Non-metallic sheathed cable junction box reinforcement core tensioning device and method of manufacture

Abstract

The application discloses a non-metal armored cable joint box reinforcing core tensioning device and a manufacturing method. The device comprises a support, a tensioning unit and a limiting unit. The tensioning unit comprises a plurality of tensioning members uniformly distributed around a preset center line. Each tensioning member is a columnar member comprising a support connecting portion, a strand connecting portion, a driving interface portion and an anti-reversing portion at different axial positions. The support connecting portion is rotatably connected to the support around the central axis of the columnar member. The strand connecting portion is adapted to be fixedly connected to the end of the reinforcing core. The driving interface portion is adapted to be adaptively connected to a torque wrench, so that each tensioning member is positively rotated by the torque wrench. When the tensioning member is positively rotated under the drive of the torque wrench at a preset torque, the connected reinforcing core is tensioned and adjusted. The anti-reversing portion cooperates with the limiting unit to limit the reverse rotation of the tensioning member to loosen the reinforcing core. The application can simply and reliably realize the uniform stress of the reinforcing member.

Description

Technical Field

[0001] This invention relates to the field of non-metallic armored cable technology, and in particular to a tensioning device and manufacturing method for a non-metallic armored cable splice box reinforcing core. Background Technology

[0002] Aramid fiber is widely used in special cables in aerospace, marine engineering, optoelectronic communication and other fields as a lightweight reinforcing component to replace traditional steel wire due to its excellent properties such as high strength, high modulus, low density, high temperature resistance and corrosion resistance.

[0003] The joint of an aramid cable is the weakest link in the entire cable system. When fabricating a joint, clamps are typically used to secure the aramid reinforcement. Ensuring uniform stress distribution on each of the multiple reinforcement strands is a significant technical challenge. Uneven stress distribution can cause some reinforcement strands to reach their load-bearing limits prematurely and break, resulting in a joint strength far below theoretical values. This "weakest link" effect severely compromises the safety and reliability of the cable system.

[0004] Existing aramid cable splice manufacturing processes largely rely on operator experience, using manual tightening and adjustment for fixation. This makes it difficult to quantify and ensure the consistency of stress on each aramid reinforcement member, resulting in inconsistent finished product quality. Therefore, there is an urgent need for a non-metallic armored cable splice box reinforcing core tensioning device that can easily and reliably achieve uniform stress on the reinforcement members. Summary of the Invention

[0005] Therefore, the present invention provides a non-metallic armored cable junction box reinforcing core tensioning device and manufacturing method that can easily and reliably achieve uniform force distribution on the reinforcing member.

[0006] To solve the above technical problems, the present invention provides a tensioning device for the reinforcing core of a non-metallic armored cable junction box, including a support, a tensioning unit and a limiting unit. The tensioning unit and the limiting unit are both installed on the support. The tensioning unit includes a plurality of tensioning members evenly distributed around a preset center line. Each tensioning member is a columnar member, including a support connection part, a strand connection part, a drive interface part and an anti-reverse part located at different positions in its axial direction. The support connection part is rotatably connected to the support around the central axis of the columnar member; The strand connection portion is adapted to be fixedly connected to the end of the reinforcing core; The drive interface is adapted to be connected to a torque wrench, thereby driving each tensioning member to rotate in the forward direction through the torque wrench. When the tensioning member rotates in the forward direction under the drive of the torque wrench with a preset torque, the tension of the connected reinforcing core is adjusted. The anti-reverse part cooperates with the limiting unit to restrict the tensioning member from rotating in the opposite direction to the loosening reinforcing core.

[0007] Optionally, the support is an annular support surrounding the preset center line, the tensioning member is connected to the inner wall of the annular support, and the rotation center line of the tensioning member intersects the preset center line perpendicularly.

[0008] Optionally, the support includes a first semi-ring portion and a second semi-ring portion located at different positions in its circumference, the first semi-ring portion and the second semi-ring portion being hingedly connected between their ends at one of the mating positions, and the first semi-ring portion and the second semi-ring portion being lockable and separable between their ends at the other mating position.

[0009] Optionally, the support is provided with threaded holes corresponding to the tensioning members, and the support connection part is an external threaded post, which is screwed into the corresponding threaded hole.

