Method for manufacturing an ultra-thin and high-strength carbon fiber rod and manufacturing production line

Abstract

The present invention relates to a manufacturing method and a manufacturing production line for an ultra-thin high-strength carbon fiber rod. The manufacturing method includes the following steps: S1. Preparation, S2. Glue coating treatment, S3. Pre-demolding treatment, S4. Strand separation treatment, S5. Winding treatment, S6. Impregnation treatment, S7. Rolling and composite treatment, S8. Curing treatment, S9. Cooling and cutting treatment. The manufacturing production line includes a multi-functional integrated machine, a high-pressure displacement device, a high-pressure rolling device, a curing device, and a cooling and cutting device arranged in sequence, and also includes a conveying device for connecting the integrated machine with each device; the present invention can reduce the thickness of the carbon fiber rod while enabling the carbon fiber rod to have a high strength, and the strength distribution of the carbon fiber rod is uniform everywhere, and it has good roundness and surface roughness, and can improve a certain characteristic of the carbon fiber rod according to requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon fiber rod manufacturing, and particularly to a manufacturing method and production line for an ultra-thin and high-strength carbon fiber rod. Background Art

[0002] Currently, in the manufacturing process of carbon fiber rods, the carbon fiber layers are usually arranged by wrapping multiple layers of carbon fiber cloth, which increases the thickness of the carbon fiber rod, but the strength does not reach the expected level.

[0003] A flat winding method for carbon fiber and a carbon fiber rod processing technology based on this method provided by the Chinese invention patent with the publication number CN107379579B form a raw material wire layer by winding carbon fiber filaments through the flat winding method, and then form a carbon fiber rod through processes such as coating with polyacrylamide, film covering vacuum treatment, high-pressure rolling fusion treatment, and high-temperature curing treatment. Although this method reduces the thickness of the carbon fiber rod and correspondingly improves the strength level.

[0004] However, there are still some defects in the above processing technology.

[0005] (1) Because a large number of nodes are formed during winding, the strength distribution of the carbon fiber rod is uneven. The strength at the nodes is relatively high, while the strength is relatively weak where there are no nodes, resulting in the carbon fiber rod breaking at the connection between two adjacent nodes.

[0006] (2) The existence of nodes has a certain impact on the roundness and surface roughness of the carbon fiber rod. If the roundness and surface roughness of the carbon fiber rod are to be improved, the thickness of the polyacrylamide layer needs to be increased accordingly, which undoubtedly has an adverse effect on reducing the thickness of the carbon fiber rod.

[0007] (3) This process adjusts the winding density of carbon fiber filaments to correspondingly improve the elasticity and strength of the carbon fiber rod, but it cannot specifically improve only the elasticity or only the strength of the carbon fiber rod, with relatively large limitations.

[0008] Therefore, the present invention proposes a manufacturing method and production line for an ultra-thin and high-strength carbon fiber rod to solve the above problems. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to provide a manufacturing method and production line for an ultra-thin and high-strength carbon fiber rod, which can reduce the thickness of the carbon fiber rod while enabling the carbon fiber rod to have high strength, and the strength distribution of the carbon fiber rod is uniform everywhere, and it has good roundness and surface roughness, and can improve a certain characteristic of the carbon fiber rod according to requirements.

[0010] To solve the above technical problems, the technical solution of the present invention is: a manufacturing method of an ultra-thin and high-strength carbon fiber rod, and its innovation lies in: the manufacturing method includes the following steps:

[0011] S1. Preparation: According to the performance requirements of the carbon fiber rod, determine the ply angle θ requirements of each ply of the carbon fiber rod, prepare a carbon fiber filament coil, and the ply angle θ is the angle formed by the carbon fiber filament and the central axis of the carbon fiber rod, -90° < θ < 90°;

[0012] S2. Glue application treatment: Unwind the carbon fiber filament coil to obtain carbon fiber filaments, spray glue on the carbon fiber filaments to make the glue adhere to the carbon fiber filaments, and obtain glue-coated carbon fiber filaments;

[0013] S3: Pre-demolding treatment: Select a model rod of the corresponding specification, and sleeve an inner release paper on the outer surface of the model rod to obtain an easily demoldable model rod;

[0014] S4. Strand separation treatment: Divide the glue-coated carbon fiber filaments into several strands, and evenly wind them around the periphery of the easily demoldable model rod so that the central axis of the glue-coated carbon fiber filaments is parallel to the central axis of the easily demoldable model rod, and obtain glue-coated carbon fiber filaments divided into several strands;

[0015] S5. Winding treatment: According to the θ requirements of each ply of the carbon fiber rod, wind the glue-coated carbon fiber filaments divided into several strands layer by layer from the inside to the outside at the corresponding angles around the easily demoldable model rod to form a carbon fiber mesh cylinder with a multi-layer structure;

[0016] S6. Impregnation treatment: Use a high-pressure displacement device to displace the glue under high pressure so that the glue gradually penetrates into the carbon fiber mesh cylinder and is evenly distributed inside the carbon fiber mesh cylinder to obtain an impregnated carbon fiber mesh cylinder;

[0017] S7. Rolling and compounding treatment: Use a high-pressure rolling device to roll the impregnated carbon fiber mesh cylinder to make the glue compound with the carbon fiber mesh cylinder to obtain a dense carbon fiber mesh cylinder;

[0018] S8. Curing treatment: Perform heat curing treatment on the dense carbon fiber mesh cylinder to obtain a semi-finished carbon fiber rod;

[0019] S9. Cooling and cutting treatment: Cool the semi-finished carbon fiber rod and then demold it, and perform cutting to obtain a finished carbon fiber rod.

[0020] Further, the ambient temperature in steps S2 to S6 is 60 - 80°C.

[0021] Further, the curing temperature in step S8 is 120 - 140°C, and the curing time is 30 - 60 min.

