Connection device for underwater cables

Abstract

The application relates to the technical field of electric power appliances, and provides a connecting device for underwater cables, which comprises a cable holding structure, a first locking structure for locking one end of the cable holding structure, and a second locking structure for locking the other end of the cable holding structure. The cable holding structure comprises a cable connecting piece installed on a cable, and a cable extruding piece for sleeving the cable connecting piece and providing pre-tightening force for the cable connecting piece. One end of the cable extruding piece is connected with the first locking structure, and the end of the cable connecting piece, which is away from the first locking structure, extends out of the cable extruding piece and is connected with the second locking structure. According to the technical scheme of the application, the cable connecting piece can hold the underwater cable by embedding the cable connecting piece in the cable extruding piece and applying pressure to the cable connecting piece, so that the connecting strength is ensured, and the connecting device for underwater cables is prevented from being dislocated and loosened on the underwater cable due to tension.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric power tools, in particular to a connecting device for underwater cable. BACKGROUND

[0002] The connection between the buoy marker and the underwater anchor chain is usually achieved by the contact connection of the metal swivel with the anchor chain. Since the materials are the same, the metal characteristics are almost the same, and the wear is considerable. Such an anchor chain only plays a fixing role. If the "anchor chain" that fixes the marker can play a communication role, armored cable needs to be used to replace the anchor chain. The connection between the armored cable and the buoy marker is a thorny problem. The armored cable cannot be directly connected with the marker, but can only be connected through the cable clamping device. In the prior art, the U-shaped buckle is most commonly used to clamp the cable, and the U-shaped buckle is connected with the target member through a metal member to form a clamping and dragging structure of the cable. Another similar product is called a cable clamp, which has a similar effect but different application environment and usage, and is limited in application. In the prior art, the U-shaped buckle can achieve the effect of dragging, but has obvious shortcomings: the contact surface between the U-shaped buckle and the cable is small, and the pressure on the unit area is large, which can easily cause local extrusion of the cable, resulting in damage to the outer skin and internal conductor of the cable. Secondly, the U-shaped buckle needs to be connected with the target member through other metal members to achieve the purpose of dragging, and the entire dragging structure has a function but is scattered, which is not suitable for use as a product. When the cable clamp is used in the prior art, it is only suitable for temporary dragging and pulling operation, and the cable clamp will loosen when the dragging force disappears, which is not suitable for clamping and dragging the cable for long-term use. SUMMARY

[0003] The present application aims to solve at least one of the technical problems in the background art, and provides a connecting device for underwater cable.

[0004] To achieve the above-mentioned purpose, the present application provides a connecting device for underwater cable, comprising: a cable clamping structure, a first locking structure for locking one end of the cable clamping structure, and a second locking structure for locking the other end of the cable clamping structure, the cable clamping structure comprising a cable connecting member mounted on the cable, and a cable extrusion member sleeved with the cable connecting member and providing a pre-tightening force for the cable connecting member, one end of the cable extrusion member being connected with the first locking structure, and the end of the cable connecting member away from the first locking structure extending out of the cable extrusion member and being connected with the second locking structure.

[0005] According to one aspect of the present application, the cable connecting member comprises a tapered connecting body with a through hole, and a connecting end connected with the tapered connecting body and the second locking structure.

[0006] The cable extrusion has a tapered through hole matched with the outer contour of the tapered connector.

[0007] According to an aspect of the present application, the tapered connector comprises a first arc-shaped body, a second arc-shaped body symmetrically arranged with the first arc-shaped body, and a limiting body.

[0008] The limiting body is connected to the end of the first arc-shaped body and the second arc-shaped body away from the second locking structure, and can form a gap between the first arc-shaped body and the second arc-shaped body.

[0009] According to an aspect of the present application, the end of the first arc-shaped body and the second arc-shaped body away from the second locking structure is respectively provided with a first groove and a second groove, the first groove and the second groove are correspondingly arranged, and the first groove and the second groove are used for mounting the limiting body.

