CN114151036A - Fishing tool capable of radially tightening up in multiple sizes - Google Patents
Fishing tool capable of radially tightening up in multiple sizes Download PDFInfo
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- CN114151036A CN114151036A CN202010932729.8A CN202010932729A CN114151036A CN 114151036 A CN114151036 A CN 114151036A CN 202010932729 A CN202010932729 A CN 202010932729A CN 114151036 A CN114151036 A CN 114151036A
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- 239000007787 solid Substances 0.000 claims description 13
- 238000007789 sealing Methods 0.000 claims description 11
- 241000251468 Actinopterygii Species 0.000 abstract description 59
- 238000000034 method Methods 0.000 abstract description 22
- 238000005553 drilling Methods 0.000 description 16
- 239000012530 fluid Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 208000010392 Bone Fractures Diseases 0.000 description 1
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- 230000004323 axial length Effects 0.000 description 1
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- 229910052602 gypsum Inorganic materials 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B31/00—Fishing for or freeing objects in boreholes or wells
- E21B31/12—Grappling tools, e.g. tongs or grabs
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Abstract
The invention relates to a multi-size fishing tool capable of being radially tightened, which comprises an outer pipe and an inner pipe, wherein an outer fishing hook is fixed at the bottom end of the outer pipe, a through groove is formed in the pipe wall of the lower part of the inner pipe, and an inner fishing hook capable of swinging along the radial direction of the inner pipe is pivoted in each through groove. An elastic tightening component is arranged in the inner pipe, and the part of each inner fishing hook below the pivoting position is connected with the elastic tightening component. The hydraulic pushing block is sleeved above the elastic tightening assembly in the inner pipe, pushing lugs are arranged on the outer side of the hydraulic pushing block, and each pushing lug can extend into each through groove and can abut against each inner fishing hook. The fishing tool capable of radially tightening in multiple sizes can effectively grip the underground fish during fishing, continuously provides gripping force in the lifting process, and avoids the situation that the underground fish falls again in the lifting process; meanwhile, the underground fish in a certain size range can be salvaged, and the salvage range is wide.
Description
Technical Field
The invention relates to the technical field of underground fishing, in particular to a fishing tool capable of radially tightening in multiple sizes.
Background
According to the current situation of exploration and development, areas which are easy to drill, such as shallow buried depth, good geological structure, less fracture development and the like, basically enter the late stage of development, the drilling main battlefield is transferred to areas with complex geological conditions, insufficient stratum cognition, complex bottom hole pressure and the like, drilled wells are deeper and deeper, well tracks are more and more complex, and horizontal wells gradually become mainstream. Drilling in the severe geological environment is very easy to induce downhole accidents, such as necking and squeezing of a drilling tool during the drilling process of a salt-gypsum layer; furthermore, the friction resistance torque of the deflecting section of some large-displacement wells is large, if the drilling tool is easily worn and partially damaged by gravel rocks which are difficult to drill, and the drilling tool is more easily broken under the severe environment of high temperature and high pressure; moreover, even after drilling is completed, the measuring tool is very likely to fall off during logging in the later period and other field tests, and underground fish falls are formed.
However, the conventional fishing method on site mainly comprises the steps of milling, wire making and then taking out, but the process is slow and the difficulty is high; meanwhile, the method can only salvage the underground fish with fixed shape and fixed size, and the milling tool is easy to block when being put down, so that the salvage of the underground fish with non-specific shape is difficult; in addition, the tool capable of fishing soft fish such as cables and the like is not provided with a locking device, and the fish can easily fall off in the lifting process.
Therefore, the inventor provides a fishing tool with multiple sizes and radial tightening capability by virtue of experience and practice of related industries for many years, so as to overcome the defects in the prior art.
Disclosure of Invention
The invention aims to provide a fishing tool capable of radially tightening in multiple sizes, which can effectively grip underground fish during fishing, continuously provide gripping force in the lifting process and avoid the situation that the underground fish falls off again in the lifting process; meanwhile, the underground fish in a certain size range can be salvaged, and the salvage range is wide.
