Thermoplastic composite material rib pulling and twisting forming processing system and method

Abstract

The invention provides a thermoplastic composite material rib pulling and twisting forming machining system and method, and belongs to the field of composite material machining. The system comprises a first gear assembly, a second gear assembly, a third gear assembly and a cutting assembly which are sequentially arranged in the advancing direction of materials to be machined; a first crawler tractor is arranged between the first gear assembly and the second gear assembly, a water cooling assembly is arranged between the second gear assembly and the third gear assembly, and a second crawler tractor is arranged between the third gear assembly and the cutting assembly. The first gear assembly is provided with an isolation winding assembly, the second gear assembly is provided with a high-elastic component assembly, the third gear assembly is provided with a stripping assembly, and a heating device is arranged between the high-elastic component assembly and the water cooling assembly. The method has remarkable effectiveness in multiple aspects of reducing the porosity of the rib material, increasing the compactness, improving the wettability of the thermoplastic resin to the fibers, improving the volume fraction of the fibers in the rib material and the like.

Description

Technical Field

[0001] The invention relates to the technical field of composite materials, and in particular to a thermoplastic composite material tendon drawing and twisting forming processing system and method. Background Art

[0002] Composite materials are materials composed of two or more different materials that complement each other in performance to achieve performance that is difficult to achieve with a single material. The advantages of composite materials include: light weight, high strength, corrosion resistance, fatigue resistance, designability, etc. Compared with thermosetting composite materials, thermoplastic composite reinforcements prepared by composite pultrusion technology have advantages such as long-term room temperature storage, secondary processing, and recyclability, and have broad application prospects in civil engineering and other fields. At present, it is difficult to strictly control the internal porosity of the reinforcement in thermoplastic composite pultrusion, especially the melt pultrusion process of polypropylene and nylon-based thermoplastic composite reinforcements for civil engineering, resulting in a high internal porosity of the reinforcement, which makes it difficult to further improve the tensile and shear mechanical properties of the reinforcement. On the other hand, due to the excessive viscosity of polypropylene and nylon, the resin has a poor impregnation effect on the fiber bundle, and the volume fraction of the composite fiber prepared by the melt method is generally around 50%. The excessively high resin viscosity makes it difficult to further increase the fiber volume fraction. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a thermoplastic composite material tendon drawing and forming processing system and method, so as to solve the technical problem that the performance of the existing thermoplastic composite material tendons is difficult to be further improved due to high porosity, low volume fraction and low resin fiber impregnation degree in the preparation process of the melting method, which specifically includes:

[0004] A thermoplastic composite material tendon twisting and forming processing system, comprising: a first gear assembly, a second gear assembly, a third gear assembly and a cutting assembly arranged in sequence according to the traveling direction of the material to be processed, a first crawler traction machine is arranged between the first gear assembly and the second gear assembly, a water cooling assembly is arranged between the second gear assembly and the third gear assembly, and a second crawler traction machine is arranged between the third gear assembly and the cutting assembly;

[0005] An isolation winding assembly is arranged on the first gear assembly, a high-elastic component assembly is arranged on the second gear assembly, a stripping assembly is arranged on the third gear assembly, and a heating device is arranged between the high-elastic component assembly and the water cooling assembly.

[0006] Optionally, the first gear assembly, the second gear assembly and the third gear assembly have the same structure:

[0007] The first gear assembly includes: a gear motor, a driving wheel and a driven wheel; the gear motor drives the driven wheel to rotate through the driving wheel, a through hole is arranged at the center of the driven wheel, and the material to be processed is supported to pass through the through hole;

[0008] The material to be processed passes through the central axis of the driven wheel of the first gear assembly, the central axis of the driven wheel of the second gear assembly, and the central axis of the driven wheel of the third gear assembly in sequence;

[0009] The isolation winding assembly comprises: an isolation tape, an adapter and a winding roller;

[0010] The winding roller is mounted on the side wall of the driven wheel of the first gear assembly through the adapter;

[0011] The isolation belt is arranged on the winding roller. When the driven wheel of the first gear assembly rotates, the first crawler traction machine moves the material to be processed, and the first isolation belt spirally winds the material to be processed.

[0012] Optionally, the high-elastic component assembly includes: a high-elastic component, a first receiving roller, a first annular positioner and a first rotating motor;

[0013] The fixed end of the first rotating motor is mounted on the end surface of the driven wheel of the second gear assembly away from the third gear assembly;

[0014] The first receiving roller is connected to the output end of the first rotating motor, and the high elastic component is wound and installed on the first receiving roller;

[0015] The material to be processed after being wound around the high-elastic component passes through the first annular positioner, and the first annular positioner is used to fasten the material to be processed after being wound around the high-elastic component.

[0016] Optionally, the heating device is installed on the central axis of the driven wheel of the second gear assembly and passes through the center of the driven shaft of the second gear assembly. The material to be processed after being fastened by the first annular locator is fed into the cavity of the first heating device for electric heating.

[0017] Optionally, the water cooling component sprays water on the processed materials passing through the heating device through a nozzle.

