CN114457609B - Head box for special fiber and fiber dispersing method using head box - Google Patents
Head box for special fiber and fiber dispersing method using head box Download PDFInfo
- Publication number
- CN114457609B CN114457609B CN202210055215.8A CN202210055215A CN114457609B CN 114457609 B CN114457609 B CN 114457609B CN 202210055215 A CN202210055215 A CN 202210055215A CN 114457609 B CN114457609 B CN 114457609B
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- box body
- swinging
- fiber
- supporting seat
- slurry
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- 239000000835 fiber Substances 0.000 title claims abstract description 115
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000002002 slurry Substances 0.000 claims description 76
- 230000007246 mechanism Effects 0.000 claims description 46
- 239000007788 liquid Substances 0.000 claims description 14
- 230000005540 biological transmission Effects 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 10
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 9
- 239000004917 carbon fiber Substances 0.000 claims description 9
- 239000006185 dispersion Substances 0.000 claims description 9
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 9
- 229920002239 polyacrylonitrile Polymers 0.000 claims description 9
- -1 polypropylene Polymers 0.000 claims description 8
- 230000009471 action Effects 0.000 claims description 7
- 239000002270 dispersing agent Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 230000000903 blocking effect Effects 0.000 claims description 5
- 239000004744 fabric Substances 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 238000005054 agglomeration Methods 0.000 claims description 4
- 230000002776 aggregation Effects 0.000 claims description 4
- 229920002748 Basalt fiber Polymers 0.000 claims description 3
- LQLQDKBJAIILIQ-UHFFFAOYSA-N Dibutyl terephthalate Chemical compound CCCCOC(=O)C1=CC=C(C(=O)OCCCC)C=C1 LQLQDKBJAIILIQ-UHFFFAOYSA-N 0.000 claims description 3
- 239000004952 Polyamide Substances 0.000 claims description 3
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 239000004734 Polyphenylene sulfide Substances 0.000 claims description 3
- 239000004743 Polypropylene Substances 0.000 claims description 3
- 230000016615 flocculation Effects 0.000 claims description 3
- 238000005189 flocculation Methods 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims description 3
- 229920002647 polyamide Polymers 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 229920000069 polyphenylene sulfide Polymers 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 239000002243 precursor Substances 0.000 claims description 3
- 239000004627 regenerated cellulose Substances 0.000 claims description 3
- 239000010426 asphalt Substances 0.000 claims description 2
- ONIHPYYWNBVMID-UHFFFAOYSA-N diethyl benzene-1,4-dicarboxylate Chemical compound CCOC(=O)C1=CC=C(C(=O)OCC)C=C1 ONIHPYYWNBVMID-UHFFFAOYSA-N 0.000 claims 1
- 230000008569 process Effects 0.000 description 11
- 230000006872 improvement Effects 0.000 description 9
- 230000001276 controlling effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000033001 locomotion Effects 0.000 description 3
- 230000000737 periodic effect Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 229920001131 Pulp (paper) Polymers 0.000 description 2
- 229920002522 Wood fibre Polymers 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 238000010907 mechanical stirring Methods 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 239000002025 wood fiber Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/02—Head boxes of Fourdrinier machines
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/06—Regulating pulp flow
Landscapes
- Paper (AREA)
Abstract
The invention relates to the field of special fiber papermaking, and particularly discloses a pulp flowing box body for special fibers and a method for dispersing fibers by using the pulp flowing box body.
Description
Technical Field
The invention relates to the field of special fiber papermaking, in particular to a head box for special fibers and a method for dispersing fibers by using the head box.
Background
Because of the different properties of specialty fibers from wood fibers in the specialty fiber papermaking field, specialty fibers tend to be more difficult to disperse and agglomerate than wood fibers. The slurry is stable in spraying at the head box to achieve the aim of coordinating the slurry speed with the net speed, so that the flow speed and the flow rate of the slurry flowing from the central distributor or the cone distributor to the head box must be regulated and controlled through the weir plate or the lip, and the blocking regulation and control can naturally slow the flow speed of the slurry at the head box to generate dead space with low flow or no flow at the right-angle side or the slurry inlet side of the head box. Special fibers are easy to agglomerate in the dead angles and dead areas so as to influence the distribution of the slurry on a paper machine, and the paper surface is uneven and even broken, caking, broken or broken ends are caused in the paper forming process.
In the prior art, aiming at the problem that a headbox generates dead space with low flow or no flow, two treatment methods in the traditional papermaking industry are as follows: one is to add a mechanical stirring mechanism of a homogenizing roller type into a box body (see patent CN211772402U; CN 212077483U); the other is to add an ultrasonic device to the box (CN 211395175U). The two methods have obvious defects for special fiber papermaking. The mechanical stirring mechanism of the homogenizing roller is characterized in that special fibers, especially long fibers, can be wound with the rotating mechanism in the stirring process, the homogenizing roller has side gaps, the fibers can be agglomerated in the side gaps, the continuously rotating homogenizing roller can form paper surface waves when forming paper, air bubbles are easily generated when the liquid level turns over in the stirring process, the fibers can be agglomerated at the air bubbles, and the tiny air bubbles are attached to the surfaces of the fibers and can generate defects when forming paper. The ultrasonic device has an influence on the papermaking process requiring disordered arrangement of special fiber papermaking, particularly paper forming fibers, because the fibers can generate ordered arrangement along with the waves under the action of ultrasonic waves to destroy the process requirement.
