An overhead conductor terminal fitting and a processing method thereof

Abstract

This application discloses a splicing fitting for overhead conductors and its processing method, relating to the technical field of overhead transmission line fittings. It includes a splicing tube and a torque bolt. The splicing tube has a locking hole, and the torque bolt is screwed into the locking hole. The torque bolt includes a rod, a head, and a frustum-shaped connecting part. A sleeve with external threads is provided outside the locking hole, and the sleeve is fitted onto the outside of the end of the rod. The top surface of the head has a first threaded hole, and a glue storage bag is provided inside the first threaded hole. After the torque bolt breaks, the head is screwed onto the outside of the sleeve through the first threaded hole, and the sleeve punctures the glue storage bag, allowing glue to fill the inside of the sleeve and seal the locking hole. This application, by utilizing the head to screw onto the sleeve after the torque bolt breaks and releasing the glue to solidify and lock it in place, effectively prevents the rod of the torque bolt from loosening and falling off under long-term wind vibration conditions, thus improving the connection reliability of the splicing fitting.

Description

Technical Field

[0001] This application relates to the field of overhead transmission line fittings technology, specifically to a splicing fitting for overhead conductors and its processing method. Background Technology

[0002] In the construction of overhead transmission lines, splicing fittings are key components for achieving electrical and mechanical connections between two conductors. Their function is to reliably connect broken or segmented conductor ends, ensuring continuous current conduction and sufficient tensile strength. Torque splice tubes are one type of splicing fitting, widely used in line construction due to their ease of installation and the absence of specialized hydraulic equipment.

[0003] The basic structure of a torque splice is as follows: Locking holes are pre-drilled at both ends or inside a section of metal circular pipe, which is then used with constant torque shear head bolts. During installation, both ends of the wire are inserted into the ends of the splice, and the bolts are tightened. When the bolt tightening torque reaches the set value, the shear groove between the bolt head and the shank breaks, and the bolt head falls off. At this point, the required clamping force is achieved. No hydraulic crimping equipment is needed, simplifying the on-site construction process, making it particularly suitable for outdoor high-altitude work environments.

[0004] However, overhead conductors exposed to wind outdoors will experience continuous low-frequency oscillations and vibrations. Over a long period of time, the constant torque shear head bolts are prone to loosening or even falling off completely, resulting in a decrease in connection reliability. Summary of the Invention

[0005] To overcome the problems existing in the prior art, this application provides a splicing fitting for overhead conductors, which is implemented by the following technical solution: A splicing fitting for overhead conductors includes a splicing tube and a torque bolt. The splicing tube is provided with a plurality of locking holes. The torque bolt is adapted to be screwed into the locking holes and locks the cable inserted in the splicing tube. The torque bolt includes a rod, a head, and a connecting part. The connecting part is frustum-shaped and is used to connect the rod and the head. Each of the locking holes is provided with a sleeve with external threads on the outside. The sleeve is connected to the connecting tube and is sleeved on the outside of the end of the rod. The side of the head that is not connected to the connecting part is provided with a first threaded hole and a glue storage bag is provided in the first threaded hole. After the torque bolt breaks, the head can be screwed onto the outside of the sleeve through the first threaded hole. The sleeve punctures the glue storage bag, and the glue in the glue storage bag fills the inside of the sleeve and seals the locking hole.

[0006] Optionally, each end of the inner side of the splicing tube is provided with a wire insertion space for inserting the cable to be spliced. Each locking hole is provided with a torque bolt screwed in by a thread, and each wire insertion space is provided with at least two torque bolts. The locking holes communicating with the same wire insertion space are staggered.

[0007] Optionally, a second threaded hole is provided on the side of the head that is not connected to the connecting part. The second threaded hole is coaxially arranged with the first threaded hole and communicates with it. The inner diameter of the second threaded hole is larger than the inner diameter of the first threaded hole, and the second threaded hole is far away from the connecting part. A cover plate is screwed into the second threaded hole to seal the storage bag.

[0008] Optionally, the cover plate is provided with a plurality of perforations for venting and rotating the cover plate.

[0009] Optionally, a vent hole is provided on one side of the head and the connecting part, and the vent hole communicates with the first threaded hole; When the head is screwed onto the sleeve, the vent is positioned upwards and used to discharge gas from the inside of the sleeve and the head.

[0010] Optionally, a pull rod is provided inside the vent hole, one end of the pull rod is located outside the head, and the other end of the pull rod is connected to the glue storage bag. The pull rod is used to pull the glue in the storage bag out of the vent hole.

