CN1085384C - cable manufacturing method - Google Patents

Abstract

A method for manufacturing a cable includes manufacturing a coaxial line, wherein a ground wire is wound around the coaxial line in a spiral manner according to a specific twisting moment to increase the feeding speed of the coaxial line when the ground wire is wound, thereby shortening the winding time; a metal shielding device is installed between the coaxial line and the ground wire or on the outer surface of the coaxial line and the ground wire, thereby reducing the manufacturing time and manufacturing cost of the shielding layer and not easily generating waste. The ground wire and the metal shielding device are completed at the same workstation, which can further reduce the working time and cost.

Description

cable manufacturing method

The invention relates to a cable manufacturing method, in particular to a cable manufacturing method which simplifies the manufacturing procedure and reduces man-hours and costs.

General cables have different structural designs according to different signal transmission functions. Commonly used cables for fluorescent screens include several different types of wires, such as axial lines (COAXIAL CABLE) and signal lines (SIGNAL CABLE), etc. (as shown in the figure 1A), wherein the coaxial line mostly transmits high-frequency signals such as three primary color signals, while the signal line transmits low-frequency signals. As for the existing cable manufacturing method, it can be divided into the following manufacturing procedures according to the coaxial line and signal line contained in the cable:

1. Manufacture of the coaxial cable: First, use an extrusion molding machine to coat the first insulating layer (such as polyethylene, PE) on the periphery of the thick bare copper wire; after the first insulating layer is cooled, use a braiding machine or roll The wire machine lays a layer of shielding layer composed of ground wire (usually copper wire braided mesh or copper wire twisted wire) on the outer surface of the first insulating layer, so that the polyethylene layer is completely isolated from the outside world; after that, reuse Another extrusion molding machine covers the outer surface of the shielding layer with a second insulating layer (such as polyvinyl chloride, PVC); after the second insulating layer is cooled, the manufacture of the coaxial line is completed (the structure can refer to Figure 1B ).

2. Manufacture of signal lines: The manufacture of signal lines is the same as the manufacturing process of the above-mentioned coaxial line being coated with an insulating layer by an extrusion molding machine. It also directly coats an insulating layer (usually polyvinyl chloride) on a thin bare The outer surface of the copper wire to complete the production of this signal wire.

3. Manufacture of cable wires: Send several completed coaxial cables and signal wires to the twisting machine, and twist them together with strip-shaped aluminum foil into bundles of twisted wires, wherein the aluminum foil is tightly wrapped on the The periphery of the coaxial line and the signal line. Then use a braiding machine to carefully lay a layer of braided mesh made of copper wires on the periphery of the bundled stranded wires to form a shielding protection for the stranded wires. Finally, the stranded wire provided with the braided net is sent to an extrusion molding machine, and a third insulating layer (such as polyvinyl chloride) is coated on the periphery of the stranded wire again. So far, the manufacturing process of the cable is completed (the structure can refer to FIG. 1A ). Yet the manufacturing method of aforementioned existing electric cable has following shortcoming:

A. The winding time of the ground wire is long. As mentioned earlier, the ground wire is carefully wound around the coaxial cable with a braiding machine or a winding machine. However, the degree of precision of its winding depends on whether the feed speed of the coaxial line on the braiding machine or winding machine is equal to the winding speed of the ground wire. Because when the feed speed of the coaxial line is equal to the winding speed of the ground wire, the ground wire can be evenly laid on the periphery of the coaxial line, but it also results in long winding hours of the ground wire; way, its winding man-hour will be longer.

B. The molding of the insulating layer takes a long time, the manufacturing cost is high, and waste is easily generated. When the coaxial cable is coated with an insulating layer, the feeding speed of the coaxial cable must be equal to the forming speed of the insulating layer to make the insulating layer evenly covered on the coaxial cable, so the forming time of the insulating layer is very long . Secondly, whether the forming of the insulating layer is complete or not is often limited by the stability of the feeding material, and the stability of the feeding material is related to factors that are difficult to control such as the moisture content of the raw material and the size of the material. Even if the moisture content and particle size of the raw materials are controlled in advance, that is, the raw materials are dried and screened before feeding, waste will still be generated during the molding process, but the amount of waste will be reduced compared to before; but relatively , which increases the drying and screening process, the manufacturing cost and raw material cost will therefore increase, making the molding time longer.

