KR102742324B1 - Automatic continuous device for grating and manufacturing method of fiber reinforced plastic grating using thereof - Google Patents

Abstract

The automatic continuous production device for grating according to the present invention continuously moves a guide block, which is a mold, while repeating stopping and moving when manufacturing fiber-reinforced plastic grating, and continuously supplies fibers to grooves formed in the guide block in accordance with the stopping or moving of the guide block, thereby improving productivity and efficiently carrying out automation compared to existing grating devices. In addition, since the supply and drawing of fibers and the injection and curing of resin are carried out simultaneously in one device, more uniform gratings can be efficiently produced.

Description

Automatic continuous device for grating and manufacturing method of fiber reinforced plastic grating using its

The present invention relates to an automatic continuous production device for grating and a method for manufacturing fiber-reinforced plastic grating using the same. More specifically, the present invention relates to an automatic continuous production device for grating which can improve productivity and efficiently automate compared to existing grating devices by continuously moving or supplying fibers and a guide block, which is a mold, during the manufacture of fiber-reinforced plastic, and a method for manufacturing fiber-reinforced plastic grating using the same.

In general, grating is formed by welding steel plates to maintain rigidity in a grid shape inside a square frame, and is used for various facilities such as roadsides, upper parts of drains and manholes, drainage maintenance parts inside buildings, and shelves. It basically consists of a number of bearing bars installed side by side in one direction to enable drainage, and screw bars penetrating the bearing bars in a grid shape that intersect.

It is installed to allow wastewater to drain through the grid perforation portion between the bearing bar and the screw bar, and to filter out foreign substances larger than a certain size, and to prevent the wheels of pedestrians, small wheeled objects (such as trunk bags, inline skates, handcarts, baby strollers, etc.) and automobiles from falling into or getting caught in the drain when they pass.

These gratings are used in a variety of ways depending on their intended use, from small gratings for rainwater inflow to larger gratings installed in subway ventilation shafts, and they are used in various sizes.

However, conventional gratings are made entirely of metal, making them difficult to transport and store. Metal materials are expensive, so there is a risk of theft. In addition, the grid shape is exposed to the outside, making it difficult to blend in with the surrounding environment.

Accordingly, in recent patent publication number 2012-0034526 (published on April 12, 2012), a conventional liquid wax release agent is applied to the inner surface of the bottom surface and side surfaces of the inserted cavity of a grating manufacturing mold, glass fibers are repeatedly laminated using an unsaturated synthetic resin binder, and when the target thickness is reached, the manufacturing mold is mechanically vibrated to deaerate, the manufacturing mold is dried in a dryer to harden and molded, and this is separated, finished with sandpaper, and an anti-slip agent is applied to manufacture the same.

However, the above FRP grating manufacturing method has the problem that, even aside from injecting the binder into the manufacturing mold, a person must manually laminate the glass fibers into the binder in a lattice shape. This not only causes a major problem in productivity, but also has the disadvantage of being difficult to automate efficiently because it is not a method of manufacturing grating by continuously operating the manufacturing mold on a single line.

Republic of Korea Publication Patent No. 10-2012-0034526 (April 12, 2012)

The present invention has been made to solve the above problems, and specifically, the purpose is to provide an automatic continuous production device for grating, which improves productivity and enables efficient automation compared to existing grating devices by continuously moving a guide block, which is a mold, while repeating stopping and moving when manufacturing fiber-reinforced plastic, and continuously supplying fibers to grooves formed in the guide block in accordance with the stopping or moving of the guide block, and a method for manufacturing fiber-reinforced plastic grating using the same.

The present invention relates to an automatic continuous production device for grating and a method for manufacturing fiber-reinforced plastic grating using the same.

One aspect of the present invention relates to an automatic continuous production device for grating, which manufactures grating by using guide blocks having a plurality of cross grooves and bearing grooves formed orthogonally to each other on an upper surface, the device comprising: a pair of frames extending in the machine direction and spaced apart from each other by a predetermined distance so as to allow the guide blocks to pass in the machine direction; a first fiber guide inserted into the cross grooves of the guide blocks and sliding along the cross grooves to supply a first fiber to the cross grooves; a second fiber guide inserted into the bearing grooves of the guide blocks and supplying a second fiber to the bearing grooves; and a resin injection unit formed at an end in the machine direction of the frame and injecting a polymer resin into the guide blocks into which the first fibers and the second fibers are inserted; wherein the guide block stops when it receives the first fiber by the first fiber guide, and when the first fiber is supplied, moves in the machine direction so that the first fiber guide can be inserted into a next cross groove.

In the present invention, the automatic continuous production device for grating may further include a crossbar for sliding the first fiber guide in the direction of forming the cross valley; and a heating unit formed at the lower end of the frame and provided so as to face the lower surface of the guide block to heat-treat the guide block.

In addition, the second fiber guide may have a tapered portion formed at the end inserted into the bearing groove, the width of which is gradually changed in the machine direction.

In addition, the resin injection part may include an upper mold formed to extend in the machine direction on the upper surface of the frame and provided to cover the upper surface of the guide block; a lower mold formed to extend in the machine direction between the frames and provided to cover the lower surface of the guide block; and one or more resin injection holes formed to penetrate the upper surface of the upper mold.

Another aspect of the present invention relates to a method for manufacturing a fiber-reinforced plastic grating, characterized by comprising the steps of: a) introducing a guide block having a plurality of cross grooves and bearing grooves formed perpendicularly to each other on an upper surface into the automatic continuous production device for grating according to the above, and inserting first fibers and second fibers into the cross grooves and bearing grooves, respectively; b) passing the guide block of step a) through a resin injection unit to fill the cross grooves and bearing grooves with resin; and c) removing the resin from the guide block and then polishing the surface.

In the present invention, the first fiber, the second fiber, or both of them include one or a plurality of fibers selected from glass fibers, carbon fibers, basalt fibers, metal fibers, and aromatic polyamide fibers, and the resin includes one or a plurality of fibers selected from epoxy resins, phenol resins, unsaturated imide resins, unsaturated polyester resins, cyanate resins, isocyanate resins, benzoxazine resins, oxetane resins, allyl resins, dicyclopentadiene resins, silicone resins, triazine resins, melamine resins, urea resins, and furan resins.

