Large-cross-section branching device for trunk line convergence, trunk line convergence cable and manufacturing method of large-cross-section trunk line convergence cable

Abstract

The invention discloses a large-section branching device for trunk line convergence, a trunk line convergence cable and a manufacturing method. The large-section branching device for trunk line convergence comprises a connecting piece, an inner protective shell and an outer protective shell. The connecting piece is used for crimping at least one branch cable on the main cable, so that the main cable is electrically connected with the branch cable; the connecting piece comprises a first connecting part and a second connecting part, a cavity is defined by the first connecting part and the second connecting part during crimping, and at least one accommodating cavity for accommodating a branch cable is formed in the inner side wall of the first connecting part and / or the second connecting part; a connecting groove is formed in the outer side wall of the second connecting part, an extending part is arranged at the position, corresponding to the connecting groove, of the first connecting part, and the extending part is tightly connected with the connecting groove after pressing so that the first connecting part and the second connecting part can be connected together in a pressing mode, and the main cable and the branch cable can be connected together in a pressing mode. The connecting piece adopts irregular design and two-side separated combination, can crimp a plurality of branch cables, and is convenient to assemble.

Description

Technical Field

[0001] The present invention relates to a brancher for large-section trunk line convergence, a trunk line convergence cable and a manufacturing method, belonging to the technical field of cables. Background Art

[0002] In a solar photovoltaic power generation array, there are many branch power generation modules, which are connected to copper conductor photovoltaic lines in the branches and need to be merged into the main line. The existing operation method is: the control box in the solar panel is first connected to the junction box through multiple strands of small-section copper conductor cables and then connected to the inverter. This operation method has many types and quantities of small-section connection harnesses, which is complicated to install, requires many installation parts, and has high installation labor costs. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a large-section main line merging brancher, main line merging cable and manufacturing method that has fewer types of branch cables, saves junction boxes, reduces installation costs, and can directly convert the copper conductors connected to the branches into aluminum conductor cables and connect them to the aluminum conductor cables running on the main line.

[0004] To achieve the aforementioned object of the invention, the technical solutions adopted by the present invention include:

[0005] On one hand, the present invention discloses a branching device for large-section trunk line confluence, comprising a connector, an inner protective shell, and an outer protective shell. The connector is used to crimp at least one branch cable onto the main line cable to electrically connect the main line cable and the branch cable; the connector comprises a first connector and a second connector, which enclose a cavity when crimped, and at least one accommodating cavity for accommodating the branch cable is provided on the inner side wall of the first connector and / or the second connector; a connecting groove is provided on the outer side wall of the second connector, and an extension portion is provided at a position corresponding to the connecting groove on the first connector, and after crimping, the extension portion is tightly connected to the connecting groove, so that the first connector and the second connector are crimped together, and the main line cable and the branch cable are crimped together;

[0006] The inner protective shell is arranged on the outer surface of the connector, and the inner protective shell covers the connector, a portion of the main line cable and a portion of the branch line cable;

[0007] The outer protective shell is arranged on the outer surface of the inner protective shell, and the outer protective shell at least completely covers the inner protective shell. The outer protective shell is at least used to protect the connection between the connector, the main line cable and the branch line cable.

[0008] Furthermore, both ends of the outer protective shell are provided with outlet connecting tubes, and the outlet connecting tubes include a main line connecting tube and a branch line connecting tube. The main line connecting tube wraps the main line cable to enhance the flexibility between the outer protective shell and the main line cable; the branch line connecting tube wraps the branch line cable to enhance the flexibility between the outer protective shell and the branch line cable.

[0009] Furthermore, the connecting piece is made of aluminum.

[0010] Furthermore, the inner protective shell is made of PP or TPV.

[0011] Furthermore, the outer protective shell is made of TPV material.

