Shielded cable lap joint switching structure and cable assembly

Abstract

The invention relates to a cable switching structure, in particular to a shielding cable lap joint switching structure and a cable assembly, the structure comprises a core wire pressing sleeve used for crimping exposed core wires of cables on two sides, and a bushing used for sleeving an outer sheath of a cable on one side, and the core wire pressing sleeve is used for crimping wires and wire skins of the core wires on the two sides. The core wire pressing sleeve is sleeved with a core wire protection heat shrink tube and is fixed in a heat shrink mode. The first shielding layer of the cable sleeved by the lining is turned outwards and sleeved outside the lining, the second shielding layer of the cable on the other side is sleeved on the turned first shielding layer, the shielding wire pressing sleeve is sleeved outside the second shielding layer, and the shielding wire pressing sleeve is located outside the lining and is connected on the second shielding layer, the first shielding layer, the lining and the cable outer sheath in a pressing mode. The shielding wire pressing sleeve and the second shielding layer are sleeved with a cable anti-skid heat shrink tube and are fixed in a heat shrink mode. The cable assembly comprises two sections of cables which are connected through the structure. The length and the outer diameter of the switching structure can be reduced, and interference of human factors is reduced.

Description

Technical Field

[0001] The invention relates to a cable transfer structure, in particular to a shielded cable splicing transfer structure and a cable assembly. Background Art

[0002] During maintenance and repair of data bus cables, connectors are required to terminate the twisted-pair shielded cables on both sides of the cable disconnection point. Both the core and shield must be terminated simultaneously, achieving 360° shielding. Furthermore, the cable is laid and used on equipment, and the laying path requires bending. Therefore, the splice locations need to be relatively flexible to facilitate bending and possess a certain tensile strength to prevent breakage.

[0003] To achieve this effect, the existing technology mainly adopts two solutions:

[0004] The first method: Use a dead joint to terminate the core wires on both sides of the disconnection point, and then put on the wave-proof sleeve as a whole. The wave-proof sleeve is set on the shielding layer on both sides of the disconnection point. The overlap of the wave-proof sleeve and the shielding layer are tinned. The outer layer of the overlap area is covered with heat shrink tubing and heat-shrunk. Figure 1 shown.

[0005] The second method: Use a special shielded dead joint to transfer the shielded twisted pair cable. The transfer of the core wire is the same as the first solution, and a dead joint is used for transfer. The shielding adopts a blow-welding type shielding net with a heat shrink tube for hot air gun heating and welding. Specifically: the two ends of the shielding net are set on the shielding layer on both sides of the disconnection point, and pre-set solder is set at both ends of the shielding net. The pre-set solder is set on the outer surface of the shielding layer to protect the tube from heat shrinkage.

[0006] The above two methods have the following defects:

[0007] ① In the prior art, the overlap length at the cable disconnection position is long, the outer diameter size at the cable overlap position is large, and the cable is not convenient to bend at the bending position during laying; specifically, the core wire dead joint used for transfer uses a hard insulating sheath to protect the core wire. The hard insulating sheath at the core wire transfer position plus the size of the core wire results in a larger outer diameter size at the core wire transfer position. Due to the large outer diameter size at the core wire transfer position, the transfer positions of each core wire need to be staggered with each other during transfer so that the core wires in the cable can be set according to the standard. The cable contains multiple core wires, and the transfer positions of multiple core wires need to be staggered, resulting in a long overlap length at the cable overlap position, and each core wire is protected by a hard insulating sheath and plus the outer diameter size of the core wire, resulting in the overall outer diameter size of the cable overlap position being too large, which is inconvenient to bend during laying.

[0008] ② Cable shielding mainly achieves electromagnetic shielding effect. The shielding overlapping methods of the first and second methods involve bundling, soldering with a soldering iron, blow welding and other processes that are highly dependent on people, which consumes manpower, and has low operation convenience and reliability, which is not conducive to automation and thus not conducive to improving production efficiency. Summary of the Invention

[0009] In order to solve the above technical problems, the present invention provides a shielded cable splicing and transition structure and a cable assembly.