[0011] Optionally, the vent hole is provided with a flared opening on the side near the storage bag, and the inner diameter of the flared opening gradually increases in the direction away from the vent hole.

[0012] Optionally, the bottom of the first threaded hole is further provided with a plurality of grooves, all of which are connected to the vent hole. The plurality of grooves extend outward from the vent hole in a divergent manner, and the grooves are used to cut the storage bag.

[0013] This application also discloses a method for processing splicing fittings for overhead conductors, which is achieved using the following technical solution: A method for processing splicing fittings for overhead conductors includes the following steps: Step 1: Insert the ends of the two cables to be spliced ​​into the splice space from both ends of the splice tube; Step 2: Screw the torque bolt into the locking hole and tighten the torque bolt with a torque wrench. When the tightening torque reaches the set value, the connection will break at the shear groove and the head will separate from the rod. Step 3: Remove the broken end of the cable, unscrew the cover plate to expose the rubber storage bag inside the first threaded hole; Step 4: Align the first threaded hole with the sleeve outside the locking hole, and adjust the head angle so that the vent hole faces upward; Step 5: Rotate the head to engage the first threaded hole with the external thread of the sleeve, and the sleeve will gradually enter the first threaded hole; Step 6: The end of the sleeve contacts and punctures the storage bag, and the groove assists in cutting the bag, releasing the adhesive from the storage bag; Step 7: Pull the lever to remove the empty storage bag from the vent and clear it; Step 8: Repeat the above steps to complete the secondary locking after all torque bolts on the splice pipe have broken.

[0014] Compared with the prior art, this application has the following advantages: 1. After the torque bolt breaks, the operator screws the broken head through the first threaded hole onto the outside of the sleeve. The sleeve punctures the rubber storage bag, allowing the rubber to flow out and fill the inside of the sleeve to seal the locking hole. After the rubber cures, it forms an adhesive locking layer, which effectively prevents the rod from loosening or falling off under long-term vibration, and improves the connection reliability of the splicing hardware in wind-induced vibration environment.

[0015] 2. By using the originally broken and detached head as a secondary locking component, and by screwing it back onto the outside of the sleeve, both the anti-loosening function is achieved, and the safety risks caused by the scattering of the discarded head are avoided, simplifying the on-site operation process.

[0016] 3. The operator only needs to align the broken end with the sleeve and screw it in; no special tools or complicated operations are required. The vent hole automatically releases internal gas during the screwing process, ensuring smooth flow and filling of the adhesive. The perforations on the cover plate serve as both a point of rotation and a venting channel, preventing the storage bag from accidentally falling off and ensuring sufficient strength of the end. Attached Figure Description

[0017] Figure 1 This is a schematic perspective view of this application; Figure 2 This is a reference diagram of the explosion state of this application; Figure 3 It is a schematic 3D diagram of the splicing pipe; Figure 4 This is a schematic 3D diagram of a torque bolt; Figure 5 This is a cross-sectional view of the internal structure of this application; In the diagram: 1. Connecting tube; 11. Locking hole; 12. Insertion space; 2. Torque bolt; 21. Rod; 22. Head; 221. First threaded hole; 222. Glue storage bag; 223. Second threaded hole; 224. Cover plate; 2240. Through hole; 225. Vent hole; 226. Pull rod; 227. Flared mouth; 228. Groove; 23. Connecting part; 3. Sleeve. Detailed Implementation

[0018] The present application will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0019] like Figure 1-5 As shown, this embodiment provides a splicing fitting for overhead conductors.

[0020] A splicing fitting for overhead conductors includes a splicing tube 1 and torque bolts 2. The splicing tube 1 has several locking holes 11, and each end of the inner side of the splicing tube 1 has a insertion space 12 for inserting the cable to be spliced. Each locking hole 11 is threaded with a torque bolt 2, and each insertion space 12 has at least two torque bolts 2. The locking holes 11 communicating with the same insertion space 12 are staggered. The staggered arrangement allows multiple torque bolts 2 to press the cable from different directions, resulting in a more uniform distribution of pressing force and avoiding stress concentration on the same cross section. At the same time, multi-point pressing effectively increases the contact area between the cable and the splicing tube 1, reduces contact resistance, and ensures the reliability of the electrical connection.