[0012] Another aspect of the present invention discloses a large-section trunk bus cable, including a branch connector for large-section trunk bus. A main line cable and at least one branch line cable are arranged in the connector, and the main line cable and the branch line cable are crimped by the connector. The inner protective shell covers the connection between the connector, the main line cable and the branch line cable. The outer protective shell is arranged on the outer surface of the inner protective shell. The main line cable passes through the main line connecting tube and extends out of the main line connecting tube. The inner side wall of the main line connecting tube is tightly connected to the outer surface of the main line cable. The branch cable passes through the branch line connecting tube and extends out of the branch line connecting tube. The inner side wall of the branch line connecting tube is tightly connected to the outer surface of the branch cable.

[0013] The core of the main line cable is an aluminum core; the core of the branch line cable includes two cores made of different materials, which are connected by terminals, one of which is an aluminum core. The aluminum core on the branch line cable is crimped to the aluminum core in the main line cable through a connector.

[0014] Furthermore, the terminal includes a first connector, a second connector and a connecting sleeve, the connecting sleeve is connected to the first connector and the second connector respectively, the first connector is made of aluminum, the aluminum core of the branch cable is connected to the first connector, and the material of the second connector is different from that of the first connector.

[0015] Furthermore, the second connector is made of copper, and the branch cable also includes a copper core, which is located at one end of the branch cable away from the aluminum core, and the copper core of the branch cable is connected to the second connector.

[0016] Furthermore, the aluminum wire core is welded or crimped to the first connector, and the copper wire core is welded or crimped to the second connector.

[0017] The present invention also discloses a method for manufacturing a large-section trunk bus cable, comprising the following steps:

[0018] S10. Use a wire stripping machine to strip part of the outer covering of the main cable and the branch cable, so that the core of the main cable and the branch cable is exposed at the part where they need to be connected;

[0019] S20, performing heat shrinkage treatment on the edge of the skin where the skin is peeled off;

[0020] S30, crimping the cores of the main cable and the branch cable together through a connector;

[0021] S40, using an injection molding machine to injection mold an inner protective shell on the outer surface of the connector;

[0022] S50, using an injection molding machine to injection-mold an outer protective shell on the outer surface of the inner protective shell.

[0023] Furthermore, in S20, the surface of the main cable and the surface of the branch cable are heat-shrunk by baking, and the baking temperature is 380±30°C.

[0024] Furthermore, the wire stripping machine described in S10 includes a fixed frame, a wire stripping mechanism is provided on the fixed frame, and the wire stripping mechanism includes a cable fixing cover, the cable fixing cover includes a fixed cover part one and a fixed cover part two, both ends of the fixed cover part one are provided with a first arc-shaped cutter, and both ends of the fixed cover part two are provided with a second arc-shaped cutter, the positions of the first arc-shaped cutter and the second arc-shaped cutter correspond to each other, the inner side of the fixed cover part one is provided with a first cutter, and the inner side of the fixed cover part two is provided with a second cutter, and the opposing surfaces of the fixed cover part one and the fixed cover part two are provided with a pushing mechanism for driving the fixed cover part one and the fixed cover part two to move relatively closer or farther away, and under the drive of the pushing mechanism, the fixed cover part one and the fixed cover part two are relatively closer or farther away, and the first cutter and the second cutter are relatively closer or farther away to cut the cable sheath.

[0025] Compared with the prior art, the advantages of the present invention include:

[0026] 1) The present invention provides a branching device for large-section trunk line confluence, wherein the connector adopts an irregular design and a two-side separated assembly type, which can be crimped to multiple branch cables and is easy to assemble;

[0027] 2) The present invention provides a large-section trunk line converging branching device, which has an accommodating cavity on the inner side wall of the connector to accommodate the branch cable and prevent the branch cable from being cut by the edge of the connector during crimping;

[0028] 3) The present invention provides a large-section trunk line converging splitter, wherein the outer protective shell is UV-resistant, waterproof, and flame-retardant, enabling the splitter to be used outdoors and extending its service life.

