Fly line underwater oscillation simulation device

Abstract

The invention provides a fly line underwater oscillation simulation device which comprises two fixers arranged in water and a rotating assembly located between the two fixers, and the two ends of a cable stretch across the rotating assembly and are fixed by the fixers; the rotating assembly comprises two supporting rotating structures and a connecting rod connected between the two supporting rotating structures, each supporting rotating structure at least comprises a supporting rod and a rotating rod, one end of each rotating rod is rotationally connected with the corresponding supporting rod, and the other end of each rotating rod is rotationally connected with the corresponding connecting rod; and the rotating rod rotates to drive the connecting rod to swing so as to generate a simulated underwater oscillation effect on the cable connected to the connecting rod.

Description

Technical Field

[0001] The present invention belongs to the technical field of cable testing, and particularly relates to a flying wire underwater oscillation simulation device. Background Art

[0002] The electric flying wire of the Christmas tree is mainly composed of a watertight connector and a flying wire cable, and it is widely used in the fields of offshore oil and gas, shipwreck rescue, and subsea observation networks. Such cables need to be in the marine wave environment for a long time. Specifically, during application, the connector part is usually in a locked and fixed state, while the end flying wire cable part is generally in a vertically suspended and non-fixed state. Therefore, the oscillation generated by the marine wave places more stringent requirements on the durability and electrical performance of the flying wire cable part.

[0003] Since the flying wire is often underwater 500m or even deeper in the actual use environment, conducting oscillation tests in the actual deep-sea environment will face problems of high difficulty, high cost, and high risk, and may even be impossible to conduct. Therefore, how to verify whether the durability and electrical performance of the flying wire will be affected under the oscillation environment is an urgent problem to be solved. Summary of the Invention

[0004] This application mainly solves the environmental problem of simulating the flying wire under water wave vibration. For this technical problem, a flying wire underwater oscillation simulation device is proposed, and the specific technical solutions are as follows:

[0005] The flying wire underwater oscillation simulation device includes two fixators arranged in water and a rotating assembly located between the two fixators. Both ends of the cable span across the rotating assembly and are fixed by the fixators;

[0006] The rotating assembly includes two support rotating structures and a connecting rod connected between the two support rotating structures. The support rotating structure includes at least one set including a support rod and a rotating rod. One end of the rotating rod is rotatably connected to the support rod, and the other end of the rotating rod is rotatably connected to the connecting rod;

[0007] The rotation of the rotating rod drives the connecting rod to swing, generating a simulated underwater oscillation effect on the cable connected to the connecting rod.

[0008] Further, a card slot is provided on the connecting rod and a block for closing the opening of the card slot, so that the cable is restricted between the card slot and the block.

[0009] Further, the distance between the rotation axis of the connecting rod and the self-rotation axis of the rotating rod is set to be adjustable.

[0010] Further, a first elongated hole is provided along the length direction of the rotating rod, and the connecting rod is connected to the rotating rod through the first elongated hole.

[0011] Further, it further includes a driving component, the driving component includes at least one transmission rod connected to the rotating rod, and a motor for driving the transmission rod to rotate and then driving the rotating rod to rotate.

[0012] Further, the motor drives the rotating rod to rotate through the cooperation of a sprocket and a chain.

[0013] Further, two transmission rods are provided, and the motor drives the two transmission rods to rotate simultaneously through the cooperation of a sprocket and a chain.

[0014] Further, it further includes a tensioning component, the tensioning component includes a fourth sprocket fixed on the two transmission rods, a second chain simultaneously meshed and connected to the two fourth sprockets, and a third sprocket arranged inside the second chain and kept meshed and connected to one side of the second chain, and the third sprocket can move outward to the second chain to adjust the tension of the second chain.

[0015] Further, the tensioning component further includes a bracket and a mounting plate adjustably installed on the bracket, and the third sprocket is installed on the mounting plate.

[0016] Further, it further includes a fixing plate, two spaced fixing blocks are arranged on the fixing plate, rotatable screws are arranged on the fixing blocks, and the motor is fixed by the tightened screws in contact.

[0017] Further, a light-shielding sheet is fixed at the end of the transmission rod and rotates with the transmission rod, and an optical detection sensor cooperating with the light-shielding sheet is arranged outside the light-shielding sheet.

[0018] Further, it further includes a water tank, and the fixator and the rotating component are fixed inside the water tank;

[0019] Ladders are fixed on both the inner and outer sides of the water tank;

[0020] And / or a safety light curtain is fixed at the opening of the water tank.

