Leading-in structure of fisher

Abstract

The invention relates to an introduction structure of a fisher, which belongs to the field of oil-gas field development and comprises an expansion drive, a base is arranged at one end of the expansion drive, an expansion guide structure is arranged at the other end of the expansion drive, and a flow guide structure is arranged on the inner side of the expansion drive. The expansion guide structure comprises expansion connecting rods and a plurality of rigid expansion flaps, the end, away from the base, of the expansion drive is connected with the rigid expansion flaps, and the expansion connecting rods are connected between the adjacent rigid expansion flaps. The expansion guiding structure completes expansion and folding actions through expansion driving, the expansion guiding structure enlarges the guiding area through the expansion action and also enlarges the projection area, and the expansion guiding structure pushes a fish in the guiding area through the folding action, so that the fish is correctly guided into the fishing tool. The invention provides an effective guide area in a larger range, and enhances the adaptability of the introduction structure to the fish form, thereby improving 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] Further, the elastic structure comprises a protrusion and an elastic piece, the protrusion is arranged on the gear ring, one end of the protrusion away from the gear ring is in sliding connection with the base, and the elastic piece is arranged in the base and in contact with the protrusion.

[0008] Further, one end of the base towards the gear ring is provided with a guide groove, the protrusion is arranged in the guide groove in sliding mode, the elastic piece is arranged in the guide groove in clamping mode, and the end of the protrusion is in contact with the elastic piece.

[0009] Further, the flow guide structure comprises a flow guide plate, a plurality of flow guide plates are uniformly arranged on the inner ring of the turbine ring, the flow guide plates are hinged to the inner ring of the turbine ring, the parts of the two sides of the flow guide plates towards the inner cavity of the base are embedded with suction accessories, and the adjacent flow guide plates are connected through the suction accessories in adsorption mode.

[0010] Further, the unfolding connecting rod comprises a first connecting rod and a second connecting rod, the first connecting rod and the second connecting rod are cross-hinged, one end of the first connecting rod and the second connecting rod in the same direction is connected with the rigid unfolding petal, and the other end of the first connecting rod and the second connecting rod in the same direction is connected with the adjacent rigid unfolding petal.

[0011] Further, the first connecting rod and the second connecting rod are of the same structure, the first connecting rod comprises a rod body, a sliding block and a positioning piece, one end of the rod body is provided with the positioning piece, the other end of the rod body is provided with the sliding block, the positioning piece is connected with the rigid unfolding petal, and the sliding block is in sliding connection with the adjacent rigid unfolding petal.

[0012] Further, both sides of the rigid unfolding petal are provided with accommodating grooves, the accommodating grooves are provided with sliding grooves on the groove walls, the sliding block is accommodated in the sliding groove, and the positioning piece is arranged in the accommodating groove.

[0013] Further, the outer wall of the rigid unfolding petal is provided with a guide ball.

[0014] Compared with the prior art, the present application has the following beneficial effects: The present application expands the guiding structure to complete the expansion and folding actions, the expansion guiding structure increases the guiding area and the projection area through the expansion action, and the expansion guiding structure moves the fish in the guiding area through the folding action, so as to correctly guide the fish into the inside of the fishing tool. The present application provides a larger effective guiding area, enhances the adaptability of the introduction structure to the fish shape, and thus improves the efficiency and success rate of the fishing operation.

[0015] The present application overcomes the technical problems of the prior art that the introduction tool cannot correctly guide the fish into the inside of the fishing tool due to insufficient adaptability and cannot cope with the diversity of the fish state.

[0016] The flow guide structure in the application can not only guide the high-pressure working medium to flow through the turbine ring to provide rotary power, but also can be used for avoiding falling fish and guiding the falling fish into the fishing tool.

