A load-bearing towing head assembly for armored cables and an integration method

Abstract

The present invention discloses a load-bearing towing head assembly for armored cables and an integration method. The load-bearing towing head assembly for armored cables includes: a cabin body, an inner conical sleeve, a limiting ring, a split conical part, and a wire winding ring assembly. A first end cover is arranged at the rear end of the cabin body. The inner conical sleeve is arranged in the cabin body with the conical surface pointing to the first end cover. The limiting ring and the split conical part are sleeved outside the inner conical sleeve, and the split conical part is located in front of the limiting ring. N layers of non-metallic fiber armored load-bearing layers are sequentially arranged from outside to inside in the armored cable. The wire winding ring assembly includes M wire winding rings that are arranged at intervals before and after in the cabin body and are located on the front side of the inner conical sleeve. Through the winding of fiber bundles on the wire winding rings and the braiding or knotting treatment after passing through the inside or outside of the limiting ring, the tension of the fiber bundles is ensured under the action of the split conical part. The structure after glue filling treatment is more stable, improving the reliability and stability, and can meet the use requirements of a water depth of 6000 meters and a large tensile force of 1500 KN.

Description

Technical Field

[0001] The present invention relates to the field of load-bearing towing heads for armored cables, and in particular to a load-bearing towing head assembly for armored cables and an integration method thereof. Background Art

[0002] An underwater towing detection system installs various observation instruments onto an underwater or in-water observation platform through an underwater composite towing cable to achieve long-term, continuous, and real-time observation of the ocean, and is widely used in fields such as ocean scientific research, ocean resource exploration, and marine biology research.

[0003] The load-bearing towing head assembly is an important part of the transmission of an underwater towing detection system. On the one hand, it provides power supply for the underwater part of the system, and at the same time, it also undertakes the high-speed transmission of information between water and underwater, and is an important "connection link".

[0004] At present, the load-bearing towing cables used in ocean towing systems have covered a water depth of 6000 meters. The working environment is harsh, and it is affected by factors such as sea swells and ocean currents. Therefore, higher requirements are put forward for the design and optimization of load-bearing towing cables.

[0005] In order to reduce the adverse effects of self-weight on the load-bearing towing cable, an armored cable with multiple layers of non-metallic fibers (such as aramid) armor can be used. Compared with traditional steel wire armored cables, this structural form can reduce the weight by at least 30% or more under the same tensile strength requirements.

[0006] In order to meet the requirements of a water depth of 6000 meters for the underwater detection system and a component breaking tensile force of 1500 kN, the armored cable used requires 5 to 6 layers of non-metallic fiber armor, which puts forward higher requirements for the structure and integration method of the load-bearing towing head assembly.

[0007] In the prior art, a patent application with the publication number CN 109436253 A discloses a towing head and an assembly method for an underwater towing system, a patent application with the publication number CN219393845U discloses a high-efficiency aramid load-bearing connection component, a patent application with the publication number CN 206041447 U discloses an armored optoelectronic composite load-bearing towing head, and a patent application with the publication number CN118888191B discloses a load-bearing towing head assembly for a hybrid armored composite cable and an integration method thereof. Most of them fix the armored steel wire or non-metallic fiber by means of inner and outer tapered sleeves. Limited by the structure, the fixation of 5 to 6 layers of armored fibers cannot be carried out, the connection efficiency and tensile strength requirements are low, and it cannot meet the requirements of a water depth of 6000 meters and a large tensile force of 1500 KN. The connection reliability and stability cannot adapt to complex sea conditions. Summary of the Invention

[0008] The main technical problem to be solved by the present invention is to provide a load-bearing towing head assembly and an integration method for armored cables, which can improve the connection construction efficiency, reliability and stability, and meet the use requirements of a water depth of 6000 meters and a large tensile force of 1500 KN.

[0009] To solve the above technical problem, a technical solution adopted by the present invention is: to provide a load-bearing towing head assembly for armored cables, including: a cabin, an inner cone sleeve, a limit ring, a split conical member and a wire winding ring assembly. A first end cover is provided at the rear end of the cabin. The inner cone sleeve is arranged in the cabin with its conical surface pointing to the first end cover. The limit ring and the split conical member are sleeved outside the inner cone sleeve, and the split conical member is located in front of the limit ring. The armored cable is sequentially provided with N layers of non-metallic fiber armored load-bearing layers from outside to inside. The wire winding ring assembly includes M wire winding rings arranged at intervals in the front and back in the cabin and located on the front side of the inner cone sleeve, and M ≤ N. A first support member is connected or directly connected between the front end of the inner cone sleeve and the adjacent wire winding ring, and a second support member is provided between adjacent two wire winding rings.