[0029] 4) The present invention provides a large-section trunk bus cable, wherein the terminal can connect two cables with cores of different materials together. It can directly convert other conductor materials for branch connections into aluminum conductor cables and connect them to the aluminum conductor cables running on the trunk line, thus realizing the connection of multiple aluminum conductors of different specifications.

[0030] 5) The present invention provides a method for manufacturing a large-section trunk bus cable, wherein two arc-shaped cutters and two straight-line cutters are provided on the fixed cover of the stripping machine. The two arc-shaped cutters cooperate to cut the surface of the cable in the radial direction, and the two straight-line cutters cooperate to cut the surface of the cable in the axial direction. The surface of the cable can be cut without rotating the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 This is a schematic diagram of the overall structure of a large-section trunk line converging branch provided in a typical embodiment of the present invention;

[0033] Figure 2 is a structural schematic diagram of a first connecting portion of a connecting member;

[0034] Figure 3 is a schematic structural diagram of the second connecting portion of the connecting member;

[0035] Figure 4 is a schematic diagram of the cooperation between the first connecting portion and the second connecting portion;

[0036] Figure 5 It is a structural diagram of embodiment 1;

[0037] Figure 6 This is the first schematic diagram of the connection between the main cable and two branch cables;

[0038] Figure 7 This is the second schematic diagram of the connection between the main cable and two branch cables;

[0039] Figure 8 This is the third schematic diagram of the connection between the main cable and two branch cables;

[0040] Figure 9 This is the fourth schematic diagram of the connection between the main cable and two branch cables;

[0041] Figure 10This is the first schematic diagram of the connection between the main cable and three branch cables;

[0042] Figure 11 This is the second schematic diagram of the connection between the main cable and three branch cables;

[0043] Figure 12 This is the third schematic diagram of the connection between the main cable and three branch cables;

[0044] Figure 13 This is the fourth schematic diagram of the connection between the main cable and three branch cables;

[0045] Figure 14 This is the first schematic diagram of the connection between the main cable and four branch cables;

[0046] Figure 15 This is the second schematic diagram of the connection between the main cable and four branch cables;

[0047] Figure 16 This is the third schematic diagram of the connection between the main cable and four branch cables;

[0048] Figure 17 This is the fourth schematic diagram of the connection between the main cable and four branch cables;

[0049] Figure 18 This is the first schematic diagram of the connection between the main cable and five branch cables;

[0050] Figure 19 This is the second schematic diagram of the connection between the main cable and five branch cables;

[0051] Figure 20 This is the first schematic diagram of the connection between the main line cable and the six branch cables;

[0052] Figure 21 This is the second schematic diagram of the connection between the main cable and the six branch cables;

[0053] Figure 22 This is the first schematic diagram of the connection between the main line cable and the seven branch cables;

[0054] Figure 23 This is the first schematic diagram of the connection between the main cable and eight branch cables;

[0055] Figure 24 It is a structural diagram of the wire stripping mechanism;

[0056] Figure 25 is a schematic diagram of the first curved cutter and the first cutter;

[0057] Figure 26 It is a cross-sectional view of a large-section trunk bus cable;

[0058] Figure 27 It is a cross-sectional view of AA;

[0059] Explanation of Reference Numerals: 1. Connector; 2. First Connecting Portion; 3. Second Connecting Portion; 4. Accommodating Chamber; 5. Connecting Groove; 6. Extension Portion; 7. Inner Protective Shell; 8. Outer Protective Shell; 9. Main Line Connecting Pipe; 10. Branch Line Connecting Pipe; 11. Large-Section Trunk Convergence Brancher; 12. Main Line Cable; 13. Branch Line Cable; 14. Terminal; 15. Fixed Cover (Part 1); 16. Fixed Cover (Part 2); 17. First Curved Cutter; 18. Second Curved Cutter; 19. First Cutter; 20. Second Cutter; 21. Pushing Mechanism; DETAILED DESCRIPTION

[0060] In view of the shortcomings of the prior art, the inventors of this case, after long-term research and extensive practice, have proposed the technical solution of the present invention. The following will further explain this technical solution, its implementation process and principles.