[0017] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art upon examination of the following or can be learned by practice of the application. The objects and other advantages of the application can be realized and attained by the structure particularly pointed out in the written description and claims hereof. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0019] Figure 1 A schematic diagram of the introduction structure of the fisher is shown; Figure 2 A connection schematic diagram of the flow guide structure, the expansion drive and the expansion guide structure is shown; Figure 3 A connection schematic diagram of the Figure 2 A partial enlarged view of A in the figure is shown; Figure 4 A state diagram of the expansion guide structure when the expansion guide structure is folded is shown; Figure 5 A schematic diagram of the expansion guide structure when the expansion guide structure is expanded is shown; Figure 6 A connection schematic diagram of the protrusion, the elastic member and the guide slot is shown; Figure 7 A connection schematic diagram of the Figure 6 A partial enlarged view of B in the figure is shown; Figure 8 A state diagram of the expansion guide structure when the expansion guide structure is expanded is shown; Figure 9 A connection schematic diagram of the Figure 8 A partial enlarged view of C in the figure is shown; Figure 10 A state diagram of the expansion guide structure when the expansion guide structure is expanded is shown; Figure 11 A state diagram of the flow guide structure when the expansion guide structure is folded is shown.

[0020] Reference signs: 1, base; 11, guide groove; 2, flow guide structure; 21, flow guide plate; 211, magnet; 3, expansion drive; 31, turbine ring; 32, gear ring; 321, protrusion; 322, elastic piece; 33, swing piece; 331, meshing tooth; 332, swing rod; 4, unfolding link; 41, first connecting rod; 411, positioning piece; 412, rod body; 413, sliding block; 42, second connecting rod; 5, rigid unfolding petal; 51, accommodating groove; 52, sliding groove; 53, guide ball; 54, separation surface. DETAILED DESCRIPTION

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0022] Embodiment one Figure 1 A schematic diagram of the introduction structure of the fishing tool is shown. As shown in Figure 1 The introduction structure of the fishing tool includes an expansion drive 3, one end of the expansion drive 3 is provided with a base 1, Figure 2 A connection schematic diagram of the flow guide structure 2, the expansion drive 3, and the expansion guide structure is shown. As shown in Figure 2 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 A state diagram of the unfolding link 4 when the expansion guide structure is folded is shown. As shown in Figure 4 The expansion guide structure includes the unfolding link 4 and a plurality of rigid unfolding petals 5, the end of the expansion drive 3 away from the base 1 is connected with the rigid unfolding petals 5, and the unfolding link 4 is connected between adjacent rigid unfolding petals 5.

[0023] The introduction structure of the fishing tool makes the expansion guide structure complete expansion and folding actions through the expansion drive 3. The expansion guide structure increases the guide area and the projection area through the expansion action. The expansion guide structure pushes the fish in the guide area through the folding action, so as to correctly guide the fish into the inside of the fishing tool. The introduction structure of the fishing tool not only provides a larger range of effective guide area, but also enhances the adaptability of the introduction structure to the fish shape, thereby improving the efficiency and success rate of the fishing operation.

[0024] Specifically, the expansion drive 3 is used to displace the rigid unfolding petals 5, Figure 5 A schematic diagram when the expansion guide structure is expanded is shown, asFigure 5 As shown, when the rigid expansion petals 5 expand radially outward, the expansion linkers 4 are driven to extend in the vertical direction of the partition surface 54 of the adjacent rigid expansion petals 5, so that the whole expansion guide structure forms a ring surrounded by the spaced fan-shaped structures, increases the guide area, and increases the projection area.

[0025] Specifically, the base 1 is annular in shape.

[0026] Specifically, the expansion guide structure is centered on the axis of the base 1, so as to ensure the balance of the projection area.