Therefore, there is a need in the art of specialty fiber papermaking for a specialty fiber headbox that can better conform to the specialty fiber papermaking process and a method of dispersing fibers using the same.
Disclosure of Invention
In order to solve the problem of dead space of a flowing or non-flowing dead zone of a low-flow box in the field of special fiber papermaking in the prior art, the invention provides a special fiber-used flow box body and a fiber dispersing method by using the special fiber-used flow box body.
The invention provides a special fiber headbox body for realizing the purpose of the invention, which comprises a swinging box body, wherein the rear end of the swinging box body is communicated with a buffer box body, and the rear end of the buffer box body is communicated with a pulp distribution box body; the swinging box body comprises a front supporting seat, a rear supporting seat and an arc swinging body, wherein the arc swinging body is arranged between the front supporting seat and the rear supporting seat, the front supporting seat, the rear supporting seat and the arc swinging body form a swinging cavity, two ends of the arc swinging body are connected with the front supporting seat and the rear supporting seat through rotary sealing strips, the bottom of the arc swinging body is in rolling connection with the front supporting seat and the rear supporting seat, the front end of the front supporting seat is connected with a plurality of distribution pipes, the distribution pipes are communicated with the swinging cavity, and the arc swinging body is connected with a transmission mechanism; the back supporting seat is connected with one end of the buffer box body, the swing cavity is communicated with the buffer box body, a first opening adjusting mechanism is arranged between the back supporting seat and the buffer box body and used for adjusting and controlling the slurry flow and the flow speed of the swing cavity and the buffer box body, the other end of the buffer box body is communicated with the pulp distribution box body, a second opening adjusting mechanism is arranged at the tail end of the pulp distribution box body and used for adjusting and controlling the slurry outlet flow and the flow speed of the pulp distribution box body.
As a further improvement of the scheme, the swing cavity is in a fan-shaped cylinder shape, the upper ends of the front support seat and the rear support seat are provided with arc slide ways capable of enabling the arc swing body to slide on the arc surfaces, the front support seat and the rear support seat are provided with mounting groove bodies corresponding to the arc swing bodies, carrier rollers are arranged in the mounting groove bodies and are in rolling connection with the bottoms of the arc swing bodies, balls are further arranged between the arc swing bodies and the front support seat and between the arc swing bodies and the rear support seat, the transmission mechanism comprises a first variable frequency motor, the output end of the first variable frequency motor is fixedly connected with a first screw rod, and racks which can be in transmission connection with the first screw rod are arranged at the bottoms of the arc swing bodies.
As a further improvement of the scheme, the first opening adjusting mechanism comprises a weir plate, the side end of the weir plate is in sliding connection with a rear supporting seat, a weir bar is arranged on the rear supporting seat corresponding to the weir plate, a first driving mechanism for driving the weir plate to lift is arranged on the rear supporting seat, the first driving mechanism comprises a second variable frequency motor arranged on the rear supporting seat, the output end of the second variable frequency motor is fixedly connected with a first gear, the first gear is in meshed connection with a second gear, the second gear is fixedly connected with a second screw rod, a first accommodating groove capable of accommodating the second screw rod is formed in the weir plate, and the upper port of the first accommodating groove is a first threaded port capable of being in threaded connection with the second screw rod; the distance between the two side plates of the buffer box body is gradually reduced from the rear supporting seat to the pulp distribution box body, and the bottom plate of the buffer box body is an arc-shaped plate and is connected to the pulp distribution box body obliquely downwards; the bottom plate of the pulp distribution box body is an arc-shaped plate, the front end of the bottom plate of the pulp distribution box body is in seamless connection with the rear end of the bottom plate of the buffer box body, the bottom plate of the pulp distribution box body extends obliquely downwards, and the side plate of the buffer box body is in seamless connection with the side plate of the pulp distribution box body at the corresponding side; the second opening adjusting mechanism comprises a lifting plate, the side end of the lifting plate is in sliding connection with the side wall of the pulp distribution box body, the lower end of the lifting plate is connected with a lip plate, a second driving mechanism for driving the lifting plate to lift is installed on the pulp distribution box body, the second driving mechanism comprises a third variable frequency motor installed on the pulp distribution box body, the third variable frequency motor is connected with an electromagnetic flowmeter through a PLC, the output end of the third variable frequency motor is fixedly connected with a third gear, the third gear is in meshed connection with a fourth gear, the fourth gear is fixedly connected with a third screw rod, a second accommodating groove capable of accommodating the third screw rod is formed in the lifting plate, and a second threaded port capable of being in threaded connection with the third screw rod is formed in the upper end of the second accommodating groove.
