CN106629254B

CN106629254B - Carbon fiber expansion equipment and expansion method

Info

Publication number: CN106629254B
Application number: CN201611115535.9A
Authority: CN
Inventors: 周易
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-12-07
Filing date: 2016-12-07
Publication date: 2023-04-14
Anticipated expiration: 2036-12-07
Also published as: CN106629254A

Abstract

The invention discloses carbon fiber expansion equipment, which is characterized in that: comprises an uncoiling wire shaft, a deviation correcting device, an expanding device, a traction rotating shaft and a coiling device; the uncoiling wire shaft is connected with a servo motor through a mechanical arm; the deviation correcting device comprises a plurality of bracket wheels, and a light-sensitive distance measuring device is arranged in front of each bracket wheel; the expansion device comprises an air flow purging box body arranged on the magnetic suspension platform, and a purging plate with a plurality of micro-air holes is arranged in the air flow purging box body. The invention adopts the magnetic suspension platform to realize high-frequency vibration, the blowing plate is provided with a plurality of micro-pores, high-pressure gas is used for blowing and blowing the carbon fiber raw tows in an air flow manner and assisting hot steam to soften the sizing agent, the tows are continuously dispersed and expanded under the action of blowing and blowing in the air flow manner, the expansion manner hardly damages the raw tows, meanwhile, the sizing agent cannot fall off, the completeness of the tows is ensured, and the tows cannot be broken.

Description

Carbon fiber expansion equipment and expansion method

Technical Field

The invention relates to the field of processing equipment of carbon fiber bundles, in particular to expanding equipment of carbon fibers.

Background

With the development and maturity of high-tech manufacturing industries such as aerospace, wind power, novel automobiles and the like, related material application technologies such as carbon fiber material technology also make great progress and are widely applied. In practical application, large-tow carbon fibers, such as 48K, 60K, even 360K, 480K and the like, are much cheaper than small tows, the price of the large tows is only 50% -60% of that of the small tows, so the large-tow carbon fibers are more easily accepted by producers, but the large-tow carbon fibers have the defects that the fibers are bent and twisted along with the increase of the number of the fiber bundles, the resin matrix is not easy to infiltrate into the large-tow fiber bundles, pores are easy to generate among monofilaments, the enrichment and separation of the fiber phase and the resin phase are easy to cause, and the like, meanwhile, the possibility of fiber buckling and ply angle dislocation in the composite material forming process is increased along with the increase of the diameter of the tows, so that the strength and the rigidity of the composite material are influenced, the mechanical property is reduced, the dispersity is large, the requirement of structural design cannot be met, and the high-performance advantage of the carbon fiber reinforced material cannot be exerted, so that the key technology for breaking through the high-performance advantage of the low-cost large-tow carbon fiber is to develop the large-tow carbon fiber unfolding technology.

The conventional expanding mode of carbon fiber precursors adopts a hot rolling method, the invention patent, namely an expanding device (201410366783.5) of a carbon fiber bundle introduces an expanding device of the carbon fiber bundle, which comprises a preheating zone, a plurality of expanding zones and a finishing zone, wherein the preheating zone and the finishing zone are distributed at two sides of the expanding zone, convex rollers and concave rollers are distributed in the preheating zone and the expanding zone at intervals, and a plurality of flat rollers are arranged in the finishing zone; heating mechanisms are arranged in the convex roller, the concave roller and the flat roller; the left side of the preheating zone and the right side of the finishing zone are respectively provided with a first traction roller set and a second traction roller set, and the first traction roller set and the second traction roller set are both connected with motors. The carbon fiber bundle of the invention obtains widening in width during the process of continuously passing through the expansion of the convex roller and the contraction of the concave roller until becoming thinner. The expanded carbon fiber bundle is wide and thin, is uniform a fibrous unidirectional sheet; however, the mechanical properties of the carbon fibers spread by the method are greatly reduced, the fiber tows are easily abraded, the use of the carbon fibers is seriously influenced, and meanwhile, the method is low in speed and low in efficiency.