[0061] like Figure 1 As shown, on one hand, the present invention discloses a branching device for large-section trunk confluence, comprising a connector 1, an inner protective shell 7 and an outer protective shell 8. The connector 1 is used to crimp at least one branch cable 13 onto a main cable 12 to electrically connect the main cable 12 to the branch cable 13. For economic considerations, the material of the connector 1 is selected to be aluminum.

[0062] The connector 1 of the present invention can crimp one or more branch cables 13 onto the main cable 12. For example, the number of branch cables 13 crimped onto the main cable 12 can be one, two, four or eight. Figure 2 、 Figure 3 、 Figure 4As shown, the connector 1 includes a first connecting part 2 and a second connecting part 3. When crimped, the first connecting part 2 and the second connecting part 3 form a cavity, and at least one accommodating cavity 4 for accommodating a branch cable 13 is provided on the inner wall of the first connecting part 2 and / or the second connecting part 3; the number of the accommodating cavities 4 is set according to the number of branch cables 13 that need to be crimped. For example, when one branch cable 13 needs to be crimped on the main cable 12, one accommodating cavity 4 is provided on the inner wall of the connector 1; for another example, when eight branch cables 13 need to be crimped on the main cable 12, eight accommodating cavities 4 are provided on the inner wall of the connector 1. One, two, four, eight or more accommodating cavities 4 can be provided on the inner wall of the connector 1; the accommodating cavity 4 is used to accommodate the branch cable 13 to prevent the branch cable 13 from being cut by the edge of the connector 1 during crimping. A connection groove 5 is provided on the outer wall of the second connection part 3, and an extension part 6 is provided on the first connection part 2 at a position corresponding to the connection groove 5. After pressing, the extension part 6 is tightly connected to the connection groove 5, so that the first connection part 2 and the second connection part 3 are crimped together, and the main cable 12 and the branch cable 13 are crimped together. The inner protective shell 7 is provided on the outer surface of the connector 1, and the inner protective shell 7 covers the connector 1, part of the main cable 12, and part of the branch cable 13. The part of the main cable 12 mentioned here refers to the part of the main cable 12 whose skin is peeled off, that is, the part where the core is exposed. The part of the branch cable 13 mentioned here refers to the part of the branch cable 13 whose skin is peeled off, that is, the part where the core is exposed. The inner protective shell 7 is used to cover the connector 1 and the parts of the main cable 12 and the branch cable 13 where the core is exposed. The outer protective shell 8 is arranged on the outer surface of the inner protective shell 7 , and the outer protective shell 8 at least completely covers the inner protective shell 7 . The outer protective shell 8 is used to at least protect the connection between the connector 1 , the main cable 12 and the branch cable 13 .

[0063] The connector 1 in the present invention adopts an irregular design and a combined type with two separate sides, which can crimp multiple branch cables 13 and is easy to assemble; the connector 1 in the present invention is provided with a accommodating cavity 4, which can prevent the branch cable 13 from being cut by the edge of the connector 1 during crimping.

[0064] On the basis of the above, since the product is often bent during production, packaging and on-site installation, it is easy to cause the cable to separate from the outer protective shell 8, affecting the waterproof performance of the product. Therefore, outlet connection pipes are provided at both ends of the outer protective shell 8, such as Figure 1As shown, the outlet connection pipe includes a main line connection pipe 9 and a branch line connection pipe 10. The main line connection pipe 9 wraps the main line cable 12, which on the one hand enhances the flexibility between the outer protective shell 8 and the main line cable 12, and on the other hand has a waterproof effect between the outer protective shell 8 and the main line cable 12; the branch line connection pipe 10 wraps the branch cable 13, which on the one hand enhances the flexibility between the outer protective shell 8 and the branch cable 13, and on the other hand has a waterproof effect between the outer protective shell 8 and the branch cable 13. The material of the inner protective shell 7 is PP material or TPV material, which has flame retardant and waterproof effects. The material of the outer protective shell 8 is TPV material, which has UV resistance, waterproof and flame retardant effects, so that the splitter can be used in outdoor scenes and can extend the service life of the splitter.