The invention aims to realize the purpose, and the fishing tool capable of radially tightening in multiple sizes comprises an outer pipe and an inner pipe which is sleeved and fixed in the outer pipe at intervals; at least two outer fishing hooks are fixed at the bottom end of the outer pipe at intervals along the circumferential direction of the outer pipe, at least two through grooves are formed in the lower pipe wall of the inner pipe at intervals along the circumferential direction of the inner pipe, and the through grooves extend downwards to the bottom of the inner pipe; the number of the through grooves is the same as that of the outer fishing hooks, and each through groove is opposite to the corresponding outer fishing hook in the circumferential direction; an inner fishing hook capable of swinging along the radial direction of the inner pipe is pivoted in each through groove, the lower ends of the inner fishing hook and the outer fishing hook are respectively provided with a hook part, and the hook part of each inner fishing hook is opposite to the corresponding hook part of the outer fishing hook; an elastic tightening component which can lead the lower part of the inner fishing hook to be folded towards the center is arranged in the inner pipe, and the part of each inner fishing hook below the pivoting position is connected with the elastic tightening component; a hydraulic pushing block is sleeved in the inner pipe and above the elastic tightening assembly, the outer side of the hydraulic pushing block is provided with at least two pushing lugs which are uniformly distributed at intervals in the circumferential direction, and the vertical distance between the outer side end of each pushing lug and the axis of the inner pipe is more than or equal to the inner radius of the inner pipe and less than the outer radius of the inner pipe; the quantity that promotes the lug is the same with the quantity of interior fishing hook, and every promotes the lug and can stretch into respectively in each through groove and can support and lean on each interior fishing hook, and supports to lean on the position to be located the pin joint position below of fishing hook in each.
In a preferred embodiment of the present invention, a locking rod is fixed in each through groove, two ends of the locking rod are fixed to two side groove walls of the through groove, a through hole is formed in each inner fishing hook, and the through hole of each inner fishing hook is sleeved on the corresponding locking rod.
In a preferred embodiment of the present invention, the locking rod is a circular rod, and the through hole is a circular hole.
In a preferred embodiment of the present invention, the elastic tightening assembly includes at least two springs and a center buckle, the number of the springs is the same as the number of the inner fishing hooks, one end of each spring is fixedly connected to the corresponding inner fishing hook, the fixed position is located below the pivot position of the inner fishing hook, and the other end of each spring is fixedly connected to the center buckle.
In a preferred embodiment of the present invention, the hydraulic pushing block includes a solid cylinder, and each pushing protrusion is fixed on the circumference of the side wall of the solid cylinder at regular intervals.
In a preferred embodiment of the present invention, a sealing ring is fixedly sleeved on the top of the solid column, and the outer diameter of the sealing ring is the same as the inner diameter of the inner tube.
In a preferred embodiment of the invention, an inner edge is formed at the lower end of the inner tube extending inwards, and the sealing ring can abut against the inner edge.
In a preferred embodiment of the present invention, the outer wall of the solid cylinder is tapered with a downward tapered cross section.
In a preferred embodiment of the present invention, the longitudinal section of the pushing projection along the axial direction of the inner tube is triangular.
In a preferred embodiment of the present invention, there are three outer fishing hooks, three through slots, three inner fishing hooks, and three pushing protrusions.
In a preferred embodiment of the present invention, an upper joint is fixedly connected to an upper end of the inner tube.
According to the fishing tool capable of radially tightening in multiple sizes, before fish falling in a well without being tightly gripped, the inner fishing hooks can be radially tightened through the elastic tightening assembly, so that a large gap is formed between the inner fishing hooks and the outer fishing hooks; when the underground fish enters the catching range, the hydraulic pushing block is pushed downwards by means of pressing, so that the gap between the inner fishing hook and the outer fishing hook can be reduced, and the underground fish can be gripped.
Therefore, through the cooperation of outer fishing hook, interior fishing hook and hydraulic pressure promotion piece, under the condition that outer fishing hook seizes or hooks the fish that falls in the pit, can provide a reverse holding power through interior fishing hook, tightly seize the fish that falls in the pit between outer fishing hook and interior fishing hook, or only rely on the holding power effect of each interior fishing hook also can effectively seize the fish that falls in the pit, and then realize the seizure to the fish that falls in the pit, and constantly provide the gripping power at the process of grasping lifting, prevent to lift the in-process interior fishing hook and loosen, avoid catching the thing and drop once more, guaranteed the reliability of salvaging. Meanwhile, the fishing tool provided by the invention can be used for fishing the underground falling fish in a certain size range instead of the underground falling fish in a certain size range, is suitable for the falling fish in various sizes, and has a wider fishing range. The whole fishing tool is simple in structure, the catching process can be controlled only by controlling the pressure of the drilling fluid, and the fishing tool is simple and convenient to operate.