[0010] When the limiting body is mounted in the first groove and the second groove, the first arc-shaped body and the second arc-shaped body have the gap therebetween.

[0011] According to an aspect of the present application, a limiting groove is arranged on the sidewall of the first groove and the second groove, and a limiting protrusion adapted to the limiting groove is arranged on the limiting body.

[0012] According to an aspect of the present application, the limiting protrusion is a rectangular body, the limiting groove has a limiting stop portion matched with the limiting protrusion in shape and a semicircular buffer portion connected with the limiting stop portion, and the diameter of the buffer portion is equal to the width of the limiting stop portion.

[0013] According to an aspect of the present application, the first groove and the second groove are arc-shaped grooves, the limiting body is an annular body, the groove width of the first groove and the second groove is greater than the wall width of the limiting body, and when the limiting body abuts against the sidewall of the first groove and the second groove close to the through hole, the limiting protrusion is clamped with the limiting stop portion.

[0014] According to an aspect of the present application, the tapered through hole is provided with a sealing and fixing structure layer close to the side of the first locking structure, which is used for sealing and fixing the tapered connector mounted in the tapered through hole.

[0015] According to an aspect of the present application, the first locking structure comprises a connecting base abutting against the end of the cable extrusion, and a locking nut sleeved on the connecting base and the outside of the cable extrusion, and connected with the thread arranged on the outer wall of the cable extrusion.

[0016] According to one aspect of the present application, the cable connector extending from one end of the cable extruding member is provided with a thread, and the second locking structure is a pre-tightening nut matched with the thread.

[0017] According to one aspect of the present application, the cable is gripped by the cable gripping structure in a surrounding manner, which can increase the contact area with the outer wall of the cable and reduce stress concentration, thereby reducing damage to the cable. In particular, when the underwater cable connecting device of the present application is used to drag a heavy object underwater to maintain the underwater position of the cable, the underwater cable can be prevented from being cut off from the connection due to the large gravity of the dragged heavy object. Further, after the cable gripping structure is installed on the cable, the cable gripping structure can be pre-tightened by the cable extruding member from the periphery of the cable gripping structure, which can increase the connection strength between the underwater cable connecting device of the present application and the underwater cable, and increase the gripping force. After gripping, the first locking structure and the second locking structure are locked and fixed, which can effectively prevent the underwater cable connecting device of the present application from slipping along the underwater cable when working in underwater environment.

[0018] According to one aspect of the present application, the tapered connecting body is installed on the underwater cable through the through hole, the diameter of the through hole is slightly smaller than the outer diameter of the underwater cable, and the through hole is connected with the underwater cable in an interference fit, which can make the tapered connecting body grip the underwater cable, and then the cable extruding member is sleeved on the periphery of the tapered connecting body and connected with the tapered connecting body through the tapered through hole. In this way, when the underwater cable connecting device of the present application is connected with a heavy object to drag the underwater cable, the heavy object is connected with the first locking structure, i.e. the cable extruding member is dragged in the direction from the small opening to the large opening of the tapered through hole, and the tapered through hole further extrudes the tapered connecting body on the basis of the original pre-tightening, thereby making the underwater cable connecting device of the present application grip the underwater cable more tightly and connect more firmly. Of course, on the basis of this, a gap can be provided on the outer wall of the tapered connecting body, which can make the above-mentioned effect more obvious and effective.

[0019] According to one of the schemes of the present application, the taper-shaped connector comprises a first arc-shaped body, a second arc-shaped body symmetrically arranged with the first arc-shaped body, and a limiting body connecting the end of the first arc-shaped body and the second arc-shaped body away from the second locking structure to form a gap between the first arc-shaped body and the second arc-shaped body. In this way, the underwater cable can be clamped from both sides by the first arc-shaped body and the second arc-shaped body, and the gap between the first arc-shaped body and the second arc-shaped body can be formed when the first arc-shaped body and the second arc-shaped body clamp the underwater cable, which can provide a space for further relative movement between the first arc-shaped body and the second arc-shaped body, i.e., when the weight drags and the first arc-shaped body and the second arc-shaped body are further pressed by the cable pressing piece, the two can move relatively through the above-mentioned gap, which can further clamp the underwater cable and ensure the connection strength.

