External-force-resistant pressure-resistant flame-retardant cable protection sleeve

Abstract

The invention relates to the technical field of submarine cable protection, in particular to an external-force-resistant pressure-resistant flame-retardant cable protection sleeve. Comprising a counterweight sleeve and a cable trough extending towards the center from the outer wall of the counterweight sleeve; the number of the counterweight sleeves is multiple. Aligned connecting grooves are formed in the faces, close to each other, of every two adjacent balance weight sleeves. The adjacent connecting grooves are staggered in the circumferential direction of the counterweight sleeve; the adjacent counterweight sleeves are connected through a connecting piece; the ends of the connecting pieces are connected into the corresponding connecting grooves in a sliding mode. The end part of the connecting piece is connected with the groove bottom of the corresponding connecting groove through an anti-falling rope; the counterweight sleeve is in an unfolded state, so that the counterweight force of the counterweight sleeve on the cable is dispersed, concentrated counterweight is avoided, the counterweight area of the grounding section of the cable is increased by the dispersed counterweight, and when the cable is impacted by ocean current, the stability of the cable is improved through the chain-shaped counterweight, concentrated bending is avoided, and the protection of the cable is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of submarine cable protection, in particular to an external force resistant and pressure resistant flame retardant cable protective sleeve. Background Art

[0002] Submarine cables are made of pressure-resistant insulating flame-retardant materials and then laid on the seabed. They are important facilities for telecommunication transmission and power transmission. They are widely used in long-distance communications, such as connecting distant islands, ensuring communications of military facilities across the sea, and power transmission between islands and across rivers and harbors. Due to the complex and changeable seabed environment, cables face multiple threats such as seawater pressure, current impact, and potential fires.

[0003] The portion of the submarine cable that contacts the seabed is called the bottoming section; in order to ensure the lateral and vertical stability of the submarine cable bottoming section on the seabed, it is necessary to add counterweights to the bottoming section of the cable. The existing method of adding counterweights to the bottoming section of the cable is to install the weights at designated positions on the bottoming section. The counterweights of the cable bottoming section are concentrated in one place. When the cable is impacted by ocean currents, the cable will generate a large bending load based on the position of the counterweight, which is not conducive to the protection of the cable. Summary of the invention

[0004] In order to make up for the shortcomings of the prior art, the present invention proposes an external force resistant and pressure resistant flame retardant cable protective sleeve. Since the counterweight sleeve is in an expanded state, the counterweight force of the counterweight sleeve on the cable can be dispersed to avoid concentrated counterweight. The dispersed counterweight increases the counterweight area of ​​the cable bottoming section. When the cable is impacted by ocean currents, the cable increases stability through the chain-shaped counterweight to avoid concentrated bending, which is beneficial to the protection of the cable.

[0005] The technical solution adopted by the present invention to solve its technical problems is: the external force resistant and pressure resistant flame retardant cable protective sleeve described in the present invention comprises a counterweight sleeve and a cable trough extending toward the center of the outer wall of the counterweight sleeve; the number of the counterweight sleeves is multiple; two adjacent counterweight sleeves are provided with aligned connecting grooves on one side close to each other; adjacent connecting grooves are staggered in the circumferential direction of the counterweight sleeve; adjacent counterweight sleeves are connected by connecting pieces; the ends of the connecting pieces are slidably connected in the corresponding connecting grooves; the ends of the connecting pieces are connected to the bottoms of the corresponding connecting grooves through anti-slip ropes; the cable trough walls are provided with locking grooves; a locking block is slidably connected in the locking grooves; the locking block can limit the cable inside the cable trough; multiple counterweight sleeves can be folded close to each other and unfolded away from each other.

