Large cross-section cable connector

Abstract

The application relates to the technical field of cable connection, and discloses a large-section cable connector which comprises two groups of cable conductors, a pouring and welding shell is sleeved at the butt joint of the two groups of cable conductors, the internal space of the pouring and welding shell is a liquid filling cavity, the liquid filling cavity is filled with tin-copper alloy molten liquid, and an exhaust assembly for exhausting the excess air in the liquid filling cavity except the tin-copper alloy molten liquid is movably installed on the inner wall of the pouring and welding shell. The device is composed of the pouring and welding shell, the compression cylinder, the adjusting rod, the feeding hollow pipe of the two-way one-way valve and the tin-copper alloy molten liquid, the compression cylinder and the pouring and welding shell form a closed liquid filling cavity, the adjusting rod drives the compression cylinder to compress the cavity, the feeding hollow pipe is used for exhausting the air and the excess molten liquid, the welding block bubbles are eliminated, the molten liquid is filled in the butt joint gap of the cable conductors by using the fluidity of the molten liquid, and a tight welding block is formed after solidification. The double effects avoid the ion spark caused by the butt joint gap, and the power-on reliability of the large-section cable is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cable connection, in particular to a large-section cable connector. BACKGROUND

[0002] As the core development direction of modern power system, the stability of power transmission link of smart grid depends on the support of cable and its related connecting components; in the power transmission system of smart grid, general accessories are the basis for ensuring the adaptive operation of equipment and transmission carrier, among which cable joints are widely used as core general accessories; cables need to be laid in sections, and cable joints (also known as cable heads) are the key components to realize line continuity; the intermediate joint is used to connect two sections of cables in the middle of the line, and the terminal head is used to connect two ends with the equipment, which not only can lock and fix the incoming and outgoing lines, but also can prevent water, dust and vibration, providing protection for the reliable operation of smart grid; the main body of the existing large-section cable connector is a torsion joint pipe, which is usually made of high-strength metals such as copper alloy and aluminum alloy, and has a specific thread structure or groove inside; during installation, a special torsion tool is used to apply a preset torque, so that the joint pipe and the conductor of the cable are tightly engaged and deformed to wrap, thereby forming a firm electrical and mechanical connection, which is widely used in high-voltage transmission lines to realize stable current transmission of large-section cables; however, the traditional torsion joint pipe only relies on bolts to connect the conductors at both ends, and in actual application, the existence of gaps at the connection due to the inconsistent thickness of the conductors often leads to heat generation when current passes through due to the large gap resistance, and air is ionized to form an electric spark under the action of an electric field; the electric spark will ablate the surface of the cable conductor and the joint pipe, increase the contact resistance, and further cause the cable insulation layer to overheat, age, or even ignite, which is a key factor restricting the reliability of large-section metal wire connection.

[0003] Therefore, it is necessary to propose a large-section cable connector to solve the above problems. SUMMARY

[0004] The technical problem to be solved by the present application is that in the prior art, ionization sparks may be generated at the connection of the conductors due to the gap and thickness difference, which affects the reliability of power transmission, therefore, we propose a large-section cable connector.

[0005] In order to achieve the above object, the technical scheme adopted by the present application is as follows: a large-section cable connector, comprising two groups of cable conductors, a pouring shell is sleeved at the butt joint of the two groups of cable conductors, the internal space of the pouring shell is a liquid filling cavity, and the liquid filling cavity is filled with a tin-copper alloy molten liquid, an exhaust assembly for exhausting the excess air in the liquid filling cavity except the tin-copper alloy molten liquid is movably installed on the inner wall of the pouring shell; the exhaust assembly further comprises two pressure cylinders which are symmetrically and slidably installed at the two ends of the inner wall of the pouring shell and can move towards each other, and the two pressure cylinders and the inner wall space of the pouring shell together constitute a relatively closed liquid filling cavity, a pre-tightening component for pre-tightening the cable conductors is movably installed at the end of the pressure cylinder away from the butt joint of the two groups of cable conductors; a sealing ring is sealingly clamped on the inner wall of the end of the pressure cylinder close to the butt joint of the two groups of cable conductors, a circular through hole for passing through cable conductors of different thicknesses is formed on the surface of the end of the sealing ring close to the pre-tightening component and located at the center position of the sealing ring; the pouring shell further comprises an upper shell and a lower shell, the upper shell and the lower shell are spliced by corresponding size dovetail grooves and dovetail upper and lower splicing, the upper surface of the upper shell is symmetrically and threadedly connected with two groups of feeding hollow pipes; the overall shape of the two groups of feeding hollow pipes is in the shape of the letter T, and each is provided with a hollow cavity, a plurality of hollow grooves are formed at equal angles around the axis at the bottom end of the feeding hollow pipe, the internal space of the feeding hollow pipe is communicated with the liquid filling cavity, a one-way valve is installed on the inner wall of the hollow cavity of the two groups of feeding hollow pipes, and the opening and closing directions of the one-way valves of the two groups of feeding hollow pipes are opposite; an adjusting rod is rotatably connected to the outer wall of one side of the lower shell, threads with opposite directions are formed on the outer walls of the two ends of the adjusting rod, and the threads at the two ends of the adjusting rod are respectively threadedly connected with the pressure cylinders at the corresponding positions.

