A yarn storage device for a carbon fiber production line

Abstract

The application discloses a yarn storage device for a carbon fiber production line and relates to the technical field of carbon fiber production line equipment, which comprises a rack assembly, a lifting roller assembly, a counterweight, a synchronous lifting assembly and an upper roller assembly. The upper roller assembly is installed on the upper crosspiece of the rack assembly, the lifting roller assembly is installed on the vertical crosspiece of the rack assembly and can reciprocatingly lift along the vertical direction, and the two sides of the lifting roller assembly are symmetrically provided with the counterweights; the synchronous lifting assembly is fixedly connected with the two sides of the lifting roller assembly and drives the lifting roller assembly to synchronously lift along the vertical direction. The yarn storage device solves the problems of short yarn storage length, large occupied area and easy yarn deviation of the existing dancing roller type yarn storage mechanism, greatly improves the speed matching between the production line equipment, reduces the operation difficulty and improves the production efficiency.

Description

Technical Field

[0001] This invention relates to the field of carbon fiber production line equipment technology, specifically to a yarn storage device for a carbon fiber production line. Background Technology

[0002] Carbon fiber, as a high-performance new material, possesses excellent properties such as high strength, high modulus, high temperature resistance, friction resistance, thermal conductivity, and corrosion resistance. It also has low density and extremely high specific strength and specific modulus. Primarily used as a reinforcing material in composites with resins, metals, ceramics, and other carbon compounds, it is widely applied in high-end manufacturing fields such as aerospace, rail transportation, and new energy vehicles.

[0003] In recent years, with the rapid development of the aerospace industry, the domestic demand for carbon fiber has been growing rapidly. Domestic carbon fiber manufacturers have made significant breakthroughs in large-scale production and technology, realizing continuous production of carbon fiber. However, while carbon fiber production lines operate continuously at a constant speed, some process equipment, such as weft insertion equipment, crimping equipment, and sickle-type cutting machines, require intermittent or variable-speed operation and cannot be directly matched with continuous production lines.

[0004] Existing technologies typically employ dancing roller-type yarn storage mechanisms to address the aforementioned speed matching issues. However, these mechanisms have several significant drawbacks: First, the yarn storage length is short, usually only meeting the buffer requirements of a few seconds to a dozen seconds, making it unsuitable for prolonged equipment start-ups, shutdowns, or speed adjustments. Second, the rotary structure occupies a large area, increasing the space required for the production line. Third, the poor synchronization between the two sides of the roller easily leads to yarn deviation and uneven tension, affecting the quality of carbon fiber products and, in severe cases, even causing yarn breakage and production line shutdown.

[0005] Therefore, there is an urgent need to develop a yarn storage device for carbon fiber production lines that features a long yarn storage length, good synchronization, small footprint, and stable operation, in order to improve the overall operating efficiency and product quality of the production line. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a yarn storage device for carbon fiber production lines. By using a synchronous lifting assembly to force the lifting rollers to rise and fall synchronously on both sides, the vertical displacement of the lifting rollers is utilized to achieve dynamic storage and release of carbon fiber yarns, effectively balancing the speed difference between the front and rear equipment of the production line. This solves the technical problems of existing dancing roller-type yarn storage mechanisms, such as short yarn storage length, large footprint, and easy yarn deviation.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A yarn storage device for a carbon fiber production line includes a frame assembly and an upper roller assembly. The upper roller assembly is mounted on the upper crossbar of the frame assembly. A lifting roller assembly capable of reciprocating vertically is mounted on the vertical crossbar of the frame assembly. Counterweights are symmetrically mounted on both sides of the lifting roller assembly. A synchronous lifting assembly is also provided on the frame assembly. The synchronous lifting assembly is fixedly connected to both sides of the lifting roller assembly and drives the lifting roller assembly to move synchronously vertically.

