CN110761106B - High-speed crescent head box - Google Patents
High-speed crescent head box Download PDFInfo
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- CN110761106B CN110761106B CN201911147615.6A CN201911147615A CN110761106B CN 110761106 B CN110761106 B CN 110761106B CN 201911147615 A CN201911147615 A CN 201911147615A CN 110761106 B CN110761106 B CN 110761106B
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- tank
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- 239000002002 slurry Substances 0.000 claims abstract description 27
- 230000007704 transition Effects 0.000 claims description 12
- 210000000481 breast Anatomy 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 238000004513 sizing Methods 0.000 claims description 3
- 238000000465 moulding Methods 0.000 abstract description 2
- 210000001503 joint Anatomy 0.000 description 7
- 238000013461 design Methods 0.000 description 6
- 229920001131 Pulp (paper) Polymers 0.000 description 4
- 239000003814 drug Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000011440 grout Substances 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 210000003734 kidney Anatomy 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- D21F1/04—Head boxes of cylinder machines
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- Paper (AREA)
Abstract
The invention relates to a high-speed crescent-shaped headbox, which comprises a box body, wherein an upper lip plate and a lower lip plate are arranged at the front end of the box body; the lower lip plate is detachably arranged on the box body; a turbulence generator is arranged in the box body; an adjusting base is arranged below the box body, a first hinge plate extends out of the lower end of the box body, a second hinge plate extends out of the rear end of the box body, and the adjusting base comprises a bottom plate, a gear box piece, a rack bar piece, a fixing table and a telescopic screw; the isobaric tank comprises a tank body, a slurry inlet is formed in the lower end of the tank body, a plurality of slurry outlet connectors are arranged on the side wall of the tank body, and the slurry outlet connectors are respectively connected with a plurality of turbulence pipes through a plurality of slurry inlet pipes; the upper end of the tank body is also fixedly provided with a feeding container, and a plurality of precise electromagnetic valves are arranged on the feeding container; the circumference side of the isobaric tank is detachably provided with an annular walking platform. The device has the advantages of high speed, high molding quality, convenient adjustment, safety and reliability.
Description
Technical Field
The invention relates to the technical field of papermaking equipment, in particular to a crescent-shaped headbox.
Background
The development process of the headbox is subjected to long-net, short-net, inclined-net and other structures, but the headbox has certain defects, and it is difficult to realize high quality and high productivity at the same time. For this reason, crescent-shaped headboxes have been invented which combine the quality of the paper with the speed of the machine. And through decades of development, the crescent-shaped headbox has become the dominant model of the global high-speed headbox and is also considered to be a relatively environment-friendly and economic model. It has the following advantages: the method has the advantages of high opening probability, good stability, high vehicle speed and high productivity; the aspect tension ratio of the paper industry can be 1.2-3.0: 1, adjusting within the range of 1; the controllability is good, and the quality of the quantitative transverse fluctuation finished paper is good by adopting a dilution water control system; the operation and maintenance are convenient. At present, the crescent-shaped headbox is mainly used for producing sanitary paper such as toilet paper, napkin paper and the like.
However, due to the characteristic of high speed, the crescent-shaped headbox is easy to wear or deform due to the impact of paper pulp, and the final quality of the product is affected. And the angle and the position of the existing crescent-shaped headbox are inconvenient to adjust. In addition, the control of the pulp feeding speed directly influences the forming quality of paper, and the control precision of the crescent-shaped pulp flow box at the aspect of the pulp feeding speed at present is still to be improved.
Therefore, it is a problem to be solved by those skilled in the art how to improve the existing crescent-shaped headbox so that the above problems can be overcome.
Disclosure of Invention
The invention aims to provide the high-speed crescent-shaped headbox which is high in speed, high in forming quality, convenient to adjust, safe and reliable.