The automatic continuous production device for grating according to the present invention continuously moves a guide block, which is a mold, while repeating stopping and moving when manufacturing fiber-reinforced plastic grating, and continuously supplies fibers to grooves formed in the guide block in accordance with the stopping or moving of the guide block, thereby improving productivity and efficiently carrying out automation compared to existing grating devices. In addition, since the supply and drawing of fibers and the injection and curing of resin are carried out simultaneously in one device, more uniform gratings can be efficiently produced.

FIG. 1 is a perspective view of an automatic continuous production device for grating according to one embodiment of the present invention.
FIG. 2 is a cross-sectional view illustrating the formation of a grating by transferring multiple guide blocks and inserting first and second fibers in an automatic continuous production device for grating according to one embodiment of the present invention.
Figure 3 is a front view of an automatic continuous production device for grating according to one embodiment of the present invention.
Figure 4 is a perspective view of a guide block according to one embodiment of the present invention.
Figure 5 is a plan view of a guide block according to one embodiment of the present invention.
Figures 6 to 8 are perspective views illustrating the guide block transport and the insertion process of the first and second fibers of the automatic continuous production device for grating according to one embodiment of the present invention.
Figures 9 to 11 are plan views illustrating the guide block transport and the insertion process of the first and second fibers of the automatic continuous production device for grating according to one embodiment of the present invention.
FIG. 12 is a cross-sectional view showing a process of injecting resin into a guide block with laminated fibers in a resin injection unit according to one embodiment of the present invention.

The automatic continuous production device for grating according to the present invention and the method for manufacturing fiber-reinforced plastic grating using the same will be described in detail with reference to the following specific examples. The following specific examples are provided as examples so that those skilled in the art can sufficiently convey the idea of the present invention.

Therefore, the present invention is not limited to the specific examples presented below and may be embodied in other forms. The specific examples presented below are only described to clarify the idea of the present invention, and the present invention is not limited thereto.

In this case, if there is no other definition for the technical and scientific terms used, they have the meaning commonly understood by a person of ordinary skill in the technical field to which this invention belongs, and in the following description, explanations of well-known functions and configurations that may unnecessarily obscure the gist of the present invention are omitted.

In addition, the drawings introduced below are provided as examples so that the spirit of the present invention can be sufficiently conveyed to those skilled in the art. Therefore, the present invention is not limited to the drawings presented below and may be embodied in other forms, and the drawings presented below may be exaggerated to clarify the spirit of the present invention. In addition, the same reference numerals represent the same components throughout the specification.

Additionally, the singular forms used in the specification and the appended claims are intended to include the plural forms as well, unless the context clearly dictates otherwise.

Also, in describing components of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only intended to distinguish the components from other components, and the nature, order, or sequence of the components are not limited by the terms. When it is described that a component is "connected," "coupled," or "connected" to another component, it should be understood that the component may be directly connected or connected to the other component, but another component may also be "connected," "coupled," or "connected" between each component.

In the present invention, ‘machine direction’ means the direction in which the guide block moves in the automatic continuous production device for grating, as indicated by the arrow in Fig. 2.

In general, grating is a plate material that maintains rigidity by forming crossbars and bearing bars in a lattice shape inside a square frame using steel plates or fiber-reinforced plastics. Because it has a lattice shape, sewage and other fluids can be discharged through the perforated parts, and because it has excellent mechanical properties, it is widely used in various fields.

However, when iron is used as a raw material, the material is heavy and has problems with rust prevention due to its nature, and in the case of fiber-reinforced plastic, in order to maintain its properties, multiple layers must be formed on each crossbar and bearing bar and laminated alternately. However, since this lamination work requires people to directly laminate the fibers, mass production and automation are difficult, and the manufactured grating has the disadvantage of not having uniform quality.

The inventor of the present invention, while conducting extensive research to solve such problems, discovered that a guide block in which a plurality of cross grooves and bearing grooves are formed orthogonally is supplied in the machine direction of the device, and at the same time, fiber guides are separated into a first fiber guide and a second fiber guide and inserted into the cross grooves and bearing grooves to supply fibers, and in particular, the first fiber guide slides along the cross grooves while inserting the fibers into the cross grooves, thereby enabling effective fiber insertion into the guide block, thereby completing the present invention.

The automatic continuous production device for grating according to the present invention is characterized by manufacturing grating by continuously introducing a plurality of guide blocks into the production device. Specifically, the device is an automatic continuous production device for grating that manufactures grating by using a guide block (100) having a plurality of cross grooves (110) and bearing grooves (120) formed orthogonally to each other on the upper surface as shown in FIGS. 4 and 5, and may include a pair of frames (200) that extend in the machine direction as shown in FIGS. 1 and 2 and are spaced apart from each other by a certain distance so as to allow the guide blocks to pass in the machine direction; a first fiber guide (300) that is inserted into the cross groove of the guide block and slides along the cross groove to supply a first fiber to the cross groove; a second fiber guide (400) that is inserted into the bearing groove of the guide block and supplies a second fiber to the bearing groove; and a resin injection unit (500) that is formed at the machine direction end of the frame and injects a polymer resin into the guide block into which the first fiber and the second fiber are inserted.

Hereinafter, the specific operational relationship of the grating manufacturing device according to the present invention will be described through the drawings. As shown in FIGS. 1 and 2, first fibers and second fibers are supplied and inserted into the cross grooves and bearing grooves formed in the guide blocks, respectively. These first fibers and second fibers intersect to form one fiber layer. Since these fiber layers are formed in multiple layers, a plurality of fibers can be positioned as reinforcing yarns in each formation direction of the cross and bearing of the grating. At this time, a single fiber layer formed by the first fibers and the second fibers can be formed by supplying the first fibers and the second fibers from one first fiber guide and a plurality of second fiber guides, respectively.