[0010] Optionally, the strand connection part is a winding wheel, which is used to wind and temporarily fix the reinforcing core.

[0011] Optionally, the drive interface is an external hexagonal head, the size of which is adapted to the socket size of a standard torque wrench.

[0012] Optionally, the limiting unit includes a plurality of limiting members corresponding one-to-one with the plurality of tensioning members, each of the limiting members being mounted on the support and restricting the corresponding tensioning member from rotating in the opposite direction to the loosening reinforcing core.

[0013] Optionally, the anti-reverse part is a ratchet, and the limiting member is a pawl that cooperates with the ratchet, with the pawl elastically abutting against the ratchet.

[0014] Optionally, the support connection, the anti-reverse part, the strand connection, and the drive interface are arranged sequentially along the axial direction of the tensioning member.

[0015] This invention also provides a method for manufacturing a non-metallic armored cable splice box, employing the aforementioned non-metallic armored cable splice box reinforcing core tensioning device. The method for manufacturing the non-metallic armored cable splice box includes the following steps: S1. Peel off the outer sheath of the cable connector end by a predetermined length to expose all the reinforcing cores of the cable connector end; S2. Place a clamp on the outside of the cable joint end, and leave a gap between the clamp and the cable joint end. S3. Separate the reinforcing cores at the cable connector end and fix them to the multiple tensioning members respectively; S4. Align the central axis of the cable body with the preset center line and keep the relative position between the cable body and the support unchanged. Use a torque wrench to drive multiple tensioning members connected to the support to rotate in sequence with a preset torque, thereby gradually tightening the reinforcing core at the cable joint end until the torque wrench reaches the preset torque. S5. Keep the tension of the multi-strand reinforcing core at the cable joint end unchanged, and inject colloid into the inside of the clamp to ensure that the colloid completely wets and wraps all the reinforcing cores at the cable joint end. S6. After the colloid has completely cured, all the reinforcing cores at the cable joint end are firmly fixed in the clamp, forming a clamp-type joint end. S7. Separate all reinforcing cores from the tensioning components at the cable connector end.

[0016] Optionally, in step S2, the inner hole of the clamp is a tapered hole, the small end of the tapered hole is clamped to the cable joint end, and the large end of the tapered hole faces the same direction as the cable joint end and forms a gap with the reinforcing core.

[0017] Optionally, in step S2, a sealing ring is also provided between the end of the clamp and the cable body facing the opposite direction.

[0018] Optionally, in step S3, the reinforcing cores and strand connection parts of the cable connector end are fixed with glue.

[0019] Compared with the prior art, the above-mentioned technical solution of the present invention has the following advantages: The non-metallic armored cable splice box reinforcing core tensioning device and manufacturing method of the present invention, on the one hand, uses a torque wrench to drive and controls the tension of each reinforcing core through a preset torque, which can accurately quantify the tension and ensure that the tension of each reinforcing core is uniform. Because each reinforcing core is subjected to uniform force, stress concentration is avoided, making the actual load-bearing capacity of the splice significantly closer to the theoretical value, thus improving the overall strength and reliability of the splice. On the other hand, the entire process of the non-metallic armored cable splice end support is based on mechanical operation and quantified parameters (torque value), eliminating reliance on manual experience and ensuring the consistency of splice manufacturing quality. Furthermore, the reinforcing core tensioning device of the present invention consists of only a few simple components, is low in cost, small in size, and easy to carry, making it very suitable for on-site construction and rapid repair. Attached Figure Description

[0020] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0021] Figure 1 This is a perspective view of the non-metallic armored cable junction box reinforcing core tensioning device disclosed in Embodiment 1 of the present invention; Figure 2This is a side sectional view of the non-metallic armored cable junction box reinforcing core tensioning device disclosed in Embodiment 1 of the present invention; Figure 3 This is a top view of the non-metallic armored cable junction box reinforcing core tensioning device disclosed in Embodiment 1 of the present invention; Figure 4 This is a side view of the tensioning member disclosed in Embodiment 1 of the present invention.