In order to achieve the above purpose, the invention adopts the following technical scheme: the high-speed crescent-shaped headbox comprises a box body, wherein an upper lip plate and a lower lip plate are arranged at the front end of the box body, the upper lip plate and the lower lip plate are converged to form a lip area, an upper lip plate adjusting part is connected to the upper lip plate, and the front end of the lip area is aligned with a sizing area formed by a forming roller and a breast roller; the method is characterized in that:
the lower lip plate is detachably arranged on the box body;
A turbulence generator is arranged in the box body, the output end of the turbulence generator is connected with the lip area, the input end of the turbulence generator is connected with an isobaric tank, a plurality of turbulence generating pipes are transversely distributed in the turbulence generator, and each turbulence generating pipe comprises a circular section, a first transition section, an elliptical section, a second transition section and a waist-shaped section; the circular section is connected with the isobaric tank through a slurry inlet pipe, the waist-shaped section is connected with the lip area, the first transition section is smoothly connected with the circular section and the oval section, the second transition section is smoothly connected with the oval section and the waist-shaped section, the lengths of the major axis and the minor axis of the oval section are both larger than the diameter of the circular section, the length of the waist-shaped section is larger than the length of the major axis of the oval section, the width of the waist-shaped section is smaller than the length of the minor axis of the oval section, and the cross sections of the waist-shaped section and the oval section are the same;
An adjusting base is arranged below the box body, a first hinge plate extends out of the lower end of the box body, a second hinge plate extends out of the rear end of the box body, the adjusting base comprises a bottom plate, a gear box piece, a rack rod piece, a fixed table and a telescopic screw, the first hinge plate is hinged to the front end of the bottom plate, the gear box piece is hinged to the rear end of the bottom plate, the rack rod piece is hinged to the second hinge plate, a fine adjustment seat is arranged at the rear end of the bottom plate, the fixed table is fixedly arranged, the telescopic screw penetrates through and is in threaded connection with the fixed table, and the front end of the telescopic screw is in threaded connection with the fine adjustment seat; the gear in the gear box part is rotated to adjust the inclination angle of the box body, and the telescopic screw rod is rotated to finely adjust the distance between the bottom plate and the fixed table;
The isobaric tank comprises a tank body, a slurry inlet is formed in the lower end of the tank body, a plurality of slurry outlet connectors are arranged on the side wall of the tank body, and the slurry outlet connectors are respectively connected with a plurality of turbulence pipes through a plurality of slurry inlet pipes; the upper end of the tank body is also fixedly provided with a feeding container, the feeding container is provided with a plurality of precise electromagnetic valves, the precise electromagnetic valves are in one-to-one correspondence with the pulp outlet joints, and a connecting hose is arranged between the precise electromagnetic valves and the pulp outlet joints;
The detachable annular walking board that is provided with in isobaric jar week side, annular walking board includes two semicircular mesa, semicircular mesa merges the back and forms the ring shape mesa, semicircular mesa below all is provided with the supporting leg, the supporting leg bottom is provided with the universal wheel.
Preferably, the lower lip plate is provided with a plurality of fixing holes, and the fixing holes are suitable for bolts to pass through and fix the lower lip plate on the box body. The structure is a simple and reliable detachable installation mode.
Preferably, the length of the major half axis of the elliptical section is a, the length of the minor half axis of the elliptical section is b, the length of the kidney-shaped section is L, the radius of the kidney-shaped section is R, b=3/4 a, l= (11 pi/8+1/2) a, and r=1/4 a. The above parameters are set to have optimal effect on balance control of high flow rate and micro-turbulence.
As an improvement, three limit nuts are connected to the telescopic screw in a threaded manner, one of the limit nuts abuts against the fine adjustment seat to limit, and the other two limit nuts abut against two sides of the fixing table to limit. The fixability of the adjusting base is increased, and the front-back displacement can not occur after fixation.
Preferably, the tank body is cylindrical, the slurry outlet joints are uniformly distributed on the tank body along the circumferential direction, the feeding container is of a circular ring-shaped tubular structure, and the precise electromagnetic valve is uniformly distributed on the feeding container along the circumferential direction. The structure is simple and reasonable, and attractive and elegant.
