CN203729004U - Large tow carbon fiber unwinding device combining sound wave method and mechanical multiple-roller method - Google Patents

Large tow carbon fiber unwinding device combining sound wave method and mechanical multiple-roller method Download PDF

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Publication number
CN203729004U
CN203729004U CN201420038417.2U CN201420038417U CN203729004U CN 203729004 U CN203729004 U CN 203729004U CN 201420038417 U CN201420038417 U CN 201420038417U CN 203729004 U CN203729004 U CN 203729004U
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CN
China
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fibre bundle
roller
carbon fiber
tension
mechanical
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CN201420038417.2U
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Chinese (zh)
Inventor
李炜
李蓓蓓
朱家强
王滨
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东华大学
上海晋飞复合材料科技有限公司
上海晋飞日精复合材料有限公司
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Priority to CN201420038417.2U priority Critical patent/CN203729004U/en
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Abstract

The utility model provides a large tow carbon fiber unwinding device combining a sound wave method and a mechanical multiple-roller method. The large tow carbon fiber unwinding device combining the sound wave method and the mechanical multiple-roller method comprises a yarn unwinding device for containing fiber bundles. The large tow carbon fiber unwinding device combining the sound wave method and the mechanical multiple-roller method is characterized in that the fiber bundles enter a tension control device after being drawn forth from the yarn unwinding device, the tension control device controls the surface tension of the fiber bundles and maintains constant tension, the fiber bundles with the tension adjusted pass through the space between a pressure feed roller and a second supporting roller and then are brought into a yarn pre-unwinding device, the fiber bundles are pre-unwound by adopting a sound wave fiber expanding method though the yarn pre-unwinding device, the pre-unwound fiber bundles are brought into a main yarn unwinding device, the pre-unwound fiber bundles are unwound by adopting a mechanical multiple-roller fiber expanding method though the main yarn unwinding device, and the unwound fiber bundles are wound through a traction winding device. The large tow carbon fiber unwinding device combining the sound wave method and the mechanical multiple-roller method can unwind large tow carbon fibers effectively and fully.

Description

The sonic method large-tow carbon fiber expanding unit that combines with mechanical multiple roll cylinder method

Technical field

The utility model relates to a kind of sonic method large-tow carbon fiber expanding unit that combines with mechanical multiple roll cylinder method.

Background technology

Due to large-tow carbon fiber, as 48K, 60K to such an extent as to the price of 360K, 480K etc. than the considerably cheaper of little tow, large tow price only has the 50%-60% of little tow that the cost of advanced composite material can significantly be reduced.Large-tow carbon fiber is the same with little tow carbon fiber, can make composite, but material and processing cost differ greatly.Because from petroleum to carbon fiber, increment relation is 1 to 3, and carbon fiber is made to composite, and increment, to 10, that is to say that the cost of carbon fiber in composite only accounts for 25%-30%, and follow-up fibre forming parts processing cost accounts for 70%-75%.Select low cost large-tow carbon fiber can make following process save most cost, can realize high-performance carbon fibre composite cost degradation, meet the demand that the aspects such as space flight and aviation, wind electricity blade and automobile making grow with each passing day.

But large-tow carbon fiber exists along with fibre bundle radical increases and the complications of fiber occur, the phenomenon of kink, and resin matrix is not easy to infiltrate to large bunch fiber bundle inside, between monofilament, easily produce hole, and the enrichment that easily causes fiber phase and resin-phase with the defect such as separate, can increase with tow diameter simultaneously, the possibility that occurs fiber flexing and laying angular misalignment in composite material shaping process is also increasing, thereby make composite material strength, rigidity is influenced, mechanics is raw can be reduced, dispersed large, can not meet the requirement of structural design, cannot bring into play carbon fibre reinforcement high-performance advantage, having caused like this large-tow carbon fiber to widely apply still has any problem.

Break through low cost large-tow carbon fiber performance high-performance advantage key technology and develop exactly large-tow carbon fiber expansion technique, this can be avoided the generation of this type of defect to a great extent.If it is enough wide that large-tow carbon fiber launches, such as traditional 50K carbon fiber is 6mm, more than utilizing carbon fiber expansion technique to 4 times, can be more frivolous than the little tow 12K of tradition carbon fiber, make the more low-cost and high-performance large-tow carbon fiber composite of lightweight.

