Radiation-resistant Insulated Shielded Signal Cable and Manufacturing Method

Abstract

Radiation-resistant insulated shielded signal cable and manufacturing method, including multiple cores in the center of the cable. A mica winding layer is wrapped outside the cores. The multiple cores are wrapped by a first filling layer. An armor layer is provided outside the first filling layer. A second filling layer is provided outside the armor layer. A flame-retardant sheath is provided outside the second filling layer. A shielding layer is provided outside the flame-retardant sheath. The shielding layer is divided into upper and lower layers and is formed by connecting a metal strip or wire up and down through left and right fastening terminals on both sides. The left and right fastening terminals are conductors, and the metal strip or wire is arranged in a staggered manner. By using connection terminals to fasten the metal shielding layer in the form of upper and lower two segments for use, it can be laid flat for production, greatly reducing the production difficulty of the metal shielding layer, abandoning the original production mode of the winding machine. Through the combined mode, the shielding layer can be mass-produced in large quantities, and the combined components are segmented parts with the same symmetric arrangement, greatly reducing the production difficulty.

Description

Technical Field

[0001] The present invention relates to the technical field of cable production equipment, and particularly relates to a radiation-resistant insulated shielded signal cable and a manufacturing method thereof. Background Art

[0002] In some applications with high protection and safety levels, such as nuclear power plants, undersea communications, communication centers, and medical communications, in addition to ensuring that the cable is at a high safety level, the cable is also required to resist external signal interference, especially to prevent signal distortion caused by external radiation. The most direct approach is to wrap a layer of metal braid around the cable to form a Faraday cage. In addition to being able to shield external signals, the intertwined structure of the metal braid gives it good toughness and resistance to sharp objects. This method of wrapping the cable with a metal braid is widely used in the cable field.

[0003] To manufacture the metal braid for wrapping the cable, a winding machine needs to continuously rotate around the cable to exchange positions for weaving. When the number of cores of the communication cable is large or the power is high, the cable diameter itself is huge. Coupled with the winding movement of the winding machine, it occupies a large space and is expensive, making the cost of the cable extremely high. In some applications of shielded cables, their placement positions are fixed and the forces are also fixed. They do not require the metal braid to provide full-directional protection. If a shielding sleeve that can both shield signals and provide protection at specific positions can be manufactured without a large winding machine, the cost of the shielded cable can be significantly reduced. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a radiation-resistant insulated shielded signal cable and a manufacturing method thereof, which can produce the signal shielding layer of the cable in a simpler manner, enabling large-scale production, improving production efficiency, and reducing production costs.

[0005] To solve the above technical problem, the technical solution adopted by the present invention is:

[0006] The radiation-resistant insulated shielded signal cable includes multiple cores at the center of the cable. A mica winding layer is wrapped around the cores. The multiple cores are wrapped by a first filling layer. A layer of armor layer is provided outside the first filling layer. A second filling layer is provided outside the armor layer. A flame-retardant sheath is provided outside the second filling layer. A shielding layer is provided outside the flame-retardant sheath. The shielding layer is divided into upper and lower layers and is formed by connecting the upper and lower parts of a metal strip or wire through left and right snap terminals on both sides. The left and right snap terminals are conductors, and the metal strip or wire is arranged in a staggered manner.

[0007] In the above shielding layer along the axial direction of the cable, the staggered arrangements of the metal strips or wires in the upper and lower layers form intersections at the top and bottom respectively. Intersection connection terminals are provided at the intersection positions at the top and bottom.

[0008] In a preferred embodiment, the metal strips or wires of the upper and lower layers of the shielding layer are arranged in an interleaved manner, forming an interleaving at the top and bottom respectively. At the interleaved positions on both sides of the top and bottom, upper and lower connection terminals are provided to connect the two interleaved metal strips or wires. The upper and lower connection terminals can be connected in pairs left and right, and interleaved connection terminals are provided at the intermediate interleaved positions of the top and bottom.

[0009] In a preferred embodiment, in the axial direction of the cable, the metal strips or wires of the upper and lower layers of the shielding layer are arranged in an interleaved manner, forming an interleaving on both sides respectively. The interleaved positions on both sides are connected by left and right snap-in terminals, and the unfolded shielding layer is arranged in a diamond shape.

[0010] The manufacturing method of the above radiation-resistant insulated shielded signal cable comprises the following steps:

[0011] Step 1: Successively produce the core, mica winding layer, first filling layer, armor layer, second filling layer, and flame-retardant sheath.