As an improvement, guardrails are arranged above the semicircular table top; the annular walking board is also detachably provided with an escalator. The safety and the use convenience are improved.
Compared with the prior art, the invention has the following advantages:
1. Because the crescent-shaped headbox has the characteristic of high speed, the lower lip plate has a large length, and deformation or abrasion is easy to occur due to long-time impact and flow of paper pulp; deformation or abrasion of the lower lip plate directly influences the forming quality of the paper, so that the scheme designs a replaceable structure of the lower lip plate, and the forming quality of the paper is guaranteed.
2. The structural arrangement of the turbulent flow generating tube adopts the hydraulic principle to ensure that high-strength micro-turbulence is generated by energy conversion when the high-speed slurry flows through the turbulent flow generating tube, so that the fiber suspension in the slurry flows is well dispersed. Especially for the high-speed headbox, the scheme adopts the design of the elliptical section, so that the balance of high flow speed and micro-turbulence can be controlled to the greatest extent; the design of the waist-shaped section is adopted, the waist-shaped section has a flat structure, and the slurry flows are dispersed at two sides, so that the slurry flows can smoothly and uniformly enter the lip area, and the molding quality is better; and the micro-turbulence not only occurs when the circular section enters the elliptical section, but also occurs when the elliptical section enters the waist-shaped section, and the micro-turbulence is more sufficient through the design of the multi-section pipe section, so that the fiber suspension and dispersion in the slurry flow are better. It is worth mentioning that the design that oval section and waist shape section cross sectional area are the same for the flow of two sections is the same, just can keep high speed. In addition, the design of the flat outlet of the turbulence tube is beneficial to producing lighter and thinner sanitary paper such as toilet paper, napkin paper and the like, and the flat outlet of the turbulence tube has larger width, so that the number of the turbulence tubes can be reduced while the high speed is ensured, and the equipment cost is reduced.
3. The setting of adjusting the base has two adjusting modes of front-back linear adjustment and up-down angle adjustment, so that the position relation between the lip area and the forming roller as well as between the lip area and the breast roller can be kept at the optimal position, and the forming quality of paper is ensured.
4. Compared with the existing crescent-shaped headbox, the scheme has the advantages that the pulp inlet taper pipe is removed, the turbulence sending pipes are directly connected with the isobaric tank, the pulp inlet speed of each turbulence sending pipe can be accurately controlled by the pulp outlet joint on the isobaric tank, the flow speed is not controlled by the passive pulp inlet taper pipe, and accordingly the paper forming quality is accurately controlled. In addition, the charging container of the scheme can generally store the liquid medicine which needs to be added, and the liquid medicine has important influence on the performance of the final paper. The internal storage paper pulp of jar of this scheme can adjust the liquid medicine of different proportions when the ejection of compact, can be according to the liquid medicine volume of the flow rate accurate control entering turbulent flow sending out pipe of paper pulp, guarantees paper fashioned quality.
5. The annular walking board can be closed from two sides to the middle and is arranged around the isobaric tank for maintaining and adjusting the isobaric tank. The annular walking board can be conveniently moved away when not in use.
Drawings
FIG. 1 is a schematic diagram of a structure according to a preferred embodiment of the present invention;
FIG. 2 is a schematic view of the structure of a housing portion in accordance with a preferred embodiment of the present invention;
FIG. 3 is a schematic diagram of the structure of a turbulence generator in accordance with a preferred embodiment of the present invention;
FIG. 4 is a schematic perspective view of a turbulence tube in accordance with a preferred embodiment of the present invention;
FIG. 5 is an axial view of a turbulence tube in accordance with a preferred embodiment of the present invention;
FIG. 6 is a cross-sectional view taken along A-A in FIG. 5 in accordance with a preferred embodiment of the present invention;
FIG. 7 is a cross-sectional view taken along B-B in FIG. 5 in accordance with a preferred embodiment of the present invention;
FIG. 8 is a cross-sectional view of an elliptical segment in accordance with a preferred embodiment of the present invention;
FIG. 9 is a cross-sectional view of a kidney section in accordance with a preferred embodiment of the present invention;
FIG. 10 is a schematic view of the structure of the lower lip in accordance with a preferred embodiment of the present invention;
FIG. 11 is a schematic view of the structure of an adjustment base in accordance with a preferred embodiment of the present invention;
FIG. 12 is a schematic diagram of the structure of an isopipe in accordance with a preferred embodiment of the present invention;
FIG. 13 is a top view of a precision solenoid valve arranged on a feed container in accordance with a preferred embodiment of the present invention;
FIG. 14 is a top view of the arrangement of the grout joint on the tank according to one preferred embodiment of the present invention;
FIG. 15 is a side view of the annular deck in accordance with a preferred embodiment of the present invention;
FIG. 16 is a top view of the annular deck in accordance with a preferred embodiment of the present invention.
