PARK, Hyun-ho (#103-104, Hyunjin APT. Inpyeong-ri, Buksam-eu, Chilgok-gun Gyeongsangbuk-do 718-844, KR)
SHIM, Sung-ik (#23-606, Hanshin 2nd APT. Banpo-don, Seocho-gu Seoul 137-040, KR)
PARK, Hyun-ho (#103-104, Hyunjin APT. Inpyeong-ri, Buksam-eu, Chilgok-gun Gyeongsangbuk-do 718-844, KR)
[CLAIMS] [Claim 1] a device for coating a wire rod of a composite overhead ground wire with optical fiber (OPGW) and an overhead line, the device comprising: a hermetic housing; a supply unit supplying gas with predetermined pressure through a carrying pipe connected to the housing; a metal powder supply unit supplying metal powders into the carrying pipe to allow the metal powders to be mixed with gas carried through the carrying pipe; and two or more spray guns connected to the carrying pipe and installed in the housing so as to coat the surface of the wire rod moving at predetermined velocity with the metal powders through spraying metal powders-mixed gas onto the surface. [Claim 2]
The device as claimed in claim 1, wherein the spray gun sprays the metal powders with the pressure from 15 to 30MPa. [Claim 3]
The device as claimed in claim 1 or 2, wherein the metal powders are aluminum powders. [Claim 4]
The device as claimed in claim 3, further comprising a heater provided near the carrying pipe between the supply unit and the metal powder supply unit so as to heat the gas carried along the inside of the carrying pipe at a temperature from 100 to 500°C . [Claim 5]
A method of coating a wire rod of a composite overhead ground wire with optical fiber (OPGW) and an overhead line, the method comprising the steps of:
(a) cleaning the surface of the wire rod to be coated; and
(b) mixing metal powders with gas with predetermined pressure, spraying the metal powder-mixed gas onto the surface of the wire rod moving at predetermined velocity, thereby coating the surface of the wire rod with the metal powders. [Claim 6]
The method as claimed in claim 5, wherein the metal powders are sprayed in the pressure from 15 to 30MPa. [Claim 7]
The method as claimed in claim 6, wherein the metal powders are aluminum powders. [Claim 8]
The method as claimed in claim 7, wherein the step (b) further comprising a step of heating the gas at a temperature from 100 to 500 0 C . [Claim 9]
The method as claimed in claim 5, further comprising the step of stranding the coated wire rods. |
[DESCRIPTION]
[Invention Title]
DEVICE AND METHOD FOR COATING WIRE ROD OF OPTIC OVERHEAD EARTH WIRE
[Technical Field]
The present invention relates to a device and method of coating a rod wire of a composite overhead ground wire with optical fiber (OPGW) and an overhead line, and more particularly to a device and method of coating powders mixed with high pressure gas onto a rod wire of an OPGW and an overhead line.
[Background Art]
Generally, diverse composite overhead ground wires with optical fibers (OPGW) and overhead lines are surface-treated in order to increase their insulation property. Among the surface treatment methods, there is an aluminum surface treatment method for manufacturing stainless steel loose tube (SSLT) type OPGW and the overhead line. As a method of coating a rod wire or a wire with aluminum, there are an aluminum spray coating method, an aluminum taping method, and an aluminum cladding method.
FIG. 1 is a flow chart illustrating the aluminum spray coating method of manufacturing a conventional wire rod of an OPGW and an overhead line. FIG. 2 is a flow chart illustrating the aluminum taping method of manufacturing a conventional wire rod of an OPGW and an overhead line. FIG. 3 is a flow chart illustrating the aluminum cladding method of manufacturing a conventional wire rod of an OPGW and an overhead line.
In the aluminum taping method illustrated in FIG. 2, an aluminum tape laminated on the wire rod may be torn or peeled off upon stranding or laying. Then, after a long-term period, the deterioration of an adhesive causes the adhesion strength to be degraded, so that the tape is peeled off, or foreign matters are intruded into the peeled laminated portion, thereby degrading anti-corrosion effect, or quality of OPGW.
In the aluminum cladding method, the aluminum heated above 500°C is coated onto a substrate, e.g., a rod wire, that has been preheated, through a
high pressure extrusion. At this time, however, jellies, fibers, and binder yarns in the SSLT type OPGW deteriorate due to high temperature so that they
are deformed, or upon cladding, the OPGW are deformed or torn due to high pressure.
Meanwhile, the aluminum spray coating method illustrated in FIG. 1 also has the same problems above because it is processed with high temperature in the process of a blasting step, a preheating step, and a coating step.
In coating aluminum using the conventional aluminum cladding method, it is impossible to coat aluminum in thickness of 0.35mm or less, so that the weight of the overall OPGW increases and manufacturing cost and additional cost are needed a lot. In addition, at the thick coating, earth fault or short-circuit due to weight may occur.