[0021] The torque bolt 2 includes a shank 21, a head 22, and a connecting portion 23. The connecting portion 23 is frustoconical and connects the shank 21 and the head 22. The shank 21 has external threads that mate with the internal threads of the locking hole 11. The connecting portion 23 is the weakest point of the torque bolt 2, with its smallest cross-section being the shear groove. When the tightening torque reaches the set value, the connecting portion 23 breaks off at the shear groove, and the head 22 separates from the shank 21.

[0022] Each locking hole 11 has a threaded sleeve 3 on its outer side, which is connected to the connecting tube 1 (the two can be integrally formed or welded together). The sleeve 3 is fitted onto the outer side of the end of the rod 21, that is, the rod 21 passes through the sleeve 3 and is screwed into the locking hole 11. The side of the head 22 that is not connected to the connecting part 23 (i.e., the top surface of the head 22) is provided with a first threaded hole 221, and a glue storage bag 222 is provided inside the first threaded hole 221. The glue storage bag 222 is sealed with a curable colloid such as anaerobic glue or epoxy resin.

[0023] After the torque bolt 2 breaks, the operator removes the detached head 22, aligns the first threaded hole 221 with the external thread of the sleeve 3, and rotates the head 22 to engage the first threaded hole 221 with the sleeve 3. This involves flipping the head 22 so that the first threaded hole on the head 22 aligns with the sleeve 3. During engagement, the sleeve 3 gradually enters the hole of the first thread 221. When the end of the sleeve 3 contacts the rubber storage bag 222, it continues to be screwed in until the sleeve 3 punctures the rubber storage bag 222. After the rubber storage bag 222 ruptures, the rubber is released from the bag, flows along the gap between the outer wall of the sleeve 3 and the inner wall of the first threaded hole 221, and enters the inside of the sleeve 3. The rubber eventually fills the gap between the locking hole 11 and the rod 21, as well as the threaded engagement area. After the rubber cures, it bonds the rod 21, sleeve 3, head 22, and connecting tube 1 together, preventing the rod 21 from loosening or falling off under long-term vibration.

[0024] In this embodiment, after the torque bolt 2 breaks, the previously discarded head 22 is used for secondary locking, achieving a dual anti-loosening effect. The first layer of anti-loosening is the thread self-locking between the rod 21 and the locking hole 11 after the torque bolt 2 breaks. The second layer of anti-loosening is the adhesive locking formed after the colloid cures. The colloid fills the tiny gaps in the thread engagement area, eliminating the relative movement space between the threaded pairs. Even if the overhead conductor experiences continuous low-frequency swaying and vibration under wind force, the rod 21 cannot rotate relative to the locking hole 11, thus effectively preventing loosening or detachment. At the same time, screwing the discarded head 22 back to the outside of the sleeve 3 avoids the safety risk of the head 22 falling from a height and also reduces the scattering of parts at the construction site.

[0025] Furthermore, a second threaded hole 223 is provided on the side of the head 22 that is not connected to the connecting part 23. The second threaded hole 223 is coaxially arranged with and communicates with the first threaded hole 221, and the inner diameter of the second threaded hole 223 is larger than the inner diameter of the first threaded hole 221. The second threaded hole 223 is located away from the connecting part 23, that is, the second threaded hole 223 is located at the outer opening on the top surface of the head 22, while the first threaded hole 221 is located on the inner side close to the connecting part 23.

[0026] A cover plate 224 is screwed into the second threaded hole 223 to seal the storage bag 222. During transportation and storage, the cover plate 224 prevents accidental damage to the storage bag 222, thus preventing leakage of the adhesive and ensuring the product's storage stability. In use, the operator first unscrews the cover plate 224 to expose the storage bag 222, and then screws the head 22 onto the sleeve 3. The cover plate 224 is reusable and can be tightened before storage. The storage bag 222 can be fixed to the inside of the head 22 by adhesive bonding or by an interference fit with the first threaded hole 221, ensuring it does not fall off during the rotation of the head 22.

[0027] The cover plate 224 has several perforations 2240 for venting and rotating the cover plate 224. Operators can insert tools (such as needle-nose pliers or a special wrench) into the perforations 2240 to rotate the cover plate 224 for easy installation and removal. At the same time, the perforations 2240 can also serve as venting and observation channels. That is, by observing whether there is any glue overflowing from the perforations 2240, it can be determined whether the glue storage bag 222 is damaged, preventing the discovery that the glue storage bag 222 has been ruptured and the glue has solidified only after the torque bolt 2 has broken.

