阅读说明：本技术 一种规则截面的单向纤维增强树脂体的制备方法和设备 (Preparation method and equipment of unidirectional fiber reinforced resin body with regular cross section ) 是由 朱华平 田宇飞 沃晓剑 于 2020-07-10 设计创作，主要内容包括：一种规则截面的单向纤维增强树脂体的制备方法和设备,一组挤出设备模头以挤出的方式将热熔树脂涂覆在热熔树脂涂抹引导辊辊面,形成一层厚度均匀的热熔树脂膜层；将连续纤维与热熔树脂融合浸渍单元,沿其宽度方向通过分束,集成和冷却定型装置,制成至少一组规则截面的单向纤维增强树脂体子单元；或者采用至少一组分离、冷却、定型呈一体的模腔单元装置,将连续纤维与热熔树脂融合浸渍单元,沿其宽度方向分离出至少一片连续的薄片式单向纤维增强树脂体子单元；通过横向切割装置将规则截面的单向纤维增强树脂体子单元或薄片式单向纤维增强树脂体子单元切割成一定长度的规则截面的或者薄片式的单向纤维增强树脂体。(A preparation method and equipment of unidirectional fiber reinforced resin body with regular section, a group of extrusion equipment die heads coat hot melt resin on the roller surface of a hot melt resin smearing guide roller in an extrusion mode to form a layer of hot melt resin film with uniform thickness; the continuous fiber and hot melt resin fusion impregnation unit is made into at least one group of unidirectional fiber reinforced resin body subunits with regular sections through beam splitting, integration and cooling shaping devices along the width direction of the unit; or at least one group of die cavity unit devices which are integrated with separation, cooling and shaping are adopted to fuse and impregnate the continuous fibers and the hot melt resin, and at least one continuous slice type unidirectional fiber reinforced resin body subunit is separated along the width direction of the unit; and cutting the unidirectional fiber reinforced resin body subunits with regular sections or the sheet type unidirectional fiber reinforced resin body subunits into unidirectional fiber reinforced resin bodies with regular sections or sheet types with certain lengths by a transverse cutting device.)

1. The equipment for preparing the unidirectional fiber reinforced resin body with the regular cross section is characterized in that an open continuous fiber and hot melt resin rolling and impregnating device consisting of a hot melt resin smearing guide roller and a plurality of grades of impregnating unit modules which are alternately arranged in parallel in a series manner and have a delta-shaped structure is adopted;

the group of extrusion equipment die heads coat hot-melt resin on the roller surface of the hot-melt resin smearing guide roller in an extrusion mode to form a layer of hot-melt resin film with uniform thickness;

the hot melt resin smearing guide rollers are driven independently, the rotating speed of the hot melt resin smearing guide rollers can be set independently, and a layer of hot melt resin film layer with uniform thickness coated on the roller surface of a group of hot melt resin smearing guide rollers is synchronously smeared on a row of unidirectional continuous uniformly flattened fiber bodies through the rotating motion of the hot melt resin smearing guide rollers;

a row of unidirectional continuous uniformly-flattened fibrous bodies preliminarily fused with hot melt resin enter an open continuous fiber and hot melt resin rolling, impregnating and coating device consisting of a plurality of stages of serially-connected parallel and alternately-arranged triangular structure impregnating and coating unit modules, so that the hot melt resin and the fibers are fully and effectively fused.

At least one group of beam splitting, integrating and cooling molding die cavity unit devices are adopted to fuse and impregnate the continuous fibers and the hot melt resin, and at least one group of continuous unidirectional fiber reinforced resin body sheets are separated along the width direction of the continuous fiber and hot melt resin fusion and impregnation unit.

2. The apparatus for producing a unidirectional fiber-reinforced resin body with a regular cross section according to claim 1, wherein a group of hot melt resin application guide rollers and a group of die head devices of an extrusion apparatus are respectively provided on the upper and lower sides of a row of unidirectional continuous uniformly flattened fiber bodies;

continuously coating the hot-melt resin provided by a corresponding group of die heads of the extrusion equipment on the roller surface of the hot-melt resin coating guide roller through an upper hot-melt resin coating guide roller and a lower hot-melt resin coating guide roller respectively to form a layer of hot-melt resin film with uniform thickness;

respectively coating a layer of hot-melt resin film with uniform thickness coated on the roller surfaces of the upper hot-melt resin coating guide roller and the lower hot-melt resin coating guide roller on the upper side and the lower side of a row of unidirectional continuous uniformly-flattened fibrous bodies through the rotating motion of the upper hot-melt resin coating guide roller and the lower hot-melt resin coating guide roller;

a row of unidirectional continuous evenly-flattened fibrous bodies coated with hot-melt resin on the upper side and the lower side respectively enter an open continuous fiber and hot-melt resin rolling impregnation device consisting of a plurality of stages of serially-connected parallel and alternately-arranged triangular structure impregnation unit modules, so that the hot-melt resin and the fibrous bodies are fully and effectively fused.