[0010] In a preferred embodiment of the present invention, the cabin and the first end cover adopt an integral welding structure or a split assembly structure. A first through hole corresponding to the outer wall of the armored cable is provided in the first end cover. A first threaded hole is provided at the outer end of the first through hole. A first locking nut is provided on the first threaded hole. A first tapered hole is provided in the first through hole in front of the first threaded hole. A first tapered sealing sleeve is provided in the first tapered hole. A first washer is provided between the first tapered sealing sleeve and the first locking nut.

[0011] In a preferred embodiment of the present invention, a second end cover is provided at the front end of the cabin. A first screw for connecting with the cabin is provided on the second end cover. A second through hole corresponding to the inner sheath of the armored cable is provided in the second end cover. A second threaded hole is provided at the outer end of the second through hole. A second locking nut is provided on the second threaded hole. A second tapered hole is provided in the second through hole behind the second threaded hole. A second tapered sealing sleeve is provided in the second tapered hole. A second washer is provided between the second tapered sealing sleeve and the second locking nut. A sealing ring in contact with the inner wall of the cabin is provided on the second end cover.

[0012] In a preferred embodiment of the present invention, a bending limiter mounting hole is provided on the first end cover, and an equipment mounting hole is provided on the second end cover.

[0013] In a preferred embodiment of the present invention, the split conical member includes two symmetrically distributed semi-circular rings and a second screw for fixing the two semi-circular rings.

[0014] In a preferred embodiment of the present invention, the adjacent two winding rings are connected and fixed by setting a third screw, and the outer diameter of the front winding ring is not less than that of the rear winding ring.

[0015] In a preferred embodiment of the present invention, the second support member is a hollow tube, and the third screw penetrates through the corresponding hollow tube.

[0016] In a preferred embodiment of the present invention, the first support members are distributed in an annular array, and potting glue is provided in the cabin.

[0017] To solve the above technical problems, another technical solution adopted by the present invention is: to provide an integrated method for a load-bearing tow head, including the following steps:

[0018] a. Pass the end of the armored cable through the first through hole of the first locking nut, the first washer, the first conical seal sleeve and the first end cover in sequence, and expose the end of the armored cable.

[0019] b. Separate the non-metallic fiber armored load-bearing layer at the end of the armored cable. The N non-metallic fiber armored load-bearing layers are divided into the first non-metallic fiber armored load-bearing layer, the second non-metallic fiber armored load-bearing layer... the Nth non-metallic fiber armored load-bearing layer in the order from outside to inside, and the M winding rings are divided into the first winding ring, the second winding ring... the Mth winding ring in the order from back to front.

[0020] c. First, disperse the non-metallic fibers in the first non-metallic fiber armored load-bearing layer and evenly divide them into several fiber bundles. After winding each fiber bundle around the first winding ring for at least one circle, pass it through the inside of the limiting ring along the outer wall of the inner conical sleeve and extend backward.

[0021] d. Then, disperse the non-metallic fibers in the second non-metallic fiber armored load-bearing layer and evenly divide them into several fiber bundles. After winding each fiber bundle around the second winding ring or the first winding ring for at least one circle, pass it through the inside or outside of the limiting ring along the outer wall of the inner conical sleeve and extend backward.

[0022] e. Process the inner non-metallic fiber armored load-bearing layers in the above manner in sequence, and each winding ring is at least used for winding the fiber bundles on one layer of the non-metallic fiber armored load-bearing layer.

[0023] f. Group and braid or knot the fiber bundles at the rear of the limiting ring to realize pre-stretching of the fiber bundles.

[0024] g. Install the split conical part on the front side of the limiting ring, hold all the fiber bundles, apply a pre-tightening force by tightening the second screw, force the limiting ring to move backward, and ensure the tension of the fiber bundles.

