KR102716721B1 - Pipe Drawing Molding Apparatus for FRP - Google Patents

Abstract

The present invention relates to an FRP pipe drawing molding device which enables the inner peripheral surface of a glass fiber reinforcement to be obtained without becoming uneven and a smooth inner surface without a separate external mold in the process of continuously drawing a glass fiber reinforcement. Since a second glass fiber is wound while applying strong pressure to the surface of the glass fiber reinforcement, even when the glass fiber reinforcement is continuously drawn without a separate external mold, the inner peripheral surface of the glass fiber reinforcement can always obtain a smooth inner surface.

Description

FRP Pipe Drawing Molding Apparatus for FRP

The present invention relates to an FRP pipe drawing molding device, and more specifically, to an FRP pipe drawing molding device that enables a smooth inner surface of a glass fiber reinforcement material to be obtained without an inner peripheral surface becoming uneven and without a separate external mold during a process of continuously drawing glass fiber reinforcement material.

Recently, due to the diversification of industries, composite material molded products developed for high strength and high elasticity are not only light in weight, but also have excellent chemical resistance, corrosion resistance, and high tensile strength, and are being utilized in various industrial fields. These composite material molded products are generally manufactured using filament winding equipment.

FIG. 1 is a drawing illustrating a conventional FRP pipe drawing molding device. Referring to FIG. 1, the conventional FRP pipe drawing molding device is configured to include a fiber supply member (110) through which reinforcing fibers (105) such as glass fibers and carbon fibers are wound, through a plurality of bobbins (112), a resin impregnation sink (130) containing a thermosetting resin such as unsaturated polyester or epoxy resin so that the reinforcing fibers (105) supplied from the fiber supply member (110) are impregnated, and a mandrel (140) on which reinforcing fibers (105) impregnated in the resin are wound. And the reinforcing fiber (105) supplied from the fiber supply member (110) is impregnated into the resin impregnation tank (130), and the reinforcing fiber (105) impregnated into the resin impregnation tank (130) is regularly wound around a rotating mandrel (140) to reach a predetermined thickness, thereby manufacturing a molded product.

In this conventional technology, the molded product undergoes pultrusion molding while passing through the pultrusion mold. In order to obtain a smooth inner surface, this pultrusion molding must be performed by passing the molded product between the inner mold and the outer mold of the pultrusion mold. The inner and outer surfaces of the molded product become smooth due to the sealing phenomenon caused by the pressure generated at this time.

However, since the process of passing the molded product between the inner mold and the outer mold requires separate preparation of both the inner mold and the outer mold, there is a problem of increased mold costs.

Republic of Korea Patent Publication No. 10-1802122

The purpose of the present invention to solve the problems of the prior art as described above is to provide an FRP pipe drawing forming device which enables the inner peripheral surface of a glass fiber reinforcement to be obtained without becoming uneven and a smooth inner surface during the process of continuously drawing the glass fiber reinforcement.

In addition, another object of the present invention is to provide an FRP pipe drawing molding device that enables the inner peripheral surface of a glass fiber reinforcement to be smooth without becoming uneven and obtainable by using only a mandrel, i.e., an inner mold, without a separate, complex outer mold, thereby enabling work to be performed quickly with a simple structure and reducing mold costs, thereby lowering the unit price of the product.

In order to achieve the above object, the present invention comprises: a mandrel formed in an elongated shape along a longitudinal direction; a plurality of first glass fibers formed to extend from one longitudinal side of the mandrel to the other longitudinal side so as to cover an outer periphery of the mandrel and coated with a first thermosetting resin; a fixed bearing having a through hole formed so as to allow the mandrel and the first glass fibers to pass through; a rotary bearing formed in a ring shape so as to be rotatable along the outer periphery of the fixed bearing; a rotating means for rotating the rotary bearing; a winding part rotatably mounted on one side of the rotary bearing and having a second glass fiber wound around it; And a tension control unit mounted on the other side of the rotary bearing and providing tension to second glass fibers wound on the winding unit, wherein a plurality of first glass fibers provided on the mandrel are formed of glass fiber reinforcement, and the second glass fibers wound on the winding unit are supplied to the tension control unit while being unwound, are provided with tension, and are then configured to be wound on the glass fiber reinforcement.