Invention patent-an apparatus for expanding fibre bundles and a process for its (201510417018.6), an apparatus for expanding fibre bundles is presented, characterized in that: comprises an uncoiling device, an expansion groove system, a traction and drying device and a coiling device; the uncoiling device comprises a damping controller, a tension monitoring device and at least two reels; the expansion tank system comprises a liquid tank, a hoisting frame and a plurality of ultrasonic transmitting heads. Introducing the carbon fiber bundle into a container filled with an ultrasonic generator and a chemical solution, the carbon fiber bundle is made thinner by controlling the ultrasonic frequency range, the type and the concentration of the solution and the drafting speed of the carbon fiber bundle in the solution; however, a layer of water-based sizing agent is attached to the surface of the carbon fiber precursor, the sizing agent on the surface of the precursor is damaged by an ultrasonic medium in the process of oscillation in the process of ultrasonic wave expansion, and the ultrasonic medium containing a large amount of sizing agent is detected and used for a period of time, so that the carbon fiber precursor without the sizing agent is dissolved and damaged in the ultrasonic process no matter what the ultrasonic medium is, and is difficult to compound with resin in the process of resin impregnation due to extremely smooth surface.

In order to overcome the problems of sizing agent damage and tow breakage in the expansion process, the invention provides a novel expansion device and a novel expansion method, wherein the sizing agent is softened by high-temperature steam spraying, and then high-pressure blowing is carried out, so that the purpose of carbon fiber expansion is achieved.

Disclosure of Invention

Aiming at the problems, the invention aims to provide novel carbon fiber expanding equipment and an expanding method, wherein the aim of expanding carbon fiber precursors is fulfilled by combining air flow blowing and steam spraying and by high-frequency vibration.

The technical scheme adopted by the invention for solving the technical problems is as follows: a carbon fiber expansion equipment which is characterized in that: comprises an uncoiling wire shaft, a deviation correcting device, an expanding device, a traction rotating shaft and a coiling device;

the uncoiling wire shaft is connected with the servo motor through a mechanical arm;

the deviation correcting device comprises a plurality of bracket wheels, and a light-sensitive distance measuring device is arranged in front of each bracket wheel;

the expansion device comprises an airflow purging box body arranged on the magnetic suspension platform, and a purging plate with a plurality of micro-pores is arranged in the airflow purging box body.

Further, the two ends of the uncoiling screw shaft are fixedly connected through claw-type mechanical arms, one end of each mechanical arm is fixedly connected with the servo motor, the mechanical arms are driven to rotate through the servo motors, and the rotation range of the mechanical arms is 360 degrees. When the raw silk bundle deflects or twists, the signal is transmitted to a servo motor, and the raw silk bundle is corrected through the reverse rotation of the servo motor; meanwhile, the rotation direction of the servo motor is +/-360 degrees, and the correction of the deflected raw silk bundle is ensured.

Furthermore, the shell of the deviation correcting device is a visible regular box body and comprises at least two bracket wheels, the light-sensitive distance measuring device is arranged on one side of the upstream of the bracket wheels, and the arrangement mode of the bracket wheels is linear, zigzag or any other shape. The width of the raw silk bundle is fixed, the width of the raw silk bundle is detected through the light-sensitive distance measuring device to mark whether the silk bundle is twisted or deflected, when the light-sensitive distance measuring device detects that the width of the silk bundle is smaller than a set value, the twisted direction and angle of the silk bundle are obtained through conversion in the controller, signals are transmitted to the servo motor, the servo motor controls the axial reverse rotation of the uncoiling silk, and the silk bundle is enabled to be restored to the original position; when the tows are twisted once, the second light-sensitive distance meter detects that the tows are twisted again, signals are transmitted to the servo motor, and the servo motor controls the uncoiling wire to rotate twice in the opposite direction; if the tows are detected to be twisted again, an alarm will be given, the whole expanding equipment stops working, and manual correction is adopted. Meanwhile, the number of the light-sensing distance meters is not limited to three, and can be more, and the arrangement mode of the light-sensing distance meters can be determined according to the installation site and the requirement of the equipment, and is not limited to the arrangement mode provided by the invention; meanwhile, the whole deviation correcting device can be arranged in a closed box body according to installation requirements, and a reserved observation window or the box body is made of transparent glass or resin materials, so that the stroke of the whole filament bundle is displayed in a visual range. The detection distance of the light-sensitive distance meter can be adjusted according to the model of the filament bundle, such as 12K filaments, the width of the filament bundle is 6.5mm, and if the light-sensitive signal detects that the width is less than 5mm, the filament bundle is twisted or deflected.