[0012] Step 2: While performing Step 1, lay out the upper and lower semi-circular shielding layers in an interleaved manner on a flat production mold. The flat production mold has an interleaved pattern, and the metal strips or wires are arranged in an interleaved manner according to the pattern.

[0013] Step 3: At the intersection section of the interleaved metal strips or wires in the longitudinal middle of the flat production mold, the intersection points at both ends are connected by upper and lower connection terminals, and the intersection point in the middle is connected by an interleaved connection terminal.

[0014] Step 4: At the intersection section of the interleaved metal strips or wires at both longitudinal ends of the flat production mold, use left and right snap-in terminals to connect the intersection points, so that the semi-circular shielding layers form an integral whole.

[0015] When the above shielding layer wraps the cable body, the following steps are involved:

[0016] Step 5: First, place the manufactured semi-circular shielding layer on a semi-circular snap-in mold. The semi-circular snap-in mold has a pattern arranged according to the interleaving of the shielding layer, and the left and right snap-in terminals, upper and lower connection terminals, and interleaved connection terminals are detachably fixed. The left and right snap-in terminals and upper and lower connection terminals extend out of the semi-circular snap-in mold.

[0017] Step 6: Wrap the four manufactured semi-circular snap-in molds and the shielding layer as a whole around the cable body in the axial direction of the cable, up, down, left, and right. Then connect the upper and lower connection terminals opposite to each other on the left and right semi-circular snap-in molds, and connect the left and right snap-in terminals opposite to each other on the upper and lower semi-circular snap-in molds, so that the four semi-circular shielding layers form an integral segmented whole.

[0018] Step 7: When multiple cable segments are required, multiple integral segments are connected through upper and lower connection terminals to extend the length of the shielding layer.

[0019] In a preferred embodiment, when the shielding layer wraps the cable body, the following steps are involved:

[0020] Step 5: First, place the two fabricated semi-circular shielding layers on the ground under the cable body in a horizontally tiled manner. Then, place the two semi-circular shielding layers on top of the cable body, allowing the shielding layers to hang freely to form semi-circles. The horizontal positions of the two upper semi-circular shielding layers correspond to those of the two lower semi-circular shielding layers.

[0021] Step 6: Lift the left and right snap-in terminals on both sides of the two lower semi-circular shielding layers and connect and snap them with the left and right snap-in terminals on both sides of the directly opposite upper semi-circular shielding layers to form two complete shielding layers. Then, connect the upper and lower connection terminals between the two shielding layers to form an integral segment from the four semi-circular shielding layers.

[0022] Step 7: When multiple cable segments are required, multiple integral segments are connected through upper and lower connection terminals to extend the length of the shielding layer.

[0023] A radiation-resistant insulated shielded signal cable and manufacturing method provided by the present invention are composed of metal shielding layers that are buckled together in the form of upper and lower segments using connection terminals, enabling flat production, greatly reducing the production difficulty of the metal shielding layer, abandoning the original winding machine production mode, enabling large-scale batch production of the shielding layer through a combined mode, and the combined components being segment parts with the same symmetric layout, greatly reducing the production difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below with reference to the drawings and embodiments:

[0025] Figure 1 is a schematic structural diagram of the cable of the present invention Figure 1 ;

[0026] Figure 2 is a schematic structural diagram of the cable of the present invention Figure 2 ;

[0027] Figure 3 is a flat layout structure diagram of the semi-circular shielding layer;

[0028] Figure 4 is a preferred flat layout structure diagram of the semi-circular shielding layer;

[0029] Figure 5 is a combined diagram of the semi-circular snap-in mold and the shielding layer;

[0030] Figure 6 Schematic diagram of the shielding layer wrapping the cable body

[0031] Figure 7 Schematic diagram of the preferred shielding layer wrapping the cable body

[0032] Wherein: wire core 1, mica winding layer 2, first filling layer 3, armor layer 4, second filling layer 5, flame-retardant sheath 6, shielding layer 7, left and right snap terminals 8, upper and lower connection terminals 9, flat production die 10, staggered connection terminals 11, cable body 12, semi-circular snap die 13 Specific embodiments