[0021] The beneficial effect of the present invention is that the device of the present application can more realistically simulate the oscillating environment generated by the seawater fluctuation to verify the durability and electrical performance of the cable structure at the end of the electrical flying wire. Description of the Drawings

[0022] Figure 1 It shows the overall structural schematic diagram of the flying wire underwater oscillation simulation device in the embodiment;

[0023] Figure 2 It shows the layout state schematic diagram of the rotating component, the first fixator and the second fixator in the embodiment;

[0024] Figure 3 It shows the structural schematic diagram of the rotating component in the embodiment;

[0025] Figure 4 Shown is in the embodiment Figure 3 A partial enlarged view at location A in;

[0026] Figure 5 Shown is a schematic structural diagram of the drive assembly in the embodiment;

[0027] Figure 6 Shown is in the embodiment Figure 5 A partial enlarged view at location B in;

[0028] Figure 7 Shown is a schematic structural diagram of the fixing structure of the motor in the embodiment;

[0029] Figure 8 Shown is in the embodiment Figure 3 A partial enlarged view at location C in;

[0030] Figure 9 Shown is a schematic structural diagram of the fixing structure of the third sprocket in the embodiment. Detailed implementation manners

[0031] In the following description, certain specific details are set forth in order to provide a thorough understanding of the various embodiments. However, those skilled in the art should understand that the present invention may be practiced without these details. In other instances, well-known structures have not been shown or described in detail to avoid unnecessarily obscuring the description of the embodiments. Unless the context otherwise requires, throughout the specification and the appended claims, the word "comprising" shall be interpreted in an open, inclusive sense, i.e., as "including but not limited to".

[0032] As used throughout this specification, the phrase "an embodiment" or "embodiment" means that a particular feature, structure, or characteristic related to the embodiment is included in at least one embodiment. Thus, the appearances of the phrase "in an embodiment" or "in an embodiment" throughout this specification are not necessarily all referring to the same embodiment. Additionally, the specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Further, as used in this specification and the appended claims, the singular forms "a / an" and "the" include plural referents unless the context clearly dictates otherwise. It should also be noted that the term "or" generally is used in its sense including "and / or" unless the context clearly dictates otherwise.

[0033] For the purpose of simulating the environment in which the flying wire 1 is subjected to water wave vibrations underwater to better verify the durability and electrical performance of the cable, a flying wire underwater oscillation simulation device provided by the present application includes a rotating assembly 10 that provides rotational power, and a first fixture 20 and a second fixture 30 disposed on both sides of the rotating assembly 10. The first fixture 20 and the second fixture 30 are respectively used to fix the connector end and the flying wire end. When the rotating assembly 10 is driven, it can form a relatively stable movement trajectory, so that the flying wire 1 fixed between the first fixture 20 and the second fixture 30 should penetrate the plane where the movement trajectory is located. At the same time, a certain position on the flying wire 1 between the first fixture 20 and the second fixture 30 is connected to the rotating assembly 10 to maintain the same movement trajectory as the rotating assembly 10.

[0034] In one embodiment, through the flying wire underwater oscillation simulation device, after the flying wire 1 is fixed by the first fixture 20 and the second fixture 30 in a non-straightened state, the middle part of the flying wire 1 is connected to the rotating assembly 10. The rotating assembly 10 is driven by irregular rotation, which can simulate the oscillation effect generated by the seawater flow and verify the durability and electrical performance of the cable in such an environment.

[0035] In one embodiment, through the flying wire underwater oscillation simulation device, after the flying wire 1 is fixed by the first fixture 20 and the second fixture 30 in a straightened state, the middle part of the flying wire 1 is connected to the rotating assembly 10. The rotating assembly 10 is driven to make the flying wire 1 maintain a conical rotation under the condition of the minimum bending radius of the flying wire 1 for a long time, which can simulate a more extreme working condition state and verify the durability and electrical performance of the cable in such an environment.

[0036] In an embodiment, the penetration state of the flying wire 1 fixed between the first fixture 20 and the second fixture 30 with respect to the plane where the movement trajectory is located does not need to be strictly restricted, and it only needs to satisfy that the connection line of the main bodies of the first fixture 20 and the second fixture 30 penetrates the plane where the movement trajectory is located. That is, when the flying wire 1 is fixed between the first fixture 20 and the second fixture 30 in a straightened state, the flying wire 1 can be completely perpendicular to the plane where the movement trajectory is located, or can have an inclination angle (non-perpendicular) with the plane where the movement trajectory is located.