[0022] Further, the impregnation treatment in step S6 includes the following steps:

[0023] Step 1: Move the carbon fiber mesh cylinder into the displacement chamber inside the high-pressure displacement device. There are a glue inlet and a glue outlet on both sides of the displacement chamber of the high-pressure displacement device.

[0024] Step 2: Open the glue inlet and the glue outlet. The high-pressure displacement device displaces the glue. The glue enters the displacement chamber through the glue inlet and flows along the axial direction of the carbon fiber mesh cylinder inside the carbon fiber mesh cylinder. The displacement pressure is 0 - 5 MPa until the glue flow rates at the glue inlet and the glue outlet are the same.

[0025] Step 3: Use a flow valve to reduce the flow rate at the glue outlet, and displace the glue under pressure. The increased value of the displacement pressure is 1 - 6 MPa, and the displacement time is 20 - 40 min to complete the dipping treatment and obtain a dipped carbon fiber mesh cylinder.

[0026] Furthermore, the rolling and compounding treatment in step S7 includes the following steps:

[0027] Step a: Move the dipped carbon fiber mesh cylinder into the high-pressure rolling device.

[0028] Step b: Attach a layer of glue to the outer surface of the dipped carbon fiber mesh cylinder. The temperature of the glue is 60 - 80 °C to obtain a carbon fiber mesh cylinder with completed glue replenishment.

[0029] Step c: Conduct preliminary rolling on the carbon fiber mesh cylinder with completed glue replenishment. The preliminary rolling pressure is 8 - 15 MPa, the preliminary rolling temperature is 80 - 120 °C, and the preliminary rolling time is 30 - 60 min.

[0030] Step d: Repeat steps b and c 1 - 3 times to obtain a semi-dense carbon fiber mesh cylinder.

[0031] Step e: Conduct final rolling on the semi-dense carbon fiber mesh cylinder in the rolling area. The final rolling pressure is 8 - 15 MPa, the final rolling temperature is 80 - 120 °C, and the final rolling time is 60 - 120 min to complete the rolling and compounding treatment and obtain a dense carbon fiber mesh cylinder.

[0032] A production line for manufacturing a carbon fiber rod using the manufacturing method of the above ultra-thin high-strength carbon fiber rod. The production line includes a multi-functional integrated machine, a high-pressure displacement device, a high-pressure rolling device, a curing device, and a cooling and cutting device arranged in sequence. The production line also includes a conveying device for connecting the integrated machine with each device.

[0033] Furthermore, the multi-functional integrated machine includes a rotating cylinder with a horizontal central axis. The rotating cylinder is driven by a rotating drive mechanism to rotate around the central axis of the rotating cylinder. Along the central axis direction on the rotating cylinder, there are a unwinding area, a glue coating area, a strand splitting area, a wire cutting area, and a winding area in sequence.

[0034] The unwinding area is provided with a plurality of unwinding rollers for unwinding carbon fiber silk coils. The plurality of unwinding rollers are evenly distributed along the circumferential direction of the rotating cylinder and rotate around the central axis of the rotating cylinder with the rotating cylinder. The central axis of the unwinding roller is perpendicular to the central axis of the rotating cylinder;

[0035] The gluing area is provided with a wire collecting and guiding device, a gluing device and a first glue tank. The wire collecting and guiding device is used to converge the carbon fiber silk obtained by unwinding through each unwinding roller to one place and guide it into the wire splitting area. The wire collecting and guiding device is coaxially installed in the rotating cylinder and rotates around the central axis of the rotating cylinder with the rotating cylinder. The gluing device is fixed on one side of the rotating cylinder and sprays glue on the converging place of the carbon fiber silk. The first glue tank is arranged on one side of the rotating cylinder and is communicated with the gluing device through a glue pump;

[0036] The wire splitting area is provided with a plurality of rows of wire splitting and guiding roller assemblies corresponding one by one to the unwinding rollers. The plurality of wire splitting and guiding roller assemblies are evenly distributed along the circumferential direction of the rotating cylinder and rotate around the central axis of the rotating cylinder with the rotating cylinder;

[0037] The wire cutting area is provided with a wire cutter and a wire end fixing device for cutting the glued carbon fiber silk divided into several strands. The wire cutter and the wire end fixing device are both installed on the rotating cylinder and rotate around the central axis of the rotating cylinder with the rotating cylinder;

[0038] The winding area is provided with a winding device, a wire pressing device and a clamping rod device. The winding device is used to wind the glued carbon fiber silk divided into several strands around the model rod. The winding device is coaxially installed on the end face of the rotating cylinder and rotates around the central axis of the rotating cylinder with the rotating cylinder. The wire pressing device is fixedly installed on the side of the winding device away from the rotating cylinder and is used to fit the glued carbon fiber silk on the surface of the model rod. Through holes for the model rod to pass through and move linearly back and forth are opened on both the winding device and the wire pressing device. The through holes are coaxially arranged with the rotating cylinder. The clamping rod device is arranged on the side of the wire pressing device away from the winding device and is used to clamp the model rod and the carbon fiber silk wound on the model rod. One side of the model rod is arranged in the through hole, and the other side is clamped by the clamping rod device. The clamping rod device is driven by a linear driving mechanism to move linearly back and forth and drives the model rod to move linearly back and forth in the through hole.

[0039] Further, the high-pressure displacement device includes a high-pressure cylinder, a high-pressure displacement pump and a second glue tank. The high-pressure cylinder is provided with a sealed cylinder cover. An installation rod extending into the model rod is arranged inside the high-pressure cylinder. The model rod is sleeved on the installation rod and cooperates with the inner wall of the high-pressure cylinder to form a displacement annular cavity. A glue inlet and a glue outlet are arranged on both sides of the displacement annular cavity. The glue inlet is communicated with the liquid outlet of the high-pressure displacement pump, and the liquid inlet of the high-pressure displacement pump is communicated with the second glue tank.