At this time, the first fiber guide can insert the first fiber by sliding across the cross-valve of the guide block. Specifically, when the first fiber guide crosses one cross-valve to insert the fiber, the corresponding guide block moves a certain distance in the machine direction so that the fiber is not inserted, and then the cross-valve advances to a position where the second fiber guide can cross. At the end of the advance, the corresponding guide block stops, and the first fiber guide slides across the stopped guide block. Then, the guide block repeats moving a certain distance to insert the fiber into the guide block.

In addition, the manufacturing device is characterized in that fibers are continuously supplied to a plurality of guide blocks by supplying a plurality of guide blocks adjacent to each other as shown in Fig. 2 so that the guide block positioned in front in the machine direction is pushed by the guide block positioned behind.

In the present invention, the guide block (100) has a rectangular parallelepiped shape with a number of protrusions formed on the upper portion as shown in FIGS. 1 to 5, and the grooves formed between the protrusions are cross grooves (110) and bearing grooves (120), respectively, into which first and second fibers are inserted, and when passing through a resin injection portion described later, resin is injected into the grooves, thereby forming a grating, which is a type of mold.

The above cross groove (110) and the bearing groove (120) are formed on the upper surface of the guide block and are formed so as to be perpendicular to each other when viewed from the upper surface as shown in FIGS. 4 and 5. Accordingly, when the guide block passes through the resin injection section described later, resin is injected and hardened into the cross groove and the bearing groove, thereby forming a grating having fibers inside the cross bar and the bearing bar.

The above guide block is a type of mold that forms a grating as described above, and allows multiple guide blocks to pass adjacently in the machine direction when passing through the device. Through this, layers formed by first and second fibers are continuously laminated on the guide block, and the guide block including the laminated fibers passes through the resin injection part described below, so that one guide block forms one grating.

The above guide block is not limited in shape and size. The guide block is sufficient as long as it can easily move between the frames described later, and is preferably a rectangular solid. In addition, the shape, number, and size of the cross groove and bearing groove are not limited, and can be freely adjusted according to the shape of the grating being manufactured, the purpose of use, etc.

In addition, the guide block is not limited to a material. However, it is preferable that the guide block be manufactured from a material that has thermal stability to the extent that the shape does not change or deform even when a polymer resin described later is applied in a molten state, and has mechanical properties that do not change the shape even when friction is applied when inserting a fiber. For example, the guide block may be manufactured from iron or stainless steel, or from an engineering plastic such as polyacetal, ultra-high molecular weight polyethylene, modified polyphenylene, polybenzoxazole, or polybenzimidazole.

In addition, the guide block may have a release agent applied to the surface so that the hardened grating can be easily demolded. The release agent is not limited in type as long as it is commonly used in the art, and examples thereof include silicone-based release agents, fluorine-based release agents, long-chain alkyl group-containing release agents, alkyd resin-based release agents, aminoalkyd resin-based release agents, copolymerization or mixing of organic polymers and silicones, shellac resins, polyolefin-based release agents, etc. These may be used alone or in combination of two or more. Preferably, a silicone-based release agent is used in consideration of demoldability.

In the present invention, the frame (200) forms a kind of passage through which the guide block passes, and at the same time, serves as a support that allows the first fiber guide and the second fiber guide, which will be described later, to be positioned on the upper surface of the guide block. As shown in FIGS. 1 to 3, it may be arranged to extend in the machine direction and be spaced apart by a certain distance so as to allow the guide block to pass in the machine direction.

Specifically, the frame has two bar shapes extending in the machine direction as shown in Fig. 1, and the two bars are provided to be spaced apart by a certain distance in the cross-groove direction of the guide block. Through this, the guide block (100) passing through the two bars has its upper surface exposed so that the first fiber guide and the second fiber guide, which will be described later, can pass through while being inserted into one cross-groove and all bearing grooves, respectively.

To this end, the frame may further be provided with an auxiliary frame (210) that protrudes a certain length in the direction of the upper surface of the guide block to position the first fiber guide and the second fiber guide so that they face the upper surface of the guide block.

The above auxiliary frame is formed to protrude in the upper direction of the guide block so as to be perpendicular to the machine direction in which the frame is extended, as shown in FIGS. 1, 6 to 8, and may be formed to face either one or both of the pair of frames. In addition, the above auxiliary frames may be provided in multiple numbers on one frame spaced apart from each other by a predetermined distance. In this case, even when the auxiliary frames are provided on both frames, the auxiliary frames may be provided in multiple numbers on each frame spaced apart from each other by a predetermined distance.

At this time, the distance between the auxiliary frames can be determined according to the machine direction length of the guide block. That is, as described above, when a plurality of guide blocks pass continuously in the machine direction through one device, the first fiber guide must pass through the cross grooves of the guide block one by one while inserting the first fiber so that the first fiber and the second fiber are laminated to form one layer. Therefore, it is preferable that the distance between the auxiliary frames be the same as or slightly larger than the machine direction length of the guide block.

In addition, it is preferable that the number of the auxiliary frames provided is the same as the number of cross-grooves formed in the guide block. In this case, the number of cross-grooves refers to the number of cross-grooves formed in one guide block, not the sum of the number of cross-grooves of all guide blocks inserted into the machine.

This is because, as described above, when the first fiber and the second fiber are laminated to form one layer on the guide block, each of the fiber layers is formed by the first fiber (inserted into the cross groove of the guide block) supplied from one first fiber guide and the second fibers (inserted into the bearing groove of the guide block) supplied from all the second fiber guides. Therefore, if the number of auxiliary frames is less or more than the number of cross grooves of the guide block, the first fiber may not be inserted into some cross grooves or may be inserted in an overlapping manner.

However, in FIG. 1, the number of auxiliary frames is shown to be less than the number of cross-goals of the guide block, but this is because some parts have been omitted to simplify the expression. In an actual device, the number of auxiliary frames must be the same as the number of cross-goals of the guide block.

In addition, the frame may be provided with a transport device between the frames for transporting a plurality of guide blocks continuously. For example, the transport device may be a rotary conveyor belt, and the conveyor belt may operate to rotate and stop repeatedly by the distance between the cross-ridges of the guide blocks.

In addition, the device may further include a heating unit (600) formed at the bottom as in Fig. 1 and provided so as to face the lower surface of the guide block to heat-treat the guide block.