Furthermore, the expansion device is a regular box body, the purging plate is located in the middle of the expansion device, the expansion device is divided into an upper cavity and a lower cavity along the horizontal direction, the upper cavity and the lower cavity are respectively a steam spraying cavity and a high-pressure cavity, the two ends of the expansion device are respectively a wire inlet hole and a wire outlet hole, the two ends of the purging plate, which are connected with the wire inlet hole and the wire outlet hole, are arranged in an inverted angle shape, four anchoring points are arranged at four corners of the box body of the expansion device, and opposite charges are respectively communicated with the anchoring points and the magnetic suspension platform to form electromagnetic suspension.

Furthermore, the cross section of the micro-pores is conical, the inner diameter of the micro-pores is 0.4-0.6mm, and the spacing distance between adjacent micro-pores is 0.4-0.6mm.

Furthermore, a plurality of steam spraying holes are formed in the top of the steam spraying cavity, and the steam spraying temperature is 100-110 ℃.

Further, the high-pressure cavity is communicated with an air compressor, and the air pressure in the high-pressure cavity is 0.4-0.8MPa.

The expansion device adopted by the invention is designed by combining air flow blowing, steam heating and magnetic suspension vibration, carbon fiber raw tows enter the expansion device from filament inlet holes, a plurality of raw tows are flatly laid on a blowing plate, a cavity above the blowing plate is a steam spraying cavity, hot steam is sprayed to the raw tows through a plurality of steam spraying holes, the temperature of the steam is controlled to be 100-110 ℃, the softening temperature of a sizing agent on the surface of the raw tows is 90-100 ℃, the sizing agent on the surface of the carbon fiber raw tows entering the expansion device is gradually softened under the wrapping of the hot steam, so that the bonding acting force among the raw filaments in the tows is reduced, then compressed air introduced into a high-pressure cavity is continuously blown to the raw tows through micro-pores, meanwhile, the whole expansion device is arranged on a magnetic suspension platform, alternating current is introduced into the magnetic suspension platform, the alternating current frequency expansion device is controlled to continuously vibrate transversely through a frequency converter, the air flow passing through the micro-pores moves left and right under the condition of the left and right vibration of the expansion device, so that the air flow forms a blowing condition that the air flow moves left and right, and the softened raw filaments gradually disperse and expand under the blowing action of the air flow; the raw silk bundle passes through the expanding device continuously under the traction action of the traction device, is softened by hot steam and is blown by air flow, and the purpose of expanding the silk bundle is achieved.

Because the expansion device is arranged on the magnetic suspension platform, the vibration frequency of the expansion device can be controlled by the introduced alternating current frequency, the vibration frequency can reach the ultrasonic level, and meanwhile, the atmosphere of steam wrapping is not easy to cause the sizing agent to fall off.

Furthermore, an oil removal filtering device is arranged between the high-pressure cavity and the air compressor and is used for removing oily substances in the compressed air. The oily substance has certain damage to the sizing agent on the surface of the raw silk bundle.

A carbon fiber expansion method based on the apparatus of any one of the preceding claims, comprising the steps of:

(1) Sequentially mounting multi-spindle tow discs on an uncoiling spool;

(2) Leading out the tows from the uncoiling reel respectively, and respectively bypassing the corresponding light-sensitive distance measuring devices and the bracket wheels;

(3) The tows enter an expanding device and are flatly laid through a sweeping plate;

(4) The expanded tows pass through a traction device and are fed into a take-up device;

(5) Starting up the machine to operate after the connection is finished, detecting the width of each filament bundle through a light-sensitive distance meter, transmitting a signal to a servo motor on an uncoiling filament shaft after the filament bundles deflect, and enabling the filament bundles to recover the original positions through the rotation of the servo motor;

(6) A steam spraying cavity above the purging plate is opened for steam spraying, and a high-pressure cavity below the purging plate is subjected to air flow purging; and simultaneously, the expansion device starts magnetic suspension oscillation.