[0040] Further, it is characterized in that: the high-pressure rolling device includes a box body, and a glue replenishing area and a rolling area are arranged inside the box body;

[0041] The glue filling area includes a third glue groove and a rubber roller, and the rubber roller is rotatably installed above the third glue groove;

[0042] The rolling area includes a rolling table, on which an outer release paper is laid, and above the rolling table are two coaxially arranged pressure rollers, the central axis of the pressure rollers is parallel to the central axis of the rubber rollers, the two sides of the model rod are respectively sleeved on the two pressure rollers, and rotate with the rotation of the pressure rollers, the pressure rollers are installed on the box body through a rotating frame, and the rotating frame is movably installed on the box body through a slider, and the box body is provided with a guide rail connecting the rolling area and the glue filling area matching the slider, the slider is arranged on the guide rail, and the rotating frame is rotatably installed on the slider;

[0043] The rotating frame is driven to rotate by the first linear drive, and drives the model rod sleeved on the pressing roller to move upward or downward through the pressing roller. The slider is driven to move along the guide rail by the second linear drive, and drives the model rod sleeved on the pressing roller to move linearly back and forth in the rolling area, the glue filling area, and between the rolling area and the glue filling area through the rotating frame and the pressing roller.

[0044] The advantages of the present invention are: carbon fiber wires are directly used in a multi-layer winding manner to form a carbon fiber mesh tube, and at the same time, advance glue coating is used to improve the wettability of the carbon fiber wires to the glue solution, high-pressure driving is used to dip the glue into the carbon fiber mesh tube, and high-pressure rolling is used to compound the carbon fiber mesh tube with the glue solution. The composite effect of the carbon fiber mesh tube and the glue solution is guaranteed. The carbon fiber rod manufactured by the manufacturing method of the present invention is thin in thickness, high in strength, and has uniform strength distribution everywhere. At the same time, it has good roundness and surface roughness. According to needs, a certain characteristic of the carbon fiber rod can be improved by changing the ply angles of each ply and increasing or decreasing the corresponding number of plies. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0046] Figure 1 It is a schematic diagram of a production line for producing ultra-thin high-strength carbon fiber rods in the present invention.

[0047] Figure 2 It is a schematic diagram of the structure of the multifunctional all-in-one machine in the present invention.

[0048] Figure 3 It is a schematic diagram of the structure of the wire collection guide in the present invention.

[0049] Figure 4 It is a partial cross-sectional view of the thread cutting area in the present invention.

[0050] Figure 5 It is a schematic diagram of the structure of the wire winder in the present invention.

[0051] Figure 6 This is a sectional view of the high-pressure cylinder in the present invention.

[0052] Figure 7 This is a schematic structural diagram of the high-pressure rolling equipment in the present invention.

[0053] Figure 8 This is a schematic connection diagram of the pressure roller and the rotating frame in the present invention. Detailed implementation manners

[0054] The following embodiments can enable those skilled in the art to understand the present invention more comprehensively, but do not limit the present invention within the scope of the described embodiments.

[0055] A manufacturing method of an ultra-thin high-strength carbon fiber rod provided by the present invention includes the following steps:

[0056] S1. Preparation: According to the performance requirements of the carbon fiber rod, determine the requirements for the laying angle θ of each layer of the carbon fiber rod, and prepare a carbon fiber filament coil. The laying angle θ is the angle formed by the carbon fiber filament and the central axis of the carbon fiber rod;

[0057] S2. Glue coating treatment: Unwind the carbon fiber filament coil to obtain carbon fiber filaments, spray glue on the carbon fiber filaments to make the glue adhere to the carbon fiber filaments, and obtain glue-coated carbon fiber filaments;

[0058] S3: Pre-demolding treatment: Select a model rod with corresponding specifications, and sleeve a layer of inner release paper on the outer surface of the model rod to obtain an easily demolded model rod;

[0059] S4. Strand separation treatment: Divide the glue-coated carbon fiber filaments into several strands and evenly surround the periphery of the easily demolded model rod so that the central axis of the glue-coated carbon fiber filaments is parallel to the central axis of the easily demolded model rod, and obtain glue-coated carbon fiber filaments divided into several strands;

[0060] S5. Winding treatment: According to the θ requirements of each layer of the carbon fiber rod, wind the glue-coated carbon fiber filaments divided into several strands layer by layer from the inside to the outside at corresponding angles on the easily demolded model rod to form a carbon fiber mesh cylinder with a multi-layer structure;

[0061] S6. Glue impregnation treatment: Use a high-pressure displacement device to displace the glue under high pressure so that the glue gradually penetrates into the carbon fiber mesh cylinder and is evenly distributed in the carbon fiber mesh cylinder to obtain an impregnated carbon fiber mesh cylinder;

[0062] S7. Rolling and compounding treatment: Use a high-pressure rolling device to roll the impregnated carbon fiber mesh cylinder to make the glue and the carbon fiber mesh cylinder compound to obtain a dense carbon fiber mesh cylinder;

[0063] S8. Curing treatment: Perform heat curing treatment on the dense carbon fiber mesh cylinder to obtain a semi-finished carbon fiber rod;

[0064] S9: Cooling and cutting process: Cool the semi-finished carbon fiber rod to below 60°C and then demold it, and perform cutting to obtain the finished carbon fiber rod.

[0065] Among them, in step S1, -90° < θ < 90°. When higher requirements are imposed on the flexibility of the carbon fiber rod, usually the method of increasing the ply with θ = 90° or -90° is adopted, that is, the carbon fiber filaments are perpendicular to the central axis of the carbon fiber rod. Since the carbon fiber filaments are wound around the model rod, it is impossible to achieve a state where the direction of the carbon fiber filaments is exactly perpendicular to the central axis of the carbon fiber rod. Therefore, to make up for this defect, only one strand of carbon fiber filaments can be tightly wound around the model rod, so as to achieve a state where the direction of the carbon fiber filaments is approximately perpendicular to the central axis of the carbon fiber rod. At the same time, by adopting the method of selecting carbon fiber filaments with a small diameter and arranging them in multiple layers, the smaller the diameter of the carbon fiber filaments, the closer the direction of the carbon fiber filaments is to the perpendicular state with the central axis of the carbon fiber rod, and the multi-layer arrangement enables the carbon fiber rod to meet the flexibility requirements.