[0006] Preferably, a driving groove is provided inside the counterweight sleeve located in the middle position; a driving plate is slidably and sealingly connected inside the driving groove; one side of the driving plate facing away from the cable groove is fixedly connected with a driving rod; one end of the driving rod away from the driving plate extends through the counterweight sleeve to the outside and is fixedly connected with a driving ring; the driving plate divides the internal space of the driving groove into a rod chamber and a rodless chamber; the rodless chamber is communicated with the outside of the counterweight sleeve through a first one-way air inlet hole, and the first one-way air inlet hole is arranged inside the driving rod; the rodless chamber is communicated with the bottom of the connection groove inside the same counterweight sleeve through a first one-way air outlet hole; the connection groove is slidably and sealingly connected with the connecting piece; the locking groove is slidably and sealingly connected with the locking block; the bottom of the locking groove is communicated with the bottom of the connection groove inside the same counterweight sleeve; two connection grooves inside adjacent two counterweight sleeves are communicated through a connection hole; the connection hole is arranged inside the connecting piece; a clamping groove is arranged on the wall of the cable groove; a clamping block is slidably and sealingly connected inside the clamping groove; the bottom of the clamping groove is communicated with the bottom of the connection groove inside the same counterweight sleeve.

[0007] Preferably, a pressure relief groove is provided on the outer wall of the counterweight sleeve; a pressure relief block is slidably and sealingly connected inside the pressure relief groove; the pressure relief block is connected with the bottom of the pressure relief groove through a first tension spring, and the bottom of the pressure relief groove is communicated with the outside air; a first pressure relief hole communicated with the bottom of the locking groove is provided on the outer wall of the counterweight sleeve; the first pressure relief hole penetrates through the pressure relief groove; a second pressure relief hole is penetrated through the pressure relief block; the pressure relief block can drive the second pressure relief hole to be staggered or communicated with the first pressure relief hole; the connecting piece is connected with the bottom of the connection groove through a second tension spring; the locking block is connected with the bottom of the locking groove through a third tension spring; the clamping block is connected with the bottom of the clamping groove through a fourth tension spring.

[0008] Preferably, a strengthening groove aligned with the locking groove is provided on the wall of the cable groove; one end of the locking block away from the bottom of the locking groove can be clamped into the strengthening groove.

[0009] Preferably, the driving rod is slidably and sealingly connected with the counterweight sleeve; the rod chamber is communicated with the outside of the counterweight sleeve through a second one-way air inlet hole; the rod chamber is communicated with the bottom of the connection groove inside the same counterweight sleeve through a second one-way air outlet hole.

[0010] Preferably, the pulling force of the third tension spring is less than the pulling force of the fourth tension spring; the pulling force of the fourth tension spring is less than the pulling force of the second tension spring.

[0011] Preferably, the connecting piece is composed of a connecting block and connecting strips; the number of the connecting block and the connecting strips is two; a rotating groove is provided at the end of one of the connecting strips; a rotating block is rotatably and sealingly connected inside the rotating groove; the rotating block is fixedly connected with the end of the other connecting strip; one ends of the two connecting strips close to each other are rotatably connected through the rotating block and the rotating groove, and the other ends of the two connecting strips far from each other are fixedly connected with the connecting block; the connecting block is slidably and sealingly connected inside the corresponding connection groove and is connected with the second tension spring.

[0012] Preferably, the rotating block is connected to the inner wall of the rotating groove through a torsion spring; the lengths of the two connecting bars are kept consistent under the torsion of the torsion spring.

[0013] Preferably, one of the connecting blocks in the connecting member is movably and sealingly connected in a connecting groove with a corrugated inner wall; the wave crests and wave troughs of the connecting groove with a corrugated inner wall correspond to each other.

[0014] The beneficial effects of the present invention are as follows: 1. Since the counterweight sleeve of the present invention is in an unfolded state, the counterweight force of the counterweight sleeve on the cable is dispersed, avoiding concentrated counterweight. The dispersed counterweight increases the counterweight area of the bottom-touching section of the cable. When the cable is impacted by ocean currents, the cable increases its stability through the chain-shaped counterweight, avoiding concentrated bending, which is beneficial to the protection of the cable.

[0015] 2. By controlling the driving rod to drive the driving plate to slide back and forth in the driving groove, the present invention enables multiple counterweight sleeves to change from the folded state to the unfolded state, and the multiple counterweight sleeves can be self-locked on the outer wall of the cable. Compared with the original method of manually separating multiple counterweight sleeves in sequence, the loading and unloading of the protective sleeve are greatly facilitated.