At present, mainly adopt mechanical multiple-roll mode around large-tow carbon fiber expanding unit, by roller roll extrusion, swing or vertical tremor mode is drawn thin by fibre bundle broadening, launch effect by controlling vibration amplitude, but spreading width is limited, twice at the most, easily cause carbon fiber to fracture, and vibration frequency is restricted if strengthen vibration amplitude.

Summary of the invention

The purpose of this utility model be to provide a kind of can be effectively by the equipment of large-tow carbon fiber Shu Zhankai.

In order to achieve the above object, the technical solution of the utility model has been to provide a kind of sonic method large-tow carbon fiber expanding unit that combines with mechanical multiple roll cylinder method, comprise the yarn feeding device of putting for placing fibre bundle, it is characterized in that: fibre bundle enters tenslator from putting after yarn feeding device is drawn, by the surface tension of tenslator control fibre bundle and ensure constant tension, the good fibre bundle of tension adjustment between mip rolls and the second backing roll by be introduced into preview yarn feeding device, adopt sound wave to expand fine method by fibre bundle pre-deployment by preview yarn feeding device, fibre bundle after pre-deployment is introduced into main exhibition yarn feeding device, adopting mechanical multiple roll cylinder to expand fine method by main exhibition yarn feeding device launches fibre bundle, fibre bundle after expansion is by the rolling of tractive wrap-up.

Preferably, described tenslator comprises the tension stability roller between the first guide roller and the first backing roll, fibre bundle is pile warp the first guide roller, tension stability roller and the first backing roll successively, on tension stability roller, hang with weight, adjust the position of tension stability roller by changing the weight of weight, above tension stability roller and below be separately installed with for detection of the upper limit position sensor of its upper limit position and detect the lower position sensor of its lower position.

Preferably, by the capillary step of described tenslator control fibre bundle be:

By changing the weight of described weight, make described tension stability roller under its Action of Gravity Field, have different displacements, thereby change the distance between described the first guide roller and described tension stability roller and between described tension stability roller and described support stick, thereby change fibre bundle surface cornerite and tensioning degree, reach and control the capillary object of fibre bundle.

Preferably, ensure that by described tenslator the step of constant tension is:

When the tension force of the fibre bundle in advancing increases, described tension stability rod moves up, and tension force is while reducing, moves down; In the time that described tension stability roller arrives its upper limit position, described upper limit position sensor such position detected and this consequential signal is fed back to described in put yarn feeding device, increase and put yarn rotary speed, supply with and described tension stability rod is declined to increase fibre bundle; In the time that described tension stability rod arrives its lower position, described lower position sensor such position detected and this consequential signal is fed back to described in put yarn feeding device, make described tension stability roller increase to reduce the supply of fibre bundle, the tension force of fibre bundle always keeps constant like this.

Preferably, described preview yarn feeding device comprises low-frequency generator, power amplifier, loudspeaker, the first exhibition yarn roller and the second exhibition yarn roller, low-frequency generator is connected with power amplifier, power amplifier connects loudspeaker, the first exhibition yarn roller and the second exhibition yarn roller are arranged near the outlet sound mouth of loudspeaker, and fibre bundle successively pile warp first enters described main exhibition yarn feeding device after opening up yarn roller and the second exhibition yarn roller.

Preferably, described preview yarn feeding device by the step of fibre bundle pre-deployment is:

Utilize the electromagnetic induction principle of described low-frequency generator, a part of conductor of energising is done to the cutting magnetic induction line sensor current signal changing that moves in magnetic field, by described power amplifier, sensor current signal is amplified, then the electric current changing passes through coil, the magnetic field changing, thus allow the diaphragm of described loudspeaker vibrate, cause the concussion of ambient air, make and then constantly vibration of fibre bundle by air concussion, fibre bundle is launched.

Preferably, described low-frequency generator is to work under alternating voltage, adopts the form of frequency conversion or transformation; The low-frequency generator optional frequency of frequency conversion form is selected scope 20-50Hz; The low-frequency generator voltage selectable range of transformation form is 4-12V; Loudspeaker is contained in the glued board of sealing, produces sound wave scope at 80-130dB; The surface of the first exhibition yarn roller and the second exhibition yarn roller is through too high polishing.

