KR100852681B1 - An electric pole made from fiber reinforced plastics and it's manufacturing method - Google Patents

Abstract

The present invention relates to a fiber reinforced plastic material poles using pneumatic pressure and a method of manufacturing the same, and more particularly, the pole poles on the outer surface of the mendrel wound around the reinforcing fibers by inserting the tube material in the hollow portion of the cylindrical mandrel formed in the longitudinal direction When formed to a certain thickness, the mandrel is separated and separated, and the tube material is inflated to a certain pressure to press the inner surface of the telephone pole with the tube material to efficiently remove bubbles, thereby improving the strength of the telephone pole, and the unit cost is low reinforcing fiber impregnation rate By significantly increasing the strength of the telephone pole, while significantly lowering the manufacturing cost, it is possible to manufacture the telephone pole more economically, as well as to increase the penetration rate. Greatly reduce production costs and improve the working environment. Like the present invention relates to a fiber-reinforced plastic material and a manufacturing method using the utility pole.

Tube material, mold, centrifugal casting machine, reinforced fiber

Description

Telegraph poles and pneumatic fiber reinforced plastic material using pneumatics {An electric pole made from fiber reinforced plastics and it's manufacturing method}

1 is a flow chart of the molding process of the present inventors

Figure 2 is a perspective view of the present invention molding device pole

Figure 3 is an internal longitudinal cross-sectional view of the mold for molding the present invention pole.

4 is an internal cross sectional view of a mold for molding the present invention pole;

Figure 5 is a perspective view of a mold for molding the present inventors pole

Figure 6 is a mendrel departure process diagram of the present inventors pole pole forming process

Figure 7 is a molding process completed to release the mold in the present invention

8 is a perspective view of the telephone pole according to the present invention

9 is a longitudinal sectional view of the telephone pole according to the present invention;

<Detailed Description of Each Code in Drawings>

1: mendrill 2: reinforced fiber

3: mandrel hollow part 4: tube material

5: mold 6: mold

7: polymer resin 8: telegraph pole

9: Air-Compressor

10 pneumatic pressure supply pipe 11: polymer resin feeder

12: pipe for supplying polymer resin 13: hollow body pole

The present invention relates to a fiber reinforced plastic material poles using pneumatic pressure and a method of manufacturing the same, and more particularly, the pole poles on the outer surface of the mendrel wound around the reinforcing fibers by inserting the tube material in the hollow portion of the cylindrical mandrel formed in the longitudinal direction When formed to a certain thickness, the mandrel is separated and separated, and the tube material is inflated to a certain pressure to press the inner surface of the telephone pole with the tube material to efficiently remove bubbles, thereby improving the strength of the telephone pole, and the unit cost is low reinforcing fiber impregnation rate By significantly increasing the strength of the telephone pole, while significantly lowering the manufacturing cost, it is possible to manufacture the telephone pole more economically, as well as to increase the penetration rate. Greatly reduce production costs and improve the working environment. Like the present invention relates to a fiber-reinforced plastic material and a manufacturing method using the utility pole.

In general, telegraph poles are pillars that support wires, telephones, lights, etc., such as neck poles and reinforced concrete poles.

However, the wooden pole is low in price, light in weight, easy to transport, but low in durability due to its low durability, and reinforced concrete is inexpensive and mass-produced, so that most telephone poles are made of concrete, but are transported due to heavy weight. Not only this, but also the reinforcing bar inserted to reinforce strength, the pole itself becomes a conductor, the risk of electric shock is exposed.

Therefore, in recent years, the research on the development of telegraph poles using high-strength ultra-light fiber-reinforced plastics has been increasing in order to greatly improve the weight and non-conductivity of the poles, and to facilitate transportation and prevent the risk of electric shock. Consisting of fiber and polymer resin, glass fiber, carbon fiber and Kevlar fiber are used for the reinforcing fiber, and thermosetting resin such as unsaturated ester, vinyl ester, epoxy and nylon, polyamide-imide, etc. Thermoplastic resin is used, and there are three main methods for producing a telephone pole using a fiber-reinforced plastic material composed of the above constituent materials, such as a drawing method, a filament winding method, and a centrifugal casting method.