C. The winding of the ground wire and the forming of the insulating layer belong to different processing stations, because the winding of the ground wire on the coaxial line is completed at the braiding machine or winding machine, and the coating of the insulating layer is done at the extrusion molding The machine is completed, the two are completed at different workstations, and cannot be combined, so the man-hours cannot be reduced.

Aiming at the shortcomings of the existing cable manufacturing method, the main purpose of the present invention is to provide a cable manufacturing method, wherein the ground wire is wound around the coaxial cable with a specific twisting moment, so that the feeding of the coaxial cable The speed is increased and the winding time is shortened.

Furthermore, another object of the present invention is to provide a method for manufacturing cables, which uses aluminum foil instead of the existing second layer of insulating layer as the shielding layer, and replaces the molding coating with the winding method, eliminating the need for drying and screening processes .

The object of the present invention is achieved by providing a method for manufacturing cables, wherein the outer periphery of at least one coaxial line is to use a winding machine to wind the metal shielding device and the ground wire, so that the metal shielding device is in the inner layer of the winding layer layer and the ground wire is on the outer layer, or the metal shield is on the outer layer of the winding layer and the ground wire is on the inner layer.

The advantage of the method of the present invention is that in the method for manufacturing cables, the metal shielding device and the ground wire are wound on the coaxial line at the same workstation at the same time, which can further reduce manufacturing man-hours, and is not easy to generate waste materials and reduce production costs.

Embodiments of the present invention are described below in conjunction with the accompanying drawings, wherein:

Figure 1A is a perspective view of an existing cable;

Figure 1B is a perspective view of the coaxial line in Figure 1A;

Fig. 2 represents the manufacturing method of cable wire of the present invention, and it shows the process that coaxial line, ground wire and metal shielding device are combined into one;

Fig. 3A is a perspective view of a first embodiment of a cable manufactured by the cable manufacturing method of the present invention.

Fig. 3B is a perspective view of a second embodiment of a cable manufactured by the cable manufacturing method of the present invention.

Please refer to FIG. 1A , which is a perspective view of an existing cable. It includes a plurality of coaxial cables 5 and signal lines 7 . Referring again to FIG. 1B, it is a perspective view of the coaxial line 5 in FIG. 1A, and shows its internal structure, wherein the coaxial line 5 has a thick copper wire conductor 10, which is located at the center of the coaxial line 5; A layer of insulating layer 20 (such as foamed polyethylene, FOAM PE), which is wrapped around the periphery of the thick copper wire conductor 10; a plurality of ground wires 30 (such as thin bare copper wires), which are closely surrounding the first The periphery of the first insulating layer 20 ; the second insulating layer 40 (such as polyvinyl chloride, SR-PVC), which wraps the outer periphery of the ground wire 30 . The manufacturing method of existing electric cable has some disadvantages as mentioned above.

Please refer to FIG. 2 , FIG. 3A and FIG. 3B , which are schematic diagrams of the cable manufacturing method of the present invention and product structure diagrams of the first embodiment and the second embodiment, respectively. The manufacturing method is: use an extrusion molding machine to coat a layer of insulating layer (such as polyethylene, PE) 120 on the periphery of the thick bare copper wire 110; Wind the ground wire 140 and the metal shielding device 130 (such as a wide aluminum foil strip) outside the 120. According to the needs, the ground wire 140 can be wound on the inner layer, and the metal shielding device 130 can be wound on the outer layer (its structure is shown in Figure 3A) or The ground wire 140' is wound on the outer layer, and the metal shielding device 130' is wound on the inner layer (its structure is shown in FIG. 3B ). The metal shielding device 130 ( 130 ′) and the ground wire 140 ( 140 ′) can be completed at the same work station, thereby reducing the manufacturing time.

It should be noted that the ground wire 140 ( 140 ′) is wound around the coaxial cable 100 ( 100 ′) in a helical manner with a specific lay length (about 3mm/pitch), so that the coaxial cable 100 ( 100 ′) can be manufactured during manufacture. ') The feed speed is increased, and the winding time is shortened. The cable manufactured according to the present invention will not reduce its anti-electromagnetic field capability, and it can also induce electromagnetic fields opposite to the coaxial line 100 (100') so that the interference cancels each other out.