3. The apparatus for preparing an unidirectional fiber reinforced resin body with a regular cross section according to claim 1, wherein a group of hot melt resin coating guide rollers and a group of extrusion device die head devices are arranged on the upper portion of a row of unidirectional continuous uniform spreading fiber bodies, and simultaneously, a group of hot melt resin extrusion device die head devices are arranged only on the lower portion of a row of unidirectional continuous uniform spreading fiber bodies.

4. The apparatus for producing a unidirectional fiber reinforced resin body with a regular cross section according to claim 1, wherein a reference surface of an outlet lip of a die head of the extrusion apparatus is parallel to an axis of the hot melt resin application guide roller, and a position of the hot melt resin film extrusion die head of the extrusion apparatus is set in such a manner that a clearance between the outlet lip of the die head of the extrusion apparatus and the roller surface of the hot melt resin application guide roller is set within a range of 0.1 to 10mm and an angle between the die head of the extrusion apparatus and a horizontal plane is set within a range of 10 to 150 degrees, based on the roller surface of the hot melt resin application guide roller.

5. The apparatus for preparing a regular cross-section unidirectional fiber reinforced resin body according to claim 1, wherein the open continuous fiber and hot melt resin roll impregnation device is composed of a plurality of impregnation unit modules in a delta structure, which are arranged in parallel in a staggered manner in series, each impregnation unit module is composed of three groups of impregnation applicator rollers in a delta structure;

the dipping unit modules of the triangle structure formed by the three groups of smearing rollers are respectively in two arrangement forms of a genuine triangle structure and an inverted triangle structure, and are arranged in series according to the genuine triangle structure and the inverted triangle structure in an interval, parallel and staggered manner;

the position of the top smearing roller of the right triangular dipping unit module and the position of the dipping smearing roller at the bottom of the inverted triangular dipping unit module are adjusted, so that the adjustment of the center distance between the three groups of dipping smearing rollers of each dipping smearing unit module is realized.

6. The apparatus for producing a unidirectional fiber reinforced resin body of regular cross section according to claim 5, wherein a wrap angle of a row of unidirectional continuous uniformly flattened fibers and the application roller is set by adjusting the center distance of the impregnation application roller of the impregnation unit module; the wrap angle of the one-row unidirectional continuous uniformly flattened fibers and a coating roller at the top of the prime character structure dipping unit module or the wrap angle of the one-row unidirectional continuous uniformly flattened fibers and a coating roller at the bottom of the reverse character structure dipping unit module is set within a range of 15-180 degrees;

the adjustment of the gaps among the roll surfaces of the three groups of smearing rollers of each dipping unit module is realized by adjusting the center distance of the smearing rollers of the unit modules; the setting range of the gap between the top smearing roller of the same regular-product-shaped structural impregnation unit module and the roller surfaces of the two adjacent groups of impregnation smearing rollers or the gap between the bottom smearing roller of the same reverse-product-shaped structural impregnation unit module and the roller surfaces of the two adjacent groups of smearing rollers is 0.1-15 mm;

by adjusting the center distance of the soaking and coating rollers of the unit modules and setting the gap between the soaking and coating rollers of the unit modules, the proper fiber tension required by effective fusion of a row of unidirectional, continuous and uniform flattened fibers and hot-melt resin and the pressure for fusion of the hot-melt resin into a bundle of fibers which are arranged closely are obtained.

7. The apparatus for producing a regular-section unidirectional fiber reinforced resin body according to claim 1, wherein the hot-melt resin application guide roller and each set of rollers constituting each stage of the impregnation unit modules are provided with a built-in heating structure; the built-in heating can be a tubular electric heating element inserted into the inner cavity of the roller; or a liquid heating medium passing through built-in passages of the rollers.

8. The apparatus for preparing unidirectional fiber reinforced resin with regular cross section according to claim 1, wherein the spindle nose rotation support pairs at both ends of the coating roller at the top of the genuine product or the bottom of the inverted product of each dip coating unit module are respectively connected with a linearly movable transmission pair device, so as to realize the independent adjustment of the center distance of the three dip coating rollers of each product unit module, and each dip coating roller group adopts a chain wheel or a gear to transmit the rotation motion at the spindle nose at the transmission side.

9. The apparatus for preparing unidirectional fiber reinforced resin body with regular cross section according to claim 7, wherein a plurality of groups of radiant heating devices are respectively arranged on the upper and lower parts of the open continuous fiber and hot melt resin rolling impregnation device composed of the multi-stage serial, parallel and alternate arranged delta-shaped structural impregnation and coating unit modules to provide hot melt resin and a row of unidirectional continuous and uniform flattened fiber bodies, and the heat required by the effective fusion of the hot melt resin coating and the row of flattened fiber bodies in the process of the multi-stage serial, alternate and parallel arranged impregnation and coating unit modules is provided.