[0065] like Figure 5-Figure 23 As shown, the present invention also discloses a large-section trunk bus cable, including a large-section trunk bus branch 11, a main line cable 12 and at least one branch cable 13 are arranged in the connector 1, the main line cable 12 and the branch cable 13 are crimped by the connector 1, the inner protective shell 7 is covered at the connection between the connector 1, the main line cable 12 and the branch cable 13, the outer protective shell 8 is arranged on the outer surface of the inner protective shell 7, the main line cable 12 passes through the main line connecting tube 9 and extends out of the main line connecting tube 9, the inner side of the main line connecting tube 9 The wall is tightly connected to the outer surface of the main line cable 12; the branch cable 13 passes through the branch connecting tube 10 and extends out of the branch connecting tube 10, and the inner wall of the branch connecting tube 10 is tightly connected to the outer surface of the branch cable 13; for economic and practical considerations, the core of the main line cable 12 is an aluminum core; the core of the branch cable 13 includes two cores of different materials, and the two cores of different materials are connected by a terminal 14, one of which is an aluminum core, and the aluminum core on the branch cable 13 is crimped with the aluminum core in the main line cable 12 through the connector 1.

[0066] Specifically, the terminal 14 includes a first connector, a second connector, and a connecting sleeve. The connecting sleeve is connected to the first connector and the second connector, respectively. The first connector is made of aluminum, and the aluminum core of the branch cable 13 is connected to the first connector. The second connector is made of a different material than the first connector and can be made of copper, silver, or other materials, depending on the material of the externally connected device. In one embodiment, the second connector is made of copper, and the branch cable 13 also includes a copper core. The copper core is located at the end of the branch cable 13 away from the aluminum core. The copper core of the branch cable 13 is connected to the second connector. The copper core and the aluminum core in the branch cable 13 are connected via the terminal 14. Since the connector on the photovoltaic panel is made of copper, the copper core is used to connect to the photovoltaic panel. For economic and practical reasons, the main cable 12 is configured with an aluminum core, and switching between the copper and aluminum cores is achieved via the terminal 14. More specifically, the aluminum core is welded or crimped to the first connector, and the copper core is welded or crimped to the second connector.

[0067] The terminal 14 in the present invention can connect two cables with cores of different materials together. It can directly convert other material conductors connected to the branch into aluminum conductor cables and connect them to the aluminum conductor cables running on the main line, thereby realizing the connection of multiple aluminum conductors of different specifications.

[0068] Example 1:

[0069] like Figure 5 As shown, a large-section trunk bus cable includes a brancher 11 for large-section trunk bus. A main line cable 12 and a branch line cable 13 are arranged in the connector 1. The main line cable 12 and the branch line cable 13 are crimped through the connector 1. A accommodating cavity 4 is provided on the connector 1, and the branch line cable 13 passes through the accommodating cavity 4; the inner protective shell 7 is covered at the connection between the connector 1, the main line cable 12 and the branch line cable 13, and the outer protective shell 8 is arranged on the outer surface of the inner protective shell 7. The main line cable 12 passes through the main line connecting tube 9 and extends out of the main line connecting tube 9, and the inner side wall of the main line connecting tube 9 is tightly connected to the outer surface of the main line cable 12; the branch cable 13 passes through the branch line connecting tube 10 and extends out of the branch line connecting tube 10, and the inner side wall of the branch line connecting tube 10 is tightly connected to the outer surface of the branch cable 13. The branch cable 13 includes an aluminum wire core and a copper wire core, which are connected by a terminal 14. The terminal 14 includes a first connector, a second connector and a connecting sleeve. The first connector is made of aluminum, and the second connector is made of copper. The aluminum wire core is welded or crimped to the first connector, and the copper wire core is welded or crimped to the second connector.