[0018] Optionally, the stripping assembly includes: a second receiving roller, a second annular positioner, and a second rotating motor;

[0019] The fixed end of the second rotating motor is mounted on the end surface of the driven wheel of the third gear assembly close to the second gear assembly;

[0020] The second receiving roller is mounted at the output end of the second rotating motor;

[0021] The material to be processed sprayed by the water cooling component passes through the second annular positioner, and then the high-elastic component wound on the material to be processed is recovered and wound by the second receiving roller;

[0022] The second annular positioner is used to prevent the high-elastic component wound on the material to be processed from loosening before recovery;

[0023] The second crawler traction machine is used to drive the material to be processed to move in the moving direction.

[0024] Optionally, the cutting assembly includes: a moving unit, a third rotating motor and a cutting saw blade;

[0025] The fixed end of the third rotating motor is mounted on the moving unit, and the cutting saw blade is mounted on the output end of the third rotating motor;

[0026] The moving unit supports and drives the third rotating motor to move back and forth along the straight line of the material to be processed.

[0027] Optionally, the system further comprises a wire guide assembly, the wire guide assembly comprising: a creel, a roller, and two wire guide plates;

[0028] A plurality of rollers are arranged on the yarn frame, a plurality of material belts are installed on the drum, and the material belts on all the rollers are supported to pass through two wire guide plates in sequence.

[0029] Optionally, the cross-sectional shape of the high-elastic component is circular, rectangular, elliptical or polygonal, and the material of the high-elastic component is metal hinge, metal tension spring, high-temperature resistant silicone rubber, fluorosilicone rubber, fluororubber, hydrogenated nitrile rubber, butyl rubber or acrylate rubber;

[0030] The material to be processed is a thermoplastic composite material rib;

[0031] The resin in the thermoplastic composite material rib is polypropylene, polyethylene, high-density polyethylene, nylon, polyetheretherketone, polyimide, polyvinyl fluoride, polystyrene, polycarbonate, polyoxymethylene, polyether, polyetherimide or polyphenylene sulfide;

[0032] The fibers in the thermoplastic composite reinforcement are glass fibers, basalt fibers, aramid fibers, carbon fibers, liquid crystal fibers, polypropylene fibers, polyamide fibers, polyester fibers, polyimide fibers, polyphenylene sulfide fibers, polyarylate fibers or poly(p-phenylene benzobisazole) fibers.

[0033] A thermoplastic composite material tendon twisting forming processing method, applied to the thermoplastic composite material tendon twisting forming processing system, comprising:

[0034] When the material to be processed is an unformed thermoplastic composite material bar, the guide wire assembly is installed at the head end of the thermoplastic composite material bar drawing and forming processing system:

[0035] S1, the guide wire assembly combines multiple material strips into the material to be processed;

[0036] S2, the first crawler tractor and the second crawler tractor simultaneously pull the material to be processed in the moving direction;

[0037] S3, the driven wheel of the first gear assembly rotates so that the isolation belt is spirally wound around the material to be processed passing through the first gear assembly;

[0038] S4, when the material to be processed after being wound with the isolation belt enters the position of the corresponding high-elastic component assembly, the driven wheel of the second gear assembly rotates to drive the high-elastic component to spirally wind around the current material to be processed, and at the same time, the first rotating motor drives the first receiving roller to rotate so that the first receiving roller releases the high-elastic component;

[0039] S5, when the material to be processed after being wound with the high-elastic component moves into the heating device, it is electrically heated;

[0040] S6. The electrically heated material to be processed is sent to the bottom of the water cooling component to be sprayed for cooling;

[0041] S7, after the cooled material to be processed passes through the second annular positioner, the second receiving roller peeled off by the peeling assembly recovers the high elastic component wound on the material to be processed;

[0042] S8, the material to be processed after the high-elastic component is stripped is cut by a cutting assembly;

[0043] When the material to be processed is a molded thermoplastic composite material bar, the molded thermoplastic composite material bar is directly used as the material to be processed to implement the above steps S2 to S8.

[0044] Compared with the prior art, the above technical solution has at least the following beneficial effects:

[0045] The present invention proposes a stretching and twisting forming technical method based on the basic principles of bionics, and refers to the action of snakes in nature to wrap and twist their prey when catching their prey. In the preparation process of thermoplastic composite reinforcement, a high-elastic material is stretched and then a pre-tightening force is applied to the material so that the material is wrapped around the surface of the thermoplastic composite reinforcement. When the reinforcement is heated and molten, the high-elastic material elastically shrinks and applies a twisting force to the reinforcement. The technical creativity is strong and has great novelty.

[0046] The method for preparing thermoplastic composite reinforcement by stretching and forming proposed in the present invention is significantly effective in reducing the porosity of the reinforcement, increasing the density, improving the impregnation of the thermoplastic resin into the fiber, and increasing the volume fraction of the fiber inside the reinforcement.

[0047] The present invention can be used to directly mold prepreg tapes to prepare thermoplastic composite material bars, and can also improve the performance of formed composite material bars. Both technical routes can obtain thermoplastic composite material bars with excellent comprehensive mechanical properties, and the technical feasibility is good.