10. The apparatus for producing a unidirectional fiber-reinforced resin body having a regular cross section according to claim 1, further comprising a flattening device for flattening the bundle of continuous fibers in a regular and uniform manner in the width direction of the passing member by bringing the bundle of continuous fibers in a row of bundles of fibers into contact with the geometrically curved surface of the passing member under a tension applied to the bundle of fibers at a predetermined wrap angle;

the back of the yarn passing component is provided with a reinforcing structural part, and the arching degree of the yarn passing component along the vertical direction of a geometric generatrix of the yarn passing component is adjusted through a jacking component arranged in the back reinforcing structural part and is fixed; the camber or the depth of the yarn passing component in the vertical direction of the geometric generatrix of the yarn passing component is within a set value range of 0.05-5.0 mm by taking the process center line of production line preparation equipment as a reference;

11. the apparatus for producing a unidirectional fiber reinforced resin body having a regular cross section according to claim 10, wherein the back structure-reinforcing member is provided with at least two sets of jack-up mechanisms, the jack-up mechanisms are supported by the reinforcing member, and adjust the degree of arching of the geometric curved surface of the over-yarn member, and at the same time, connect and fix the over-yarn member and the reinforcing member;

suitable cross-sectional geometrical curves of a contact area of the yarn passing member and a row of continuous fibers consisting of a plurality of bundles of fibers in a wrap angle mode comprise semicircular, partial arc, full circle or SIGN curves;

the yarn passing component is provided with a built-in heating element, and the built-in heating element can be a tubular electric heating element inserted into the inner cavity of the yarn passing component or a liquid heating medium is adopted to heat through a channel arranged on the yarn passing component.

12. The apparatus for producing a unidirectional fiber reinforced resin body having a regular cross section as claimed in claim 11, wherein the flattening means is composed of three sets of members, two of which are fixed position yarn passing members and one of which is adjustable position yarn passing members, and are arranged in a V-shaped configuration; the center distance among the three groups of components is changed by adjusting the position of the over-yarn flattening component at the bottom of the V-shaped structure, and the wrap angle between the fiber body and the working unit component and the tension of the fiber body are changed.

13. The apparatus for producing a unidirectional fiber-reinforced resin body having a regular cross section according to claim 11, further comprising an electrifying means for generating an electric charge of the same kind by friction with the fiber body using a friction member made of a material different from that of said fiber body; the friction member material comprises a metal material of copper, steel and aluminum alloy, or a non-metal material of ceramic, nylon and hard rubber;

the friction member performs repeated contact type friction motion on the surfaces of the unidirectional continuous flattening fibers in a row through the actuator, and further performs uniform flattening on the unidirectional continuous fibers in the row through repulsive force between charges of the same type generated between adjacent fibers in the unidirectional continuous flattening fiber body in the row through the friction motion

The head geometric configuration of the friction member in contact with the surface of a row of unidirectional continuously flattened filaments comprises: a spherical body, a semi-spherical body, a spherical segment body, a cylinder, a semi-cylinder, a small semi-cylinder, or a continuous three-dimensional geometric curved surface, or a continuous two-dimensional geometric curved surface;

the actuator driving the friction member unit includes a driving element powered by electricity, air or hydraulic pressure.

14. The apparatus for producing a unidirectional fiber reinforced resin body with a regular cross section according to claim 1, wherein at least one set of cavity units is adopted, which is integrated with splitting, integrating, cooling and shaping; wherein, each group of separated cooling and shaping die cavity units are arranged in a staggered manner in the height direction, so that the separated adjacent sheet type unidirectional fiber reinforced resin body subunits are correspondingly arranged in a staggered manner in the height direction.

15. The apparatus for producing a unidirectional fiber-reinforced resin body with a regular cross-section according to claim 1, wherein at least one set of longitudinal separating and shaping cooling cavity units is used to uniformly separate a row of continuous fibers and a hot-melt resin fused unit body into at least one sheet-like unidirectional fiber-reinforced resin body subunit in the width direction thereof;

a group of longitudinal separating and shaping cooling die cavity units, which consists of a pair of rollers with concave and convex surfaces coupled; wherein, the roller is internally provided with a cooling water channel and is connected with a temperature adjustable cold water system.

16. The apparatus for producing a regular-section unidirectional fiber-reinforced resin body as claimed in claim 1, wherein the split cavity is formed by dividing the continuous fiber unit, which is to be fused with the hot-melt resin, into the split cavity in the width direction thereof, the cross-sectional dimension of the split cavity in the length direction thereof being continuously decreased;

the beam splitting die cavity is open, the integrated die cavity enables at least one group of unit beams formed by fusing continuous fibers and hot-melt resin to pass through the integrated die cavities at corresponding positions respectively, and the unidirectional fiber reinforced resin body is subjected to regular cross section press-fitting and shaping; wherein, the cross section of the integrated die cavity along the length direction is a geometric cylinder with continuously decreasing size;

the integrated die cavity is at least provided with a group of raised steps along the length direction of the integrated die cavity, and the hot pressing of the unit bundle formed by fusing the continuous fibers and the hot-melt resin is enhanced;

and (3) a cooling and shaping die cavity, namely passing at least one group of integrated continuous fiber and hot melt resin fused unit bodies through the cooling and shaping die cavity with a built-in cooling water channel respectively to further press and cool and shape the unidirectional fiber reinforced resin unit bundle.