[0070] Example 2:

[0071] like Figure 6-Figure 9 As shown, the difference between this embodiment and embodiment 1 is that the large-section trunk bus cable includes a main line cable 12 and two branch cables 13, the connector 1 crimps the main line cable 12 and the two branch cables 13 together, and two accommodating cavities 4 are provided on the connector 1, and the two branch cables 13 pass through the two accommodating cavities 4 respectively.

[0072] Example 3:

[0073] like Figure 14-17 As shown, the difference between this embodiment and embodiment 1 is that the large-section trunk bus cable includes a main line cable 12 and four branch cables 13, the connector 1 crimps the main line cable 12 and the four branch cables 13 together, and four accommodating cavities 4 are provided on the connector 1, and the four branch cables 13 pass through the four accommodating cavities 4 respectively.

[0074] Example 4:

[0075] like Figure 23 As shown, the difference between this embodiment and embodiment 1 is that the large-section trunk bus cable includes a main line cable 12 and eight branch cables 13, the connector 1 crimps the main line cable 12 and the eight branch cables 13 together, and eight accommodating cavities 4 are provided on the connector 1, and the eight branch cables 13 pass through the eight accommodating cavities 4 respectively.

[0076] The present invention also discloses a method for manufacturing a large-section trunk bus cable, comprising the following steps:

[0077] S10, using a wire stripping machine to strip part of the outer covering of the main cable 12 and the branch cable 13, so that the core of the main cable 12 and the branch cable 13 to be connected is exposed;

[0078] S20, heat shrinking the skin at the edge where the skin is peeled off; specifically, the skin of the main cable 12 and the skin of the branch cable 13 are heat shrunk by baking, and the baking temperature is 380±30° C., and the baking temperature can be 350° C., 380° C., or 410° C. In this embodiment, the temperature of the cable skin is 380° C.;

[0079] S30, crimping the cores of the main cable 12 and the branch cable 13 together through the connector 1;

[0080] S40, using an injection molding machine to injection mold an inner protective shell 7 on the outer surface of the connector 1;

[0081] S50 , using an injection molding machine to injection-mold an outer protective shell 8 on the outer surface of the inner protective shell 7 .

[0082] Specifically, such as Figure 24-27As shown, the wire stripping machine includes a fixed frame, on which a wire stripping mechanism is provided, and the wire stripping mechanism includes a cable fixing cover, the cable fixing cover includes a fixed cover part and a fixed cover part 16, both ends of the fixed cover part 15 are provided with a first arc-shaped cutter 17, both ends of the fixed cover part 16 are provided with a second arc-shaped cutter 18, the positions of the first arc-shaped cutter 17 and the second arc-shaped cutter 18 correspond to each other, the inner side of the fixed cover part 15 is provided with a first cutter 19, the inner side of the fixed cover part 16 is provided with a second cutter 20, and the opposite surfaces of the fixed cover part 15 and the fixed cover part 16 are provided with a pushing mechanism 21 for driving the fixed cover part 15 and the fixed cover part 16 to move relatively close to or away from each other, and the fixed end of the pushing mechanism 21 is fixed Fixed on the fixed frame, the driving end of the pushing mechanism 21 is fixedly connected to the fixed cover part 15 or the fixed cover part 2 16. Under the drive of the pushing mechanism 21, the fixed cover part 15 and the fixed cover part 2 16 are relatively close to or away from each other, the first cutter 19 and the second cutter 20 are relatively close to or away from each other, and the first curved cutter 17 and the second curved cutter 18 are relatively close to or away from each other; under the drive of the pushing mechanism 21, the first curved cutter 17 and the second curved cutter 18 are relatively close to each other, and cooperate to cut the cable skin in the radial direction, that is, to perform an annular cutting on the cable skin; under the drive of the pushing mechanism 21, the first cutter 19 and the second cutter 20 are relatively close to each other, and cooperate to cut the cable in the axial direction, so that the cable skin is cut into two halves, which is convenient for removing the cut skin from the cable.