[0006] Preferably, a plurality of round and smooth protrusions are fixed at equal angles around the axis at the outer wall of the end of the pressure cylinder away from the pre-tightening component, the protrusions are slidably connected with the upper shell and the lower shell respectively, and the upper shell and the lower shell are provided with matching limit grooves at the positions where they contact with the protrusions.

[0007] Preferably, the overall material of the sealing ring is high-temperature-resistant elastic silica gel, the sealing ring is elastically attached to the outer wall of the cable conductor, and the surface of the side of the circular through hole close to the pre-tightening component is in the shape of a conical recess.

[0008] Preferably, a twisting head is fixed to one end of the adjusting rod, the adjusting rod penetrates through the pressure cylinders at the corresponding positions respectively, and the pressure cylinders are provided with thread through holes which are matched in size and thread direction at the positions where they contact with the adjusting rod.

[0009] Preferably, a first step groove is formed at the center position of the top surface of the feeding hollow pipe, a second step groove is formed at the center position of the first step groove, and the first step groove and the second step groove are in the shape of a descending ladder.

[0010] Preferably, the inner wall of the first stage groove is hexagonal, the inner wall of the second stage groove is circular, and the inner wall of the second stage groove is threaded, the tubular outer wall of the feeding hollow pipe is threaded, and the inner space of the first stage groove and the second stage groove communicates with the hollow cavity.

[0011] Preferably, the tubular outer wall of the feeding hollow pipe is threadedly connected with the upper shell, and the upper shell is provided with a sunken through hole at the position in contact with the feeding hollow pipe, the sunken through hole being matched in size and shape.

[0012] Preferably, the pre-tightening component comprises a worm wheel rotatably connected to the surface of one end of the compression cylinder, the center line of the worm wheel coincides with the axis of the compression cylinder and the pouring shell, a worm is rotatably connected to the outer wall of one end of the compression cylinder and located above the worm wheel, and one end of the worm penetrates through the outer wall of the compression cylinder and is fixed with a torsion block.

[0013] Preferably, the worm wheel is annular, the inner wall of the worm wheel is provided with an inner gear ring at equal angles around the axis, and a plurality of groups of clamping arms are rotatably installed at equal angles around the axis of the outer wall of one end of the compression cylinder, each group of clamping arms is fixed with a gear at the position of the outer wall of one side, and the gear is engaged with the inner gear ring.

[0014] Preferably, the upper surface of the upper shell is provided with an observation window at the center position, the upper surface of the upper shell is fixed with a handle, and the upper shell and the lower shell are both embedded with a lock piece at one side wall, and the upper shell and the lower shell are both provided with a lock groove at the position in contact with the lock piece, the lock groove being matched in size and shape.

[0015] The technical effects and advantages of the present application are as follows: in the present application, the device is provided with a pouring shell, a compression cylinder, an adjusting rod, a feeding hollow pipe of a double-way one-way valve and a tin-copper alloy molten liquid, a closed liquid filling cavity is formed by the compression cylinder and the pouring shell, and the cavity is compressed by the adjusting rod: air and excess molten liquid are discharged through the feeding hollow pipe to eliminate bubbles in the welding block; and the molten liquid fills the joint gap of the cable conductor due to its fluidity, and forms a tight welding block after solidification. The double effects avoid the ion spark caused by the joint gap and improve the reliability of power transmission of the large cross-section cable. In the present application, the sealing ring made of high-temperature resistant elastic silica gel, the worm of the pre-tightening component, the worm wheel and the plurality of groups of clamping arms ensure the air tightness by elastically fitting the cable conductors of different thicknesses, the worm drives the worm wheel to drive the clamping arms to gather and fix the cable conductors to prevent the generation of gaps due to the shaking of the cable conductors, the gap problem caused by the difference in thickness of the cable and unstable joint is solved, the generation of ion spark is reduced, and the stability of power transmission is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0016] The disclosure of the present application will be described with reference to the accompanying drawings. It is to be noted that the drawings are only used for illustrative purposes, and are not intended to limit the scope of protection of the present application. In the drawings, the same reference signs are used to refer to the same parts:

[0017] Figure 1 is a schematic view of the front structure of the present application; Figure 2 is a schematic view of the partially cut structure of the present application; Figure 3 is a schematic view of the cut and internal structure of the upper shell of the present application; Figure 4 is a schematic view of the structure of the exhaust assembly of the present application; Figure 5 is a schematic view of the structure of the upper shell, lower shell, locking piece and locking groove of the present application; Figure 6 is a schematic view of the structure of the limiting groove of the present application; Figure 7 is a schematic view of the structure of the pouring shell and pre-tightening component of the present application; Figure 8 is a schematic view of the front structure of the pre-tightening component of the present application; Figure 9 is a schematic view of the structure of the sealing ring of the present application; Figure 10 is a schematic view of the cut structure of the pressing cylinder of the present application; Figure 11 is a schematic view of the cut structure of the feeding hollow pipe of the present application; Figure 12 is a schematic view of the cut and partially enlarged structure of the equipment of the present application.

[0018] Legend: 1, cable conductor; 11, pouring shell; 111, upper shell; 112, observation window; 113, handle; 114, lower shell; 115, limiting groove; 116, locking groove; 117, locking piece; 2, exhaust assembly; 21, pressing cylinder; 211, protruding block; 22, sealing ring; 23, adjusting rod; 24, feeding hollow pipe; 241, first step groove; 242, second step groove; 243, hollow groove; 244, one-way valve; 3, pre-tightening component; 31, worm; 32, worm wheel; 33, clamping arm; 331, gear. DETAILED DESCRIPTION

[0019] It is easy to understand that, according to the technical solution of the present application, those skilled in the art can propose a plurality of structure modes and implementation modes which can be replaced with each other without changing the essential spirit of the present application. Therefore, the following detailed description and drawings are only exemplary descriptions of the technical solution of the present application, and should not be considered as the whole or as a limitation or restriction on the technical solution of the present application.

[0020] Reference Figures 1-12As shown, the present application provides a technical solution: a large cross-section cable connector, comprising two groups of cable conductors 1, a pouring shell 11 is sleeved at the butt joint of the two groups of cable conductors 1, the internal space of the pouring shell 11 is a liquid filling cavity, and the liquid filling cavity is filled with a tin-copper alloy molten liquid, wherein the melting point of the tin-copper alloy molten liquid is about 227°C, the tin-copper alloy molten liquid does not contain lead, is more environmentally friendly, and has a conductivity close to pure copper and better high temperature resistance, and is more suitable for large cross-section copper core cables, and the tin-copper alloy molten liquid can also be replaced with other metal molten liquids according to the specific material of the cable conductor 1, and the inner wall of the pouring shell 11 movably installs an exhaust assembly 2 for removing the excess air in the liquid filling cavity except the tin-copper alloy molten liquid; the tin-copper alloy molten liquid forms a welding block after cooling and solidification, and the air in the liquid filling cavity can cause bubbles on the surface of the welding block, which undoubtedly affects the power supply, so it is necessary to remove the residual air in the liquid filling cavity to ensure the stability of the power supply.

