Large-section cable connector

Abstract

The invention relates to the technical field of cable connection, and discloses a large-section cable connector, which comprises two groups of cable conductors, the butt joint of the two groups of cable conductors is sleeved with a pouring and welding shell, the inner space of the pouring and welding shell is a liquid filling cavity, and the liquid filling cavity is filled with tin-copper alloy molten liquid. The inner wall of the casting and welding shell is movably provided with an exhaust assembly used for exhausting redundant air except the tin-copper alloy molten liquid in the liquid filling cavity. According to the equipment, through a casting welding shell, a pressing barrel, an adjusting rod, a feeding hollow pipe of a bidirectional one-way valve and tin-copper alloy melt, a closed liquid filling cavity is formed by the pressing barrel and the casting welding shell, and then the pressing barrel is driven by the adjusting rod to compress the cavity, so that air and redundant melt are discharged through the feeding hollow pipe, and bubbles of a welding block are eliminated; and the butt joint gap of the cable conductor is filled with the melt by utilizing the fluidity of the melt, and a tight welding block is formed after solidification. Ionization sparks caused by butt joint gaps are avoided due to the dual effects, and the power-on reliability of the large-section cable is improved.

Description

Technical Field

[0001] This invention relates to the field of cable connection technology, and more particularly to large cross-section cable connectors. Background Technology

[0002] As the core development direction of modern power systems, the stability of power transmission in smart grids relies on the support of cables and related connecting components. In smart grid power transmission systems, universal accessories are fundamental to ensuring the compatible operation of equipment and transmission carriers, with cable connectors being a widely used core universal accessory. Cables need to be laid in sections, and cable connectors (also known as cable heads) are key components for achieving line continuity. The connector that connects two cable sections in the middle is called an intermediate connector, and the connectors at both ends that connect to equipment are called terminal heads. These connectors not only lock and fix the incoming and outgoing lines but also provide waterproofing, dustproofing, and vibration protection, ensuring the reliable operation of smart grids. Existing large-section cable connectors are mainly torque-connecting conduits, typically made of high-strength metals such as copper alloys and aluminum alloys, with internal... With a specific threaded structure or groove, the coupling tube is installed by applying a preset torque using a special torque tool, causing the coupling tube to tightly engage and deform around the cable conductor, thus forming a robust electrical and mechanical connection. It is widely used in high-voltage transmission lines to achieve stable current transmission in large-section cables. However, traditional torque coupling tubes rely solely on bolts to connect the conductors at both ends. In practical applications, gaps often exist at the connection due to inconsistent conductor thicknesses. When current passes through, the high resistance of the gap easily generates heat, and the air is ionized under the influence of the electric field, forming electric sparks. These electric sparks can burn the surface of the cable conductor and the coupling tube, increasing contact resistance, which may lead to overheating, aging, or even ignition of the cable insulation layer. This technical bottleneck has become a key factor restricting the reliability of large-section metal conductor connections.

[0003] Therefore, it is necessary to propose large-section cable connectors to solve the above problems. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that the existing technology has the disadvantage that when the cable is energized, ionization sparks may be generated due to the gap and thickness difference of the conductors at the joint, which will affect the reliability of the energization. To this end, we propose a large cross-section cable connector.