[0048] The method for preparing thermoplastic composite reinforcement by stretching and forming proposed by the present invention can naturally press out ribs on the surface of the composite reinforcement, which is convenient for anchoring and stably connecting the reinforcement with a matrix such as concrete, and has good product availability.

[0049] The stretch forming process proposed in the present invention can realize the manufacture of variable diameter thermoplastic composite material tendons by changing and adjusting parameters such as the number and width of thermoplastic prepreg tapes, which effectively solves the technical problem that pultrusion forming cannot produce variable diameter composite material tendons, and the material has good designability.

[0050] The stranding forming process proposed in the present invention is not limited to the production of straight reinforcement configurations, and can realize the production of various types of bent reinforcements through further modification of the device. The device has good modifiability and strong technical scalability.

[0051] Compared with pultrusion, the stranding molding device used in the present invention does not require mold design and mold modification, thus saving costs related to mold design, modification, maintenance, etc.

[0052] The twisting forming device and method adopted by the present invention are free from the limitation of the mold, so the surface of the thermoplastic composite reinforcement will not produce problems such as wear and fuzzing caused by the friction of the mold.

[0053] In summary, the invention has strong technical creativity, good novelty, good technical feasibility, good product availability, good material designability, good device modifiability, strong technical scalability, and saves mold-related costs and related problems caused by friction between materials and molds. The invention has significant effectiveness in reducing the porosity of reinforcement materials, increasing density, improving the impregnation of thermoplastic resins on fibers, and increasing the volume fraction of fibers inside reinforcement materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0055] Figure 1 It is a schematic diagram of processing of unformed materials to be processed (case 1);

[0056] Figure 2 The processing diagram of the formed material to be processed (case 2);

[0057] Figure 3 Typical displacement load curves for the shear strength test of short beams of untwisted and twisted materials to be processed;

[0058] Figure 4 It is a bar chart comparing the test results of short beam shear strength of the material to be processed before and after twisting;

[0059] Figure 5 It is a physical picture of the material to be processed before and after being twisted;

[0060] Figure 6 Schematic diagram of the structure of three gear components.

[0061] Reference numerals:

[0062] M, material to be processed; m, material belt;

[0063] 1. First gear assembly; 2. Second gear assembly; 3. Third gear assembly; a. Driven wheel; b. Driving wheel; c. Gear motor;

[0064] 4. The first crawler tractor; 5. The second crawler tractor;

[0065] 61. Isolation tape; 62. Adapter; 63. Winding roller;

[0066] 71. High elastic component; 72. First receiving roller; 73. First annular positioner; 74. First rotating motor;

[0067] 8. Heating device; 9. Water cooling assembly;

[0068] 101, second storage roller; 102, second annular positioner; 103, second rotating motor;

[0069] 111, moving unit; 112, third rotating motor; 113, cutting saw blade;

[0070] 121. Creel; 122. Roller; 123. Wire guide plate. DETAILED DESCRIPTION

[0071] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0072] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one", "one" or "the" do not indicate a quantitative limitation, but indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0073] It should be noted that the terms "up", "down", "left", "right", "front" and "back" used in the present invention are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0074] In order to solve the technical problem that the performance of existing thermoplastic composite reinforcements is difficult to be further improved due to high porosity, low volume fraction and low resin fiber impregnation during the preparation process of the melting method, the present invention provides a thermoplastic composite reinforcement drawing and forming processing system and method.

[0075] The basic principle of the thermoplastic composite tendon twisting and forming processing system and method is similar to the action of winding and twisting the prey by a snake when catching its prey. In the preparation process of the thermoplastic composite tendon, the high elastic material is stretched and a pre-tightening force is applied to make it wrapped around the surface of the thermoplastic composite tendon; when the tendon is heated and molten, the high elastic material elastically shrinks and exerts a twisting force on the tendon.

[0076] The twisting action has at least three beneficial effects: first, under the twisting force, the air in the internal pores of the reinforcement is squeezed out, the porosity of the reinforcement is reduced, and the density is increased; second, under the twisting force, the resin inside the reinforcement flows to the fiber surface that is not impregnated with resin or has poor impregnation effect, thereby achieving better impregnation of the thermoplastic resin with the fiber; third, the excess resin inside the reinforcement is squeezed out, and the volume fraction of the fiber inside the reinforcement is increased. Finally, under the twisting force generated by the shrinkage of the high elastic material, the internal porosity of the composite reinforcement is reduced, the resin impregnation degree of the fiber is improved, the fiber volume fraction is increased, and the mechanical properties of the thermoplastic composite reinforcement are significantly improved.

[0077] The preparation process of the composite material reinforcement stranding method can be divided into two routes according to the implementation object: 1. Direct stranding of thermoplastic prepreg to prepare composite reinforcement (i.e., unformed thermoplastic composite reinforcement); 2. Formed thermoplastic composite reinforcement (i.e., unformed thermoplastic composite reinforcement) is stranded to achieve performance improvement. The specific scheme is as follows:

[0078] like Figures 1 to 6 As shown, a thermoplastic composite material tendon twisting and forming processing system comprises: a first gear assembly, a second gear assembly, a third gear assembly and a cutting assembly are sequentially arranged according to the traveling direction of the material to be processed, a first crawler traction machine is arranged between the first gear assembly and the second gear assembly, a water cooling assembly is arranged between the second gear assembly and the third gear assembly, and a second crawler traction machine is arranged between the third gear assembly and the cutting assembly;

[0079] An isolation winding assembly is arranged on the first gear assembly, a high-elastic component assembly is arranged on the second gear assembly, a stripping assembly is arranged on the third gear assembly, and a heating device is arranged between the high-elastic component assembly and the water cooling assembly.