[0066] Among them, the ambient temperature for steps S2 to S6 is 60 - 80°C. Under this ambient temperature condition, the sizing agent attached to the carbon fiber filaments can always be kept in a liquid state, and at the same time has a certain adhesive force, ensuring that the sizing agent adheres to the carbon fiber filaments and achieving good bonding between the carbon fiber filaments of each ply.

[0067] Among them, the curing temperature for step S8 is 120 - 140°C, and the curing time is 30 - 60 min.

[0068] Among them, the impregnation treatment in step S6 includes the following steps:

[0069] Step 1: Move the carbon fiber mesh cylinder into the displacement chamber of the high-pressure displacement device. The two sides of the displacement chamber of the high-pressure displacement device are provided with a sizing agent inlet and a sizing agent outlet.

[0070] Step 2: Open the sizing agent inlet and the sizing agent outlet. The high-pressure displacement device displaces the sizing agent to enter the displacement chamber through the sizing agent inlet, and the sizing agent flows along the axial direction of the carbon fiber mesh cylinder in the carbon fiber mesh cylinder. The displacement pressure is 0 - 5 MPa until the sizing agent flow rates at the sizing agent inlet and the sizing agent outlet are the same.

[0071] Step 3: Use a flow valve to reduce the flow rate of the sizing agent outlet, displace the sizing agent, increase the displacement pressure by 1 - 6 MPa, and displace for 20 - 40 min to complete the impregnation treatment and obtain the impregnated carbon fiber mesh cylinder.

[0072] Among them, the rolling and compounding treatment in step S7 includes the following steps:

[0073] Step a: Move the impregnated carbon fiber mesh cylinder into the high-pressure rolling device.

[0074] Step b: Attach a layer of glue solution to the outer surface of the impregnated carbon fiber mesh cylinder at a temperature of 60 - 80 °C to obtain a carbon fiber mesh cylinder with completed glue replenishment.

[0075] Step c: Conduct preliminary rolling on the carbon fiber mesh cylinder with completed glue replenishment, with a preliminary rolling pressure of 8 - 15 MPa, a preliminary rolling temperature of 80 - 120 °C, and a preliminary rolling time of 30 - 60 min.

[0076] Step d: Repeat steps b and c 1 - 3 times to obtain a semi - dense carbon fiber mesh cylinder.

[0077] Step e: Conduct final rolling on the semi - dense carbon fiber mesh cylinder in the rolling area, with a final rolling pressure of 8 - 15 MPa, a final rolling temperature of 80 - 120 °C, and a final rolling time of 60 - 120 min to complete the rolling composite treatment and obtain a dense carbon fiber mesh cylinder.

[0078] The manufacturing method of the present invention directly forms a carbon fiber mesh cylinder by using carbon fiber filaments in a multi - layer winding manner. At the same time, it combines the methods of pre - coating glue to improve the wettability of carbon fiber filaments to the glue solution, high - pressure displacement to impregnate glue into the carbon fiber mesh cylinder, and high - pressure rolling to compound the carbon fiber mesh cylinder with the glue solution, ensuring the compounding effect of the carbon fiber mesh cylinder and the glue solution. The carbon fiber rod manufactured by the manufacturing method of the present invention has a thin thickness, high strength, and uniform strength distribution everywhere. At the same time, it has good roundness and surface roughness, and can improve a certain characteristic of the carbon fiber rod by changing the laying angle of each ply and increasing or decreasing the corresponding ply number according to requirements.

[0079] As Figure 1-8 shown, the manufacturing production line for manufacturing an ultra - thin and high - strength carbon fiber rod using the above - mentioned manufacturing method of the present invention includes a multi - functional integrated machine 1, a high - pressure displacement device 2, a high - pressure rolling device 3, a curing device 4, and a cooling and cutting device 5 arranged in sequence. The manufacturing production line also includes a conveying device for connecting the integrated machine with each device.

[0080] The multi - functional integrated machine 1 includes a rotating cylinder 11 with a horizontal central axis. The rotating cylinder 11 is driven by a rotating drive mechanism 12 to rotate around the central axis of the rotating cylinder 11. The rotating drive mechanism 12 is a first rotating motor. Along the central axis direction on the rotating cylinder 11, there are a unwinding area 13, a glue - coating area 14, a strand - splitting area 15, a wire - cutting area 16, and a winding area 17 in sequence.

[0081] The unwinding area 13 is provided with a number of unwinding rollers 131 for unwinding carbon fiber filament reels. The unwinding rollers 131 are rotatably installed on the rotating cylinder 11. The number of unwinding rollers 131 is evenly distributed along the circumferential direction of the rotating cylinder 11 and rotates with the rotating cylinder 11 around the central axis of the rotating cylinder 11. The central axis of the unwinding roller 13 is perpendicular to the central axis of the rotating cylinder 11. The carbon fiber filaments unwound from the carbon fiber filament reels through the unwinding rollers 131 enter the inside of the rotating cylinder 11 and then enter the glue - coating area 14.