Detailed Description
The following description is presented to enable one of ordinary skill in the art to make and use the invention. The preferred embodiments in the following description are by way of example only and other obvious variations will occur to those skilled in the art.
In the description of the present invention, it should be noted that, for the azimuth words such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the azimuth and positional relationships are based on the azimuth or positional relationships shown in the drawings, it is merely for convenience of describing the present invention and simplifying the description, and it is not to be construed as limiting the specific scope of protection of the present invention that the device or element referred to must have a specific azimuth configuration and operation.
As shown in fig. 1 to 16, a preferred embodiment of the present invention comprises a box 1, wherein an upper lip 2 and a lower lip 3 are provided at the front end of the box 1, the upper lip 2 and the lower lip 3 are converged to form a lip area, an upper lip adjusting part 4 is connected to the upper lip 2, and the front end of the lip area is aligned with a sizing area formed by a forming roll 100 and a breast roll 200.
1. The lower lip 3 is detachably arranged on the box body 1. The lower lip 3 is provided with a plurality of fixing holes 31, and the fixing holes 31 are suitable for bolts to pass through and fix the lower lip 3 on the box 1.
2. A turbulence generator 5 is arranged in the box body 1, the output end of the turbulence generator 5 is connected with a lip area, the input end of the turbulence generator 5 is connected with an isobaric tank 7, a plurality of turbulence pipes 51 are transversely distributed in the turbulence generator 5, and each turbulence pipe 51 comprises a circular section 511, a first transition section 512, an elliptical section 513, a second transition section 514 and a waist-shaped section 515; the circular section 511 is connected with the isobaric tank 7 through the slurry inlet pipe 9, the waist-shaped section 515 is connected with the lip area, the first transition section 512 is connected with the circular section 511 and the elliptical section 513 smoothly, the second transition section 514 is connected with the elliptical section 513 and the waist-shaped section 515 smoothly, the lengths of the long axis and the short axis of the elliptical section 513 are both larger than the diameter of the circular section 511, the length of the waist-shaped section 515 is larger than the length of the long axis of the elliptical section 513, the width of the waist-shaped section 515 is smaller than the length of the short axis of the elliptical section 513, and the cross sections of the waist-shaped section 515 and the elliptical section 513 are the same. The length of a long half shaft of the elliptical section is a, the length of a short half shaft of the elliptical section is b, the length of the kidney-shaped section is L, the radius of the kidney-shaped section is R, b=3/4 a, L= (11 pi/8+1/2) a, and R=1/4 a. In this example, a=20mm, b=15mm, l=96.35 mm, r=5 mm.
3. An adjusting base 6 is arranged below the box body 1, a first hinge plate 11 extends from the lower end of the box body 1, a second hinge plate 12 extends from the rear end of the box body 1, the adjusting base 6 comprises a bottom plate 61, a gear box piece 62, a rack rod piece 63, a fixed table 64 and a telescopic screw 65, the first hinge plate 11 is hinged to the front end of the bottom plate 61, the gear box piece 62 is hinged to the rear end of the bottom plate 61, the rack rod piece 63 is hinged to the second hinge plate 12, a fine adjustment seat 611 is arranged at the rear end of the bottom plate 61, the fixed table 64 is fixedly arranged, the telescopic screw 65 penetrates through and is in threaded connection with the fixed table 64, and the front end of the telescopic screw 65 is in threaded connection with the fine adjustment seat 611; the inclination angle of the case 1 can be adjusted by rotating the gears in the gear case 62, and the distance between the bottom plate 61 and the fixed table 64 can be finely adjusted by rotating the telescopic screw 65. In order to increase the fixation, three limit nuts 66 are screwed on the telescopic screw 65, one of the limit nuts 66 abuts against the fine adjustment seat 611 to limit, and the other two limit nuts 66 abut against two sides of the fixing table 64 to limit.