[0025] h. Pull the trailing armored cable backward so that the inner cone sleeve retracts into the cabin body and abuts against the first end cover. Screw the first locking nut into the first threaded hole, and press the first conical sealing sleeve through the first washer so that the first conical sealing sleeve tightly holds the outer wall of the armored cable for elastic sealing;

[0026] i. Vertically place the cabin body on the bracket, fix the first end cover at the bottom of the cabin body at this time through the flange on the bracket, and perform multiple-layer potting treatment through the port at the top of the cabin body;

[0027] j. Install the second end cover on the cabin body, ensure that the inner sheath of the armored cable penetrates through the second end cover and extends upward, and install the second locking nut on the second end cover. Press the second conical sealing sleeve through the second washer so that the second conical sealing sleeve tightly holds the inner sheath of the armored cable for elastic sealing.

[0028] In a preferred embodiment of the present invention, the fiber bundles on at least one non-metallic fiber armored load-bearing layer extend backward from the outside of the limiting ring, and each group of fiber bundles subjected to weaving or knotting treatment contains fibers in multiple non-metallic fiber armored load-bearing layers.

[0029] The beneficial effects of the present invention are as follows: A load-bearing towhead assembly and an integration method for an armored cable pointed out by the present invention ensure the tension of the fiber bundles under the action of the split conical part through the winding of the fiber bundles on the winding ring and the weaving or knotting treatment after passing through the inside or outside of the limiting ring. The structure after potting treatment is more stable, and they work together when resisting tension, improving reliability and stability. It can meet the use requirements of a water depth of 6000 meters and a large tension of 1500 KN, and the connection construction is convenient and the work efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for description in the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings, where:

[0031] Figure 1 is a schematic structural diagram of a preferred embodiment of a load-bearing towhead assembly for an armored cable of the present invention;

[0032] Figure 2 is Figure 1 the schematic structural diagram after removing the cabin body of;

[0033] Figure 3 is a schematic structural diagram of a preferred embodiment of the bracket used in the integration method of a load-bearing towhead of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0035] Please refer to Figures 1 to 3 , the embodiments of the present invention include:

[0036] As Figure 1 and Figure 2 shown, the load-bearing towing head assembly 100 for armored cable is used for the load-bearing connection of the armored cable 200, and includes: a cabin body 110, an inner tapered sleeve 190, a limiting ring 160, a split-type tapered part 150 and a wire winding ring assembly. A first end cover 120 is arranged at the rear end of the cabin body 110. The cabin body 110 and the first end cover 120 can adopt an integrated welding structure or a split assembly structure. In this embodiment, the cabin body 110 and the first end cover 120 are integrally welded, with a firm structure and good sealing performance.

[0037] A first through hole corresponding to the outer wall of the armored cable 200 is arranged in the first end cover 120, which is convenient for the insertion construction of the armored cable 200. A first threaded hole is arranged at the outer end of the first through hole, and a first locking nut 121 is arranged on the first threaded hole. A first tapered hole is arranged in the first through hole in front of the first threaded hole, and a first tapered sealing sleeve 123 is arranged in the first tapered hole. A first washer 122 is arranged between the first tapered sealing sleeve and the first locking nut. After tightening the first locking nut 121, the first tapered sealing sleeve 123 is pressed by the first washer 122 to realize the wrapping and sealing of the armored cable 200.

[0038] As Figure 1 shown, the inner tapered sleeve 190 is arranged in the cabin body 110, and the tapered surface points to the first end cover 120. The limiting ring 160 and the split-type tapered part 150 are sleeved outside the inner tapered sleeve 190, and the split-type tapered part 150 is located in front of the limiting ring 160. In this embodiment, the split-type tapered part 150 includes two symmetrically distributed semi-rings 151 and a second screw 152 for fixing the two semi-rings, which is convenient for assembly.

[0039] N layers of non-metallic fiber armored load-bearing layers 220 are sequentially arranged from outside to inside in the armored cable 200. In this embodiment, 6 layers of aramid armored load-bearing layers are adopted, with high tensile strength. The wire winding ring assembly includes 5 wire winding rings 140 arranged at intervals in the cabin body 110 and located in front of the inner tapered sleeve. As Figure 2 shown, the outer diameter of the front wire winding ring is larger than that of the rear wire winding ring, forming a pagoda structure. The outer diameter of the foremost wire winding ring is larger. During the assembly process, the fibers in the innermost 2 layers of non-metallic fiber armored load-bearing layers share the foremost wire winding ring, which is beneficial to reducing costs.