The above heating unit (600) is intended to apply heat to the guide block to promote thermal curing of the resin, and as shown in Fig. 1, a plurality of heating units may be arranged at the bottom of the frame, each spaced apart from the other by a certain distance in the longitudinal direction.

The heating unit above does not limit the heating form. For example, the heating unit may spray hot air through a nozzle, and may pass current through the resistor so that the heat of the resistor is transferred to the guide block. In addition, a cooling unit that cools the guide block heated to a high temperature separately from the heating unit to promote demolding may be further arranged at the end of the resin injection unit described later.

In the present invention, the first fiber guide (300) is provided to insert the first fiber (1) into the cross groove (110) of the above-described guide block (100), and as shown in FIGS. 6 to 8, it is positioned on the upper surface of the guide block and can insert the fiber into the cross groove while performing a sliding movement in the direction of forming the cross groove.

Specifically, as shown in Fig. 6, the first fiber guide is inserted into the cross groove of the guide block and can slide in the direction of the arrow. In addition, separately, the first fiber guide passes the first fiber (1) supplied from a bobbin or the like through the main body of the guide and supplies it to the cross groove of the guide block. Therefore, when the first fiber guide performs the sliding motion, the first fiber passing through the guide is naturally inserted into the cross groove.

FIG. 7 illustrates a state in which the first fiber guide of FIG. 6 moves from its original position to the opposite side through a sliding motion. In this case, the guide block moves a certain distance in the machine direction so that the first fiber guide can pass through the next cross-floor. In addition, the first fiber guide slides in the opposite direction to FIG. 6 so that the first fiber is inserted into the next cross-floor. In addition, when the sliding motion of the first fiber guide in FIG. 7 is completed, the guide block moves forward in the machine direction again to a degree that the first fiber guide can pass through the next cross-floor, and as the first fiber guide and the guide block repeat the motion and movement, the first fiber and the second fiber form a single layer.

FIGS. 9 to 11 illustrate the first fiber insertion process of FIGS. 6 to 8 from the front. First, referring to FIG. 9 with respect to the direction of travel of the guide block as shown in FIG. 9, the first fiber has not yet been inserted into cross valleys ① to ③, and the first fiber has been inserted into cross valley ⑤ and part of cross valley ④. The first fiber guide inserts the first fiber by sliding along cross valley ④, and during this time, movement of the guide block in the machine direction is stopped.

And when the first fiber is completely inserted into the cross groove ④, the guide block moves in the machine direction so that the first fiber guide can be inserted into the cross groove ③, as shown in Fig. 10, and then stops again. In that state, the first fiber guide passes through the cross groove ③ through a sliding motion and inserts the first fiber.

Again, when the first fiber is completely inserted into the cross groove ③, the guide block moves in the machine direction as shown in 11 so that the first fiber guide can be inserted into the cross groove ②, and then stops again. In that state, the first fiber guide operates by sliding to pass through the cross groove ② and insert the first fiber.

Accordingly, the first fiber guide continuously changes its direction of movement in a cycle of repeating the movement and stop of the guide block. For example, in FIG. 6, when the first fiber guide moves from left to right and supplies the first fiber to the cross-bone, in FIG. 7, when the first fiber guide passes through the next cross-bone and inserts the first fiber, the first fiber guide moves from right to left.

At this time, the guide block may temporarily stop moving in the machine direction depending on whether the first fiber, which will be described later, is supplied. Specifically, the guide block stops when the first fiber is supplied by the first fiber guide, and when the first fiber is supplied, the first fiber guide may move in the machine direction so that it can be inserted into the next cross-goal.

That is, the guide block can pass through the production device while repeatedly stopping and moving, and by injecting a polymer resin into the guide block into which the first fiber and the second fiber are inserted, it can have the form of a grating.

Accordingly, the first fiber guide can repeatedly perform the movement of stop-slide from right to left-stop-slide from left to right-stop... in accordance with the movement-stop-movement-stop-movement... of the guide block.

Of course, even during the sliding movement of the first fiber guide as described above, the second fiber guide continuously supplies the second fiber to the bearing bone. That is, by the movement of the guide block, the first fiber and the second fiber are supplied to the cross bone and the bearing bone, respectively, so that the two fibers form one layer by crossing each other.

At this time, the first fiber (1) is supplied so as to be positioned above the second fiber (2). That is, since the first fiber guide is positioned downstream of the second fiber guide based on the direction of movement of the guide block, the second fiber is supplied to the guide block before the first fiber, and then the first fiber is supplied and intersects with the second fiber so as to be positioned above it.

The above first fiber guide may be installed on one side of the auxiliary frame described above, more specifically, on one side exposed in the direction of forming the crossbones of the guide block and on a crossbar (310) protruding vertically. At this time, the crossbar may have a structure like a rail so that the crossbar can be installed to be able to slide, and this structure may have a typical form provided in the art for sliding movement.

In addition, the first fiber guide may further include a first through hole (320) for passing the first fiber in a direction perpendicular to the direction of movement of the first fiber guide so that the first fiber can be inserted correctly without being twisted or the filaments of the first fiber becoming disordered during the insertion process of the first fiber, as shown in FIG. 8.

The above first through hole is not limited in shape or size. For example, the first through hole may have a circular cross-sectional shape corresponding to the cross-sectional shape of the first fiber formed by filament braiding, and preferably has a cross-sectional area larger than that of the braided first fiber. The first through hole formed in this manner can prevent the filaments forming the first fiber from being excessively twisted or only a portion of the filaments from being inserted into the cross-trough.

In the present invention, the second fiber guide (400) is provided to insert the second fiber (2) into the bearing groove (120) of the above-described guide block (100), and as shown in FIGS. 1 and 2, a plurality of fiber guides may be sequentially arranged at a predetermined distance apart in the direction of formation of the cross groove so that a predetermined area is inserted into the upper surface of the guide block, more specifically, the bearing groove.

That is, the second fiber guides are preferably provided in the same number as the bearing grooves of the guide block, but are arranged at a distance proportional to the spacing between each bearing groove so that one second fiber guide can be inserted into each bearing groove.