Preferably, described main exhibition yarn feeding device comprises the swing arm swinging, the vibration rod moving up and down, elevating lever and fixed bar, and fibre bundle is with S shape successively pile warp swing arm, the vibration rod moving up and down, elevating lever and fixed bar.

Preferably, the step that described main exhibition yarn feeding device launches fibre bundle is:

Applied the pulling force of horizontal direction to fibre bundle by described swing arm, applied the pulling force of vertical direction simultaneously to fibre bundle by described vibration rod, thereby make that fibre bundle is widened, attenuation, described vibration rod, in vibrations process, during away from adjacent swing arm and elevating lever, can be subject to adverse effect power, fibre bundle can pull open up and down under vibration rod effect, in the time of the swing arm near adjacent and elevating lever, the fibre bundle being elongated can be shaken loose, to reach required width; Change elevating lever upper-lower position, changed the distance between elevating lever and fixed bar, therefore change tensioning and the cornerite of carbon fiber, effect is paved in the expansion of Stable Carbon fiber.

The equipment that the utility model provides can effectively fully launch large-tow carbon fiber.Tenslator can be controlled fibre bundle and keep constant tension; In large-tow carbon fiber expansion process, utilize sound wave to expand fine method and mechanical multiple roll cylinder expands the mode that fine method combines, can make fibre bundle fully launch; For making fibre bundle avoid scattering because shake is shaken fibre bundle in pre-deployment process, utilizing sound wave to expand in fine method expansion process, add a pair of exhibition yarn roller, can pave along vibration rod surface uniform like this, effect is paved in the expansion of Stable Carbon fiber; Further, main exhibition yarn adopts mechanical multiple roll cylinder exhibition yarn mode, makes the full and uniform expansion of fibre bundle, 4 times of the large original fibre bundle of tow spreading width.This technique can make tow extension width wide, do not rise or few fluffing, good stability, the fibre bundle extends parallel after broadening, between fiber, intersect little, the advantage such as the composite void content that makes is low.

Brief description of the drawings

Combine with the mechanical multiple roll cylinder method structural representation of large-tow carbon fiber expanding unit of a kind of sonic method that Fig. 1 provides for the utility model.

Detailed description of the invention

For the utility model is become apparent, hereby with preferred embodiment, and coordinate accompanying drawing to be described in detail below.

In conjunction with Fig. 1, a kind of sonic method that the utility model provides large-tow carbon fiber expanding unit that combines with mechanical multiple roll cylinder method utilizes sound wave to expand fine method and mechanical multiple roll cylinder to expand the mode that fine method combines and launch large-tow carbon fiber system, what comprise that creel 1 for placing silvalin cylinder forms puts yarn feeding device 10, fibre bundle is wrapped on silvalin cylinder, and fibre bundle is imported into tenslator 20 through the first guide roller 2.1 after being drawn by creel 1.

Tenslator 20, by regulating the position of the tension stability rod 3 between the first guide roller 2.1 and the first support stick 6.1, is adjusted fibre bundle surface tension.Tension stability roller 3 positions are to be determined by the quality that hangs over weight 4 above it, by changing weight 4 weight, can make tension stability roller 3 under its Action of Gravity Field, have different displacements, change the distance between the first guide roller 2.1 and tension stability roller 3 and between tension stability roller 3 and the first support stick 6.1, therefore change fibre bundle surface cornerite and tensioning degree, so just can control fiber surface tension force.Simultaneously in order to ensure fibre bundle constant tension, above tension stability roller 3, below install respectively for detection of the upper limit position sensor 5.1 of its upper limit position with for detection of the lower position sensor 5.2 of its lower position.Implementation, when the tension force of the fibre bundle in advancing increases, tension stability rod 3 moves up, and tension force is while reducing, moves down.But in the time that tension stability roller 3 arrives its upper limit position, upper limit position sensor 5.1 detects such position and this consequential signal is fed back to and puts yarn feeding device 10, increase and put yarn rotary speed, supply with and tension stability rod 3 is declined to increase fibre bundle.On the contrary, in the time that tension stability rod 3 arrives its lower position, lower position sensor 5.2 detects such position and this consequential signal is fed back to and puts yarn feeding device 10, makes tension stability roller 3 increase to reduce the supply of fibre bundle, and fibre bundle tension force always keeps constant like this.