[0080] The first gear assembly, the second gear assembly and the third gear assembly have the same structure:

[0081] The first gear assembly includes: a gear motor, a driving wheel and a driven wheel; the gear motor drives the driven wheel to rotate through the driving wheel, a through hole is arranged at the center of the driven wheel, and the material to be processed is supported to pass through the through hole;

[0082] The material to be processed passes through the central axis of the driven wheel of the first gear assembly, the central axis of the driven wheel of the second gear assembly, and the central axis of the driven wheel of the third gear assembly in sequence;

[0083] The isolation winding assembly comprises: an isolation tape, an adapter and a winding roller;

[0084] The winding roller is mounted on the side wall of the driven wheel of the first gear assembly through the adapter;

[0085] The isolation belt is arranged on the winding roller. When the driven wheel of the first gear assembly rotates, the first crawler traction machine moves the material to be processed, and the first isolation belt spirally winds the material to be processed.

[0086] In a specific implementation scheme, the components on the same straight line in the system are: the driven wheel of the first gear assembly, the first crawler tractor, the first annular positioner, the heating device, the driven wheel of the second gear assembly (wherein the heating device passes through the driven wheel of the second gear assembly), the second annular positioner, the driven wheel of the third gear assembly, the second crawler tractor and the cutting assembly; wherein the water cooling assembly is arranged above the material between the heating device and the second annular positioner. In addition, the present invention does not limit the various brackets of the components on the same straight line of the present application.

[0087] In a specific implementation manner, the high-elastic component assembly includes: a high-elastic component, a first receiving roller, a first annular positioner and a first rotating motor; the cross-sectional shape of the high-elastic component is circular, elliptical or polygonal, and the material of the high-elastic component is metal hinge, metal tension spring, high-temperature resistant silicone rubber, fluorosilicone rubber, fluororubber, hydrogenated nitrile rubber, butyl rubber or acrylate rubber;

[0088] The fixed end of the first rotating motor is installed on the end surface of the driven wheel of the second gear assembly away from the third gear assembly; the first receiving roller is connected to the output end of the first rotating motor, and the high-elastic component is wound and installed on the first receiving roller; the material to be processed after being wound around the high-elastic component passes through the first annular positioner, and the first annular positioner is used to tighten the material to be processed after being wound around the high-elastic component.

[0089] In a specific embodiment, the heating device is installed on the central axis of the driven wheel of the second gear assembly and passes through the center of the driven shaft of the second gear assembly. The material to be processed, which is fastened by the first annular locator, is fed into the cavity of the first heating device for electric heating.

[0090] In a specific implementation manner, the water cooling component sprays water on the processed material passing through the heating device through a nozzle.

[0091] In a specific embodiment, the stripping assembly includes: a second receiving roller, a second annular positioner, and a second rotating motor; the fixed end of the second rotating motor is mounted on the end face of the driven wheel of the third gear assembly close to the second gear assembly; the second receiving roller is mounted on the output end of the second rotating motor; the material to be processed sprayed by the water cooling assembly passes through the second annular positioner, and then the high elastic component currently wound on the material to be processed is recovered and wound by the second receiving roller; the second annular positioner is used to prevent the high elastic component wound on the material to be processed from loosening before recovery; the second crawler traction machine is used to drive the material to be processed to move in the direction of travel. The moving unit can be a structure that only moves back and forth in a straight line, such as a screw nut complex and a cylinder.

[0092] All power drive components in this system are controlled by the host computer and support electrical connection or signal connection with the host computer.

[0093] In a specific embodiment, the cutting assembly includes: a moving unit, a third rotating motor and a cutting saw blade; the fixed end of the third rotating motor is installed on the moving unit, and the output end of the third rotating motor is installed with the cutting saw blade; the moving unit supports and drives the third rotating motor to move back and forth in a straight line along the material to be processed.

[0094] In a specific embodiment, the system also includes a wire guide assembly, which includes: a yarn rack, a roller, two wire guide plates, and the related structures of the wire guide assembly. The through holes on the guide paper board are set according to the prior art and are not described in detail; multiple rollers are set on the yarn rack, and multiple material belts are installed on the rollers. The material belts on all rollers support passing through the two wire guide plates in sequence. The material to be processed is a thermoplastic composite tendon; the resin in the thermoplastic composite tendon is polypropylene, polyethylene, high-density polyethylene, nylon, polyetheretherketone, polyimide, polyvinyl fluoride, polystyrene, polycarbonate, polyformaldehyde, polyether, polyetherimide or polyphenylene sulfide; the fiber in the thermoplastic composite tendon is glass fiber, basalt fiber, aramid fiber, carbon fiber, liquid crystal fiber, polypropylene fiber, polyamide fiber, polyester fiber, polyimide fiber, polyphenylene sulfide fiber, polyarylate fiber or poly(p-phenylene benzobisazole) fiber.