[0040] In this embodiment, a first support member 170 is provided and connected between the front end of the inner conical sleeve 190 and the adjacent winding ring. It is fixed by welding. The first support members 170 are distributed in an annular array, providing good support for the winding ring without affecting the potting construction. A second support member 180 is provided between two adjacent winding rings, increasing the distance between the two winding rings 140, which is beneficial to the fixation of the fibers after potting, extending the path of fiber fixation and increasing the contact between the potting adhesive and the fibers.

[0041] To improve the structural stability, two adjacent winding rings are connected and fixed by setting a third screw 181. In this embodiment, the second support member 180 is a hollow tube, and the third screw 181 passes through the corresponding hollow tube, realizing the fixation of the second support member 180 with reliable structure.

[0042] Potting adhesive is provided in the cabin 110. In this embodiment, resin potting adhesive is used for fixation after fiber winding and tensioning, improving the structural stability and tensile effect.

[0043] A second end cover 130 is provided at the front end of the cabin 110. A first screw 136 for connecting with the cabin 110 is provided on the second end cover 130, facilitating assembly. A sealing ring 135 in contact with the inner wall of the cabin 110 is provided on the second end cover 130, with good sealing effect to prevent water ingress. A second through hole corresponding to the inner sheath 210 of the armored cable 200 is provided in the second end cover 130, facilitating the extension of the inner sheath 210.

[0044] A second threaded hole is provided at the outer end of the second through hole. A second locking nut 131 is provided on the second threaded hole. A second conical hole is provided in the second through hole behind the second threaded hole. A second conical sealing sleeve 133 is provided in the second conical hole. A second washer 132 is provided between the second conical sealing sleeve 133 and the second locking nut 131. After the second locking nut 131 is tightened, the second conical sealing sleeve 133 is pressed through the second washer 132 to achieve the wrapping and sealing of the inner sheath 210.

[0045] As Figure 1 shown, a bending limiter mounting hole 124 is provided on the first end cover 120, facilitating the installation and fixation of the bending limiter to limit the bending of the armored cable at the head position. Equipment mounting holes 134 are provided on the second end cover 130, facilitating the connection with working equipment.

[0046] An integrated method for a load-bearing tow head includes the following steps:

[0047] a. Pass the end of the armored cable 200 through the first locking nut 121, the first washer 122, the first tapered sealing sleeve 123, and the first through-hole of the first end cap 120 in sequence, and expose the end of the armored cable 200.

[0048] b. Separate the non-metallic fiber armored load-bearing layer at the end of the armored cable. The 6-layer non-metallic fiber armored load-bearing layer 220 is divided into the first non-metallic fiber armored load-bearing layer, the second non-metallic fiber armored load-bearing layer... the sixth non-metallic fiber armored load-bearing layer in the order from outside to inside. The 5 winding rings are divided into the first winding ring, the second winding ring... the fifth winding ring in the order from back to front.

[0049] c. First, disperse the non-metallic fibers in the first non-metallic fiber armored load-bearing layer and evenly divide them into H fiber bundles. After winding each fiber bundle 1.5 turns on the first winding ring, it passes through the inside of the limiting ring 160 along the outer wall of the inner tapered sleeve 190 and extends backward. The tapered surface in the limiting ring 160 corresponds to the outer wall of the inner tapered sleeve 190, and this part of the fiber bundle can be clamped.

[0050] d. Install the second winding ring, and then disperse the non-metallic fibers in the second non-metallic fiber armored load-bearing layer and evenly divide them into H fiber bundles (H takes values from 6 to 10). After winding each fiber bundle 1.5 turns on the second winding ring, it passes through the inside or outside of the limiting ring 160 along the outer wall of the inner tapered sleeve 190 and extends backward. After extension, the fiber bundles can be pre-fixed with tape or rubber bands first to avoid the problem of loosening.

[0051] e. As Figure 2 shown, process the inner non-metallic fiber armored load-bearing layer in the above manner in sequence. The fifth winding ring is for the fiber bundles on the fifth non-metallic fiber armored load-bearing layer and the sixth non-metallic fiber armored load-bearing layer to wind, which is beneficial to simplify the structure, reduce the volume of the cabin 110, and reduce costs.