17. The apparatus for producing a regular cross-section unidirectional fiber reinforced resin body as claimed in claim 1, wherein the split cavity and the integrated cavity are respectively provided with temperature-adjustable heat source means; the heat source of the heat source device comprises an electric heating pipe, or a liquid heat transfer medium and the like; the cooling shaping die cavity is internally provided with a cooling water runner and is connected with a water cooler with adjustable temperature.

18. The method for preparing the regular-section unidirectional fiber reinforced resin body according to any one of claims 1 to 17, comprising the steps of:

s1: a plurality of bundles of fibers are synchronously sent into a unidirectional continuous fiber primary carding device through a yarn placing rotating shaft which is arranged on a creel and can be respectively arranged by the tension of each bundle of fibers, and then the fiber bundles are fluffed through an oven;

s2, uniformly spreading the continuous fiber tows arranged in a plurality of bundles along the surface of the convex geometric body of the tension roller under the tension action of the fiber ordered tension flattening device; meanwhile, the repulsion force between the same charges generated among the fiber yarns by the mechanical yarn scraping electrostatic generating device further uniformly flattens the continuous fiber tows arranged in a plurality of bundles;

s3, coating the extruded hot melt resin on the roller surface of a hot melt resin coating guide roller by a group of extrusion equipment die heads in a coating mode to form a layer of hot melt resin film with uniform thickness;

s4, synchronously coating a layer of hot melt resin film with uniform thickness on the roller surface of a group of hot melt resin coating guide rollers on a row of unidirectional continuous uniformly flattened fibers through the rotation motion of the hot melt resin coating guide rollers;

s5, enabling a row of unidirectional continuous evenly-flattened fibers primarily fused with hot-melt resin to enter a multi-stage tandem, parallel interactive and open type continuous fiber and hot-melt resin rolling impregnation device to realize effective fusion of the hot-melt resin and the fibers;

s6: a row of unidirectional continuous evenly-flattened fiber bodies formed by effectively fusing continuous fibers and hot-melt resin continuously pass through at least one group of longitudinal separation and shaping cooling devices under the driving action of main traction, so that a row of continuous fibers and hot-melt resin fusion units are evenly separated along the width direction of the continuous fibers and the hot-melt resin fusion units, and are cut off according to the set length through a transverse cutting device, and the fiber reinforced resin body with the regular cross section is obtained.

Technical Field

The invention belongs to the technical field of long fiber reinforced thermoplastic composite materials, and particularly relates to a preparation method and equipment of a unidirectional fiber reinforced resin body with a regular cross section and a fixed length.

Background

Various fiber-reinforced resin composite materials are gradually replacing traditional metal materials, and are widely applied to various fields requiring light weight, including various vehicles such as airplanes and automobiles.

With the application development of fiber reinforced thermoplastic composite materials, long glass fiber reinforced polypropylene (LFT) materials are gradually popularized due to excellent physical properties of the LFT materials. The method is widely applied to a plurality of fields such as transportation, civil and military aviation, petrochemical industry, sports equipment, building materials and the like. The purposes of light product weight, high strength, corrosion resistance, recyclability and convenient processing and forming are achieved, and due to the excellent comprehensive performance, the industry is developed vigorously.

At present, according to the LFT technology on the market, the problems of broken glass fibers, hairiness and the like are easily caused by the infiltration of the die head, meanwhile, the content of the glass fibers exceeding 60 percent is difficult to achieve due to the fact that the glass fibers need to pass through an infiltration groove due to the forming mechanism of the die head infiltration, meanwhile, flame retardants on the market such as polyphosphate and the like are poor in temperature resistance, the infiltration of the die head needs to be carried out at high temperature, the flame retardants are easily decomposed in the infiltration die head, and the flame retardant performance of the LFT long glass fiber reinforcement cannot be achieved.

According to the preparation process and the preparation equipment of the unidirectional fiber reinforced resin body with the regular cross section and the fixed length, unidirectional continuous fibers do not need to pass through an extruder, the condition of fiber damage is avoided, the content is not limited and controlled by the extruder, a very large adjustable space is provided, the high-temperature requirements of a flame retardant can be met by the processing temperature, the material residence time and the like, 30-85% of LFT products can be prepared, and meanwhile, the flame-retardant reinforced LFT material can be prepared.