Fibre bundle good tension adjustment is passed through between mip rolls 7 and the second backing roll 6.2.Mip rolls direction of rotation is consistent with fibre bundle feeding direction, is one direction rotation, to prevent that fibre bundle is pulled.

Fibre bundle is introduced preview yarn feeding device 30 by the second guide roller 2.2.Preview yarn feeding device 30 is sound wave fiber-expanding machine, utilizes the sound wave of low frequency in gas medium, to vibrate tow, and tow is launched.This device is made up of low-frequency generator 8, power amplifier 9, loudspeaker 11, the first exhibition yarn roller 12.1, the second exhibition yarn roller 12.2.First utilize the electromagnetic induction principle of low-frequency generator 8, a part of conductor of energising is done to the cutting magnetic induction line induced-current changing that moves in magnetic field, power amplifier 9 amplifies the signal of telecommunication, then the electric current changing passes through coil, the magnetic field changing, thus allow the diaphragm of loudspeaker 11 vibrate, cause the concussion of ambient air, make and then constantly vibration of fibre bundle by air concussion, fibre bundle is launched.Briefly, mechanical energy is converted into electric energy by low-frequency generator 8, and power amplifier 9 amplifies this signal of telecommunication, and loudspeaker 11 is exactly that the signal of telecommunication is converted into sound wave release, and sound wave causes oxygen diffusion and vibration, by air vibration fibre bundle, fibre bundle is launched.The first exhibition yarn roller 12.1 and the second exhibition yarn roller 12.2 effects are on fibre bundle, to have suitable tension force in order to make, and prevent that the vertical hunting of fiber from reducing the damage of fiber.The resistance of loudspeaker 11 is that 8 ohm, power are 100 watts.Low-frequency generator 8 is to work under alternating voltage, adopts the form of frequency conversion or transformation.Frequency conversion form low-frequency generator 8 optional frequencies are selected scope 20-50Hz.Transformation form low-frequency generator 8 voltage selectable ranges are 4-12V.Loudspeaker 11 is contained in the glued board of sealing, produces sound wave scope at 80-130dB.The surface of the first exhibition yarn roller 12.1 and the second exhibition yarn roller 12.2 is through too high polishing.

Pre-deployment fibre bundle is introduced into main exhibition yarn feeding device 40.Main exhibition yarn feeding device 40 utilizes and between mechanical multiple-roll, interacts fibre bundle expansion and disperse.It is made up of the vibration rod 14 moving up and down on a swing arm swinging 13,, an elevating lever 15 and a fixed bar 16.Vibration rod 14, elevating lever 15 and fixed bar 16 that mass of fibers is walked around to swing arm 13, moved up and down with S shape.Applied the pulling force of horizontal direction to fibre bundle by swing arm 13, applied the pulling force of vertical direction simultaneously to fibre bundle by vibration rod 14, thereby make that fibre bundle is widened, attenuation, vibration rod 14, in vertical tremor process, in the time of the swing arm 13 deviating from and elevating lever 15 direction motion, can be subject to adverse effect power, fibre bundle can pull open up and down under vibration rod 14 effects, when near adjacent swing arm 13 and elevating lever 15 direction motion, the fibre bundle being elongated can be shaken loose, to reach required width.Change elevating lever 15 upper-lower positions, changed the distance between elevating lever 15 and fixed bar 16, therefore change tensioning and the cornerite of carbon fiber, effect is paved in the expansion of Stable Carbon fiber.

Last fibre bundle is by tractive wrap-up 50.In tractive crimping device 50, fibre bundle passes through in the middle of the first pulling roll 17.1 and the second pulling roll 17.2, launches fibre bundle and advances with stabilized speed, and fibre bundle surface tension is consistent like this.The first pulling roll 17.1 and the second pulling roll 17.2 surfaces are by silicon rubber.Fibre bundle through tractive district is finally received 18 rollings of yarn cylinder.