[0008] Furthermore, the frame assembly includes a frame on which limit blocks and hydraulic buffer screws are respectively installed at the upper and lower limit positions of the lifting roller assembly stroke. The limit blocks are used to limit the maximum lifting stroke of the lifting roller assembly, and the hydraulic buffer screws are used to provide buffering when the lifting roller assembly reaches the lifting stroke limit.

[0009] Furthermore, multiple adjustable feet are evenly installed at the bottom of the frame. These adjustable feet are used to adjust the levelness and overall installation position of the frame. Guardrails are fixedly installed around the frame to isolate the operating area of ​​the device from the activity area of ​​personnel.

[0010] Furthermore, the guardrails around the frame are equipped with grating sensors, which are electrically connected to the production line control system and are used to issue an audible and visual alarm when personnel are detected approaching the operating area of ​​the device.

[0011] Furthermore, the lifting roller assembly includes a slide rail, a bearing seat, and a lifting roller; the slide rail is vertically fixedly installed inside the support of the frame, the bearing seat is slidably installed on the slide rail, and the lifting roller is rotatably supported on the bearing seat via a rotating shaft.

[0012] Furthermore, the lifting roller moves freely up and down in the vertical direction along the slide rail with the bearing seat; when the yarn tension is greater than the total weight of the lifting roller assembly and the counterweight, the lifting roller moves upward; when the yarn tension is less than the total weight of the lifting roller assembly and the counterweight, the lifting roller moves downward, thereby realizing the dynamic storage and release of yarn through the lifting displacement of the lifting roller.

[0013] Furthermore, the counterweights are detachably installed on both sides of the bearing seat, and the weights of the counterweights on both sides of the same set of lifting roller assemblies are completely equal; when the device is equipped with multiple sets of lifting roller assemblies, the total weight of the counterweights of each set of lifting roller assemblies is distributed in a step-by-step manner, so that multiple sets of lifting roller assemblies can be raised and lowered in a step-by-step manner in a preset order.

[0014] Furthermore, the synchronous lifting assembly includes a synchronous belt, synchronous pulleys, a synchronous shaft, and bearings; the bearings are respectively fixedly installed on both sides of the upper and lower ends of the frame, the synchronous shaft is horizontally rotatably supported and installed in the corresponding bearings on the left and right sides, the synchronous pulleys are fixedly fitted on both ends of the synchronous shaft, the synchronous belt is meshing and drivingly fitted on the two corresponding synchronous pulleys on the upper and lower sides, and the two sides of the bearing seat are respectively fixedly connected to the synchronous belt on the corresponding side.

[0015] Furthermore, the synchronous belt is a low-elongation composite synchronous belt with steel wires embedded inside.

[0016] Furthermore, the upper roller assembly includes a roller and an adjustable bearing housing; the adjustable bearing housing is suspended and fixedly installed below the upper crossbar of the frame, and the roller is rotatably mounted on the adjustable bearing housing via a rotating shaft.

[0017] This device achieves long-length, highly stable dynamic storage and release of carbon fiber yarn through the precise coordinated operation of its components, perfectly solving the speed matching problem between continuous production lines and intermittent process equipment.

[0018] The device is installed between individual pieces of equipment with speed differences before and after the carbon fiber production line. The carbon fiber yarn passes through the fixed upper roller and the vertically lifting roller in an "S" shaped path, forming multiple reciprocating yarn paths. When the production line is running normally and the speeds of the equipment before and after are matched, the yarn tension and the total weight of the lifting roller assembly and the counterweights on both sides reach dynamic equilibrium. The lifting roller and the bearing seat remain stationary in the middle position of the slide rail, and the device is in a standby equilibrium state.