[0095] A thermoplastic composite material tendon twisting forming processing method, applied to the thermoplastic composite material tendon twisting forming processing system, comprising:

[0096] When the material to be processed is an unformed thermoplastic composite material bar, the guide wire assembly is installed at the head end of the thermoplastic composite material bar drawing and forming processing system:

[0097] S1, the guide wire assembly combines multiple material strips into the material to be processed;

[0098] S2, the first crawler tractor and the second crawler tractor simultaneously pull the material to be processed in the moving direction;

[0099] S3, the driven wheel of the first gear assembly rotates so that the isolation belt is spirally wound around the material to be processed passing through the first gear assembly;

[0100] S4, when the material to be processed after being wound with the isolation belt enters the position of the corresponding high-elastic component assembly, the driven wheel of the second gear assembly rotates to drive the high-elastic component to spirally wind around the current material to be processed, and at the same time, the first rotating motor drives the first receiving roller to rotate so that the first receiving roller releases the high-elastic component;

[0101] S5, when the material to be processed after being wound with the high-elastic component moves into the heating device, it is electrically heated;

[0102] S6. The electrically heated material to be processed is sent to the bottom of the water cooling component to be sprayed for cooling;

[0103] S7, after the cooled material to be processed passes through the second annular positioner, the second receiving roller peeled off by the peeling assembly recovers the high elastic component wound on the material to be processed;

[0104] S8, the material to be processed after the high-elastic component is stripped is cut by a cutting assembly;

[0105] When the material to be processed is a molded thermoplastic composite material rib, the molded thermoplastic composite material rib is directly used as the material to be processed:

[0106] The first crawler tractor and the second crawler tractor simultaneously pull the material to be processed in the traveling direction;

[0107] The driven wheel of the first gear assembly rotates so that the isolation belt is spirally wound on the material to be processed passing through the first gear assembly;

[0108] When the material to be processed after being wound with the isolation belt enters the position of the corresponding high-elastic component assembly, the driven wheel of the second gear assembly rotates to drive the high-elastic component to spirally wind around the current material to be processed, and at the same time, the first rotating motor drives the first receiving roller to rotate so that the first receiving roller releases the high-elastic component;

[0109] After being wound with the high-elastic component, the material to be processed moves into the heating device and is electrically heated;

[0110] The electrically heated material to be processed is sent to the bottom of the water cooling component and sprayed to cool it down;

[0111] After the cooled material to be processed passes through the second annular positioner, the high elastic component wound on the material to be processed is recovered by the second receiving roller of the stripping assembly;

[0112] The material to be processed after the high-elastic component is stripped is cut by a cutting assembly.

[0113] The specific implementation process is as follows:

[0114] Scenario 1: For the preparation of composite reinforcement (unformed thermoplastic composite reinforcement) by direct drawing and twisting of thermoplastic prepreg tape, the preparation process includes:

[0115] Narrow tape cutting: A cutting machine is used to cut the wide thermoplastic prepreg tape into narrow tapes, which are wound on the surface of a roller and stored for future use;

[0116] Narrow belt traction: The roller wrapped with the narrow belt is installed on the creel, and the material belt is pulled from the creel. The two guide plates basically present a stacking state of circular cross section to obtain preliminary materials to be processed;

[0117] Isolation and wrapping: The preliminary material to be processed passes through the isolation winding component and is wrapped with an isolation belt to obtain the material to be processed wrapped with the isolation belt;

[0118] Primary pulling: the material to be processed after being wrapped with the isolation belt moves linearly in the direction of travel through the first crawler traction machine;

[0119] Twisting and pressurizing: When the first crawler tractor drives the material to be processed wrapped with the isolation belt to the position of the high-elastic component assembly, the high-elastic component twists and spirally wraps the material to be processed one circle at a time. The high-elastic component stretched with a certain tension wraps the material to be processed tightly to obtain the material to be processed wrapped with the high-elastic component. At this time, the outer layer of the material to be processed is sequentially provided with isolation belts and high-elastic components from the inside to the outside;

[0120] Hot-melt twisting: After the material to be processed wrapped with the high-elastic component reaches the heating device, the high-temperature electric heating is started to make the material to be processed wrapped with the high-elastic component reach a specific temperature, melt, and under the twisting force of the high-elastic component, the air and excess resin inside the prepreg tape are squeezed out to obtain the heated material to be processed;

[0121] Cooling and shaping: The heated material to be processed moves forward to the water cooling component, and the resin inside the material to be processed hardens and shapes after the material is cooled down;

[0122] Separating the ribs: The material to be processed after cooling moves forward to the stripping assembly, and the high-elastic component wrapped outside the ribs is pulled out from the surface of the ribs and separated from the ribs, obtaining the material to be processed after the high-elastic component is stripped;

[0123] Secondary pulling: After the high-elastic components are stripped, the material to be processed moves forward through the second crawler traction machine and reaches the cutting assembly.

