CN109505183B - Positive pressure flow box - Google Patents
Positive pressure flow box Download PDFInfo
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- CN109505183B CN109505183B CN201811639459.0A CN201811639459A CN109505183B CN 109505183 B CN109505183 B CN 109505183B CN 201811639459 A CN201811639459 A CN 201811639459A CN 109505183 B CN109505183 B CN 109505183B
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- box
- pulp
- thick liquid
- outlet
- positive pressure
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- 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
Abstract
The invention discloses a positive pressure headbox, which relates to the technical field of papermaking equipment; the key points of the technical scheme are as follows: including the box, set up into thick liquid mouth on the box, set up play thick liquid mouth, the rotation on the box and connect in the homogenate roller in the box, the box includes homogenate portion, set up in homogenate portion downstream side and rather than the connecting portion of intercommunication, set up in connecting portion downstream side and rather than the play thick liquid portion of intercommunication, set up and be used for the pump sending magma in the connecting portion and to its pressor pressurization portion, the play thick liquid mouth is seted up in the downstream side of play thick liquid portion and is close on the position of bottom, pressurization portion set up in inside the connecting portion. According to the invention, the pressurizing part, the connecting part and the buffer part are arranged in the pulp flowing box, so that the effect of ensuring that the pulp flowing box can discharge pulp quantitatively at a constant speed is achieved.
Description
Technical Field
The invention relates to the technical field of papermaking equipment, in particular to a positive pressure headbox.
Background
In the existing process of preparing base paper by using paper pulp, the paper pulp needs to be uniformly coated on mesh cloth and then dried to form base paper with certain width. In the process of uniform coating, a head box is used and is used for providing full-width and uniform slurry flow for the screen cloth, and the head box is required to meet the requirements of full-width isobaric constant speed on one hand and enable the slurry flow to be in a turbulent state on the other hand. In the prior art, the outflow of the pulp in a common pulp flowing box is realized by the action of the gravity of the pulp, and the device has the advantages of simple structure and poor pulp homogenizing effect and has the defects of large volume of the box body, large pulp flow turbulence scale and high pulp homogenizing effect.
Chinese patent with publication number CN202273133U and publication date 2012, 06, 13 discloses a positive pressure headbox, which is an improvement of the existing headbox. It includes the box, and one side of box is for advancing the thick liquid mouth, and the opposite side of box is out the thick liquid mouth, and just locates the installation cloth thick liquid ware at a thick liquid mouth, and the box is inside to be equipped with all thick liquid roller, and all thick liquid roller is by the motor drive in the box outside, a top cap is installed to the uncovered department of box, and box inside forms an inclosed cavity, still includes a fan, the fan link up through pipeline and the inside cavity of box. The invention increases a top cover and a blower to blow and pressurize the box body, so as to form positive pressure in the box body, thereby improving the flow equalizing effect of the slurry.
In actual use, the blower needs to be operated all the time, air supply for the cavity in the box body is maintained and pressurized, power consumption is high, and maintenance and use cost is high; in addition, the cavity pressure in the box body is related to the rotating speed of the blower, so that the control is inconvenient, a relatively stable pressure range cannot be maintained, the pressure is high and low, the outflow speed of the pulp primary pulp is unstable, and the thickness of the produced base paper is influenced.
Disclosure of Invention
It is an object of the present invention to provide a positive pressure headbox.
The technical purpose of the invention is realized by the following technical scheme: a positive pressure headbox comprising: the box, set up into thick liquid mouth on the box, set up the play thick liquid mouth and the rotation on the box and connect in the homogenate roller in the box, the box includes homogenate portion, set up in homogenate portion downstream side and rather than the connecting portion of intercommunication, set up in connecting portion downstream side and rather than the play thick liquid portion of intercommunication and set up and be used for the pump sending magma and to its pressor pressurization portion in connecting portion, the play thick liquid mouth is seted up in the downstream side of play thick liquid portion and is close on the position of bottom, pressurization portion set up in inside the connecting portion.
Through adopting above-mentioned technical scheme, the magma enters into in the homogenate portion from advancing the thick liquid mouth, and homogenate roller rotates and carries out the homogenate to the magma, makes the fibre wadding group in the homogenate fully break up and evenly distribute in the magma, then the magma enters into out the thick liquid portion through connecting portion in to the pressurization portion that is located connecting portion pressurizes the magma, makes its entering into out the thick liquid portion that has certain pressure, leaves the head box from a thick liquid mouth at last and accomplishes the head flow. The pressurization portion directly pressurizes magma, can guarantee the pressure stability of magma, makes the head box can the ration at the uniform velocity flow, effectively stabilizes the speed that the magma flows out, and then reaches the effect that does not influence the body paper thickness of production.