Disclosure of Invention

In order to realize the purpose, the invention provides a preparation method and equipment of a unidirectional fiber reinforced resin body with a regular cross section, which adopts an open continuous fiber and hot melt resin rolling impregnation device consisting of a hot melt resin smearing guide roller and a plurality of grades of parallel and alternately arranged triangular structure impregnation unit modules in a serial form; the group of extrusion equipment die heads coat hot-melt resin on the roller surface of the hot-melt resin smearing guide roller in an extrusion mode to form a layer of hot-melt resin film with uniform thickness; the hot melt resin smearing guide rollers are driven independently, the rotating speed of the hot melt resin smearing guide rollers can be set independently, and a layer of hot melt resin film layer with uniform thickness coated on the roller surface of a group of hot melt resin smearing guide rollers is synchronously smeared on a row of unidirectional continuous uniformly flattened fiber bodies through the rotating motion of the hot melt resin smearing guide rollers;

then, a row of unidirectional continuous uniformly flattened fiber bodies preliminarily fused by hot melt resin enter an open continuous fiber and hot melt resin rolling, dipping and smearing device consisting of a delta-shaped structure dipping and smearing unit modules which are arranged in series in a multistage parallel interaction manner; the full and effective fusion of the hot-melt resin and the fiber is realized;

then, the continuous fiber and hot melt resin fusion impregnation unit is made into at least one group of unidirectional fiber reinforced resin body subunits with regular sections through beam splitting, integration and cooling shaping die cavity devices along the width direction of the unit;

and finally, cutting the unidirectional fiber reinforced resin body subunits with the regular cross sections into unidirectional fiber reinforced resin bodies with the regular cross sections and a certain length by a transverse cutting device.

Furthermore, a group of hot melt resin smearing guide rollers and a group of extrusion equipment die head devices are respectively arranged on the upper side and the lower side of the row of unidirectional, continuous and uniform flattened fiber bodies; continuously coating the hot-melt resin provided by a corresponding group of die heads of the extrusion equipment on the roller surface of the hot-melt resin coating guide roller through an upper hot-melt resin coating guide roller and a lower hot-melt resin coating guide roller respectively to form a layer of hot-melt resin film with uniform thickness; respectively coating a layer of hot-melt resin film with uniform thickness coated on the roller surfaces of the upper hot-melt resin coating guide roller and the lower hot-melt resin coating guide roller on the upper side and the lower side of a row of unidirectional continuous uniformly-flattened fibrous bodies through the rotating motion of the upper hot-melt resin coating guide roller and the lower hot-melt resin coating guide roller; a row of unidirectional continuous evenly-flattened fibrous bodies preliminarily fused with hot-melt resin enter an open continuous fiber and hot-melt resin rolling impregnation device consisting of a triangular structure impregnation unit module which is in multi-stage parallel interaction and arranged in series, so that the hot-melt resin and the fibrous bodies are fully and effectively fused;

further, a group of hot melt resin smearing guide rollers and a group of die head devices of extrusion equipment are arranged at the upper part of the row of unidirectional continuous uniform fiber spreading bodies; meanwhile, only one group of die head devices of hot melt resin extrusion equipment is arranged at the lower part of a row of unidirectional, continuous and uniform flattened fiber bodies; coating a layer of hot melt resin film with uniform thickness on the surface of the hot melt resin coating guide roller on one side of the upper part of a row of unidirectional continuous uniformly flattened fibers by the rotary motion of the upper hot melt resin coating guide roller; meanwhile, uniformly extruding and coating hot melt resin on one side of the lower part of the row of unidirectional continuous uniformly-flattened fibers by a group of extrusion equipment die heads arranged on the lower part of the row of unidirectional continuous uniformly-flattened fibers;

further, the reference surface of the outlet lip of the die head of the extrusion equipment is parallel to the axis of the hot melt resin coating guide roller, and the position of the hot melt resin film extrusion die head of the extrusion equipment is set according to the set angle and the set gap by taking the roller surface of the hot melt resin coating guide roller as the reference; the setting range of the gap between the outlet lip of the hot-melt resin film extrusion die head of the extrusion equipment and the roller surface of the hot-melt resin smearing guide roller is 0.1-10 mm; the included angle between the hot-melt resin film extrusion die head of the extrusion equipment and the horizontal plane is set within the range of 10-150 degrees;

furthermore, the open continuous fiber and hot melt resin rolling impregnation device is composed of a plurality of impregnation unit modules with a delta-shaped structure which are arranged in parallel in a serial connection mode in a staggered mode; each dipping unit module is arranged in a delta-shaped structure by three groups of dipping smearing rollers; the dipping unit module of a Chinese character 'pin' structure consisting of three groups of coating rollers is respectively in two arrangement forms of a genuine Chinese character 'pin' structure and an inverted Chinese character 'pin' structure; the impregnation unit modules are arranged in series in an interval, parallel and staggered mode according to the genuine character structure and the inverted character structure;

furthermore, the center distance between the three groups of dipping and smearing rollers of each dipping and smearing unit module is adjusted by adjusting the positions of the top smearing roller of the right delta-shaped dipping and smearing unit module and the position of the dipping and smearing roller at the bottom of the reverse delta-shaped dipping and smearing unit module; setting wrap angles of a row of unidirectional continuous uniformly flattened fibers and the coating roller by adjusting the center distance of the coating roller of the dipping unit module; the wrap angle of the one-row unidirectional continuous uniformly flattened fibers and a coating roller at the top of the prime character structure dipping unit module or the wrap angle of the one-row unidirectional continuous uniformly flattened fibers and a coating roller at the bottom of the reverse character structure dipping unit module is set within a range of 15-180 degrees;