[0016] 3. The lock block and the clamping block of the present invention work first before the multiple counterweight sleeves move away from each other and unfold, so that the multiple counterweight sleeves on the cable are first installed and clamped before unfolding, avoiding the situation that the counterweight sleeves fall off the outer wall of the cable during the unfolding process, and making the installation of the protective sleeve on the cable smoother. Description of the Drawings

[0017] The present invention will be further described below in conjunction with the drawings and embodiments.

[0018] Figure 1 is the three-dimensional view of the present invention after folding; Figure 2 is the three-dimensional view of the present invention after unfolding; Figure 3 is Figure 2 the enlarged view of part A in Figure 4 is Figure 3 the three-dimensional view from another angle; Figure 5 is the three-dimensional view of a single counterweight sleeve in the present invention; Figure 6 is the cross-sectional view of the counterweight sleeve at the middle position of the present invention; Figure 7 is the position view of the connecting groove with a corrugated inner wall in the present invention; Figure 8 is the connection schematic diagram of adjacent counterweight sleeves in the present invention; Figure 9 is the three-dimensional view of the connecting member in the present invention; Figure 10 It is a cross-sectional view of the connecting member in the present invention.

[0019] In the figure: counterweight sleeve 1, cable groove 11, reinforcing groove 111, connecting groove 12, locking groove 13, locking block 14, third tension spring 141, driving groove 15, rod chamber 151, rodless chamber 152, first one-way air inlet hole 153, first one-way air outlet hole 154, second one-way air inlet hole 155, second one-way air outlet hole 156, connecting hole 16, clamping groove 17, pressure relief groove 18, first pressure relief hole 19, connecting member 2, anti-detachment rope 21, second tension spring 22, connecting block 23, connecting strip 24, rotating groove 241, rotating block 242, torsion spring 25, driving plate 3, driving rod 31, driving ring 32, clamping block 4, fourth tension spring 41, pressure relief block 5, first tension spring 51, second pressure relief hole 52. Specific Embodiments

[0020] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0021] As Figures 1 to 10 shown, the present invention includes the following embodiments: Embodiment 1: An anti-external force and pressure-resistant flame-retardant cable protective sleeve, including a counterweight sleeve 1 and a cable groove 11 extending towards the center on the outer wall of the counterweight sleeve 1; the number of the counterweight sleeves 1 is multiple; on the mutually approaching surfaces of two adjacent counterweight sleeves 1, aligned connecting grooves 12 are provided; adjacent connecting grooves 12 are staggeredly arranged in the circumferential direction of the counterweight sleeve 1; adjacent counterweight sleeves 1 are connected by a connecting member 2; the end of the connecting member 2 is slidably connected in the corresponding connecting groove 12; the end of the connecting member 2 is connected to the bottom of the corresponding connecting groove 12 by an anti-detachment rope 21; a locking groove 13 is provided on the groove wall of the cable groove 11; a locking block 14 is slidably connected in the locking groove 13; the locking block 14 can limit the cable inside the cable groove 11; multiple counterweight sleeves 1 can approach and fold each other and spread away from each other.

[0022] Before the cable needs to be weighted, move the weighted sleeve 1 in the folded state to the position where the cable needs to be weighted. Subsequently, align the opening of the cable groove 11 on the weighted sleeve 1 with the position where the cable needs to be weighted. Then, after the cable is inserted into the cable groove 11, control the locking block 14 on the groove wall of the cable groove 11 to move out of the locking groove 13, so that the cable is restricted within the cable groove 11, thus preventing the cable from moving out of the cable groove 11. Subsequently, pull multiple weighted sleeves 1 away from each other. The multiple weighted sleeves 1 are pulled away from each other and unfold. The end of the connecting member 2 will slide along the corresponding connecting groove 12, so that the connecting member 2 is exposed from the gap position between adjacent weighted sleeves 1. The end of the connecting member 2 is connected to the bottom of the connecting groove 12 through the anti-detachment rope 21. Therefore, the end of the connecting member 2 will not move out of the connecting groove 12, maintaining the connection of the connecting member 2 within the connecting groove 12. The multiple weighted sleeves 1 can also be connected through the connecting member 2 after being unfolded and separated from each other. Since the weighted sleeve 1 is in an unfolded state, the weighting force of the weighted sleeve 1 on the cable is dispersed, avoiding concentrated weighting. The dispersed weighting increases the weighting area of the cable bottom contact section. When the cable is impacted by ocean currents, the stability of the cable is increased through the chain-like weighting, avoiding concentrated bending, which is beneficial to the protection of the cable. After the multiple weighted sleeves 1 are unfolded and dispersed and fall to the seabed position, the mud or vegetation on the seabed will get stuck in the gap between adjacent weighted sleeves 1, thereby increasing the friction between the cable and the seabed, preventing the cable from shifting with the impact of seawater, and further improving the stability of the cable at the seabed position.

