KR20200068922A - Steel crossarms with insulation coating and manufacturing method thereof - Google Patents

Abstract

According to the present invention, provided is a steel crossarm having an insulation sheath. The steel crossarm comprises: a rectangular parallelepiped-shaped steel frame in which coupling holes for connecting electric poles or insulators are formed, and which is extended in a longitudinal direction; and a PE insulation film which is coated with a thickness of 2.5 to 4.4 mm on a surface of the steel frame. According to the present invention, by implementing the insulation sheath, insulation characteristics of the steel crossarm can be improved, durability of the insulation sheath and the steel crossarm can be improved, and insulation properties different from existing ones to a worker is indicated without causing much discomfort to an installed surrounding environment.

Description

Complete steel with insulating coating and its manufacturing method{STEEL CROSSARMS WITH INSULATION COATING AND MANUFACTURING METHOD THEREOF}

The present invention relates to a wrought iron (also referred to as light wrought iron) for supporting a transmission and distribution line, and more particularly, to a wrought iron coated with an PE insulating film that is not damaged even when a high voltage is applied, and a method for manufacturing the same.

In general, Wancheol is installed on an electric pole, etc., and functions to support an insulator installed on an outer surface. The typical usage patterns of Wancheol are as follows.

As shown in FIGS. 1 and 2, the complete iron provided on the electric wire pole and supporting the transmission/distribution wire is composed of a square pipe shape and is fixed to the upper side of the electric pole 1 and the support frame 10 and the support frame 10. It consists of a support shaft 20 coupled to the vertical direction, a bracket 30 rotatably coupled to the support shaft 20, and a connecting rod 40 connected to the bracket 30.

The suspension insulator 2 to which the transmission/distribution line 3 is connected is fixed to the front end of the connecting rod 40.

The bracket 30 is configured to bend the metal plate to have the upper and lower extension plates 31 extending rearward, a coupling hole 32 into which the connecting rod 40 is inserted in the front center portion is formed, and the extension plate 31 is supported It is rotatably coupled to the support frame 10 by the shaft 20.

The connecting rod 40 has a engaging portion 41 that is hung around the periphery of the engaging hole 32 and is formed to be formed at the rear end and is coupled to penetrate the engaging hole 32 of the bracket 30 from the rear to the front, and is suspended at the tip thereof. The insulator 2 is configured to support the suspended insulator 2 by being combined.

The coupling hole 32 is formed sufficiently wide that the connecting rod 40 is rotated in the vertical and horizontal directions, and when the transmission and distribution line 3 fluctuates due to wind or the like, the connecting rod 40 has a suspension insulator 2 for the transmission and distribution line. It is configured to absorb shock by following and rotating in (3).

Alternatively, as shown in FIG. 3, in order to ensure that the power line 60 is insulated from the electric pole 1, an armature 80 is installed on the electric pole 1, and an insulator 80, which is an insulator 80, is an insulation on the upper portion of the armature 80. ) Is installed, the insulator 90 is formed with a power line insertion groove (not shown) to mount and fix the power line to the power line insertion groove.

However, the existing finished iron is a product made by hot dip galvanizing on iron materials, and it has no insulation characteristics, so frequent breakdowns and safety accidents due to algae-related failures or defective equipment. Therefore, due to this problem of the existing wrought iron, a huge maintenance cost was spent annually due to the cost of removing the bird nest and recovering the power outage.

In the method of manufacturing a PVC coating, which is one of the complementary measures, a lot of work has to be done to form an insulating film. In particular, the manufacturing cost is too high, and there is a disadvantage in that it is not economical.

In the United States, China, and abroad, FRP is manufactured and used, but FRP has a disadvantage in that it is more expensive than conventional light iron and has low mechanical strength.

In other words, a fundamental solution was required for natural disasters, tide-related failures, equipment failures, power outages for worker errors, and contractor safety accidents.

Korean Registered Publication No. 10-1280403

An object of the present invention is to provide a complete iron having an insulating coating capable of effectively preventing worker safety accidents at low cost.

Another object of the present invention is to provide a complete iron with an insulating coating capable of ensuring a much longer life than the conventional case.