In addition, the present invention provides an FRP pipe drawing molding device characterized in that the second glass fiber is wound around the glass fiber reinforcement while the second thermosetting resin is applied thereto, and the second glass fiber wound around the glass fiber reinforcement is formed into an external reinforcement by hardening the second thermosetting resin.

In addition, the tension control unit includes a housing mounted on the other side of the rotary bearing and having a space formed inside, and a plurality of rotary rollers arranged in parallel inside the housing, wherein a pair of rotary rollers adjacent to each other are positioned to contact each other, and the second glass fiber unwound from the winding unit is configured to be sequentially guided to the outer periphery of each rotary roller so as to pass between the pair of rotary rollers adjacent to each other and then wound around the glass fiber reinforcement, and the second glass fiber unwound from the winding unit is guided to the rotary roller to be tensioned, and then wound while applying pressure to the glass fiber reinforcement, thereby providing an FRP pipe drawing molding device.

In addition, the present invention provides an FRP pipe drawing molding device characterized in that it further includes a rotary gear mounted on one side of each of the rotary rollers, and a pair of the rotary gears adjacent to each other are configured to mesh with each other.

In addition, the tension control unit further includes a brake box mounted on one side of the housing, powder formed of a metal material and filled inside the brake box, a rotational shaft having one side penetrating one of the plurality of rotational rollers and the other side penetrating the inside of the brake box, an extension part formed to extend in the inner lateral direction of the brake box on the other side of the rotational shaft, an electromagnet arranged on the outer lateral side of the brake box, and a power supply part that supplies power to the electromagnet, wherein the magnetic force of the electromagnet changes according to the amount of current applied to the electromagnet by the power supply part, the amount of powder moving toward the inner lateral side of the brake box is controlled by the change in the magnetic force of the electromagnet, and the frictional force applied by the powder moving toward the inner lateral side of the brake box is controlled to become stronger or weaker according to the amount of powder moving toward the inner lateral side of the brake box.

In addition, the rotating means includes: an outer gear formed along the outer periphery of the rotating bearing, a rotating motor positioned to be spaced apart from one side of the rotating bearing, and a connecting belt connecting the outer gear and the rotating motor, and when the rotating power of the rotating motor is transmitted to the connecting belt, the connecting belt rotates the outer gear, thereby rotating the rotating bearing. The present invention provides an FRP pipe drawing molding device.

In addition, the present invention provides an FRP pipe drawing molding device characterized in that it further includes a guide plate positioned on one side of the fixed bearing so that the mandrel penetrates therethrough and having a plurality of guide holes formed along the circumferential direction, and the first glass fiber is guided to cover the outer periphery of the mandrel while penetrating through the guide holes.

In addition, the present invention provides an FRP pipe drawing molding device characterized in that the inside of the mandrel is provided with a heating section so as to be heated.

In addition, the present invention provides an FRP pipe drawing molding device characterized in that it further includes a support frame, one side of which is connected to the fixed bearing and the other side of which is supported on the ground or a base, and the first glass fiber, the fixed bearing, the support frame, the rotating bearing, the rotating means, the winding part, the second glass fiber, and the tension adjusting part are divided into one forming group member, and a plurality of the forming group members are provided along the longitudinal direction of the mandrel.

In addition, an FRP pipe drawing forming device is provided, characterized in that a drawing member is provided at an end of the mandrel to draw the glass fiber reinforcement when a second glass fiber is wound around the glass fiber reinforcement.