[0023] Embodiment 2: A driving groove 15 is provided inside the weighted sleeve 1 located at the middle position; a driving plate 3 is slidably and sealingly connected inside the driving groove 15; a driving rod 31 is fixedly connected to the side of the driving plate 3 facing away from the cable groove 11; one end of the driving rod 31 away from the driving plate 3 passes through the weighted sleeve 1 and extends to the outside, and is fixedly connected to a driving ring 32; the driving plate 3 divides the internal space of the driving groove 15 into a rod chamber 151 and a rodless chamber 152; the rodless chamber 152 is communicated with the outside of the weighted sleeve 1 through a first one-way air inlet hole 153, and the first one-way air inlet hole 153 is arranged inside the driving rod 31; the rodless chamber 152 is communicated with the bottom of the connecting groove 12 inside the same weighted sleeve 1 through a first one-way air outlet hole 154; the connecting groove 12 is slidably and sealingly connected with the connecting member 2; the locking groove 13 is slidably and sealingly connected with the locking block 14; the bottom of the locking groove 13 is communicated with the bottom of the connecting groove 12 inside the same weighted sleeve 1; two connecting grooves 12 in adjacent two weighted sleeves 1 are communicated through a connecting hole 16; the connecting hole 16 is arranged inside the connecting member 2; a clamping groove 17 is provided on the groove wall of the cable groove 11; a clamping block 4 is slidably and sealingly connected inside the clamping groove 17; the bottom of the clamping groove 17 is communicated with the bottom of the connecting groove 12 inside the same weighted sleeve 1.

[0024] In this embodiment, a pressure relief groove 18 is provided on the outer wall of the counterweight sleeve 1; a pressure relief block 5 is slidably and sealingly connected in the pressure relief groove 18; the pressure relief block 5 is connected to the bottom of the pressure relief groove 18 through a first tension spring 51, and the bottom of the pressure relief groove 18 is communicated with the outside air; a first pressure relief hole 19 communicated with the bottom of the locking groove 13 is provided on the outer wall of the counterweight sleeve 1; the first pressure relief hole 19 penetrates through the pressure relief groove 18; a second pressure relief hole 52 is provided through the pressure relief block 5; the pressure relief block 5 can drive the second pressure relief hole 52 to be staggered or communicated with the first pressure relief hole 19; the connecting member 2 is connected to the bottom of the connecting groove 12 through a second tension spring 22; the locking block 14 is connected to the bottom of the locking groove 13 through a third tension spring 141; the clamping block 4 is connected to the bottom of the clamping groove 17 through a fourth tension spring 41.

