A method of elongating carbon fibers

Abstract

This invention relates to a carbon fiber stretching method, belonging to the field of carbon fiber technology, and addresses several problems, including: poor fit between the barrel and barrel shaft leading to tension fluctuations in the carbon fiber bundle; potential detachment of the diameter-changing component from the barrel during yarn feeding; uneven mixing of water mist and high-temperature steam disrupting the stability of the stretching environment; and uneven initial distribution of water mist in the steam flow due to water mist entering the side of the steam pipe from the water mist pipe inlet. The invention comprises the following steps: Step A: Loading; Step B: Preheating; Step C: Yarn threading; Step D: Stretching; Step E: Ending stretching. Utilizing the crossbar of this invention, the axial socket can move axially along the first half-shaft, and the radial top block can extend radially beyond the outer wall of the first half-shaft and connect with the inner wall of the barrel. The radial top block widens the first half-shaft, reducing the gap between the first half-shaft and the barrel, thereby improving the tightness of the fit between the barrel and the barrel shaft.

Description

Technical Field

[0001] This invention relates to the field of carbon fiber technology, and in particular to a method for stretching carbon fibers. Background Technology

[0002] The drawing section of carbon fiber precursor production stretches the fiber at high speed in a high-temperature and high-pressure steam environment, allowing the molecular chains to be highly oriented, thereby improving the strength and modulus of the precursor.

[0003] In the carbon fiber steam drawing process, water mist is added to and mixed with high-temperature steam to increase the ambient temperature and humidity during carbon fiber drawing. Uneven mixing of high-temperature steam and water mist can severely disrupt the stability of the drawing environment, causing multiple adverse effects on the drawing effect and the quality of the precursor fiber. Uneven mixing directly leads to disordered temperature and pressure fields within the drawing chamber, resulting in localized overheating, localized cooling, or humid areas. This causes significant differences in the degree of plasticization of the fiber bundles, uneven stress during drawing, and problems such as monofilament breakage and increased fuzziness, seriously affecting continuous production efficiency.

[0004] When the filament roll is inserted into the barrel shaft, the outer surfaces of the barrel and the barrel shaft are not firmly attached, which can easily cause the filament roll to shift, thereby causing tension fluctuations and deviations in the running trajectory of the carbon fiber bundle, reducing the strength of the carbon fiber bundle, or even causing the carbon fiber bundle to break. Summary of the Invention

[0005] Based on the above analysis, the embodiments of the present invention aim to provide a carbon fiber stretching method to solve the following problems in the prior art: the material barrel and the material barrel shaft are not firmly attached, which easily leads to radial and axial movement of the filament roll, thereby causing tension fluctuations and trajectory deviation of the carbon fiber bundle; during the filament feeding process of the feeding unit, as the material barrel shaft rotates, the material barrel deforms, and the diameter changing component may detach from the material barrel; in the carbon fiber steam stretching process, uneven mixing of water mist and high-temperature steam will destroy the stability of the stretching environment; and water mist enters the side of the steam pipe from the inlet of the water mist pipe, resulting in uneven initial distribution of water mist in the steam flow.

[0006] The objective of this invention is mainly achieved through the following technical solutions: A method for stretching carbon fibers includes the following steps: Step A: Loading materials; Step B: Preheating; Step C: Threading the silk; Step D: Extend; Step E: End the extension.

[0007] Further, step A includes: inserting the raw filament roll into the first half-shaft of the material cylinder shaft.

[0008] Further, step B includes: starting the heating unit and supplying water mist to the steam pipe through the water mist pipe.

[0009] Furthermore, step B also includes: introducing high-temperature steam into the steam pipe.

[0010] Furthermore, step B also includes: the heating unit supplying gas into the heating cylinder to form a preheated environment.

[0011] Furthermore, step B also includes: the heating unit supplies gas into the stretching cylinder and forms a stretching environment.

[0012] Further, step C includes: drawing the carbon fiber bundle from the filament roll and passing it sequentially through the heating cylinder and the stretching cylinder, and finally connecting it to the winding unit.

[0013] Further, step D includes: starting the winding unit and the yarn feeding unit, the winding unit drives the carbon fiber bundle through the heating cylinder and the stretching cylinder, and the carbon fiber bundle is stretched under the action of high temperature steam.

[0014] Furthermore, step D further includes: simultaneously monitoring tension during the stretching process. Furthermore, a carbon fiber stretching device is used.