In the present invention, since the tension control section applies tension to the second glass fiber, the second glass fiber is wound while applying strong pressure to the surface of the glass fiber reinforcement, and the glass fiber reinforcement is strongly adhered to the outer periphery of the mandrel by the force applied by the second glass fiber, so that even when the glass fiber reinforcement is continuously drawn, the inner periphery of the glass fiber reinforcement that is strongly adhered to the outer periphery of the mandrel always has a smooth inner surface.

In addition, since the inner periphery of the glass fiber reinforcement can be smoothly formed only with the mandrel, i.e. the inner mold, without an external mold, a separate, complex outer mold is not required, enabling the work to be carried out quickly and with a simple structure, does not take up much space, and since the mold length can be extended, the straightness of the product can be improved, and the mold cost can be saved, so the unit price of the product can be lowered, and there is the effect of increased productivity.

In addition, since the tension control unit can control the frictional force that the powder applies to the extension unit by utilizing the change in magnetic force of the electromagnet, there is an effect that can control the pressure that the second glass fiber applies to the glass fiber reinforcement depending on the situation or design.

In addition, since a plurality of first glass fibers are supplied to the mandrel through each of the guide holes formed in the guide plate, the plurality of first glass fibers are evenly arranged on the outer periphery of the mandrel without being biased in any one direction and without any empty space.

Figure 1 is a drawing illustrating a conventional FRP pipe drawing forming device.
FIG. 2 is a drawing schematically illustrating an FRP pipe drawing forming device according to a preferred embodiment of the present invention.
FIG. 3 is a drawing illustrating a forming group member of an FRP pipe drawing forming device according to a preferred embodiment of the present invention.
FIG. 4 is a drawing schematically illustrating a vertical cross-section of a forming group member of an FRP pipe drawing forming device according to a preferred embodiment of the present invention.
Figure 5 is an enlarged drawing of the tension control unit illustrated in Figure 4.
Figure 6 is a schematic drawing of the tension control unit illustrated in Figure 5 in vertical cross section.

Hereinafter, an FRP pipe drawing forming device according to a preferred embodiment of the present invention will be described in more detail with reference to the attached drawings.

FIG. 2 is a drawing schematically illustrating an FRP pipe drawing forming device according to a preferred embodiment of the present invention.

Referring to FIG. 2, an FRP pipe drawing forming device according to a preferred embodiment of the present invention includes a mandrel (100), a support member (110), a forming group member (200), and a drawing member (300).

A mandrel (100) is formed in a long cylindrical shape with a certain diameter and serves as a mold for forming a molded product, i.e. a pipe. The pipe may also be formed as a core.

And in some cases, the inside of the mandrel (100) may be provided with a heating part (120) to be heated.

The support member (110) supports the mandrel (100) so that it is spaced upward from the ground, and includes a base (112), a support projection (114), and a support pillar (116). The base (112) is formed to be long along the longitudinal direction and is positioned to be supported on the ground. The support projection (114) is formed to protrude upward from one side of the base (112). The support pillar (116) is formed to protrude horizontally from the upper side of the support projection (114) to the base (112). In addition, a mandrel (100) is coupled to an end of the support pillar (116), so that the mandrel (100) is formed horizontally toward the other side of the base (112).

The forming group member (200) supplies the first glass fiber (210) and the second glass fiber (250) to the mandrel (100), and may be composed of one or more. When the forming group member (200) is composed of multiple pieces, the multiple forming group members (200) are arranged to be spaced apart at a certain interval along the longitudinal direction of the mandrel (100).

The drawing member (300) is for drawing the glass fiber reinforcement (212) generated by the forming group member (200), which will be described later, and is placed at the end of the mandrel (100) located in the opposite direction to the support member (110). This drawing member (300) includes a plurality of drawing rollers (302) installed at the outer peripheral end of the glass fiber reinforcement (212) when the end of the glass fiber reinforcement (212) is located at the end of the mandrel (100), a drawing motor (306) positioned to be spaced apart from one side of the drawing rollers (302), and a drawing belt (304) connecting the drawing rollers (302) and the drawing motor (306). And when the extraction motor (306) rotates the extraction belt (304), the extraction roller (302) rotates, and at this time, the glass fiber reinforcement (212) is extracted in a direction away from the support protrusion (114) due to the frictional force between the extraction roller (302) and the outer periphery of the glass fiber reinforcement (212).