[0010] The purpose of the present invention is to be achieved by adopting the following technical solutions. According to the present invention, a shielded cable splicing and transition structure is proposed, which includes a core wire crimping sleeve for crimping the exposed core wires of the cables on both sides, and a bushing for being sleeved on the outer sheath of the cable on one side. The core wire crimping sleeve is used to be crimped on the conductors and wire sheaths of the core wires on both sides, and a core wire protection heat shrink tube is sleeved on the outside of the core wire crimping sleeve and fixed by heat shrinkage; the first shielding layer of the cable sleeved by the bushing is sleeved on the outside of the bushing, and the second shielding layer of the cable on the other side is sleeved on the outward-turned first shielding layer, and a shielding crimping sleeve is sleeved on the outside of the second shielding layer. The shielding crimping sleeve is located on the outside of the bushing and crimped on the second shielding layer, the first shielding layer, the bushing and the outer sheath of the cable, and a cable anti-slip heat shrink tube is sleeved on the outside of the shielding crimping sleeve and the second shielding layer and fixed by heat shrinkage.

[0011] Furthermore, the inner hole of the core wire crimping sleeve includes a wire crimping hole in the middle that matches the wire and a wire sheath crimping hole at both ends that matches the wire sheath.

[0012] Furthermore, the wire sheath is removed from the end of the core wire to expose the conductor, and a stepped axis is formed at the end of the core wire. The core wire crimping sleeve is a stepped crimping sleeve, and the diameter of the wire crimping hole is smaller than the diameter of the wire sheath crimping hole. A step is formed between the wire crimping hole and the wire sheath crimping hole to match the step on the stepped axis.

[0013] Furthermore, when the end of the core wire is inserted into the stepped wire crimping sleeve, the stepped stopper cooperates to achieve positioning.

[0014] Furthermore, the second shielding layer is straightened and sleeved on the turned-out first shielding layer.

[0015] Furthermore, the shielding crimping sleeve slides over the outside of the second shielding layer and is then sleeved on the outside of the bushing, the first shielding layer and the second shielding layer.

[0016] Furthermore, an anti-slip groove is provided on the outer wall of the bushing.

[0017] A cable assembly comprises two sections of cable connected to each other, wherein the two sections of cable are connected via the shielded cable overlapping transition structure.

[0018] Compared with the prior art, the present invention is beneficial in that:

[0019] The core wire crimping sleeve of the present invention can ensure the strength of use, so the outside of the core wire crimping part only uses thinner and shorter heat shrinkable materials for protection and sealing, that is, the core wire protection heat shrinkable tube is sheathed on the outside of the core wire crimping sleeve after crimping and on the outside of the core wire close to the core wire crimping sleeve and heat-shrunk, which can effectively shorten the length of the transition structure between the core wires on both sides. The length is more than 30mm shorter than the existing ordinary twisted pair shielded overlap structure.

[0020] The core wire crimping structure (including the core wire crimping sleeve and the core wire protective heat shrink tube) in this application is short in length and small in outer diameter. Multiple core wires in the cable adopt the core wire crimping structure, which does not need to be staggered too much. The overlap length at the cable disconnection position can be reduced, and the outer diameter at the overlap position can be reduced, which is convenient for bending during laying.

[0021] The shielding crimping structure (including bushings and shielding crimping sleeves) is used to achieve conduction and connection fixation of the shielding layers on both sides of the disconnection point, thereby realizing full shielding at the cable termination position. The shielding crimping structure fixes the shielding layers on both sides by crimping, and does not involve processes that are highly dependent on people, such as bundling, soldering with a soldering iron, and blow welding. It is not affected by human factors, and the crimping force is controlled by the crimping tool to achieve crimping standardization and ensure reliable connection.