[0052] f. Divide the fiber bundles into H groups for braiding or knotting treatment to realize pre-stretching of the fiber bundles. In this embodiment, the fiber bundles can be braided like braids to form H braid structures. Each group of fiber bundles in the braiding or knotting treatment contains the fibers in the 6-layer non-metallic fiber armored load-bearing layer, and the force is evenly distributed.

[0053] The fiber bundles on at least one non-metallic fiber armored load-bearing layer extend backward from the outside of the limiting ring, ensuring that after the fibers in the 6-layer non-metallic fiber armored load-bearing layer are braided behind the limiting ring, the backward limit of the limiting ring 160 is carried out, which is beneficial to tension the fibers through the limiting ring 160.

[0054] g. Install the Haversian conical part 150 on the front side of the limit ring, hold all the fiber bundles, apply a pre-tightening force by tightening the second screw, force the limit ring 160 to move backward, ensure the tension of the fiber bundles, avoid the fiber bundles wound on the winding ring being in a loose state, and facilitate the joint effort during tensile resistance;

[0055] h. Pull the armored cable 200 backward so that the inner conical sleeve 190 retracts into the cabin body 110 and abuts against the first end cover 120. Screw the first locking nut 121 into the first threaded hole, and press the first conical sealing sleeve 123 through the first washer 122 so that the first conical sealing sleeve 123 tightly holds the outer wall of the armored cable 200 for elastic sealing to avoid leakage during glue filling;

[0056] i. As Figure 3 shown, place the cabin body 110 vertically on the bracket 300, fix the first end cover 120 located at the bottom of the cabin body at this time through the flange 310 on the bracket 300, keep the cabin body 110 vertical, and perform multiple-layer glue filling treatment through the port at the top of the cabin body 110. After curing, fix the fibers; in this embodiment, the load-bearing drag head can withstand a breaking tensile force value of up to 2000 kN after glue filling;

[0057] j. Install the second end cover 130 on the cabin body, ensure that the inner sheath of the armored cable 200 penetrates through the second end cover 130 and extends upward, and install the second locking nut 131 on the second end cover 130. Press the second conical sealing sleeve 133 through the second washer 132 so that the second conical sealing sleeve 133 tightly holds the inner sheath 210 of the armored cable 200 for elastic sealing to improve the waterproof effect.

[0058] In summary, a load-bearing drag head assembly and an integration method for an armored cable pointed out by the present invention are applicable to armored cables with multiple non-metallic fiber armored load-bearing layers, are convenient to assemble, improve the connection reliability, and can meet the underwater dragging use requirements of large water depths and large tensile forces.

[0059] The above are only embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification of the present invention, or directly or indirectly applied to other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A load-bearing towing head assembly for armored cables, used for the load-bearing connection of armored cables, characterized in that, Comprising: A cabin body, an inner conical sleeve, a limiting ring, a split conical part and a winding ring assembly. A first end cover is arranged at the rear end of the cabin body. The inner conical sleeve is arranged in the cabin body with its conical surface pointing to the first end cover. The limiting ring and the split conical part are sleeved outside the inner conical sleeve, and the split conical part is located in front of the limiting ring. N non-metallic fiber armored load-bearing layers are sequentially arranged in the armored cable from outside to inside. The winding ring assembly comprises M winding rings which are arranged at intervals in the front and rear in the cabin body and are located on the front side of the inner conical sleeve, and M≤N. A first support member is connected or directly connected between the front end of the inner conical sleeve and the adjacent winding ring. A second support member is arranged between two adjacent winding rings. The split conical part comprises two symmetrically distributed semi-rings and a second screw for fixing the two semi-rings. The non-metallic fibers in each non-metallic fiber armored load-bearing layer are dispersed and evenly divided into several fiber bundles. Each fiber bundle is wound around the corresponding winding ring for at least one turn and then extends backward through the inner side or the outer side of the limiting ring along the outer wall of the inner conical sleeve. The fiber bundles are grouped and braided or knotted at the rear side of the limiting ring to realize pre-stretching of the fiber bundles. The fiber bundles on at least one non-metallic fiber armored load-bearing layer extend backward from the outer side of the limiting ring. Each group of fiber bundles for braiding or knotting contains fibers from multiple non-metallic fiber armored load-bearing layers. The split conical part holds all the fiber bundles, and a pre-tightening force is applied by tightening the second screw to force the limiting ring to move backward to ensure the tension of the fiber bundles.