FIG. 3 is a drawing illustrating a forming group member of an FRP pipe drawing forming device according to a preferred embodiment of the present invention, and FIG. 4 is a drawing schematically illustrating a forming group member of an FRP pipe drawing forming device according to a preferred embodiment of the present invention in a vertical cross-section.

Referring to FIGS. 2 to 4, the molding group member (200) includes a first glass fiber (210), a fixed bearing (220), a support frame, a rotating bearing (222), a guide plate (224), a rotating means (230), a winding part (240), a second glass fiber (250), and a tension adjusting part (260).

The first glass fiber (210) is composed of a plurality of rovings, glass fibers, etc., for example, so as to evenly cover the entire outer periphery of the mandrel (100) without any empty space. Each of the first glass fibers (210) is formed to extend from one side of the mandrel (100) in the longitudinal direction to the other side, and is arranged along the longitudinal direction of the mandrel (100). In addition, a plurality of fiber supply units (not shown) may be provided so that a plurality of first glass fibers (210) are supplied toward the mandrel (100), and the first glass fibers (210) wound on each of the fiber supply units are unwound and supplied to the mandrel (100).

And the first glass fiber (210) is coated with the first thermosetting resin. To this end, a resin impregnation section (not shown) containing the molten first thermosetting resin is provided between the fiber supply section and the mandrel (100), and while the first glass fiber (210) is impregnated in the resin impregnation section, the first thermosetting resin is sufficiently applied to its surface. The first thermosetting resin may be composed of, for example, an epoxy resin or a polyester resin. And when the first thermosetting resin applied to the plurality of first glass fibers (210) provided on the mandrel (100) is cured, it is formed into a glass fiber reinforcement (212).

The fixed bearing (220) is formed with a through hole (220a) through which the mandrel (100) and the first glass fiber (210) pass, and is formed, for example, in the shape of a ring with a through hole (220a) formed inside. In addition, the fixed bearing (220) is connected to a support frame (not shown). One side of the support frame is connected to the side of the fixed bearing (220), and the other side of the support frame is supported on the ground or a base (112), so that the mandrel (100) can be maintained in a state where it is inserted into the through hole (220a) of the fixed bearing (220).

The rotary bearing (222) is formed in a ring shape so as to be rotatable along the outer periphery of the fixed bearing (220). That is, the rotary bearing (222) is supported by the fixed bearing (220) and rotates along the outer periphery of the fixed bearing (220). This rotary bearing (222) may also be formed in the form of a swing bearing.

The guide plate (224) is formed in a disc shape and is positioned and fixed on one side of the fixed bearing (220). In addition, a hole (224a) is formed in the center of the guide plate (224) so that the mandrel (100) can pass through it. A plurality of guide holes (224b) are formed along the circumferential direction on the side of the guide plate (224). In addition, the first glass fiber (210) is arranged to cover the outer periphery of the mandrel (100) while penetrating through the guide holes (224b). In this way, since the plurality of first glass fibers (210) pass through each of the guide holes (224b) and are supplied to the mandrel (100), the plurality of first glass fibers (210) are evenly arranged without any empty space on the outer periphery of the mandrel (100) without being biased in any one direction.

The rotating means (230) rotates the rotating bearing (222), and includes, for example, an outer gear (232) formed along the outer periphery of the rotating bearing (222), a rotating motor (234) positioned to be spaced apart from one side of the rotating bearing (222), and a connecting belt (236) connecting the outer gear (232) and the rotating motor (234). When the rotating power of the rotating motor (234) is transmitted to the connecting belt (236), the connecting belt (236) rotates the outer gear (232), thereby causing the rotating bearing (222) to rotate.