[0021] The exhaust assembly 2 further includes two pressure cylinders 21 symmetrically and slidably installed at both ends of the inner wall of the pouring shell 11 and movable towards each other, the two pressure cylinders 21 and the inner wall space of the pouring shell 11 together form a relatively closed liquid filling cavity, and one end of the pressure cylinder 21 away from the butt joint of the two groups of cable conductors 1 movably installs a pre-tightening component 3 for pre-tightening the cable conductor 1; the inner wall of one end of the pressure cylinder 21 close to the butt joint of the two groups of cable conductors 1 is sealingly engaged with a sealing ring 22, and the surface of one end of the sealing ring 22 close to the pre-tightening component 3 and located at the center position of the sealing ring 22 is provided with a circular through hole for passing through cable conductors 1 of different thicknesses; the pouring shell 11 further includes an upper shell 111 and a lower shell 114, the upper shell 111 and the lower shell 114 are spliced by corresponding size dovetail grooves and dovetail joints, the upper surface of the upper shell 111 is symmetrically and threadedly connected with two groups of feeding hollow pipes 24; the overall shape of the two groups of feeding hollow pipes 24 is in the shape of the letter T, and each is provided with a hollow cavity, a plurality of hollow grooves 243 are formed at the bottom end of the feeding hollow pipe 24 around the axis at equal angles, the internal space of the feeding hollow pipe 24 communicates with the liquid filling cavity, and the inner wall of the hollow cavity of the two groups of feeding hollow pipes 24 is provided with a one-way valve 244, and the opening and closing directions of the one-way valves 244 of the two groups of feeding hollow pipes 24 are opposite; the outer wall of one side of the lower shell 114 is rotatably connected with an adjusting rod 23, the outer walls of both ends of the adjusting rod 23 are provided with threads in opposite directions, and the threads of both ends of the adjusting rod 23 are respectively threadedly connected with the corresponding positions of the pressure cylinders 21.

[0022] The operator first holds the handle 113 with one hand to ensure the stability of the device, and then inserts the two groups of cable conductors 1 from the two end openings of the pouring shell 11 one by one with one hand, wherein the cable conductor 1 first contacts the sealing ring 22 made of high-temperature-resistant silicone, and the cable conductor 1 is accurately inserted into the circular hole through the guide of the conical inner concave surface. During the insertion process, the circular hole is continuously expanded and enlarged. Since the inner diameter of the circular hole is slightly smaller than the outer diameter of the cable conductor 1, the circular hole at the center of the sealing ring 22 closely fits the cable conductor 1. At this time, the liquid filling cavity is in a completely sealed space. The sealing ring 22 made of high-temperature-resistant elastic silicone can be suitable for cable conductors 1 of different thicknesses to always maintain the air tightness of the liquid filling cavity, thereby preventing leakage during the liquid filling process and ensuring the practicality and stability of the device. Then, the pre-tightening components 3 on both sides are driven to preliminarily position and fix the cable conductors 1 from both ends, preventing the cable conductors 1 from shaking during the liquid filling process to cause the liquid filling cavity to leak, and ensuring the stability of the liquid filling process.

[0023] Then, the tin-copper alloy molten liquid is filled into the liquid filling cavity through the conveying member and one of the groups of feeding hollow pipes 24. During the filling process, the one-way valve 244 in the group of feeding hollow pipes 24 is in an open state. The output end of the conveying member is threadedly connected to the second step groove 242 on the upper surface of the group of feeding hollow pipes 24 through a heat-resistant pipe. During the liquid filling process, the status inside the liquid filling cavity is observed through the observation window 112. Then, when the tin-copper alloy molten liquid gradually fills the liquid filling cavity, the twist head is twisted, the twist head drives the adjusting rod 23 to rotate, and the two groups of pressing cylinders 21 move towards each other synchronously through the rotation of the adjusting rod 23. During the movement of the two groups of pressing cylinders 21, the space inside the liquid filling cavity is continuously compressed, and the tin-copper alloy molten liquid in the compressed space is squeezed upwards. During the compression process of the tin-copper alloy molten liquid, the bubbles are gradually discharged. The bubbles and part of the tin-copper alloy molten liquid are discharged through the other group of feeding hollow pipes 24. The one-way valve 244 of the group of feeding hollow pipes 24 is in an open state. Until the two groups of pressing cylinders 21 move to the limit position, the pressing cylinder 21 moves to the limit position means that the protrusion 211 moves to the end of the limiting groove 115. When the two groups of pressing cylinders 21 move to the limit position, the curved outer wall of one group of pressing cylinders 21 closes and cuts off the sinking through hole corresponding to the feeding hollow pipe 24 with the open one-way valve 244. Finally, the effective discharge of the air inside the liquid filling cavity is completed, ensuring that the surface of the soldering block formed after the tin-copper alloy molten liquid cools is regular and smooth. The end of the two groups of cable conductors 1 is fully immersed in the tin-copper alloy molten liquid, and the two groups of cable conductors 1 are tightly connected through the soldering block formed after the tin-copper alloy molten liquid cools. This connection method is more stable and suitable for cable conductors 1 of different thicknesses, and has a strong application range.