[0005] To achieve the above objectives, this application adopts the following technical solution: a large-section cable connector, comprising two sets of cable conductors, with a casting shell fitted at the joint of the two sets of cable conductors. The internal space of the casting shell is a filling chamber filled with molten tin-copper alloy. An exhaust assembly for removing excess air from the filling chamber, excluding the molten tin-copper alloy, is movably installed on the inner wall of the casting shell. The exhaust assembly further comprises pressure cylinders symmetrically slidably installed at both ends of the inner wall of the casting shell and movable towards each other. The two pressure cylinders and the inner wall space of the casting shell together form a relatively sealed filling chamber. A pre-tightening component for pre-tightening the cable conductors is movably installed at the end of the pressure cylinder away from the joint of the two sets of cable conductors. A sealing ring is sealed and engaged on the inner wall of the end of the pressure cylinder near the joint of the two sets of cable conductors. The surface of the sealing ring near the pre-tightening component... A circular through hole for cable conductors of different thicknesses to pass through is provided at the center of the sealing ring; the welded shell includes an upper shell and a lower shell, which are joined together by dovetail grooves and dovetails of corresponding sizes. Two sets of feed hollow tubes are symmetrically threaded on the upper surface of the upper shell; both sets of feed hollow tubes are T-shaped and have hollow cavities. Multiple sets of hollow grooves are opened at equal angles around the axis at the bottom of the feed hollow tubes. The internal space of the feed hollow tubes is connected to the filling chamber. One-way valves are installed on the inner walls of the hollow cavities of both sets of feed hollow tubes, and the opening and closing directions of the one-way valves of the two sets of feed hollow tubes are opposite; an adjusting rod is rotatably connected to one side of the outer wall of the lower shell. The outer walls of both ends of the adjusting rod have threads in opposite directions, and the threads at both ends of the adjusting rod are respectively connected to the threads of the pressure cylinder at the corresponding positions.

[0006] Preferably, the outer wall of the end of the pressure cylinder away from the pre-tightening component is fixed with multiple sets of smooth protrusions at equal angles around the axis. The protrusions are slidably connected to the upper shell and the lower shell respectively, and the upper shell and the lower shell are provided with limiting grooves of matching size and shape at the contact positions with the protrusions.

[0007] Preferably, the sealing ring is made entirely of high-temperature resistant elastic silicone, and the sealing ring is elastically fitted to the outer wall of the cable conductor, and the surface of the circular through hole near the pre-tightening component is concave in a conical shape.

[0008] Preferably, one end of the adjusting rod is fixed with a torsion head, and the two ends of the adjusting rod respectively pass through pressure cylinders at corresponding positions. The pressure cylinders have threaded holes with matching dimensions and thread orientations at the contact positions with the adjusting rod.

[0009] Preferably, a first groove is formed at the center of the top surface of the feed hollow tube, and a second groove is formed at the center of the first groove, with the first and second grooves forming a descending stepped shape.

[0010] Preferably, the inner wall of the first groove is hexagonal, the inner wall of the second groove is circular, and the inner wall of the second groove is threaded. The outer wall of the feed hollow tube is threaded, and the inner spaces of the first and second grooves are connected to the hollow cavity.

[0011] Preferably, the tubular outer wall of the feed hollow tube is threaded to the upper shell, and a recessed through hole of matching size and shape is provided at the contact position between the upper shell and the feed hollow tube.

[0012] Preferably, the pre-tightening component includes a worm gear rotatably connected to one end surface of the pressure cylinder, and the center line of the worm gear coincides with the axis of the pressure cylinder and the welded housing. A worm is rotatably connected to one end of the outer wall of the pressure cylinder above the worm gear, and one end of the worm penetrates the outer wall of the pressure cylinder and is fixed with a torsion block.

[0013] Preferably, the worm gear is annular in shape, and the inner sidewall of the worm gear is provided with an internal gear ring at equal angles around the axis. Multiple sets of clamping arms are rotatably mounted on the outer wall of one end of the pressure cylinder at equal angles around the axis. A gear is fixed at the axial position of one side of the outer wall of each set of clamping arms, and the gear meshes with the internal gear ring.

[0014] Preferably, an observation window is installed at the center of the upper surface of the upper housing, a handle is fixed to the upper surface of the upper housing, a locking plate is embedded in one side wall of both the upper and lower housings, and a locking groove of matching size and shape is opened at the contact position between the upper and lower housings and the locking plate.