[0083] The pushing mechanism 21 can be a cylinder or a motor and a screw rod. In this embodiment, the pushing mechanism 21 includes a first cylinder and a second cylinder. The fixed end of the first cylinder is fixedly connected to the fixed frame, and the driving end of the first cylinder is fixedly connected to the first fixed cover; the fixed end of the second cylinder is fixedly connected to the fixed frame, and the driving end of the second cylinder is fixedly connected to the second fixed cover. Under the drive of the first cylinder and the second cylinder, the first fixed cover and the second fixed cover are relatively close or far away. When the cable needs to be stripped, the first cylinder and the second cylinder drive the first fixed cover and the second fixed cover to be relatively close synchronously, and at the same time, the first cutter 19 and the second cutter 20 are relatively close synchronously, and the first arc cutter 17 and the second arc cutter 18 are relatively close. Under the drive of the first cylinder and the second cylinder, the first arc cutter 17 and the second arc cutter 18 cooperate to cut the skin of the cable in the radial direction; the first cutter 19 and the second cutter 20 cooperate to cut the skin of the cable in the axial direction.

[0084] It should be understood that the above embodiments are merely illustrative of the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent variations or modifications made in accordance with the spirit and substance of the present invention are intended to be encompassed within the scope of protection of the present invention.

Claims

1. A branching device for large cross-section main line confluence, characterized in that: include A connector (1), the connector (1) being used for crimping at least one branch cable (13) onto a main cable (12) so as to electrically connect the main cable (12) and the branch cable (13); the connector (1) comprising a first connecting portion (2) and a second connecting portion (3), wherein the first connecting portion (2) and the second connecting portion (3) enclose a cavity when crimped, and at least one accommodating cavity (4) for accommodating the branch cable (13) is provided on the inner side wall of the first connecting portion (2) and / or the second connecting portion (3); a connecting groove (5) is provided on the outer side wall of the second connecting portion (3), and an extension portion (6) is provided at a position corresponding to the connecting groove (5) on the first connecting portion (2), and after crimping, the extension portion (6) is tightly connected to the connecting groove (5), so that the first connecting portion (2) and the second connecting portion (3) are crimped together, and the main cable (12) and the branch cable (13) are crimped together; An inner protective shell (7), the inner protective shell (7) being arranged on the outer surface of the connecting piece (1), the inner protective shell (7) covering the connecting piece (1), a portion of the main line cable (12) and a portion of the branch line cable (13); An outer protective shell (8), wherein the outer protective shell (8) is arranged on the outer surface of the inner protective shell (7), the outer protective shell (8) at least completely covers the inner protective shell (7), and the outer protective shell (8) is at least used to protect the connection between the connector (1), the main cable (12) and the branch cable (13).

2. A branching device for large cross-section main line confluence according to claim 1, characterized in that: Outlet connection pipes are provided at both ends of the outer protective shell (8), and the outlet connection pipes include a main line connection pipe (9) and a branch line connection pipe (10). The main line connection pipe (9) wraps around the main line cable (12) to enhance the flexibility between the outer protective shell (8) and the main line cable (12); and the branch line connection pipe (10) wraps around the branch line cable (13) to enhance the flexibility between the outer protective shell (8) and the branch line cable (13).

3. A branching device for large cross-section main line confluence according to claim 1, characterized in that: The connecting piece (1) is made of aluminum.

4. A branching device for large cross-section main line confluence according to claim 1, characterized in that: The inner protective shell (7) is made of PP material or TPV material; And / or, the outer protective shell (8) is made of TPV material.