Drawings
The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention.
Wherein:
FIG. 1: the invention provides a structural schematic diagram of a fishing tool with multiple sizes and radial tightening capability.
FIG. 2: the invention provides a top view of a multi-sized radially collapsible fishing tool.
FIG. 3: the invention provides a structural schematic diagram of an outer pipe and an outer fishing hook.
FIG. 4: in order to provide a structural schematic view of the inner tube of the present invention, only one through groove is illustrated in fig. 4.
FIG. 5: the invention provides a structural schematic diagram of an inner fishing hook.
FIG. 6: the invention provides a structural schematic diagram of the inner fishing hook in the initial position.
FIG. 7: the structure of the inner fishing hook is schematically shown after the inner fishing hook is close to the outer fishing hook under the thrust action of the hydraulic pushing block.
FIG. 8: for the structural schematic diagram of the hydraulic pushing block provided by the invention, only one pushing lug is illustrated in the figure 8.
The reference numbers illustrate:
1. an outer tube;
2. an inner tube; 21. penetrating through the groove; 22. a locking lever; 23. an inner edge;
3. an outer fishing hook;
4. an inner fishing hook; 41. a through hole;
5. an elastic tightening assembly; 51. a spring; 52. a central buckle;
6. a hydraulic pushing block; 61. a solid cylinder; 62. pushing the projection; 63. a seal ring;
7. and (4) an upper connector.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.
As shown in fig. 1 to 8, the present embodiment provides a fishing tool with multiple dimensions capable of being radially tightened, which includes an outer pipe 1 and an inner pipe 2 fixed in the outer pipe 1 at intervals.
Wherein, the bottom of outer tube 1 is fixed with two at least outer fishing hooks 3 along its circumference is even at intervals, is equipped with two at least penetrating groove 21 along its circumference is even at intervals on the lower part pipe wall of inner tube 2, penetrates groove 21 downwardly extending to the bottom of inner tube 2. The number of the through grooves 21 is the same as that of the outer fishing hooks 3, and each through groove 21 is arranged opposite to the corresponding outer fishing hook 3 in the circumferential direction. An inner fishing hook 4 capable of swinging along the radial direction of the inner pipe 2 is pivoted in each through groove 21, the lower ends of the inner fishing hook 4 and the outer fishing hook 3 are respectively provided with a hook part, and the hook part of each inner fishing hook 4 is opposite to the corresponding hook part of the outer fishing hook 3.
An elastic tightening component 5 which can lead the lower part of the inner fishing hook 4 to be folded towards the center is arranged in the inner pipe 2, and the part of each inner fishing hook 4 below the pivoting position is connected with the elastic tightening component 5. The hydraulic pushing block 6 is sleeved above the elastic tightening assembly 5 in the inner tube 2, the outer side of the hydraulic pushing block 6 is provided with at least two pushing lugs 62 which are uniformly distributed at intervals in the circumferential direction, and the vertical distance between the outer side end of each pushing lug 62 and the axis of the inner tube 2 is larger than or equal to the inner radius of the inner tube 2 and smaller than the outer radius of the inner tube 2. The number of the pushing lugs 62 is the same as that of the inner fishing hooks 4, each pushing lug 62 can extend into each through groove 21 and can abut against each inner fishing hook 4, and the abutting position is located below the pivoting position of each inner fishing hook 4.