[0028] A vent 225 is provided on one side of the head 22 and the connecting part 23, and the vent 225 communicates with the first threaded hole 221. When the head 22 is screwed onto the sleeve 3, the vent 225 is positioned upwards to discharge gas from the sleeve 3 and the inside of the head 22. Before screwing onto the connecting part 22, the operator should adjust the vent 225 to face upwards so that the compressed gas during the screwing process can escape smoothly from the vent 225. The vent 225 also facilitates the operator's observation of the flow of the colloid—when a small amount of colloid overflows from the vent 225, it indicates that the colloid has filled to the height of the vent 225 and the internal gaps have been fully filled.

[0029] A pull rod 226 is installed inside the vent 225. One end of the pull rod 226 is located outside the head 22, and the other end is connected to the storage bag 222. The pull rod 226 is used to pull the storage bag 222 out of the vent 225. After the glue is filled, the operator pulls the pull rod 226 to pull out the punctured empty storage bag 222 from the vent 225 and remove it. This removes residual bag material, preventing bag fragments from remaining in the thread gaps and affecting the glue distribution or forming weak interfaces. The pulling action of the pull rod 226 can also generate negative pressure to help expel tiny air bubbles remaining in the thread gaps, improving the density of the glue filling. At the same time, by observing whether there is glue on the pull rod 226, it can be determined whether the storage bag 222 has been completely punctured, ensuring the reliability of the second layer of anti-loosening effect after the storage bag 222 is ruptured and the glue filling is cured.

[0030] The vent 225 has a flared opening 227 on the side near the storage bag 222, with the inner diameter of the flared opening 227 gradually increasing away from the vent 225. The flared opening 227 facilitates the flow of the adhesive towards the vent 225 after the storage bag 222 ruptures, while also increasing the venting cross-sectional area and improving venting efficiency. When the pull rod 226 pulls the storage bag 222, the flared opening 227 guides and closes the bag, allowing it to pass smoothly through the vent 225 and preventing the bag from getting stuck at the inlet of the vent 225.

[0031] The bottom of the first threaded hole 221 is also provided with several grooves 228, all of which are connected to the vent hole 225. These grooves 228 extend outwards from the vent hole 225 in a radiating pattern, and are used to cut the storage bag 222. When the sleeve 3 enters the first threaded hole 221 and squeezes the storage bag 222, the storage bag 222 is pressed into the grooves 228. The sharp edges of the grooves 228 puncture the bag, releasing the adhesive. The radiating arrangement of the grooves 228 increases the cutting area, ensuring that the storage bag 222 is fully punctured and the adhesive is completely released. Simultaneously, the grooves 228 act as guide channels for the adhesive, guiding it to be evenly distributed throughout the first threaded hole 221, preventing uneven filling due to localized adhesive accumulation. The connection between the grooves 228 and the vent hole 225 also allows the gas expelled by the adhesive to flow along the grooves 228 into the vent hole 225 for discharge, and also facilitates the extraction of the storage bag 222.

[0032] This embodiment also discloses a method for processing splicing fittings for overhead conductors.

[0033] A method for processing splicing fittings for overhead conductors includes the following steps: Step 1: Insert the ends of the two cables to be connected into the insertion space 12 from both ends of the splicing tube 1; Step 2: Screw the torque bolt 2 into the locking hole 11 and tighten the torque bolt 2 with a torque wrench. When the tightening torque reaches the set value, the connecting part 23 breaks at the shear groove and the head 22 separates from the rod part 21. Step 3: Remove the broken end 22 of the cable, unscrew the cover plate 224 to expose the glue storage bag 222 inside the first threaded hole 221; Step 4: Align the first threaded hole with the sleeve 3 outside the locking hole 11, and adjust the angle of the head 22 so that the vent hole 225 faces upward; Step 5: Rotate the head 22 to engage the first threaded hole 221 with the external thread of the sleeve 3, and the sleeve 3 gradually enters the first threaded hole; Step 6: The end of the sleeve 3 contacts and punctures the storage bag 222, and the groove 228 assists in cutting the bag body, releasing the adhesive from the storage bag 222; Step 7: Pull the lever 226 to remove the empty storage bag 222 from the vent 225; Step 8: Repeat the above steps to complete the secondary locking after all torque bolts 2 on the splice pipe 1 have broken.

[0034] The above embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of protection of this application. Any non-substantial changes and substitutions made by those skilled in the art based on this application shall fall within the scope of protection claimed by this application.