The winding unit (240) is like a skein around which the second glass fiber (250) is wound, and is rotatably mounted on one side of the rotary bearing (222) and the second glass fiber (250) is wound around it. This winding unit (240) includes a winding roller (242) rotatably mounted on one side of the rotary bearing (222) and a winding body (244) formed along the outer periphery of the winding roller (242). The second glass fiber (250) is wound around the winding body (244). In some cases, a plurality of winding units (240) may be provided along the circumferential direction of one side of the rotary bearing (222).

The second glass fiber (250) may be composed of roving yarn, glass fiber, etc., similar to the first glass fiber (210). The second glass fiber (250) is configured to be wound around the glass fiber reinforcement (212) in a state in which it is unwound from the winding unit (240). That is, the first glass fiber (210) is evenly arranged along the longitudinal direction of the mandrel (100), and the second glass fiber (250) is evenly arranged along the circumferential direction of the mandrel (100). At this time, the drawing member (300) continuously draws the glass fiber reinforcement (212), so that the second glass fiber (250) is evenly arranged in the circumferential direction around the glass fiber reinforcement (212).

And the second glass fiber (250), like the first glass fiber (210), is wrapped around the glass fiber reinforcement (212) while being impregnated and coated with the second thermosetting resin, and the second glass fiber (250) wrapped around the glass fiber reinforcement (212) is formed into an external reinforcement (252) by curing the second thermosetting resin. The second thermosetting resin may be composed of the same or different material as the first thermosetting resin.

The tension control unit (260) is mounted on the other side of the rotary bearing (222) and provides tension to the second glass fiber (250) wound on the winding unit (240). The second glass fiber (250) is wound while applying pressure to the glass fiber reinforcement (212) formed on the mandrel (100) after tension is provided by the tension control unit (260). Then, the second glass fiber (250) applies strong pressure to the surface of the glass fiber reinforcement (212), and in this state, after a certain period of time, when the first glass fiber (210) and the second glass fiber (250) are hardened, even if the glass fiber reinforcement (212) is continuously drawn, the inner periphery of the glass fiber reinforcement (212) can always obtain a smooth inner surface. In addition, since the inner periphery of the glass fiber reinforcement (212) can be formed smoothly only with a mandrel, i.e. an inner mold, without an external mold, a separate complex outer mold is not required, allowing work to proceed quickly with a simple structure, does not take up much space, and saves mold costs, which has the effect of lowering the unit price of the product.

Fig. 5 is an enlarged drawing of the tension control unit illustrated in Fig. 4, and Fig. 6 is a schematic drawing of the tension control unit illustrated in Fig. 5 in a vertical cross-section.

Referring to FIGS. 2 to 6, the tension control unit (260) includes a housing (261) mounted on the other side of the rotary bearing (222) and having a space formed therein, a plurality of rotary rollers (262) arranged in parallel inside the housing (261), and a rotary gear (263) mounted on one side of each rotary roller (262). In addition, a pair of rotary gears (263) adjacent to each other may be configured to mesh with each other. In addition, a pair of rotary rollers (262) adjacent to each other are positioned to contact each other, and the second glass fiber (250) unwound from the winding unit (240) is sequentially guided to the outer periphery of each rotary roller (262), but is configured to be alternately guided to one or the other side of the outer periphery of each rotary roller (262) and then wound around the glass fiber reinforcement (212). At this time, it is preferable that the outer periphery of the rotating roller (262) be formed of a rubber material to prevent the second glass fiber (250) from slipping.

In addition, the tension control unit (260) may further include a brake box (264) mounted on one side of the housing (261), a powder (265) formed of a metal material and disposed inside the brake box (264), a rotational shaft (266) having one side penetrating one of the plurality of rotational rollers (262) and the other side penetrating the inside of the brake box (264), an extension part (267) formed to extend in a circular shape in the inner lateral direction of the brake box (264) on the other side of the rotational shaft (266), an electromagnet (268) disposed on the outer lateral side of the brake box (264), and a power supply part (not shown) that supplies power to the electromagnet (268).