[0033] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and embodiments

[0034] The radiation-resistant insulated shielded signal cable includes multiple wire cores 1 in the center of the cable. A mica winding layer 2 is wrapped outside the wire core 1. The multiple wire cores 1 are wrapped by a first filling layer 3. An armor layer 4 is provided outside the first filling layer 3. A second filling layer 5 is provided outside the armor layer 4. A flame-retardant sheath 6 is provided outside the second filling layer 5. A shielding layer 7 is provided outside the flame-retardant sheath 6. The shielding layer 7 is divided into upper and lower layers and is formed by connecting a metal strip or wire up and down through the left and right snap terminals 8 on both sides. The left and right snap terminals 8 are conductors, and the metal strip or wire is arranged in a staggered manner

[0035] As Figures 1-3 shown, the staggered metal strip or wire and the left and right snap terminals 8 form a Faraday cage outside the cable to shield external signals. The left and right snap terminals 8 on both sides enable the shielding layer 7 to be composed of the same upper and lower layers, so that the shielding layer 7 can be produced outside the cable and then snapped onto the cable. In this way, the production of the metal shielding layer can be achieved without a large winding machine. By laying the metal strip or wire flat, large-scale production can be realized. During production, only the metal strip or wire needs to be laid out flat according to the semi-circular staggered part of the winding, and then the left and right snap terminals 8 are connected on both sides. Then, the upper and lower flat semi-circular unfolded shielding layer 7 is snapped up and down through the left and right snap terminals 8 to form a complete circular shielding layer 7. Since the up and down snapping of the left and right snap terminals 8 is simple and does not require complex equipment and tools, the snapping part of the work can be completed by the laying personnel. The cost of this part of the work is converted into a reduction in the cable selling price, increasing the acceptance of cable users. Moreover, the shielding layer 7 can withstand forces in both the up and down directions. Strengthening the structural strength of the left and right snap terminals 8 makes the forces on both the left and right sides equal to those on the upper and lower sides. For cables that are always laid flat, no strengthening is required, and further cost reduction can be achieved according to requirements

[0036] The mica tape and the filling layer ensure the flame-retardant performance of the cable. The armor layer 4 enhances the structural strength of the cable and at the same time provides an internal signal shielding function for the wire core 1

[0037] The above-mentioned shielding layer 7 is arranged in a staggered manner with metal strips or wires in upper and lower layers along the cable axis direction, forming intersections at the top and bottom respectively, and intersection connection terminals 11 are provided at the intersection positions at the top and bottom.

[0038] As Figure 2 shown, when the outer side of the cable body 12 is composed of upper and lower layers, the cable body 12 is wrapped by fastening the upper and lower layers.

[0039] In a preferred solution, the above-mentioned shielding layer 7 is arranged in a staggered manner with metal strips or wires in upper and lower layers along the cable axis direction, forming intersections at the top and bottom respectively. Upper and lower connection terminals 9 are provided at the staggered positions on both sides at the top and bottom to connect two staggered metal strips or wires. The upper and lower connection terminals 9 can be connected in pairs left and right. Intersection connection terminals 11 are provided at the middle staggered positions at the top and bottom.

[0040] In a preferred solution, the above-mentioned shielding layer 7 is arranged in a staggered manner with metal strips or wires in upper and lower layers along the cable axis direction, forming intersections on both sides respectively. The staggered positions on both sides are connected by left and right fastening terminals 8, and the unfolded shielding layer 7 is arranged in a diamond shape.

[0041] For the shielding layer 7 arranged in a diamond shape when unfolded, the metal strips or wires are staggered in pairs, so that the same semi-circular shielding layer 7 can be connected up, down, left and right.

[0042] As Figure 4 and 6 shown, when the cable is long and needs to be spliced by multiple sections of the shielding layer 7, the two staggered metal strips or wires on the left and right sides of the upper and lower connection terminals 9 connected in pairs at both ends are used to form a whole for the four staggered metal strips or wires, and the middle part is wrapped and connected in four sections by the intersection connection terminals 11 for the two staggered metal strips or wires with the intersection point as the demarcation line.

[0043] When wrapping the cable body 12, first, the upper and lower shielding layers 7 are connected and fastened up and down by the left and right fastening terminals 8 to form multiple sections of the shielding layer 7, and then the multiple sections of the shielding layer 7 are horizontally connected and fastened by the upper and lower connection terminals 9.

[0044] The above-mentioned segmented shielding layer 7 in the up, down, left and right positions has the same structure and layout and is the same product. Therefore, only one kind of segmented semi-circular unfolded flat shielding layer 7 needs to be produced, which can achieve large-scale mass production.