[0025] After aligning the cable slots 11 on the multiple counterweight sleeves 1 in the folded state with the cable, the cable is snapped into the deepest position of the cable slot 11. Subsequently, the drive ring 32 is controlled to pull and push the drive rod 31 to move axially back and forth. The drive plate 3 will move along with the movement of the drive rod 31, and the drive plate 3 will slide back and forth along the inner wall of the drive slot 15. When the drive plate 3 moves away from the cable slot 11, the space in the rodless cavity 152 becomes larger to form a negative pressure, and the outside air enters the rodless cavity 152 along the first one-way air inlet hole 153. When the drive plate 3 moves closer to the cable slot 11, the space in the rodless cavity 152 becomes smaller and the air pressure increases. The compressed air in the rodless cavity 152 enters the connection slot 12 inside the same counterweight sleeve 1 along the first one-way air outlet hole 154. For the convenience of description, the multiple counterweight sleeves 1 are named the middle counterweight sleeve 1 and the two side counterweight sleeves 1. In this way, the connection slot 12 inside the middle counterweight sleeve 1 is filled with gas first. The gas in the connection slot 12 inside the middle counterweight sleeve 1 enters the locking slot 13 and the clamping slot 17 inside the middle counterweight sleeve 1. The gas in the locking slot 13 inside the middle counterweight sleeve 1 pushes the locking block 14 to slide along the locking slot 13 and into the cable slot 11. The locking block 14 restricts the cable in the deep position of the cable slot 11. The gas in the clamping slot 17 inside the middle counterweight sleeve 1 pushes the clamping block 4 to slide along the clamping slot 17 and into the cable slot 11. The clamping block 4 abuts against the outer wall of the cable to clamp the cable. After clamping, the counterweight position of the cable will not shift, ensuring the constancy of the counterweight position and being applicable to cables with different diameters for counterweight; the gas in the connection slot 12 inside the middle counterweight sleeve 1 also enters the connection slot 12 inside the two side counterweight sleeves 1 along the connection hole 16. The connection slots 12 inside the two side counterweight sleeves 1 conduct the gas into the locking slots 13 inside the two side counterweight sleeves 1, causing the locking blocks 14 inside the two side counterweight sleeves 1 to extend out of the locking slots 13 and into the cable slot 11, thereby restricting the cables on the two side counterweight sleeves 1 in the deep position of the cable slot 11. As the air pressure inside the connection slots 12 of the middle counterweight sleeve 1 and the two side counterweight sleeves 1 increases, the end of the connecting piece 2 moves away from the bottom of the connection slot 12. In this way, all the counterweight sleeves 1 move away from each other to form a gap and unfold, and all the counterweight sleeves 1 automatically change from the folded state to the unfolded state;When it is necessary to remove the protective cover from the counterweight position of the cable, it is necessary to pull the pressure relief block 5 to move away from the bottom of the pressure relief groove 18. The end of the pressure relief block 5 away from the bottom of the pressure relief groove 18 can be set to a hook shape, so as to better drive the pressure relief block 5 to slide along the pressure relief groove 18. The pressure relief block 5 needs to overcome the first tension spring 51 to slide in the pressure relief groove 18. The second pressure relief hole 52 on the pressure relief block 5 is connected with the first pressure relief hole 19 after the pressure relief block 5 moves, so that the locking groove 13, the clamping groove 17 and the connecting groove 12 in the middle counterweight sleeve 1 are all connected with the outside world. The third tension spring 141 will pull the locking block 14 to move close to the bottom of the locking groove 13 to release the restriction on the cable in the cable groove 11. The fourth tension spring 41 will pull the clamping block 4 to move close to the bottom of the clamping groove 17 to release the clamping of the cable. The spring 22 will pull the end of the connector 2 close to the bottom of the corresponding connecting groove 12, so that the multiple counterweight sleeves 1 move closer to each other, and the gas in the locking groove 13, the clamping groove 17 and the connecting groove 12 will flow out along the first pressure relief hole 19, and then the pressure relief block 5 is released, and the first tension spring 51 will pull the pressure relief block 5 to slide in the pressure relief groove 18. The second pressure relief hole 52 on the pressure relief block 5 is staggered with the first pressure relief hole 19, so that the multiple counterweight sleeves 1 are locked after folding; this embodiment drives the driving plate 3 to slide back and forth in the driving groove 15 by controlling the driving rod 31, so that the multiple counterweight sleeves 1 are transformed from the folded state to the unfolded state, and the multiple counterweight sleeves 1 can be locked on the outer wall of the cable by themselves, which greatly facilitates the loading and unloading of the protective cover compared with the original method of manually pulling apart the multiple counterweight sleeves 1 in sequence. ;

[0026] Embodiment 3: The wall of the cable trough 11 is provided with a reinforcement groove 111 aligned with the locking groove 13 ; the end of the locking block 14 away from the bottom of the locking groove 13 can be inserted into the reinforcement groove 111 .