4. The isobaric tank 7 comprises a tank body 71, a slurry inlet 72 is formed in the lower end of the tank body 71, a plurality of slurry outlet connectors 73 are arranged on the side wall of the tank body 71, and the slurry outlet connectors 73 are respectively connected with a plurality of turbulence generating pipes 51 through a plurality of slurry inlet pipes 9; the upper end of the tank body 71 is also fixedly provided with a feeding container 74, the feeding container 74 is provided with a plurality of precise electromagnetic valves 75, the precise electromagnetic valves 75 are in one-to-one correspondence with the grout outlet joints 73, and a connecting hose 76 is arranged between the precise electromagnetic valves 75 and the grout outlet joints 73. Wherein, the tank body 71 is cylindrical, the slurry outlet joints 73 are uniformly distributed on the tank body 71 along the circumferential direction, the feeding container 74 is in a circular ring tubular structure, and the precise electromagnetic valve 75 is uniformly distributed on the feeding container 74 along the circumferential direction.
5. The circumference side of the isobaric tank 7 is detachably provided with an annular walking platform 8, the annular walking platform 8 comprises two semicircular table tops 81, the semicircular table tops 81 are combined to form an annular table top, supporting legs 82 are arranged below the semicircular table tops 81, and universal wheels 83 are arranged at the bottoms of the supporting legs 82. Guard rails 84 are arranged above the semicircular table tops 81; an escalator 85 is also detachably arranged on one side of the annular walking platform 8.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made therein without departing from the spirit and scope of the invention, which is defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. The high-speed crescent-shaped headbox comprises a box body, wherein an upper lip plate and a lower lip plate are arranged at the front end of the box body, the upper lip plate and the lower lip plate are converged to form a lip area, an upper lip plate adjusting part is connected to the upper lip plate, and the front end of the lip area is aligned with a sizing area formed by a forming roller and a breast roller; the method is characterized in that:
the lower lip plate is detachably arranged on the box body;
A turbulence generator is arranged in the box body, the output end of the turbulence generator is connected with the lip area, the input end of the turbulence generator is connected with an isobaric tank, a plurality of turbulence generating pipes are transversely distributed in the turbulence generator, and each turbulence generating pipe comprises a circular section, a first transition section, an elliptical section, a second transition section and a waist-shaped section; the circular section is connected with the isobaric tank through a slurry inlet pipe, the waist-shaped section is connected with the lip area, the first transition section is smoothly connected with the circular section and the oval section, the second transition section is smoothly connected with the oval section and the waist-shaped section, the lengths of the major axis and the minor axis of the oval section are both larger than the diameter of the circular section, the length of the waist-shaped section is larger than the length of the major axis of the oval section, the width of the waist-shaped section is smaller than the length of the minor axis of the oval section, and the cross sections of the waist-shaped section and the oval section are the same;
An adjusting base is arranged below the box body, a first hinge plate extends out of the lower end of the box body, a second hinge plate extends out of the rear end of the box body, the adjusting base comprises a bottom plate, a gear box piece, a rack rod piece, a fixed table and a telescopic screw, the first hinge plate is hinged to the front end of the bottom plate, the gear box piece is hinged to the rear end of the bottom plate, the rack rod piece is hinged to the second hinge plate, a fine adjustment seat is arranged at the rear end of the bottom plate, the fixed table is fixedly arranged, the telescopic screw penetrates through and is in threaded connection with the fixed table, and the front end of the telescopic screw is in threaded connection with the fine adjustment seat; the gear in the gear box part is rotated to adjust the inclination angle of the box body, and the telescopic screw rod is rotated to finely adjust the distance between the bottom plate and the fixed table;
The isobaric tank comprises a tank body, a slurry inlet is formed in the lower end of the tank body, a plurality of slurry outlet connectors are arranged on the side wall of the tank body, and the slurry outlet connectors are respectively connected with a plurality of turbulence pipes through a plurality of slurry inlet pipes; the upper end of the tank body is also fixedly provided with a feeding container, the feeding container is provided with a plurality of precise electromagnetic valves, the precise electromagnetic valves are in one-to-one correspondence with the pulp outlet joints, and a connecting hose is arranged between the precise electromagnetic valves and the pulp outlet joints;
The detachable annular walking board that is provided with in isobaric jar week side, annular walking board includes two semicircular mesa, semicircular mesa merges the back and forms the ring shape mesa, semicircular mesa below all is provided with the supporting leg, the supporting leg bottom is provided with the universal wheel.