Further setting the following steps: the homogenate roller is in be equipped with the axis of rotation mutual parallel arrangement of multiunit and every two adjacent homogenate rollers in the homogenate portion, the slot has been seted up to the homogenate roller lateral wall, the slot is radially seted up along the homogenate roller.
Through adopting above-mentioned technical scheme, rotatory homogenate simultaneously of a plurality of homogenate rollers can make the fibre wadding group in the magma fully broken up and evenly distributed in the magma.
Further setting the following steps: the pressurization portion includes sealing connection in connecting portion and is used for in to a thick liquid portion pump sending magma and to its pressurized force (forcing) pump, install in the spiral channel of force (forcing) pump output end, spiral channel and the fixed and sealing connection of connecting portion lateral wall.
Through adopting above-mentioned technical scheme, the force (forcing) pump pressurizes magma and pump to go out the thick liquid portion in, and helical passage can make the rotatory entering of magma go out the thick liquid portion in and form the backward flow in a thick liquid portion, avoids the fibre wadding in the magma to agglomerate and precipitate.
Further setting the following steps: go out thick liquid portion inside and rotate and be connected with supplementary stirring fan blade, supplementary stirring fan blade axis perpendicular to goes out thick liquid portion bottom and sets up.
Through adopting above-mentioned technical scheme, supplementary stirring fan blade is rotatory to be stirred the magma, further homogenate and prevent the fibre flocculation group in the magma and deposit.
Further setting the following steps: and the top of the pulp outlet part is provided with a buffer part for ensuring the stability of the pressure in the pulp outlet part.
Through adopting above-mentioned technical scheme, buffer portion is used for guaranteeing that the pressure is stable in the thick liquid portion of appearing, guarantees that the magma is at the uniform velocity and quantitative outflow.
Further setting the following steps: buffer portion includes the baffle-box with play thick liquid portion intercommunication, separation and sealed baffle-box and play the plastic film of thick liquid portion, set up the bleeder vent at baffle-box top, the baffle-box has deformability through plastic film back cover and plastic film.
By adopting the technical scheme, when the pressure in the pulp outlet part is increased, the plastic film moves into the buffer box and exhausts the gas in the buffer box out of the buffer box through the air holes; when pressure in the thick liquid portion reduces, the plastic film removes to a thick liquid portion of going out, and outside gas passes through the bleeder vent and enters into the baffle-box, ensures that the pressure in the thick liquid portion of going out can not appear fluctuating by a wide margin.
Further setting the following steps: and a dust cover is arranged at the air vent.
Through adopting above-mentioned technical scheme, the dust cover is used for avoiding foreign matter, dust etc. to enter into in the baffle-box.
Further setting the following steps: and an alarm is arranged on the buffer box.
By adopting the technical scheme, when the pressure in the pulp outlet part exceeds a set value, the alarm works and gives an alarm, so that a producer can conveniently and timely overhaul the pulp flowing box, and the loss is reduced.
In conclusion, the invention has the following beneficial effects: through set up pressurization portion, connecting portion and buffering portion in the head box, reached and guaranteed that the head box can be quantitative at the uniform velocity play thick liquid effect.
Drawings
FIG. 1 is an internal structural view of the embodiment;
FIG. 2 is a schematic view of the construction of the distribution roll of the embodiment.
In the figure, 1, a box body; 11. a pulp inlet; 12. a pulp outlet; 13. a homogenizing roller; 131. a trench; 2. a homogenizing section; 3. a connecting portion; 4. a pulp outlet part; 41. auxiliary stirring fan blades; 5. a pressurization part; 51. a pressure pump; 52. a spiral channel; 6. a buffer section; 61. a buffer tank; 62. a plastic film; 63. air holes are formed; 64. a dust cover; 7. an alarm.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Example (b): a positive pressure flow box comprises a box body 1, wherein the box body 1 comprises a homogenizing part 2 positioned on the upstream side, a connecting part 3 arranged on the downstream side of the homogenizing part 2 and communicated with the homogenizing part, and a pulp outlet part 4 arranged on the downstream side of the connecting part 3 and communicated with the connecting part, wherein the connecting part 3 is used for connecting the homogenizing part 2 and the pulp outlet part 4, and the connecting part 3 is positioned at the position, close to the top end, of the homogenizing part 2 and the pulp outlet part 4. A pulp inlet 11 is provided in the homogenizing part 2, a pulp outlet 12 is provided at a position on the downstream side of the pulp outlet 4 and near the bottom, and pulp stock enters the head box from the pulp inlet 11 and flows out of the head box from the pulp outlet 12.