[0027] In this embodiment, the driving rod 31 is connected to the counterweight sleeve 1 in a sliding and sealing manner; the rod cavity 151 is connected to the outside of the counterweight sleeve 1 through the second one-way air inlet hole 155; the rod cavity 151 is connected to the bottom of the connecting groove 12 inside the same counterweight sleeve 1 through the second one-way air outlet hole 156.

[0028] In this embodiment, the tension of the third tension spring 141 is smaller than the tension of the fourth tension spring 41 ; and the tension of the fourth tension spring 41 is smaller than the tension of the second tension spring 22 .

[0029] In this embodiment, the one-way valves in the first one-way air outlet 154 and the first one-way air inlet 153 are both close to the rodless cavity 152 , and the one-way valves in the second one-way air outlet 156 and the second one-way air inlet 155 are both close to the rod cavity 151 .

[0030] During the process of the control drive ring 32 driving the drive rod 31 to move closer to or away from the cable groove 11, the drive plate 3 will slide back and forth in the drive groove 15. When the drive plate 3 moves closer to the cable groove 11, the space in the rodless cavity 152 becomes smaller and the air pressure increases. Thus, the gas in the rodless cavity 152 is compressed and enters the connecting groove 12 in the same counterweight sleeve 1 along the first one-way air outlet hole 154. The space in the rod chamber 151 becomes larger to form a negative pressure, and the outside air will enter the rod chamber 151 along the second one-way air inlet hole 155 for gas replenishment. When the drive plate 3 moves away from the cable groove 11, the space in the rodless cavity 152 becomes larger to form a negative pressure, and the outside air will enter the rodless cavity 152 along the first one-way air inlet hole 153 for gas replenishment. The space in the rod chamber 151 becomes smaller and the air pressure increases. Thus, the gas in the rod chamber 151 is compressed and enters the connecting groove 12 in the same counterweight sleeve 1 along the second one-way air outlet hole 156. In this way, whether the drive plate 3 moves closer to or away from the cable groove 11, the connecting groove 12 in the middle counterweight sleeve 1 can be continuously filled with gas, so that the deployment efficiency and installation efficiency of the multiple counterweight sleeves 1 are relatively high, meeting the use requirements; when the connecting groove 12 in the middle counterweight sleeve 1 is continuously filled with gas, the locking groove 13, the clamping groove 17 and other connecting grooves 12 will all enter gas. Since the pulling forces of the third tension spring 141, the fourth tension spring 41 and the second tension spring 22 increase in sequence, the third tension spring 141 is pulled first, and the locking block 14 will be pushed by the gas first and slide along the locking groove 13. The end of the locking block 14 away from the locking groove 13 will enter the strengthening groove 111. In this way, when both ends of the locking block 14 are restricted, the restriction intensity of the locking block 14 on the cable is improved; then the fourth tension spring 41 is pulled, and the clamping block 4 will be driven only after all the locking blocks 14 have completed moving. The clamping block 4 will overcome the pulling force of the fourth tension spring 41 and press against the outer wall of the cable, so that the middle counterweight sleeve 1 and the cable are clamped. Finally, the second tension spring 22 is pulled, and the multiple counterweight sleeves 1 will move away from each other and expand. Since the middle counterweight sleeve 1 is connected to the cable, the counterweight sleeves 1 on both sides will expand at the positions on both sides of the middle counterweight sleeve 1. In this way, the weight position of the cable will not be affected after the counterweight sleeves 1 are expanded; after the first pressure relief hole 19 is communicated with the second pressure relief hole 52, the multiple counterweight sleeves 1 first move closer to each other, then the clamping block 4 retracts into the clamping groove 17, and finally the locking block 14 retracts into the locking groove 13; in this embodiment, the locking block 14 and the clamping block 4 work first before the multiple counterweight sleeves 1 move away from each other and expand, so that the multiple counterweight sleeves 1 on the cable are installed and clamped first before they expand, avoiding the situation that the counterweight sleeves 1 fall off from the outer wall of the cable and the weight position shifts during the expansion process, making the installation of the protective sleeve on the cable smoother.