[0015] The technical effects and advantages of this invention are as follows: In this invention, the equipment uses a cast-in-place shell, a pressure cylinder, an adjusting rod, a feed hollow tube with a two-way one-way valve, and molten tin-copper alloy. First, the pressure cylinder and the cast-in-place shell form a sealed filling chamber. Then, the adjusting rod drives the pressure cylinder to compress the chamber. This process both expels air and excess molten liquid through the feed hollow tube, eliminating air bubbles in the weld block, and utilizes the fluidity of the molten liquid to fill the gap between the cable conductors, forming a tight weld block after solidification. This dual effect avoids ionizing sparks caused by gaps in the weld, improving the reliability of large-section cables. Furthermore, this invention utilizes a high-temperature resistant elastic silicone sealing ring, a worm gear and worm wheel in the pre-tightening components, and multiple sets of clamping arms. The sealing ring elastically fits cable conductors of different thicknesses to ensure airtightness. The worm gear drives the worm wheel to move the clamping arms to gather and fix the cable conductors, preventing them from shaking and creating gaps. This specifically solves the gap problem caused by differences in cable thickness and unstable welds, reducing the generation of ionizing sparks and ensuring stable power transmission. Attached Figure Description

[0016] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts: Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 This is a partial cross-sectional view of the present invention; Figure 3 This is a cross-sectional view of the upper shell and its internal structure of the present invention; Figure 4 This is a schematic diagram showing the disassembled structure of the exhaust assembly of the present invention; Figure 5 This is a schematic diagram of the upper housing, lower housing, locking plate, and locking groove structure of the present invention; Figure 6 This is a schematic diagram of the limiting groove structure of the present invention; Figure 7 This is a schematic diagram of the welded housing and pre-fastening components of the present invention; Figure 8 This is a front view schematic diagram of the pre-fastening component structure of the present invention; Figure 9 This is a schematic diagram of the sealing ring structure of the present invention; Figure 10 This is a cross-sectional schematic diagram of the pressure cylinder structure of the present invention; Figure 11 This is a cross-sectional schematic diagram of the feed hollow tube structure of the present invention; Figure 12 This is a plan view and a partially enlarged schematic diagram of the device structure of the present invention.

[0017] Legend: 1. Cable conductor; 11. Cast-in-place housing; 111. Upper housing; 112. Observation window; 113. Handle; 114. Lower housing; 115. Limiting groove; 116. Locking groove; 117. Locking plate; 2. Exhaust assembly; 21. Pressure cylinder; 211. Protrusion; 22. Sealing ring; 23. Adjusting rod; 24. Feed hollow tube; 241. First-stage groove; 242. Second-stage groove; 243. Hollow groove; 244. One-way valve; 3. Pre-tightening component; 31. Worm gear; 32. Worm wheel; 33. Clamping arm; 331. Gear. Detailed Implementation

[0018] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0019] Reference Figure 1-12As shown, the present invention provides a technical solution: a large-section cable connector, including two sets of cable conductors 1, with a casting shell 11 fitted at the joint of the two sets of cable conductors 1. The internal space of the casting shell 11 is a filling chamber, which is filled with molten tin-copper alloy. The melting point of the molten tin-copper alloy is approximately 227°C. The molten tin-copper alloy is lead-free, more environmentally friendly, and has conductivity close to that of pure copper. It also has better high-temperature resistance and is more suitable for large-section copper core cables. The molten tin-copper alloy can also be replaced with other metal molten liquids depending on the specific material of the cable conductors 1. An exhaust component 2 is movably installed on the inner wall of the casting shell 11 to remove excess air from the filling chamber except for the molten tin-copper alloy. After the molten tin-copper alloy cools and solidifies, it forms a weld block. Air inside the filling chamber may cause bubble marks on the surface of the weld block. Such surface defects will undoubtedly affect the power supply. Therefore, it is necessary to remove the residual air in the filling chamber to ensure stable power supply.