Specifically, the outer fishing hook 3 and the inner fishing hook 4 are similar in structure and each include a strip-shaped plate body and a sharp hook formed at the bottom end of the strip-shaped plate body, the strip-shaped plate body should have a certain thickness to ensure the fishing strength, and the sharp hook constitutes the hook portion of each fishing hook. The top of the outer pipe 1 is welded and fixed with the top of the inner pipe 2, and the outer fishing hook 3 is welded at the lower end of the outer pipe 1. The axial length of outer tube 1 and inner tube 2 is the same, and the internal diameter of outer tube 1 is greater than the external diameter of inner tube 2, and the interval between the two forms annular space, and this annular space can provide the activity space for the radial swing of interior fishing hook 4. The number of the outer fishing hooks 3, the through grooves 21, the inner fishing hooks 4 and the pushing lugs 62 is the same, for example, three outer fishing hooks are provided in the present embodiment, and the outer fishing hooks, the through grooves 21, the inner fishing hooks and the pushing lugs are distributed at intervals of 120 ° in the circumferential direction. Of course, other numbers may be provided as needed, and this embodiment is merely an example.
During installation, in order to facilitate installation of the hydraulic pushing block 6, after the outer pipe 1 and the inner pipe 2 are welded, the pushing lugs 62 of the hydraulic pushing block 6 are aligned with the through grooves 21 and pushed upwards from the bottom of the inner pipe 2; then, each inner fishing hook 4 and the elastic tightening component 5 are installed, and each pushing lug 62 is ensured to be capable of abutting against the inner fishing hook 4, and the abutting position is located below the pivoting position of each inner fishing hook 4, so that the pivot of the pivoting position is prevented from being damaged when the pushing lug 62 moves downwards. Generally, the pivot of the pivot position is arranged close to the outer side of the inner tube 2, and the thickness of the inner fishing hook 4 along the radial direction of the inner tube 2 is slightly smaller than the wall thickness of the inner tube 2, so as to ensure that the pushing convex block 62 can abut against the inner fishing hook 4 below the pivot position.
In the initial position, the lower part of each inner grappling hook 4 is folded towards the centre under the action of the elastic tightening assembly 5, assuming a tightened state, in the position shown in fig. 6, the clearance between the hook part of the inner grappling hook 4 and the outer grappling hook 3 is large, which constitutes a catching range. When fishing the annular column type of the underground fish, the side wall of the underground fish easily enters the catching range. When the fishing tool is used, the upper end of the inner pipe 2 is fixed with the drill string, the drill string is used for carrying the fishing tool to go into a well, and drilling fluid does not need to be injected into the drill string in the running-in process.
If the fished underground fish is in an annular column shape, when the fishing tool is lowered to a certain depth, the side wall of the underground fish enters the gap between the inner fishing hook 4 and the outer fishing hook 3. At the moment, drilling fluid is injected into the inner cavity of the pipe column, the hydraulic pushing block 6 is pushed to move downwards slowly by pressure generated by the drilling fluid, and a pushing force is given to the inner fishing hook 4 in the moving process, so that the hook part of the inner fishing hook 4 gradually swings and outwards approaches to the outer fishing hook 3, the gap between the outer fishing hook 3 and the inner fishing hook 4 is gradually reduced, the position shown in the figure 7 is reached, and finally, the underground fish is gripped.
The position of the inner fishing hook 4 after swinging outwards swings by a certain angle relative to the initial position, and the specific outward swinging degree is determined by the size of the pushing bump 62 and the size of the fished underground fish, so that the inner fishing hook 4 can still be located at an inward furling position after swinging outwards, can also be located at a vertical position, and can also be located at an outward slightly inclined opening position, and the purpose of clamping the fish can be achieved. Later when lifting fishing tool, because the action of gravity of drilling fluid, hydraulic pressure promotes piece 6 still can provide thrust to interior fishing hook 4 for interior fishing hook 4 can constantly provide the grip, prevents to lift the in-process fish and appear the phenomenon of dropping.
For example, when the fish is a drill pipe having a joint, the joint generally has an outer diameter larger than that of the drill pipe, and a step is formed at the joint of the drill pipe and the joint, and the inner wall of the entire drill pipe is smooth. When salvaging, this joint gets into after catching the scope, has at least one outer fishing hook 3 and can block the step, and fishing hook 4 can provide a holding power to the inner wall of joint in each after suppressing simultaneously, and through the cooperation of fishing hook 3 and interior fishing hook 4 outside fishing hook, can effectively promptly this fish that falls in the pit, the realization is salvaged. If the inner wall of the underground fish also has steps, the inner fishing hook 4 can be clamped on the steps of the inner wall during fishing, and the fishing is more reliable. If the inner wall and the outer wall of the underground fish do not have steps, the fishing hook can smoothly grasp the fish by mainly utilizing the supporting force of each inner fishing hook 4 during fishing, so that the fishing is realized. As for the underground fish in a certain size range, as long as the side wall of the underground fish can enter the catching range, the underground fish can be grasped by matching the outer fishing hook 3 and the inner fishing hook 4 or the underground fish can be grasped only by the supporting force of the inner fishing hook 4, so that the fishing is realized, the fishing range is wider, and the underground fish is not limited to a fixed size.