The invention has the advantages that:

1. the expansion device adopts a magnetic suspension platform, the high-frequency vibration of the expansion device can be controlled by a frequency converter, the vibration frequency can cover 50HZ-300HZ, and compared with any mechanical vibration, the vibration mode of the invention has greatly improved frequency and is not influenced by equipment;

2. the blowing plate in the expanding device is provided with a plurality of micro-pores, high-pressure gas performs air flow blowing to the carbon fiber tow through the micro-pores, a plurality of blowing air columns are formed on the blowing plate, the tow flatly laid on the blowing plate is quickly blown, hot steam is continuously sprayed out from the upper spraying holes, so that a sizing agent on the surface of the tow is softened, the tow is continuously dispersed and expanded under the action of air flow blowing, the expanding mode almost has no damage to the tow, meanwhile, the sizing agent cannot fall off, the tow is ensured to be complete, and the tow cannot be broken;

3. the width of each silk bundle is detected through the light sensation range finder, and after the silk bundle deflects, the signal transmission is for the servo motor on the uncoiling spool, and the silk bundle returns the normal position through the servo motor rotation, has avoided the silk bundle to take place the distortion or deflect when advancing.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a perspective view of the present invention.

Wherein: 1. the device comprises a uncoiling wire shaft 2, a deviation correcting device 3, an expanding device 4, a traction rotating shaft 5 and a coiling device;

101. mechanical arm 102 and servo motor

201. Bracket wheel 202 and light-sensitive range finder

301. Magnetic suspension platform 302, airflow purging box 303, micro-air hole 304, purging plate 305, steam spraying cavity 306, high-pressure cavity 307, wire inlet hole 308, wire outlet hole 309, anchoring point 310, steam spraying hole 311, air compressor 312 and oil removing and filtering device

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

A carbon fiber expansion device as shown in the figure is characterized in that: the device comprises an uncoiling wire shaft 1, a deviation correcting device 2, an expanding device 3, a traction rotating shaft 4 and a coiling device 5;

the uncoiling wire shaft 1 is connected with a servo motor 102 through a mechanical arm 101;

the deviation correcting device 2 comprises a plurality of bracket wheels 201, and a light-sensitive distance measuring device 202 is arranged in front of each bracket wheel 201;

the expansion device 3 comprises an airflow purging box body 302 arranged on a magnetic suspension platform 301, and a purging plate 304 with a plurality of micro-air holes 303 is arranged in the airflow purging box body 302.

Further, two ends of the uncoiling screw shaft 1 are fixedly connected through a claw-type mechanical arm 101, one end of the mechanical arm 101 is fixedly connected with a servo motor 102, the mechanical arm 101 is driven to rotate through the servo motor 102, and the rotation range of the mechanical arm 101 is 360 degrees. When the filament bundle deflects or twists, the signal is transmitted to the servo motor 102, and the filament bundle is corrected by the reverse rotation of the servo motor 102; meanwhile, the rotation direction of the servo motor 102 is +/-360 degrees, and the alignment of the deflected raw filament bundle is ensured.