[0019] When upstream equipment speeds up or downstream equipment speeds down, the yarn supply exceeds the demand, and the yarn tension decreases accordingly. When the tension is less than the total weight of the lifting roller assembly and the counterweight, gravity drives the lifting roller to move downwards along the vertical slide rail, storing excess yarn by increasing the total length of the yarn winding path. Conversely, when downstream equipment speeds up or upstream equipment speeds down, the yarn demand exceeds the supply, and the yarn tension increases. When the tension exceeds the total weight, the yarn tension overcomes gravity, driving the lifting roller upwards, releasing the pre-stored yarn by shortening the total length of the yarn path, thus compensating for the speed difference. During this process, the detachable design of the counterweight allows for flexible adjustment of the total counterweight according to the tension requirements of different specifications of carbon fiber yarn. The equal weight configuration on both sides ensures the static balance of the lifting roller assembly, while the dynamic balance accuracy requirement of no less than 1 / 1000 ensures smooth rotation of the lifting roller, preventing vibration-induced yarn tension fluctuations.

[0020] Addressing the core flaw of traditional dancing rollers, which are prone to tilting due to uneven force on both sides, leading to yarn misalignment, this device achieves mechanically forced synchronization control through a synchronous lifting assembly. Two synchronous shafts are horizontally supported at both ends of the frame by bearings. Synchronous pulleys are connected to the synchronous shafts via keys, ensuring no relative rotation. The synchronous belts on both sides mesh with corresponding synchronous pulleys on the upper and lower sides and are fixedly connected to the lifting roller bearing housing. When the lifting roller moves up or down, movement on either side drives the synchronous shaft to rotate via the synchronous belt. The rigid connection of the synchronous shaft forces the synchronous pulley on the other side to rotate at the exact same speed, ensuring that the lifting speed and displacement of the synchronous belts on both sides are completely consistent. Combined with a low-elongation composite synchronous belt with embedded steel wire, this achieves high-precision synchronization with a height difference of no more than 0.1mm on both sides of the lifting roller assembly, fundamentally eliminating the risk of yarn misalignment caused by roller tilting.

[0021] When a longer yarn storage length is required, multiple sets of lifting roller assemblies can be arranged side-by-side on the frame, with each set configured with a progressively increasing total weight of counterweights. As the yarn tension gradually increases, the first set of lifting roller assemblies with the lightest counterweight rises first. Only after reaching its upper limit position does the tension increase further, driving the second set with the heavier counterweight to rise, and so on, achieving sequential, stepped lifting of multiple sets of lifting roller assemblies. This design not only extends the total yarn storage length to 40 meters but also allows for more precise tension adjustment, adapting to speed fluctuations in different process stages.

[0022] Meanwhile, the adjustable bearing housing of the upper roller assembly can be independently adjusted up and down and forward and backward within a range of ±5mm to ensure the parallelism between all upper rollers and lifting rollers, further helping to prevent yarn deviation; the limit block of the frame assembly limits the maximum stroke of the lifting roller, and the hydraulic buffer screw provides 1-5 seconds of adjustable flexible buffer at the stroke limit to avoid rigid impact damaging the equipment or breaking the yarn; the guardrail and optional grating sensor constitute a multi-layer safety protection system to ensure the safety of personnel during the operation of the device.

[0023] Compared with the prior art, the beneficial effects of the present invention are: Large yarn storage length: Adopting a vertical lifting structure, the stroke of a single lifting roller can reach 1-2 meters, and the total yarn storage length can reach 40 meters, which can meet the needs of the production line for long-term equipment start-up or speed adjustment, and greatly improve the operational stability of the production line.

[0024] Good synchronization: The synchronous lifting roller is driven to lift and lower synchronously on both sides through the synchronous lifting component. The synchronization accuracy can reach within 0.1mm, which completely solves the problems of yarn deviation and uneven tension caused by the asynchronous movement of the two sides of the traditional dancing roller, and improves the quality of carbon fiber products.

[0025] Small footprint: Compared to the rotating dancing roller, the vertical lifting structure reduces the footprint by more than 50%, effectively saving production line space.

[0026] Flexible tension adjustment: By increasing or decreasing the number of counterweights and configuring stepped counterweights, the tension of different yarn storage can be precisely adjusted to meet the production needs of different specifications of carbon fiber yarn.