The drawing method is a method of drawing a certain shape from the fiber-reinforced plastic mass, and it is difficult to reinforce in the circumferential direction, and in the case of a large structural material, there is a problem that warpage frequently occurs. The filament winding method involves filament-type fiber-reinforced plastics The system poles produced by this method have the highest reinforcing fiber impregnation rate, but are not suitable for forming large-scale pole poles because of their low flexural strength.

Finally, the centrifugal casting method winds the fiber around the mandrel, and then, by using a centrifugal casting machine, the polymer resin is coated on the outer surface of the fiber with the mandrel with centrifugal force and then hardened. When the manufacturing is completed, the manufacturing process will be described in more detail as follows.

A first step of winding reinforcing fibers on the outer surface of the mendrel; A second step of charging a mandrel coated with reinforcing fibers to a mold; A third step of mounting the mold loaded with the mandrel in a centrifugal casting machine; A fourth step of forming the polymer resin into a predetermined thickness while rotating the centrifugal caster while injecting the polymer resin into the mold while integrating the polymer resin with the fibers wound on the outer surface of the mandrel; The fifth step of curing the complete pole after the compression, and separating it; consists of.

When molding the telephone pole by using the conventional centrifugal casting method consisting of the above steps, bubbles are formed in the telephone pole, which is a factor that reduces the strength as the bubbles are formed in the telephone pole after curing the telephone pole. In order to mold to the strength required by the telegraph pole, the centrifugal caster had to be rotated at 1800 revolutions per minute. However, when the centrifugal caster was rotated at such revolutions, noise and vibration were generated very much. Rotating for a considerable time to achieve the strength required by the pole pole, which takes a lot of work time had a disadvantage of very low production efficiency.

In addition, if the centrifugal caster is formed by rotating the centrifugal caster at 1800 revolutions per minute, the reinforcing fibers formed inside the telegraph poles act evenly on the compressive and flexural strengths, but the reinforcing fiber impregnation rate is about 35% by volume. In addition, the strength of the system pole can no longer be increased, but the strength of the fiber impregnated with the 35 vol% is weak as the strength of the system pole.

In addition, in the reinforcing fibers formed at 65 vol% and 35 vol% at the time of forming the telegraph column, the unit cost is also high because the unit cost of the polymer resin having a high constituent ratio as the 65 vol% is high. There was a problem.

The present invention has been made in order to solve the above problems, in the conventional process, between the first step and the second step, add a step of inserting the tube material in the hollow portion of the mandrel, the fourth step Between step 5 and step 5, only the mandrel is removed and the tube material is inflated by inflating the tube material to inflate the inner surface of the telephone pole, thereby removing the bubbles inside the telephone pole, which reduces the strength of the telephone pole. Increasing the strength of the system pole by increasing the strength of the fiber, and increasing the impregnation rate of the reinforcing fiber, and significantly increasing the strength of the body pole by increasing the input of the low-cost reinforcing fiber while lowering the high unit cost of polymer resin. The unit cost is reduced, but the centrifugal caster's rotation speed is reduced from 1800 rpm to 150 rpm. It is an object of the present invention to provide a fiber-reinforced plastic poles using air pressure that can significantly reduce vibration and noise as well as greatly reduce the production process, and a method of manufacturing the same.

Referring to the configuration of the present invention in more detail based on the accompanying drawings as follows.

Figure 1 is a flow chart of the present invention pole molding process, Figure 2 is a perspective view of the present invention molding device of the present invention, Figure 3 is an internal longitudinal cross-sectional view of the mold for molding the present invention pole, Figure 4 is an internal cross-sectional view of a mold for molding the present invention pole. 5 is a perspective view of a mold for molding a telephone pole according to the present invention, FIG. 6 is a mendrel detachment process diagram during a telephone pole molding process according to the present invention, FIG. 7 is a completed process for releasing a mold in the present invention, and FIG. 9 is a longitudinal sectional view of the telephone pole according to the present invention, and the molding process diagram of the present invention will be described in order.