As a further improvement of the scheme, the distribution pipes are distributed in an arc shape, and the position of the distribution pipe with the highest distribution is lower than the lowest swinging point of the arc swinging body.
As a further improvement of the scheme, a plurality of protruding structures are distributed on the arc surface of the inner wall of the arc swinging body, and an ultrasonic vibration plate is arranged in the arc swinging body.
As a further improvement of the scheme, the protruding structures can be hemispheric, the protruding structures are alternately distributed, and the adjacent interval distance ranges from 1mm to 500mm.
The invention provides a method for dispersing fibers by utilizing a head box body for special fibers, which comprises the following specific steps:
step 1: preparing special fiber slurry: adding special fiber, a dispersing agent and solvent water into a batching tank according to a proportion, stirring, mixing and uniformly dispersing to prepare special fiber slurry;
step 2: introduction of special fiber slurry: removing undispersed agglomerates from the special fiber slurry through a filter screen, and uniformly distributing the uniformly dispersed special fiber slurry into the swinging box body through a distribution pipe arranged in an arc manner;
step 3: dispersion of slurry in headbox: the slurry continuously collects liquid in the swing cavity under the blocking of the weir plate and the weir bar, and the flocculation and agglomeration caused by the orientation of the flow direction and the short residence of the liquid are counteracted under the action of the periodical swing of the circular arc swing body and the cooperation of the ultrasonic vibration plate and the convex structure, so that a good dispersion state is maintained;
step 4: the slurry in the dispersion state is controlled by a buffer box body and a slurry distribution box body under the regulation and control of a weir plate and a weir bar, the flow of the slurry liquid is controlled under the action of a lifting lip plate arranged on the slurry distribution box body, and finally, the slurry is uniformly paved on a forming net to form uniform special fiber paper.
As a further improvement of the scheme, in the step 1, the special fiber in the slurry is any one or more of long fiber or short fiber carbon fiber, polypropylene fiber, polyethylene fiber, glass fiber, basalt fiber, polyacrylonitrile fiber, polyphenylene sulfide fiber, dibutyl terephthalate fiber, polyethylene terephthalate fiber, polyamide fiber, polyacrylonitrile precursor fiber, polyacrylonitrile-based preoxidized fiber, pitch-based carbon fiber, regenerated cellulose-based carbon fiber and wood pulp fiber, the diameter of the fiber is 5 mu m-20 mu m, the fiber length is 3mm-12mm, and the feeding mass ratio is that of the fiber: dispersing agent: water = 1:0.1-10:2-200.
As a further improvement of the above scheme, the slurry flow rate in the step 2 is 200-1000L/hr.
As a further improvement of the scheme, in the step 3, the circular arc swinging body swings periodically, the swinging period is 1-50 times per minute, and the swinging amplitude is 168-8 times of arc length; in the step 3, the ultrasonic frequency of the ultrasonic vibration plate is controlled to be less than or equal to 3.4cm at a wavelength of 20 KHZ-80 KHZ.
The beneficial effects of the invention are as follows:
compared with the prior art, the invention has the following advantages:
1. the invention is provided with the arc swinging body, the front supporting seat and the rear supporting seat form a swinging cavity, a static right-angle side elevation does not exist in the swinging cavity, a right-angle dead zone caused by a static elevation structure is eliminated, in addition, the reciprocating swinging of the arc swinging body can drive slurry with slow flow speed at the bottom to play a role in homogenizing and maintaining the dispersibility of the slurry, the reciprocating frequency and amplitude of the arc swinging body can be adjusted along with the setting of the parameters of the first variable frequency motor, and the diversity of the process is ensured to be met by the equipment.
2. The inner wall arc surface of the arc swinging body is provided with protruding structures which are alternately distributed among rows, the protruding structures can be hemispherical, other shapes or other arrangement modes can be adopted according to the technological requirements, and the protruding structures can increase disturbance of the bottom to liquid and prevent slurry from settling or agglomerating.
3. An ultrasonic vibration plate is arranged in the interlayer of the arc swinging body, and the longitudinal vibration perpendicular to the arc surface is added to improve the anisotropy of the fiber.
4. The distribution pipes are arranged in an arc shape, so that uniformity of slurry flowing into the swing cavity is guaranteed, and slurry can not overflow in the swing process when the highest position is lower than the lowest swing point of the arc swing body.
5. And a weir plate and a weir bar are arranged between the swinging box body and the buffer box body, the opening positions of the weir plate and the weir bar are lower, and the slurry flows out from the middle lower part to weaken the fluctuation of the surface of the liquid level in the swinging cavity, and simultaneously, the flow rate and the flow velocity of the slurry which is about to reach the second opening regulating mechanism are regulated and controlled.