[0027] Safe and reliable: Equipped with limit blocks, hydraulic buffer screws, guardrails, and optional grating sensors, multiple safety protections ensure the safety of equipment and personnel; the suspended upper roller assembly facilitates maintenance and reduces equipment operating costs. Attached Figure Description

[0028] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the present invention; Figure 3 This is a schematic diagram of the rack assembly structure of the present invention; Figure 4 This is a schematic diagram of the lifting roller assembly structure of the present invention; Figure 5 This is a schematic diagram of the synchronous lifting component structure of the present invention; Figure 6 This is a schematic diagram of the upper roller assembly structure of the present invention; 1. Frame assembly; 2. Lifting roller assembly; 3. Counterweight; 4. Synchronous lifting assembly; 5. Upper roller assembly; 11. Frame; 12. Adjustable feet; 13. Limit block; 14. Hydraulic buffer screw; 15. Guardrail; 21. Lifting roller; 22. Bearing housing; 23. Slide rail; 41. Synchronous belt; 42. Synchronous belt pulley; 43. Synchronous shaft; 44. Bearing; 51. Roller; 52. Adjustable bearing housing. Detailed Implementation

[0029] The technical solutions of the present invention will now be described in detail with reference to the accompanying drawings.

[0030] like Figure 1 , 2 As shown, the present invention discloses a yarn storage device for a carbon fiber production line, which mainly consists of five parts: frame assembly 1, lifting roller assembly 2, counterweight 3, synchronous lifting assembly 4, and upper roller assembly 5.

[0031] The structure of rack assembly 1 is as follows Figure 3As shown, the assembly includes a frame 11, adjusting feet 12, limit blocks 13, hydraulic buffer screws 14, and guardrails 15. The frame 11 is welded from structural steel, forming a frame structure with sufficient strength and rigidity. Multiple mounting blocks are installed on the frame 11; the upper horizontal block is used to fix the upper roller assembly 5, and the vertical block is used to install the lifting roller assembly 2. Four adjusting feet 12 are evenly installed at the four corners of the bottom of the frame 11. By rotating the screws of the adjusting feet 12, precise adjustment of the level of the frame 11, as well as fine-tuning of its vertical, horizontal, and forward / backward positions, can be achieved, ensuring that the installation accuracy of the device meets production requirements.

[0032] Limit blocks 13 and hydraulic buffer screws 14 are installed on the vertical supports of the frame 11 at the upper and lower limit positions corresponding to the lifting stroke of the lifting roller assembly 2, respectively. Limit blocks 13 are made of high-strength steel and are used to limit the maximum lifting stroke of the lifting roller assembly 2, preventing it from exceeding the safe operating range. The installation height difference between the two limit blocks 13 is less than 0.1mm, ensuring that the lifting roller assembly 2 remains horizontal when it reaches its limit position. The hydraulic buffer screw 14 is installed beside the limit blocks 13, and its buffering time can be adjusted within the range of 1-5 seconds. It provides flexible buffering when the lifting roller assembly 2 reaches its stroke limit at high speed, absorbing impact energy and preventing equipment damage and yarn breakage caused by rigid collisions.

[0033] The frame 11 is fixedly surrounded by guardrails 15, which are welded from stainless steel square tubing and are at least 1.2 meters high. These guardrails isolate the operating area from the personnel activity area, preventing operators from accidentally entering dangerous areas. For highly automated production lines, optical grating sensors can be added to the guardrails 15. These sensors are electrically connected to the production line control system. When a person or object is detected entering the protected area, an audible and visual alarm signal is immediately issued, and the production line can be slowed down or stopped, further enhancing the safety level.

[0034] The structure of lifting roller assembly 2 is as follows Figure 4 As shown, the machine includes a lifting roller 21, bearing seats 22, and slide rails 23. Two slide rails 23 are vertically and parallelly fixedly installed on the inner sides of the left and right side supports of the frame 11. The slide rails 23 are high-precision linear guides, possessing excellent guiding accuracy and load-bearing capacity. Two bearing seats 22 are slidably fitted onto the left and right side slide rails 23, respectively. The lifting roller 21 is rotatably supported between the two bearing seats 22 via a rotating shaft.