Another object of the present invention is to provide a finished iron having an insulating coating that can increase the working efficiency of the operator.

Wancheol having an insulating coating according to an aspect of the present invention, fastening holes are formed for connecting the poles or insulators, a rectangular frame of a rectangular parallelepiped shape extending in the longitudinal direction; And a PE insulating film coated on the surface of the iron frame with a thickness of 2.5 to 4.4 mm,

The PE insulating film may include an insulating coating characterized by 91 to 95% by weight of polyethylene, 1.5 to 3% by weight of an orange pigment, and 3.5 to 6% by weight of a UV blocking agent.

A method of manufacturing an insulator-coated insulator according to another aspect of the present invention comprises the steps of preheating a rectangular parallelepiped iron frame to 110 to 140°C; Mixing 91 to 95% by weight of polyethylene, 1.5 to 3% by weight of orange pigment, and 3.5 to 6% by weight of UV blocker to mix and melt the raw powders to 180 to 260°C; Extruding the molten material onto the preheated iron frame surface; And blowing or spray cooling the iron frame coated with the molten material.

The preheating step, the extruding step, and the cooling step may be performed while the rectangular-shaped iron frame extending in the longitudinal direction is gripped at the outlet of the PE melt extruder and slides.

Here, prior to the step of preheating the iron frame, it may further include a step of drilling fasteners for connecting the pole or insulator to the iron frame.

Here, after the cooling step, may further include a step of drilling fasteners for connecting the pole or insulator to the coated steel frame.

Here, the molten material may be coated with a thickness of 2.5 to 4.4 mm on the surface of the iron frame.

When the insulating coating according to the present invention having the above-described configuration is performed, there is an advantage of improving the insulating properties of the finished iron.

The finished iron having the insulating coating of the present invention has an advantage of increasing the durability of the insulating coating and the finished iron.

Wancheol provided with the insulating coating of the present invention has the advantage of being able to indicate that the worker has a different insulating property from the existing one without giving a great sense of discomfort to the installed surrounding environment.

The finished iron having the insulating coating of the present invention has an advantage that the operator can easily recognize the degree of damage to the insulating coating without significantly increasing the sense of discomfort in the surrounding environment.

The complete iron provided with the insulating coating of the present invention has an advantage in that it is possible to omit the complete iron protection during live working.

The finished iron provided with the insulating coating of the present invention has the advantage of preventing foreign matter contact failure and safety accidents of workers.

1 is a side view showing a complete iron for transmission and distribution line support according to the prior art.
Figure 2 is a plan view showing a complete iron for transmission and distribution line support according to the prior art.
3 is a view showing a connection structure between Jeonju and Wancheol in another prior art.
4A to 4C are longitudinal cutaway cross-sectional views, transverse cutaway cross-sectional views, and enlarged views thereof, showing a structure of a finished steel having an insulating coating according to an embodiment of the present invention.
5 is a flow chart showing a method of manufacturing a finished iron with an insulating coating according to the spirit of the present invention.
6A and 6B are cross-sectional views showing a gripping structure for an iron frame and an outlet of a PE melt extruder performing PE insulation coating while a steel frame of a rectangular parallelepiped shape extending in the longitudinal direction is sliding.
FIG. 7 is a photograph of an insulated wrought iron manufactured according to the manufacturing method shown in FIG. 5.

Hereinafter, specific embodiments for carrying out the present invention will be described with reference to the accompanying drawings.

In describing the present invention, terms such as first and second may be used to describe various components, but components may not be limited by terms. The terms are only for the purpose of distinguishing one component from other components. For example, the first component may be referred to as a second component without departing from the scope of the present invention, and similarly, the second component may be referred to as a first component.

When a component is referred to as being connected to or connected to another component, it may be understood that other components may exist in the middle, although they may be directly connected to or connected to the other components. .

The terms used herein are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions may include plural expressions unless the context clearly indicates otherwise.

In this specification, terms such as include or include are intended to designate the existence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, one or more other features or numbers, It can be understood that the existence or addition possibilities of steps, actions, components, parts or combinations thereof are not excluded in advance.