Meanwhile, in manufacturing a strand consisting of wire rods coated with aluminum, as illustrated in FIG. 3, aluminum should be coated onto the respective wire rods, and a winding process should be carried out. Then, a process of preparing a strand should be carried out, so that the manufacturing process is complicated. In addition, when the aluminum coating is peeled off from the conventional OPGW, causing defects, the maintenance thereof is impossible.
[Disclosure]
[Technical Problem]
Accordingly, the present invention has been made to solve the above- mentioned problems occurring in the prior art, and an object of the present invention is to provide a device and method of coating a wire rod of a composite overhead wire with optical fiber and an overhead line with powders mixed with pressure gas through spraying so as to have a good coating quality and to allow an instant stranding, thereby improving productivity.
[Technical Solution]
In order to accomplish the above object, there is provided a device for coating a wire rod of a composite overhead ground wire with optical fiber
(OPGW) and an overhead line, the device comprising: a hermetic housing; a supply unit supplying gas with a predetermined pressure through a carrying pipe connected to the housing; a metal powder supply unit supplying metal powders into the carrying pipe to allow the metal powders to be mixed with gas carried through the carrying pipe; and one or more spray guns connected to the carrying pipe and installed in the housing so as to coat the surface of the wire rod moving at predetermined velocity with the metal powders through spraying metal powders-mixed gas onto the surface.
Herein, the spray gun may spray the metal powders with the pressure from 15 to 30MPa.
In addition, the metal powders may be aluminum powders, and a heater is provided near the carrying pipe between the supply unit and the metal powder supply unit so as to heat the gas carried along the inside of the carrying pipe at a temperature from 100 to 500°C .
In accordance with another aspect of the present invention, there is provided a method of coating a wire rod of a composite overhead ground wire with optical fiber (OPGW) and an overhead line, the method comprising the steps of: cleaning the surface of the wire rod to be coated; and mixing metal powders with gas with predetermined pressure, spraying the metal powder-mixed gas onto the surface of the wire rod, thereby coating the surface of the wire rod with the metal powders.
The coating method may further comprise the step of stranding the coated wire rods. [Description of Drawings]
The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a flow chart illustrating an aluminum spray coating method of manufacturing a conventional wire rod of a composite overhead ground wire with optical fiber (OPGW) and an overhead line;
FIG. 2 is a flow chart illustrating an aluminum taping method of
manufacturing a conventional wire rod of an OPGW and an overhead line;
FIG. 3 is a flow chart illustrating an aluminum cladding method of manufacturing a conventional wire rod of an OPGW and an overhead line;
FIG. 4 is a schematic view illustrating the state in which a spray gun of a coater according to the present invention sprays metal powders-mixed gas onto a moving wire rod;
FIG. 5 is a schematic view illustrating the construction of a device for coating the OPGW and the overhead line according to an embodiment of the present invention;
FIG. 6 is a flow chart illustrating a method of coating the OPGW and the overhead line according to an embodiment of the present invention;
FIG. 7 is a schematic view illustrating the state in which the wire rods are stranded while being coated according to an embodiment of the present invention; and
FIG. 8 is a sectional view illustrating the state in which the coated wire rods have been stranded by the process illustrated in FIG. 7. [Mode for Invention]
Hereinafter, the preferred embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 4 is a schematic view illustrating the construction of a device for coating a wire rod of a composite overhead ground wire with optical fiber (OPGW) and an overhead line according to a preferred embodiment of the present invention.
Referring to FIG. 4, the coating device 100 of the present invention includes a hermetic housing 60, a gas supply unit 110 supplying gas with predetermined pressure through a carrying pipe 50 connected to the housing 60, a metal powder supply unit 130 supplying metal powders into the carrying pipe 50, a heater 120 heating the gas carried through the carrying pipe 50, and a spray gun installed in the housing 60 so as to coat the surface of a wire rod 1 moving at predetermined velocity with the metal powders through spraying metal powders-mixed gas 20 carried through the carrying pipe 50 onto
the surface.
In the hermetic housing 60, the coating of the wire rod 1 is carried out.
The housing 60 is connected with the carrying pipe 50, which in turn is connected with the gas supply unit 110. The gas supply unit 110 supplies gas in predetermined pressure, preferably, 15~30Mpa, through the carrying pipe 50.
The metal powder supply unit 130 is connected to a certain portion of the carrying pipe 50 so as to supply the metal powders into the carrying pipe 50, rendering the metal powders mixed with the gas supplied from the gas supply unit 110. The metal powders may be aluminum powders, but the present invention does not limited thereto, so it is possible to use different metal powders.