[0020] The venting assembly 2 further includes pressure cylinders 21 symmetrically slidably mounted at both ends of the inner wall of the casting housing 11 and movable towards each other. The two sets of pressure cylinders 21 and the space of the inner wall of the casting housing 11 together form a relatively sealed liquid filling chamber. A pre-tightening component 3 for pre-tightening the cable conductors 1 is movably installed at the end of the pressure cylinder 21 away from the joint of the two sets of cable conductors 1. A sealing ring 22 is sealed and engaged on the inner wall of the end of the pressure cylinder 21 near the joint of the two sets of cable conductors 1. A circular through hole for cable conductors 1 of different thicknesses to pass through is opened on the surface of the sealing ring 22 near the pre-tightening component 3 and at the center of the sealing ring 22. The casting housing 11 further includes an upper housing 111 and a lower housing 114. The upper housing 111 and the lower housing 114 are connected by corresponding dimensions. The upper shell 111 has two sets of feed hollow tubes 24 symmetrically threaded on its upper surface. The two sets of feed hollow tubes 24 are T-shaped and have hollow cavities. The bottom of the feed hollow tubes 24 has multiple sets of hollow grooves 243 at equal angles around the axis. The internal space of the feed hollow tubes 24 is connected to the filling chamber. The inner wall of the hollow cavity of the two sets of feed hollow tubes 24 is equipped with a one-way valve 244, and the one-way valves 244 of the two sets of feed hollow tubes 24 open and close in opposite directions. An adjusting rod 23 is rotatably connected to one side of the outer wall of the lower shell 114. The outer walls of both ends of the adjusting rod 23 have threads in opposite directions, and the threads of both ends of the adjusting rod 23 are threaded to the pressure cylinder 21 at the corresponding positions.

[0021] The operator first holds the handle 113 with one hand to ensure the stability of the equipment. Then, with one hand, the operator inserts the two sets of cable conductors 1 one by one from the openings at both ends of the cast-welded housing 11. The cable conductor 1 first contacts the sealing ring 22 made of high-temperature resistant silicone. Guided by the conical concave surface, the cable conductor 1 is precisely inserted into the circular through hole. During the insertion process, the circular through hole is continuously expanded. Since the inner diameter of the circular through hole is slightly smaller than the outer diameter of the cable conductor 1, the circular through hole in the center of the sealing ring 22 is tightly attached to the cable conductor 1. At this time, the filling chamber is in a completely sealed space. The sealing ring 22 made of high-temperature resistant elastic silicone can accommodate cable conductors 1 of different thicknesses to maintain the airtightness of the filling chamber at all times, thereby preventing leakage during the filling process and ensuring the practicality and stability of the equipment. Then, the pre-tightening components 3 on both sides are driven to initially position and fix the cable conductor 1 from both ends to prevent the cable conductor 1 from shaking during the filling process and causing leakage in the filling chamber, thus ensuring the stability of the filling process.

[0022] Next, molten tin-copper alloy is poured into the filling chamber through a conveyor and one of the sets of feed hollow tubes 24. During the pouring process, the one-way valve 244 inside the set of feed hollow tubes 24 is in the open state. The output end of the conveyor is threadedly connected to the second groove 242 on the upper surface of the set of feed hollow tubes 24 through a heat-resistant tube. During the pouring process, the condition inside the filling chamber is continuously observed through the observation window 112. Then, when the molten tin-copper alloy gradually fills the filling chamber, the torsion head is turned. The torsion head drives the adjusting rod 23 to rotate, and the rotation of the adjusting rod 23 synchronously drives the two sets of pressure cylinders 21 to move towards each other. During the movement of the two sets of pressure cylinders 21 towards each other, the space inside the filling chamber is continuously compressed. The molten tin-copper alloy in the compressed space is squeezed upward. During the process of being pressurized, the molten tin-copper alloy gradually expels air bubbles. The air bubbles and part of the molten tin-copper alloy pass through the other... A set of feed hollow tubes 24 is discharged, and the one-way valve 244 of the set of feed hollow tubes 24 is in the open state until the two sets of pressure cylinders 21 move to the limit position. The pressure cylinder 21 moves to the limit position, which means that the protrusion 211 moves to the end of the limiting groove 115. When the two sets of pressure cylinders 21 move to the limit position, the curved outer wall of the set of pressure cylinders 21 will close and cut off the feed hollow tube 24 passage corresponding to the one-way valve 244 in the open state, i.e., the sinking through hole. Finally, the air inside the filling chamber is effectively discharged, ensuring that the surface of the weld block formed after the tin-copper alloy melt cools is regular and smooth. The two sets of cable conductors 1 are fully soaked by the tin-copper alloy melt, and the two sets of cable conductors 1 are tightly connected by the weld block formed after the tin-copper alloy melt cools. This connection method is more stable and applicable to cable conductors 1 of different thicknesses, and has a wide range of applications.