[0020] According to one of the schemes of the present application, the end of the first arc-shaped body and the second arc-shaped body away from the second locking structure is respectively provided with a first groove and a second groove corresponding to each other and used for mounting the limiting body. When the limiting body is mounted in the first groove and the second groove, the gap between the first arc-shaped body and the second arc-shaped body is formed. In this way, the recess is arranged at the end of the taper-shaped connector, and the limiting is realized by embedding the limiting body in the recess, which can ensure that the limiting body does not protrude from the end of the taper-shaped connector, and the overall structure arrangement and space arrangement are more optimized, the overall rigidity is better, and the volume is smaller.

[0021] According to one of the schemes of the present application, the side wall of the first groove and the second groove is provided with a limiting slot, and the limiting body is provided with a limiting protrusion connected with the limiting slot. In this way, when the limiting body is mounted in the first groove and the second groove to limit and mount the first arc-shaped body and the second arc-shaped body, the limiting protrusion can be mounted in the limiting slot, and the cooperation between the limiting protrusion and the limiting slot can limit the first arc-shaped body and the second arc-shaped body in the circumferential direction, so that the installation is more convenient and fast.

[0022] According to one of the schemes of the present application, the limiting protrusion is a rectangular body, the limiting slot has a limiting stop portion matched with the limiting protrusion and a semicircular buffer portion connected with the limiting stop portion, and the diameter of the buffer portion is equal to the width of the limiting stop portion. In this way, the limiting protrusion can be fixed and clamped when it is inserted into the limiting stop portion, and when the first arc-shaped body and the second arc-shaped body are pressed, the limiting protrusion can be pressed towards the buffer portion to realize interference connection, so that the structure connection is more stable and the strength is higher.

[0023] According to one scheme of the present application, the first groove and the second groove are arc-shaped grooves, the limiting body is an annular body, the groove width of the first groove and the second groove is greater than the wall width of the limiting body, and when the limiting body abuts against the side wall of the first groove and the second groove close to the through hole, the limiting protrusion is clamped by the limiting clamping part. In this way, the limiting body can limit the first arc-shaped body and the second arc-shaped body by tightly embracing the side wall of the first groove and the second groove close to the through hole, and then the first arc-shaped body and the second arc-shaped body are pressed in the direction away from the through hole by the clamping of the limiting protrusion and the limiting clamping part, so that the first arc-shaped body and the second arc-shaped body can be tightly pressed while being limited by the limiting body, ensuring the accurate installation position of each component and the strength of the installation structure. Moreover, because the groove width of the first groove and the second groove is greater than the wall width of the limiting body, when the limiting body abuts against the side wall and the limiting protrusion is clamped by the limiting clamping part, there is still a gap between the side wall of the first groove and the second groove away from the through hole and the limiting body, so that when the first arc-shaped body and the second arc-shaped body are pressed, the limiting body and the limiting protrusion thereon have a movable space, so that the underwater cable can be clamped more tightly under the action of an external force.

[0024] According to one scheme of the present application, the side of the conical through hole close to the first locking structure is provided with a sealing and fixing structure layer for sealing and fixing the conical connecting body installed in the conical through hole. In the embodiment, the sealing and fixing structure layer is an epoxy resin glue layer, so that after the installation of the cable connecting piece and the cable pressing piece, a large space is left in the inside of the cable pressing piece, and the epoxy resin glue can be filled to achieve the sealing and the increase of the anti-drag strength.