[0015] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects: (1) The present invention utilizes a crossbar to enable the axial socket to move along the axial direction of the first half shaft, and the radial top block can extend radially out of the outer wall of the first half shaft and connect with the inner wall of the material cylinder. The radial top block expands the width of the first half shaft and reduces the gap between the first half shaft and the material cylinder, thereby improving the tightness of the fit between the material cylinder and the material cylinder shaft. (2) The first mixing blade of the air supply section of the present invention is set at the inlet of the water mist pipe; when the steam flows through the inlet of the water mist pipe, it impacts the blade of the first mixing blade and drives the first mixing blade to rotate, thereby realizing the instantaneous disturbance of the water mist and dispersing the water mist in the steam flow. The angle of the blade of the second mixing blade is opposite to that of the blade of the first mixing blade, and the rotation direction of the second mixing blade is opposite to that of the first mixing blade, forming a reverse disturbance flow field, further enhancing the turbulent mixing effect of steam and water mist. (3) Press the locking key in the direction of the second half-axis of the present invention. The locking pin pushes the swing rod to rotate around the shaft pin along the locking pin groove, so that the hook is disengaged from the positioning groove. The cross bar and the axial socket move in the direction of the second half-axis under the action of the locking spring. The radial top block retracts, and the material cylinder can be easily removed. After the locking key is released, the locking spring resets and pushes back the locking key and the locking pin. The swing rod rotates in the opposite direction and pushes the cross bar to move in the direction of the first half-axis. The positioning groove re-engages with the hook. The radial top block extends radially and fits tightly against the inner wall of the material cylinder to achieve locking. The axial locking assembly of the present invention uses only one locking spring to achieve the dual functions of pressing to unlock and automatic reset, and the structure is compact. (4) When the barrel shaft of the present invention rotates, the drive motor starts, the telescopic actuator rotates accordingly, and can push the crossbar to make the radial top block extend further radially and press against the inner wall of the barrel more tightly; this process does not need to consider the rotation of the barrel shaft and does not need to be shut down, and can continuously enhance the degree of the radial top block pressing against the inner wall of the barrel during the production process, reducing the loosening of the barrel; (5) The central axis of the water mist pipe of the present invention is perpendicular to but does not intersect with the central axis of the steam pipe, forming an eccentric structure; when the slip ring rotates, it meshes with the transmission wheel through the gear ring, driving the fan shaft to rotate, thereby driving the intake fan to rotate; the operation of the fan generates a radial airflow blowing into the steam pipe, which quickly pushes the water mist to the central region of the steam flow, thereby breaking the laminar boundary layer of the steam flow and strengthening the turbulent mixing effect. Moreover, it only needs to rely on the fluid kinetic energy in the water mist pipe to drive the slip ring to rotate and the fan to operate synchronously, without the need for an additional power source, reducing the system energy consumption and complexity.

[0016] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the specification or be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained from the content specifically pointed out in the text and accompanying drawings. Attached Figure Description

[0017] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0018] Figure 1 This is a schematic diagram of the overall structure of the extension device; Figure 2 This is a schematic diagram of the overall structure of the extension device; Figure 3 This is a schematic diagram of the overall structure of the wire feeding unit; Figure 4 This is a schematic diagram of the longitudinal section structure of the heating unit and the extension unit; Figure 5 A schematic diagram of the overall structure of the first and second mixing mechanisms; Figure 6 This is a schematic diagram of the longitudinal section of the raw material supply section; Figure 7 This is a schematic diagram of the longitudinal section of the axial locking assembly; Figure 8 This is a schematic diagram of the overall structure of the third hybrid mechanism; Figure 9 This is a schematic diagram of the planar section structure of the third mixing mechanism; Figure 10 This is a schematic diagram of the internal structure of the third hybrid mechanism.

[0019] Figure label: 1-Fiber feeding unit; 2-Heating unit; 3-Extension unit; 4-Base; 5-Heating unit; 6-Carbon fiber bundle; 11-Shaft seat; 12-Barrel shaft; 13-Axial socket; 14-Crossbar; 15-Axial groove; 16-Radial top block; 17-Locking key; 18-Locking hook; 19-Locking spring; 20-Telescopic actuator; 21-Heating cylinder; 31-Extension cylinder; 51-Steam pipe; 52-Water mist pipe; 53-First mixing mechanism; 54-Second mixing mechanism 55-Third mixing mechanism; 171-Button body; 172-Connecting rod; 173-Locking pin; 181-Swing rod; 182-Hook; 183-Locking pin groove; 531-First support rod; 532-First mixing propeller; 541-Second support rod; 542-Second mixing propeller; 551-Housing; 552-Air inlet; 553-Rotating ring; 554-Rotating ring paddle; 555-Intake fan; 556-Fan shaft; 557-Transmission wheel. Detailed Implementation