The powder (265) may be composed of a spherical powder containing iron (Fe). The electromagnet (268) is a conventional configuration that receives power and forms magnetism. The power supply unit may be composed of a rotary ring, slip ring, etc. that can supply power to the electromagnet (268) from the outside, or may be composed of a charging unit that is charged with power internally, and the user can control the amount of current. Since these are conventional, a detailed description will be omitted.

And, depending on the change in the amount of current applied to the electromagnet (268) by the power supply unit, the magnetic force of the electromagnet (268) changes, and the amount of powder (265) moving toward the inner side of the brake box (264) is controlled by the change in the magnetic force of the electromagnet (268), and depending on the amount of powder (265) moving toward the inner side of the brake box (264), the frictional force applied by the powder (265) located toward the inner side of the brake box (264) to the extension (267) can be controlled to become stronger or weaker.

And when the powder (265) moves to the inner side of the brake box (264) due to the strength of the magnetic force generated by the electromagnet (268), the powder (265) forms a frictional force on the extension (267), so that the rotation of the extension (267) is impeded, and the rotation speed of the rotational shaft (266) and the rotational roller (262) connected to the extension (267) is limited. On the other hand, since the speed at which the rotational means (230) rotates the rotational bearing (222) does not change, the second glass fiber (250) wound in the winding unit (240) is applied with tension as it passes through the rotational roller (262) of the tension adjusting unit (260), and then is wound while applying pressure to the glass fiber reinforcement (212) formed in the mandrel (100).

In this way, since the second glass fiber (250) is wound while applying strong pressure to the surface of the glass fiber reinforcement (212), even if the glass fiber reinforcement (212) is continuously drawn, the inner periphery of the glass fiber reinforcement (212) always has a smooth inner surface.

In addition, since the frictional force applied by the powder (265) to the extension (267) can be controlled by utilizing the change in magnetic force of the electromagnet (268), there is an effect of being able to control the pressure applied by the second glass fiber (250) to the glass fiber reinforcement (212) depending on the situation or design.

Although the present invention has been described in detail in the above embodiments, it is obvious that the present invention is not limited thereto, and it is obvious to those skilled in the art that various modifications and variations are possible within the technical scope of the present invention, and if such modifications and variations fall within the scope of the appended claims, the technical scope thereof should also be considered to belong to the present invention.

100: Mandrel 10: Support
112: Base 114: Supporting Dolbu
116: Supporting column 120: Heating section
200: Molding group member 210: 1st glass fiber
212: Glass fiber reinforcement 220: Fixed bearing
220a: Through hole 222: Rotating bearing
224: Guide plate 224a: Through hole
224b: Guide hole 230: Rotating means
232: Outer gear 234: Rotating motor
236: Connecting belt 240: Coiling part
242: Winding roller 244: Winding body
250: 2nd glass fiber 252: External reinforcement
260: Tension adjustment part 261: Housing
262: Rotating roller 263: Rotating gear
264: Break Box 265: Powder
266: Rotation axis 267: Extension
268: Electromagnet 300: Pull-out member
302: Pull-out roller 304: Pull-out belt
306: Pull motor

Claims (10)