[0024] Referring to Figures 4-9As shown, in the embodiment: the outer wall of the compression cylinder 21 away from the pre-tightening component 3 is fixed with multiple groups of smooth protrusions 211 at equal angles around the axis, the protrusions 211 are respectively in sliding connection with the upper shell 111 and the lower shell 114, and the upper shell 111 and the lower shell 114 are provided with matching limit grooves 115 at the positions in contact with the protrusions 211. The sliding connection of the multiple groups of smooth protrusions 211 and the limit grooves 115 improves the stability of the movement of the compression cylinder 21, and the limit grooves 115 can provide distance limitation for the compression cylinder 21, ensuring the accuracy of the pressure degree of the liquid filling cavity.

[0025] Referring to Figures 4-9 As shown, in the embodiment: the sealing ring 22 is made of high-temperature-resistant elastic silica gel, and is elastically attached to the outer wall of the cable conductor 1, and the circular through hole near the surface of the one side of the pre-tightening component 3 is in a conical recessed shape. The sealing ring 22 made of high-temperature-resistant elastic silica gel can always be attached to the surface of the cable conductor 1, reducing the gap, and the conical recessed surface can ensure that the device can be applied to different thick and thin cable conductors 1 while ensuring the air tightness of the liquid filling cavity.

[0026] Referring to Figures 1-12 As shown, in the embodiment: the one end of the adjusting rod 23 is fixed with a twisting head, the two ends of the adjusting rod 23 respectively penetrate the corresponding positions of the compression cylinders 21, and the compression cylinders 21 are provided with thread through holes at the positions in contact with the adjusting rod 23, and the sizes and thread directions of the thread through holes are matched. By rotating the adjusting rod 23, the two compression cylinders 21 are driven to move towards each other, uniformly pressing the internal space of the liquid filling cavity.

[0027] Referring to Figure 11 As shown, in the embodiment: the top surface of the feeding hollow pipe 24 is provided with a first step groove 241 at the center position, the center position of the first step groove 241 is provided with a second step groove 242, the first step groove 241 and the second step groove 242 are in a descending ladder shape, the inner wall of the first step groove 241 is in a hexagonal shape, the inner wall of the second step groove 242 is in a circular shape, and the inner wall of the second step groove 242 is provided with threads, the tubular outer wall of the feeding hollow pipe 24 is provided with threads, and the inner space of the first step groove 241 and the second step groove 242 is communicated with the hollow cavity; the hexagonal inner wall of the first step groove 241 can be used with a hexagonal wrench, which can be inserted into the first step groove 241 and twisted to be disassembled when the tin-copper alloy molten liquid cools and solidifies, at which time the operator can insert the detection equipment into the sinking through hole to detect whether the hardness parameter of the welding block meets the standard, and the threads of the inner wall of the second step groove 242 can be tightly connected with the heat-resistant pipe connected with the conveying member.

[0028] Referring to Figures 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.

[0029] Reference Figures 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.

[0030] Reference Figures 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.

[0031] Reference Figures 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.

[0032] Working principle: First, the device needs to be fixed and the cable conductor 1 is inserted and sealed: the operator holds the handle 113 with one hand to ensure the stability of the device, and then inserts the two groups of cable conductors 1 one by one from the two end openings of the pouring shell 11. Among them, the cable conductor 1 first contacts the sealing ring 22 made of high-temperature resistant elastic silica gel, is guided by the conical inner recess surface on the side of the pre-tightening component 3 near the circular hole, and is accurately inserted into the circular hole. The circular hole is continuously expanded and enlarged during insertion, and because the inner diameter of the circular hole is slightly smaller than the outer diameter of the cable conductor 1, the circular hole in the center of the sealing ring 22 will be elastically attached to the outer wall of the cable conductor 1. At this time, the liquid filling cavity formed by the space between the two groups of pressure cylinders 21 and the inner wall of the pouring shell 11 is in a completely sealed state. The sealing ring 22 made of high-temperature resistant elastic silica gel can adapt to cable conductors 1 of different thicknesses, always maintaining the airtightness of the liquid filling cavity, preventing leakage during liquid filling, and ensuring the practicality and stability of the device.