[0020] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0021] Example 1: A specific embodiment of the present invention, such as Figure 1 As shown, a carbon fiber stretching method (hereinafter referred to as the stretching method) is disclosed, including the following steps: Step 1: Loading materials; When the filament roll is inserted laterally into the barrel shaft 12, there is a problem that the outer surfaces of the barrel and the barrel shaft 12 are not firmly attached, which can easily cause the filament roll to shift, thereby causing tension fluctuations and trajectory deviations in the carbon fiber bundle 6, reducing the strength of the carbon fiber bundle 6, or even causing the carbon fiber bundle 6 to break. To address this, the filament roll is inserted into the first half-shaft of the barrel shaft 12, and the crossbar 14 at the end of the second half-shaft is pushed, causing the axial socket 13 to move axially along the first half-shaft. This causes the radial top block 16 to extend radially out of the outer wall of the first half-shaft and connect with the inner wall of the barrel, thereby widening the first half-shaft to reduce the gap and improve the tightness of the fit between the barrel and the barrel shaft 12. Preferably, the positioning groove on the crossbar 14 engages with the hook 182 to lock the variable diameter assembly; The locking spring 19 resets and pushes back the locking key 17 and the locking pin 173, causing the swing rod 181 of the locking hook 18 to rotate in the opposite direction, pushing the crossbar 14 to move towards the first half-axis, so that the positioning groove on the crossbar 14 engages with the hook 182, and the radial top block 16 continues to press against the inner wall of the barrel, thus realizing the locking of the variable diameter assembly. Step 2: Preheat; Start the heating unit 5, supply water mist to the steam pipe 51 through the water mist pipe 52, and then introduce high temperature steam into the steam pipe 51 to supply gas to the heating cylinder 21 and the extension cylinder 31 respectively, forming a preheating environment and an extension environment respectively. Preferably, the heating unit 5 mixes steam and water mist: the water mist enters the circulation chamber of the housing 551 of the third mixing mechanism 55 through the water mist pipe 52, forms a circumferential flow, and is injected into the steam pipe 51 through the circumferentially distributed air inlets 552; the water mist airflow drives the rotating ring 554 and drives the slip ring 553 to rotate, balancing the flow differences of each air inlet 552; at the same time, the slip ring 553 meshes with the transmission wheel 557 through the gear ring, driving the intake fan 555 to rotate, generating radial airflow to push the water mist towards the center area of ​​the steam flow, enhancing turbulent mixing; Preferably, the steam and water mist are further mixed evenly before entering the heating cylinder 21 or the extension cylinder 31 by using a first mixing mechanism 53 and a second mixing mechanism 54 located downstream of the air inlet 552.

[0022] Step 3: Threading the silk; The carbon fiber bundle 6 is drawn out from the original filament roll and passed through the heating cylinder 21 and the stretching cylinder 31 in sequence, and finally connected to the winding unit. Step 4: Extend; Start the winding unit and the filament feeding unit 1. The winding unit drives the carbon fiber bundle 6 through the heating cylinder 21 and the stretching cylinder 31. Under the action of high temperature steam, the carbon fiber bundle 6 is stretched. The material cylinder shaft 12 rotates, driving the original filament roll to unwind at a uniform speed to ensure the tension of the carbon fiber bundle 6 is stable. Preferably, tension monitoring is performed simultaneously during the stretching process; Manually monitor the tension changes of carbon fiber bundle 6. If there is no change, continue with this step; if abnormal tension fluctuations occur, perform steady-state control simultaneously during the stretching process. Specifically, steady-state regulation includes: The drive assembly is activated, and the drive motor drives the telescopic actuator 20 to convert the rotational motion into the axial linear motion of the crossbar 14. This pushes the crossbar 14 to further extend the radial top block 16 radially, thereby increasing the tightness against the inner wall of the material cylinder and preventing the material cylinder from loosening during production. Step 5: End the extension; When the raw yarn roll is exhausted, the winding unit and yarn supply unit 1 are shut down, and the heating unit 5 stops. The telescopic actuator 20 is retracted by the drive motor. The locking key 17 is pressed manually. The locking pin 173 drives the swing rod 181 of the locking hook 18 to rotate in the opposite direction. The hook 182 disengages from the positioning groove on the crossbar 14. The locking spring 19 pushes the crossbar 14 to move towards the second half-axis. The radial top block 16 disengages from the inner wall of the barrel. Remove the barrel from the first half-shaft of the barrel shaft 12 to complete a single extension operation.