[0037] In an embodiment, the rotating assembly 10 and the first fixture 20 and the second fixture 30 on both sides can also be completely immersed in water, and the flying wire 1 is always kept completely immersed in water. It can be an open water environment or an artificially set closed water environment, further fitting the resistance of the water wave and improving the meticulousness and authenticity of the verification result.

[0038] In an embodiment, since there are only structural differences between the first fixture 20 and the second fixture 30 and no substantial functional differences, the specific installation positions of the two are not limited. The first fixture 20 can fix either the connector end or the flying wire end.

[0039] In an embodiment, the rotating assembly 10 is configured with a double-sided support plus connecting rod structure to meet the simulation requirements for the conical rotation of the flying wire 1. That is, the rotating assembly 10 should include two support rotating structures and a connecting rod 10a connected between the two support rotating structures. Each support rotating structure includes a support rod 10b and a rotating rod 10c. One end of the rotating rod 10c is rotatably connected to the support rod 10b, and the other end of the rotating rod 10c is rotatably connected to the connecting rod 10a. By the rotation of the rotating rod 10c on the support rod 10b, the connecting rod 10a is driven to make a circular rotational movement as a whole. The support rod 10b is used to fixedly support the entire rotating assembly 10 and keep it stable.

[0040] In one embodiment, in each support rotating structure, only one of the support rod 10b and the rotating rod 10c is provided; in another embodiment, in each support rotating structure, two sets of the support rod 10b and the rotating rod 10c are provided, and a gap for accommodating the connecting rod 10a is provided between the two sets of the support rod 10b and the rotating rod 10c, while also ensuring that the connecting rod 10a can be normally driven to rotate. This embodiment can provide a more stable connection and improve the stability of the device.

[0041] In an embodiment, a card slot 10d is provided on the connecting rod 10a, and a block 10e is provided in a mating manner to close the card slot 10d, so as to facilitate connecting the flying wire 1 to the connecting rod 10a through the cooperation of the card slot 10d and the block 10e, and enabling the connecting rod 10a to drive the flying wire 1 to move.

[0042] In one embodiment, the flying wire 1 is stuck in the card slot 10d in a fixed state, that is, the flying wire 1 is fixed in the card slot 10d by the block 10e, and the flying wire 1 cannot move in the card slot 10d; in another embodiment, the flying wire 1 is restricted in the card slot 10d in a movable state, that is, the block 10e is only used to close the opening of the card slot 10d to prevent the flying wire 1 from disengaging from the card slot 10d, and the flying wire 1 can move in the card slot 10d, such as axial sliding and rotation.

[0043] In an embodiment, a strip-shaped hole 10f is provided along the length direction of the rotating rod 10c. The connecting rod 10a is adjustably connected to the rotating rod 10c through this strip-shaped hole 10f. That is, the connecting rod 10a can adjust its connection position on the rotating rod 10c through this strip-shaped hole 10f, thereby adjusting the rotation radius of the connecting rod 10a itself. Exemplarily, according to the provisions of API 17F standard, the rotation angle of the flying wire oscillating underwater can be executed at 30°, and the current minimum dynamic bending diameter of the flying wire adopted is 800 mm, that is, the semi-circular height of the flying wire rotation is 400 mm. Therefore, by adjusting the connection position of the connecting rod 10a on the rotating rod 10c, the distance between the connection position of the connecting rod 10a and the rotation axis of the rotating rod 10c can be made 400 mm, or adjusted to other distances to conduct cable performance tests under different environments.

[0044] In an embodiment, the rotation of the rotating rod 10c in the rotating assembly 10 needs to be set by an external driver. To avoid interfering with the conical rotation of the flying wire 1, a driving assembly 40 is provided to drive the rotation of the rotating rod 10c. The driving assembly 40 includes a transmission rod 40a, a first sprocket 40b, a first chain 40c, a motor 40d, and a second sprocket 40e. The motor 40d drives the transmission rod 40a to rotate through the first sprocket 40b, the second sprocket 40e, and the first chain 40c. The transmission rod 40a provides an extended drive to avoid interfering with the conical rotation of the flying wire 1.

[0045] In other embodiments, transmission components such as belts and toothed belts can be used to transmit the rotational output of the motor 40d to the transmission rod 40a. The specific implementation of the power transmission purpose is not affected. Just choosing chain drive has advantages such as accurate transmission ratio and large center distance range, and can prevent elastic slip phenomenon.