A mandrel formed into an elongated shape along the length direction;
A plurality of first glass fibers formed to extend from one longitudinal side of the mandrel to the other longitudinal side to cover the outer periphery of the mandrel and to which a first thermosetting resin is applied;
A fixed bearing having a through hole formed so that the mandrel and the first glass fiber can penetrate through it;
A rotary bearing formed in a ring shape so as to be rotatable along the outer periphery of the above fixed bearing;
A rotating means for rotating the above-mentioned rotary bearing;
A winding part rotatably mounted on one side of the above rotary bearing and having a second glass fiber wound thereon; and
It includes a tension control unit that is mounted on the other side of the above rotary bearing and provides tension to the second glass fiber wound on the above winding unit.
The plurality of first glass fibers provided in the above mandrel are formed of glass fiber reinforcement,
The second glass fiber wound on the above winding section is supplied to the tension control section while being unwound, and tension is applied thereto, and then it is configured to be wound on the glass fiber reinforcement material.
The above tension control unit,
A housing mounted on the other side of the above rotary bearing and having a space formed inside,
It comprises a plurality of rotating rollers arranged in parallel inside the housing,
A pair of adjacent rotating rollers are positioned so as to contact each other,
The second glass fibers wound from the above winding section are configured to be guided sequentially to the outer periphery of each of the above rotating rollers so as to pass between a pair of adjacent rotating rollers and then be wound around the glass fiber reinforcement.
The outer periphery of the above-mentioned rotating roller is formed of a rubber material to prevent the second glass fiber from slipping.
An FRP pipe drawing molding device characterized in that the second glass fiber drawn from the above-mentioned winding section is guided to the above-mentioned rotating roller to be tensioned and then wound while applying pressure to the above-mentioned glass fiber reinforcement.
In paragraph 1,
The above second glass fiber is wrapped around the glass fiber reinforcement while the second thermosetting resin is applied thereto,
An FRP pipe drawing molding device, characterized in that the second glass fiber wrapped around the glass fiber reinforcement is formed into an external reinforcement by hardening a second thermosetting resin.
delete In paragraph 1,
An FRP pipe drawing forming device further comprising a rotary gear mounted on one side of each of the rotary rollers, wherein a pair of the rotary gears adjacent to each other are configured to mesh with each other.
In paragraph 1,
The above tension control unit,
A brake box mounted on one side of the above housing,
Powder formed of metal material and filled inside the above brake box,
A rotary shaft having one side penetrating one of the plurality of rotary rollers and the other side penetrating the interior of the brake box,
An extension formed on the other side of the above rotation axis extending in the inner lateral direction of the above brake box,
An electromagnet placed on the outer side of the above brake box,
Further comprising a power supply unit that supplies power to the above electromagnet,
An FRP pipe drawing molding device characterized in that the magnetic force of the electromagnet changes according to the amount of current applied to the electromagnet by the power supply unit, the amount of powder moving toward the inner side of the brake box is controlled by the change in the magnetic force of the electromagnet, and the frictional force applied to the extension by the powder moving toward the inner side of the brake box is controlled to become stronger or weaker according to the amount of powder moving toward the inner side of the brake box.
In paragraph 1,
The above rotating means:
An outer gear formed along the outer periphery of the above rotary bearing,
A rotary motor positioned so as to be spaced apart from one side of the above rotary bearing,
Including a connecting belt connecting the above outer gear and the above rotary motor,
An FRP pipe drawing molding device characterized in that when the rotational power of the above-mentioned rotary motor is transmitted to the above-mentioned connecting belt, the above-mentioned connecting belt rotates the above-mentioned outer gear, thereby rotating the above-mentioned rotary bearing.
In paragraph 1,
It further includes a guide plate positioned on one side of the fixed bearing so that the mandrel penetrates, and having a plurality of guide holes formed along the circumferential direction.
An FRP pipe drawing forming device characterized in that the first glass fiber is guided to cover the outer periphery of the mandrel while penetrating through the guide hole.
In paragraph 1,
An FRP pipe drawing forming device characterized in that the inside of the mandrel is provided with a heating section so as to be heated.
In paragraph 1,
One end of the support frame is connected to the fixed bearing and the other end of the support frame is supported on the ground or base,
The above first glass fiber, the fixed bearing, the support frame, the rotary bearing, the rotary means, the winding part, the second glass fiber and the tension control part are separated into one molding group member,
An FRP pipe drawing forming device, characterized in that a plurality of the above-mentioned forming group members are provided along the longitudinal direction of the mandrel.
In paragraph 1,
An FRP pipe drawing forming device characterized in that a drawing member is provided at an end of the mandrel to draw out the glass fiber reinforcement when a second glass fiber is wound around the glass fiber reinforcement.

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