[0023] Reference Figure 4-9As shown in this embodiment: Multiple sets of smooth protrusions 211 are fixed at equal angles around the axis on the outer wall of the end of the pressure cylinder 21 furthest from the pre-fastening component 3. The protrusions 211 are slidably connected to the upper housing 111 and the lower housing 114, respectively. Limiting grooves 115, matching in size and shape, are provided at the contact points between the upper housing 111 and the lower housing 114 and the protrusions 211. The slidable connection between the multiple sets of smooth protrusions 211 and the limiting grooves 115 enhances the stability of the pressure cylinder 21's movement. Simultaneously, the limiting grooves 115 provide a fixed-distance limit for the pressure cylinder 21, ensuring the accuracy of the pressure applied to the filling chamber.

[0024] Reference Figure 4-9 As shown in this embodiment: the sealing ring 22 is made entirely of high-temperature resistant elastic silicone, and the sealing ring 22 elastically fits the outer wall of the cable conductor 1. The surface of the circular through-hole near the pre-tightening component 3 is concave and tapered. The high-temperature resistant elastic silicone sealing ring 22 ensures that it remains tightly fitted to the surface of the cable conductor 1, reducing gaps. Combined with the concave and tapered surface, this ensures that the device can be used with cable conductors of different thicknesses while maintaining the airtightness of the filling chamber.

[0025] Reference Figure 1-12 As shown in this embodiment: one end of the adjusting rod 23 is fixed with a torsion head, and both ends of the adjusting rod 23 pass through the corresponding pressure cylinders 21. The pressure cylinders 21 and the adjusting rod 23 have threaded holes of matching size and thread orientation at their contact points. By rotating the adjusting rod 23, the two sets of pressure cylinders 21 move closer together, uniformly compressing the internal space of the filling chamber.

[0026] Reference Figure 11 As shown in this embodiment: a first groove 241 is formed at the center of the top surface of the feed hollow tube 24, and a second groove 242 is formed at the center of the first groove 241. The first groove 241 and the second groove 242 are in a descending stepped shape. The inner wall of the first groove 241 is hexagonal, and the inner wall of the second groove 242 is circular. The inner wall of the second groove 242 is threaded. The tubular outer wall of the feed hollow tube 24 is threaded, and the inner spaces of the first groove 241 and the second groove 242 are connected to the hollow cavity. The hexagonal inner wall of the first groove 241 can be fitted with an Allen wrench. When the molten tin-copper alloy solidifies after cooling, the Allen wrench can be inserted into the first groove 241 and twisted to remove it. At this time, the operator can use the testing equipment to insert into the recessed through hole to check whether the hardness parameter of the welded block meets the standard. The thread on the inner wall of the second groove 242 can be tightly connected with the heat-resistant tube connected to the conveying component.

[0027] Reference Figure 3-11As shown in this embodiment: the tubular outer wall of the feed hollow tube 24 is threadedly connected to the upper housing 111, and a recessed through hole of matching size and shape is provided at the contact position between the upper housing 111 and the feed hollow tube 24. The threads on the outer wall of the feed hollow tube 24 are tightly connected to the upper housing 111, and the recessed through hole can also be used to reinforce and fix the feed hollow tube 24.