[0035] The lifting roller 21 can move flexibly vertically along the slide rail 23 with the bearing seat 22. The standard lifting stroke of a single lifting roller 21 is 1.5 meters, which can be customized to 1 meter or 2 meters according to actual production needs. When the yarn tension is greater than the total weight of the lifting roller assembly 2 and the counterweight 3, the lifting roller 21 moves upward to release the yarn to compensate for the speed increase demand of the downstream equipment; when the yarn tension is less than the total weight, the lifting roller 21 moves downward to store the yarn to absorb the excess output of the upstream equipment; when the yarn tension equals the total weight, the lifting roller 21 remains stationary, at which point the speeds of the upstream and downstream equipment are matched. Through the lifting displacement of the lifting roller 21, the dynamic storage and release of yarn is realized, effectively balancing the speed difference between the upstream and downstream process equipment.

[0036] The counterweight 3 is made of cast iron and its surface is treated with paint for rust prevention. The counterweight 3 is detachably installed on the outer end face of the bearing seat 22 using bolts. The number of counterweights 3 in a single lifting roller assembly 2 is 1-10, each weighing 5 kg. The number and weight of the counterweights 3 on both the left and right sides must be exactly equal to ensure the static balance of the lifting roller assembly 2. After all counterweights 3 are installed, a dynamic balance test must be performed on the lifting roller assembly 2 to ensure its dynamic balance accuracy is not less than 1 / 1000, preventing vibration during high-speed rotation of the lifting roller 21 and affecting the stability of the yarn tension.

[0037] When a longer yarn storage length is required, multiple sets of lifting roller assemblies 2 can be arranged side-by-side on the frame 11. In this case, the total weight of the counterweights 3 in each set of lifting roller assemblies 2 increases in a stepped manner; for example, the first set has a total counterweight of 20 kg, the second set 25 kg, and the third set 30 kg. As the yarn tension gradually increases, the first set of lifting roller assemblies 2, with the lightest counterweight, rises first. After the first set reaches its upper limit position, the second set begins to rise, and so on, achieving a sequential stepped rise and fall of multiple sets of lifting roller assemblies 2, thereby obtaining a longer total yarn storage length.

[0038] The structure of the synchronous lifting component 4 is as follows: Figure 5 As shown, the assembly includes a synchronous belt 41, synchronous pulleys 42, a synchronous shaft 43, and bearings 44. The synchronous lifting assembly 4 has two sets of parallel synchronous shaft mechanisms, with four bearings 44 fixedly installed on the left and right sides of the upper and lower ends of the frame 11, respectively. The upper synchronous shaft 43 is horizontally rotatably supported within the bearings 44 on the left and right sides of the upper end of the frame 11, and the lower synchronous shaft 43 is horizontally rotatably supported within the bearings 44 on the left and right sides of the lower end of the frame 11. The synchronous pulleys 42 are fixedly fitted onto both ends of the synchronous shaft 43 via key connections, ensuring no relative rotation between the synchronous pulleys 42 and the synchronous shaft 43. The synchronous belt 41 engages with the corresponding two synchronous pulleys 42, forming a closed transmission circuit. The outer side of the bearing housing 22 is fixedly connected to the corresponding synchronous belt 41 via a connecting plate.

[0039] When the lifting roller assembly 2 moves up and down, it drives the synchronous belt 41 to move. The synchronous belt 41 drives the synchronous shaft 43 to rotate through the synchronous pulley 42. Due to the forced synchronization effect of the synchronous shaft 43, the synchronous belts 41 on both sides always maintain synchronous movement, thus ensuring that the height difference between the two sides of the lifting roller assembly 2 does not exceed 0.1mm. This fundamentally solves the problems of roller tilting and yarn deviation caused by asynchrony on both sides of traditional dancing rollers. The synchronous belt 41 is a polyurethane composite synchronous belt with embedded steel wires, which has extremely low elongation and high tensile strength, can maintain synchronization accuracy for a long time, and has a long service life.