[0082] The glue application area 14 is provided with a wire gathering and guiding device 141, a glue applicator 142 and a first glue tank 143. The wire gathering and guiding device 141 is used to gather the carbon fiber filaments obtained by unwinding from each unwinding roller 131 to one place and guide them into the wire splitting area 15. The wire gathering and guiding device 141 is coaxially installed inside the rotating cylinder 11 through a mounting frame and rotates around the central axis of the rotating cylinder 11 along with the rotating cylinder 11. The wire gathering and guiding device 141 includes a wire gathering plate 1411. A number of wire passing holes 1412 for each carbon fiber filament are formed in the middle of the wire gathering plate 1411. On both sides of each wire passing hole 1412 on the wire gathering plate 1411, wire gathering and guiding wheels 1413 are installed. Through the mutual cooperation of the wire gathering and guiding wheels 1413 and the wire passing holes 1412, the carbon fiber filaments are concentrated in the middle of the wire gathering plate 1411. Openings through which the glue liquid passes are formed around the wire gathering and guiding wheels 1413 of the rotating cylinder 11. The glue applicator 142 is fixed on one side of the rotating cylinder 11 and sprays glue liquid towards the converging place of the carbon fiber filaments through the openings. The first glue tank 143 is arranged below the rotating cylinder 11 and is communicated with the glue applicator 142 through a glue liquid pump 144. The carbon fiber filaments concentrated in the middle of the wire gathering plate 1411 pass through the corresponding wire passing holes 1412 after being coated with glue and enter the wire splitting area 15, and the excess glue liquid falls into the first glue tank 143 from the openings.

[0083] The wire splitting area 15 is provided with several rows of wire splitting and guiding roller assemblies 151 corresponding one by one to the unwinding rollers 131. The several wire splitting and guiding roller assemblies 151 are evenly distributed along the circumferential direction of the rotating cylinder 11 and rotate around the central axis of the rotating cylinder 11 along with the rotating cylinder 11. The wire splitting and guiding roller assemblies 151 are installed on the outside of the rotating cylinder 11. On the side of the wire splitting and guiding roller assemblies 151 on the rotating cylinder 11 close to the wire gathering and guiding device 141, lead-out holes 152 for the carbon fiber filaments to pass through from the inside of the rotating cylinder to the outside of the rotating cylinder are formed. Each wire splitting and guiding roller assembly 151 includes several wire splitting and guiding rollers evenly distributed along the axial direction of the rotating cylinder 11. The carbon fiber filaments are guided by the wire splitting and guiding rollers into the wire cutting area 16.

[0084] The wire cutting area 16 is provided with a wire cutter 162 and a wire end fixator 163 for cutting the glue-coated carbon fiber silk thread divided into several strands. Both the wire cutter 162 and the wire end fixator 163 are installed on the rotating cylinder 11 and rotate around the central axis of the rotating cylinder 11 with the rotating cylinder 11. The wire cutting area 16 is also provided with a wire cutting disc 161. The end of the rotating cylinder 11 close to the wire cutting area 16 is provided with a reduced-diameter cylinder. The wire cutting disc 161 is installed on the side of the reduced-diameter cylinder away from the rotating cylinder 11. A plurality of wire cutting holes 169 for each strand of the glue-coated carbon fiber silk thread to pass through are formed in the circumferential direction on the wire cutting disc 161. A wire cutting guide roller 166 is rotatably installed on one side inside the wire cutting hole 169. The wire cutter 162 and the wire end fixator 163 are arranged on the side of the wire cutting hole 169 away from the wire cutting guide roller 166. The wire cutter 162 includes a cutting knife, and the wire end fixator 163 includes a clamping block. The cutting knife and the clamping block are connected by a connecting plate 165. The clamping block is installed on the connecting plate 165 through a spring 167. Both the cutting knife and the clamping block are installed on the side of the connecting plate 165 close to the wire cutting guide roller 166. The other side of the connecting plate 165 is driven by a first push rod motor 164 to move in the radial direction of the wire cutting disc 161. A knife groove 168 for the tip of the cutting knife to enter is formed inside the wire cutting hole 169. When each ply is wound on the model rod in the winding area 17, the first push rod motor 164 drives the connecting plate 165 to move towards the side close to the wire cutting guide roller 166. The clamping block presses the carbon fiber silk thread against the inner wall of the wire cutting hole 169. Continuing to move the connecting plate 165, the clamping block compresses the spring 167, and the cutting knife continues to move into the knife groove 168 to cut the carbon fiber silk thread. The first push rod motor 164 drives the connecting plate 165 to move away from the wire cutting guide roller 166. The cutting knife moves away from the carbon fiber silk thread along with the connecting plate 165, while the clamping block continues to press the carbon fiber silk thread under the elastic force of the spring 167 until the end of the carbon fiber silk thread is manually dragged and refixed around the model rod. When starting the winding of a new ply, the first push rod motor 164 continues to drive the connecting plate 165 to drive the clamping block away from the carbon fiber silk thread.

[0085] The winding area is provided with a wire winder 171, a wire presser 172 and a rod gripper 173. The wire winder 171 is used to wind the glue-coated carbon fiber silk threads divided into several strands around the model rod 6. The wire winder 171 is coaxially installed on the side of the wire cutting disc 161 away from the diameter-reducing cylinder on the end face of the rotating cylinder, and rotates around the central axis of the rotating cylinder 11 with the rotating cylinder 11. The wire winder 171 is of a conical structure. A wire winding guide wheel 172 is provided in the middle of the side surface of the wire winder 171. A double guide wheel 173 is provided on the side of the wire winder 171 away from the wire cutting disc 161. The carbon fiber silk thread is guided between the double guide wheels 173 after being guided by the winding guide wheel 172. The carbon fiber silk thread can play a good guiding role no matter how it is wound at any angle. The wire presser 172 is fixedly installed on the side of the wire winder 171 away from the rotating cylinder 11, and is used to attach the glue-coated carbon fiber silk thread to the surface of the model rod 6. Through holes for the model rod 6 to pass through and move linearly back and forth are opened on the wire winder 171, the wire presser 172, the wire cutting disc 16 and the diameter-reducing cylinder. The through holes are coaxially arranged with the rotating cylinder 11. The side of the through hole of the wire presser 172 close to the wire winder 171 is a flared opening. The rod gripper 173 is arranged on the side of the wire presser 172 away from the wire winder 171, and is used to clamp the model rod 6 and the carbon fiber silk thread wound on the model rod 6. One side of the model rod 6 is arranged in the through hole, and the other side is clamped by the rod gripper 173. The rod gripper 173 is provided with two oppositely arranged clamping plates. The two clamping plates are cooperatively provided with a clamping groove for the model rod 6. An elastic layer is arranged in the clamping groove so as to effectively clamp the model rod 6 as the number of layers on each model rod increases. The two clamping plates are respectively pushed by a push rod motor to move closer to or away from each other. The rod gripper 173 is driven by a linear drive mechanism to move linearly back and forth, and drives the model rod 6 to move linearly back and forth in the through hole. The linear drive mechanism is composed of a second rotating motor 174 and a double screw rod 175. The rod gripper 173 is provided with a threaded hole for the double screw rod 175 to pass through. One end of the double screw rod 175 is rotatably installed on the mounting seat, and the other end of the double screw rod 175 passes through the threaded hole and is rotatably installed on the wire presser 172. Four rollers 176 are arranged at the bottom of the rod gripper 173. A rolling guide rail 177 matching the rollers is arranged between the mounting seat and the wire presser 172. The rollers 176 are rotatably installed on the rolling guide rail 177.