Claims

1. A splicing fitting for overhead conductors, comprising a splicing tube (1) and a torque bolt (2), wherein the splicing tube (1) is provided with a plurality of locking holes (11), and the torque bolt (2) is adapted to be screwed into the locking holes (11) and locks the cable inserted into the splicing tube (1), characterized in that, The torque bolt (2) includes a rod (21), a head (22) and a connecting part (23). The connecting part (23) is frustum-shaped and is used to connect the rod (21) and the head (22). Each of the locking holes (11) is provided with a sleeve (3) with external threads on the outside. The sleeve (3) is connected to the connecting tube (1). The sleeve (3) is sleeved on the outside of the end of the rod (21). The head (22) is provided with a first threaded hole (221) on the side not connected to the connecting part (23). A glue storage bag (222) is provided in the first threaded hole. After the torque bolt (2) breaks, the head (22) can be screwed onto the outside of the sleeve (3) through the first threaded hole (221). The sleeve (3) punctures the glue storage bag (222), and the glue in the glue storage bag (222) fills the inside of the sleeve (3) and seals the locking hole (11).

2. The overhead conductor splicing fitting according to claim 1, characterized in that, Both ends of the inner side of the splice tube (1) are provided with a wire insertion space (12). The wire insertion space (12) is used to insert the cable to be spliced. Each locking hole (11) is provided with a torque bolt (2) screwed in by a thread. Each wire insertion space (12) is provided with at least two torque bolts (2). Several locking holes (11) communicating with the same wire insertion space (12) are staggered.

3. The overhead conductor splicing fitting according to claim 1, characterized in that, The head (22) is provided with a second threaded hole (223) on the side not connected to the connecting part (23). The second threaded hole (223) is coaxially arranged with the first threaded hole (221) and communicates with each other. The inner diameter of the second threaded hole (223) is larger than the inner diameter of the first threaded hole (221). The second threaded hole (223) is far away from the connecting part (23). A cover plate (224) is adapted to be screwed into the second threaded hole (223), and the cover plate (224) is used to seal the storage bag (222).

4. A splicing fitting for overhead conductors according to claim 2, characterized in that, The cover plate (224) is provided with a plurality of perforations (2240), which are used for venting and rotating the cover plate (224).

5. A splicing fitting for overhead conductors according to claim 2, characterized in that, The head (22) and the connecting part (23) are provided with an exhaust hole (225) on one side, and the exhaust hole (225) is connected to the first threaded hole (221); When the head (22) is screwed into the sleeve (3), the vent (225) is set upward and used to discharge the gas inside the sleeve (3) and the head (22).

6. A splicing fitting for overhead conductors according to claim 5, characterized in that, A pull rod (226) is provided inside the vent (225). One end of the pull rod (226) is located outside the head (22), and the other end of the pull rod (226) is connected to the storage bag (222). The pull rod (226) is used to pull the storage bag glue out of the vent (225).

7. A splicing fitting for overhead conductors according to claim 6, characterized in that, The vent (225) is provided with a flared opening (227) on the side near the storage bag (222), and the inner diameter of the flared opening (227) gradually increases in the direction away from the vent (225).

8. A splicing fitting for overhead conductors according to claim 6, characterized in that, The bottom of the first threaded hole (221) is also provided with a plurality of grooves (228), all of which are connected to the vent hole (225). The plurality of grooves (228) extend outward from the vent hole (225) in a divergent manner. The grooves (228) are used to cut the storage bag (222).

9. A method for processing a splicing fitting for overhead conductors as described in claim 6, characterized in that, Includes the following steps: Step 1: Insert the ends of the two cables to be connected into the insertion space (12) from both ends of the splicing tube (1); Step 2: Screw the torque bolt (2) into the locking hole (11) and tighten the torque bolt (2) with a torque wrench. When the tightening torque reaches the set value, the connecting part (23) breaks at the shear groove and the head (22) separates from the rod part (21). Step 3: Remove the broken end of the cable (22), unscrew the cover plate (224) to expose the rubber storage bag (222) inside the first threaded hole (221); Step 4: Align the first threaded hole (221) with the sleeve (3) outside the locking hole (11), and adjust the head (22) angle so that the vent hole (225) faces upward; Step 5: Rotate the head (22) to engage the first threaded hole (221) with the external thread of the sleeve (3), and the sleeve (3) gradually enters the first threaded hole (221); Step 6: The end of the sleeve (3) contacts and punctures the storage bag (222), the groove (228) assists in cutting the bag body, and the glue is released from the storage bag (222); Step 7: Pull the lever (226) to remove the empty storage bag (222) from the vent (225); Step 8: Repeat the above steps to complete the secondary locking of all torque bolts (2) on the splice pipe (1) after breakage.

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