A first step of winding and reinforcing the reinforcing fibers 2 on the outer surface of the mandrel 1; A second step of inserting the tube material (4) into the hollow portion (3) of the mendrel (1) on which the reinforcing fibers (2) are coated; A third step of charging the mandrel 1 coated with the reinforcing fiber 2 to the mold 5; A fourth step of mounting the mold (5) loaded with the mandrel (1) to the centrifugal caster (6); While rotating the centrifugal caster 6 while injecting the polymer resin 7 into the mold 5, the polymer resin 7 is molded to a predetermined thickness while being integrated with the reinforcing fibers 2 wound on the outer surface of the mandrel 1. A fifth step; A sixth step of leaving only the mandrel 1 and injecting air pressure into the tube material 4 to press the inner surface of the telephone pole 8 while expanding the tube material 4; The seventh step of hardening the compression completes the pole pole 8 and separating it.

Each step will be described in more detail as follows.

In the first and second steps, the reinforcing fiber 2 is wound around the outer surface of the mandrel 1 and the tube material 4 is inserted into the hollow part 3 of the mandrel 1. The tube material 4 inserted into the hollow part 3 of the drill 1 has a length equal to the length of the mendrel 1 and the material is formed of a polymer resin film. When the air compressor is connected to the air compressor 9 and the air pressure supply pipe 10 to supply air pressure from the air compressor 9, the tube member 4 is shaped like a balloon by the supplied air pressure. It has a structure that expands, and has a structure that expands at the same rate over the entire length.

In the third and fourth stages, the mandrel 1 wound on the outer surface of the reinforcing fiber 2 is charged into the mold 5, and the mold 5 in which the mandrel 1 is loaded is centrifugal caster 6. In the step of mounting on, in more detail the structure formed in the above step, the tube member 4 inserted in the longitudinal direction inside the cylindrical mendrel (1) is an external air compressor (Air-Compressor) (9) ) And a mandrel (1) wound and provided with a reinforcing fiber (2) wound around the outer surface of the cylindrical mandrel (1), the reinforcing fiber (2) The silver mold 5 has a structure that is tightly inserted into the inside of the mold 5, and the polymer resin supply pipe 12 is inserted in the center of the end of the mold 5 to be connected to the polymer resin feeder 11 to the mold 5. The polymer resin (7) is introduced between the inner surface of the mandrel (1) and the outer surface of the mandrel (1), the tube material interpolated inside the mandrel (1) (4) has a structure in which an air compressor (9) and an air pressure supply pipe (10) are connected. In the figure, reference numeral 13 denotes a hollow portion of the telephone pole.

The fifth step is to rotate the centrifugal caster 6 together with the mold 5 while inserting the polymer resin 7 between the inner surface of the mold 5 and the outer surface of the mendrel 1, wherein the polymer resin 7 has a centrifugal force. As the input amount increases, the thickness of the telephone pole 8 becomes gradually thicker, which penetrates between the reinforcing fibers 2 wound in several layers on the outer surface of the mendrel 1, thereby polymer resin 7 and reinforcing fibers ( 2) is formed in a one-piece, it is to be a structure in which the polymer resin (7) is impregnated inside the telephone pole (8) that is formed into a reinforcing fiber (2).

The conventional centrifugal casting method, which was formed in the fifth step and the hardening step, and proceeded to the curing step, causes problems as described in the detailed description of the present invention.