[0025] According to the scheme of the present application, the underwater cable connecting device is formed by the nesting of two conical structures (the conical connecting body and the conical through hole), and the structure is tightened more and more, so that the axial drag force is converted into radial pressing. The greater the drag force, the greater the pressing. The underwater cable connecting device is reasonably designed for long-term use. Moreover, the underwater cable connecting device has the functions of self-tightening, firmness and reliability. The cable is not damaged, and the tensile strength of the cable itself is indirectly ensured. The installation is simple and easy to understand, and one person can complete the installation with two wrenches. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 Schematic representation of a front view of an underwater cable connecting device according to one embodiment of the present application;

[0027] Figure 2 Schematic representation of an exploded view of an underwater cable connecting device according to one embodiment of the present application;

[0028] Figure 3Fig. 1 is a perspective view of a connection device for an underwater cable according to an embodiment of the present application. Figure 2 Fig. 2 is an enlarged view of a portion of Fig. 1. DETAILED DESCRIPTION

[0029] The present application will now be discussed with reference to exemplary embodiments. It should be understood that the embodiments discussed are only to better enable those of ordinary skill in the art to better understand and thus implement the present application, and are not intended to limit the scope of the present application in any way.

[0030] As used herein, the term "includes" and its variants are to be read as open-ended terms that mean "includes, but is not limited to." The term "based on" is to be construed as "based at least in part on." The terms "one embodiment" and "an embodiment" are to be read as "at least one embodiment."

[0031] Figure 1 Fig. 1 is a perspective view of a connection device for an underwater cable according to an embodiment of the present application. Figure 2 Fig. 2 is an enlarged view of a portion of Fig. 1. Figure 1 Fig. 3 is a sectional view taken along line III-III of Fig. 1. Figure 2 As shown in Figs. 1-3, in the present embodiment, the connection device for an underwater cable includes a cable gripping structure 1, a first locking structure 2 that locks one end (the upper end in the figures) of the cable gripping structure 1, and a second locking structure 3 that locks the other end (the lower end in the figures) of the cable gripping structure 1. The cable gripping structure 1 includes a cable connector 101 that is mounted on the cable, and a cable pressing member 102 that is fitted over the cable connector 101 and provides a pre-tightening force to the cable connector 101. One end of the cable pressing member 102 is connected to the first locking structure 2, and the end of the cable connector 101 that is distal from the first locking structure 2 extends out of the cable pressing member 102 and is connected to the second locking structure 3. In this way, the cable gripping structure 1 can grip the cable in a manner that surrounds the cable, which increases the contact area with the outer wall of the cable and reduces stress concentration, thereby reducing damage to the cable. In particular, when the connection device for an underwater cable according to the present application is used to drag a heavy object underwater to maintain the position of the underwater cable, the connection device can prevent the underwater cable from being severed at the connection point due to the large weight of the heavy object being dragged. Furthermore, after the cable gripping structure 1 is mounted on the cable, the cable pressing member 102 can apply a pre-tightening force to the cable gripping structure 1 from the periphery of the cable gripping structure 1, which increases the connection strength between the connection device for an underwater cable according to the present application and the underwater cable, and increases the gripping force. After the cable gripping structure 1 is gripped, the first locking structure 2 and the second locking structure 3 lock and secure the cable gripping structure 1, which effectively prevents the connection device for an underwater cable according to the present application from slipping along the underwater cable when it is used in an underwater environment. It should be noted that when the connection device for an underwater cable according to the present application is used in an underwater environment, water can interfere with the connection point and make the surface of the object slippery, so if the connection is not secure enough, there is a risk of slipping and falling at any time.