To this end, the second fiber guide is preferably provided on a side of the crossbar as shown in Figs. 1 and 2, and is preferably provided on a side opposite to the side on which the first fiber guide is provided. Through this, the second fiber can be first inserted into the bearing groove and then the first fiber can be inserted into the cross groove, so that the first fiber can be laminated in a shape in which the second fiber presses the second fiber.

In addition, it is preferable that the second fiber guide is provided with a plurality of second fiber guide lines spaced apart in the machine direction and sequentially arranged at a certain distance apart in the direction of formation of the cross-bones to form a multi-layer fiber layer in the guide block as shown in FIGS. 1 and 2.

That is, in the grating manufacturing device according to the present invention, one first fiber guide and a plurality of second fiber guides are provided in one auxiliary frame and one crossbar, and these fiber guides supply first fibers and second fibers to the guide block to form one fiber layer. Accordingly, when one first fiber guide and a plurality of second fiber guides are formed as a pair in order to form a plurality of fiber layers in the guide block, a plurality of such pairs of guides must be provided.

In this way, after the first fiber guide supplies the first fiber to some or all of the cross-valves formed in one guide block, the guide block receives the first fiber and the second fiber from the next first fiber guide and second fiber guide through movement in the machine direction, thereby forming a layer of fibers.

The above second fiber guide, like the first fiber guide, may further include a second through hole (420) for passing the second fiber toward the upper surface of the guide block so that the second fiber can be inserted correctly during the insertion process without the second fiber being twisted or the filaments being disorganized.

The above second through-hole is formed one by one for each second fiber guide, and similarly to the first through-hole, there is no limitation on the shape or size. For example, the cross-sectional shape may be circular, and it is preferable that the diameter be larger than that of the second fiber.

Here, the second fiber guide may further be formed with a tapered portion (410) to prevent the first fiber or second fiber that has been inserted from being lifted during the transport process of the guide block. The tapered portion may have a structure in which the width thereof is gradually changed in the machine direction at the end inserted into the bearing groove, and specifically, as shown in FIG. 2, it is formed such that the machine direction width of the second fiber guide decreases based on the insertion direction of the second fiber.

In general, the first fiber guide and the second fiber guide play a role of inserting fibers into the cross groove and the bearing groove, respectively, but also play a role of pressing the inserted fibers to prevent them from being lifted. However, when the inserted fibers pass through the first fiber guide or the second fiber guide during the transport process of the guide block, the force pressing the fibers momentarily disappears, so the inserted fibers may be lifted. In particular, since the fibers are in the form of thin filaments being woven together, this lifting phenomenon may be aggravated.

The above-mentioned tapered portion is intended to prevent this phenomenon, so that when the guide block that has passed through the first guide passes through the second guides, the fibers, especially the first fibers, that are in an excited state may be aligned or clumped together downward along the tapered portion when they collide with the tapered portion formed in the second guides. Accordingly, not only is it possible to prevent the filaments from becoming entangled or detaching from the grooves of the guide blocks, but also to increase the cohesion of the fibers, thereby further increasing the mechanical properties of the grating being manufactured.

In the present invention, the resin injection part (500) is formed at the machine direction end of the frame as shown in FIGS. 1, 2 and 12, and a grating can be manufactured by injecting a polymer resin into the guide block into which the first fiber and the second fiber are inserted and hardening it through heat treatment.

Specifically, the resin injection part (500) includes an upper mold (510) formed to extend in the machine direction on the upper surface of the frame and provided to cover the upper surface of the guide block; a lower mold (520) formed to extend in the machine direction between the frames and provided to cover the lower surface of the guide block; and one or more resin injection holes (530) formed to penetrate the upper surface of the upper mold; and the side surface of the guide block may be formed by the frame extending to the corresponding portion. In addition, the upper mold, the lower mold, and the frame may be provided as one piece to prevent the resin from leaking out of the corresponding mold during the resin injection process.

The above resin injection unit can pass through the above guides and continuously pass through a plurality of guide blocks into which the first fiber and the second fiber are inserted. During the passage process, when resin is injected through the resin injection unit as shown in Fig. 12, the resin enters the cross grooves and bearing grooves of the guide block and fills the grooves.

The resins thus filled can be hardened by heat applied by the heating section described below the resin injection section, thereby producing a lattice-shaped grating. The produced grating undergoes post-processing, such as polishing described below, to remove unnecessary fibers and complete the grating with a smooth surface.

The present invention includes a method for manufacturing a fiber-reinforced plastic grating using the automatic continuous production device for grating as described above. At this time, the method for manufacturing the fiber-reinforced plastic may include the steps of: a) introducing a guide block having a plurality of cross grooves and bearing grooves formed perpendicularly to each other on the upper surface into the automatic continuous production device for grating as described above, and inserting first fibers and second fibers into the cross grooves and bearing grooves, respectively; b) passing the guide block of step a) through a resin injection unit and filling the cross grooves and bearing grooves with resin; and c) removing the resin from the guide block and then polishing the surface.

In the present invention, the step a) is a step of inserting the first fiber and the second fiber into the cross groove and the bearing groove of the guide block, respectively, and the guide blocks are continuously fed in a single row into the above-described automatic continuous production device for grating, and are transported in the machine direction while repeatedly stopping or moving according to the sliding movement and stopping of the first fiber guide of the device. During the transport process, the first fiber and the second fiber are crossed and laminated on the guide block while passing through the first fiber guide and the second fiber guide, and a plurality of layers of such fibers can be formed.

At this time, the first fiber or second fiber inserted into the guide block is intended to improve the mechanical properties of the grating, and in particular, serves to increase the breaking strength and reduce brittleness.

The above first fiber or second fiber is not limited in terms of the material and fineness of the fiber, the length of the fiber, or the number of filaments in a bundle form. For example, the fiber may be one or more selected from glass fiber, carbon fiber, basalt fiber, metal fiber, and aromatic polyamide (aramid).