[0023] Compared with the prior art, this embodiment utilizes the crossbar 14 to enable the axial socket 13 to move axially along the first half-shaft. The radial top block 16 can extend radially out of the outer wall of the first half-shaft and connect with the inner wall of the material cylinder. The radial top block 16 expands the width of the first half-shaft and reduces the gap between the first half-shaft and the material cylinder, thereby improving the tightness of the fit between the material cylinder and the material cylinder shaft 12. When the locking key 17 is pressed towards the second half-shaft, the locking pin 173 pushes the swing rod 181 to rotate around the shaft pin along the locking pin groove 183. When the lever 181 moves, the hook 182 disengages from the positioning groove. Under the force of the locking spring 19, the crossbar 14 and the axial socket 13 move towards the second half-axis, and the radial top block 16 retracts, allowing the barrel to be easily removed. After releasing the locking key 17, the locking spring 19 resets and pushes back the locking key 17 and the locking pin 173. The swing rod 181 rotates in the opposite direction, pushing the crossbar 14 towards the first half-axis. The positioning groove re-engages with the hook 182, and the radial top block 16 extends radially and presses tightly against the inner wall of the barrel, achieving locking. The axial locking assembly achieves both push-to-unlock and automatic reset functions using only one locking spring 19, resulting in a compact structure. When the barrel shaft 12 rotates, the drive motor starts, and the telescopic actuator 20 rotates accordingly, pushing the crossbar 14 to further extend the radial top block 16, pressing it more tightly against the inner wall of the barrel. This process does not require consideration of the rotation of the barrel shaft 12 and does not require shutdown. It can continuously enhance the degree to which the radial top block 16 presses against the inner wall of the barrel during the production process, reducing the loosening of the barrel.

[0024] Example 2: A specific embodiment of the present invention, such as Figure 2 As shown, a carbon fiber stretching device (hereinafter referred to as the stretching device) utilizing Embodiment 1 is disclosed, including a yarn feeding unit 1, a heating unit 2, a stretching unit 3, a base 4, a heating unit 5, and a winding unit (not shown in the figure). The yarn feeding unit 1, the base 4, and the winding unit are all disposed on the ground. The heating unit 2 and the stretching unit 3 are both disposed on the base 4. Two sets of heating units 5 are respectively disposed on the heating unit 2 and the stretching unit 3. The yarn feeding unit 1 is used to hold the raw yarn roll, and the heating units 5 are used to supply a mixture of high-temperature steam and water mist to the heating unit 2 or the stretching unit 3, respectively.

[0025] The filament roll includes a carbon fiber bundle 6 and a barrel, with the carbon fiber bundle 6 wound around the barrel. The carbon fiber bundle 6 is continuously drawn out from the barrel, extended by the heating unit 2 and the stretching unit 3, and then wound up by the winding unit, completing the stretching process.

[0026] Preferably, such as Figure 3 As shown, the wire feeding unit 1 includes a bearing 11 and a barrel rotating shaft 12, which is rotatably mounted on the bearing 11. The barrel rotating shaft 12 includes a first half-shaft and a second half-shaft, the first half-shaft being used to insert into the barrel, and the second half-shaft being used to rotatably connect with the bearing 11.

[0027] Specifically, such as Figure 4 As shown, the heating unit 2 includes a cylindrical heating cylinder 21, and the extension unit 3 includes a cylindrical extension cylinder 31. The heating cylinder 21 and the extension cylinder 31 are connected. Preferably, the heating unit 5 includes a steam pipe 51 and a water mist pipe 52. One end of the two steam pipes 51 is connected to the heating cylinder 21 and the extension cylinder 31 respectively, and the other end is connected to a steam source. The water mist pipe 52 is connected to the steam pipe 51 and injects water mist treated by an atomizer into the steam pipe 51 to form a steam-water mist mixed airflow, which is then transported to the inner cavity of the heating cylinder 21 or the extension cylinder 31 through the steam pipe 51.

[0028] Because the water mist pipe 52 is located on the side wall of the steam pipe 51, there is a problem of uneven mixing due to the direct injection of water mist into the high-temperature steam flow. Therefore, as follows... Figure 5 As shown, the heating unit 5 also includes a first mixing mechanism 53, which is disposed on the inner wall of the steam pipe 51 and is used to agitate the steam and water mist so that they are mixed before entering the heating cylinder 21 or the extension cylinder 31.

[0029] Specifically, the first mixing mechanism 53 includes a first support rod 531 and a first mixing paddle 532. One end of the first support rod 531 is fixed to the inner wall of the steam pipe 51, and the other end of the first support rod 531 is rotatably connected to the first mixing paddle 532. The shaft of the first mixing paddle 532 extends along the steam flow direction, and multiple blades are provided on the shaft. The first mixing paddle 532 is located at the inlet where the water mist pipe 52 connects to the steam pipe 51. When the steam flows through the inlet of the water mist pipe 52, it impacts the blades and drives the first mixing paddle 532 to rotate, thereby achieving instantaneous disturbance of the water mist and dispersing the water mist in the steam flow.