[0022] Among them, 1. Non-metallic armored cable joint box reinforcing core tensioning device; 11. Support; 111. First half-ring; 112. Second half-ring; 113. Pin; 114. Buckle lock; 12. Tensioning component; 121. Support connection; 122. Strand connection; 123. Drive interface; 124. Anti-reverse part; 13. Limiting component; 2. Cable body joint end; 21. Reinforcing core; 22. Clamping component; 23. Gap; 24. Sealing ring. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0024] Example 1: See Figures 1 to 4 As shown, this invention discloses an embodiment of a non-metallic armored cable junction box reinforcing core tensioning device.

[0025] The aforementioned non-metallic armored cable junction box reinforcing core tensioning device 1 includes a support 11, a tensioning unit, and a limiting unit. The tensioning unit and the limiting unit are both installed on the support 11. The tensioning unit includes a plurality of tensioning members 12 evenly distributed around a preset center line. Each tensioning member 12 is a columnar member, including a support connection part 121, a strand connection part 122, a drive interface part 123, and an anti-reverse part 124 located at different positions in its axial direction. The aforementioned support connecting part 121 is rotatably connected to the aforementioned support 11; The aforementioned strand connection portion 122 is adapted to be fixedly connected to the end of the reinforcing core 21; The aforementioned drive interface 123 is adapted to be connected to a torque wrench, thereby driving each of the aforementioned tensioning members 12 to rotate in the forward direction through the torque wrench. When the aforementioned tensioning members 12 rotate in the forward direction under the drive of the torque wrench with a preset torque, the tension of the connected reinforcing core 21 is adjusted. The aforementioned anti-reverse part 124 cooperates with the aforementioned limiting unit, thereby limiting the reverse rotation of the aforementioned tensioning member 12 toward the loosening reinforcing core 21 through the aforementioned limiting unit.

[0026] Specifically, the reinforcing core 21 is the internal reinforcement structure of the cable body and is the object of tension adjustment of this device.

[0027] The non-metallic armored cable splice box reinforcing core tensioning device 1 is used to adjust the tension of the reinforcing core 21 of the cable body and maintain it in a tensioned state.

[0028] Support 11 is a basic load-bearing component used to install and fix the tensioning unit and the limiting unit, while providing a rotatable support connection point for the tensioning member 12.

[0029] The tensioning unit directly tensions the reinforcing core 21. The preset centerline serves as a reference axis for the circumferentially evenly arranged multiple tensioning elements 12, acting as the layout reference for the tensioning unit. Each tensioning element 12 is a columnar structure integrating four functions: rotational support, strand connection, torque input, and anti-reverse rotation. The support connection 121 is rotatably connected to the support 11, serving as the support point for the rotation of the tensioning element 12. The strand connection 122 is fixedly connected to the end of the reinforcing core 21, transmitting tension force to it. The drive interface 123 is designed to be compatible with a torque wrench, receiving external torque input to rotate the tensioning element 12. The torque wrench is a general-purpose tool for driving the tensioning element's rotation, outputting a preset torque for precise control of the tension force. Forward rotation causes the tensioning element 12 to tension the connected reinforcing core 21. The anti-reverse rotation part 124 cooperates with the limiting unit to restrict the reverse rotation of the tensioning element 12. Reverse rotation is the opposite of forward rotation, which will cause the tensioner 12 to loosen from the reinforcing core 21.

[0030] The limiting unit is used to prevent the tensioning member 12 from rotating in the opposite direction and loosening, so that the reinforcing core 21 maintains the preset tension, thereby positioning each reinforcing core 21 by the adhesive.

[0031] Based on the aforementioned tensioning device for the reinforcing core of the non-metallic armored cable splice box, a method for manufacturing a non-metallic armored cable splice box is described below, including the following steps: S1. Peel off the outer sheath of the cable connector end 2 by a predetermined length to expose all the reinforcing cores 21 of the cable connector end 2; S2. Fit a clamp 22 onto the outside of all the reinforcing cores 21 of the cable joint end 2, and leave a gap between the clamp 22 and the reinforcing cores 21 of the cable joint end 2. S3. Separate each reinforcing core 21 at the cable connector end 2 and fix them to the above-mentioned multiple tensioning members 12 respectively; S4. Align the central axis of the cable body with the preset center line and keep the relative position between the cable body and the support 11 unchanged. Use a torque wrench to drive the multiple tensioning members 12 initially connected to the support 11 to rotate in sequence with a preset torque, thereby gradually tightening the reinforcing core 21 of the cable joint end 2 until the torque wrench reaches the preset torque. S5. Keep the tension of the multi-strand reinforcing core 21 at the cable joint end 2 unchanged, and inject adhesive into the inside of the clamp 22 to ensure that the adhesive completely wets and wraps all the reinforcing cores 21 at the cable joint end 2. S6. After the colloid has completely cured, all the reinforcing cores 21 of the cable connector end 2 are firmly fixed in the clamp 22 to form a clamp-type connector end. S7. Separate all reinforcing cores 21 from tensioning elements 12 at the cable connector end.