[0027] In some embodiments, the expansion drive 3 includes a turbine ring 31, a gear ring 32 provided on the outer ring of the turbine ring 31, an oscillating member 33 engaged with the gear ring 32, the oscillating member 33 being rotationally connected with the base 1, one end of the oscillating member 33 away from the gear ring 32 being connected with the expansion guide structure, a flow guide structure 2 provided on the inner ring of the turbine ring 31, and an elastic structure provided on the gear ring 32 and connected with the base 1; the turbine ring 31 is used to drive the gear ring 32 to rotate, so as to drive the expansion guide structure to complete the expansion and folding actions; Figure 10 The state diagram of the oscillating member 33 and the gear ring 32 when the expansion guide structure expands is shown in FIG. 4. Figure 10 As shown, the gear ring 32 is used to drive the oscillating member 33 to expand and fold, so as to drive the expansion guide structure to complete the expansion and folding actions; the oscillating member 33 is rotationally connected with the base 1, so as to facilitate the gear ring 32 to drive the oscillating member 33 to expand and fold; the oscillating member 33 is connected with the expansion guide structure, so as to facilitate the expansion guide structure to complete the expansion and folding actions; the flow guide structure 2 is used to guide the fish into the interior of the fishing tool, and is also used to guide the high-pressure working medium to flow through the turbine ring 31 to provide rotary power; the elastic reset of the elastic structure drives the gear ring 32 to rotate in the opposite direction, so as to make the oscillating member 33 oscillate and in turn drive the expansion guide structure to complete the folding action.

[0028] Specifically, the turbine blades of the turbine ring 31 are used to pressurize into the well at the ground end, and through the flow of the working medium, a force driving the turbine ring 31 to rotate clockwise is generated.

[0029] Figure 3 The state diagram of the oscillating member 33 and the gear ring 32 when the expansion guide structure folds is shown in FIG. 5. Figure 2 The local enlarged view of A in FIG. 5. Figure 3As shown, in some embodiments, the swing member 33 comprises a swing rod 332, the swing rod 332 is provided with engagement teeth 331 at one end close to the tooth ring 32, the engagement teeth 331 are engaged with the tooth ring 32, the part of the swing rod 332 close to the engagement teeth 331 is rotationally connected with the base 1 through a fastener, and the part of the swing rod 332 away from the engagement teeth 331 is hingedly connected with the rigid unfolding petal 5 through a fastener; the engagement teeth 331 are used to engage with the tooth ring 32, facilitating the tooth ring 32 to drive the swing rod 332 to unfold and fold; the part of the swing rod 332 away from the engagement teeth 331 is connected with the expansion guide structure, facilitating the expansion guide structure to perform expansion and folding actions.

[0030] Specifically, the fastener can be but is not limited to a pin shaft. The pin shaft is a prior art, and thus will not be described here.

[0031] In some embodiments, the elastic structure comprises a protrusion 321 and an elastic member 322, the protrusion 321 is provided on the tooth ring 32, one end of the protrusion 321 away from the tooth ring 32 is slidingly connected with the base 1, and the elastic member 322 is provided in the base 1, the protrusion 321 is in contact with the elastic member 322; the protrusion 321 is in contact with the elastic member 322, so that when the tooth ring 32 rotates clockwise, the protrusion 321 extrudes the elastic member 322, and the elastic reset of the elastic member 322 makes the tooth ring 32 rotate to make the swing rod 332 swing and in turn drive the expansion guide structure to complete the folding action.

[0032] Figure 6 A connection diagram of the protrusion 321, the elastic member 322 and the guide groove 11 is shown. As Figure 6 As shown, in some embodiments, one end of the base 1 towards the tooth ring 32 is provided with a guide groove 11, the protrusion 321 is slidingly arranged in the guide groove 11, the elastic member 322 is clamped in the guide groove 11, and the end of the protrusion 321 is in contact with the elastic member 322; Figure 7 A connection diagram of the protrusion 321, the elastic member 322 and the guide groove 11 is shown. As Figure 6 A partial enlarged view of B in FIG. 11 is shown. As Figure 7 As shown, the guide groove 11 provides a sliding path for the protrusion 321 and an extrusion path for the protrusion 321 to extrude the elastic member 322; the guide groove 11 provides an installation space for the elastic member 322 and limits the position of the elastic member 322; the end of the protrusion 321 is in contact with the elastic member 322, so that when the tooth ring 32 rotates clockwise, the protrusion 321 extrudes the elastic member 322, and the elastic reset of the elastic member 322 makes the tooth ring 32 rotate to make the swing rod 332 swing and in turn drive the expansion guide structure to complete the folding action.