[0030] The blades are at an angle of 15°-30° to the direction of steam flow.

[0031] Preferably, the heating unit 5 further includes a second mixing mechanism 54, which is located downstream of the first mixing mechanism 53. The second mixing mechanism 54 includes a second support rod 541 and a second mixing blade 542. The blade angle of the second mixing blade 542 is opposite to that of the first mixing blade 532, and the rotation direction of the second mixing blade 542 is opposite to that of the first mixing blade 532, forming a reverse disturbance flow field to further enhance the turbulent mixing effect of steam and water mist.

[0032] When the raw fiber spool is inserted laterally into the barrel shaft 12, there is a problem of poor adhesion between the barrel and the outer surface of the barrel shaft 12, which can easily cause the raw fiber spool to shift, leading to tension fluctuations and trajectory deviations in the carbon fiber bundle 6, reducing the strength of the carbon fiber bundle 6, and even causing the carbon fiber bundle 6 to break. Therefore, as follows... Figure 6As shown, the yarn feeding unit 1 also includes a diameter changing component, which makes the inner wall of the material cylinder fit with the diameter changing component, increasing the radial and axial stability of the raw yarn roll.

[0033] Specifically, both the first and second half-shafts are hollow round rods. The reducing assembly includes an axial socket 13 and a crossbar 14. The crossbar 14 is disposed within the rod bodies of the first and second half-shafts and is capable of sliding along the rod bodies of the first and second half-shafts. The axial socket 13 is disposed on the crossbar 14, and the crossbar 14 is used to push the axial socket 13 to move axially along the barrel shaft 12.

[0034] Preferably, the variable diameter assembly further includes an axial groove 15 and a radial top block 16. The axial groove 15 is disposed on the axial socket 13 and is arranged along the axis of the crossbar 14. The end of the axial groove 15 near the first half-shaft is the proximal end, and the end of the axial groove 15 near the second half-shaft is the distal end. The distance from the distal end to the axis of the crossbar 14 is greater than the distance from the proximal end to the axis of the crossbar 14. The radial top block 16 is radially inserted into the outer wall of the first half-shaft and connected to the axial groove 15, and can slide along the axial groove 15. Pushing the crossbar 14 at the end of the second half-shaft allows the axial socket 13 to move axially along the first half-shaft. The radial top block 16 can extend radially out of the outer wall of the first half-shaft and connect to the inner wall of the barrel. The radial top block 16 expands the width of the first half-shaft and reduces the gap between the first half-shaft and the barrel, thereby improving the tightness of the fit between the barrel and the barrel shaft 12.

[0035] Preferably, multiple axial grooves 15 and radial top blocks 16 are provided and are evenly distributed along the circumference of the axial socket 13, so that the center line of the material cylinder coincides with the central axis of the first half shaft, thereby reducing the radial movement of the raw yarn roll.

[0036] There is a problem that the reducing assembly cannot lock automatically, and the radial top block 16 may retract into the first half-shaft, causing the material barrel to disengage from the material barrel shaft 12. To address this, the wire feeding unit 1 also includes an axial locking assembly, which is used to lock or unlock the reducing assembly.

[0037] Specifically, such as Figure 7 As shown, the axial locking assembly includes a locking key 17, a locking hook 18, and a locking spring 19. The locking key 17 is located at the end of the first half-shaft and can press and compress the locking spring 19 along the axial direction of the first half-shaft. The locking hook 18 is hinged to the first half-shaft via a pivot pin. One end of the locking spring 19 is connected to the locking key 17, and the other end of the locking spring 19 is connected to the crossbar 14. The locking spring 19 is used to push the crossbar 14 towards the second half-shaft, so that the axial socket 13 moves towards the second half-shaft, and the radial top block 16 can be radially retracted into the outer wall of the first half-shaft and disengaged from the barrel so that the barrel can be removed from the barrel shaft 12. It is also used to push the locking key 17 towards the end of the first half-shaft, so that the locking key 17 is reset.