[0046] In one embodiment, one end of the transmission rod 40a is fixed to the rotating rod 10c, and the rotation axis of the rotating rod 10c should be coaxial with the transmission rod 40a. The other end of the transmission rod 40a is fixed with the first sprocket 40b, and the output shaft of the motor 40d is fixed with the second sprocket 40e. The first sprocket 40b, the second sprocket 40e, and the first chain 40c are meshed and connected.

[0047] In another embodiment, one end of the transmission rod 40a is connected to the rotating rod 10c in a transmission manner. In this way, it is not necessary for the rotation axis of the rotating rod 10c to be coaxial with the transmission rod 40a. For example, the rotation of the transmission rod 40a can be transmitted to the rotating rod 10c through gear meshing. The other end of the transmission rod 40a is fixed with the first sprocket 40b, and the output shaft of the motor 40d is fixed with the second sprocket 40e. The first sprocket 40b, the second sprocket 40e, and the first chain 40c are meshed and connected.

[0048] In the implementation scheme, the driving component 40 can drive the rotating rod 10c in one rotating component 10 to rotate, making the rotating rod 10c in another rotating component 10 as a slave, and utilizing the connection relationship with the connecting rod 10a to assist the connecting rod 10a to rotate stably; it can also drive the rotating rods 10c in the two rotating components 10 to rotate at the same time.

[0049] In one embodiment, the driving component 40 drives the rotating rods 10c in the two rotating components 10 to rotate simultaneously. Then, based on the transmission rod 40a, sprocket one 40b, chain one 40c, motor 40d and sprocket two 40e, the driving component 40 has two transmission rods 40a and two sprockets one 40b. The rotating rod 10c in each rotating component 10 is connected to sprocket one 40b through the transmission rod 40a, and the chain one 40c is meshed and connected with the sprocket two 40e and the two sprockets 40b at the same time, so that the chain one 40c is stretched in a triangular state to synchronously drive the two transmission rods 40a to rotate through the motor 40d.

[0050] In the implementation scheme, the chain 40c is affected by the tension of the motor 40d for a long time, which may cause wear and looseness and transmission vibration, thereby affecting the constant rotation of the connecting rod 10a. Therefore, the driving component 40 is also equipped with a tensioning component 41 to compensate and maintain the chain state, thereby avoiding the problem of unstable rotation caused by loose vibration during the meshing process.

[0051] The tensioning assembly 41 includes a chain 2 41a, a sprocket 3 41b, a sprocket 41c and a bracket 41d. The bracket 41d is provided with a mounting plate 41e that can be raised and lowered and adjusted to be fixed. The sprocket 3 41b is mounted on the mounting plate 41e. Two sprockets 41c are provided and are respectively fixedly mounted on two transmission rods 40a. The chain 2 41a is meshed and connected with the sprocket 3 41b and the sprocket 4 41c at the same time. The sprocket 3 41b can control the tension of the chain 2 41a by raising and lowering the mounting plate 41e, so as to maintain the tension of the chain 2 41a to compensate for the looseness of the chain 1 40c and cause transmission vibration. It should be noted that when the tensioning assembly 41 is used, two transmission rods 40a need to be adaptively set, and the matching setting of the transmission rod 40a and the sprocket 40b can be set according to different implementation requirements, and it is not limited to that the sprocket 40b must be fixed on the transmission rod 40a. It can also be that when two transmission rods 40a are set, the sprocket 40b is fixed on one of the transmission rods 40a, and the sprocket 40b is not fixed on the other transmission rod 40a.

[0052] In the implementation scheme, the fixation of the motor 40d also has the function of chain tensioning. A fixing plate 42a is provided for placing the motor 40d, and two fixed blocks 42b are arranged at intervals on the fixing plate 42a. The gap between the fixing blocks 42b is larger than the motor 40d. At the same time, a rotatable screw 42c is also provided on the fixing block 42b. When the screws 42c on the fixing blocks 42b on both sides are tightened and abut against the base of the motor 40d, the motor 40d can be fixed; when the chain 40c becomes loose, the screw length of the screws 42c on the fixing blocks 42b on both sides is adjusted to move and change the fixed position of the motor 40d, so as to improve the tension of the chain 40c; a mounting hole can also be separately provided on the base of the motor 40d to cooperate with the fixing plate 42a to realize the fixation of the motor 40d.