Further, the casing of the deviation rectifying device 2 is a visible regular box body, and includes at least two or more bracket wheels 201, the light-sensing distance meter 202 is disposed at one side of the upstream of the bracket wheels 201, and the arrangement mode of the plurality of bracket wheels 201 is a linear type, a zigzag type or any other shape. The width of the raw silk bundle is fixed, the width of the raw silk bundle is detected through the light-sensitive distance measuring device 202 to mark whether the silk bundle is twisted or deflected, when the light-sensitive distance measuring device 202 detects that the width of the silk bundle is smaller than a set value, the twisting direction and angle of the silk bundle are obtained through conversion in the controller, signals are transmitted to the servo motor 102, the servo motor 102 controls the uncoiling silk shaft 1 to rotate in the opposite direction, and the silk bundle is enabled to return to the original position; when the filament bundle is twisted once, the second light-sensitive distance meter 202 detects that the filament bundle is twisted again, transmits a signal to the servo motor 102, and controls the uncoiling filament shaft 1 to rotate twice in the opposite direction through the servo motor 102; if the tows are detected to be twisted again through the third light-sensitive distance measuring device 202 in the process of continuing advancing, an alarm is given, the whole expanding device stops working, and manual correction is adopted. Meanwhile, the number of the light-sensing distance meters 202 is not limited to three, and may be more, and the arrangement of the light-sensing distance meters 202 may be determined according to the installation site and the requirement of the equipment, and is not limited to the arrangement provided by the present invention; meanwhile, the whole deviation correcting device 2 can be arranged in a closed box body according to installation requirements, and a reserved observation window or the box body is made of transparent glass or resin materials, so that the stroke of the whole tows is displayed in a visible range. The detection distance of the optical distance meter 202 can be adjusted according to the type of the filament bundle, such as 12K filament bundle, the width of the filament bundle is 6.5mm, if the optical signal detects less than 5mm, it means that the filament bundle is twisted or deflected.

Further, the expansion device 3 is a regular box body, the purging plate 304 is located in the middle of the expansion device 3, the expansion device 3 is divided into an upper cavity and a lower cavity along the horizontal direction, the upper cavity and the lower cavity are respectively a steam spraying cavity 305 and a high pressure cavity 306, two ends of the expansion device 3 are respectively a wire inlet hole 307 and a wire outlet hole 308, two ends of the purging plate 304, which are connected with the wire inlet hole 307 and the wire outlet hole 308, are arranged in an inverted angle shape, four anchoring points 309 are arranged at four corners of the box body of the expansion device 3, and opposite charges are respectively communicated between the anchoring points 309 and the magnetic suspension platform 301, so that electromagnetic suspension is formed. The bottom of the anchoring point is a metal sheet, electric charges are introduced into the metal sheet, and the whole airflow expansion box body is an insulating box body.

Further, the cross section of the micro-pores 303 is conical, the inner diameter of the micro-pores 303 is 0.4-0.6mm, and the spacing distance between adjacent micro-pores 303 is 0.4-0.6mm.

Further, a plurality of steam spraying holes 310 are formed in the top of the steam spraying cavity 305, and the steam spraying temperature is 100-110 ℃. The plurality of spraying steam holes are connected with a steam conveying pipeline and supply hot steam through a steam generator.

Further, the high pressure cavity 306 is communicated with an air compressor 311, and the air pressure in the high pressure cavity 306 is 0.4-0.8MPa.

The expanding device 3 adopted by the invention is designed by combining air flow blowing, steam heating and magnetic suspension vibration, carbon fiber raw tows enter the expanding device 3 from a tow inlet 307, a plurality of raw tows are flatly laid on a blowing plate 304, a cavity above the blowing plate 304 is a steam spraying cavity 305, hot steam is sprayed to the raw tows through a plurality of steam spraying holes 310, the temperature of the steam is controlled to be 100-110 ℃, the softening temperature of a sizing agent on the surfaces of the raw tows is 90-100 ℃, the sizing agent on the surfaces of the carbon fiber raw tows entering the expanding device 3 is gradually softened under the wrapping of the hot steam, so that the acting force between the raw tows in the tows is reduced, then compressed air introduced into a high-pressure cavity 306 is continuously blown to the raw tows through micro-pores 303, meanwhile, the whole expanding device 3 is arranged on a magnetic suspension platform 301, alternating current is introduced into the magnetic suspension platform 301, the alternating current frequency expanding device 3 is controlled by a frequency converter to continuously vibrate, the air flow passing through the micro-pores 303 moves left and right under the condition of the expanding device 3, so that the air flow forms a left and right blowing condition, and left and right movement of the air flow, and the expanded and single tows are gradually dispersed under the action of the softened raw tows; the tow is softened by hot steam and blown by air flow along with the tow continuously passing through the expanding device 3 under the traction action of the traction device, so that the purpose of tow expansion is achieved.

Because the expansion device 3 is arranged on the magnetic suspension platform 301, the vibration frequency of the expansion device 3 can be controlled by the introduced alternating current frequency, the vibration frequency can reach the ultrasonic level, and meanwhile, the atmosphere of steam wrapping is not easy to cause the sizing agent to fall off.