[0032] Specifically, steps S1 and S2 are pre-processing stages. First, the outer sheath of the cable connector end 2 is peeled off to a predetermined length, exposing all the reinforcing cores 21. The cable connector end 2 is the end section of the cable where the connector needs to be made, and it is the processing object of this method. The outer sheath is the outermost protective structure wrapped around the cable body, used to isolate the internal cable cores and reinforcing cores from external environmental corrosion. The predetermined length is the length of the outer sheath that needs to be peeled off, determined in advance according to the connector specifications and strength requirements. Then, the clamp 22 is fitted onto the outside of all the reinforcing cores 21, leaving sufficient gaps for glue filling, in preparation for subsequent glue filling. The clamp 22 is a ring-shaped mechanical constraint component fitted onto the outside of the reinforcing cores 21. The reserved gap is the space reserved between the inner wall of the clamp 22 and the outer wall of all the reinforcing cores 21, used for glue filling and ensuring that the glue completely covers the reinforcing cores.

[0033] Step S3 is for temporary tensioning preparation. The ends of the scattered reinforcing cores 21 are fixed to the corresponding tensioning members 12 to establish a temporary tensioning connection. In this step, the reinforcing cores 21 are straightened.

[0034] Step S4 involves precise tension adjustment. First, align the cable body with the support 11, ensuring their center lines overlap and their relative positions are fixed to guarantee symmetrical force on each reinforcing core 21. The cable body refers to the main part of the cable excluding the connector end. Then, use a torque wrench to drive each tensioning element 12 to rotate sequentially at a preset torque, gradually and evenly tightening all reinforcing cores 21 until each tensioning element 12 reaches the preset torque value, ensuring consistent tension on each reinforcing core 21.

[0035] Steps S5 and S6 involve potting and curing the adhesive. While maintaining the tension of all reinforcing cores 21, adhesive is poured into the pre-reserved gaps inside the clamp 22, completely impregnating and wrapping each reinforcing core 21. The tension state refers to the stress state of the reinforcing core after it has been stretched to a preset tension. The adhesive is a flowable material that can cure to form a rigid bond, used to fill the gaps between the clamp and the reinforcing cores. Impregnation and wrapping refer to the state where the adhesive completely penetrates the gaps between each reinforcing core 21 and covers the surface of all reinforcing cores 21. After the adhesive has completely cured, the reinforcing cores 21, the adhesive, and the clamp 22 form an inseparable rigid whole, permanently maintaining the tension state. Curing is the physicochemical process of the adhesive changing from a liquid state to a solid rigid body. The clamp-type connector end is a cable connector structure formed by the clamp 22 and the cured adhesive jointly fixing the reinforcing cores 21.

[0036] Step S7 is the final dismantling, which separates the reinforcing core 21 from the temporary tensioning member 12, completing the fabrication of the entire clamp-type connector end.

[0037] Through the above technical solution, on the one hand, by using a torque wrench to drive and controlling the tension of each reinforcing core with a preset torque, the tension can be precisely quantified, ensuring that the tension of each reinforcing core is uniform. Because the reinforcing cores are subjected to uniform force, stress concentration is avoided, making the actual load-bearing capacity of the joint significantly closer to the theoretical value, thus improving the overall strength and reliability of the joint. On the other hand, the entire process of the cable joint end support is based on mechanical operation and quantified parameters (torque value), eliminating reliance on manual experience and ensuring the consistency of joint manufacturing quality. Furthermore, the non-metallic armored cable joint box reinforcing core tensioning device of this invention consists of only a few simple components, is low in cost, small in size, and easy to carry, making it very suitable for on-site construction and rapid repair.

[0038] In this embodiment, the support 11 is an annular support surrounding the preset center line, the tensioning member 12 is connected to the inner wall of the annular support, and the rotation center line of the tensioning member 12 intersects the preset center line perpendicularly.