[0053] In the implementation scheme, a shading sheet 43b can be fixed at the end of the transmission rod 40a, and an optical detection sensor 43a is arranged on the outside of the shading sheet 43b. The optical detection sensor 43a is fixedly arranged, and the shading sheet 43b rotates with the transmission rod 40a to intermittently shield the light path of the optical detection sensor 43a to record the real-time number of oscillations.

[0054] Example

[0055] This embodiment only provides a more complete and detailed solution in combination with the drawings, and is not intended to be the sole limitation on the invention content of this application, nor is it intended to be the sole limitation on the combination of the above-mentioned components or structures.

[0056] See also Figure 1 and Figure 2 The flying line underwater oscillation simulation device as a whole has a water tank 50a and a rotating component 10, a fixture 1 20 and a fixture 2 30 fixed inside the water tank 50a. The water tank 50a is a frame structure and is formed by a bottom plate and a side plate. Ladders 50b are fixed inside and outside the water tank 50a to facilitate people to enter and exit the water tank 50a. At the same time, a safety grating 50c is fixed at the opening of the water tank for safe operation detection during the test work to prevent people from accidentally entering the water tank 50a during work.

[0057] See also Figure 2 Fixer 1 20 and fixer 2 30 are arranged on both sides of the rotating assembly 10, and are used to fix the connector end and the flying wire end of the cable respectively. Fixer 1 20 and fixer 2 30 are fixed by an embracing type clamping method, and the connector end and the flying wire end are clamped and fixed between the two clamping blocks by bolts.

[0058] See also Figure 3, the rotating assembly 10 includes a connecting rod 10a and support rotating structures connected to both ends of the connecting rod 10a. Each support rotating structure includes two groups of support rods 10b and rotating rods 10c. One end of the rotating rod 10c is rotatably connected to the support rod 10b, and the other end of the rotating rod 10c is rotatably connected to the connecting rod 10a. A gap for accommodating the connecting rod 10a is provided between the two groups of support rods 10b and rotating rods 10c.

[0059] See Figure 4 , a card slot 10d is provided on the connecting rod 10a and a card block 10e for cooperatively closing the card slot 10d. The card slot 10d is used to accommodate a cable.

[0060] See Figure 3 and Figure 8 , a first elongated hole 10f is provided along the length direction of the rotating rod 10c. The rotating rod 10c is connected to the connecting rod 10a through a connecting member 10g. Among them, the connecting member 10g and the connecting rod 10a are rotatably connected through a bearing. At the same time, a connecting hole is provided on the outer side of the connecting member 10, so that a fastening bolt can cooperate with the first elongated hole 10f and the connecting hole to fix the connecting member 10 at a certain position on the first elongated hole 10f. The method of fixing the connecting member 10 by cooperating the fastening bolt with the first elongated hole 10f and the connecting hole is a common fixing method, which will not be elaborated in this application.

[0061] See Figure 1 , Figure 2 and Figure 5 , in the rotating assembly 10, the rotating rod 10c is driven to rotate by a driving assembly 40. The driving assembly 40 includes a transmission rod 40a, a first sprocket 40b, a first chain 40c, a motor 40d, and a second sprocket 40e. One end of the transmission rod 40a is fixed to the rotating rod 10c, and the rotating shaft of the rotating rod 10c is coaxial with the transmission rod 40a. The other end of the transmission rod 40a is fixed with the first sprocket 40b. The output shaft of the motor 40d is fixed with the second sprocket 40e. The transmission rod 40a and the first sprocket 40b are provided in two groups respectively corresponding to two rotating assemblies 10. The first chain 40c is simultaneously meshed and connected with the first sprocket 40b and the second sprocket 40e.

[0062] See Figure 5 , a support frame 40f is provided at the end of the transmission rod 40a where the first sprocket 40b is fixed, for supporting and connecting the transmission rod 40a. The transmission rod 40a and the support frame 40f are rotatably connected through a bearing or a bearing bracket.

[0063] See Figure 5 , Figure 6 and Figure 9, a tensioning assembly 41 is provided to compensate for the chain state of the holding chain, thereby avoiding the problem of unstable rotation caused by loosening and vibration during the meshing process. The tensioning assembly 41 includes a second chain 41a, a third sprocket 41b, a fourth sprocket 41c, and a bracket 41d. The fourth sprocket 41c is fixed on the transmission rod 40a. An adjustable mounting plate 41e is provided on the bracket 41d. The third sprocket 41b is mounted on the mounting plate 41e. The second chain 41a is simultaneously meshed with the third sprocket 41b and the fourth sprocket 41c. The third sprocket 41b is arranged inside the second chain 41a and only meshes with one side of the second chain 41a.