[0038] Preferably, such as Figure 6and Figure 7 As shown, the barrel shaft 12 also includes a cover, which is threaded to the end of the first half-shaft. The cover has a through hole to accommodate the locking key 17. The locking key 17 includes a key body 171, a connecting rod 172, and a locking pin 173. The locking pin 173 is fixedly connected to the key body 171 via the connecting rod 172. The locking hook 18 includes a swing rod 181, a hook 182, and a locking pin groove 183. The middle part of the swing rod 181 is hinged to the first half-shaft via a pin. The hook 182 is located at one end of the swing rod 181, and the locking pin groove 183 is located at the other end of the swing rod 181. The locking pin 173 is embedded in the locking pin groove 183 and can slide along the locking pin groove 183. The variable diameter assembly also includes positioning grooves. Multiple positioning grooves are provided and are axially located on the crossbar 14. The positioning grooves can engage with the hook 182. When the locking key 17 is pressed towards the second half-axis, the locking pin 173 pushes the swing rod 181 to rotate around the pivot pin along the locking pin groove 183, causing the hook 182 to disengage from the positioning groove. Under the elastic force of the locking spring 19, the crossbar 14 and the axial socket 13 move towards the second half-axis, and the radial top block 16 retracts, allowing the material cylinder to be easily removed. After releasing the locking key 17, the locking spring 19 resets and pushes the locking key 17 and the locking pin 173 back. The swing rod 181 rotates in the opposite direction, pushing the crossbar 14 towards the first half-axis. The positioning groove re-engages with the hook 182, and the radial top block 16 extends radially and presses tightly against the inner wall of the material cylinder, achieving locking. The axial locking assembly achieves both press-to-unlock and automatic reset functions using only one locking spring 19, resulting in a compact structure.

[0039] During the wire feeding process of wire feeding unit 1, as the barrel shaft 12 rotates, the barrel deforms, and the problem of the diameter-changing component detaching from the barrel may still occur. Therefore, preferably, as follows: Figure 2 As shown, the wire feeding unit 1 also includes a drive assembly, which synchronously drives the diameter-changing assembly when the barrel shaft 12 rotates. The drive assembly includes a drive motor (not shown), a telescopic actuator 20, and a telescopic actuator seat. Both the drive motor and the telescopic actuator 20 are mounted on the telescopic actuator seat. One end of the telescopic actuator 20 is connected to the output shaft of the drive motor, and the other end can abut against the end of the crossbar 14, thereby converting the rotational motion of the motor into the axial linear motion of the crossbar 14 through the telescopic actuator 20. When the barrel shaft 12 rotates, the drive motor starts, and the telescopic actuator 20 pushes the crossbar 14, causing the radial top block 16 to extend further radially and press more firmly against the inner wall of the barrel. This process does not require consideration of the rotation of the barrel shaft 12 and does not require shutdown, thereby enhancing the degree to which the radial top block 16 presses against the inner wall of the barrel during production and reducing barrel loosening.

[0040] To address the issue that water mist enters the side of steam pipe 51 from the inlet of water mist pipe 52, resulting in uneven initial distribution of water mist in the steam flow, which hinders thorough mixing of water mist and steam, the following measures are taken: Figure 8 As shown, the heating unit 5 also includes a third mixing mechanism 55, which is located outside the steam pipe 51. Water mist is injected into the steam pipe 51 from multiple directions. The water mist can be evenly added to the steam flow in the circumferential direction of the steam flow, further improving the mixing uniformity.

[0041] Specifically, such as Figure 9 and Figure 10 As shown, the third mixing mechanism 55 includes a housing 551, which is disposed on the outer wall of the steam pipe 51, and a water mist pipe 52 is connected to the housing 551. The housing 551 has an annular hollow structure, and the annular hollow part of the housing 551 is a circulation chamber. The water mist input by the water mist pipe 52 first enters the circulation chamber of the housing 551, forming a circumferential flow within the circulation chamber. The outer wall of the steam pipe 51 is provided with multiple circumferentially distributed water mist inlets 552, each of which is connected to the circulation chamber. The water mist is injected into the steam pipe 51 through the multiple circumferentially distributed inlets 552, thereby adding steam flow in multiple directions around the steam flow, increasing the initial contact area and distribution uniformity between the water mist and the steam.

[0042] Preferably, the first mixing mechanism 53 and the second mixing mechanism 54 are located downstream of the air inlet 552. The steam and water mist are further mixed to enhance uniformity before entering the heating cylinder 21 or the extension cylinder 31.

[0043] To address the issue of varying flow rates at different inlets, the third mixing mechanism 55 preferably includes a rotating ring 553 and a rotating ring paddle 554. The rotating ring 553 is fitted onto the outer wall of the steam pipe 51, and the rotating ring paddle 554 is evenly distributed circumferentially around the outer circumference of the rotating ring 553. The central axis of the water mist pipe 52 is perpendicular to but does not intersect with the central axis of the steam pipe 51, forming an eccentric structure. When water mist is injected into the housing 551 through the water mist pipe 52, the water mist can blow the rotating ring paddle 554, causing the rotating ring 553 to rotate around the outer wall of the steam pipe 51. The rotating ring 553 causes the water mist in the circulation chamber to form a circumferential pressure distribution, thereby balancing the flow rate differences at each inlet 552, improving the uniformity of the flow rate at each inlet 552, and further increasing the uniformity of the initial contact between the water mist and the steam.