[0039] Specifically, the annular support is an overall annular structure, such as a circular ring or a regular polygonal ring. The inner wall of the annular support, which faces the hollow area within the ring, is the mounting position for the tensioning element. The rotation center line of the tensioning element 12 is perpendicular to the preset center line, and the two axes intersect at a single point.

[0040] The support 11 is designed as a ring structure, and the center of the ring support is coaxial with the preset center line. Multiple tensioning elements 12 are uniformly fixed on the inner wall of the ring support to constrain the deflection angle of each reinforcing core 21 relative to the preset center line and avoid excessive angle. At the same time, the rotation center line of each tensioning element 12 is made perpendicular to the preset center line. Through the fixed geometric posture, the routing angle of the reinforcing core 21 during wire take-up and wire release is standardized.

[0041] With the above technical solution, the tensioning element is installed on the inner side of the annular support. On the one hand, it limits the deflection angle of the reinforcing core, avoids excessive bending, effectively prevents stress concentration, and protects the reinforcing core structure. On the other hand, the overall structure is compact and occupies little space. In addition, the rotation center line of the tensioning element is perpendicular to the preset center line, the winding and unwinding angles are reasonable and regular, and the line runs smoothly without twisting or deviating.

[0042] In this embodiment, the support 11 includes a first semi-ring portion 111 and a second semi-ring portion 112 located at different positions in the circumferential direction and mating with each other. The ends of the first semi-ring portion 111 and the second semi-ring portion 112 located at one of the mating positions are hinged together, and the ends of the first semi-ring portion 111 and the second semi-ring portion 112 located at the other mating position can be locked and separated.

[0043] Specifically, when the first semi-ring portion 111 is locked with the second semi-ring portion 112, a complete annular support is formed. When the first semi-ring portion 111 and the second semi-ring portion 112 are separated, they can be opened. In this embodiment, the ends of the first semi-ring portion 111 and the second semi-ring portion 112 at one of the mating positions are hinged together by a pin 113, and the ends of the first semi-ring portion 111 and the second semi-ring portion 112 at the other mating position are locked and separated by a snap lock 114.

[0044] Based on the structure of the support described above, in step S3, each reinforcing core 21 at the cable connector end is first connected to multiple tensioning members 12, then all tensioning members 12 are connected to the open annular support, then the annular support is locked, and then step S4 is performed.

[0045] The above technical solution facilitates the connection between the reinforcing core and the tensioning member by first connecting the reinforcing core to the tensioning member and then connecting the tensioning member to the support. On the other hand, since the support is an openable structure, it is convenient to connect the tensioning member to the support.

[0046] In this embodiment, the support 11 is provided with threaded holes corresponding to the tensioning member 12, and the support connection part 121 is an external threaded post, which is screwed into the corresponding threaded hole.

[0047] Specifically, the threaded holes are internal thread mounting holes formed on the support 11, corresponding one-to-one with the number of tensioning members 12. The external threaded post is a columnar structure with threads machined on its outer surface.

[0048] The support connection part 121 of the tensioning member 12 is screwed into the corresponding threaded hole of the support by a threaded engagement method; relying on the thread engagement of the internal and external threads, the tensioning member 12 is positioned and installed on the support 11, the screwing depth is adjusted, and it can be rotatably assembled.

[0049] With the above technical solution, the support connection part is an external threaded column, and no additional connecting parts are needed between the tensioning member and the support. The tensioning member can be installed and rotated by simply screwing it in.

[0050] In this embodiment, the above-mentioned strand connection part 122 is a winding wheel, which is used to wind and temporarily fix the reinforcing core 21.

[0051] Specifically, the winding wheel is a wheel-shaped structure with annular grooves on its outer surface.

[0052] When the tensioner 12 rotates, the reinforcing core 21 is received into the annular groove of the winding wheel. The annular groove can limit the reinforcing core 21, so as to achieve orderly winding and prevent the reinforcing core 21 from falling off.

[0053] With the above technical solution, the strand connection part is a winding wheel with a limiting constraint reinforcement core, which makes it difficult to slip or derail after winding, and the tensioning process is stable.