If the fished underground fish is not in a regular fixed shape, for example, soft fish such as a steel wire rope, a cable and the like, drilling fluid does not need to be added in the fishing process, the fishing tool is only required to be put into the underground for a certain depth, and the steel wire rope is hooked by the hook parts of the outer fishing hook 3 and the inner fishing hook 4. Certainly, in order to salvage more reliably, can also suppress after wire rope gets into the catching range for inner salvage hook 4 swings and is close to with outer salvage hook 3, plays the effect of locking when hooking wire rope, avoids wire rope to drop in the process of carrying.
Therefore, the multi-size fishing tool capable of being radially tightened in the embodiment can radially tighten each inner fishing hook 4 through the action of the elastic tightening assembly 5 before the fish falling in the unclamped well is lowered, so that a larger gap is formed between each inner fishing hook 4 and each outer fishing hook 3; when the underground fish enters the catching range, the hydraulic pushing block 6 is pushed downwards by means of pressing, so that the gap between the inner fishing hook 4 and the outer fishing hook 3 can be reduced, and the underground fish can be grasped.
Therefore, through the cooperation of outer salvage hook 3, interior salvage hook 4 and hydraulic pressure promotion piece 6, under the condition that outer salvage hook 3 seizes or hooks the fish that falls in the pit, can provide a reverse holding power through interior salvage hook 4, tightly seize the fish that falls in the pit between outer salvage hook 3 and interior salvage hook 4, or only rely on the holding power effect of each interior salvage hook 4 also can effectively seize the fish that falls in the pit, and then realize the seizure to the fish that falls in the pit, and constantly provide the holding power at the in-process of grasping lifting, prevent to lift in-process interior salvage hook 4 and loosen, avoid catching the thing and drop once more, guaranteed the reliability of salvaging. Meanwhile, the fishing tool in the embodiment can be used for fishing the underground falling fish within a certain size range instead of the underground falling fish of a certain size, is suitable for the falling fish of various sizes, and has a wider fishing range. The whole fishing tool is simple in structure, the catching process can be controlled only by controlling the pressure of the drilling fluid, and the fishing tool is simple and convenient to operate.
The fishing tool in the present embodiment is mainly suitable for fishing annular columnar fish in the well or soft fish such as wire rope and cable, and can be used for fishing small instruments having a shape similar to that of the annular columnar fish in the well. Meanwhile, the fishing tool in the embodiment is not only suitable for fishing of vertical wells, but also suitable for fishing of horizontal wells.
In a specific implementation manner, in order to facilitate the swing of the inner fishing hook 4, as shown in fig. 1, 4 and 5, a locking rod 22 is fixed in each through groove 21, two ends of the locking rod 22 are fixed to two side groove walls of the through groove 21, a through hole 41 is formed in each inner fishing hook 4, and the through hole 41 of each inner fishing hook 4 is sleeved on the corresponding locking rod 22.
Here, the locking lever 22 is a straight lever and constitutes a pivot of the pivotal position, and the inner grappling hook 4 can swing within a certain angle around the locking lever 22. Generally, the locking lever 22 is a circular lever and the through hole 41 is a circular hole to ensure smooth swinging.
Further, in order to facilitate radial tightening of each inner fishing hook 4 in the initial position, as shown in fig. 1 and 2, the elastic tightening assembly 5 includes at least two springs 51 and a center buckle 52, the number of the springs 51 is the same as that of the inner fishing hooks 4, one end of each spring 51 is fixedly connected to the corresponding inner fishing hook 4, the fixed position is located below the pivot position of the inner fishing hook 4, and the other end of each spring 51 is fixedly connected to the center buckle 52.