[0032] Furthermore, such as Figure 2 As shown, in this embodiment, the cable connector 101 includes a tapered connector 1011 with a through hole 4 and a connecting end 1012 connected to the tapered connector 1011 and the second locking structure 3. The cable extruder 102 has a tapered through hole 1021 that matches the outer contour of the tapered connector 1011. According to one embodiment of the present invention, a tapered connector 1011 is installed on an underwater cable through a through hole 4. The diameter of the through hole 4 is slightly smaller than the outer diameter of the underwater cable. The through hole 4 and the underwater cable are connected by an interference fit, which allows the tapered connector 1011 to hold tightly on the underwater cable. Then, a cable compression member 102 is sleeved on the periphery of the tapered connector 1011 and connected to the tapered connector 1011 through a tapered through hole 1021. In this way, when the underwater cable connecting device of the present invention is connected to a heavy object to drag the underwater cable, the heavy object connects to the first locking structure 2, that is, drags the cable compression member 102 along the direction from the small opening to the large opening of the tapered through hole 1021. The tapered through hole 1021 will further compress the tapered connector 1011 on the basis of the original pre-tightening, thereby making the underwater cable connecting device of the present invention hold the underwater cable more tightly and the connection more reliable. Of course, on this basis, a gap can also be provided on the outer wall of the tapered connector 1011 that runs through both ends, so that the above effect can be more obvious and effective.

[0033] Furthermore, Figure 3 for Figure 2 A magnified view of a portion, such as Figure 2 and Figure 3 As shown, in this embodiment, the conical connector 1011 includes a first arc-shaped body 10111, a second arc-shaped body 10112 symmetrically arranged with the first arc-shaped body 10111, and a limiting body 10113 that connects the end of the first arc-shaped body 10111 and the second arc-shaped body 10112 away from the second locking structure 3 (i.e., the upper end in the figure) to form a gap between the first arc-shaped body 10111 and the second arc-shaped body 10112. With this configuration, the underwater cable can be clamped from both sides by the first arc-shaped body 10111 and the second arc-shaped body 10112. The limiting body 10113 ensures that there is still a gap between the first arc-shaped body 10111 and the second arc-shaped body 10112 when clamping the underwater cable. This gap allows for further relative movement between the first arc-shaped body 10111 and the second arc-shaped body 10112. That is, when a heavy object is dragged, the cable clamping member 102 applies further pressure to the first arc-shaped body 10111 and the second arc-shaped body 10112, and the two can move relative to each other through the gap. This further clamps the underwater cable and ensures the connection strength.

[0034] Further, as shown in Figure 3 In the present embodiment, the first arc-shaped body 10111 and the second arc-shaped body 10112 are respectively provided with a first groove 10114 and a second groove 10115 corresponding to each other and used for mounting the limiting body 10113 at the end (upper end in the figure) of the second locking structure 3. In the present embodiment, when the limiting body 10113 is mounted in the first groove 10114 and the second groove 10115, the first arc-shaped body 10111 and the second arc-shaped body 10112 have the above-mentioned gap therebetween. In this way, by providing the grooves at the end of the tapered connecting body 1011, the limiting is achieved by embedding the limiting body 10113 in the grooves, so that the limiting body 10113 does not protrude from the end of the tapered connecting body 1011, the overall structural arrangement and space arrangement are more optimized, the overall rigidity is better, and the volume is smaller.

[0035] Further, as shown in Figure 3 In the present embodiment, the side walls of the first groove 10114 and the second groove 10115 are provided with a limiting slot 10116, and the limiting body 10113 is provided with a limiting protrusion 10117 connected with the limiting slot 10116. In this way, when the limiting body 10113 is mounted in the first groove 10114 and the second groove 10115 to limit and mount the first arc-shaped body 10111 and the second arc-shaped body 10112, the limiting protrusion 10117 can be mounted in the limiting slot 10116, and the cooperation between the limiting protrusion 10117 and the limiting slot 10116 can limit the first arc-shaped body 10111 and the second arc-shaped body 10112 in the circumferential direction, so that the installation is more convenient and fast.

[0036] Further, as shown in Figure 3 In the present embodiment, the limiting protrusion 10117 is a rectangular body, the limiting slot 10116 has a limiting clamping portion 10118 matched with the limiting protrusion 10117 and a semicircular buffer portion 10119 connected with the limiting clamping portion 10118, and the diameter of the buffer portion 10119 is equal to the width of the limiting clamping portion 10118. In this way, when the limiting protrusion 10117 is inserted into the limiting clamping portion 10118, it can be fixed and clamped, and when the first arc-shaped body 10111 and the second arc-shaped body 10112 are pressed, the limiting protrusion 10117 can be pressed towards the buffer portion 10119 to achieve interference connection, so that the structural connection is more stable and the strength is higher.