furthermore, the adjustment of the gaps among the roll surfaces of the three groups of smearing rollers of each dipping unit module is realized by adjusting the center distance of the smearing rollers of the unit modules; the setting range of the gap between the top smearing roller of the same regular-product-shaped structural impregnation unit module and the roller surfaces of the two adjacent groups of impregnation smearing rollers or the gap between the bottom smearing roller of the same reverse-product-shaped structural impregnation unit module and the roller surfaces of the two adjacent groups of smearing rollers is 0.1-15 mm; by adjusting the center distance of the coating rollers of the unit modules and setting the gap between the impregnating and coating rollers of the unit modules, the proper fiber tension required by effective fusion of a row of unidirectional, continuous and uniform flattened fibers and hot-melt resin and the pressure for fusion of the hot-melt resin into a bundle of closely arranged fibers are obtained;

furthermore, the hot-melt resin coating guide roller and each group of rollers forming each stage of impregnation unit module are provided with built-in heating structures; the built-in heating can be a tubular electric heating element inserted into the inner cavity of the roller; or a liquid heating medium passing through a roller built-in channel; if hot oil is used as a heating medium, the end part of the shaft head at the transmission side of the hot oil is connected with an external heat supply source through a rotary joint device;

furthermore, shaft head rotating support pairs at two ends of the coating roller at the top of the genuine character or the bottom of the inverted character of each dipping and coating unit module are respectively connected with a linearly movable transmission pair device, so that the independent adjustment of the center distance of the three dipping and coating rollers of each unit module group is realized; further, each group of dipping and smearing rollers adopts a chain wheel or a gear to transmit rotary motion at a shaft head on the transmission side of the dipping and smearing rollers;

furthermore, a plurality of groups of radiation type heating devices can be respectively arranged at the upper part and the lower part of an open continuous fiber and hot melt resin rolling impregnation device consisting of the multistage parallel interaction, series-connected triangular structure impregnation coating unit modules, so as to provide hot melt resin and a row of unidirectional continuous uniformly-flattened fiber bodies, and the heat required by the effective fusion of the hot melt resin coating and the row of flattened fibers in the multistage, interactive parallel and series-connected impregnation coating unit module process is provided;

furthermore, the beam splitting, integrating and cooling shaping die cavity device adopts at least one group of die cavity units integrating beam splitting, integrating and cooling shaping into a whole, and each group of separated cooling shaping die cavity units are arranged in a staggered manner in the height direction, so that the separated adjacent sheet type unidirectional fiber reinforced resin body subunits are also arranged in a corresponding staggered manner in the height direction;

further, at least one group of longitudinal separation and shaping cooling die cavity units are adopted to uniformly separate a row of continuous fibers and hot melt resin fusion unit bodies along the width direction of the unit bodies, and at least one slice-type unidirectional fiber reinforced resin body subunit is separated;

furthermore, a group of longitudinal separating and shaping cooling die cavity units consists of a pair of rollers with concave and convex surfaces coupled; wherein, a flow passage of cooling water is arranged in the roller; and is connected with a cold water system with adjustable temperature;

further, the beam splitting die cavity uniformly divides the continuous fiber units fused with the hot melt resin into at least one group of unit beams of which the continuous fibers are effectively fused with the hot melt resin along the width direction of the continuous fiber units; wherein, the size of the cross section of the beam splitting die cavity along the length direction is continuously reduced;

further, the beam splitting die cavity is open;

further, at least one group of unit bundles formed by fusing continuous fibers and hot-melt resin respectively pass through the integrated die cavities at corresponding positions to carry out pressing and shaping on the regular sections of the unidirectional fiber reinforced resin body; the integrated die cavity is a geometric cylinder with the cross section size along the length direction of the integrated die cavity continuously decreasing; the integrated die cavity is at least provided with a group of raised steps along the length direction of the integrated die cavity, and the hot pressing of the unit bundle formed by fusing the continuous fibers and the hot-melt resin is enhanced; the cooling shaping die cavity is used for enabling at least one group of integrated continuous fibers and hot-melt resin fused unit bodies to pass through the cooling shaping die cavity with a built-in cooling water channel respectively, and further pressing, cooling and shaping are carried out on the unidirectional fiber reinforced resin unit bundles;

furthermore, the beam splitting and integrating die cavity device is respectively provided with a heat source device with adjustable temperature; wherein, the heat source of the heat source device comprises an electric heating pipe or a liquid heat transfer medium; the cooling shaping die cavity is internally provided with a cooling water runner and is connected with a water cooler with adjustable temperature.