6. And the third variable frequency motor and the electromagnetic flowmeter are linked to control and adjust the opening degree by a PLC, so that the slurry is further accurately adjusted, and the slurry is ensured to be uniformly distributed on the forming net.
Drawings
The invention is described in further detail below with reference to the attached drawing figures, wherein:
FIG. 1 is a schematic view showing the external structure of a headbox for special fibers according to the present invention;
FIG. 2 is a schematic view of the internal structure of the headbox for specialty fibers according to the present invention;
FIG. 3 is a top view of a headbox for specialty fibers of the present invention;
fig. 4 is a schematic structural view of a carrier roller according to the present invention;
FIG. 5 is a schematic diagram of a transmission mechanism according to the present invention;
FIG. 6 is a schematic diagram of a first driving mechanism according to the present invention;
FIG. 7 is a schematic diagram of a second driving mechanism according to the present invention;
fig. 8 is a schematic view showing a state of the arc swinging body in swinging in the present invention;
fig. 9 is a schematic view showing another state of the swing body of the circular arc in the present invention.
In the figure: the device comprises a 1-swing box body, a 2-buffer box body, a 3-pulp distribution box body, a 4-front supporting seat, a 5-rear supporting seat, a 6-circular swing body, a 7-swing cavity, an 8-rotary sealing strip, a 9-distribution pipe, a 10-transmission mechanism, a 11-first opening adjusting mechanism, a 12-second opening adjusting mechanism, a 13-circular slideway, a 14-installation groove body, a 15-carrier roller, a 16-first variable frequency motor, a 17-first screw rod, a 18-rack, a 19-weir plate, a 20-weir bar, a 21-second variable frequency motor, a 22-first gear, a 23-second gear, a 24-second screw rod, a 25-swing box body, a 26-first accommodating groove, a 27-lifting plate, a 28-lip plate, a 29-second driving motor, a 30-third gear, a 31-fourth gear, a 32-third screw rod, a 33-second accommodating groove, a 34-second thread opening, a 35-protruding structure, a 36-ultrasonic vibration plate and a 37-ball.
Detailed Description
As shown in fig. 1-7, the special fiber headbox provided for achieving the purpose of the invention comprises a swinging box body 1, wherein the rear end of the swinging box body 1 is communicated with a buffer box body 2, and the rear end of the buffer box body 2 is communicated with a pulp distribution box body 3.
The swinging box body 1 comprises a front supporting seat 4, a rear supporting seat 5 and an arc swinging body 6, wherein the arc swinging body 6 is arranged between the front supporting seat 4 and the rear supporting seat 5, the relative positions of the front supporting seat 4 and the rear supporting seat 5 are fixed, the front supporting seat 4, the rear supporting seat 5 and the arc swinging body 6 form a swinging cavity 7, the swinging cavity 7 is in a fan-shaped cylinder shape and can also be changed into a cylinder shape according to the process, a right-angle side elevation is not arranged in the swinging cavity 7, a right-angle dead zone caused by the elevation structure is eliminated, the upper ends of the front supporting seat 4 and the rear supporting seat 5 are provided with arc slide ways 13 for the arc swinging body 6 to slide, the two ends of the arc swinging body 6 are connected with the front supporting seat 4 and the rear supporting seat 5 through rotary sealing strips 8, the rotary sealing strips 8 are rotary elastic sealing strips for providing sealing between rotary mechanical parts, the front supporting seat 4 and the rear supporting seat 5 are provided with mounting groove bodies 14 corresponding to the arc swinging body 6, a carrier roller 15 is arranged in the mounting groove body 14, the carrier roller 15 is in rolling connection with the bottom of the circular arc swinging body 6, a ball 37 is also arranged between the circular arc swinging body 6 and the front supporting seat 4 and between the circular arc swinging body 6 and the rear supporting seat 5, the circular arc swinging body 6 is connected with a transmission mechanism 10, the transmission mechanism 10 comprises a first variable frequency motor 16, the output end of the first variable frequency motor 16 is fixedly connected with a first screw rod 17, a rack 18 which can be in transmission connection with the first screw rod 17 is arranged at the bottom of the circular arc swinging body 6, the first variable frequency motor 16 is controlled by a frequency converter of the first variable frequency motor 16 to periodically rotate positively and negatively to drive the circular arc swinging body 6 to do periodic reciprocating motion, the circular arc swinging body 6 is reciprocated to drive slurry with slow flow velocity at the bottom to play a role of homogenate to maintain the dispersibility of the slurry, the reciprocating frequency and amplitude of the circular arc swinging body can be adjusted along with the parameter setting of the variable frequency motor of the first variable frequency motor 16, further, when the swing chamber 7 adopts a cylindrical shape, a rotation mechanism may be employed to realize the circular movement of the swing chamber 7.