The sixth step and the seventh step are for solving the problems in the related art. When the thickness of the telephone pole 8 is formed to a predetermined thickness, only the mendrel 1 therein is removed and the tube material remaining therein ( 4) inflate the tube material 4 by injecting air pressure to press the inner surface of the telephone pole 8, and as shown in FIG. In the state where the diameter of the mold 5 surrounding the side is fixed, air pressure is injected from the inner surface of the telegraph pole 8 which has not yet been hardened to press the inner surface of the telegraph pole 8 with the expanded tube material 4. When applied, the telegraph pole 8 is densified by the pressure of the tube material 4, and the bubbles inside the telegraph pole 8 formed while rotating by centrifugal force are released to the outside by the compression of the tube material 4, at this time, The air pressure applied to the tube material is formed to be 0.5 ~ 5kg / ㎠ In this case, the reinforcing fiber impregnation rate is higher, and the strength of the telegraph pole 8 is further improved by removing the bubbles caused by the compression of the tube material 4. Although the reinforcing fiber impregnation rate was hard to exceed 35 vol% or more, it is possible to increase the reinforcing fiber impregnation rate to 65 ± 5 vol% by using the pressure of the tube material (4). The strength of the telegraph pole (8) is increased, the strength is further increased, and in proportion to this, the polymer resin (7) is added at a 35 ± 5 vol. Although the input amount of) is low, the impregnation rate of the low cost reinforcing fiber is increased, so that the strength can be increased and the overall cost can also be reduced.

In addition, in order to achieve the required strength of the telegraph pole 8 only by the centrifugal force of the conventional centrifugal casting method, the required strength of the telegraph pole 8 could be achieved by rotating the mold 5 at a speed of 1800 revolutions per minute. By using the compression by the expansion of the tube material 4 of the present invention, the tissue of the telephone pole 8 can be densified to remove bubbles, and the reinforcing fiber impregnation rate is increased to increase the strength of the telephone pole 8. By doing so, the required strength of the telephone pole 8 can be sufficiently achieved even at 150 rpm, which significantly reduces vibration and noise, and a significantly shorter working time than the conventional 1800 rpm.

The present invention is a centrifugal casting machine by adding a step of inserting the tube material into the mandrel inside the mandrel as described above, separating the mandrel after rotational molding of the centrifugal caster and pressing the inner surface of the whole body by expanding the tube material. By removing the air bubbles that reduce the strength, which is a component of the quality of the main pole, by the pressure of the tube material during rotational molding, the quality is improved compared to the conventional one, and the reinforcing fiber impregnation rate, which is lower in unit price, is increased, thereby significantly increasing the strength of the product. By significantly lowering the unit cost, it is possible to manufacture telegraph poles more economically, thereby increasing the penetration rate, and drastically shortening the rotation speed and working time of the centrifugal casting machine, greatly reducing vibration and noise, improving the working environment and increasing production efficiency. It has a great effect.

Claims (7)

A first step of winding reinforcing fibers on the outer surface of the mendrel; A second step of charging a mandrel coated with reinforcing fibers to a mold; A third step of mounting the mold loaded with the mandrel in a centrifugal casting machine; A fourth step of molding the polymer resin into a predetermined thickness while rotating the centrifugal casting machine while injecting the polymer resin into the mold while integrating the polymer resin with the reinforcing fibers wound on the outer surface of the mandrel; In the method of manufacturing a fiber reinforced plastic material telegraph pole using the air pressure consisting of a fifth step of curing the pressure and complete separation of the pole pole, the tube material is inserted into the hollow of the mandrel between the first step and the second step And a step of releasing only the mandrel between the fourth step and the fifth step, and injecting air pressure into the tube material to inflate the tube material to pressurize the inner surface of the telephone pole. Fiber reinforced plastic material telephone pole manufacturing method using. Fiber-reinforced plastic material poles using pneumatic pressure, characterized in that produced by the method of manufacturing a fiber-reinforced plastic poles poles using air pressure of claim 1. The fiber reinforced plastic material telephone pole according to claim 2, wherein the fiber reinforced plastic material telephone pole is formed of a reinforcing fiber 65 ± 5 volume percent and a polymer resin 35 ± 5 volume percent. The method of claim 1, wherein the air pressure of the tube material for pressing the inner surface of the telephone pole is formed at a pressure of 0.5 ~ 5kg / ㎠. The method of claim 1, wherein the tube material is formed of a polymer resin film. delete delete

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