[0033] Secondly, the cable conductor 1 is pre-tightened and fixed: rotate the torsion block on the outer wall of the worm 31 at one end of the pressure cylinder 21 in the pre-tightening component 3, drive the worm 31 to rotate; the worm 31 drives the worm wheel 32 engaged with it to rotate, and the worm wheel 32 synchronously engages the multiple sets of gear wheels 331 on the multiple sets of clamping arms 33 through the inner tooth ring on the inner side wall, so that the multiple sets of clamping arms 33 are synchronously gathered and the cable conductors 1 are preliminarily positioned and fixed from both ends. Using the self-locking property of the worm 31 and the worm wheel 32 can prevent the multiple sets of clamping arms 33 from loosening, avoid the cable conductors 1 from shaking during liquid filling, prevent the liquid filling cavity from leaking, and ensure the stability of the liquid filling process.

[0034] Thirdly, the tin-copper alloy molten liquid is filled into the liquid filling cavity: the tin-copper alloy molten liquid is output through the conveying member, and the output end of the conveying member is threadedly connected to the second step groove 242 on the upper surface of one of the feeding hollow pipes 24 through a heat-resistant pipe; the tin-copper alloy molten liquid is filled into the liquid filling cavity through the hollow cavity of the feeding hollow pipe 24, and the one-way valve 244 inside the feeding hollow pipe 24 is in an open state during filling. During the liquid filling process, the operator can observe the internal condition of the liquid filling cavity through the observation window 112 at the center position of the upper surface of the upper shell 111 to adjust the liquid filling progress.

[0035] Then the liquid filling cavity space is compressed and exhaust: after the tin-copper alloy molten liquid gradually fills the liquid filling cavity, the twist head at one end of the adjusting rod 23 is twisted to drive the adjusting rod 23 to rotate; because the outer walls at both ends of the adjusting rod 23 are provided with threads in opposite directions and are respectively threadedly connected with the thread holes on the corresponding positions of the pressing cylinders 21, the rotation of the adjusting rod 23 will synchronously drive the two groups of pressing cylinders 21 to move towards each other along the limiting grooves 115 on the upper shell 111 and the lower shell 114; the plurality of smooth protrusions 211 on the outer wall of the pressing cylinder 21 are in sliding connection with the limiting grooves 115, so that the moving stability is improved, and the limiting grooves 115 provide distance limiting for the pressing cylinders 21; during the movement of the two groups of pressing cylinders 21 towards each other, the space inside the liquid filling cavity is continuously compressed, and the tin-copper alloy molten liquid is pressed upwards to extrude and exhaust the air bubbles in the liquid filling cavity; the air bubbles and part of the tin-copper alloy molten liquid are exhausted through the feeding hollow pipes 24 with the open one-way valves 244, until the two groups of pressing cylinders 21 move to the limit positions (i.e. the protrusions 211 move to the ends of the limiting grooves 115), at which time the curved outer wall of one group of pressing cylinders 21 will close and cut off the corresponding sinking through holes of the feeding hollow pipe 24, so that the air inside the liquid filling cavity is effectively exhausted.

[0036] Finally, welding solidification and subsequent operation: after the liquid filling cavity is closed, the tin-copper alloy molten liquid cools and solidifies in the liquid filling cavity to form a welding block, the tin-copper alloy molten liquid fully fills the end of the two groups of cable conductors 1, and the two groups of cable conductors 1 are tightly connected through the welding block; after the tin-copper alloy molten liquid completely cools and solidifies, a hexagonal wrench is inserted into the first stage groove 241 at the top end of the feeding hollow pipe 24 and twisted to disassemble the feeding hollow pipe 24 from the sinking through hole of the upper shell 111, and then the operator can insert the sinking through hole through the detection equipment to detect whether the hardness parameters of the welding block meet the standards; during the whole process, the upper shell 111 and the lower shell 114 of the pouring and welding shell 11 are spliced through the corresponding size dovetail grooves and dovetail upper and lower splicing, and are firmly fixed through the lock slot 116 on one end of the side wall cooperating with the lock piece 117, the feeding hollow pipe 24 is threadedly connected with the upper shell 111 through the threads on the tubular outer wall, the sinking through hole plays a role in reinforcing the fixing, and the opening and closing directions of the two groups of feeding hollow pipes 24 are opposite, so that the liquid filling and exhaust process is orderly carried out.

[0037] The technical scope of the present application is not limited to the content in the above description, and those skilled in the art can make various modifications and changes to the above embodiments without departing from the technical idea of the present application, and these modifications and changes should all belong to the protection scope of the present application.

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.

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