One end of the spring 51 is generally welded to the back of the inner grappling hook 4 (i.e. the side opposite to the pointed hook), and the other end of the spring 51 is welded and fixed to the central buckle 52. The center button 52 can be either an annular body or a block body. In this way, when the catching operation is not performed on the fish falling in the well, since the fixed point between the spring 51 and the inner fishing hook 4 is located below the pivotal position, that is, below the locking lever 22, the lower portion of each inner fishing hook 4 is tightened to the center by the tensile force of each spring 51, so that the gap between the lower end of the outer fishing hook 3 is increased, and the catching operation is performed subsequently.
The function of the entire elastic tightening assembly 5 is mainly to tighten the inner grappling hook 4 in the initial position, ensuring a large clearance with the outer grappling hook 3. In the process of grasping the fish by pressing after the fish in the well enters the catching range, whether the spring 51 is broken or not does not affect the whole fishing process. Of course, the elastic tightening assembly 5 may also take other forms, and this embodiment is only for illustration.
Further, for convenience of processing and installation, as shown in fig. 8, the hydraulic pushing block 6 includes a solid cylinder 61, and pushing protrusions 62 are fixed on the circumference of the side wall of the solid cylinder 61 at regular intervals. When the underground fish enters the catching range and is pressed, the whole hydraulic pushing block 6 descends under the hydraulic action of the drilling fluid, and each pushing lug 62 pushes the lower part of each inner fishing hook 4 to swing outwards, so that the gap between each inner fishing hook 4 and each outer fishing hook 3 is reduced, and the underground fish is grasped or hooked.
In practical application, in order to ensure smooth pressure rise during pressing, a sealing ring 63 is fixedly sleeved on the top of the solid column 61, and the outer diameter of the sealing ring 63 is the same as the inner diameter of the inner tube 2. The sealing ring 63 is preferably a rubber ring to play a role of sealing and suppressing pressure during pressing, so that the hydraulic pushing block 6 can smoothly descend.
Further, in order to limit the downward movement position of the hydraulic pushing block 6 and avoid excessive downward movement of the hydraulic pushing block 6 when the drilling fluid pressure is too high, as shown in fig. 1 and 4, an inner edge 23 is formed by extending the lower end of the inner tube 2 inwards, and the sealing ring 63 can abut against the inner edge 23. It is understood that, due to the through groove 21, the inner edge 23 is also formed by a plurality of arc edges arranged at intervals along the circumferential direction. During machining and installation, the hydraulic pushing block 6 can be installed inside the inner pipe 2, and after the inner fishing hook 4 and the elastic tightening assembly 5 are installed, the inner edge 23 can be welded and fixed.
In addition, the outer wall of the general solid column 61 is a conical surface with a downward tapered cross section, which is more convenient for the hydraulic pushing block 6 to move downward and reduces the downward friction force. The pushing projection 62 is triangular along the axial longitudinal section of the inner tube 2, the outer side tip of the general triangle is located at the middle upper part of the whole triangle, and is not located at the bottom of the whole triangle, the outer side tip of the general triangle can abut against the inner fishing hook 4, and the inner fishing hook 4 is more smoothly pushed downwards when being pressed. Of course, the hydraulic pushing block 6 may also adopt other structural forms as required, and this embodiment is only for illustration.
Further, an upper sub 7 is fixedly attached to the upper end of the inner pipe 2 for convenient connection to a drill string when in use. The upper joint 7 is a tubular body, is provided with a male buckle, and can be matched with a female buckle on a drill stem to realize the fixation of the upper joint and the female buckle.
The above are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention. Any equivalent changes and modifications that can be made by one skilled in the art without departing from the spirit and principles of the invention should fall within the protection scope of the invention.