[0037] Further, as shown in Figure 3As shown, in the present embodiment, the first groove 10114 and the second groove 10115 are arc-shaped grooves, the limiting body 10113 is a ring-shaped body, the groove width of the first groove 10114 and the second groove 10115 is greater than the wall width of the limiting body 10113, and when the limiting body 10113 abuts against the side wall of the first groove 10114 and the second groove 10115 close to the through hole, the limiting protrusion 10117 is clamped by the limiting clamping portion 10118. In this way, the limiting body 10113 can limit the first arc-shaped body 10111 and the second arc-shaped body 10112 by tightly embracing the side wall of the first groove 10114 and the second groove 10115 close to the through hole, and then the first arc-shaped body 10111 and the second arc-shaped body 10112 are pressed in the direction away from the through hole by the clamping of the limiting protrusion 10117 and the limiting clamping portion 10118, so that the first arc-shaped body 10111 and the second arc-shaped body 10112 can be tightly pressed while being limited by the limiting body 10113, ensuring the accurate installation position of each component and the strength of the installation structure. Moreover, because the groove width of the first groove 10114 and the second groove 10115 is greater than the wall width of the limiting body 10113, when the limiting body 10113 abuts against the side wall and the limiting protrusion 10117 is clamped by the limiting clamping portion 10118, there is still a gap between the side wall of the first groove 10114 and the second groove 10115 away from the through hole and the limiting body 10113, so that when the first arc-shaped body 10111 and the second arc-shaped body 10112 are pressed, the limiting body 10113 and the limiting protrusion 10117 thereon have a movable space, so that the underwater cable can be clamped more tightly under the action of external force.

[0038] Further, as shown in FIG. 1, the cable connector 101 and the cable pressing member 102 are connected by a tapered connecting body 1011, and the tapered connecting body 1011 is connected to the cable connector 101 through a tapered through hole 1021 in the cable pressing member 102. Figure 1 As shown, in the present embodiment, the tapered through hole 1021 close to one side (the upper side in the figure) of the first locking structure 2 is provided with a sealing and fixing structure layer 10211 for sealing and fixing the tapered connecting body 1011 installed in the tapered through hole 1021. In the present embodiment, the sealing and fixing structure layer 10211 is an epoxy resin glue layer, which can leave a larger space in the inside of the cable pressing member 102 after the installation of the cable connector 101 and the cable pressing member 102, and can achieve the effect of sealing and increasing the strength of resistance to dragging by pouring epoxy resin glue.

[0039] Further, as shown in FIG. 1, the cable connector 101 and the cable pressing member 102 are connected by a tapered connecting body 1011, and the tapered connecting body 1011 is connected to the cable connector 101 through a tapered through hole 1021 in the cable pressing member 102. Figure 1 and Figure 2As shown, in the embodiment, the first locking structure 2 comprises a connecting base 201 abutting against the end of the cable extrusion 102, and a locking nut 202 sleeved outside the connecting base 201 and the cable extrusion 102 and threaded with the outer wall of the cable extrusion 102. The end of the cable connector 101 extending out of the cable extrusion 102 is threaded, and the second locking structure 3 is a pre-tightening nut matched with the thread. In this way, the two ends can be locked by the locking nut 202 and the pre-tightening nut, ensuring that the above structure will not shift and loosen, and ensuring the structural strength.

[0040] According to the above scheme of the present application, the nesting of the two taper structures (the taper connecting body 1011 and the taper through hole 1021) forms a tighter and tighter structure, converting the axial drag force into radial extrusion. The greater the drag force, the greater the extrusion. The structure design is reasonably utilized to realize the long-term use of the underwater cable connecting device. Moreover, the underwater cable connecting device of the present application is firm and reliable, has a self-tightening function, has zero damage to the clamped cable, and indirectly ensures the tensile strength of the cable itself. The installation is simple and easy to understand, and one person can operate it with only two wrenches.