The front end of the front supporting seat 4 is connected with a plurality of distribution pipes 9, the distribution pipes 9 are communicated with the swinging cavity 7, the distribution pipes 9 are distributed in an arc shape, the distribution pipes 9 are distributed along the center symmetrical edge of the arc direction, the distribution pipe 9 with the highest distribution is lower than the lowest swinging point of the arc swinging body 6, the uniformity of slurry flowing into the swinging cavity 7 is guaranteed due to the arc distribution of the distribution pipes 9, and slurry can not overflow in the swinging process due to the fact that the highest position is lower than the lowest swinging point of the arc swinging body 6.
The back supporting seat 5 is in sealing connection with one end of the buffer box body 2, the swinging cavity 7 is communicated with the buffer box body 2, a first opening adjusting mechanism 11 is arranged between the back supporting seat 5 and the buffer box body 2, the first opening adjusting mechanism 11 is used for adjusting and controlling the slurry flow and the flow rate of the swinging cavity 7 and the buffer box body 2, the first opening adjusting mechanism 11 comprises a weir plate 19, the weir plate 19 is arranged in the middle of the back supporting seat 5, the side end of the weir plate 19 is in sliding connection with the back supporting seat 5, a limiting chute capable of enabling the weir plate 19 to move up and down is arranged on the back supporting seat 5, a weir bar 20 is arranged on the back supporting seat 5 corresponding to the weir plate 19, a first driving mechanism used for driving the weir plate 19 to lift is arranged on the back supporting seat 5, the weir plate 19 is arranged to enable the swinging cavity 7 to accumulate slurry with a certain liquid level, the opening position of the weir plate 19 and the weir bar 20 is lower, the slurry flows out of the middle low part to weaken the fluctuation of the inner liquid level surface of the swinging cavity 7, meanwhile, the flow rate of the slurry to be reached to the position of the second opening adjusting mechanism 12 at the tail end of the pulp box body 3 is carried out, the first driving mechanism comprises a variable frequency motor 5, a variable frequency motor 21 is arranged on the back supporting motor, a variable frequency motor 21 is connected with a second variable frequency motor 21, a variable frequency motor is arranged on the first variable frequency motor 21 and a second variable frequency motor is connected with a second variable frequency screw 21 and a second variable frequency screw 21, a second variable frequency screw 24 is connected with a second variable frequency screw 25, a second variable frequency screw 25 is connected with a second variable frequency screw 25, a first variable frequency motor 25 is connected with a second variable frequency screw 21, a second variable frequency motor and a second variable frequency screw 21, a threaded speed control device is connected with a second variable frequency drive, and a second variable speed, and a speed, can.
The other end of the buffer box body 2 is communicated with the pulp distribution box body 3, the distance between the two side plates of the buffer box body 2 is gradually reduced from the rear supporting seat 5 to the pulp distribution box body 3, the bottom plate of the buffer box body 2 is an arc plate and is connected to the pulp distribution box body 3 obliquely downwards, the bottom plate of the pulp distribution box body 3 is an arc plate, the front end of the bottom plate of the pulp distribution box body 3 is seamlessly connected with the rear end of the bottom plate of the buffer box body 2, the bottom plate of the pulp distribution box body 3 extends obliquely downwards, the side plates of the buffer box body 2 are seamlessly connected with the side plates of the pulp distribution box body 3 at the corresponding side, the distance between the two side plates of the buffer box body 2 is gradually reduced, the arc bottom plate of the buffer box body 2 and the arc bottom plate of the pulp distribution box body 3 are gradually reduced, the pulp flowing through the weir plate 19 gradually reduces and flows to the pulp distribution box body 3 along the arc bottom plate in an unobstructed manner, the tail end of the pulp distribution box body 3 is provided with a second opening adjusting mechanism 12, the second opening adjusting mechanism 12 is used for adjusting and controlling the pulp outlet flow rate and the flow velocity of the pulp distribution box body 3, the second opening adjusting mechanism 12 comprises a lifting plate 27, the side end of the lifting plate 27 is in sliding connection with the side wall of the pulp distribution box body 3, the lower end of the lifting plate 27 is connected with a lip plate 28, the lip plate 28 and the tail end of the bottom plate of the pulp distribution box body 3 form a pulp distribution opening, the lip plate 28 and the pulp distribution box body 3 can be in sealing connection through a sealing strip, a second driving mechanism used for driving the lifting plate 27 to lift is arranged on the pulp distribution box body 3, the second driving mechanism comprises a third variable frequency motor 29 arranged on the pulp distribution box body 3, the third variable frequency motor 29 is connected with an electromagnetic flowmeter through a PLC, the output end of the third variable frequency motor 29 is fixedly connected with a third gear 30, the third gear 30 is in meshed connection with a fourth gear 31, the fourth gear 31 is fixedly connected with a third screw 32, a second containing groove 33 which can contain the third screw 32 is arranged in the lifting plate 27, the upper end of the second accommodating groove 33 is provided with a second threaded opening 34 which can be in threaded connection with the third screw rod 32, the third variable frequency motor 29 controls the lifting plate 27 and the lip plate 28 to be in lifting fit with the electromagnetic flowmeter linkage PLC to realize the adjustment of the opening of the pulp distribution opening, namely the opening between the lip plate and the arc-shaped bottom plate of the pulp distribution box body 3, and the pulp is uniformly distributed on the forming net.