[0022] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, which can be implemented in accordance with the contents of the specification, and to make the objects, features and advantages of the present invention more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a structural diagram of the prior art where the core wires of the cable are disconnected, where a dead joint is connected, the shielding layer is sheathed with a wave-proof sleeve, bundled and spot-welded, and the outer layer is sheathed with a heat shrink tube for termination;

[0024] Figure 2 This is a structural diagram of the prior art where the core wires of the cable are disconnected using a dead joint transfer, and the shielding layer is terminated using a blow-welded shielding net with a heat shrink tubing and pre-soldering;

[0025] Figure 3 It is a cross-sectional schematic diagram of an embodiment of a shielded cable splicing and transition structure of the present invention;

[0026] Figure 4 for Figure 3 Schematic cross-section of the core wire crimping structure;

[0027] Figure 5 for Figure 3 Schematic cross-section of the shield crimping structure.

[0028] Reference numerals:

[0029] 1-core wire,

[0030] 101-wire,

[0031] 102-line skin,

[0032] 2- Dead joint,

[0033] 3- Shielding layer,

[0034] 4- Anti-wave cover,

[0035] 5-Heat shrink tubing,

[0036] 6- Blow-weld type shielding mesh with heat shrink tubing,

[0037] 7-Pre-solder,

[0038] 8-cable,

[0039] 9-Shield crimping structure,

[0040] 901-first shielding layer,

[0041] 902-Second shielding layer,

[0042] 903-Bushing,

[0043] 904-Shielded crimping sleeve,

[0044] 905-anti-slip groove,

[0045] 10- Cable protection heat shrink tube,

[0046] 11-core wire crimping structure,

[0047] 1101-Step crimping sleeve,

[0048] 11011-wire crimping hole,

[0049] 11012-wire crimping hole,

[0050] 1102-core wire protection heat shrink tubing,

[0051] 12-Outer sheath. DETAILED DESCRIPTION

[0052] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0053] An embodiment of a shielded cable splicing and transition structure of the present invention is as follows: Figures 3 to 5 As shown, this structure is used to terminate cables on both sides of a shielded cable disconnection point. In this embodiment, a twisted-pair shielded cable is used for illustration, hereinafter referred to as cable 8. Cable 8 is provided with multiple core wires 1, and the outer sides of the multiple core wires 1 are provided with a shielding layer and an outer sheath 12 in sequence.

[0054] The structure adopted by the present invention includes a shield crimping structure 9, a core wire crimping structure 11, and a cable protection heat shrink tube 10. Figure 3 The core wire crimping structure 11 includes a step wire crimping sleeve 1101 and a core wire protection heat shrink tube 1102. Figure 4 The shielding crimping structure 9 includes a bushing 903 and a shielding crimping sleeve 904. Figure 5 shown.

[0055] The core wires 1 on both sides of the cable disconnection point are terminated using a core wire crimping structure 11. The core wire 1 includes a conductor 101 and a wire sheath 102 sleeved on the outside of the conductor 101. The core wire crimping structure 11 includes a stepped crimping sleeve 1101 for directly crimping the core wire 1 and a core wire protection heat shrink tube 1102 for protecting the termination position.

[0056] The sheath 102 is removed from the end of the core wire 1 to expose the conductor 101 . The sheath 102 has a certain thickness. Therefore, the sheath 102 and the conductor 101 form a stepped axis, and a step is formed between the sheath 102 and the conductor 101 .

[0057] The ends of the corresponding core wires 1 in the cables on both sides of the cable disconnection point are close to each other, and a stepped wire crimping sleeve 1101 is used to cover the ends of the core wires 1 on both sides.

[0058] The step wire crimping sleeve 1101 is set as a stepped structure, and the holes inside the step wire crimping sleeve 1101 are divided into a wire crimping hole 11011 located in the middle part and a wire skin crimping hole 11012 located at both ends. The diameter of the wire crimping hole 11011 is smaller than the diameter of the wire skin crimping hole 11012, so that a step is formed between the wire skin crimping hole 11012 and the wire crimping hole 11011.