[0040] The structure of the upper roller assembly 5 is as follows Figure 6 As shown, the machine includes rollers 51 and adjustable bearing seats 52. Multiple adjustable bearing seats 52 are fixedly mounted below the crossbars on the frame 11 using a suspended structure. Rollers 51 are rotatably supported between corresponding adjustable bearing seats 52 via rotating shafts. The adjustable bearing seats 52 have independent adjustment functions in both vertical and horizontal directions. By adjusting the position of the adjustable bearing seats 52, the parallelism between all upper rollers 51 and the lifting rollers 21 can be precisely ensured, further preventing yarn deviation. The surface of the upper rollers 51 also undergoes hard anodizing treatment, maintaining the same surface quality as the lifting rollers 21.

[0041] The suspended mounting structure leaves the bottom of the roller 51 unobstructed, allowing operators to easily clean the roller surface, removing attached carbon fiber lint and dust. It also facilitates roller maintenance and replacement, significantly reducing equipment maintenance difficulty and downtime.

[0042] The working process of this invention is as follows: The yarn storage device is installed between individual devices with a speed difference before and after the carbon fiber production line, such as between the pre-oxidation furnace and the carbonization furnace, or between the carbonization furnace and the crimping machine. The carbon fiber yarn sequentially passes around each upper roller 51 and the lifting roller 21, forming an "S"-shaped winding path.

[0043] When the production line is running normally, the speeds of the upstream and downstream equipment are matched, the yarn tension is stable, and the lifting roller 21 remains stationary in the middle position. When the downstream equipment speeds up or the upstream equipment speeds down, the yarn tension increases. When the tension exceeds the total weight of the lifting roller assembly 2 and the counterweight 3, the lifting roller 21 moves upward along the slide rail 23 to release the stored yarn and compensate for the speed difference. When the upstream equipment speeds up or the downstream equipment speeds down, the yarn tension decreases. When the tension is less than the total weight, the lifting roller 21 moves downward to store the excess yarn. During this process, the synchronous lifting assembly 4 always ensures that both sides of the lifting roller 21 move up and down synchronously to prevent the yarn from deviating.

[0044] When the lifting roller 21 reaches its upper or lower limit position, the limit block 13 restricts its continued movement, and the hydraulic buffer screw 14 absorbs the impact energy to prevent equipment damage. The operator can adjust the number of counterweights 3 according to the specifications of the produced carbon fiber yarn and the speed difference between the front and rear equipment to obtain a suitable yarn storage tension; the total yarn storage length can also be adjusted by increasing or decreasing the number of lifting roller components 2.

[0045] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. These embodiments are merely descriptions of preferred embodiments and are not intended to limit the scope or concept of the invention. The specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. Such combinations, as long as they do not violate the spirit of the present invention, should also be considered as part of this disclosure. To avoid unnecessary repetition, the present invention will not further describe the various possible combinations.

[0046] This invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this invention and without departing from the design idea of ​​this invention, all modifications and improvements made by those skilled in the art to the technical solutions of this invention should fall within the protection scope of this invention. The technical content for which protection is sought in this invention has been fully described in the claims.

Claims

1. A yarn storage device for a carbon fiber production line, comprising a frame assembly (1) and an upper roller assembly (5), the upper roller assembly (5) being mounted on the upper crossbar of the frame assembly (1), characterized in that: The frame assembly (1) is equipped with a lifting roller assembly (2) that can reciprocate vertically. The lifting roller assembly (2) is symmetrically equipped with counterweights (3) on both sides. The frame assembly (1) is also equipped with a synchronous lifting assembly (4). The synchronous lifting assembly (4) is fixedly connected to both sides of the lifting roller assembly (2) to drive the lifting roller assembly (2) to move synchronously vertically.