[0054] In this embodiment, the drive interface 123 is an external hexagon head, and the size of the external hexagon head is adapted to the socket size of a standard torque wrench.

[0055] Specifically, the external hexagonal head is a regular hexagonal columnar structure formed on the outer end of the tensioner 12. The standard torque wrench is a special disassembly and assembly tool with a matching standard socket, used to apply a set torque.

[0056] During operation, the torque wrench sleeve is fitted onto the external hexagon head, and the torque is output through the torque wrench to drive the tensioning component to rotate, thereby realizing the tension adjustment of the reinforcing core.

[0057] With the above technical solution, the drive interface adopts a standard external hexagon, which can be directly adapted to conventional standard torque wrenches on the market without the need for customized special tools.

[0058] In this embodiment, the limiting unit includes a plurality of limiting members 13 corresponding to the plurality of tensioning members 12. Each of the limiting members 13 is installed on the support 11 and restricts the corresponding tensioning member 12 from rotating in the opposite direction to the loosening reinforcing core 21.

[0059] Specifically, the limiting member 13 is an independent unit of the limiting unit, and it corresponds one-to-one with the tensioning member 12. By using the mechanical blocking effect of the limiting member 13, the corresponding tensioning member 12 is constrained to rotate only in the direction of tensioning the reinforcing core, and its rotation in the opposite direction of loosening the reinforcing core is locked, so as to maintain the tension of the reinforcing core and prevent it from rebounding or loosening.

[0060] With the above technical solution, each tensioning component is equipped with its own limiting component, which does not interfere with each other, ensuring precise and reliable positioning. Each limiting component can be independently disassembled and replaced if damaged, eliminating the need for overall disassembly.

[0061] In this embodiment, the anti-reverse part 124 is a ratchet, and the limiting member 13 is a pawl that cooperates with the ratchet. The pawl elastically abuts against the ratchet.

[0062] Specifically, the ratchet is a wheel-shaped structure with teeth on its outer surface. The pawl engages with the teeth to achieve one-way anti-rotation. A return spring provides elastic preload to the pawl, ensuring that the pawl always abuts against the teeth. The pawl, with the help of the elastic force of the return spring, remains elastically pressed against the ratchet.

[0063] When the tensioner 12 rotates in the forward direction, the ratchet can smoothly slide over the pawl without obstructing the forward rotation; when the tensioner 12 has a tendency to rotate in the reverse direction of loosening, the pawl and ratchet engage with each other to lock the tensioner 12 in the reverse rotation, thus achieving the functions of preventing reverse rotation and preventing loosening.

[0064] With the above technical solution, the ratchet and pawl mesh together, allowing only unidirectional rotation and immediate locking in the opposite direction, thus providing a stable anti-reverse effect.

[0065] In this embodiment, the support connection 121, the anti-reverse part 124, the strand connection 122, and the drive interface 123 are arranged sequentially along the axial direction of the tensioner 12.

[0066] Specifically, the four functional structures—support connection 121, anti-reverse part 124, strand connection part 122, and drive interface part 123—are arranged sequentially along the axial direction of the tensioning member 12. Each functional section is independently partitioned in the axial direction and does not interfere with each other, so that the tensioning member 12 can sequentially realize the four functions of support installation, anti-reverse limiting, reinforcing core fixing, and torque drive input on the same columnar part, with a regular and orderly structural layout.

[0067] With the above technical solution, the functional structures are arranged sequentially along the axial direction, without interfering with each other, and each plays its role independently.

[0068] In this embodiment, in step S2, the inner hole of the clamp 22 is a tapered hole, the small end of the tapered hole is clamped on the cable connector end 2, and the large end of the tapered hole faces the same direction as the cable connector end 2 and forms a gap 23 with the reinforcing core 21.

[0069] Specifically, the inner hole is a through hole centered on the clamp 22. The tapered hole has a tapered, gradually changing structure, divided into a small end and a large end. The smaller end of the tapered hole can fit snugly around the outer circumference of the cable connector. The empty space formed between the inner wall of the large end of the tapered hole and the outer wall of the reinforcing core 21 is used for injecting adhesive.

[0070] The inner hole of the clamp 22 is designed as a tapered hole structure; the smaller end of the tapered hole fits and fits against the outside of the cable joint end, serving as a positioning and clamping limit; the larger end of the tapered hole naturally forms an annular gap with the spread reinforcing core; this gap serves as a space for subsequent glue filling, ensuring that the glue can be smoothly poured in, filled and wrapped around the multiple reinforcing cores.