5. A large cross-section trunk bus cable, characterized in that: A branching device (11) for large-section trunk confluence according to any one of claims 1 to 4, wherein a main line cable (12) and at least one branch line cable (13) are arranged in the connecting piece (1), the main line cable (12) and the branch line cable (13) are crimped by the connecting piece (1), the inner protective shell (7) is coated at the connection between the connecting piece (1), the main line cable (12) and the branch line cable (13), the outer protective shell (8) is arranged on the outer surface of the inner protective shell (7), the main line cable (12) passes through the main line connecting tube (9) and extends out of the main line connecting tube (9), the inner side wall of the main line connecting tube (9) is tightly connected to the outer surface of the main line cable (12); the branch line cable (13) passes through the branch line connecting tube (10) and extends out of the branch line connecting tube (10), the inner side wall of the branch line connecting tube (10) is tightly connected to the outer surface of the branch line cable (13); The wire core of the main line cable (12) is an aluminum wire core; the wire core of the branch line cable (13) includes wire cores made of two different materials, which are connected via a terminal (14), one of which is an aluminum wire core, and the aluminum wire core on the branch line cable (13) is crimped with the aluminum wire core in the main line cable (12) via a connector (1).

6. A large cross-section trunk bus cable according to claim 5, characterized in that: The terminal (14) comprises a first connector, a second connector and a connecting sleeve, the connecting sleeve being connected to the first connector and the second connector respectively, the first connector being made of aluminum, the aluminum wire core of the branch cable (13) being connected to the first connector, and the second connector being made of a material different from that of the first connector.

7. A large cross-section trunk bus cable according to claim 6, characterized in that: The second connector is made of copper, the branch cable (13) further comprises a copper wire core, the copper wire core is located at one end of the branch cable (13) away from the aluminum wire core, and the copper wire core of the branch cable (13) is connected to the second connector; And / or, the aluminum wire core is welded or crimped to the first connector, and the copper wire core is welded or crimped to the second connector.

8. A method for manufacturing a large cross-section trunk bus cable, characterized in that: The following steps are included: S10, using a wire stripping machine to strip part of the outer skin of the main cable (12) and the branch cable (13), so that the wire core of the part where the main cable (12) and the branch cable (13) need to be connected is exposed; S20, performing heat shrinkage treatment on the edge of the skin where the skin is peeled off; S30, crimping the wire core of the main line cable (12) and the wire core of the branch line cable (13) together through the connector (1); S40, using an injection molding machine to injection mold an inner protective shell (7) on the outer surface of the connecting piece (1); S50, using an injection molding machine to injection mold an outer protective shell (8) on the outer surface of the inner protective shell (7).

9. The method for manufacturing a large-section trunk bus cable according to claim 8, characterized in that: In S20, the surface of the main cable (12) and the surface of the branch cable (13) are heat-shrunk by baking, and the baking temperature is 380±30°C.

10. The method for manufacturing a large-section trunk bus cable according to claim 8, characterized in that: The wire stripping machine in S10 comprises a fixed frame, on which a wire stripping mechanism is arranged, and the wire stripping mechanism comprises a cable fixing cover, and the cable fixing cover comprises a fixing cover part (15) and a fixing cover part (16), both ends of the fixing cover part (15) are provided with a first arc-shaped cutter (17), and both ends of the fixing cover part (16) are provided with a second arc-shaped cutter (18), the positions of the first arc-shaped cutter (17) and the second arc-shaped cutter (18) correspond to each other, and the first cutter is arranged on the inner side of the fixing cover part (15). (19), a second cutter (20) is arranged on the inner side of the second fixed cover part (16), and a pushing mechanism (21) for driving the first fixed cover part (15) and the second fixed cover part (16) to move relatively closer or farther away is arranged on the opposite surfaces of the first fixed cover part (15) and the second fixed cover part (16). Under the drive of the pushing mechanism (21), the first fixed cover part (15) and the second fixed cover part (16) move relatively closer or farther away, and the first cutter (19) and the second cutter (20) move relatively closer or farther away, so as to cut the surface of the cable.

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