In addition, the shape and size of elements in the drawings may be exaggerated for clearer explanation.

4A to 4C are longitudinal cutaway cross-sectional views, transverse cutaway cross-sectional views, and enlarged views thereof, showing a structure of a finished steel having an insulating coating according to an embodiment of the present invention.

The illustrated wrought iron 100 is formed with fastening holes 102 for connecting electric poles or insulators, and has a rectangular parallelepiped iron frame 110 extending in the longitudinal direction; And a PE insulating film 140 coated on the surface of the iron frame 110 with a thickness of 2.5 to 4.4 mm.

Here, the PE insulating film 140 may be formed of 91 to 95% by weight of the polyethylene 141, 1.5 to 3% by weight of the orange pigment 142, and 3.5 to 6% by weight of the UV blocking agent 144.

More preferably, around 93% by weight of polyethylene (92.5% by weight to 93.5% by weight), around 2% by weight of orange pigment (1.8% by weight to 2.2% by weight), around 5% of UV blocker (4.7% by weight to 5.3% by weight) It is advantageous to be.

More preferably, the PE insulating film 140 may have a thickness of about 4 mm (3.95 to 4.05 mm).

PE is an eco-friendly material, and has better weatherability, heat resistance, and insulation than PVC or Teflon rubber materials, and is also cheaper.

As shown in the figure, the UV blocking agent 144 is formed in the form of the PE insulating film in which planar particles (ie, similar to mica) are dispersed so as to block and reflect UV by interference of reflected light in the thin film. Distributed in In this case, it is preferable that the thickness of the planar particles has a value capable of blocking and reflecting UV by interference of reflected light.

In other embodiments where mechanical strength of a PE insulating film is more important than efficiency of UV blocking, the UV blocking agent may be formed of long fibrous particles arranged in the longitudinal direction and distributed inside the PE insulating film. In this case, it is preferable that the thickness of the fibrous particle also has a value capable of blocking and reflecting UV by interference of reflected light.

Here, the UV blocking agent is a special organic chemical having an ultraviolet absorbing effect, and may be applied without being denatured even at a molding temperature of about 200 degrees Celsius.

Alternatively, the UV blocking agent may be a particulate powder having an average particle size of tens to hundreds of μm, consisting of at least one of zinc oxide, titanium dioxide, titanium dioxide, and titanium oxide.

The orange pigment may be included in the PE insulating film in a form in which particles of very fine size are evenly distributed inside the PE insulating film or colored in areas where the polyethylene raw material particles are in contact with each other.

It is preferable that the pigment has a color of "orange" 11 or 11 "light orange" in KS A 0011.

For example, the pigment is an aluminum (Al) and/or iron (Fe)-based orange pigment, or a calcium (Ca) and/or magnesium (Mg)-based red pigment, and a cadmium (Cd) and chromium (Cr)-based yellow pigment. It can be used by mixing.

It is advantageous that the size of the pigment particles is 5 to 10 μm.

Figure 5 shows a method of manufacturing a finished iron with an insulating coating according to the spirit of the present invention.

The method of manufacturing the insulator-coated complete iron illustrated includes: perforating fastening holes for connecting an electric pole or an insulator to an iron frame having a rectangular parallelepiped shape (S110); Preheating the steel frame with the fastening holes perforated to 110 to 140° C. (S120); Mixing 91 to 95% by weight of polyethylene, 1.5 to 3% by weight of orange pigment, and 3.5 to 6% by weight of UV blocker to mix and melt the raw powders by heating to 180 to 260°C (S130); Extruding the molten material into the preheated iron frame surface (S140); Blowing or spray cooling the iron frame coated with the molten material (S160); And perforating fastening holes for connecting poles or insulators to the coated iron frame (S190).

The above-described processes inject PE insulation material by extrusion molding process to the outer surface of the iron frame having a shape similar to that of the prior art in the art (having a rectangular parallelepiped shape extending in the longitudinal direction and fastening holes for connecting electric poles or insulators). In this way, a PE insulating film is formed.

To this end, it is preferable to have a batch process structure in which the molten material derived from the outlet of the PE melt extruder is coated on the surface of the iron frame in a viscous state and cooled and hardened.

