mesh with the toothed ring 32, so that the toothed ring 32 can drive the swing rod 332 to unfold and retract. The part of the swing rod 332 away from the meshing tooth 331 is connected to the expansion guide structure, so as to drive the expansion guide structure to perform expansion and retraction actions.

[0042] Specifically, fasteners can be selected, but are not limited to, pins. Pins are existing technology and will not be described further here.

[0043] In some embodiments, the elastic structure includes a protrusion 321 and an elastic element 322. The protrusion 321 is disposed on the toothed ring 32, and one end of the protrusion 321 facing away from the toothed ring 32 is slidably connected to the base 1. The elastic element 322 is disposed inside the base 1, and the protrusion 321 contacts the elastic element 322. The contact between the protrusion 321 and the elastic element 322 allows the protrusion 321 to squeeze the elastic element 322 when the toothed ring 32 rotates clockwise, and the elastic reset of the elastic element 322 causes the toothed ring 32 to rotate, thereby causing the swing rod 332 to swing and drive the expansion guide structure to complete the closing action.

[0044] Figure 6 A schematic diagram showing the connection between the protrusion 321, the elastic element 322, and the guide groove 11 is provided. Figure 6 As shown, in some embodiments, the base 1 is provided with a guide groove 11 at one end facing the toothed ring 32, the protrusion 321 is slidably disposed in the guide groove 11, the elastic element 322 is engaged in the guide groove 11, and the protrusion 321 is in contact with the end of the elastic element 322. Figure 7 It shows Figure 6 A magnified view of part B, such as Figure 7 As shown, the guide groove 11 provides a sliding path for the protrusion 321 and a pressing path for the protrusion 321 to press against the elastic element 322; the guide groove 11 provides installation space for the elastic element 322 and restricts the position of the elastic element 322; the protrusion 321 contacts the end of the elastic element 322 so that when the toothed ring 32 rotates clockwise, the protrusion 321 presses against the elastic element 322, and the elastic reset of the elastic element 322 causes the toothed ring 32 to rotate so that the rocker arm 332 swings, thereby driving the expansion guide structure to complete the closing action.

[0045] Specifically, the shape of the sliding groove 52 can be selected, but is not limited to, an arc shape.

[0046] Specifically, the shape of the elastic element 322 can be selected, but is not limited to, an arc shape.

[0047] In some embodiments, the flow guiding structure 2 includes flow guiding plates 21. A plurality of flow guiding plates 21 are evenly distributed on the inner ring of the turbine ring 31. The flow guiding plates 21 are hinged to the inner ring of the turbine ring 31. Adsorption elements are embedded on both sides of the flow guiding plates 21 facing the inner cavity of the base 1. Adjacent flow guiding plates 21 are connected by adsorption elements. The flow guiding plates 21 are used to guide fallen fish into the interior of the retrieval tool. The adsorption elements are used to connect adjacent flow guiding plates 21, so that the plurality of flow guiding plates 21 play a guiding role. When the plurality of flow guiding plates 21 are adsorbed and connected, the central through hole of the turbine ring 31 is in a closed state, which can guide the high-pressure working medium to flow through the turbine ring 31 to provide rotational power. Figure 11 The diagram shows the state of the flow guide structure 2 when the expansion guide structure retracts, as shown below. Figure 11 As shown, when several guide plates 21 are pushed open by the falling fish, the central through hole of the turbine ring 31 is opened, and the falling fish enters the interior of the retrieval tool through the central through hole, thereby achieving a guiding effect.

[0048] In some embodiments, the adsorption element includes a magnet 211, and magnets 211 are embedded in the portions of both sides of the guide plate 21 facing the inner cavity of the base 1. Adjacent guide plates 21 are connected by magnets 211. The magnets 211 are used to apply a mutual magnetic force to each guide plate 21, so that the guide structure 2 is kept in a conical shape, which facilitates the guidance of the high-pressure working medium through the turbine ring 31 to provide rotational power.

[0049] In some embodiments, the guide plate 21 is triangular in shape, and magnets 211 are embedded on both sides of the guide plate 21 facing the inner cavity of the base 1. Adjacent guide plates 21 are connected by magnets 211. After adjacent guide plates 21 are connected by magnets, a conical guide structure 2 is formed. At this time, the central through hole of the turbine ring 31 is closed. Once the conical guide structure 2 is opened by a fish, the central through hole of the turbine ring 31 is opened, and the fish enters the inside of the retrieval tool through the central through hole, thereby achieving the guiding effect. The conical guide structure 2 facilitates the flow of high-pressure working medium through the turbine ring 31 to provide rotational power.

[0050] In some embodiments, the end of the swing member 33 facing away from the toothed ring 32 is connected to the rigid unfolding petal 5, which facilitates the closing and unfolding of the rigid unfolding petal 5.