The device further comprises a flattening device, wherein a row of continuous fiber bodies formed by a plurality of bundles of fibers are tensioned to the bundles of fibers by a set wrap angle, and the continuous fiber bodies are regularly and uniformly flattened along the width direction of the continuous fiber bodies by contacting with a geometric curved surface of a yarn passing member; wherein, the back of the yarn passing component is provided with a reinforced structural part; the arching degree of the yarn passing component along the vertical direction of the geometric generatrix thereof is adjusted through a jacking component arranged in the back reinforcing structural component, and the yarn passing component is fixed; the camber or the depth of the yarn passing component in the vertical direction of the geometric generatrix of the yarn passing component is within a set value range of 0.05-5.0 mm by taking the process center line of production line preparation equipment as a reference; the back structure reinforcing part is provided with at least two groups of jacking mechanisms; the jacking mechanism takes the reinforcing component as a support and adjusts the arching degree of the geometric curved surface of the yarn passing component; meanwhile, the yarn passing component is connected and fixed with the reinforcing component; suitable cross-sectional geometrical curves of a contact area of the yarn passing member and a row of continuous fibers consisting of a plurality of bundles of fibers in a wrap angle mode comprise semicircular, partial arc, full circle or SIGN curves; the yarn passing component is provided with a built-in heating element; the built-in heating element can be a tubular electric heating element inserted into the inner cavity of the yarn passing member; or heating by adopting a liquid heating medium through a channel arranged on the yarn passing component;

furthermore, the flattening device consists of three groups of components; wherein, two groups are fixed yarn passing components, and one group is adjustable yarn passing components and is arranged according to a V-shaped structure; the position of the yarn passing and flattening component at the bottom of the V-shaped structure is adjusted, the center distance among the three groups of components is changed, and the wrap angle between the fiber body and the working unit component and the tension of the fiber body are changed;

further, the device also comprises a friction member made of a material different from the fiber body, and an electrification device for generating the same charge to the friction of the fiber body; wherein the friction member material comprises a metal material of copper, steel or aluminum alloy, or a non-metal material of ceramic, nylon or hard rubber;

further, the friction member performs repeated contact type friction motion on the surfaces of a row of unidirectional and continuous flattened fiber yarns through an actuator; repulsive force among the same charges is generated among all the fiber yarns of the unidirectional continuous flattening fiber body in the row through friction motion, and the unidirectional continuous fiber yarns in the row are further flattened uniformly;

furthermore, the geometric structure of the head part of the friction member, which is contacted with the surface of the row of unidirectional continuous flattened fiber yarns, comprises a spherical body, a semi-spherical body, a spherical segment body, a cylinder, a semi-cylinder, a small semi-cylinder, or a continuous three-dimensional geometric curved surface, or a continuous two-dimensional geometric curved surface;

further, the actuator that drives the friction member unit includes a driving element powered by electricity, air, or hydraulic pressure.

The invention also provides a preparation method of the unidirectional fiber reinforced resin body with the regular cross section, which comprises the following steps:

s1: a plurality of bundles of fibers are synchronously sent into a unidirectional continuous fiber primary carding device through a yarn placing rotating shaft which is arranged on a creel and can be respectively arranged by the tension of each bundle of fibers, and then the fiber bundles are fluffed through an oven;

s2, uniformly spreading the continuous fiber tows arranged in a plurality of bundles along the surface of the convex geometric body of the tension roller under the tension action of the fiber ordered tension flattening device; meanwhile, the repulsion force between the same charges generated among the fiber yarns by the mechanical yarn scraping electrostatic generating device further uniformly flattens the continuous fiber tows arranged in a plurality of bundles;

s3, coating the extruded hot melt resin on the roller surface of a hot melt resin coating guide roller by a group of extrusion equipment die heads in a coating mode to form a layer of hot melt resin film with uniform thickness;

s4, synchronously coating a layer of hot melt resin film with uniform thickness on the roller surface of a group of hot melt resin coating guide rollers on a row of unidirectional continuous uniformly flattened fibers through the rotation motion of the hot melt resin coating guide rollers;

s5, enabling a row of unidirectional continuous evenly-flattened fibers primarily fused with hot-melt resin to enter a multi-stage tandem, parallel interactive and open type continuous fiber and hot-melt resin rolling impregnation device to realize effective fusion of the hot-melt resin and the fibers;

s6: a row of unidirectional continuous evenly-flattened fiber bodies, in which the continuous fibers and the hot-melt resin are effectively fused, are evenly divided into at least one bundle of continuous fiber and hot-melt resin fused subunits through a beam splitting die cavity along the width direction of the fiber bodies under the driving action of main traction; then at least one bundle of continuous fibers and hot melt resin fusion subunit is manufactured through an integration and cooling shaping die cavity unit device; then, the resin is cut into pieces of a predetermined length by a crosscutting device to obtain a unidirectional fiber-reinforced resin body having a predetermined length and a high fiber content and a regular cross section.