[0028] Reference Figure 8-9 As shown in this embodiment, the pre-tightening component 3 includes a worm gear 32 rotatably connected to one end surface of the pressure cylinder 21, with the center line of the worm gear 32 coinciding with the axis of the pressure cylinder 21 and the welded housing 11. A worm 31 is rotatably connected to one end of the outer wall of the pressure cylinder 21, located above the worm gear 32. One end of the worm 31 penetrates the outer wall of the pressure cylinder 21 and is fixed with a torsion block. The worm gear 31 drives the worm wheel 32, and the self-locking characteristics of the worm gear 31 and worm wheel 32 can prevent the multiple clamping arms 33 from loosening, ensuring the pre-tightening strength of the cable conductor 1.

[0029] Reference Figure 8-9 As shown in this embodiment: the worm gear 32 is generally annular, and the inner sidewall of the worm gear 32 is provided with an internal gear ring at equal angles around the axis. Multiple sets of clamping arms 33 are rotatably mounted on the outer wall of one end of the pressure cylinder 21 at equal angles around the axis. A gear 331 is fixed at the axial position of one side of the outer wall of each set of clamping arms 33, and the gear 331 meshes with the internal gear ring. While the worm gear 32 rotates, the synchronous meshing of the internal gear ring drives each set of gears 331 and clamping arms 33 to converge, achieving pre-tightening of the cable conductor 1.

[0030] Reference Figure 1-12 As shown in this embodiment: an observation window 112 is installed at the center of the upper surface of the upper housing 111; a handle 113 is fixed to the upper surface of the upper housing 111; a locking piece 117 is embedded in one side wall of both the upper housing 111 and the lower housing 114; and a locking groove 116 of matching size and shape is provided at the contact position between the upper housing 111 and the lower housing 114 and the locking piece 117. During the process of injecting liquid into the filling chamber, the operator can constantly observe through the observation window 112 to ensure real-time adjustment of the injection progress. The handle 113 allows the operator to hold the device with one hand. The locking groove 116 at one end of the upper housing 111 and the lower housing 114, together with the locking piece 117, the dovetail groove, and the dovetail corresponding to the dovetail groove, are securely spliced ​​and fixed.

[0031] Working principle: First, the equipment needs to be fixed and the cable conductors 1 inserted and sealed. The operator first holds the handle 113 with one hand to ensure the stability of the equipment, and then inserts the two sets of cable conductors 1 one by one from the openings at both ends of the welded housing 11. The cable conductor 1 first contacts the sealing ring 22, which is made of high-temperature resistant elastic silicone. Guided by the conical concave surface on the side of the circular through hole on the sealing ring 22 near the pre-tightening component 3, it is accurately inserted into the circular through hole. During the insertion process, the circular through hole is continuously expanded. Since the inner diameter of the circular through hole is slightly smaller than the outer diameter of the cable conductor 1, the circular through hole in the center of the sealing ring 22 will elastically fit against the outer wall of the cable conductor 1. At this time, the filling chamber formed by the two sets of pressure cylinders 21 and the inner wall space of the welded housing 11 is in a completely sealed state. The sealing ring 22, made of high-temperature resistant elastic silicone, can be adapted to cable conductors 1 of different thicknesses, always maintaining the airtightness of the filling chamber, preventing leakage during filling, and ensuring the practicality and stability of the equipment.

[0032] Next, the cable conductor 1 is pre-tightened and fixed: the torsion block on the worm 31 on the outer wall of the pressure cylinder 21 in the pre-tightening component 3 is rotated to drive the worm 31 to rotate; the worm 31 drives the worm wheel 32 that meshes with it to rotate, and the worm wheel 32 drives the gears 331 on the multiple sets of clamping arms 33 to rotate synchronously through the internal gear ring on the inner side wall, so that the multiple sets of clamping arms 33 converge synchronously, and the cable conductor 1 is initially positioned and fixed from both ends; by utilizing the self-locking characteristics of the worm 31 and the worm wheel 32, the multiple sets of clamping arms 33 can be prevented from loosening, and the cable conductor 1 can be prevented from shaking during the liquid filling process, which would cause leakage of the liquid filling chamber, thus ensuring the stability of the liquid filling process.