Further improved, the ultrasonic vibration plate 36 is arranged in the circular arc swinging body 6, the ultrasonic vibration plate 36 can generate up-and-down vibration with adjustable frequency perpendicular to the circular arc inner wall of the circular arc swinging body 6, the anisotropy of fibers is improved, the ultrasonic frequency is adjustable, and the equipment is ensured to meet the process diversity.
Further improved, a plurality of protruding structures 35 are distributed on the arc surface of the inner wall of the arc swinging body 6, the protruding structures 35 can be hemispherical, the protruding structures 35 can be distributed at equal intervals or unequal intervals alternately, the adjacent interval distance ranges from 1mm to 500mm, the protruding structures 35 can also be in other shapes or other arrangement modes according to the technological requirements, and can also be in other shapes such as four-sided or three-sided conical shapes, trapezoidal shapes and the like, the protruding structures 35 can increase disturbance of the bottom to liquid, and slurry settlement or agglomeration is prevented.
The working principle of the headbox body for special fibers is as follows:
the slurry evenly distributes in the swinging cavity 7 through the distribution pipes 9, a certain depth is accumulated under the blocking of the weir plates 19 and the weir bars 20, the highest distribution pipe 9 is lower than the lowest swinging point of the circular arc swinging body 6, the first variable frequency motor 16 is driven to do periodic reciprocating motion towards the circular arc swinging body 6 by periodic forward rotation and reverse rotation under the control of the frequency converter of the first variable frequency motor 16, the circular arc swinging body 6 does reciprocating swinging along the circular arc slide ways 13 on the front supporting seat 4 and the rear supporting seat 5, the hemispherical convex structure 10 in the circular arc swinging body 6 follows the swinging, the ultrasonic vibration plate 36 arranged in the interlayer of the circular arc swinging body 6 generates longitudinal vibration perpendicular to the circular arc surface, the slurry of the base cloth is subjected to homogenizing treatment, the slurry subjected to continuous homogenizing treatment rapidly enters the buffer box body 2 through the opening gap between the weir plates 19 and the weir bars 20, the opening of the buffer box body 2 reaches the designated width, the opening of the lifting plate 27 and the lip plate 28 is controlled by the third variable frequency motor 29 to lift in cooperation with the electromagnetic flowmeter, the opening of the lip plate 28 is controlled to adjust the opening, namely the opening of the lip plate 28 and the slurry tank 3 is evenly distributed on the arc net.
The invention provides a method for dispersing fibers by utilizing a head box body for special fibers, which comprises the following specific steps:
step 1: preparing special fiber slurry: adding special fiber, a dispersing agent and solvent water into a batching tank according to a proportion, stirring, mixing and uniformly dispersing to prepare special fiber slurry;
step 2: introduction of special fiber slurry: removing undispersed agglomerates from the special fiber slurry through a filter screen, and uniformly distributing the uniformly dispersed special fiber slurry into the swinging box body 1 through a distributing pipe 9 which is arranged in an arc manner;
step 3: dispersion of slurry in headbox: the slurry continuously collects liquid in the swinging cavity 7 under the blocking of the weir plate 19 and the weir bar 20, and the flocculation and agglomeration caused by the orientation of the flowing direction and the short residence of the liquid are counteracted under the action of the periodical swinging of the circular arc swinging body 6 and the matching of the ultrasonic vibration plate 36 and the hemispherical convex structure 35, so that a good dispersion state is maintained;
step 4: the slurry in the dispersion state is controlled by a buffer box body 2 and a slurry distribution box body 3 under the regulation and control of a weir plate 19 and a weir bar 20, the flow of the slurry liquid is controlled under the action of a liftable lip 28 arranged on the slurry distribution box body 3, and finally, the slurry is uniformly paved on a forming net to form uniform special fiber paper.
In the step 1, the special fiber is any one or more of long fiber or short fiber carbon fiber, polypropylene fiber, polyethylene fiber, glass fiber, basalt fiber, polyacrylonitrile fiber, polyphenylene sulfide fiber, dibutyl terephthalate fiber, polyethylene terephthalate fiber, polyamide fiber, polyacrylonitrile precursor, polyacrylonitrile-based preoxidized fiber, asphalt-based carbon fiber, regenerated cellulose-based carbon fiber and wood pulp fiber, the diameter of the fiber is 5 mu m-20 mu m, the length of the fiber is 3mm-12mm, and the feeding mass ratio is that of the fiber: dispersing agent: water = 1:0.1-10:2-200.
Further improved, the flow rate of the slurry in the step 2 is 200-1000L/h.