[0071] The above technical solution ensures that the small end of the tapered hole clamps the cable connector, allowing the clamp to automatically align without eccentricity or tilting. The tapered hole naturally creates a gap for the adhesive filling process.

[0072] In this embodiment, in step S2, a sealing ring 24 is also provided between the end of the clamp 22 and the cable body facing the opposite direction and the cable body.

[0073] Specifically, the sealing ring 24 is a sealing component that is set between the end of the clamp 22 and the cable body, and serves as a sealing and isolation component.

[0074] In step S2, a sealing ring is installed between the inner wall of the clamp and the outer wall of the cable at the end of the clamp facing away from the cable connector; the sealing ring fills the gap between the two to achieve a seal between the clamp and the outer periphery of the cable.

[0075] The above solution, by setting a sealing ring, can prevent the internal potting compound from leaking outward, ensuring a full and complete potting molding effect.

[0076] In this embodiment, in step S3, each reinforcing core 21 and strand connection part 122 of the cable connector end 2 are fixed with glue.

[0077] Specifically, the adhesive serves as a bonding medium to secure the reinforcing core 21 to the strand connection portion 122. In step S3, the adhesive is used as a bonding medium to bond each reinforcing core 21 at the cable connector end 2 to the strand connection portion 122 of the tensioning member 12. Through the adhesive effect of the adhesive, each reinforcing core 21 is firmly fixed to its corresponding strand connection portion 122, forming a reliable connection relationship. This provides a stable force transmission basis for the torque wrench to drive the tensioning member 12 to rotate and pull the reinforcing core 21 to tighten.

[0078] Through the above technical solution, the adhesive bonding can make the reinforcing core and the strand connection part fit together and solidify, ensuring stable force transmission and preventing slippage during the tensioning process.

[0079] The following describes a method for making an aramid cable splice, with the specific steps as follows: Preparation: Take a section of aramid cable, peel off its outer sheath to expose the internal multi-strand aramid reinforcing ribs. Place a cylindrical clamp on the end of the aramid cable and push it into place.

[0080] Winding Aramid: The 6 strands of aramid reinforcing ribs of the aramid cable are evenly separated and wound one by one onto the strand connection part of the tensioning member. A small amount of cyanoacrylate glue is used for temporary fixation to prevent loosening in subsequent operations.

[0081] Installation and pretensioning: Place the support on a stable platform. Align the tensioner with the aramid yarn wound around the threaded hole on the support and screw it in by hand until you feel all the aramid yarn strands are slightly taut.

[0082] Applying force evenly: Using a torque wrench with a preset torque of 20 N·m, clamp the hexagonal head of the tensioner and rotate it clockwise. When the preset torque is reached, the torque wrench will make a "click" sound; at this point, stop rotating. This step ensures that each aramid reinforcing rib receives an equal and constant tension.

[0083] Glue application and curing: While keeping the device taut, slowly inject the prepared high-strength epoxy resin into the glue application area of ​​the clamp until all gaps between the aramid strands are completely filled. Allow to stand for 24 hours to allow the glue to fully cure, thus completing the fixation of the aramid.

[0084] The joints made using the above method, when subjected to tensile testing, showed a breaking strength that was more than 30% higher than that of traditionally handmade joints. Furthermore, when the joints broke, the strands of aramid fibers broke almost simultaneously, demonstrating the uniformity of the stress distribution.