[0045] The manufacturing method of the above-mentioned radiation-resistant insulated shielded signal cable has the following manufacturing steps:

[0046] Step 1: Sequentially produce the core 1, mica winding layer 2, first filling layer 3, armor layer 4, second filling layer 5 and flame-retardant sheath 6;

[0047] Step 2: While performing Step 1, lay out the upper and lower semi-circular shielding layers 7 in a staggered arrangement on the flat production mold 10. The flat production mold 10 has staggered patterns, and the metal strips or wires are arranged in a staggered manner according to the patterns.

[0048] Step 3: At the intersection section of the staggered arrangement of the metal strips or wires in the longitudinal middle of the flat production mold 10, the intersection points at both ends are connected by the upper and lower connection terminals 9, and the intersection points in the middle are connected by the staggered connection terminals 11.

[0049] Step 4: At the intersection section of the staggered arrangement of the metal strips or wires at both longitudinal ends of the flat production mold 10, use the left and right snap-together terminals 8 to connect the intersection points, so that the semi-circular shielding layer 7 forms an integral whole.

[0050] As Figure 6 shown, when the above-mentioned shielding layer 7 wraps the cable body 12, the following steps are involved:

[0051] Step 5: First, place the fabricated semi-circular shielding layer 7 on the semi-circular snap-together mold 13. The semi-circular snap-together mold 13 has patterns arranged in a staggered manner according to the shielding layer 7, and detachably fix the left and right snap-together terminals 8, the upper and lower connection terminals 9, and the staggered connection terminals 11. The left and right snap-together terminals 8 and the upper and lower connection terminals 9 extend out of the semi-circular snap-together mold 13.

[0052] Step 6: Take the four fabricated semi-circular snap-together molds 13 and the shielding layer 7 as a whole, and wrap the cable body 12 in the up-down, left-right directions along the cable axis. Then connect the upper and lower connection terminals 9 opposite to each other on the left and right semi-circular snap-together molds 13, and connect the left and right snap-together terminals 8 opposite to each other on the upper and lower semi-circular snap-together molds 13, so that the four semi-circular shielding layers 7 form an integral segment.

[0053] Step 7: When the cable length requires multiple segments, use multiple integral segments to be connected through the upper and lower connection terminals 9, thereby extending the length of the shielding layer 7.

[0054] Between the left and right segmented shielding layers 7, although only the upper and lower connection terminals 9 at the upper and lower two points are used for connection, it forms a stable diamond + arc connection structure with the left and right snap-together terminals 8 on the left and right sides, and the structure is very stable and reliable.

[0055] Preferably, as Figure 7 shown, when the above-mentioned shielding layer 7 wraps the cable body 12, the following steps are involved:

[0056] Step Five: First, place the two fabricated semi-circular shielding layers 7 on the ground under the cable body 12 in a horizontally tiled manner, and then place the two semi-circular shielding layers 7 on top of the cable body 12. The shielding layers 7 hang freely to form semi-circles, and the horizontal positions of the two semi-circular shielding layers 7 on top are opposite to the positions of the two semi-circular shielding layers 7 at the bottom;

[0057] Step Six: Lift the left and right fastening terminals 8 on both sides of the two semi-circular shielding layers 7 at the bottom and connect and fasten them to the left and right fastening terminals 8 on both sides of the semi-circular shielding layer 7 directly above to form two complete shielding layers 7. Then, connect the upper and lower connection terminals 9 between the two shielding layers 7 to make the four semi-circular shielding layers 7 form an integral segment;

[0058] Step Seven: When the cable length requires multiple segments, use multiple integral segments to be connected through the upper and lower connection terminals 9 to extend the length of the shielding layer 7.

[0059] This method does not require a semi-circular fastening mold 13 and is suitable for on-site production by laying personnel at the laying site. At the same time, by deducting this part of the cost from the cable cost, the selling price of the cable can be reduced, giving users more choices.

Claims

1. Radiation-resistant insulated shielded signal cable, characterized in that, It includes multiple cores (1) in the center of the cable. Each core (1) is wrapped with a mica winding layer (2). The multiple cores (1) are wrapped by a first filling layer (3). A layer of armor layer (4) is provided outside the first filling layer (3). A second filling layer (5) is provided outside the armor layer (4). A flame-retardant sheath (6) is provided outside the second filling layer (5). A shielding layer (7) is provided outside the flame-retardant sheath (6). The shielding layer (7) is divided into upper and lower layers and is formed by connecting metal tapes or wires up and down through left and right fastening terminals (8) on both sides. The left and right fastening terminals (8) are conductors, and the metal tapes or wires are arranged in a staggered manner; In the axial direction of the cable, the staggered arrangements of the metal tapes or wires in the upper and lower layers of the shielding layer (7) form intersections at the top and bottom respectively. Intersection connection terminals (11) are provided at the intersection positions at the top and bottom.