[0086] When the multi-functional integrated machine 1 is working, after the carbon fiber silk thread reel unwinds in the unwinding area 13, it successively passes through the gluing area 14, the splitting area 15, the wire cutting area 16 and enters the winding area 17. During the initial winding, the end of the carbon fiber silk thread is guided by the winder 171, passes through the through hole of the wire pressing device 172, and then winds around one end of the model rod 6 far from the rotating cylinder 11 and is clamped by the clamping device 173. The first rotating motor is started to drive the rotating cylinder 11 to rotate, driving the winder 171 to rotate. At the same time, the second rotating motor drives the double screw rod 175 to rotate, driving the clamping device 173 to pull the model rod 6 to move away from the rotating cylinder. During this process, the carbon fiber silk thread winds around the model rod 6 to form the first ply. After the first ply is completed, the rotating cylinder 11 stops rotating, and the carbon fiber silk thread is cut off by the wire cutting area 16. The second rotating motor drives the double screw rod 175 to rotate in the reverse direction, driving the clamping device 173 to push the model rod 6 to move closer to the rotating cylinder. Manually hold the end of the cut carbon fiber silk thread and rewind it around the model rod 6 and clamp it and fix it with the clamping device 173. Repeat the above steps to complete the winding of the next ply until all plies are completed. During the winding process, by controlling the rotation speed of the rotating cylinder and the moving speed of the model rod, the ply angle of each ply and the density of the carbon fiber silk thread are controlled; in addition, the multi-functional integrated machine 1 uses an electric heating method for temperature control.

[0087] The high-pressure displacement device 2 includes a high-pressure cylinder 21, a high-pressure displacement pump 22 and a second glue tank 23. A sealing cylinder cover 211 is provided on the high-pressure cylinder 21. An installation rod 212 extending into the interior of the model rod 6 is provided inside the high-pressure cylinder 21. The model rod 6 is sleeved on the installation rod 212 and cooperates with the inner wall of the high-pressure cylinder 21 to form a displacement annular cavity. A glue inlet 214 and a glue outlet 213 are provided on both sides of the displacement annular cavity. The glue inlet 214 and the glue outlet 213 are respectively arranged on both sides in the axial direction of the displacement annular cavity. Both the glue inlet 214 and the glue outlet 213 cover the carbon fiber mesh cylinder 7 on the model rod 6. The glue inlet 214 is communicated with the liquid outlet of the high-pressure displacement pump 22. The liquid inlet of the high-pressure displacement pump 22 is communicated with the second glue tank 23. The glue outlet 213 is communicated with the second glue tank 23 through a circulation pipe. Flow valves are provided on both the glue outlet 213 and the glue inlet 214. A pressure gauge 24 is also provided at the glue inlet 214. The high-pressure displacement device 2 uses an electric heating method to control the temperature inside the high-pressure cylinder 21 and the second glue tank 23.

[0088] The high-pressure rolling equipment 3 includes a box body 31, and a glue replenishing area and a rolling area are arranged inside the box body 31; the glue replenishing area includes a third glue tank 32 and a glue roller 34, and the glue roller 34 is rotatably installed above the third glue tank 32; the rolling area includes a rolling table 33, an outer release paper 331 is laid on the rolling table 33, the outer release paper 331 is pressed on the upper end surface of the rolling table 33 by a pressing plate 332, an electric heating coil 333 for heating the rolling table 33 is arranged inside the rolling table 33, two coaxially arranged pressing rollers 35 are arranged above the rolling table 33, the central axis of the pressing roller 35 is parallel to the central axis of the glue roller 34, both sides of the model rod are sleeved on the two pressing rollers 35 respectively and rotate with the rotation of the pressing rollers 35, the pressing rollers 35 are installed on the box body 31 through a rotating frame 36, the rotating frame 36 is movably installed on the box body 31 through a slider 37, a guide rail 38 connecting the rolling area and the glue replenishing area and matching with the slider 37 is arranged on the box body 31, the slider 37 is movably arranged on the guide rail 38, and the rotating frame 36 is rotatably installed on the slider 37; the rotating frame 36 is driven by a first linear driver 39 to rotate, and drives the model rod sleeved on the pressing roller 35 to move up or down through the pressing roller 35, the first linear driver 39 is a second push rod motor, both ends of the first linear driver 39 are rotatably installed on the slider 37 and the rotating frame 36 respectively, the slider 37 is driven by a second linear driver 310 to move along the guide rail 38, and drives the model rod sleeved on the pressing roller 35 to perform a linear reciprocating movement between the rolling area, the glue replenishing area and between the rolling area and the glue replenishing area through the rotating frame 36 and the pressing roller 35, and the second linear driver 310 is a third push rod motor.