[0124] Cutting and storing: the material to be processed after the high-elastic component is stripped off is cut and stored according to the required length to obtain the processed material.

[0125] For the preparation of composite reinforcement (unformed thermoplastic composite reinforcement) by direct drawing and twisting of thermoplastic prepreg tape, the preparation process includes:

[0126] Scenario 2: The performance improvement technology route of the formed thermoplastic composite reinforcement (formed material to be processed) is achieved through twisting and forming, and its preparation process includes:

[0127] Isolation and coating: The formed thermoplastic composite reinforcement is directly used as the preliminary material to be processed. The preliminary material to be processed is passed through an isolation winding assembly and coated with an isolation tape to obtain the material to be processed wrapped with the isolation tape;

[0128] Primary pulling: the material to be processed after being wrapped with the isolation belt moves linearly in the direction of travel through the first crawler traction machine;

[0129] Twisting and pressurizing: When the first crawler tractor drives the material to be processed wrapped with the isolation belt to the position of the high-elastic component assembly, the high-elastic component twists and spirally wraps the material to be processed one circle at a time. The high-elastic component stretched with a certain tension wraps the material to be processed tightly to obtain the material to be processed wrapped with the high-elastic component. At this time, the outer layer of the material to be processed is sequentially provided with isolation belts and high-elastic components from the inside to the outside;

[0130] Hot-melt twisting: After the material to be processed wrapped with the high-elastic component reaches the heating device, the high-temperature electric heating is started to make the material to be processed wrapped with the high-elastic component reach a specific temperature, melt, and under the twisting force of the high-elastic component, the air and excess resin inside the prepreg tape are squeezed out to obtain the heated material to be processed;

[0131] Cooling and shaping: The heated material to be processed moves forward to the water cooling component, and the resin inside the material to be processed hardens and shapes after the material is cooled down;

[0132] Separating the ribs: The material to be processed after cooling moves forward to the stripping assembly, and the high-elastic component wrapped outside the ribs is pulled out from the surface of the ribs and separated from the ribs, obtaining the material to be processed after the high-elastic component is stripped;

[0133] Secondary pulling: After the high-elastic components are stripped, the material to be processed moves forward through the second crawler traction machine and reaches the cutting assembly.

[0134] Cutting and storing: the material to be processed after the high-elastic component is stripped off is cut and stored according to the required length to obtain the processed material.

[0135] For two situations:

[0136] The isolation tape is a thin strip structure, which is wound layer by layer onto the surface of the prepreg tape. On the one hand, it enables the prepreg tape to be pre-fixed, and on the other hand, it isolates the prepreg tape from the high-elastic component, which is convenient for subsequent demoulding and separation. The thin tape used for the isolation layer can be selected from raw tape and rubber tape. After the composite material reinforcement is formed, the wound and fixed isolation layer can be retained or removed. Generally, the isolation tape needs to be removed before the reinforcement is used.

[0137] The first crawler tractor has three functions. The first is to pull the material to be processed so that it moves forward at a certain speed. The second is to form a pre-tightening force with the second crawler tractor to ensure that the prepreg tape bundle between the two maintains a certain tension during the heating and melting molding process. The third is to pre-fix the circumferential direction of the material to be processed after being wrapped with the isolation tape to prevent the circumferential twisting of the material to be processed.

[0138] The second crawler tractor has three functions. The first is to pull the material to be processed so that it moves forward at a certain speed. The second is to form a preload with the first crawler tractor to ensure that the material between the two maintains a certain tension during the heating, melting and molding process. The third is to fix the circumferential direction of the material to be processed after stripping the high-elastic component to prevent the material to be processed from torsion in the circumferential direction after stripping the high-elastic component.

[0139] The first annular positioner and the second annular positioner have the same structure and the same material, and are tubes or cylinders made of polytetrafluoroethylene.

[0140] The first annular locator supports the material to be processed after being tightly wrapped with the high-elastic component, and the second annular locator is used to invert the loose and twisted material between the first annular locator and the second annular locator due to the peeling of the high-elastic component. In addition, the first annular locator and the second annular locator can prevent the eccentric shaking of the material to be processed.

[0141] Relevant experiments were conducted for Case 1 and Case 2 respectively, and the research results show that: the diameter of the composite bar that has not been twisted is about 10.10mm, and the fiber volume fraction is about 50%; the diameter of the composite bar after twisting is reduced to about 9.20mm, the cross-sectional area of ​​the composite bar is reduced by about 17%, and the fiber volume fraction is increased to about 60%. Figure 3 is a typical displacement load curve of the short beam shear strength (ASTM D4476) test of thermoplastic composite bars before and after twisting. The maximum failure load of the composite bar without twisting is 2280N, and the maximum failure load of the composite bar after twisting is increased to 2740N, an increase of 20%. Taking into account the effect of diameter reduction on the short beam shear strength, the short beam shear strength is increased by as much as 35%. Figure 4 It is a bar chart comparing the short beam shear strength test results of thermoplastic composite reinforcement without twisting and twisting. Figure 5Thermoplastic composite reinforcement before (A) and after (B) twisting. It can be seen from the figure that after twisting, the composite reinforcement has very regular and high ribs on the surface. The appearance of this structure is very beneficial to improve the anchoring strength of the composite reinforcement and the matrix material such as concrete.