[0059] After the stepped wire crimping sleeve 1101 is put on the ends of the core wires 1 on both sides of the disconnection point, the wire sheath crimping holes 11012 at both ends of the stepped wire crimping sleeve 1101 match the wire sheath 102 near the ends of the core wire 1, and the wire crimping holes 11011 in the middle part of the stepped wire crimping sleeve 1101 simultaneously match the exposed wires 101 of the core wires 1 on both sides of the disconnection point. The steps at both ends of the stepped wire crimping sleeve 1101 match the steps on the corresponding core wires 1 at both ends, and then the stepped wire crimping sleeve 1101 is crimped using a crimping tool, so that the middle part of the stepped wire crimping sleeve 1101 is crimped to the wire 101 and the two ends are crimped to the wire sheath 102, thereby achieving reliable connection of the core wires 1 on both sides of the disconnection point and bending resistance after connection.

[0060] The stepped wire crimping sleeve 1101 can realize electrical connection of the core wires 1 on both sides. After the core wires 1 on both sides are connected, the stepped wire crimping sleeve 1101 is simultaneously crimped onto the conductors 101 of the core wires 1 on both sides to realize reliable conduction of the conductors 101. The stepped wire crimping sleeve 1101 of the present invention is crimped on the wire 101 and the wire sheath 102 at the same time. In the prior art, the crimping sleeve only crimps the wire 101. In order to increase the crimping strength, the crimping sleeve usually has a larger outer diameter, and a hard insulating sleeve is provided on the outside of the crimping sleeve. In addition to protecting the crimping position, the hard insulating sleeve also needs to improve the tensile strength of the wire sheaths on both sides. Therefore, the hard insulating sleeve needs to increase the thickness. Therefore, the outer diameter at the crimping position in the prior art is larger. The stepped wire crimping sleeve 1101 of the present invention has a longer matching length with the core wire 1, and the stepped wire crimping sleeve 1101 is matched with the core wire 1 as a whole, and the connection strength is higher. The thickness of the stepped wire crimping sleeve 1101 can be reduced, and the outer diameter at the crimping position can be reduced. At the same time, the connection strength of the core wires 1 on both sides of the disconnection point of the present invention is higher, and the tensile strength is stronger.

[0061] Therefore, the stepped wire sleeve 1101 in the core wire crimping structure 11 of the present invention can ensure the strength of use, so the outer side of the core wire 1 crimping part is only protected and sealed with a thinner and shorter heat shrink material, that is, the outer side of the stepped wire sleeve 1101 after crimping and the outer side of the core wire 1 near the stepped wire sleeve 1101 are covered with a core wire protection heat shrink tube 1102 and heat shrunk. Figure 4 As shown, the length of the transition structure between the core wires 1 on both sides can be effectively shortened, and the length is more than 30 mm shorter than the existing ordinary twisted pair shielded overlapping structure.

[0062] Therefore, the core wire crimping structure 11 in the present application is short in length and small in outer diameter. Multiple core wires 1 in the cable all adopt the core wire crimping structure 11, and do not need to be staggered too much. The overlapping length at the cable disconnection position can be reduced, and the outer diameter at the overlapping position can be reduced, which is convenient for bending during laying.

[0063] The shielding layers of the cables on both sides of the disconnection point adopt a shielding crimping structure 9 to realize the crimping transfer of the shielding layers in the cables on both sides and ensure the conductivity and connection reliability of the shielding layers. The shielding crimping structure includes a bushing 903 and a shielding crimping sleeve 904. Figure 5 shown.

[0064] After the cable ends are stripped, the core wire 1 and the shielding layer are exposed. The shielding layer of the cable on one side of the disconnection point is the first shielding layer 901 , and the shielding layer of the cable on the other side is the second shielding layer 902 .