Specifically, the first fiber or the second fiber is preferably a mixture of glass fiber and other fibers, and particularly preferably a mixture of basalt fiber or aramid. Here, the basalt fiber is similar to the glass fiber in chemical properties. That is, both glass and basalt are amorphous materials with silica as a main component. Comparing general glass fiber and basalt fiber, glass fiber is composed of various components and has a low density of about 2.6 to 2.7 g/cm3, but basalt fiber has high strength and high heat resistance, and has excellent functions when used as a composite material.

Moreover, basalt fibers have the advantages of excellent mechanical properties and economic efficiency compared to expensive but brittle carbon fibers because they have the characteristics of moderate strength per unit area, high oxidation resistance, electrical insulation, easy processability and raw material procurement, and very low price.

In addition, the above aramid fiber has a structure in which a benzene ring is bonded between amide groups, and is divided into meta and para aramid fibers depending on the bonding position with the benzene ring. In the present invention, both meta and para aramid fibers can be used, and para aramid fibers are more preferably used.

The above aramid fiber has the advantages of excellent tensile strength, wear resistance, durability, etc., and when it is mixed into a grating resin, the unique properties of aramid as mentioned above can be imparted to the grating, and also, because of the low thermal conductivity of aramid, the insulation performance can be improved.

As described above, when the first or second fiber is a mixture of glass fiber and other fibers, the mixing ratio is not limited, but it is preferable that the glass fiber and other fibers are mixed in a weight ratio of 4 to 6: 6 to 4. If the content of glass fiber is outside the above range, the physical properties of the grating, particularly the weight or brittleness, may increase.

The above first fiber or second fiber may have a form in which a plurality of filaments are woven together, and its length may be 1 to 100 mm, preferably 3 to 40 mm, and its cross-sectional diameter or thickness may be 1 to 50 μm, preferably 10 to 40 μm. However, the specifications of the above fibers may be adjusted to an optimal range depending on the intended use of the grating or mechanical properties, particularly tensile strength, bending strength, etc., and the present invention is not limited thereto.

In addition, it is preferable that the first fiber or the second fiber be impregnated with the polymer resin before being inserted into the cross groove and the bearing groove. This is because the first fiber or the second fiber is a filament-bonded fiber, so if it is used as is without being impregnated with the polymer resin, the resin may not penetrate between the filaments during the resin filling step. This may lower the mechanical properties of the completed grating, so it is preferable that the first fiber or the second fiber be impregnated with the polymer resin before being inserted into the cross groove and the bearing groove before forming the fiber layer.

When a plurality of fiber layers formed by the intersection of the first fiber and the second fiber in the cross groove and bearing groove of the guide block as described above are formed, the guide block of step a) can be passed through the resin injection part to fill the cross groove and bearing groove with resin.

The above resin includes a polymer resin commonly used in the art for manufacturing fiber-reinforced plastics, and may specifically be a mixture in which an additive is mixed into a thermosetting resin.

The thermosetting resin is not limited in type and may include, for example, epoxy resin, phenol resin, unsaturated imide resin, unsaturated polyester resin, cyanate resin, isocyanate resin, benzoxazine resin, oxetane resin, allyl resin, dicyclopentadiene resin, silicone resin, triazine resin, melamine resin, urea resin, and furan resin. These resins may be used alone or in mixtures of two or more, and in addition, known thermosetting resins may be used. Among these, epoxy resins are preferable from the viewpoints of workability, moldability, and manufacturing cost.

As the epoxy resin, for example, novolac-type epoxy resins such as cresol novolac-type epoxy resin, phenol novolac-type epoxy resin, naphthol novolac-type epoxy resin, aralkyl novolac-type epoxy resin, and biphenyl novolac-type epoxy resin; bisphenol-type epoxy resins such as bisphenol A type epoxy resin, bisphenol F type epoxy resin, bisphenol AD type epoxy resin, bisphenol S type epoxy resin, bisphenol T type epoxy resin, bisphenol Z type epoxy resin, and tetrabromobisphenol A type epoxy resin; biphenyl-type epoxy resin, tetramethylbiphenyl-type epoxy resin, triphenyl-type epoxy resin, tetraphenyl-type epoxy resin, naphthol aralkyl-type epoxy resin, naphthalenediol aralkyl-type epoxy resin, naphthol aralkyl-type epoxy resin, fluorene-type epoxy resin, epoxy resin having a dicyclopentadiene skeleton, epoxy resin having an ethylenically unsaturated group in the skeleton, and alicyclic epoxy resin; diglycidyl ether compounds of polyfunctional phenols; These include hydrogen additives, etc. Epoxy resins may be used alone, or two or more types may be used in combination from the viewpoint of mechanical properties and heat resistance.

The above additives include a curing agent and a curing accelerator for curing the thermosetting resin, and may include things that can improve mechanical properties or chemical properties, such as fillers, coupling agents, and solvents.

The curing agent may, when the thermosetting resin is an epoxy resin, include a curing agent for epoxy resins such as a phenol-based curing agent, a cyanate ester-based curing agent, an acid anhydride-based curing agent, an amine-based curing agent, and an active ester group-containing compound. In addition, when the thermosetting resin is a resin other than an epoxy resin, a known curing agent for the thermosetting resin may be used. One type of curing agent may be used alone, or two or more types may be used in combination.

As the above phenol-based curing agent, there are no particular limitations, but preferably, a cresol novolac-type curing agent, a biphenyl-type curing agent, a phenol novolac-type curing agent, a naphthylene ether-type curing agent, a triazine skeleton-containing phenol-based curing agent, etc. can be mentioned.

As the above cyanate ester-based curing agent, there are no particular limitations, but examples thereof include bisphenol A dicyanate, polyphenol cyanate (oligo (3-methylene-1,5-phenylene cyanate), 4,4'-methylenebis (2,6-dimethylphenyl cyanate), 4,4'-ethylidenedipethyl dicyanate, hexafluorobisphenol A dicyanate, 2,2-bis (4-cyanate) phenylpropane, 1,1-bis (4-cyanate phenylmethane), bis (4-cyanate-3,5-dimethylphenyl) methane, 1,3-bis (4-cyanate phenyl-1- (methylethylidene)) benzene, bis (4-cyanate phenyl) thioether, bis (4-cyanate phenyl) ether, and the like.