[0031] Embodiment 4: The connecting member 2 is composed of a connecting block 23 and connecting bars 24; the number of the connecting block 23 and the connecting bars 24 is two; a rotating groove 241 is provided at the end of one of the connecting bars 24; a rotating block 242 is rotatably and sealingly connected in the rotating groove 241; the rotating block 242 is fixedly connected to the end of the other connecting bar 24; one end of the two connecting bars 24 close to each other is rotatably connected through the rotating block 242 and the rotating groove 241, and the other ends of the two connecting bars 24 far from each other are fixedly connected to the connecting block 23; the connecting block 23 is slidably and sealingly connected in the corresponding connecting groove 12 and is connected to the second tension spring 22 and the anti-disengagement rope 21.

[0032] In this embodiment, the rotating block 242 is connected to the groove wall of the rotating groove 241 through a torsion spring 25; the lengths of the two connecting bars 24 are kept consistent under the torsion of the torsion spring 25.

[0033] In this embodiment, one of the connecting blocks 23 in the connecting member 2 is movably and sealingly connected in the connecting groove 12 with a corrugated groove wall; the wave crests and wave troughs of the connecting groove 12 with a corrugated groove wall correspond to each other.

[0034] The connecting hole 16 in the connecting member 2 will pass through one of the connecting blocks 23, one of the connecting strips 24, the rotating block 242, the rotating groove 241, another connecting strip 24 and another connecting block 23, so that multiple connecting grooves 12 are filled with gas. After the gas enters the multiple connecting grooves 12, the gas will push the connecting block 23 in the connecting member 2 away from the bottom of the corresponding connecting groove 12, so that the connecting strip 24 in the connecting member 2 is moved out of the connecting groove 12, and the multiple counterweight sleeves 1 are separated from each other and unfolded. The multiple counterweight sleeves 1 will also be installed on the outer wall of the cable. After the counterweight sleeve 1 is put into the seabed, the cable will bend under the impact of the ocean current. The connecting strips 24 between adjacent counterweight sleeves 1 are connected by rotation through the torsion spring 25. Therefore, the counterweight sleeve 1 can ensure that the counterweight can bend with the bending of the cable to avoid damage caused by concentrated bending of the cable; after the cable bends and passes through the ocean current, the torsion spring 25 will drive the rotating block 242 to reverse in the rotating groove 241. Rotation makes the two rotatably connected connecting strips 24 maintain the same length direction under the torsion force of the torsion spring 25, preparing for the next cable bending; when the counterweight sleeve 1 is removed from the cable and folded, the second tension spring 22 will pull the connecting block 23 in the connecting piece 2 close to the bottom of the corresponding connecting groove 12, and one of the connecting blocks 23 in the connecting piece 2 will fluctuate back and forth in the process of approaching the bottom of the connecting groove 12 where the corrugated groove wall is set. During the back and forth fluctuation of one of the connecting blocks 23 in the connecting piece 2, the two connecting strips 24 and the other connecting block 23 will be driven to fluctuate, thereby driving the adjacent counterweight sleeves 1 to fluctuate, so that the adjacent counterweight sleeves 1 are staggered back and forth in the process of approaching each other, and the impurities in the gap between the adjacent counterweight sleeves 1 fall off under the rubbing, thus avoiding the residual impurities affecting the folding of the adjacent counterweight sleeves 1, so that multiple counterweight sleeves 1 can be folded more smoothly and stably, further meeting the use requirements.

[0035] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as limiting the scope of protection of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0036] The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A flame-retardant cable protective sleeve that resists external forces and withstands pressure, comprising a weight sleeve and a cable trough whose outer wall extends toward the center; characterized in that: There are multiple counterweight sleeves; aligned connecting grooves are provided on the sides of two adjacent counterweight sleeves close to each other; adjacent connecting grooves are staggered in the circumferential direction of the counterweight sleeve; adjacent counterweight sleeves are connected by connecting pieces; the ends of the connecting pieces are slidably connected in the corresponding connecting grooves; the ends of the connecting pieces are connected to the bottoms of the corresponding connecting grooves through anti-slip ropes; the walls of the cable grooves are provided with locking blocks that can limit the cables inside the cable grooves; multiple counterweight sleeves can be folded and contacted close to each other and spread out away from each other.