Referring to fig. 1, a plurality of sets of refining rollers 13 are rotatably connected in the refining section 2, and the rotation axes of each two adjacent refining rollers 13 are arranged in parallel. Referring to fig. 2, a plurality of groups of grooves 131 are irregularly formed on the outer side wall of the distribution roller 13, and the grooves 131 are formed along the radial direction of the distribution roller 13 and penetrate through the distribution roller 13, so that the contact area between the distribution roller 13 and the raw stock can be increased, and the fiber flocculation in the raw stock can be better dispersed.
Referring to fig. 1, a pressurizing part 5 for pumping and pressurizing virgin pulp is installed in the connecting part 3, and the pressurizing part 5 includes a pressurizing pump 51 and a spiral passage 52 installed in the connecting part 3; the spiral channel 52 is arranged on the downstream side of the pressure pump 51, so that the primary pulp can enter the pulp outlet 4 in a rotating manner and form a backflow in the pulp outlet 4, and the fiber flocculation in the primary pulp is prevented from being precipitated.
Referring to fig. 1, an auxiliary stirring blade 41 is rotatably connected inside the pulp outlet portion 4, the auxiliary stirring blade 41 is installed at a position near the bottom of the pulp outlet portion 4, and the rotation axis of the auxiliary stirring blade 41 is perpendicular to the bottom of the pulp outlet portion 4, so that the pulp can be further homogenized and the fiber flocculation in the raw pulp can be prevented from settling.
Referring to fig. 1, a buffer part 6 for ensuring stable pressure inside the pulp outlet part 4 is arranged at the top of the pulp outlet part 4, the buffer part 6 comprises a buffer tank 61 communicated with the pulp outlet part 4, and the buffer tank 61 is directly fixed and hermetically connected with the top of the pulp outlet part 4 through a bolt without the bottom; a plastic film 62 with deformation capability is fixedly connected to the bottom of the buffer box 61 and the river of the pulp outlet part 4, and the plastic film 62 separates and seals the buffer box 61 and the pulp outlet part 4 and seals the bottom of the buffer box 61; an air vent 63 is formed at the top of the buffer box 61, and a dust cover 64 for preventing foreign matters, dust, etc. from entering the buffer box 61 is provided at the top of the air vent 63. When the pressure in the pulp outlet part 4 rises, the plastic film 62 moves into the buffer box 61 and exhausts the gas in the buffer box 61 out of the buffer box 61 through the air vents 63; when the pressure in the pulp outlet part 4 is reduced, the plastic film 62 moves in the pulp outlet part 4, and the external gas enters the buffer tank 61 through the air holes 63, so that the pressure in the pulp outlet part 4 is ensured not to fluctuate greatly.
Referring to fig. 1, in order to facilitate the producers to timely overhaul the headbox and reduce the loss, an alarm 7 is further arranged on the buffer box 61, the alarm 7 comprises a driving power supply, a sensor, a single chip microcomputer, a connecting circuit and an alarm bell, and when the sensor senses that the pressure in the stock discharge part 4 exceeds a set value, the single chip microcomputer is connected with the alarm bell circuit to alarm.
During operation, magma enters into in the homogenate portion 2 from the thick liquid mouth 11, and homogenate roller 13 rotates and homogenizes the magma, makes the fibre wadding group in the homogenate fully broken up and evenly distributed in the magma, then the magma enters into out thick liquid portion 4 through connecting portion 3 in to the force (forcing) pump 51 that is located connecting portion 3 pressurizes the magma, makes it have rotatory entering into out thick liquid portion 4 of certain pressure, leaves the head box and accomplishes the head flow from a thick liquid mouth 12 at last. Pressurization portion 5 is direct pressurizes magma and add buffer 6 on play thick liquid portion 4, can guarantee the pressure stability of magma, makes the head box can the ration head flow at the uniform velocity, effectively stabilizes the speed that the magma flows out, and then reaches the effect that does not influence the body paper thickness of production. The spiral channel 52 and the auxiliary stirring fan blades 41 can avoid primary pulp precipitation and influence on the quantitative cross-width of paper. The alarm 7 can be used for a producer to know the condition of the headbox in time so as to avoid loss.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the present invention.