Claims (9)

1. the sonic method large-tow carbon fiber expanding unit that combines with mechanical multiple roll cylinder method, comprise and put yarn feeding device (10) for what place fibre bundle, it is characterized in that: fibre bundle enters tenslator (20) from putting after yarn feeding device (10) is drawn, control the surface tension of fibre bundle and ensure constant tension by tenslator (20), the good fibre bundle of tension adjustment between mip rolls (7) and the second backing roll (6.2) by be introduced into preview yarn feeding device (30), adopt sound wave to expand fine method by fibre bundle pre-deployment by preview yarn feeding device (30), fibre bundle after pre-deployment is introduced into main exhibition yarn feeding device (40), adopting mechanical multiple roll cylinder to expand fine method by main exhibition yarn feeding device (40) launches fibre bundle, fibre bundle after expansion is by tractive wrap-up (50) rolling.
2. a kind of sonic method as claimed in claim 1 large-tow carbon fiber expanding unit that combines with mechanical multiple roll cylinder method, it is characterized in that: described tenslator (20) comprises the tension stability roller (3) being positioned between the first guide roller (2.1) and the first backing roll (6.1), fibre bundle is pile warp the first guide roller (2.1) successively, tension stability roller (3) and the first backing roll (6.1), on tension stability roller (3), hang with weight (4), adjust the position of tension stability roller (3) by changing the weight of weight (4), in the top of tension stability roller (3) and below be separately installed with for detection of the upper limit position sensor (5.1) of its upper limit position and detect the lower position sensor (5.2) of its lower position.
3. a kind of sonic method as claimed in claim 2 large-tow carbon fiber expanding unit that combines with mechanical multiple roll cylinder method, is characterized in that: the capillary step of controlling fibre bundle by described tenslator (20) is:
By changing the weight of described weight (4), make described tension stability roller (3) under its Action of Gravity Field, have different displacements, thereby change the distance between described the first guide roller (2.1) and described tension stability roller (3) and between described tension stability roller (3) and described the first backing roll (6.1), thereby change fibre bundle surface cornerite and tensioning degree, reach and control the capillary object of fibre bundle.
4. a kind of sonic method as claimed in claim 2 large-tow carbon fiber expanding unit that combines with mechanical multiple roll cylinder method, is characterized in that: the step that ensures constant tension by described tenslator (20) is:
When the tension force of the fibre bundle in advancing increases, described tension stability roller (3) moves up, and tension force is while reducing, moves down; In the time that described tension stability roller (3) arrives its upper limit position, described upper limit position sensor (5.1) such position detected and this consequential signal is fed back to described in put yarn feeding device (10), increase and put yarn rotary speed, supply with and described tension stability roller (3) is declined to increase fibre bundle; In the time that described tension stability roller (3) arrives its lower position, described lower position sensor (5.2) such position detected and this consequential signal is fed back to described in put yarn feeding device (10), make described tension stability roller (3) increase to reduce the supply of fibre bundle, the tension force of fibre bundle always keeps constant like this.
5. a kind of sonic method as claimed in claim 1 large-tow carbon fiber expanding unit that combines with mechanical multiple roll cylinder method, it is characterized in that: described preview yarn feeding device (30) comprises low-frequency generator (8), power amplifier (9), loudspeaker (11), the first exhibition yarn roller (12.1) and the second exhibition yarn roller (12.2), low-frequency generator (8) is connected with power amplifier (9), power amplifier (9) connects loudspeaker (11), the first exhibition yarn roller (12.1) and the second exhibition yarn roller (12.2) are arranged near the outlet sound mouth of loudspeaker (11), fibre bundle successively pile warp first enters described main exhibition yarn feeding device (40) after opening up yarn roller (12.1) and the second exhibition yarn roller (12.2).
6. a kind of sonic method as claimed in claim 5 large-tow carbon fiber expanding unit that combines with mechanical multiple roll cylinder method, is characterized in that: described preview yarn feeding device (30) by the step of fibre bundle pre-deployment is:
Utilize the electromagnetic induction principle of described low-frequency generator (8), a part of conductor of energising is done to the cutting magnetic induction line sensor current signal changing that moves in magnetic field, by described power amplifier (9), sensor current signal is amplified, then the electric current changing passes through coil, the magnetic field changing, thereby allow the diaphragm of described loudspeaker (11) vibrate, cause the concussion of ambient air, make and then constantly vibration of fibre bundle by air concussion, fibre bundle is launched.
7. a kind of sonic method as claimed in claim 5 large-tow carbon fiber expanding unit that combines with mechanical multiple roll cylinder method, is characterized in that: described low-frequency generator (8) is to work under alternating voltage, adopts the form of frequency conversion or transformation; Low-frequency generator (8) optional frequency of frequency conversion form is selected scope 20-50Hz; Low-frequency generator (8) the voltage selectable range of transformation form is 4-12V; Loudspeaker (11) is contained in the glued board of sealing, produces sound wave scope at 80-130dB; The surface of the first exhibition yarn roller (12.1) and the second exhibition yarn roller (12.2) is through too high polishing.
8. a kind of sonic method as claimed in claim 1 large-tow carbon fiber expanding unit that combines with mechanical multiple roll cylinder method, it is characterized in that: described main exhibition yarn feeding device (40) comprises the swing arm (13) swinging, the vibration rod (14) moving up and down, elevating lever (15) and fixed bar (16), fibre bundle is with S shape successively pile warp swing arm (13), the vibration rod (14) moving up and down, elevating lever (15) and fixed bar (16).
9. a kind of sonic method as claimed in claim 8 large-tow carbon fiber expanding unit that combines with mechanical multiple roll cylinder method, is characterized in that: the step that described main exhibition yarn feeding device (40) launches fibre bundle is:
Applied the pulling force of horizontal direction to fibre bundle by described swing arm (13), applied the pulling force of vertical direction to fibre bundle by described vibration rod (14) simultaneously, thereby fibre bundle is widened, attenuation, described vibration rod (14) is in vibrations process, during away from adjacent swing arm (13) and elevating lever (15), can be subject to adverse effect power, fibre bundle can pull open up and down under vibration rod (14) effect, in the time of the swing arm (13) near adjacent and elevating lever (15), the fibre bundle being elongated can be shaken loose, to reach required width, change elevating lever (15) upper-lower position, changed the distance between elevating lever (15) and fixed bar (16), therefore change tensioning and the cornerite of carbon fiber, effect is paved in the expansion of Stable Carbon fiber.
CN201420038417.2U 2014-01-22 2014-01-22 Large tow carbon fiber unwinding device combining sound wave method and mechanical multiple-roller method CN203729004U (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103757784A (en) * 2014-01-22 2014-04-30 东华大学 Device for spreading large-tow carbon fibers through combination of sound wave method and mechanical multi-roller method
CN105000428A (en) * 2015-07-15 2015-10-28 北京昂林贸烽科技有限公司 Equipment and technological method for expansion of fiber bundles
CN105155073A (en) * 2015-10-16 2015-12-16 北京合力星新材料技术有限公司 Carbon fiber expanding device
CN106426982A (en) * 2016-11-02 2017-02-22 上海复合材料科技有限公司 Spinning nozzle structure for wet molding process of prepreg and using method thereof
CN106676725A (en) * 2016-12-30 2017-05-17 上海晋飞复合材料科技有限公司 Zero-twist feeding system for flattened wefts of weaving
CN107144575A (en) * 2017-04-28 2017-09-08 宁波韵升智能技术有限公司 A kind of banding coiled strip defect automatic checkout equipment