[0033] The molten tin-copper alloy is injected into the filling chamber again: the molten tin-copper alloy is output through the conveyor, and the output end of the conveyor is threadedly connected to the second groove 242 on the upper surface of one set of feed hollow tubes 24 through a heat-resistant tube; the molten tin-copper alloy is injected into the filling chamber through the hollow cavity of the set of feed hollow tubes 24, and the one-way valve 244 inside the set of feed hollow tubes 24 is in the open state during injection; during the injection process, the operator can observe the internal condition of the filling chamber in real time through the observation window 112 at the center of the upper surface of the upper shell 111 in order to adjust the injection progress.

[0034] Then, the filling chamber space is compressed and vented: After the molten tin-copper alloy gradually fills the filling chamber, the torsion head at one end of the adjusting rod 23 is turned, causing the adjusting rod 23 to rotate; since the outer walls at both ends of the adjusting rod 23 have threads in opposite directions, and are respectively connected to the threaded through holes on the corresponding pressure cylinders 21, the rotation of the adjusting rod 23 will synchronously drive the two sets of pressure cylinders 21 to move towards each other along the limiting grooves 115 on the upper shell 111 and the lower shell 114; the multiple sets of smooth protrusions 211 on the outer wall of the pressure cylinder 21 are slidably connected to the limiting grooves 115, improving the stability of movement, while the limiting grooves 115 exert pressure on the pressure cylinders 21. Cylinder 21 provides a fixed distance limit; during the process of the two sets of pressure cylinders 21 moving towards each other, the internal space of the filling chamber is continuously compressed, and the molten tin-copper alloy is squeezed upward under pressure, expelling the air bubbles in the filling chamber. The air bubbles and part of the molten tin-copper alloy are discharged through the feed hollow pipe 24, which is in the open state of another set of one-way valves 244, until the two sets of pressure cylinders 21 move to the limit position (that is, the protrusion 211 moves to the end of the limiting groove 115). At this time, the curved outer wall of one set of pressure cylinders 21 seals and cuts off the corresponding sinking through hole of the feed hollow pipe 24, thus completing the effective discharge of air inside the filling chamber.

[0035] Finally, welding solidification and subsequent operations: After the filling chamber is sealed, the molten tin-copper alloy cools and solidifies within the filling chamber to form a weld block. The molten tin-copper alloy fully saturates the ends of the two sets of cable conductors 1, and the two sets of cable conductors 1 are tightly connected through the weld block. After the molten tin-copper alloy has completely cooled and solidified, an Allen wrench is inserted into the first groove 241 at the top of the feed hollow tube 24 and twisted to remove the feed hollow tube 24 from the recessed through hole of the upper housing 111. Subsequently, the operator can insert the testing equipment into the lower... The through hole is used to check whether the hardness parameters of the welded block meet the standards. Throughout the process, the upper shell 111 and the lower shell 114 of the welded shell 11 are spliced ​​together by dovetail grooves and dovetails of corresponding sizes, and are firmly fixed by locking groove 116 on one side wall and locking piece 117. The feed hollow tube 24 is threaded to the upper shell 111 through the thread on the tubular outer wall. The through hole strengthens its fixation. The one-way valves 244 of the two sets of feed hollow tubes 24 open and close in opposite directions to ensure that the liquid filling and venting processes are carried out in an orderly manner.