For example, among the illustrated steps, in the preheating step (S120), the extruding step (S140), and the cooling step (S160), the iron frame of the rectangular parallelepiped shape extending in the longitudinal direction is provided to the outlet of the PE melt extruder. It can be gripped and performed during sliding movement.

In the preheating step (S120), the preheating temperature may be 110 to 140°C, but more preferably, it is near 120°C (115°C to 125°C).

The preheating step (S120) may be performed using an electrothermal heating means for intermittently heating the gripped iron frame and a temperature sensor for measuring the temperature of the region where the iron frame is gripped and enters the outlet. have. For example, when the sensing value of the temperature sensor is less than the preheating temperature, the electrothermal heating means may be driven, and when the preheating temperature is reached, the electrothermal heating means may be stopped.

Depending on the implementation, before the iron frame is gripped on the outlet side, it may be preheated to a temperature near the preheating temperature.

In the melting step (S130), the raw materials are mixed in the same weight percentage ratio so that the PE insulating film may be formed of 91 to 95% by weight of polyethylene, 1.5 to 3% by weight of orange pigment, and 3.5 to 6% by weight of UV blocking agent. Can be.

More preferably, around 93% by weight of the polyethylene reactor (92.5% by weight to 93.5% by weight), around 2% by weight of the orange pigment raw material (1.8% by weight to 2.2% by weight), around 5% of the raw material of the UV blocker (4.7% by weight to 5.3 Weight percent), and heated to 180 to 260°C to melt the raw materials. The melting temperature may be 180 to 260°C, but more preferably 210°C (215°C to 215°C).

Here, the raw material of the UV blocker is a special organic chemical having an ultraviolet absorbing effect, and is stable without deterioration even at a molding temperature of about 200 degrees Celsius, or average of at least one of zinc oxide, titanium dioxide, titanium dioxide and titanium oxide The particle diameter may be a particulate powder having an average particle diameter of tens to hundreds of μm.

The orange pigment raw materials are aluminum (Al) and/or iron (Fe)-based orange pigments, calcium (Ca) and/or magnesium (Mg)-based red pigments, cadmium (Cd) and chromium (Cr)-based yellow pigments It may be a mixture.

It is advantageous that the size of the pigment raw material particles is 5 to 10 μm.

In the extruding step (S140), the molten material is coated with a thickness of 2.5 to 4.4 mm on the surface of the iron frame, more preferably, with a thickness of about 4 mm (3.95 to 4.05 mm). do.

In order to coat with a thickness of 4 mm, it is preferable that the spacing of the annular region between the outlet of the PE melt extruder and the outer surface of the iron frame has a value very slightly smaller than 4 mm. For example, it may have a gap of 3.9 to 3.999 mm.

It is difficult to coat the thickness over 1mm by general impregnation. On the other hand, when the iron frame is coated using a heat-shrinkable tube, the tube does not adhere evenly to the finished steel, resulting in poor insulation, and shrinkage tube hardening occurs after construction (surface cracking). And there is a problem that the tissue is destroyed by shrinking by applying heat to the molded product, it is impossible to sufficiently coat about 4 mm.

In the extruding step (S140), the sliding speed in the state where the iron frame is gripped at the outlet of the extruder is preferably 0.48m/mim to 1.2m/min. Sufficient coating quality can be ensured at the above-mentioned sliding speed, and the coating quality decreases when it is faster, and mass productivity is significantly inhibited when it is late.

In the cooling step (S160), the coated steel frame may be implemented such that the cooling process is performed directly from the portion that comes out of the extruder outlet. At this time, when cooling by blowing, it takes 3 minutes per each (2.4m), and when spraying water as a cooling liquid (that is, cooling by spraying cooling water), it takes 30 seconds.

In an implementation different from that shown, before the step of preheating the iron frame, the fastening holes for connecting the poles or insulators to the iron frame are not drilled, and after the cooling step, the poles or insulators are coated on the coated steel frame. Fastening holes for connection may be simultaneously drilled with respect to the iron frame layer and the coating layer.