[0051] In some embodiments, the unfolding connecting rod 4 includes a first connecting rod 41 and a second connecting rod 42, the first connecting rod 41 and the second connecting rod 42 are cross-hinged, one end of the first connecting rod 41 and the second connecting rod 42 in the same direction is connected to the rigid unfolding petal 5, and the other end of the first connecting rod 41 and the second connecting rod 42 in the same direction is connected to the adjacent rigid unfolding petal 5. Figure 8 The diagram shows the state of the extended connecting rod 4 during the expansion of the expansion guide structure, as follows:Figure 8 As shown, when the rigid unfolding petal 5 unfolds radially outward, the first connecting rod 41 and the second connecting rod 42 are driven to extend in the vertical direction of the separating surface 54 of the adjacent rigid unfolding petals 5, so that the expansion guide structure as a whole forms a fan-shaped ring with interval distribution, which increases the guide area and the projected area also increases accordingly.

[0052] Figure 9 It shows Figure 8 A magnified view of a portion of C. (e.g.) Figure 9 As shown, in some embodiments, the first connecting rod 41 and the second connecting rod 42 have the same structure. The first connecting rod 41 includes a rod body 412, a slider 413, and a positioning member 411. One end of the rod body 412 is provided with the positioning member 411, and the other end of the rod body 412 is provided with the slider 413. The positioning member 411 is connected to the rigid unfolding petal 5, and the slider 413 is slidably connected to the adjacent rigid unfolding petal 5. The positioning member 411 is used to connect the rod body 412 and the rigid unfolding petal 5, and to limit the rotation of the end of the rod body 412. The slider 413 is slidably connected to the adjacent rigid unfolding petal 5, which allows the first connecting rod 41 to be driven to extend in the vertical direction of the separating surface 54 of the adjacent rigid unfolding petal 5, thereby making the expansion guide structure as a whole form a fan-shaped ring with interval distribution, increasing the guide area and the projected area.

[0053] Specifically, the positioning element 411 is optional but not limited to a pin.

[0054] In some embodiments, the rigid unfolding petals 5 are provided with receiving grooves 51 on both sides, and the groove walls of the receiving grooves 51 are provided with sliding grooves 52. The slider 413 is accommodated in the sliding grooves 52, and the positioning member 411 is disposed in the receiving grooves 51. The receiving grooves 51 provide installation space for the first connecting rod 41 and the second connecting rod 42, and also provide accommodating space for the first connecting rod 41 and the second connecting rod 42, so that when the expansion guide structure is closed, there is no gap between adjacent rigid unfolding petals 5, and they can be completely closed, thereby completing the retraction action.

[0055] In some embodiments, the outer wall of the rigid expansion petal 5 is provided with guide balls 53; when the guide balls 53 abut against the inner wall of the well casing, the volume of the guide area of ​​the expansion guide structure reaches the upper limit, and the effective guide area at this time basically covers the inner diameter of the casing.

[0056] Specifically, the dividing surface 54 of the rigid unfolding petal 5 is conical, which facilitates pushing and guiding the fish into the expansion guide structure.

[0057] The working principle of the retrieval device's introduction structure is as follows:

[0058] The expansion drive 3 enables the expansion guide structure to complete the expansion and retraction actions. The expansion guide structure increases the guide area and the projected area through the expansion action. The expansion guide structure pushes the fallen fish in the guide area through the retraction action, thereby correctly guiding the fallen fish into the inside of the salvage tool, thus improving the efficiency and success rate of the salvage operation.

[0059] In this process, the base 1 is threaded to the lower section of the retrieval tube of the retrieval device, and then the retrieval device is moved into the well. High-pressure working medium is pumped into the well from the surface end. The high-pressure working medium drives the gear to rotate clockwise relative to the base 1 through the turbine ring 31. At the same time, the protrusion 321 squeezes the elastic element 322. During the rotation, the swing rod 332 swings and drives the rigid unfolding petals 5 to unfold. At the same time, the first connecting rod 41 and the second connecting rod 42 are driven to extend in the vertical direction of the separation surface 54 of the adjacent rigid unfolding petals 5, so that several rigid unfolding petals 5 form a fan-shaped ring with interval distribution. At this time, the guiding area increases and the projected area also increases. When the guiding ball 53 abuts against the inner wall of the well casing, the volume of the guiding area of ​​the expansion guiding structure reaches the upper limit, covering the inner diameter of the well casing and completing the expansion action.

[0060] At this time, the elastic element 322 is squeezed by the protrusion 321, and the pumping of high-pressure working medium into the well stops at the surface end, and the driving force of the turbine ring 31 disappears. The elastic reset of the elastic element 322 causes the toothed ring 32 to rotate counterclockwise relative to the base 1, causing the swing rod 332 to swing and thus drive the rigid expansion petals 5 to move radially inward along the base 1. At the same time, the first connecting rod 41 and the second connecting rod 42 are driven to retract and be accommodated in the accommodating groove 51. After the separating surfaces 54 of adjacent rigid expansion petals 5 come into contact, the expansion guide structure completes the retraction action. During the retraction process, the rigid expansion petals 5 push and guide the fish into the expansion guide structure and continuously push it towards the center of the expansion guide structure, thereby guiding the fish into the ring formed by each rigid expansion petal 5 in the retracted state. As the retrieval tube is lowered again, the expansion guide structure will introduce new fish. The fish that were originally introduced into the expansion guide structure will be squeezed and come into contact with several guide plates 21, causing the guide plates 21 to deflect outward and separate, opening the central through hole of the turbine ring 31. This avoids the fish and guides the fish through the central through hole into the retrieval device.