2. The yarn storage device for a carbon fiber production line according to claim 1, characterized in that: The frame assembly (1) includes a frame (11), on which limit blocks (13) and hydraulic buffer screws (14) are respectively installed at the upper and lower limit positions of the lifting roller assembly (2) stroke. The limit blocks (13) are used to limit the maximum lifting stroke of the lifting roller assembly (2), and the hydraulic buffer screws (14) are used to provide buffer when the lifting roller assembly (2) reaches the lifting stroke limit.

3. The yarn storage device for a carbon fiber production line according to claim 2, characterized in that: The bottom of the frame (11) is evenly equipped with multiple adjustable feet (12). The adjustable feet (12) are used to adjust the level of the frame (11) and the overall installation position. The frame (11) is fixedly equipped with guardrails (15) around its perimeter. The guardrails (15) are used to isolate the device operating area from the personnel activity area.

4. The yarn storage device for a carbon fiber production line according to claim 3, characterized in that: A grating sensor is installed on the guardrail (15) around the frame (11). The grating sensor is electrically connected to the production line control system and is used to issue an audible and visual alarm when it detects that a person is approaching the operating area of ​​the device.

5. The yarn storage device for a carbon fiber production line according to claim 1, characterized in that: The lifting roller assembly (2) includes a slide rail (23), a bearing seat (22), and a lifting roller (21); the slide rail (23) is vertically fixedly installed on the inner side of the stand of the frame (11), the bearing seat (22) is slidably installed on the slide rail (23), and the lifting roller (21) is rotatably supported on the bearing seat (22) by a rotating shaft.

6. The yarn storage device for a carbon fiber production line according to claim 5, characterized in that: The lifting roller (21) moves freely up and down in the vertical direction along the slide rail (23) with the bearing seat (22); when the yarn tension is greater than the total weight of the lifting roller assembly (2) and the counterweight (3), the lifting roller (21) moves upward; when the yarn tension is less than the total weight of the lifting roller assembly (2) and the counterweight (3), the lifting roller (21) moves downward. The dynamic storage and release of yarn are realized through the lifting displacement of the lifting roller (21).

7. The yarn storage device for a carbon fiber production line according to claim 5, characterized in that: The counterweight (3) is detachably installed on both sides of the bearing seat (22), and the weights of the counterweights (3) on both sides of the same set of lifting roller assemblies (2) are completely equal. When the device is equipped with multiple sets of lifting roller assemblies (2), the total weight of the counterweights (3) of each set of lifting roller assemblies (2) is distributed in a step-by-step manner, so that multiple sets of lifting roller assemblies (2) can be raised and lowered in a step-by-step manner in a preset order.

8. The yarn storage device for a carbon fiber production line according to claim 1, characterized in that: The synchronous lifting assembly (4) includes a synchronous belt (41), synchronous pulleys (42), a synchronous shaft (43), and bearings (44). The bearings (44) are fixedly installed on both sides of the upper and lower ends of the frame (11). The synchronous shaft (43) is horizontally rotatably supported and installed in the corresponding bearings on the left and right sides. The synchronous pulleys (42) are fixedly fitted on both ends of the synchronous shaft (43). The synchronous belt (41) is meshed and driven on the two corresponding synchronous pulleys (42) on the upper and lower sides. The two sides of the bearing seat (22) are fixedly connected to the synchronous belt (41) on the corresponding side.

9. The yarn storage device for a carbon fiber production line according to claim 8, characterized in that: The synchronous belt (41) is a low elongation composite synchronous belt with steel wire embedded inside.

10. The yarn storage device for a carbon fiber production line according to claim 1, characterized in that: The upper roller assembly (5) includes a roller (51) and an adjustable bearing seat (52); the adjustable bearing seat (52) is suspended and fixedly installed below the upper crossbar of the frame (11), and the roller (51) is rotatably mounted on the adjustable bearing seat (52) via a rotating shaft.

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