[0064] A second strip hole 41f is provided on the mounting plate 41e, and a mounting hole is provided on the bracket 41d, so as to facilitate fixing the mounting plate 41e at a certain position on the bracket 41d by using a fastening bolt to cooperate with the second strip hole 41f and the mounting hole.

[0065] See Figure 1 , Figure 5 and Figure 7 , a fixing plate 42a is provided at the top of the water tank 50a for placing the motor 40d to keep the motor 40d above the water surface. Two spaced fixing blocks 42b are provided on the fixing plate 42a. The gap between the fixing blocks 42b is larger than the motor 40d. At the same time, rotatable screws 42c are also provided on the fixing blocks 42b. When the screws 42c on both sides of the fixing blocks 42b are tightened and abutted against the base of the motor 40d, the motor 40d can be fixed.

[0066] See Figure 6 , a light-shielding sheet 43b is fixed at the end of the transmission rod 40a, and an optical detection sensor 43a is provided outside the light-shielding sheet 43b. The light-shielding sheet 43b is fixed on the support frame 40f.

[0067] In this embodiment, unless otherwise specified, "fixing" refers to a structure or method of keeping two separate components together by using common welding, bolt fastening, bonding and other methods in the prior art.

[0068] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them.

Claims

1. A flying line underwater oscillation simulation device, characterized in that: It includes two fixtures arranged in water and a rotating assembly located between the two fixtures, and two ends of the cable are fixed by the fixtures across the rotating assembly; The rotating assembly includes two supporting rotating structures and a connecting rod connected between the two supporting rotating structures, wherein the supporting rotating structure includes at least one group including a supporting rod and a rotating rod, one end of the rotating rod is rotatably connected to the supporting rod, and the other end of the rotating rod is rotatably connected to the connecting rod. The rotation of the rotating rod drives the connecting rod to swing, which generates a simulated underwater oscillation effect on the cable connected to the connecting rod.

2. The flying line underwater oscillation simulation device according to claim 1, characterized in that: The connecting rod is provided with a clamping slot and a clamping block closing the opening of the clamping slot, so that the cable is restricted between the clamping slot and the clamping block.

3. The flying line underwater oscillation simulation device according to claim 1, characterized in that: The distance between the rotation axis of the connecting rod and the rotation axis of the rotating rod is adjustable.

4. The flying line underwater oscillation simulation device according to claim 3, characterized in that: A strip hole one is arranged on the rotating rod along its length direction, and the connecting rod is connected with the rotating rod through the strip hole one.

5. The flying line underwater oscillation simulation device according to claim 1, characterized in that: It also includes a driving assembly, which includes at least one transmission rod connected to the rotating rod, and a motor that drives the transmission rod to rotate and then drives the rotating rod to rotate.

6. The flying line underwater oscillation simulation device according to claim 5, characterized in that: The motor drives the rotating rod to rotate through the cooperation of the sprocket wheel and the chain.

7. The flying line underwater oscillation simulation device according to claim 5, characterized in that: Two transmission rods are provided, and the motor drives the two transmission rods to rotate simultaneously through the cooperation of the sprocket and the chain.

8. The flying line underwater oscillation simulation device according to claim 7, characterized in that: It also includes a tensioning assembly, which includes a sprocket four fixed on two transmission rods, a chain two meshingly connected to the two sprocket fours, and a sprocket three arranged on the inner side of the chain two and kept meshingly connected to one side of the chain two. The sprocket three can move toward the outer side of the chain two to adjust the tension of the chain two.

9. The flying line underwater oscillation simulation device according to claim 8, characterized in that: The tensioning assembly also includes a bracket and a mounting plate which is adjustably mounted on the bracket, and the sprocket three is mounted on the mounting plate.

10. The flying line underwater oscillation simulation device according to claim 1, characterized in that: It also includes a fixing plate, on which two fixing blocks arranged at intervals are arranged, on which rotatable screws are arranged, and the motor is fixed by the tightened screws.

11. The flying line underwater oscillation simulation device according to claim 1, characterized in that: A shading sheet is fixed at the end of the transmission rod and rotates with the transmission rod. An optical detection sensor matched with the shading sheet is arranged on the outer side of the shading sheet.

12. The flying line underwater oscillation simulation device according to claim 1, characterized in that: Also included is a water tank, in which the holder and the rotating assembly are fixed; Ladders are fixed inside and outside the water tank; And / or a safety grating is fixed at the opening of the water tank.

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