2. A high speed crescent shaped headbox according to claim 1 wherein: the lower lip plate is provided with a plurality of fixing holes, and the fixing holes are suitable for bolts to pass through and fix the lower lip plate on the box body.
3. A high speed crescent shaped headbox according to claim 1 wherein: the length of a long half shaft of the elliptical section is a, the length of a short half shaft of the elliptical section is b, the length of the kidney-shaped section is L, the radius of the kidney-shaped section is R, b=3/4 a, L= (11 pi/8+1/2) a, and R=1/4 a.
4. A high speed crescent shaped headbox according to claim 1 wherein: the telescopic screw is connected with three limit nuts in a threaded manner, one of the limit nuts abuts against the fine adjustment seat to limit, and the other two limit nuts abut against two sides of the fixing table to limit.
5. A high speed crescent shaped headbox according to claim 1 wherein: the tank body is cylindrical, the slurry outlet joints are uniformly distributed on the tank body along the circumferential direction, the feeding container is of a circular ring-shaped tubular structure, and the precise electromagnetic valve is uniformly distributed on the feeding container along the circumferential direction.
6. A high speed crescent shaped headbox according to claim 1 wherein: guard rails are arranged above the semicircular table top; the annular walking board is also detachably provided with an escalator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911147615.6A CN110761106B (en) | 2019-11-21 | 2019-11-21 | High-speed crescent head box |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911147615.6A CN110761106B (en) | 2019-11-21 | 2019-11-21 | High-speed crescent head box |
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| CN110761106A CN110761106A (en) | 2020-02-07 |
| CN110761106B true CN110761106B (en) | 2024-05-14 |
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| CN201911147615.6A Active CN110761106B (en) | 2019-11-21 | 2019-11-21 | High-speed crescent head box |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114182560B (en) * | 2021-12-08 | 2023-07-14 | 浙江华章科技有限公司 | Flow control mechanism and control method for head box and head box |
| CN114182566B (en) * | 2021-12-08 | 2023-07-11 | 浙江华章科技有限公司 | Valve opening control system of headbox |
| CN114197235B (en) * | 2021-12-20 | 2023-07-14 | 浙江华章科技有限公司 | Hydraulic head box convenient to maintain |
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2019
- 2019-11-21 CN CN201911147615.6A patent/CN110761106B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19926805A1 (en) * | 1999-06-12 | 2000-12-14 | Voith Sulzer Papiertech Patent | Stock inlet for a papermaking machine etc has one or more fluid injectors at the turbulence tubes to inject controlled fluid doses with min effect on the total suspension vol flow |
| DE10133552A1 (en) * | 2001-07-11 | 2003-01-23 | Voith Paper Patent Gmbh | Stock inlet, for a papermaking/cardboard production machine, has a blade at the outflow with a gap between it and the side walls and an angled chamfer to prevent a pulp build-up |
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| CN110761106A (en) | 2020-02-07 |
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