As the above-mentioned acid anhydride type curing agent, there is no particular limitation, but examples thereof include phthalic anhydride, tetrahydrophthalic anhydride, hexahydrophthalic anhydride, methyltetrahydrophthalic anhydride, methylhexahydrophthalic anhydride, methylnadic anhydride, hydrogenated methylnadic anhydride, trialkyltetrahydrophthalic anhydride, dodecenyl succinic anhydride, 5-(2,5-dioxotetrahydro-3-furanyl)-3-methyl-3-cyclohexene-1,2-dicarboxylic anhydride, trimellitic anhydride, and pyromellitic anhydride.

As the above amine curing agent, there are no particular limitations, but examples thereof include aliphatic amines such as triethylenetetramine, tetraethylenepentamine, and diethylaminopropylamine; and aromatic amines such as metaphenylenediamine and 4,4'-diaminodiphenylmethane. In addition, urea resins and the like can also be used as curing agents.

The amount of the above-mentioned curing agent is not limited, but may be included in an amount of 10 to 100 parts by weight per 100 parts by weight of the thermosetting resin. If the amount exceeds the above range, curing may not occur properly or the brittleness of the grating may increase.

The curing accelerator may be a general curing accelerator used for curing the thermosetting resin. For example, when the thermosetting resin is an epoxy resin, examples of the curing accelerator include imidazole compounds and derivatives thereof; phosphorus compounds; tertiary amine compounds; quaternary ammonium compounds, etc. From the viewpoint of promoting the curing reaction, imidazole compounds and derivatives thereof are preferable.

Specific examples of imidazole compounds and derivatives thereof include 2-methylimidazole, 2-ethylimidazole, 2-undecylimidazole, 2-heptadecylimidazole, 2-phenylimidazole, 1,2-dimethylimidazole, 2-ethyl-1-methylimidazole, 1,2-diethylimidazole, 1-ethyl-2-methylimidazole, 2-ethyl-4-methylimidazole, 4-ethyl-2-methylimidazole, 1-isobutyl-2-methylimidazole, 2-phenyl-4-methylimidazole, 1-benzyl-2-phenylimidazole, 1-cyanoethyl-2-methylimidazole, 1-cyanoethyl-2-ethylimidazole, 1-cyanoethyl-2-phenylimidazole, Imidazole compounds, such as 1-cyanoethyl-2-ethyl-4-methylimidazole, 2-phenyl-4,5-dihydroxymethylimidazole, 2-phenyl-4-methyl-5-hydroxymethylimidazole, 2,3-dihydro-1H-pyrrolo[1,2-a]benzimidazole, 2,4-diamino-6-[2'-methylimidazolyl-(1')]ethyl-s-triazine, 2,4-diamino-6-[2'-undecylimidazolyl-(1')]ethyl-s-triazine, 2,4-diamino-6-[2'-ethyl-4'-methylimidazolyl-(1')]ethyl-s-triazine; modified imidazole compounds, such as isocyanatemaskimimidazole and epoxymaskimimidazole; Examples thereof include salts of the above imidazole compounds with trimellitic acid, such as 1-cyanoethyl-2-phenylimidazolium trimellitate; salts of the above imidazole compounds with isocyanuric acid; salts of the above imidazole compounds with hydrobromic acid, and the like. Among these, modified imidazole compounds are preferable, and isocyanate-masked imidazoles are more preferable. The imidazole compounds may be used singly or in combination of two or more.

The amount of the above-mentioned curing accelerator added is not limited, but it is preferable to include 0.1 to 10 parts by weight per 100 parts by weight of the thermosetting resin. If the amount exceeds the above range, curing may not occur properly or the breaking strength of the grating may decrease due to an increase in hardness.

The above filler is intended to increase the impermeability and wear resistance of the grating, and also has the effect of increasing thermal stability by reducing the coefficient of thermal expansion.

Examples of the fillers include oxides such as silica, aluminum oxide, zirconia, mullite, and magnesia; hydroxides such as aluminum hydroxide, magnesium hydroxide, and hydrotalcite; nitride ceramics such as aluminum nitride, silicon nitride, and boron nitride; natural minerals such as talc, montmorillonite, and saponite; metal particles, carbon particles, and the like. Among these, oxides and hydroxides are preferable, silica and aluminum hydroxide are more preferable, and aluminum hydroxide is even more preferable.

It is preferable to include 1 to 10 parts by weight of the above-mentioned filler per 100 parts by weight of the thermosetting resin in order to express the above-mentioned physical properties.

The above coupling agent is added to improve the dispersion of thermosetting resin and other components, especially fillers, and to enhance the mechanical properties of the grating, and its type is not limited, but a silane-based coupling agent is preferred.

As the silane coupling agent, aminosilane coupling agent [for example, 3-aminopropyltrimethoxysilane, N-(2-aminoethyl)-3-aminopropyltriethoxysilane, etc.], epoxysilane coupling agent [for example, 3-glycidoxypropyltrimethoxysilane, 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, etc.], phenylsilane coupling agent, alkylsilane coupling agent, alkenylsilane coupling agent [for example, vinylsilane coupling agent such as vinyltrichlorosilane, vinyltriethoxysilane, etc.], alkynylsilane coupling agent, haloalkylsilane coupling agent, siloxane coupling agent, hydrosilane coupling agent, silazane coupling agent, alkoxysilane coupling agent, chlorosilane coupling agent, (meth)acrylsilane coupling agent, Examples of coupling agents include aminosilane coupling agents, isocyanurate silane coupling agents, ureide silane coupling agents, mercaptosilane coupling agents, sulfide silane coupling agents, and isocyanate silane coupling agents. Among these, epoxy silane coupling agents are preferable, and 3-glycidoxypropyltrimethoxysilane is more preferable.

It is preferable that the above coupling agent be included in an amount of 0.1 to 1 part by weight per 100 parts by weight of the thermosetting resin. If the content of the coupling agent is outside the above range, the above-described effect may not be properly expressed or the surface hardness of the grating may deteriorate.

The above solvent is added to improve the workability of the resin, and is not limited to any type as long as it can dissolve and effectively mix the above-described components.