[0065] Sleeve the sleeve 903 on the outer circumference of the cable where the first shielding layer 901 is located, turn the first shielding layer 901 outward to the outside of the sleeve 903 and cover the sleeve 903, straighten the second shielding layer 902 and sleeve its end on the outside of the turned-out first shielding layer 901, then sleeve the shielding crimping sleeve 904 on the outside of the end of the second shielding layer 902 and locate it on the outside of the sleeve 903, use a crimping tool to crimp the shielding crimping sleeve 904, crimp and fix the first shielding layer 901 and the second shielding layer 902, and at the same time fix the first shielding layer 901 and the second shielding layer 902 between the sleeve 903 and the shielding crimping sleeve 904 and fix them on the outer sheath of the cable where the sleeve 903 is located.

[0066] The shielding crimping structure 9 is used to achieve conduction and connection fixation of the shielding layers on both sides of the disconnection point, thereby realizing full shielding at the cable termination position. The shielding crimping structure 9 fixes the shielding layers on both sides by crimping, and does not involve processes such as bundling, soldering with a soldering iron, and blow welding that are highly dependent on humans. It is not affected by human factors, and the crimping force is controlled by the crimping tool to achieve crimping standardization and ensure reliable connection.

[0067] In order to increase the bonding strength between the bushing 903 and the shielding layer, the outer wall of the bushing 903 is provided with an anti-slip groove 905. The outer wall of the bushing 903 is distributed with multiple anti-slip grooves 905 in the axial direction. After crimping, the shielding layer can be embedded in the anti-slip groove 905. The shielding layer is firmly fixed by the anti-slip groove 905 to increase the tensile strength.

[0068] After the shielding crimping structure 9 is crimped, a cable protection heat shrink tube 10 is placed on the outside of the disconnection point and heat-shrunk. The cable outer sheath, shielding crimping structure 9, and exposed shielding layer near the disconnection point are wrapped in the cable protection heat shrink tube 10 to protect the termination position.

[0069] The splicing and transfer process of the shielded cable in the present invention is summarized as follows:

[0070] Prepare two sections of cable on both sides of the disconnection point, put the bushing 903 on the outer sheath 12 of the cable 8 on one side, and put the shielding crimping sleeve 904 and the cable protection heat shrink tube 10 on the outer sheath 12 of the cable on the other side.

[0071] Peel off the outer sheath 12 and shielding layer of the cable ends on both sides to an appropriate length to expose the core wire 1, and peel off the wire sheath 102 at the end of the core wire 1 to expose the conductor 101, first put the core wire protection heat shrink tube 1102 on one of the core wires 1, and then insert the core wires 1 on both sides into the inside of the stepped wire crimping sleeve 1101 at both ends until the step on the core wire 1 rests on the step inside the stepped wire crimping sleeve 1101 to achieve positioning, crimp after inserting into place, and use two stepped wire crimping sleeves 1101 to realize the transfer of the two-core cables, where the two wire sheaths 102 of the core wires 1 on both sides need to be crimped through the stepped wire crimping sleeve 1101. After crimping is completed, the core wire protection heat shrink tube 1102 is installed outside the stepped wire crimping sleeve 1101 and heat-shrunk.

[0072] The first shielding layer 901 of the cable covered by the bushing 903 is turned outward on the outside of the bushing 903, and the second shielding layer 902 of the cable on the other side is straightened and covered on the outside of the first shielding layer 901 and the bushing 903. The shielding crimping sleeve 904 is pushed along the second shielding layer 902 to the outside of the end of the second shielding layer 902 and is located outside the bushing 903. While pushing the shielding crimping sleeve 904, the second shielding layer 902 is further straightened and flattened. The shielding crimping sleeve 904 is crimped to achieve compression and fixation of the shielding layer and connection of the shielding layer. The shielding layer is trimmed, and the cable protective heat shrink tube 10 is pushed to the outside of the shielding crimping sleeve 904 and the second shielding layer 902 and heat-shrunk to achieve overlapping and transfer of the shielded cable.