2. The armored cable load-bearing towing head assembly according to claim 1, characterized in that, The cabin body and the first end cover adopt an integral welding structure or a split assembly structure. A first through hole corresponding to the outer wall of the armored cable is arranged in the first end cover. A first threaded hole is arranged at the outer end of the first through hole. A first locking nut is arranged on the first threaded hole. A first conical hole is arranged in the first through hole in front of the first threaded hole. A first conical sealing sleeve is arranged in the first conical hole. A first washer is arranged between the first conical sealing sleeve and the first locking nut.

3. The armored cable load-bearing towing head assembly according to claim 1, wherein, A second end cover is arranged at the front end of the cabin body. A first screw for connecting with the cabin body is arranged on the second end cover. A second through hole corresponding to the inner sheath of the armored cable is arranged in the second end cover. A second threaded hole is arranged at the outer end of the second through hole. A second locking nut is arranged on the second threaded hole. A second conical hole is arranged in the second through hole behind the second threaded hole. A second conical sealing sleeve is arranged in the second conical hole. A second washer is arranged between the second conical sealing sleeve and the second locking nut. A sealing ring in contact with the inner wall of the cabin body is arranged on the second end cover.

4. The armored cable load-bearing tow head assembly according to claim 3, characterized in that, A bending limiter mounting hole is arranged on the first end cover. An equipment mounting hole is arranged on the second end cover.

5. The load-bearing towhead assembly for armored cables according to claim 1, characterized in that, The two adjacent winding rings are fixedly connected by arranging a third screw. The outer diameter of the front-side winding ring is not less than the outer diameter of the rear-side winding ring.

6. The armored cable load-bearing towing head assembly according to claim 5, characterized in that, The second support member adopts a hollow tube, and the third screw penetrates through the corresponding hollow tube.

7. The armored cable load-bearing towing head assembly according to claim 1, characterized in that, The first support members are distributed in an annular array, and potting glue is arranged in the cabin body.

8. An integration method of the load-bearing towing head assembly for armored cables according to any one of claims 1 to 7, characterized in that, Including the following steps: Separate the non-metallic fiber armor bearing layer at the end of the armored cable. The N non-metallic fiber armor bearing layers are divided into the first non-metallic fiber armor bearing layer, the second non-metallic fiber armor bearing layer... the Nth non-metallic fiber armor bearing layer in the order from outside to inside. The M winding rings are divided into the first winding ring, the second winding ring... the Mth winding ring in the order from back to front; First, disperse the non-metallic fibers in the first non-metallic fiber armor bearing layer and evenly divide them into several fiber bundles. After winding each fiber bundle around the first winding ring for at least one turn, it passes through the inner side of the limit ring along the outer wall of the inner cone sleeve and extends backward; Then, disperse the non-metallic fibers in the second non-metallic fiber armor bearing layer and evenly divide them into several fiber bundles. After winding each fiber bundle around the second winding ring or the first winding ring for at least one turn, it passes through the inner side or the outer side of the limit ring along the outer wall of the inner cone sleeve and extends backward; Process the inner non-metallic fiber armor bearing layers in turn according to the above method, and each winding ring is used for winding the fiber bundles on at least one non-metallic fiber armor bearing layer; Group the fiber bundles and perform braiding or knotting treatment at the rear side of the limit ring to achieve pre-stretching of the fiber bundles; The fiber bundles on at least one non-metallic fiber armor bearing layer extend backward from the outside of the limit ring, and each group of fiber bundles for braiding or knotting treatment contains fibers from multiple non-metallic fiber armor bearing layers; Install the split conical part on the front side of the limit ring and hold all the fiber bundles. Apply a pre-tightening force by tightening the second screw to force the limit ring to move backward to ensure the tension of the fiber bundles; Vertically place the cabin on the bracket, fix the first end cover located at the bottom of the cabin at this time through the flange on the bracket, and perform multiple layered glue filling treatments through the port at the top of the cabin.

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