[0061] Specifically, when the expansion guide structure is in a contracted state and there are no fish falling into the inner cavity, several guide plates 21 will form a conical guide structure 2 after being connected by adsorption.

[0062] Specifically, after the structure is lowered to a distance of 3-5 meters from the top of the fish that fell into the well, the pump is turned on to pump high-pressure working medium into the well.

[0063] Example 2

[0064] Based on Example 1, the outer diameter of the casing inside the well is 139.7 mm and the inner diameter is 115.52 mm. After use, the casing deforms and shrinks to 92 mm. The fish falls below the casing deformation point and is attached to the wall. The size of the fish is 73 mm. The outer diameter of the expansion guide structure is 90 mm. The expansion guide structure can expand to 115 mm, thus pushing the fish in the guide area and correctly guiding the fish into the inside of the retrieval tool, thereby improving the efficiency and success rate of the retrieval operation.

[0065] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An introduction structure for a salvage device, characterized in that, The device includes an expansion drive (3), one end of which is provided with a base (1), and the other end of which is provided with an expansion guide structure. A flow guide structure (2) is provided on the inner side of the expansion drive (3). The expansion guide structure includes a deployment connecting rod (4) and several rigid deployment petals (5). The end of the expansion drive (3) away from the base (1) is connected to the rigid deployment petals (5), and deployment connecting rods (4) connect adjacent rigid deployment petals (5). The expansion drive (3) includes a turbine ring (31), the outer ring of which is provided with a toothed ring (32). A swinging member (33) meshes with the toothed ring (32), and the swinging member (33) is rotatably connected to the base (1). The end of the swinging member (33) away from the toothed ring (32) is connected to the expansion guide structure. A flow guide structure (2) is provided on the inner ring of the turbine ring (31). The toothed ring (32) is provided with an elastic structure connected to the base (1). The swing member (33) includes a swing rod (332). The end of the swing rod (332) near the toothed ring (32) is provided with a meshing tooth (331). The meshing tooth (331) meshes with the toothed ring (32). The part of the swing rod (332) near the meshing tooth (331) is rotatably connected to the base (1) by a fastener. The part of the swing rod (332) away from the meshing tooth (331) is hinged to the rigid unfolding petal (5) by a fastener. The flow guiding structure (2) includes a flow guiding plate (21). Several flow guiding plates (21) are evenly distributed on the inner ring of the turbine ring (31). The flow guiding plate (21) is hinged to the inner ring of the turbine ring (31). Adsorption elements are embedded on both sides of the flow guiding plate (21) facing the inner cavity of the base (1). Adjacent flow guiding plates (21) are adsorbed and connected by adsorption elements.

2. The introduction structure of the retrieval device according to claim 1, characterized in that, The elastic structure includes a protrusion (321) and an elastic element (322). The protrusion (321) is provided on the toothed ring (32). One end of the protrusion (321) away from the toothed ring (32) is slidably connected to the base (1). The elastic element (322) is provided inside the base (1). The protrusion (321) is in contact with the elastic element (322).

3. The introduction structure of the retrieval device according to claim 2, characterized in that, The base (1) has a guide groove (11) at one end facing the toothed ring (32), the protrusion (321) is slidably disposed in the guide groove (11), the elastic element (322) is engaged in the guide groove (11), and the protrusion (321) is in contact with the end of the elastic element (322).

4. The introduction structure of the retrieval device according to claim 1, characterized in that, The unfolding connecting rod (4) includes a first connecting rod (41) and a second connecting rod (42). The first connecting rod (41) and the second connecting rod (42) are hinged together. One end of the first connecting rod (41) and the second connecting rod (42) in the same direction is connected to the rigid unfolding petal (5). The other end of the first connecting rod (41) and the second connecting rod (42) in the same direction is connected to the adjacent rigid unfolding petal (5).

5. The introduction structure of the retrieval device according to claim 4, characterized in that, The first connecting rod (41) and the second connecting rod (42) have the same structure. The first connecting rod (41) includes a rod body (412), a slider (413) and a positioning member (411). One end of the rod body (412) is provided with a positioning member (411), and the other end of the rod body (412) is provided with a slider (413). The positioning member (411) is connected to the rigid unfolding petal (5), and the slider (413) is slidably connected to the adjacent rigid unfolding petal (5).

6. The introduction structure of the retrieval device according to claim 5, characterized in that, The rigid unfolding petal (5) has a receiving groove (51) on both sides. The receiving groove (51) has a sliding groove (52) on its wall. The slider (413) is housed in the sliding groove (52). The positioning member (411) is set in the receiving groove (51).

7. The introduction structure of the retrieval device according to any one of claims 4 to 6, characterized in that, The outer wall of the rigid unfolding petal (5) is provided with guide balls (53).

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