[0044] To further enhance the mixing effect of water mist and steam flow, preferably, the third mixing mechanism 55 also includes an intake fan 555, a fan shaft 556, and a drive wheel 557. One end of the fan shaft 556 is rotatably connected to the inner wall of the housing 551, and the other end of the fan shaft 556 is fixedly connected to the intake fan 555. The intake fan 555 is disposed in the air inlet 552. The drive wheel 557 is sleeved on the fan shaft 556 and meshes with the gear ring on the outer circumference of the slip ring 553. When the slip ring 553 rotates, it drives the fan shaft 556 to rotate through the meshing of the gear ring and the drive wheel 557, thereby driving the intake fan 555 to rotate. The operation of the fan 555 generates a radial airflow that blows into the steam pipe 51, rapidly pushing the water mist towards the central region of the steam flow, thereby breaking the laminar boundary layer of the steam flow and enhancing the turbulent mixing effect. Moreover, the rotation of the slip ring 553 and the operation of the fan 555 can be driven synchronously by the fluid kinetic energy in the water mist pipe 52, without the need for an additional power source, thus reducing system energy consumption and complexity.

[0045] Compared with the prior art, in this embodiment, the first mixing impeller 532 of the heating unit 5 is located at the inlet of the water mist pipe 52. When the steam flows through the inlet of the water mist pipe 52, it impacts the blades of the first mixing impeller 532 and drives the first mixing impeller 532 to rotate, thereby achieving instantaneous disturbance of the water mist and dispersing the water mist in the steam flow. The blade angle of the second mixing impeller 542 is opposite to that of the blade angle of the first mixing impeller 532, and the rotation direction of the second mixing impeller 542 is opposite to that of the first mixing impeller 532, forming a reverse disturbance flow field, further enhancing the turbulent mixing effect of steam and water mist. The water mist input by the water mist pipe 52 in this embodiment first enters the circulation chamber of the housing 551, forming a circumferential flow in the circulation chamber. Each air inlet 552 is connected to the circulation chamber. The water mist is injected into the steam pipe 51 through multiple circumferentially distributed air inlets 552, thereby creating a circumferential disturbance flow field in the steam flow. By introducing steam flow from multiple directions, the initial contact area and distribution uniformity between water mist and steam are increased. The central axis of the water mist pipe 52 is perpendicular to but does not intersect with the central axis of the steam pipe 51. The water mist can blow the rotating ring 554 and drive the slip ring 553 to rotate around the outer wall of the steam pipe 51. The rotating slip ring 553 causes the water mist in the circulation chamber to form a circumferential pressure distribution, thereby balancing the flow differences of each air inlet 552, improving the flow uniformity of each air inlet 552, and further increasing the uniformity of the initial contact between water mist and steam. When the slip ring 553 rotates, it meshes with the transmission wheel 557 through the gear ring, driving the fan shaft 556 to rotate, which in turn drives the intake fan 555 to rotate. The operation of the fan 555 generates a radial airflow that blows into the interior of the steam pipe 51, quickly pushing the water mist to the central region of the steam flow, thereby breaking the laminar boundary layer of the steam flow and strengthening the turbulent mixing effect. Moreover, the rotation of the slip ring 553 and the operation of the fan 555 can be driven synchronously by the fluid kinetic energy in the water mist pipe 52, without the need for an additional power source, thus reducing system energy consumption and complexity.

[0046] In this embodiment, the end of the second half-shaft pushes the crossbar 14, enabling the axial socket 13 to move axially along the first half-shaft. The radial top block 16 can extend radially out of the outer wall of the first half-shaft and connect with the inner wall of the material cylinder. The radial top block 16 expands the width of the first half-shaft and reduces the gap between the first half-shaft and the material cylinder, thereby improving the tightness of the fit between the material cylinder and the material cylinder shaft 12. When the locking key 17 is pressed towards the second half-shaft, the locking pin 173 pushes the swing rod 181 to rotate around the shaft pin along the locking pin groove 183. When the lever 181 moves, the hook 182 disengages from the positioning groove. Under the force of the locking spring 19, the crossbar 14 and the axial socket 13 move towards the second half-axis, and the radial top block 16 retracts, allowing the barrel to be easily removed. After releasing the locking key 17, the locking spring 19 resets and pushes back the locking key 17 and the locking pin 173. The swing rod 181 rotates in the opposite direction, pushing the crossbar 14 towards the first half-axis. The positioning groove re-engages with the hook 182, and the radial top block 16 extends radially and presses tightly against the inner wall of the barrel, achieving locking. The axial locking assembly achieves both push-to-unlock and automatic reset functions using only one locking spring 19, resulting in a compact structure. When the barrel shaft 12 rotates, the drive motor starts, and the telescopic actuator 20 rotates accordingly, pushing the crossbar 14 to further extend the radial top block 16, pressing it more tightly against the inner wall of the barrel. This process does not require consideration of the rotation of the barrel shaft 12 and does not require shutdown. It can continuously enhance the degree to which the radial top block 16 presses against the inner wall of the barrel during the production process, reducing the loosening of the barrel.