In addition, the present invention replaces the existing polyethylene insulating layer with the metal shielding device 130 (130') as the shielding layer, and replaces the molding coating with the winding method, so the coaxial alignment can be completed without going through the raw material drying and screening procedures. Meticulous wrapping of threads. In addition, the metal shielding device 130 ( 130 ′) has the advantage of not being easily broken, so the use of the metal shielding device 130 ( 130 ′) of the present invention can avoid the worry of waste disposal, and its manufacturing hours and manufacturing costs are greatly reduced. In terms of the ability to resist electromagnetic waves, as shown in the second embodiment of the present invention, the metal shielding device 130' is arranged between the ground wire 140' and the electromagnetic field of the coaxial line 100', which can reduce the number of coaxial lines 100'. Electromagnetic interference between the coaxial line 100' and the low-frequency signal line.

Please refer to Table 1 again, which is the signal attenuation test report of the present invention, wherein the Frequecny item is the test frequency of sampling; the R.DATA item is the attenuation value of the signal measured under the closed space state; the Fac item is measured under the open space state The attenuation value of the signal; the TOTAL item is the attenuation value of the total signal; (that is, the total value of the R.DATA item plus the Fac. item); the Limit item is the normal signal attenuation value; the Margin item is the error value (that is, the TOTAL item minus the Limit The value obtained by the item). However, the important point is that the Margin value should be less than -2 in the standard of this professional field, and the smaller the value, the better the anti-electromagnetic wave effect of the cable, and the less signal attenuation, that is, the probability of being interfered by noise less. It can be seen from the attached table 1 that the Margin item of the cable of the present invention not only meets the use standard, but is even far lower than -2, which can reduce the degree of interference by noise to a very low degree.

Table 1

Signal attenuation test report standard: EN55022 Category: B Attenuation polarity: Vertical Test length: 10M Attenuation method: Chase CBL6111A: EMCO 3115

Sampling: 63K 80Hz Frequency R.Data+ Fac ＝Total Limit Margin Check Antenna Table<MHz><dBuV><dBuV><dBuV><dBuV> ^* >-2.0 X：over Height Angle 112.49 10.2 13.0 23.2 30.0 -6.9 98 1 157.48 7.6 12.7 20.3 30.0 -9.7 98 382 179.98 10.6 12.2 22.8 30.0 -7.2 98 1 196.06 5.1 13.0 28.1 30.0 -11.9 98 1 memo: QP202.50 11.5 13.2 24.7 30.0 -5.3 98 382 memo: QP225.02 11.1 14.1 25.2 30.0 -4.8 98 322 247.51 13.0 14.8 27.8 37.0 -9.3 98 1 359.99 9.5 20.7 30.2 37.0 -6.8 100 3 450.06 6.4 22.0 28.4 37.0 -8.6 97 246 535.51 6.7 25.2 31.9 37.0 -5.1 97 52

The above disclosures are only embodiments of the present invention, but the present invention cannot be limited thereto, and all changes or improvements made according to the concept of the present invention are included in the claims of the present invention.

Claims (7)

1. cable manufacture method, wherein, the periphery of at least one coaxial line is to utilize coiling machinery to twine metallic shield device and ground wire, makes the metallic shield device be in the internal layer of winding layer and ground wire is in skin, perhaps makes the metallic shield device be in the skin of winding layer and ground wire is in internal layer.

2. cable manufacture method as claimed in claim 1, wherein, described metallic shield device is a kind of aluminium foil strip.

3. cable manufacture method as claimed in claim 1, wherein, described ground wire is to twine described coaxial line by specific lay in a spiral manner.

4. the manufacture method of a cable, wherein, at least one coaxial line is coated by ground wire and metallic shield device simultaneously, and described ground wire is to twine described coaxial line by specific lay in a spiral manner, so that the electromagnetic sound of coaxial line and ground wire offsets each other.

5. cable manufacture method as claimed in claim 4, wherein, described metallic shield device is a kind of aluminium foil.

6. as claim 4 or 5 described cable manufacture methods, wherein, described metallic shield device is coated on the outer surface of described coaxial line and ground wire fully.

7. as claim 4 or 5 described cable manufacture methods, wherein, described ground wire is wound in the outer surface of described coaxial line and metallic shield device.

Images