[0089] When the high-pressure rolling equipment 3 is rolling, the first linear driver 39 drives the rotating frame 36 to rotate downward, places the model rod sleeved on the pressing roller 35 on the upper end surface of the outer release paper 331 of the rolling table 33, and applies a downward rolling pressure to the model rod. The second linear driver 310 drives the slider 37 to reciprocate above the rolling table 33, so that the model rod rolls back and forth on the outer release paper 331. When glue replenishment is required, the first linear driver 39 drives the rotating frame 36 to rotate upward, cancels the downward rolling pressure applied to the model rod, the second linear driver 310 pushes the slider 37 to move above the glue roller 34, the first linear driver 39 drives the rotating frame 36 to rotate downward, so that the model rod is attached to the side surface of the glue roller 34, the glue roller 34 rotates, drives the model rod to rotate along with the pressing roller 35, and after the glue replenishment of the model rod is completed, it moves above the rolling table 33, repeats the above operation, and continues rolling.

[0090] The curing equipment 4, the cooling and cutting equipment 5 and the conveying equipment involved in the present invention are all conventional general-purpose equipment, and will not be elaborated here.

[0091] The following are Products 1-10 manufactured under different conditions, and the performance of Products 1-10 was detected respectively. The manufacturing condition parameters of Products 1-10 are shown in Table 1, and the experimental results of the performance detection of Products 1-10 are shown in Table 2.

[0092]

[0093]

[0094] From the above experimental results of performance detection, it can be seen that by impregnating the carbon fiber mesh cylinder with glue through high-pressure displacement, the glue can enter the inside of the carbon fiber mesh cylinder better, filling the carbon fiber mesh cylinder with glue, which can better improve the performance of the carbon fiber rod. By high-pressure rolling to compound the carbon fiber mesh cylinder with the glue, the compounding between the glue and the carbon fiber mesh cylinder becomes closer, significantly improving the surface roughness and straightness of the carbon fiber rod. By increasing the number of plies with a ply angle of 0° for the carbon fiber rod, the shear strength of the carbon fiber rod can be improved. By increasing the number of plies with a ply angle close to 90° for the carbon fiber rod, the deflection of the carbon fiber rod can be effectively improved.

[0095] Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A manufacturing method of an ultra-thin and high-strength carbon fiber rod, characterized in that: The manufacturing method includes the following steps: S1. Preparation: According to the performance requirements of the carbon fiber rod, determine the ply angle θ requirements for each ply of the carbon fiber rod, prepare a carbon fiber filament coil, where the ply angle θ is the angle formed by the carbon fiber filament and the central axis of the carbon fiber rod, and -90° < θ < 90°; S2. Glue application treatment: Unwind the carbon fiber filament coil to obtain carbon fiber filaments, spray glue solution on the carbon fiber filaments to make the glue solution adhere to the carbon fiber filaments, and obtain glue-coated carbon fiber filaments; S3: Pre-demolding treatment: Select a model rod of corresponding specifications, and sleeve a layer of inner release paper on the outer surface of the model rod to obtain an easily demoldable model rod; S4. Strand separation treatment: Divide the glue-coated carbon fiber filaments into several strands, and evenly surround the periphery of the easily demoldable model rod so that the central axis of the glue-coated carbon fiber filaments is parallel to the central axis of the easily demoldable model rod, and obtain the glue-coated carbon fiber filaments divided into several strands; S5. Winding treatment: According to the θ requirements of each ply of the carbon fiber rod, wind the glue-coated carbon fiber filaments divided into several strands layer by layer from the inside to the outside at corresponding angles on the easily demoldable model rod to form a carbon fiber mesh cylinder with a multi-layer structure; S6. Impregnation treatment: Use a high-pressure displacement device to displace the glue solution under high pressure so that the glue solution gradually penetrates into the carbon fiber mesh cylinder and is evenly distributed in the carbon fiber mesh cylinder to obtain an impregnated carbon fiber mesh cylinder; The impregnation treatment in step S6 includes the following steps: Step 1. Move the carbon fiber mesh cylinder into the displacement chamber in the high-pressure displacement device. The two sides of the displacement chamber of the high-pressure displacement device are provided with a glue solution inlet and a glue solution outlet; Step 2. Open the glue solution inlet and the glue solution outlet. The high-pressure displacement device displaces the glue solution under high pressure to enter the displacement chamber through the glue solution inlet, and flows in the carbon fiber mesh cylinder along the axial direction of the carbon fiber mesh cylinder. The displacement pressure is 0 - 5 MPa until the glue solution flow rates at the glue solution inlet and the glue solution outlet are the same; Step 3. Use a flow valve to reduce the flow rate of the glue solution at the glue solution outlet, displace the glue solution under pressure, the increased value of the displacement pressure is 1 - 6 MPa, and the displacement time is 20 - 40 min to complete the impregnation treatment and obtain an impregnated carbon fiber mesh cylinder; S7: Rolling and compounding treatment: Use a high-pressure rolling device to roll the impregnated carbon fiber mesh cylinder to make the glue solution compound with the carbon fiber mesh cylinder and obtain a dense carbon fiber mesh cylinder; S8: Curing treatment: Perform heat curing treatment on the dense carbon fiber mesh cylinder to obtain a semi-finished carbon fiber rod; S9: Cooling and cutting treatment: Cool and demold the semi-finished carbon fiber rod, and perform cutting to obtain a finished carbon fiber rod.

2. The manufacturing method of the ultra-thin high-strength carbon fiber rod according to claim 1, characterized in that: The ambient temperature for steps S2 to S6 is 60 - 80°C.

3. The manufacturing method of the ultra-thin high-strength carbon fiber rod according to claim 1, characterized in that: The curing temperature in step S8 is 120 - 140°C, and the curing time is 30 - 60 min.