[0047] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for stretching carbon fibers, characterized in that, Includes the following steps: Step A: Loading materials; Step B: Preheating; Start the heating unit (5) and supply water mist to the steam pipe (51) through the water mist pipe (52); Introduce high-temperature steam into the steam pipe (51); The water mist enters the circulation chamber of the shell (551) through the water mist pipe (52), forms a circumferential flow, and is then injected into the steam pipe (51) through the circumferentially distributed air inlets (552); The heating unit (5) includes a steam pipe (51), a water mist pipe (52), a first mixing mechanism (53), a second mixing mechanism (54), and a third mixing mechanism (55). The water mist pipe (52) is connected to the steam pipe (51) to form a steam-water mist mixed airflow. The first mixing mechanism (53) is installed on the inner wall of the steam pipe (51). The first mixing mechanism (53) includes a first support rod (531) and a first mixing paddle (532). One end of the first support rod (531) is fixed to the inner wall of the steam pipe (51). The other end of the first support rod (531) is rotatably connected to the first mixing blade (532). The shaft of the first mixing blade (532) extends along the steam flow direction, and multiple blades are provided on the shaft. The first mixing blade (532) is located at the inlet where the water mist pipe (52) connects to the steam pipe (51). When the steam flows through the inlet of the water mist pipe (52), it drives the first mixing blade (532) to rotate. The second mixing mechanism (54) includes the second support rod (541) and the second mixing blade (542). The second mixing blade (542) has... The rotation direction is opposite to that of the first mixing impeller (532); the third mixing mechanism (55) includes a housing (551), which is disposed on the outer wall of the steam pipe (51), and the water mist pipe (52) is connected to the housing (551); the housing (551) is an annular hollow structure, and the annular hollow part of the housing (551) is a circulation chamber; the outer wall of the steam pipe (51) is provided with a plurality of circumferentially distributed water mist inlet holes (552), and each inlet hole (552) is connected to the circulation chamber; the second mixer The structure (54) is located downstream of the first mixing mechanism (53); the central axis of the water mist pipe (52) is perpendicular to but does not intersect with the central axis of the steam pipe (51), forming an eccentric structure; the third mixing mechanism (55) also includes a rotating ring (553), a rotating ring paddle (554) and an air intake fan (555), the rotating ring (553) is sleeved on the outer wall of the steam pipe (51), the rotating ring paddle (554) is evenly distributed around the outer periphery of the rotating ring (553), and the air intake fan (555) is located in the air intake hole (552); Step C: Threading the silk; Step D: Extend; Step E: End the extension.

2. The carbon fiber stretching method according to claim 1, characterized in that, Step A includes: winding the raw filament into the first half of the material cylinder shaft (12).

3. The carbon fiber stretching method according to claim 1, characterized in that, Step B further includes: the heating unit (5) supplies gas into the heating cylinder (21) and forms a preheating environment.

4. The carbon fiber stretching method according to claim 1, characterized in that, Step B further includes: the heating unit (5) supplies gas into the extension cylinder (31) and forms an extension environment.

5. The carbon fiber stretching method according to claim 1, characterized in that, Step C includes: drawing the carbon fiber bundle (6) out from the original filament roll and passing it sequentially through the heating cylinder (21) and the stretching cylinder (31), and finally connecting it to the winding unit.

6. The carbon fiber stretching method according to claim 1, characterized in that, Step D includes: starting the winding unit and the yarn supply unit (1), the winding unit drives the carbon fiber bundle (6) through the heating cylinder (21) and the stretching cylinder (31), and the carbon fiber bundle (6) is stretched under the action of high temperature steam.

7. The carbon fiber stretching method according to claim 6, characterized in that, Step D also includes: simultaneously monitoring tension during the stretching process.

8. The carbon fiber stretching method according to any one of claims 1-7, characterized in that, Carbon fiber stretching is performed using a carbon fiber stretching device.

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