2. The external force resistant and pressure resistant flame retardant cable protective sheath according to claim 1, characterized in that: A driving groove is provided inside the counterweight sleeve located in the middle position; the driving groove is connected to the driving plate with a sliding seal; the driving plate is fixedly connected to the driving rod on the side facing away from the cable groove; the driving rod extends to the outside through the counterweight sleeve at one end away from the driving plate; the driving plate divides the internal space of the driving groove into a rod cavity and a rodless cavity; the rodless cavity is connected to the outside of the counterweight sleeve through a first one-way air inlet hole; the rodless cavity is connected to the bottom of the connecting groove inside the same counterweight sleeve through a first one-way air outlet hole; the connecting groove is connected to the connecting piece with a sliding seal; the locking groove provided on the wall of the cable groove is connected to the locking block with a sliding seal; the bottom of the locking groove is connected to the bottom of the connecting groove inside the same counterweight sleeve; the two connecting grooves in two adjacent counterweight sleeves are connected through a connecting hole; the connecting hole is provided inside the connecting piece; the cable groove wall is provided with a clamping groove; the sliding seal in the clamping groove is connected to the clamping block; the bottom of the clamping groove is connected to the bottom of the connecting groove inside the same counterweight sleeve.

3. The flame-retardant cable protective sheath resistant to external forces and pressure according to claim 2 is characterized in that: The outer wall of the counterweight sleeve is provided with a pressure relief groove; the elastic sliding seal in the pressure relief groove is connected to the pressure relief block; the outer wall of the counterweight sleeve is provided with a first pressure relief hole connected to the bottom of the locking groove; the first pressure relief hole passes through the pressure relief groove; the pressure relief block is penetrated by a second pressure relief hole; the connecting piece is connected to the bottom of the connecting groove through a second tension spring; the locking block is connected to the bottom of the locking groove through a third tension spring; the clamping block is connected to the bottom of the clamping groove through a fourth tension spring.

4. The external force resistant and pressure resistant flame retardant cable protective sheath according to claim 2, characterized in that: The cable trough wall is provided with a reinforcement groove aligned with the locking groove.

5. The external force resistant and pressure resistant flame retardant cable protective sheath according to claim 2, characterized in that: The driving rod is connected to the counterweight sleeve in a sliding and sealing manner; the rod cavity is connected to the outside of the counterweight sleeve through a second one-way air inlet hole; the rod cavity is connected to the bottom of the connecting groove inside the same counterweight sleeve through a second one-way air outlet hole.

6. The external force resistant and pressure resistant flame retardant cable protective sheath according to claim 3, characterized in that: The tension of the third tension spring is smaller than the tension of the fourth tension spring; and the tension of the fourth tension spring is smaller than the tension of the second tension spring.

7. The external force resistant and pressure resistant flame retardant cable protective sheath according to claim 1, characterized in that: The connecting piece is composed of a connecting block and a connecting strip; a rotating groove is provided at the end of one of the connecting strips; the rotating block is connected to the rotating block through a rotating seal in the rotating groove; the rotating block is fixedly connected to the end of another connecting strip; the two connecting strips are connected to each other through the rotating block and the rotating groove at one end close to each other, and the two connecting strips are fixedly connected to the connecting block at one end away from each other; the connecting block is movably sealed and connected in the corresponding connecting groove and is connected to the second tension spring.

8. The external force resistant and pressure resistant flame retardant cable protective sheath according to claim 7, characterized in that: The rotating block is connected to the rotating groove wall through a torsion spring; the length directions of the two connecting strips remain consistent under the torsion force of the torsion spring.

9. The external force resistant and pressure resistant flame retardant cable protective sheath according to claim 7, characterized in that: One of the connecting blocks in the connecting member is movably sealed and connected in the connecting groove of the corrugated groove wall; the crests and troughs on the connecting groove of the corrugated groove wall correspond to each other.

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