Further improvement, in the step 3, the arc swinging body 6 swings periodically, the swinging period is 1-50 times per minute, and the swinging amplitude is 168-8 times of arc length; in the step 3, the ultrasonic frequency of the ultrasonic vibration plate 36 is controlled to be less than or equal to 3.4cm at a wavelength of 20 KHZ-80 KHZ.
The above embodiments are not limited to the technical solution of the embodiments, and the embodiments may be combined with each other to form a new embodiment. The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and any modifications or equivalent substitutions without departing from the spirit and scope of the present invention should be covered in the scope of the technical solution of the present invention.
Claims (6)
1. A head box for specialty fibers, characterized by: the device comprises a swinging box body (1), wherein the rear end of the swinging box body (1) is communicated with a buffer box body (2), and the rear end of the buffer box body (2) is communicated with a pulp distribution box body (3);
the swinging box body (1) comprises a front supporting seat (4), a rear supporting seat (5) and an arc swinging body (6), wherein the arc swinging body (6) is arranged between the front supporting seat (4) and the rear supporting seat (5), the front supporting seat (4), the rear supporting seat (5) and the arc swinging body (6) form a swinging cavity (7), two ends of the arc swinging body (6) are connected with the front supporting seat (4) and the rear supporting seat (5) through rotary sealing strips (8), the bottom of the arc swinging body (6) is in rolling connection with the front supporting seat (4) and the rear supporting seat (5), a plurality of distribution pipes (9) are connected at the front end of the front supporting seat (4), the distribution pipes (9) are communicated with the swinging cavity (7), the arc swinging body (6) is connected with a transmission mechanism (10), a plurality of protruding structures (35) are distributed on the arc surface of the inner wall of the arc swinging body (6), and an ultrasonic vibration plate (36) is arranged in the arc swinging body (6);
the device is characterized in that the rear supporting seat (5) is connected with one end of the buffer box body (2), the swing cavity (7) is communicated with the buffer box body (2), a first opening adjusting mechanism (11) is arranged between the rear supporting seat (5) and the buffer box body (2), the first opening adjusting mechanism (11) is used for adjusting and controlling the slurry flow and the flow velocity of the swing cavity (7) and the buffer box body (2), the other end of the buffer box body (2) is communicated with the slurry distribution box body (3), a second opening adjusting mechanism (12) is arranged at the tail end of the slurry distribution box body (3), and the second opening adjusting mechanism (12) is used for adjusting and controlling the slurry outlet flow and the slurry flow velocity of the slurry distribution box body (3);
the swing cavity (7) is in a fan-shaped cylinder shape, the upper ends of the front supporting seat (4) and the rear supporting seat (5) are provided with arc slide ways (13) which can enable the arc swinging bodies (6) to slide, the front supporting seat (4) and the rear supporting seat (5) are provided with mounting groove bodies (14) corresponding to the arc swinging bodies (6), carrier rollers (15) are arranged in the mounting groove bodies (14), the carrier rollers (15) are in rolling connection with the bottoms of the arc swinging bodies (6), balls (37) are further arranged between the arc swinging bodies (6) and the front supporting seat (4) and between the arc swinging bodies (5), the transmission mechanism (10) comprises a first variable frequency motor (16), the output ends of the first variable frequency motor (16) are fixedly connected with first screw rods (17), and racks (18) which can be in transmission connection with the first screw rods (17) are arranged at the bottoms of the arc swinging bodies (6).
The first opening adjusting mechanism (11) comprises a weir plate (19), the side end of the weir plate (19) is in sliding connection with a rear supporting seat (5), a weir bar (20) is arranged on the rear supporting seat (5) corresponding to the weir plate (19), a first driving mechanism for driving the weir plate (19) to lift is arranged on the rear supporting seat (5), the first driving mechanism comprises a second variable frequency motor (21) arranged on the rear supporting seat (5), the output end of the second variable frequency motor (21) is fixedly connected with a first gear (22), the first gear (22) is in meshed connection with a second gear (23), the second gear (23) is fixedly connected with a second screw (24), a first accommodating groove (25) capable of accommodating the second screw (24) is arranged in the weir plate (19), and the upper port of the first accommodating groove (25) is a first threaded port (26) which can be in threaded connection with the second screw (24);
the second opening adjusting mechanism (12) comprises a lifting plate (27), the side end of the lifting plate (27) is in sliding connection with the side wall of the pulp distribution box body (3), the lower end of the lifting plate (27) is connected with a lip plate (28), a second driving mechanism for driving the lifting plate (27) to lift is installed on the pulp distribution box body (3), the second driving mechanism comprises a third variable frequency motor (29) installed on the pulp distribution box body (3), the third variable frequency motor (29) is connected with an electromagnetic flowmeter through a PLC, the output end of the third variable frequency motor (29) is fixedly connected with a third gear (30), the third gear (30) is in meshed connection with a fourth gear (31), the fourth gear (31) is fixedly connected with a third screw (32), a second accommodating groove (33) capable of accommodating the third screw (32) is formed in the lifting plate (27), and a second thread opening (34) capable of being in threaded connection with the third screw (32) is formed in the upper end of the second accommodating groove (33);
the distance between the two side plates of the buffer box body (2) is gradually reduced from the rear supporting seat (5) to the pulp distribution box body (3), and the bottom plate of the buffer box body (2) is an arc-shaped plate and is connected to the pulp distribution box body (3) obliquely downwards;
the bottom plate of the cloth pulp box body (3) is an arc-shaped plate, the front end of the bottom plate of the cloth pulp box body (3) is in seamless connection with the rear end of the bottom plate of the buffer box body (2), the bottom plate of the cloth pulp box body (3) extends obliquely downwards, and the side plate of the buffer box body (2) is in seamless connection with the side plate of the cloth pulp box body (3) at the corresponding side.