[0142] The present invention proposes a stretching and twisting forming technical method based on the basic principles of bionics, and refers to the action of snakes in nature to wrap and twist their prey when catching their prey. In the preparation process of thermoplastic composite reinforcement, a high-elastic material is stretched and then a pre-tightening force is applied to the material so that the material is wrapped around the surface of the thermoplastic composite reinforcement. When the reinforcement is heated and molten, the high-elastic material elastically shrinks and applies a twisting force to the reinforcement. The technical creativity is strong and has great novelty.

[0143] The method for preparing thermoplastic composite reinforcement by stretching and forming proposed in the present invention is significantly effective in reducing the porosity of the reinforcement, increasing the density, improving the impregnation of the thermoplastic resin into the fiber, and increasing the volume fraction of the fiber inside the reinforcement.

[0144] The present invention can be used to directly mold prepreg tapes to prepare thermoplastic composite material bars, and can also improve the performance of formed composite material bars. Both technical routes can obtain thermoplastic composite material bars with excellent comprehensive mechanical properties, and the technical feasibility is good.

[0145] The method for preparing thermoplastic composite reinforcement by stretching and forming proposed by the present invention can naturally press out ribs on the surface of the composite reinforcement, which is convenient for anchoring and stably connecting the reinforcement with a matrix such as concrete, and has good product availability.

[0146] The stretch forming process proposed in the present invention can realize the manufacture of variable diameter thermoplastic composite material tendons by changing and adjusting parameters such as the number and width of thermoplastic prepreg tapes, which effectively solves the technical problem that pultrusion forming cannot produce variable diameter composite material tendons, and the material has good designability.

[0147] The stranding forming process proposed in the present invention is not limited to the production of straight reinforcement configurations, and can realize the production of various types of bent reinforcements through further modification of the device. The device has good modifiability and strong technical scalability.

[0148] Compared with pultrusion, the stranding molding device used in the present invention does not require mold design and mold modification, thus saving costs related to mold design, modification, maintenance, etc.

[0149] The twisting forming device and method adopted by the present invention are free from the limitation of the mold, so the surface of the thermoplastic composite reinforcement will not produce problems such as wear and fuzzing caused by the friction of the mold.

[0150] In summary, the invention has strong technical creativity, good novelty, good technical feasibility, good product availability, good material designability, good device modifiability, strong technical scalability, and saves mold-related costs and related problems caused by friction between materials and molds. The invention has significant effectiveness in reducing the porosity of reinforcement materials, increasing density, improving the impregnation of thermoplastic resins on fibers, and increasing the volume fraction of fibers inside reinforcement materials.

[0151] The following points need to be explained:

[0152] (1) The drawings of the embodiments of the present invention only involve structures related to the embodiments of the present invention. Other structures may refer to conventional designs.

[0153] (2) For the sake of clarity, in the drawings used to describe the embodiments of the present invention, the thickness of layers or regions is exaggerated or reduced, that is, these drawings are not drawn according to the actual scale. It is understood that when an element such as a layer, film, region or substrate is referred to as being "on" or "under" another element, the element may be "directly" "on" or "under" the other element or there may be intermediate elements.

[0154] (3) In the absence of conflict, the embodiments of the present invention and the features therein may be combined with each other to obtain new embodiments.

[0155] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. The protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A thermoplastic composite material tendon drawing and forming processing system, characterized in that: include: A first gear assembly, a second gear assembly, a third gear assembly and a cutting assembly are arranged in sequence according to the traveling direction of the material to be processed, a first crawler traction machine is arranged between the first gear assembly and the second gear assembly, a water cooling assembly is arranged between the second gear assembly and the third gear assembly, and a second crawler traction machine is arranged between the third gear assembly and the cutting assembly; An isolation winding assembly is arranged on the first gear assembly, a high-elastic component assembly is arranged on the second gear assembly, a stripping assembly is arranged on the third gear assembly, and a heating device is arranged between the high-elastic component assembly and the water cooling assembly.

2. The thermoplastic composite material tendon drawing and twisting molding processing system according to claim 2 is characterized in that: The first gear assembly, the second gear assembly and the third gear assembly have the same structure: The first gear assembly includes: a gear motor, a driving wheel and a driven wheel; the gear motor drives the driven wheel to rotate through the driving wheel, a through hole is provided at the center of the driven wheel, and the material to be processed is supported to pass through the through hole; The material to be processed passes through the central axis of the driven wheel of the first gear assembly, the central axis of the driven wheel of the second gear assembly, and the central axis of the driven wheel of the third gear assembly in sequence; The isolation winding assembly comprises: an isolation tape, an adapter and a winding roller; The winding roller is mounted on the side wall of the driven wheel of the first gear assembly through the adapter; The isolation belt is arranged on the winding roller. When the driven wheel of the first gear assembly rotates, the first crawler traction machine moves the material to be processed, and the first isolation belt spirally winds the material to be processed.