Claims (11)
1. A fishing tool capable of being radially tightened in multiple sizes is characterized by comprising an outer pipe and inner pipes which are sleeved and fixed in the outer pipe at intervals;
at least two outer fishing hooks are fixed at the bottom end of the outer pipe at intervals along the circumferential direction of the outer pipe, at least two through grooves are formed in the lower pipe wall of the inner pipe at intervals along the circumferential direction of the inner pipe, and the through grooves extend downwards to the bottom of the inner pipe; the number of the through grooves is the same as that of the outer fishing hooks, and each through groove is opposite to the corresponding outer fishing hook in the circumferential direction; an inner fishing hook capable of swinging along the radial direction of the inner pipe is pivoted in each through groove, the lower ends of the inner fishing hook and the outer fishing hook are respectively provided with a hook part, and the hook part of each inner fishing hook is opposite to the corresponding hook part of the outer fishing hook;
an elastic tightening assembly capable of enabling the lower part of each inner fishing hook to be folded towards the center is arranged in the inner pipe, and the part of each inner fishing hook below the pivoting position of the inner fishing hook is connected with the elastic tightening assembly; a hydraulic pushing block is sleeved in the inner pipe and above the elastic tightening assembly, at least two pushing convex blocks which are uniformly distributed at intervals in the circumferential direction are arranged on the outer side of the hydraulic pushing block, and the vertical distance between the outer side end of each pushing convex block and the axis of the inner pipe is greater than or equal to the inner radius of the inner pipe and smaller than the outer radius of the inner pipe; the number of the pushing lugs is the same as that of the inner fishing hooks, each pushing lug can extend into each through groove and can abut against each inner fishing hook, and the abutting position is located below the pivoting position of each inner fishing hook.
2. A multi-sized radially tightenable fishing tool as defined in claim 1,
and a locking rod is fixed in each through groove, two ends of the locking rod are fixed with the groove walls on two sides of the through groove, a through hole is formed in each inner fishing hook, and the through hole of each inner fishing hook is sleeved on the corresponding locking rod.
3. A multi-sized radially tightenable fishing tool as defined in claim 2,
the locking lever is a circular lever, and the through hole is a circular hole.
4. A multi-sized radially tightenable fishing tool as defined in claim 1,
the elastic tightening assembly comprises at least two springs and a central buckle, the number of the springs is the same as that of the inner fishing hooks, one end of each spring is fixedly connected with the corresponding inner fishing hook, the fixed position is located below the pivoting position of the inner fishing hook, and the other end of each spring is fixedly connected with the central buckle.
5. A multi-sized radially tightenable fishing tool as defined in claim 1,
the hydraulic pushing block comprises a solid cylinder, and the pushing convex blocks are uniformly fixed on the circumferential direction of the side wall of the solid cylinder at intervals.
6. A multi-sized radially tightenable fishing tool as defined in claim 5,
and a sealing ring is fixedly sleeved on the top of the solid column body, and the outer diameter of the sealing ring is the same as the inner diameter of the inner tube.
7. A multi-sized radially tightenable fishing tool as defined in claim 6,
an inner edge is formed by extending inwards at the lower end of the inner pipe, and the sealing ring can abut against the inner edge.
8. A multi-sized radially tightenable fishing tool as defined in claim 5,
the outer wall of the solid cylinder is a conical surface with a downward tapered cross section.
9. A multi-sized radially tightenable fishing tool as defined in claim 1,
the longitudinal section of the pushing lug along the axial direction of the inner tube is triangular.
10. A multi-sized radially tightenable fishing tool as defined in claim 1,
the three outer fishing hooks, the three through grooves, the three inner fishing hooks and the three pushing lugs are arranged in total.
11. A multi-sized radially tightenable fishing tool as defined in claim 1,
the upper end of the inner pipe is fixedly connected with an upper joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010932729.8A CN114151036B (en) | 2020-09-08 | 2020-09-08 | Multi-size fishing tool capable of radial tightening |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010932729.8A CN114151036B (en) | 2020-09-08 | 2020-09-08 | Multi-size fishing tool capable of radial tightening |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114151036A true CN114151036A (en) | 2022-03-08 |
| CN114151036B CN114151036B (en) | 2024-07-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010932729.8A Active CN114151036B (en) | 2020-09-08 | 2020-09-08 | Multi-size fishing tool capable of radial tightening |
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| CN (1) | CN114151036B (en) |
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| CN115142806A (en) * | 2022-06-15 | 2022-10-04 | 淮安市井神钻采机具有限公司 | Electric drive's fish fishing device that falls |
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| CN115142806A (en) * | 2022-06-15 | 2022-10-04 | 淮安市井神钻采机具有限公司 | Electric drive's fish fishing device that falls |
| CN115142806B (en) * | 2022-06-15 | 2024-06-04 | 淮安市井神钻采机具有限公司 | Electric drive's fish fishing device |
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| CN114151036B (en) | 2024-07-26 |
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