[0033] Specifically, the shape of the sliding groove 52 can be but is not limited to an arc shape.

[0034] Specifically, the shape of the elastic member 322 can be but is not limited to an arc shape.

[0035] In some embodiments, the flow guide structure 2 comprises flow guide plates 21, and a plurality of flow guide plates 21 are evenly distributed on the inner ring of the turbine ring 31, the flow guide plates 21 are hinged to the inner ring of the turbine ring 31, and the flow guide plates 21 are embedded with suction accessories on both sides of the flow guide plates 21 towards the inner cavity of the base 1, and the adjacent flow guide plates 21 are connected by the suction accessories; the flow guide plates 21 are used to guide the fish into the inside of the fishing tool; the suction accessories are used to connect the adjacent flow guide plates 21, so that the plurality of flow guide plates 21 play a guiding role, and when the plurality of flow guide plates 21 are connected by suction, the central through hole of the turbine ring 31 is in a closed state, and the high-pressure working medium can flow through the turbine ring 31 to provide rotary power, Figure 11 The state diagram of the flow guide structure 2 when the expansion guide structure is folded is shown in FIG. 4. Figure 11 As shown in FIG. 5, when the plurality of flow guide plates 21 are pushed open by the fish, the central through hole of the turbine ring 31 is opened, and the fish enters the inside of the fishing tool through the central through hole, so as to achieve the guiding effect.

[0036] In some embodiments, the suction accessories comprise magnets 211, and the flow guide plates 21 are embedded with the magnets 211 on both sides of the flow guide plates 21 towards the inner cavity of the base 1, and the adjacent flow guide plates 21 are connected by the magnets 211; the magnets 211 are used to apply mutual attractive magnetic force to the flow guide plates 21, so that the flow guide structure 2 remains conical, and the high-pressure working medium can flow through the turbine ring 31 to provide rotary power.

[0037] In some embodiments, the flow guide plates 21 are triangular, the flow guide plates 21 are embedded with the magnets 211 on both sides of the flow guide plates 21 towards the inner cavity of the base 1, and the adjacent flow guide plates 21 are connected by the magnets 211; after the adjacent flow guide plates 21 are connected by suction, a conical flow guide structure 2 is formed, at this time, the central through hole of the turbine ring 31 is in a closed state, once the conical flow guide structure 2 is pushed open by the fish, the central through hole of the turbine ring 31 is opened, and the fish enters the inside of the fishing tool through the central through hole, so as to achieve the guiding effect; the conical flow guide structure 2 facilitates the high-pressure working medium to flow through the turbine ring 31 to provide rotary power.

[0038] In some embodiments, one end of the swing member 33 away from the tooth ring 32 is connected with the rigid unfolding petals 5, so as to facilitate the closing and unfolding of the rigid unfolding petals 5.

[0039] In some embodiments, the unfolding link member 4 comprises 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 with the rigid unfolding petals 5, and the other end of the first connecting rod 41 and the second connecting rod 42 in the same direction is connected with the adjacent rigid unfolding petals 5; Figure 8 The state diagram of the unfolding link member 4 when the expansion guide structure is expanded is shown in FIG. 6.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.

[0040] 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.

[0041] Specifically, the positioning element 411 is optional but not limited to a pin.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] The working principle of the retrieval device's introduction structure is as follows: The expansion guide structure is expanded and contracted by the expansion drive 3. The expansion guide structure expands to increase the guide area and the projection area. The expansion guide structure contracts to push the fish in the guide area into the fishing tool, thereby improving the efficiency and success rate of fishing operations.