The invention also provides a preparation method of the fixed-length flake-type high-fiber-content unidirectional fiber reinforced resin body, which comprises the following steps of:

s1: a plurality of bundles of fibers are synchronously sent into a unidirectional continuous fiber primary carding device through a yarn placing rotating shaft which is arranged on a creel and can be respectively arranged by the tension of each bundle of fibers, and then the fiber bundles are fluffed through an oven;

s2, uniformly spreading the continuous fiber tows arranged in a plurality of bundles along the surface of the convex geometric body of the tension roller under the tension action of the fiber ordered tension flattening device; meanwhile, the repulsion force between the same charges generated among the fiber yarns by the mechanical yarn scraping electrostatic generating device further uniformly flattens the continuous fiber tows arranged in a plurality of bundles;

s3, coating the extruded hot melt resin on the roller surface of a hot melt resin coating guide roller by a group of extrusion equipment die heads in a coating mode to form a layer of hot melt resin film with uniform thickness;

s4, synchronously coating a layer of hot melt resin film with uniform thickness on the roller surface of a group of hot melt resin coating guide rollers on a row of unidirectional continuous uniformly flattened fibers through the rotation motion of the hot melt resin coating guide rollers;

s5, enabling a row of unidirectional continuous evenly-flattened fibers primarily fused with hot-melt resin to enter a multi-stage tandem, parallel interactive and open type continuous fiber and hot-melt resin rolling impregnation device to realize effective fusion of the hot-melt resin and the fibers;

s6: under the driving action of main traction, a row of unidirectional continuous uniformly flattened fiber bodies formed by effectively fusing continuous fibers and hot melt resin continuously pass through at least one group of longitudinal separation, shaping and cooling devices, and a row of continuous fibers and hot melt resin fusion units are uniformly separated along the width direction of the fusion units; thereafter, the resin sheet is cut into pieces of a predetermined length by a cross cutting device, thereby obtaining a sheet-like unidirectional fiber-reinforced resin body of a predetermined length.

By adopting the technical scheme, the invention achieves the following effects: the unidirectional fiber reinforced resin body with regular section and fixed length and high fiber content is prepared.

Drawings

FIG. 1 is a schematic structural diagram of a hot melt resin extrusion die and a hot melt resin application guide roller arranged on two sides in combination with a multi-stage tandem, parallel interactive, open continuous fiber and hot melt resin rolling impregnation application device according to an embodiment of the present invention;

FIG. 1a is a schematic view of a configuration of an embodiment of the present invention in which a set of a hot-melt resin extrusion die and a hot-melt resin application guide roller are arranged on one side;

FIG. 1b is a schematic structural view of an embodiment of the present invention, in which a hot-melt resin extrusion die head is arranged up and down, and a hot-melt resin application guide roller is arranged at the lower part of the hot-melt resin extrusion die head;

FIG. 1c is a schematic structural view of an embodiment of the present invention, in which a hot-melt resin extrusion die head is arranged up and down, and a hot-melt resin application guide roller is provided at the upper part;

FIG. 2 is a schematic diagram of a structural view of a genuine character structural impregnation unit module roll according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a reverse delta-shaped structural impregnation unit module roller according to an embodiment of the invention;

FIG. 4 is a schematic view of an apparatus for manufacturing a unidirectional continuous fiber reinforced resin composite according to an embodiment of the present invention;

FIG. 5 is a sectional view of a split, integrated, cooling and setting apparatus for forming a thin sheet type fiber reinforced resin body according to an embodiment of the present invention;

FIG. 6 is a schematic view of a splitting, integrating and cooling-sizing apparatus for forming a fiber reinforced resin body of regular cross-section according to an embodiment of the present invention;

FIG. 7 is a front view of a set of flattened unit modules of an embodiment of the present invention;

FIG. 8 is a side view of a set of flattened unit modules of an embodiment of the present invention;

FIG. 9 is a front view of a friction fiber charging apparatus according to an embodiment of the present invention;

FIG. 10 is a top view of a friction fiber charging apparatus according to an embodiment of the present invention;

FIG. 11 is a force analysis graph of the change in tension before and after the fiber passes through the nip roll according to an embodiment of the present invention

The device comprises a continuous fiber row consisting of a plurality of fiber bundles, a fiber flattening unit module 21, a first fiber flattening unit module, a fiber flattening unit module 22, a second fiber flattening unit module 23, a third fiber flattening unit module 24, a yarn passing component 25, a back structure reinforcing component 26, a jacking mechanism 3, a die head for extruding molten resin, a die head 31 for extruding molten resin, a die head for extruding molten resin arranged at the lower part of the continuous fiber, a hot melt resin coating guide roller 4, a hot melt resin coating guide roller 41, a hot melt resin coating guide roller arranged at the lower part of the continuous fiber, a genuine product character structure impregnation unit module 5, a genuine product character structure impregnation unit module 6, a reverse character structure impregnation unit module 7, a cooling device 80, a yarn unwinding rack 81, a carding rack 82, an oven 83, a friction fiber electrification device 83-1, a friction component 83-2, a reciprocating motion mechanism 84, a beam splitting die cavity, The device comprises a heating channel of a beam splitting die cavity, 85, a heat insulation structure body, 86, an integrated die cavity, 86-1, a heating channel of the integrated die cavity, 87, a cooling and shaping die cavity, 87-1, a cooling channel of the cooling and shaping die cavity, 88, a crawler-type traction mechanism, 88-1, a compression roller type traction mechanism, 89, a transverse cutting mechanism, 90, a longitudinal separation and shaping cooling device and 90-1 rollers with concave and convex surfaces coupled.

Detailed Description

The present invention is further illustrated by the following specific examples, which are, however, not intended to limit the scope of the invention.