[0036] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A large-section cable connector, characterized in that, The device includes two sets of cable conductors, with a welding shell fitted at the joint of the two sets of cable conductors. The internal space of the welding shell is a liquid filling chamber filled with molten tin-copper alloy. An exhaust assembly for removing excess air from the liquid filling chamber, excluding the molten tin-copper alloy, is movably installed on the inner wall of the welding shell. The exhaust assembly includes pressure cylinders symmetrically slidably installed at both ends of the inner wall of the welding shell and movable towards each other. The two pressure cylinders and the inner wall space of the welding shell together form a relatively sealed liquid filling chamber. A pre-tightening component for pre-tightening the cable conductors is movably installed at the end of the pressure cylinder away from the joint of the two sets of cable conductors. A sealing ring is sealed and engaged on the inner wall of the end of the pressure cylinder near the joint of the two sets of cable conductors. A pre-tightening component is provided at the center of the sealing ring near the surface of the pre-tightening component. A circular through-hole is provided for cable conductors of different thicknesses to pass through; the welded housing includes an upper housing and a lower housing, which are joined together by dovetail grooves and dovetails of corresponding sizes. The upper surface of the upper housing is symmetrically threaded with two sets of feed hollow tubes; both sets of feed hollow tubes are T-shaped and have hollow cavities. The bottom end of each feed hollow tube has multiple sets of hollow grooves at equal angles around its axis. The internal space of each feed hollow tube communicates with the filling chamber. One-way valves are installed on the inner walls of the hollow cavities of both sets of feed hollow tubes, and the opening and closing directions of the one-way valves of the two sets of feed hollow tubes are opposite. An adjusting rod is rotatably connected to one side of the outer wall of the lower housing. The outer walls of both ends of the adjusting rod have threads in opposite directions, and the threads at both ends of the adjusting rod are respectively connected to the threads of the pressure cylinder at the corresponding positions.

2. The large cross-section cable connector according to claim 1, characterized in that: The outer wall of the end of the pressure cylinder away from the pre-tightening component is fixed with multiple sets of smooth protrusions at equal angles around the axis. The protrusions are slidably connected to the upper shell and the lower shell respectively, and the upper shell and the lower shell are provided with limiting grooves of matching size and shape at the contact positions with the protrusions.

3. The large cross-section cable connector according to claim 1, characterized in that: The sealing ring is made entirely of high-temperature resistant elastic silicone, and the sealing ring is elastically fitted to the outer wall of the cable conductor. The surface of the circular through hole near the pre-tightening component is concave in a conical shape.

4. The large cross-section cable connector according to claim 1, characterized in that: One end of the adjusting rod is fixed with a torsion head, and the two ends of the adjusting rod pass through pressure cylinders at corresponding positions. The pressure cylinders have threaded holes of matching size and thread orientation at the contact position with the adjusting rod.

5. The large cross-section cable connector according to claim 1, characterized in that: A first-stage groove is formed at the center of the top surface of the feed hollow tube, and a second-stage groove is formed at the center of the first-stage groove. The first-stage groove and the second-stage groove are in a descending step shape.

6. The large cross-section cable connector according to claim 5, characterized in that: The inner wall of the first groove is hexagonal, the inner wall of the second groove is circular, and the inner wall of the second groove is threaded. The outer wall of the feed hollow tube is threaded, and the inner space of the first groove and the second groove is connected to the hollow cavity.

7. The large cross-section cable connector according to claim 1, characterized in that: The tubular outer wall of the feed hollow tube is threaded to the upper shell, and a recessed through hole of matching size and shape is provided at the contact position between the upper shell and the feed hollow tube.

8. The large cross-section cable connector according to claim 1, characterized in that: The pre-tightening component includes a worm gear rotatably connected to one end surface of the pressure cylinder, and the center line of the worm gear coincides with the axis of the pressure cylinder and the welded housing. A worm is rotatably connected to one end of the outer wall of the pressure cylinder above the worm gear, and one end of the worm penetrates the outer wall of the pressure cylinder and is fixed with a torsion block.

9. The large cross-section cable connector according to claim 8, characterized in that: The worm gear is ring-shaped, and the inner wall of the worm gear is provided with an internal gear ring at equal angles around the axis. Multiple sets of clamping arms are rotatably mounted on the outer wall of one end of the pressure cylinder at equal angles around the axis. A gear is fixed at the axial position of one side of the outer wall of each set of clamping arms, and the gear meshes with the internal gear ring.

10. The large-section cable connector according to claim 1, characterized in that: An observation window is installed at the center of the upper surface of the upper housing. A handle is fixed to the upper surface of the upper housing. A locking plate is embedded in one side wall of both the upper and lower housings. Lock grooves of matching size and shape are opened at the contact positions between the upper and lower housings and the locking plate.

Images