[0073] The splicing and switching process of the cable of the present invention is not limited to the above sequence, and the sequence can be adjusted as needed.

[0074] In other embodiments of the shielded cable splice adapter structure of the present invention, the stepped crimping sleeve 1101 can be replaced with an ordinary core wire crimping sleeve, which has a straight hole inside and can be made of a material with good plasticity. During crimping, the core wire crimping sleeve can still be crimped simultaneously with the conductor 101 and the cable sheath 102. Alternatively, the inner diameter of the core wire crimping sleeve gradually decreases from the outer diameter to the inner diameter.

[0075] An embodiment of a cable assembly using the shielded cable splicing and transitioning structure of the present invention includes at least two sections of cable, and the two interconnected sections of cable are spliced and transitioned through the shielded cable splicing and transitioning structure.

[0076] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and alterations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A shielded cable splicing and transfer structure, characterized by: The invention comprises a core wire crimping sleeve for crimping exposed core wires (1) of cables on both sides, and a sleeve (903) for sleeved on the outer sheath of the cable on one side. The core wire crimping sleeve is used to crimp the wires (101) and the wire sheath (102) of the core wires (1) on both sides. A core wire protection heat shrink tube (1102) is sleeved on the outer side of the core wire crimping sleeve and fixed by heat shrinkage. The first shielding layer (901) of the cable sleeved by the sleeve (903) is turned outward and sleeved on the outer side of the sleeve (903). The first shielding layer (901) of the cable sleeved by the sleeve (903) is turned outward and sleeved on the outer side of the sleeve (903). The second shielding layer (902) is sleeved on the first shielding layer (901) turned outward, a shielding crimping sleeve (904) is sleeved on the outside of the second shielding layer (902), the shielding crimping sleeve (904) is located on the outside of the bushing (903) and is crimped onto the second shielding layer (902), the first shielding layer (901), the bushing (903) and the cable outer sheath, and a cable anti-slip heat shrink tube (10) is sleeved on the outside of the shielding crimping sleeve (904) and the second shielding layer (902) and is fixed by heat shrinking.

2. The shielded cable splicing and transition structure according to claim 1, characterized in that: The inner hole of the core wire crimping sleeve comprises a wire crimping hole (11011) in the middle that matches the wire (101) and wire sheath crimping holes (11012) at both ends that match the wire sheath (102).

3. The shielded cable splicing and transition structure according to claim 2, characterized in that: The end of the core wire (1) is stripped of the wire sheath (102) to expose the conductor (101); the end of the core wire (1) forms a stepped shaft; the core wire crimping sleeve is a stepped crimping sleeve (1101); the diameter of the conductor crimping hole (11011) is smaller than the diameter of the wire sheath crimping hole (11012); and a step matching the step on the stepped shaft is formed between the conductor crimping hole (11011) and the wire sheath crimping hole (11012).

4. The shielded cable splicing and transition structure according to claim 3, characterized in that: When the end of the core wire (1) is inserted into the stepped wire pressing sleeve (1101), positioning is achieved through step-stopping engagement.

5. The shielded cable splicing and transition structure according to claim 1, characterized in that: The second shielding layer (902) is straightened and sleeved on the turned-out first shielding layer (901).

6. The shielded cable splicing and transition structure according to claim 5, characterized in that: The shielding crimping sleeve (904) slides over the outside of the second shielding layer (902) and is then sleeved on the outside of the bushing (903), the first shielding layer (901), and the second shielding layer (902).

7. The shielded cable splicing and transition structure according to claim 1, characterized in that: The outer wall of the bushing (903) is provided with an anti-slip groove (902).

8. A cable assembly comprising two interconnected cable segments, characterized in that: The two sections of cable are connected by the shielded cable splicing transition structure described in any one of claims 1 to 7.

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