[0046] The base 1 is screwed to the lower section of the fishing barrel of the fishing tool, and the fishing tool is moved into the well. The high-pressure working medium is pumped into the well from the ground 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 extrudes the elastic member 322. In the process of rotation, the swing rod 332 swings and drives the rigid expansion petals 5 to expand. 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 expansion petals 5, so that the plurality of rigid expansion petals 5 form a ring surrounded by the fan-shaped spaces. At this time, the guide area of the expansion guide structure is increased, and the projection area is also increased. When the guide ball 53 abuts against the inner wall of the wellbore casing, the volume of the guide area of the expansion guide structure reaches the upper limit, covering the inner diameter of the wellbore casing, and the expansion action is completed.

[0047] At this time, the elastic member 322 is extruded by the protrusion 321, and the high-pressure working medium is stopped from being pumped into the well from the ground end. The driving force of the turbine ring 31 disappears. The elastic reset of the elastic member 322 drives the gear ring 32 to rotate counterclockwise relative to the base 1, so that the swing rod 332 swings and drives the rigid expansion petals 5 to move inward along the radial direction of the base 1. At the same time, the first connecting rod 41 and the second connecting rod 42 are driven to contract and be accommodated in the accommodating groove 51. After the separation surface 54 of the adjacent rigid expansion petals 5 contacts, the expansion guide structure completes the contraction action. In the process of contraction, the fish is pushed and guided into the expansion guide structure, and continuously pushed to the center of the expansion guide structure, so as to guide the fish into the ring formed by the rigid expansion petals 5 in the contracted state. With the further lowering of the fishing barrel, the expansion guide structure will introduce new fish, and the originally introduced fish in the expansion guide structure will be extruded and abut against the plurality of guide plates 21, so that the plurality of guide plates 21 are deflected and separated outward, opening the central through hole of the turbine ring 31, thereby avoiding the fish and guiding the fish to enter the inside of the fishing tool through the central through hole.

[0048] Specifically, when the expansion guide structure is in the contracted state and the inner cavity is free of fish, the plurality of guide plates 21 form a conical guide structure 2 after being connected by adsorption.

[0049] Specifically, the introduction structure is lowered to a distance of 3-5 meters from the fish top 3, and then the high-pressure working medium is pumped into the well.

[0050] Example Two On the basis of the first embodiment, the outer diameter of the casing in the well is 139.7 mm, the inner diameter is 115.52 mm, the casing is deformed and shrunk to 92 mm after use, the fish is located below the casing deformation point and adheres 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 be expanded to 115 mm, so that the fish in the guide area can be pushed and guided, thereby correctly guiding the fish into the inside of the fishing tool, so as to improve the efficiency and success rate of the fishing operation.

[0051] Although the present application is described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An introduction structure for a salvage device, characterized in that, It includes an expansion drive (3), one end of which is provided with a base (1), the other end of which is provided with an expansion guide structure, and the inner side of the expansion drive (3) is provided with a flow guide structure (2). The expansion guide structure includes a deployment link (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 a deployment link (4) is connected between adjacent rigid deployment petals (5).

2. The introduction structure of the retrieval device according to claim 1, characterized in that, The expansion drive (3) includes a turbine ring (31), the outer ring of the turbine ring (31) is provided with a toothed ring (32), the toothed ring (32) is engaged with a swing member (33), the swing member (33) is rotatably connected to the base (1), the end of the swing member (33) away from the toothed ring (32) is connected to the expansion guide structure, the inner ring of the turbine ring (31) is provided with a flow guide structure (2), and the toothed ring (32) is provided with an elastic structure connected to the base (1).

3. The introduction structure of the retrieval device according to claim 2, characterized in that, 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.

4. The introduction structure of the retrieval device according to claim 2, 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).

5. The introduction structure of the retrieval device according to claim 4, 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).

6. The introduction structure of the retrieval device according to claim 2, characterized in that, 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 connected by adsorption elements.

7. 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).

8. The introduction structure of the retrieval device according to claim 7, 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).

9. The introduction structure of the retrieval device according to claim 8, 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).

10. The introduction structure of the retrieval device according to any one of claims 7 to 9, characterized in that, The outer wall of the rigid unfolding petal (5) is provided with guide balls (53).

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