Claims (6)
1. A positive pressure headbox comprising: the pulping device comprises a box body (1), a pulping inlet (11) formed in the box body (1), a pulping outlet (12) formed in the box body (1) and a homogenizing roller (13) rotatably connected into the box body (1), and is characterized in that the box body (1) comprises a homogenizing part (2), a connecting part (3) arranged on the downstream side of the homogenizing part (2) and communicated with the homogenizing part, a pulping outlet (4) arranged on the downstream side of the connecting part (3) and communicated with the pulping outlet, and a pressurizing part (5) arranged in the connecting part (3) and used for pumping primary pulp and pressurizing the primary pulp, wherein the pulping outlet (12) is formed on the downstream side of the pulping outlet (4) and close to the bottom, and the pressurizing part (5) is arranged in the connecting part (3); the pressurizing part (5) comprises a pressurizing pump (51) which is hermetically connected in the connecting part (3) and used for pumping primary pulp into the pulp outlet part (4) and pressurizing the primary pulp, and a spiral channel (52) which is arranged at the output end of the pressurizing pump (51), wherein the spiral channel (52) is fixedly and hermetically connected with the side wall of the connecting part (3); go out thick liquid portion (4) inside and rotate and be connected with supplementary stirring fan blade (41), supplementary stirring fan blade (41) axis perpendicular to goes out thick liquid portion (4) bottom and sets up.
2. The positive pressure headbox according to claim 1, characterized in that the distribution rolls (13) are arranged in multiple groups in the homogenizing part (2), the rotation axes of every two adjacent distribution rolls (13) are arranged in parallel, the outer side walls of the distribution rolls (13) are provided with grooves (131), and the grooves (131) are arranged along the radial direction of the distribution rolls (13).
3. A positive-pressure headbox according to claim 1, characterized in that the top of the stock outlet section (4) is provided with a buffer section (6) for ensuring a stable pressure in the stock outlet section (4).
4. The positive pressure headbox according to claim 3, characterized in that the buffer section (6) comprises a buffer tank (61) communicating with the pulp outlet section (4), a plastic film (62) separating and sealing the buffer tank (61) and the pulp outlet section (4), and an air vent (63) arranged at the top of the buffer tank (61), wherein the buffer tank (61) is sealed by the plastic film (62) and the plastic film (62) has deformation capacity.
5. The positive pressure headbox according to claim 4, characterized in that a dust cover (64) is provided at the air vent (63).
6. A positive pressure headbox according to claim 4, characterised in that the surge tank (61) is provided with an alarm (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811639459.0A CN109505183B (en) | 2018-12-29 | 2018-12-29 | Positive pressure flow box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811639459.0A CN109505183B (en) | 2018-12-29 | 2018-12-29 | Positive pressure flow box |
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| Publication Number | Publication Date |
|---|---|
| CN109505183A CN109505183A (en) | 2019-03-22 |
| CN109505183B true CN109505183B (en) | 2021-06-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811639459.0A Active CN109505183B (en) | 2018-12-29 | 2018-12-29 | Positive pressure flow box |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111893790B (en) * | 2020-08-06 | 2022-09-27 | 刘帆 | Ultrasonic full-degradable biomass agricultural film production line system |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE756123A (en) * | 1969-09-18 | 1971-02-15 | Centre Tech Ind Papier | METHOD AND DEVICE FOR MANUFACTURING STRIPS OR SHEETS WITH ORIENTED STRUCTURE AND PRODUCT OBTAINED |
| US5736011A (en) * | 1996-07-17 | 1998-04-07 | Voith Sulzer Paper Technology North America, Inc. | Wet end assembly for a paper making machine |
| CN2273731Y (en) * | 1996-07-19 | 1998-02-04 | 东莞市佳鸣机械制造有限公司 | Air-cushion type pressure pulp flow box |
| CN102691225A (en) * | 2012-05-28 | 2012-09-26 | 华南理工大学 | Flow box device |
| CN103184703B (en) * | 2013-03-19 | 2015-06-03 | 陕西科技大学 | Flow box |
| CN205024522U (en) * | 2015-09-22 | 2016-02-10 | 山东群星纸业有限公司 | Positive pressure flow box |
| CN205295783U (en) * | 2015-11-25 | 2016-06-08 | 舟山市海山密封材料有限公司 | Whitewashing homogenate case |
| CN206635565U (en) * | 2017-03-03 | 2017-11-14 | 陆良成至包装有限公司 | A kind of cloth starches uniform paper making equipment head box |
| CN207862693U (en) * | 2018-01-23 | 2018-09-14 | 驻马店市白云纸业有限公司 | A kind of paper product production headbox apparatus |
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| CN109505183A (en) | 2019-03-22 |
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Effective date of registration: 20190816 Address after: 311804 Xiyanglong Village, Shanxia Lake Town, Zhuji City, Shaoxing City, Zhejiang Province Applicant after: Shaoxing Zhouzhi Electronics Co., Ltd. Address before: Room 401, No. 4, Huansha North Road, Jiyang Street, Zhuji City, Shaoxing City, Zhejiang Province Applicant before: Zhou Baitai |
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