[0041] Finally, it should be pointed out that the above preferred embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present application.

Claims

1. A connection device for underwater cables, characterized in that The cable gripping structure (1), the first locking structure (2) locking one end of the cable gripping structure (1), and the second locking structure (3) locking the other end of the cable gripping structure (1), the cable gripping structure (1) comprising a cable connecting piece (101) mounted on the cable, a cable extruding piece (102) sleeving the cable connecting piece (101) and providing a pre-tightening force for the cable connecting piece (101), one end of the cable extruding piece (102) being connected with the first locking structure (2), and the end of the cable connecting piece (101) away from the first locking structure (2) extending out of the cable extruding piece (102) and being connected with the second locking structure (3); The cable connecting piece (101) comprises a tapered connecting body (1011) with a through hole, and a connecting end (1012) connected with the tapered connecting body (1011) and the second locking structure (3); The cable extruding piece (102) has a tapered through hole (1021) matched with the outer contour of the tapered connecting body (1011); The tapered connecting body (1011) comprises a first arc-shaped body (10111), a second arc-shaped body (10112) symmetrically arranged with the first arc-shaped body (10111), and a limiting body (10113); The limiting body (10113) is connected to the ends of the first arc-shaped body (10111) and the second arc-shaped body (10112) away from the second locking structure (3), and the limiting body (10113) can form a gap between the first arc-shaped body (10111) and the second arc-shaped body (10112); The ends of the first arc-shaped body (10111) and the second arc-shaped body (10112) away from the second locking structure (3) are respectively provided with a first groove (10114) and a second groove (10115), the first groove (10114) and the second groove (10115) are correspondingly arranged, and the first groove (10114) and the second groove (10115) are used for mounting the limiting body (10113); When the limiting body (10113) is mounted in the first groove (10114) and the second groove (10115), the first arc-shaped body (10111) and the second arc-shaped body (10112) have the gap therebetween; The side wall of the first groove (10114) and the second groove (10115) is provided with a limiting groove (10116), and the limiting body (10113) is provided with a limiting protrusion (10117) matched with the limiting groove (10116). The limiting protrusion (10117) is a rectangular body, the limiting groove (10116) has a limiting stop portion (10118) matched with the limiting protrusion (10117) in shape and a semicircular buffer portion (10119) connected with the limiting stop portion (10118), and the diameter of the buffer portion (10119) is equal to the width of the limiting stop portion (10118).

2. The connecting device for underwater cables according to claim 1, characterized in that ​ 3. The connecting device for underwater cables according to claim 2, characterized in that The first groove (10114) and the second groove (10115) are arc-shaped grooves, the limiting body (10113) is an annular body, the groove width of the first groove (10114) and the second groove (10115) is greater than the wall width of the limiting body (10113), and when the limiting body (10113) abuts against the side wall of the first groove (10114) and the second groove (10115) close to the through hole, the limiting protrusion (10117) and the limiting clamping portion (10118) are clamped.

4. The connecting device for an underwater cable according to claim 1, characterized by The conical through hole (1021) is provided with a sealing and fixing structure layer (10211) close to one side of the first locking structure (2) for sealing and fixing the conical connecting body (1011) installed in the conical through hole (1021).

5. The connecting device for underwater cables according to any of claims 1-4, characterized in that, The first locking structure (2) comprises a connecting base (201) abutting against the end of the cable extrusion piece (102), and a locking nut (202) sleeved outside the connecting base (201) and the cable extrusion piece (102) and connected with the threads provided on the outer wall of the cable extrusion piece (102).

6. The connecting device for underwater cables according to any of claims 1-4, characterized in that, The end of the cable connecting piece (101) protruding from the cable extrusion piece (102) is provided with threads, and the second locking structure (3) is a pre-tightening nut matched with the threads.

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