The heater 120 is installed on the carrying pipe between the gas supply unit 110 and the metal powder supply unit 130 so as to heat the gas carried through the carrying pipe 50. The heater 120 heats the gas in the carrying pipe 50 to a predetermined temperature, preferably 100-500°C , that is less than a melting point of the aluminum powders supplied from the metal powder supply unit 130.
The carrying pipe 50 connected to the housing 60 divides into branch carrying pipes 51 in the housing 60, and the branch pipes are connected to the spray guns 10 installed in the housing 60. The spray guns 10 are installed perpendicular to or inclined to the movement direction of the wire rod 1 in the housing 60. In FIG. 4, the wire rod 1 moves perpendicular to a plane so that the three spray guns 10 are arranged at regular angle intervals of 120° perpendicular to the movement direction of the wire rod 1. By such arrangement, the surface of the wire rod 1 is completely coated by the metal powder-mixed gas 20 sprayed from the spray guns 10. The number of the spray guns 10 is not limited, but may be two or more in consideration of the coating process. The spray guns 10 are preferably disposed as closer to the wire rod 1 moving at predetermined velocity as possible in consideration of
the efficiency of the coating process. After the coating process in the housing 60, the metal powders that are not coated onto the surface of the wire rod 1, but dropped to the bottom of the housing can be collected and reused.
The metal powder-mixed gas carried through the carrying pipe 50 and the branch pipe 51 is sprayed by the spray guns 10. FIG. 5 is a schematic view of the construction of the spray guns 10 for spraying and coating the metal powder-mixed gas onto the surface of the wire rod 1 moving in an arrow direction. In FIG. 5, only two of spray guns 10 are illustrated for convenience of explanation. The spray guns 10 are arranged perpendicular to the movement direction of the wire rod 1, and the metal powder-mixed gas sprayed through the spray guns 10, as described before, preferably has the pressure from 15 to 300Mpa and the temperature from 100 to 500°C. The metal powders in the powder-mixed gas are adhered to and coated onto the surface of the wire rod 1. Preferably, the size and shape of nozzles constituting the spray guns 10 are formed similar to each other in consideration of the size of the wire rod 1, thereby maximize the adhesion rate of the metal powders. Like this, the average size of the aluminum powders coated onto the surface of the wire rod 1 is at least 0.3mm, and the thickness of an aluminum coating 2 on the wire rod 1 can be regulated, for example, from 20 to a few hundreds μm, using a particle size, spraying velocity, and movement velocity of the wire rod 1.
FIG. 6 is a flow chart illustrating a method of coating the OPGW and the overhead line according to an embodiment of the present invention.
In the method of coating the OPGW and the overhead line according to the present invention, a cleaning process is performed to remove the foreign matters possibly existing on the surface of the source wire rod 1 in order to coat the wire rod powders (hereinafter referred to as "aluminum powders" of the OPGW and the overhead line).
After the cleaning process, the wire rod 1 from which the foreign matters are removed, as illustrated in FIG. 4, is carried in the housing 60
of the coating device 100 at predetermined velocity. In this case, the spray guns 10 arranged perpendicular to or inclined to the movement direction of the wire rod 1 in the housing 60 spray high temperature and pressure aluminum powder-mixed gas 20 so that the aluminum powders are coated onto the surface of the wire rod 1.
The aluminum powder-mixed gas 20 sprayed through the spray guns 10 are sprayed in the pressure from 15 to 30Mpa onto the wire rod 1 so as to adhere the aluminum powders to the wire rod 1.
FIG. 7 is a view illustrating the coating process of the unit wire rods 1 while standing thereof proceeds according to an embodiment of the present invention. FIG. 8 is a sectional view of the coated OPGW and the overhead line stranded through the stranding process.
The wire rods 1 coated by the coating method of the OPGW and the overhead line can be directly introduced into the stranding process.
As illustrated in FIG. 7, the spray guns 10 connected to the branch carrying pipes 51 are set near the plurality of wire rods 1 to coat the aluminum powders onto the plurality of wire rods 1 according to the coating device and method of the present invention.
Then, as illustrated in FIG. 8, the coating process of the wire rods 1 are performed, and the stranding process of the wire rods 1 are carried out by the coating device and method of the OPGW and the overhead line according to the present invention. [Industrial Applicability]
As set forth before, according to the device and method of coating the OPGW and the overhead line, the aluminum powders are coated in a good coating quality, thereby preventing a change in physical properties of the wire rods.
In addition, after the coating process of the wire rods, the stranding process can be subsequently performed, thereby reducing the manufacturing cost and the number of processes.
Although preferred embodiments of the present invention have been described for illustrative purposes, those skilled in the art will appreciate
that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.
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