6A and 6B show the gripping structure for the iron frame and the outlet of the PE melt extruder performing PE insulation coating while the steel frame of a rectangular parallelepiped shape extending in the longitudinal direction slides.

In the illustrated structure, the iron frame is horizontally moved (sliding movement) at a speed of 0.48 m/mim to 1.2 m/min by a mechanical force while being held at the cylindrical discharge port of the extruder, and for coating simultaneously with this horizontal movement The molten resin material is continuously discharged from the discharge port, and the coated film is formed while the discharged resin (melt material) surrounds the outer surface of the iron frame. Next, the coating film formed on the outer surface of the iron frame is cured by a continuous cooling (blowing or spraying cooling water) process, thereby completing a coating film of sufficient strength and sufficient thickness.

Depending on the implementation, after the step of extruding the molten material (S140), or after the step of cooling (S160), may further include the step of insulatingly closing both ends of the longitudinal direction.

The step of insulatingly closing both ends is performed in a manner of extruding the same molten material continuously before/after the step of extruding the molten material (S140), or after cooling (S160), a separate closing stopper. It can be carried out in a manner of bonding (or attaching) to both ends of the complete iron.

FIG. 7 is a photograph of an insulated finished iron manufactured according to the manufacturing method illustrated in FIG.

It can be seen that the illustrated wrought iron has a PE insulating coating layer that is strongly bonded to the iron frame, and also has a thickness sufficient to support electric wires and the like and a thickness sufficient for insulation.

The color of the product in the picture shown is easy for the operator to distinguish between PE insulated and non-insulated general insulators, and if the PE insulated coating is partially damaged due to considerable aging, the color and contrast of the iron frame are clearly visible, making it easy to recognize. When installed, the sense of discomfort with the surrounding environment is small. This is due to the fact that the exterior color of multi-family/multi-family houses (so-called villas), which are frequently mixed with the iron parts of the telephone pole, are often red brick. This is particularly effective when the color of the wrought iron product according to the pigment has a color of “Orange” 11 times or “Orange” 12 times in KS A 0011.

It should be noted that the above-described embodiments are for the purpose of explanation and not for the limitation. In addition, a person skilled in the art of the present invention will understand that various embodiments are possible within the scope of the technical idea of the present invention.

100: Wancheol
102: fastener
110: iron frame
140: PE insulating film
144: UV blocker

Claims (6)

Fastening holes for connecting the poles or insulators are formed, the rectangular frame of a rectangular parallelepiped shape extending in the longitudinal direction; And
It includes a PE insulating film coated with a thickness of 2.5 to 4.4 mm on the surface of the iron frame,
The PE insulating film,
Finished iron with an insulating coating, characterized in that it is 91 to 95% by weight of polyethylene, 1.5 to 3% by weight of orange pigment, and 3.5 to 6% by weight of UV blocker.
According to claim 1,
The orange pigment,
Wancheol characterized by the color of KS A 0011, the number 11 "orange" or the number 12 "light orange".
Preheating the rectangular-shaped iron frame extending in the longitudinal direction to 110 to 140°C;
Mixing 91 to 95% by weight of polyethylene, 1.5 to 3% by weight of orange pigment, and 3.5 to 6% by weight of UV blocker to mix and melt the raw powders to 180 to 260°C;
Extruding the molten material onto the preheated iron frame surface;
Blowing or spray cooling the iron frame coated with the molten material;
Including,
The preheating step, the extruding step and the cooling step,
A method of manufacturing an insulated coated iron rod, characterized in that the cuboid-shaped iron frame extending in the longitudinal direction is gripped at the outlet of the PE melt extruder and is performed during sliding movement.
According to claim 3,
Before the step of preheating the iron frame,
Perforating fasteners for connecting the poles or insulators to the iron frame
A method of manufacturing an insulator-covered insulator that further comprises
According to claim 3,
After the cooling step, perforating fastening holes for connecting the pole or insulator to the coated steel frame
A method of manufacturing an insulator-covered insulator that further comprises
According to claim 3,
The molten material, the method of manufacturing an insulating coated complete iron, characterized in that the surface of the iron frame is coated with a thickness of 2.5 to 4.4 mm.

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