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103757784A (en) * 2014-01-22 2014-04-30 东华大学 Device for spreading large-tow carbon fibers through combination of sound wave method and mechanical multi-roller method
CN105000428A (en) * 2015-07-15 2015-10-28 北京昂林贸烽科技有限公司 Equipment and technological method for expansion of fiber bundles
CN105155073A (en) * 2015-10-16 2015-12-16 北京合力星新材料技术有限公司 Carbon fiber expanding device
CN105155073B (en) * 2015-10-16 2017-09-26 北京合力星新材料技术有限公司 Carbon fiber expanding unit
CN106426982A (en) * 2016-11-02 2017-02-22 上海复合材料科技有限公司 Spinning nozzle structure for wet molding process of prepreg and using method thereof
CN106426982B (en) * 2016-11-02 2019-09-17 上海复合材料科技有限公司 Silk mouth structure and its application method for wet forming prepreg
CN106676725A (en) * 2016-12-30 2017-05-17 上海晋飞复合材料科技有限公司 Zero-twist feeding system for flattened wefts of weaving
CN106676725B (en) * 2016-12-30 2018-07-20 上海晋飞复合材料科技有限公司 Non-twist feeding system for woven flattening weft yarn
CN107144575A (en) * 2017-04-28 2017-09-08 宁波韵升智能技术有限公司 A kind of banding coiled strip defect automatic checkout equipment

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