Examples of the solvents include alcohol solvents such as methanol, ethanol, propanol, butanol, methyl cellosolve, butyl cellosolve, propylene glycol monomethyl ether, ethylene glycol monoethyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, and tripropylene glycol monomethyl ether; ketone solvents such as acetone, methyl ethyl ketone, methyl isobutyl ketone, butanone, cyclohexanone, and 4-methyl-2-pentanone; ester solvents such as ethyl acetate, butyl acetate, and propylene glycol monomethyl ether acetate; ether solvents such as tetrahydrofuran; aromatic solvents such as toluene, xylene, and mesitylene; nitrogen atom-containing solvents such as N,N-dimethylformamide, N,N-dimethylacetamide, and N-methylpyrrolidone. Examples thereof include sulfur atom-containing solvents such as dimethyl sulfoxide. Among these, from the standpoint of solubility, ketone solvents are preferable, cyclohexanone, methyl ethyl ketone, and methyl isobutyl ketone are more preferable, and cyclohexanone and methyl ethyl ketone are even more preferable.

The above step b) does not limit the curing conditions of the resin. These curing conditions can be determined according to the type of resin used, the type of additives such as a curing agent, their composition ratio, etc. For example, when a latent curing agent such as an acid anhydride is used, it is preferable to apply a temperature of 150 to 200°C, and when an alicyclic diamine curing agent is used, it is preferable to apply a temperature of 120°C or higher, preferably 150 to 250°C.

As described above, the resin (molded product) manufactured through heat curing can be removed from the guide block and the surface can be polished to manufacture grating. At this time, before polishing the surface, unnecessary fibers can be removed first, and then the surface of the grating can be cleaned by mechanical or chemical polishing.

The automatic continuous production device for grating according to the present invention continuously moves a guide block, which is a mold, while repeating stopping and moving when manufacturing fiber-reinforced plastic grating, and continuously supplies fibers to grooves formed in the guide block in accordance with the stopping or moving of the guide block, thereby improving productivity and efficiently carrying out automation compared to existing grating devices. In addition, since the supply and drawing of fibers and the injection and curing of resin are carried out simultaneously in one device, more uniform gratings can be efficiently produced.

As described above, although the present invention has been described with specific details such as specific components and limited examples and drawings, it is provided only to help a more general understanding of the present invention, and the present invention is not limited to the above-described examples, and those with ordinary knowledge in the field to which the present invention pertains can make various modifications and variations from this description. Therefore, the spirit of the present invention should not be limited to the described embodiments, and all things that are equivalent or equivalent to the following claims as well as the claims fall within the scope of the spirit of the present invention.

1: 1st fiber
2: Second fiber
100 : Guide block
110 : Cross goal
120 : Bearing bone
200 : Frame
210 : Auxiliary Frame
300: 1st fiber guide
310 : Crossbar
320: First penetration hole
400: 2nd fiber guide
410 : Tapered section
420: Second penetration hole
500 : Resin injection part
510 : Upper mold
520 : Lower mold
530 : Resin injection hole
600 : Heating part

Claims (8)

An automatic continuous production device for grating that manufactures grating using a guide block in which a number of cross grooves and bearing grooves are formed perpendicular to each other on the upper surface, the device,
A pair of frames extending in the machine direction and spaced apart from each other by a certain distance so as to allow the guide block to pass in the machine direction;
A first fiber guide inserted into the cross-goal of the above guide block and sliding along the cross-goal to supply a first fiber to the cross-goal;
A second fiber guide inserted into the bearing groove of the above guide block and supplying a second fiber to the bearing groove; and
A resin injection unit formed at the machine direction end of the above frame and injecting a polymer resin into the guide block into which the first fiber and the second fiber are inserted;
A grating automatic continuous production device, characterized in that the guide block stops when the first fiber is supplied by the first fiber guide, and moves in the machine direction so that the first fiber guide can be inserted into the next cross groove when the first fiber is supplied.
In paragraph 1,
The above grating automatic continuous production device is,
A crossbar that slides the first fiber guide in the direction of forming the crossbone;
An automatic continuous production device for grating, characterized by further including:
In paragraph 1,
An automatic continuous production device for grating, characterized in that the second fiber guide has a tapered portion formed at the end inserted into the bearing groove, the width of which is gradually changed in the machine direction.
In paragraph 1,
The above grating automatic continuous production device is,
A heating unit formed at the bottom of the above frame and provided so as to face the lower surface of the above guide block to heat-treat the above guide block;
An automatic continuous production device for grating, characterized by further including:
In paragraph 1,
The above resin injection part,
An upper mold formed to extend in the machine direction on the upper surface of the above frame and provided to cover the upper surface of the above guide block;
A lower mold formed to extend in the machine direction between the above frames and provided to cover the lower surface of the guide block; and
One or more resin injection holes formed to penetrate the upper surface of the upper mold;
An automatic continuous production device for grating, characterized by including:
a) A step of inserting a guide block having a plurality of cross grooves and bearing grooves formed orthogonally to each other on the upper surface into an automatic continuous production device for grating according to any one of claims 1 to 5, and inserting first fibers and second fibers into the cross grooves and bearing grooves, respectively;
b) a step of passing the guide block of step a) through the resin injection part to fill the cross groove and bearing groove with resin; and
c) A step of polishing the surface after removing the above resin from the guide block;
A method for manufacturing a fiber-reinforced plastic grating, characterized by including a.
In paragraph 6,
A method for manufacturing a fiber-reinforced plastic grating, characterized in that the first fiber, the second fiber, or both of them include one or more fibers selected from glass fibers, carbon fibers, basalt fibers, metal fibers, and aromatic polyamide fibers.
In paragraph 6,
A method for manufacturing a fiber-reinforced plastic grating, characterized in that the resin comprises one or more selected from epoxy resin, phenol resin, unsaturated imide resin, unsaturated polyester resin, cyanate resin, isocyanate resin, benzoxazine resin, oxetane resin, allyl resin, dicyclopentadiene resin, silicone resin, triazine resin, melamine resin, urea resin, and furan resin.