[0085] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A tensioning device for the reinforcing core of a non-metallic armored cable splice box, characterized in that, It includes a support, a tensioning unit, and a limiting unit. The tensioning unit and the limiting unit are both installed on the support. The tensioning unit includes a plurality of tensioning members evenly distributed around a preset center line. Each tensioning member is a columnar member, including a support connection part, a strand connection part, a drive interface part, and an anti-reverse part located at different positions in its axial direction. The support connection part is rotatably connected to the support around the central axis of the columnar member; The strand connection portion is adapted to be fixedly connected to the end of the reinforcing core; The drive interface is adapted to be connected to a torque wrench, thereby driving each tensioning member to rotate in the forward direction through the torque wrench. When the tensioning member rotates in the forward direction under the drive of the torque wrench with a preset torque, the tension of the connected reinforcing core is adjusted. The anti-reverse rotation part cooperates with the limiting unit, thereby limiting the reverse rotation of the tensioning member towards the loosening reinforcing core through the limiting unit; Wherein, the support is an annular support surrounding the preset center line, the tensioning member is connected to the inner side wall of the annular support, and the rotation center line of the tensioning member intersects the preset center line perpendicularly. In use, first peel off the outer sheath of the cable connector end by a predetermined length to expose all the reinforcing cores of the cable connector end; then, put a clamp on the outside of the cable connector end, leaving a gap between the clamp and the cable connector end; then, separate each reinforcing core of the cable connector end and fix it to the multiple tensioning members respectively; next, align the central axis of the cable body with the predetermined center line and keep the relative position between the cable body and the support unchanged, and drive the multiple tensioning members connected to the support to rotate in sequence with a torque wrench at a predetermined torque, thereby gradually tightening the reinforcing cores of the cable connector end until the torque wrench reaches the predetermined torque.

2. The non-metallic armored cable splice box reinforcing core tensioning device according to claim 1, characterized in that, The support includes a first semi-ring portion and a second semi-ring portion located at different positions in its circumference. The first semi-ring portion and the second semi-ring portion are hingedly connected between their ends at one of the mating positions, and the first semi-ring portion and the second semi-ring portion are lockable and separable between their ends at the other mating position.

3. The non-metallic armored cable splice box reinforcing core tensioning device according to claim 1, characterized in that, The support is provided with threaded holes that correspond one-to-one with the tensioning member, and the support connection part is an external threaded post, which is screwed into the corresponding threaded hole.

4. The non-metallic armored cable splice box reinforcing core tensioning device according to claim 1, characterized in that, The strand connection part is a winding wheel, which is used to wind and temporarily fix the reinforcing core.

5. The non-metallic armored cable splice box reinforcing core tensioning device according to claim 1, characterized in that, The drive interface is an external hexagonal head, and the size of the external hexagonal head is adapted to the socket size of a standard torque wrench.

6. The non-metallic armored cable splice box reinforcing core tensioning device according to claim 1, characterized in that, The limiting unit includes multiple limiting members that correspond one-to-one with the multiple tensioning members. Each limiting member is installed on the support and restricts the corresponding tensioning member from rotating in the opposite direction to the loosening reinforcing core.

7. The non-metallic armored cable splice box reinforcing core tensioning device according to claim 6, characterized in that, The anti-reverse part is a ratchet, and the limiting member is a pawl that cooperates with the ratchet, with the pawl elastically abutting against the ratchet.

8. A method for manufacturing a non-metallic armored cable junction box, characterized in that, The non-metallic armored cable splice box reinforcing core tensioning device according to any one of claims 1 to 7, wherein the manufacturing method of the non-metallic armored cable splice box includes the following steps: S1. Peel off the outer sheath of the cable connector end by a predetermined length to expose all the reinforcing cores of the cable connector end; S2. Place a clamp on the outside of the cable joint end, and leave a gap between the clamp and the cable joint end. S3. Separate the reinforcing cores at the cable connector end and fix them to the multiple tensioning members respectively; S4. Align the central axis of the cable body with the preset center line and keep the relative position between the cable body and the support unchanged. Use a torque wrench to drive multiple tensioning members connected to the support to rotate in sequence with a preset torque, thereby gradually tightening the reinforcing core at the cable joint end until the torque wrench reaches the preset torque. S5. Keep the tension of the multi-strand reinforcing core at the cable joint end unchanged, and inject colloid into the inside of the clamp to ensure that the colloid completely wets and wraps all the reinforcing cores at the cable joint end. S6. After the colloid has completely cured, all the reinforcing cores at the cable joint end are firmly fixed in the clamp, forming a clamp-type joint end. S7. Separate all reinforcing cores from the tensioning components at the cable connector end.

9. The method for manufacturing a non-metallic armored cable junction box according to claim 8, characterized in that, In step S2, the inner hole of the clamp is a tapered hole, the small end of the tapered hole is clamped to the cable joint end, and the large end of the tapered hole faces the same direction as the cable joint end and forms a gap with the reinforcing core.

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