2. A headbox for specialty fibers as set forth in claim 1, wherein: the distribution pipes (9) are distributed in an arc shape, and the position of the distribution pipe (9) with the highest distribution is lower than the lowest swinging point of the arc swinging body (6).
3. A headbox for specialty fibers as set forth in claim 1, wherein: the protruding structures (35) are hemispheric, the protruding structures (35) are distributed alternately, and the adjacent interval distance ranges from 1mm to 500mm.
4. A method of dispersing fibers using the headbox for specialty fibers as set forth in claim 3, characterized in that: the method is applied to dispersing special fibers, and comprises the following specific steps:
step 1: preparing special fiber slurry: adding special fiber, a dispersing agent and water into a batching tank according to a proportion, stirring, mixing and uniformly dispersing to prepare special fiber slurry;
step 2: introduction of special fiber slurry: removing undispersed agglomerates from the special fiber slurry through a filter screen, and uniformly distributing the uniformly dispersed special fiber slurry into the swinging box body (1) through a distribution pipe (9) arranged in an arc manner;
step 3: dispersion of slurry in headbox: the slurry continuously collects liquid in the swinging cavity (7) under the blocking of the weir plate (19) and the weir bar (20), flocculation and agglomeration caused by the flow direction orientation and short residence of the liquid are counteracted under the action of the periodical swinging of the circular arc swinging body (6) and the cooperation of the ultrasonic vibration plate (36) with the convex structure (35), a good dispersion state is maintained, the swinging period of the circular arc swinging body (6) is 1-50 times per minute, and the swinging amplitude is 168-8 times of arc length; the ultrasonic frequency of the ultrasonic vibration plate (36) is controlled to be 20 KHZ-80 KHZ, and the wavelength is less than or equal to 3.4cm;
step 4: the slurry in a dispersion state is controlled to flow out under the action of a lifting lip plate (28) arranged on the slurry distribution box body (3) through a buffer box body (2) and the slurry distribution box body (3) under the regulation and control of a weir plate (19) and a weir bar (20), and finally the slurry is uniformly paved on a forming net to form uniform special fiber paper.
5. The method of dispersing fibers of claim 4 wherein: in the step 1, the special fiber in the slurry is any one or more of long fiber or short fiber carbon fiber, polypropylene fiber, polyethylene fiber, glass fiber, basalt fiber, polyacrylonitrile fiber, polyphenylene sulfide fiber, dibutyl terephthalate fiber, diethyl terephthalate fiber, polyamide fiber, polyacrylonitrile precursor, polyacrylonitrile-based preoxidized fiber, asphalt-based carbon fiber and regenerated cellulose-based carbon fiber, the diameter of the special fiber is 5-20 mu m, the length of the special fiber is 3-12 mm, and the feeding mass ratio is the special fiber: dispersing agent: water = 1:0.1-10:2-200.
6. A method of dispersing fibers according to claim 5, characterized in that: the flow rate of the slurry in the step 2 is 200-1000 liters/hour.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210055215.8A CN114457609B (en) | 2022-01-18 | 2022-01-18 | Head box for special fiber and fiber dispersing method using head box |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210055215.8A CN114457609B (en) | 2022-01-18 | 2022-01-18 | Head box for special fiber and fiber dispersing method using head box |
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| CN114457609A CN114457609A (en) | 2022-05-10 |
| CN114457609B true CN114457609B (en) | 2024-02-27 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115012241A (en) * | 2022-07-25 | 2022-09-06 | 江南大学 | Inclined wire paper machine approach system with ultrasonic equipment |
| CN115590237A (en) * | 2022-09-16 | 2023-01-13 | 杭州富阳宏立机械制造有限公司（Cn） | Open thick-pulp tobacco flake shaper |
| CN115506168A (en) * | 2022-09-26 | 2022-12-23 | 湖南金博氢能科技有限公司 | Wet method fiber dispersing device |
| CN115627654A (en) * | 2022-10-26 | 2023-01-20 | 江南大学 | Inclined-wire stock discharge box with ultrasonic device and application thereof |
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