2. The radiation-resistant insulated shielded signal cable according to claim 1, wherein The staggered arrangements of the metal tapes or wires in the upper and lower layers of the shielding layer (7) form intersections at the top and bottom respectively. Upper and lower connection terminals (9) are provided at the staggered positions on both sides at the top and bottom to connect two staggered metal tapes or wires. The upper and lower connection terminals (9) can be connected in pairs left and right. Intersection connection terminals (11) are provided at the middle staggered positions at the top and bottom.

3. The radiation-resistant insulated shielded signal cable according to claim 2, characterized in that, In the axial direction of the cable, the staggered arrangements of the metal tapes or wires in the upper and lower layers of the shielding layer (7) form intersections on both sides respectively. The intersection positions on both sides are connected through left and right fastening terminals (8). The unfolded shielding layer (7) is arranged in a diamond shape.

4. The manufacturing method for the radiation-resistant insulated shielded signal cable according to claim 3 above, characterized in that, The manufacturing steps are as follows: Step 1: Produce the core (1), mica winding layer (2), first filling layer (3), armor layer (4), second filling layer (5) and flame-retardant sheath (6) in sequence; Step 2: While performing Step 1, lay out the upper and lower semi-circular shielding layers (7) on a flat production mold (10) in a staggered arrangement. The flat production mold (10) has staggered patterns, and the metal tapes or wires are arranged in a staggered manner according to the patterns; Step 3: At the intersection section of the staggered arrangement of the metal tapes or wires in the longitudinal middle of the flat production mold (10), the intersection points at both ends are connected by upper and lower connection terminals (9), and the intersection point in the middle is connected by intersection connection terminals (11); Step 4: At the intersection section of the staggered arrangement of the metal tapes or wires at both longitudinal ends of the flat production mold (10), use left and right fastening terminals (8) to connect the intersection points to form a whole shielding layer (7).

5. The manufacturing method of the radiation-resistant insulated shielded signal cable according to claim 4 above, characterized in that, When the shielding layer (7) wraps the cable body (12), the following steps are involved: Step 5: First, place the produced semi-circular shielding layer (7) on a semi-circular fastening mold (13). The semi-circular fastening mold (13) has patterns arranged in a staggered manner according to the shielding layer (7), and the left and right fastening terminals (8), upper and lower connection terminals (9) and intersection connection terminals (11) are detachably fixed. The left and right fastening terminals (8) and upper and lower connection terminals (9) extend out of the semi-circular fastening mold (13); Step Six: Wrap the four completed semi-circular fastening molds (13) and the shielding layer (7) as a whole around the cable body (12) in the cable axis direction, up, down, left, and right. Then connect the upper and lower connection terminals (9) of the left and right semi-circular fastening molds (13) that face each other, and connect the left and right fastening terminals (8) of the upper and lower semi-circular fastening molds (13) that face each other, so that the four semi-circular shielding layers (7) form an integral segment; Step Seven: When multiple segments are required for the cable length, use multiple integral segments to be connected through the upper and lower connection terminals (9) to extend the length of the shielding layer (7).

6. The manufacturing method of the radiation-resistant insulated shielded signal cable according to claim 4 above, characterized in that, When the shielding layer (7) wraps the cable body (12), the following steps are involved: Step Five: First, place the two completed semi-circular shielding layers (7) on the ground under the cable body (12) in a horizontally tiled manner. Then place the two semi-circular shielding layers (7) on top of the cable body (12). The shielding layers (7) hang freely to form semi-circles. The horizontal positions of the two upper semi-circular shielding layers (7) are opposite to the positions of the two lower semi-circular shielding layers (7). Step Six: Lift the left and right fastening terminals (8) on both sides of the two lower semi-circular shielding layers (7) and connect and fasten them with the left and right fastening terminals (8) on both sides of the upper semi-circular shielding layer (7) that faces them, forming two complete shielding layers (7). Then connect the upper and lower connection terminals (9) between the two shielding layers (7) so that the four semi-circular shielding layers (7) form an integral segment; Step Seven: When multiple segments are required for the cable length, use multiple integral segments to be connected through the upper and lower connection terminals (9) to extend the length of the shielding layer (7).

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