4. The manufacturing method of the ultra-thin high-strength carbon fiber rod according to claim 1, characterized in that: The rolling and compounding treatment in step S7 includes the following steps: Step a. Move the impregnated carbon fiber mesh cylinder into the high-pressure rolling device; Step b. Attach a layer of glue solution on the outer surface of the impregnated carbon fiber mesh cylinder. The temperature of the glue solution is 60 - 80°C to obtain a carbon fiber mesh cylinder with supplementary glue applied; Step c. Perform preliminary rolling on the carbon fiber mesh cylinder with supplementary glue applied. The preliminary rolling pressure is 8 - 15 MPa, the preliminary rolling temperature is 80 - 120°C, and the preliminary rolling time is 30 - 60 min; Step d: Repeat step b and step c for 1 - 3 times to obtain a semi-dense carbon fiber mesh cylinder; Step e: Perform final rolling on the semi-dense carbon fiber mesh cylinder in the rolling area. The final rolling pressure is 8 - 15 MPa, the final rolling temperature is 80 - 120 °C, and the final rolling time is 60 - 120 min to complete the rolling composite treatment and obtain a dense carbon fiber mesh cylinder.

5. A production line for implementing the manufacturing method of the ultra-thin high-strength carbon fiber rod described in claim 1, characterized in that: The production line includes a multi-functional integrated machine, a high-pressure displacement device, a high-pressure rolling device, a curing device, and a cooling and cutting device arranged in sequence. The production line also includes a conveying device for connecting the integrated machine with each device.

6. The production line for implementing the manufacturing method of an ultra-thin and high-strength carbon fiber rod according to claim 5, characterized in that: The multi-functional integrated machine includes a rotating cylinder with a horizontal central axis. The rotating cylinder is driven by a rotation driving mechanism to rotate around the central axis of the rotating cylinder. Along the central axis direction of the rotating cylinder, there are a unwinding area, a gluing area, a splitting area, a wire cutting area, and a winding area in sequence. The unwinding area is provided with several unwinding rollers for unwinding carbon fiber silk coils. The several unwinding rollers are evenly distributed along the circumferential direction of the rotating cylinder and rotate around the central axis of the rotating cylinder with the rotating cylinder. The central axis of the unwinding roller is perpendicular to the central axis of the rotating cylinder. The gluing area is provided with a wire collecting and guiding device, a gluing device, and a first glue tank. The wire collecting and guiding device is used to converge the carbon fiber silk obtained by unwinding from each unwinding roller to one place and guide it into the splitting area. The wire collecting and guiding device is coaxially installed in the rotating cylinder and rotates around the central axis of the rotating cylinder with the rotating cylinder. The gluing device is fixed on one side of the rotating cylinder and sprays glue on the converging place of the carbon fiber silk. The first glue tank is arranged on one side of the rotating cylinder and is connected to the gluing device through a glue pump. The splitting area is provided with several rows of splitting and guiding roller assemblies corresponding to the unwinding rollers one by one. The several splitting and guiding roller assemblies are evenly distributed along the circumferential direction of the rotating cylinder and rotate around the central axis of the rotating cylinder with the rotating cylinder. The wire cutting area is provided with a wire cutter and a wire end fixer for cutting the glued carbon fiber silk divided into several strands. Both the wire cutter and the wire end fixer are installed on the rotating cylinder and rotate around the central axis of the rotating cylinder with the rotating cylinder. The winding area is provided with a winder, a wire pressing device, and a clamping rod device. The winder is used to wind the glued carbon fiber silk divided into several strands around the model rod. The winder is coaxially installed on the end face of the rotating cylinder and rotates around the central axis of the rotating cylinder with the rotating cylinder. The wire pressing device is fixedly installed on the side of the winder away from the rotating cylinder and is used to press the glued carbon fiber silk against the surface of the model rod. Through holes for the model rod to pass through and move linearly back and forth are opened on both the winder and the wire pressing device. The through holes are coaxially arranged with the rotating cylinder. The clamping rod device is arranged on the side of the wire pressing device away from the winder and is used to clamp the model rod and the carbon fiber silk wound on the model rod. One side of the model rod is arranged in the through hole, and the other side is clamped by the clamping rod device. The clamping rod device is driven by a linear driving mechanism to perform linear reciprocating movement and drives the model rod to perform linear reciprocating movement in the through hole.

7. The production line for implementing the manufacturing method of an ultra-thin and high-strength carbon fiber rod according to claim 5, characterized in that: The high-pressure displacement device includes a high-pressure cylinder, a high-pressure displacement pump, and a second glue tank. A sealed cylinder cover is provided on the high-pressure cylinder. An installation rod extending into the interior of the model rod is provided inside the high-pressure cylinder. The model rod is sleeved on the installation rod and cooperates with the inner wall of the high-pressure cylinder to form a displacement annular cavity. A glue inlet and a glue outlet are provided on both sides of the displacement annular cavity. The glue inlet is communicated with the liquid outlet of the high-pressure displacement pump, and the liquid inlet of the high-pressure displacement pump is communicated with the second glue tank.

8. The production line for implementing the manufacturing method of an ultra-thin and high-strength carbon fiber rod according to claim 5, characterized in that: The high-pressure rolling device includes a box body, and a glue replenishing area and a rolling area are provided inside the box body; The glue replenishing area includes a third glue tank and a glue roller, and the glue roller is rotatably installed above the third glue tank; The rolling area includes a rolling table, and an outer release paper is laid on the rolling table. Two coaxially arranged pressing rollers are provided above the rolling table. The central axis of the pressing roller is parallel to the central axis of the glue roller. Both sides of the model rod are respectively sleeved on the two pressing rollers and rotate with the rotation of the pressing rollers. The pressing rollers are installed on the box body through a rotating frame. The rotating frame is movably installed on the box body through a slider. A guide rail connecting the rolling area and the glue replenishing area and matching the slider is provided on the box body. The slider is arranged on the guide rail, and the rotating frame is rotatably installed on the slider; The rotating frame is driven to rotate by a first linear driver, and drives the model rod sleeved on the pressing roller to move up or down through the pressing roller. The slider is driven to move along the guide rail by a second linear driver, and drives the model rod sleeved on the pressing roller through the rotating frame and the pressing roller to perform a linear reciprocating movement between the rolling area, the glue replenishing area, and between the rolling area and the glue replenishing area.

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