3. The thermoplastic composite material tendon drawing and twisting molding processing system according to claim 2, characterized in that: The high-elastic component assembly comprises: a high-elastic component, a first receiving roller, a first annular positioner and a first rotating motor; The fixed end of the first rotating motor is mounted on the end surface of the driven wheel of the second gear assembly away from the third gear assembly; The first receiving roller is connected to the output end of the first rotating motor, and the high elastic component is wound and installed on the first receiving roller; The material to be processed after being wound around the high-elastic component passes through the first annular positioner, and the first annular positioner is used to fasten the material to be processed after being wound around the high-elastic component.

4. The thermoplastic composite material tendon drawing and twisting molding processing system according to claim 3, characterized in that: The heating device is installed on the central axis of the driven wheel of the second gear assembly and passes through the center of the driven shaft of the second gear assembly. The material to be processed, which is fastened by the first annular positioner, is sent into the cavity of the first heating device for electric heating.

5. The thermoplastic composite material tendon drawing and twisting molding processing system according to claim 4, characterized in that: The water cooling component sprays water on the processed materials passing through the heating device through a nozzle.

6. The thermoplastic composite material tendon drawing and twisting forming processing system according to claim 5, characterized in that: The stripping assembly includes: a second receiving roller, a second annular positioner, and a second rotating motor; The fixed end of the second rotating motor is mounted on the end surface of the driven wheel of the third gear assembly close to the second gear assembly; The second receiving roller is mounted at the output end of the second rotating motor; The material to be processed sprayed by the water cooling component passes through the second annular positioner, and then the high-elastic component wound on the material to be processed is recovered and wound by the second receiving roller; The second annular positioner is used to prevent the high-elastic component wound on the material to be processed from loosening before recovery; The second crawler traction machine is used to drive the material to be processed to move in the moving direction.

7. The thermoplastic composite material tendon drawing and twisting forming processing system according to claim 6, characterized in that: The cutting assembly comprises: a moving unit, a third rotating motor and a cutting saw blade; The fixed end of the third rotating motor is mounted on the moving unit, and the cutting saw blade is mounted on the output end of the third rotating motor; The moving unit supports and drives the third rotating motor to move back and forth along the straight line of the material to be processed.

8. The thermoplastic composite material tendon drawing and twisting molding processing system according to claim 6, characterized in that: It also includes a wire guide assembly, which includes: a creel, a roller, and two wire guide plates; A plurality of rollers are arranged on the yarn frame, a plurality of material belts are installed on the drum, and the material belts on all the rollers are supported to pass through two wire guide plates in sequence.

9. The thermoplastic composite material tendon drawing and twisting molding processing system according to claim 6, characterized in that: The cross-sectional shape of the high-elastic component is circular, rectangular, elliptical or polygonal, and the material of the high-elastic component is metal hinge, metal tension spring, high-temperature resistant silicone rubber, fluorosilicone rubber, fluororubber, hydrogenated nitrile rubber, butyl rubber or acrylate rubber; The material to be processed is a thermoplastic composite material rib; The resin in the thermoplastic composite material rib is polypropylene, polyethylene, high-density polyethylene, nylon, polyetheretherketone, polyimide, polyvinyl fluoride, polystyrene, polycarbonate, polyoxymethylene, polyether, polyetherimide or polyphenylene sulfide; The fibers in the thermoplastic composite reinforcement are glass fibers, basalt fibers, aramid fibers, carbon fibers, liquid crystal fibers, polypropylene fibers, polyamide fibers, polyester fibers, polyimide fibers, polyphenylene sulfide fibers, polyarylate fibers or poly(p-phenylene benzobisazole) fibers.

10. A thermoplastic composite material tendon drawing and forming method, characterized in that: The thermoplastic composite material tendon drawing and forming processing system applied to any one of claims 1 to 9 comprises: When the material to be processed is an unformed thermoplastic composite material bar, the guide wire assembly is installed at the head end of the thermoplastic composite material bar drawing and forming processing system: S1, the guide wire assembly combines multiple material strips into the material to be processed; S2, the first crawler tractor and the second crawler tractor simultaneously pull the material to be processed in the moving direction; S3, the driven wheel of the first gear assembly rotates so that the isolation belt is spirally wound around the material to be processed passing through the first gear assembly; S4, when the material to be processed after being wound with the isolation belt enters the position of the corresponding high-elastic component assembly, the driven wheel of the second gear assembly rotates to drive the high-elastic component to spirally wind around the current material to be processed, and at the same time, the first rotating motor drives the first receiving roller to rotate so that the first receiving roller releases the high-elastic component; S5, when the material to be processed after being wound with the high-elastic component moves into the heating device, it is electrically heated; S6. The electrically heated material to be processed is sent to the bottom of the water cooling component to be sprayed for cooling; S7, after the cooled material to be processed passes through the second annular positioner, the second receiving roller peeled off by the peeling assembly recovers the high elastic component wound on the material to be processed; S8, the material to be processed after the high-elastic component is stripped is cut by a cutting assembly; When the material to be processed is a molded thermoplastic composite material bar, the molded thermoplastic composite material bar is directly used as the material to be processed to implement the above steps S2 to S8.

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