Further, an oil removing and filtering device 312 is disposed between the high pressure chamber 306 and the air compressor 311 for removing oily substances in the compressed air. The oily substance may damage the sizing agent on the surface of the tow.

A carbon fiber expansion method, characterized by comprising the steps of:

(1) Sequentially mounting multi-spindle tow discs on an uncoiling spool 1;

(2) Leading out the tows from the uncoiling spool 1 respectively, and respectively bypassing the corresponding light-sensitive distance measuring devices 202 and the bracket wheels 201;

(3) The tows enter the expanding device 3 and are flatly spread and pass through the blowing plate 304;

(4) The expanded tows pass through a traction device and are connected into a winding device 5;

(5) Starting up the machine to operate after the connection is finished, detecting the width of each tow through the light-sensitive distance measuring device 202, transmitting a signal to the servo motor 102 on the uncoiling spool 1 after the tows deflect, and enabling the tows to return to the original positions through the rotation of the servo motor 102;

(6) A steam spraying cavity 305 above the purging plate 304 is opened for steam spraying, and a high-pressure cavity 306 below the purging plate carries out air flow purging; at the same time, the expansion device 3 begins magnetic levitation oscillation.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and these modifications or substitutions do not depart from the spirit of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A carbon fiber expansion device is characterized in that: comprises an uncoiling wire shaft, a deviation correcting device, an expanding device, a traction rotating shaft and a coiling device;

the uncoiling wire shaft is connected with a servo motor through a mechanical arm;

the expansion device comprises an airflow purging box body arranged on the magnetic suspension platform, and a purging plate with a plurality of micro-pores is arranged in the airflow purging box body;

the expansion device is a regular box body, the blowing plate is positioned in the middle of the expansion device, the expansion device is divided into an upper cavity and a lower cavity along the horizontal direction, the upper cavity and the lower cavity are respectively a steam spraying cavity and a high-pressure cavity, two ends of the expansion device are respectively provided with a wire inlet hole and a wire outlet hole, four anchoring points are arranged at four corners of the box body of the expansion device, and opposite charges are respectively communicated with the anchoring points and the magnetic suspension platform to form electromagnetic suspension;

the top of the steam spraying cavity is provided with a plurality of steam spraying holes, and the steam spraying temperature is 100-110 ℃.

2. A carbon fiber expansion apparatus according to claim 1, wherein: the both ends of opening a book the silk axle are through jack catch type arm fixed connection, the one end and the servo motor fixed connection of arm, drive the arm through servo motor and rotate, the rotation range of arm is 360.

3. A carbon fiber expansion apparatus as claimed in claim 1, wherein: the shell of the deviation correcting device is a visible regular box body and comprises at least two bracket wheels, the light-sensing distance measuring device is arranged on one side of the upstream of the bracket wheels, and the arrangement mode of the bracket wheels is linear or zigzag.

4. A carbon fiber expansion apparatus according to claim 1, wherein: the cross section of the micro-pores is conical, the inner diameter of the micro-pores is 0.4-0.6mm, and the spacing distance between adjacent micro-pores is 0.4-0.6mm.

5. A carbon fiber expansion apparatus as claimed in claim 1, wherein: the high-pressure cavity is communicated with an air compressor, and the air pressure in the high-pressure cavity is 0.4-0.8MPa.

6. A carbon fibre expansion apparatus according to claim 5, wherein: and an oil removal filtering device is arranged between the high-pressure cavity and the air compressor and is used for removing oily substances in the compressed air.

7. A method for expanding carbon fibres, based on the device according to any one of the preceding claims, characterized in that it comprises the following steps:

(1) Sequentially mounting multi-spindle tow discs on an uncoiling spool;

(3) The tows enter an expanding device and are spread and pass through a sweeping plate;

(5) Starting up the machine to operate after the connection is finished, detecting the width of each tow through a light-sensitive distance measuring device, transmitting a signal to a servo motor on a decoiling spool after the tows deflect, and enabling the tows to recover the original positions through the rotation of the servo motor;