CN114411440A - Vacuum carrier roller barrel drilling structure and preparation method thereof - Google Patents
Vacuum carrier roller barrel drilling structure and preparation method thereof Download PDFInfo
- Publication number
- CN114411440A CN114411440A CN202210169649.0A CN202210169649A CN114411440A CN 114411440 A CN114411440 A CN 114411440A CN 202210169649 A CN202210169649 A CN 202210169649A CN 114411440 A CN114411440 A CN 114411440A
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- hole
- stainless steel
- drilling
- roller body
- steel roller
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Classifications
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/10—Suction rolls, e.g. couch rolls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B41/00—Boring or drilling machines or devices specially adapted for particular work; Accessories specially adapted therefor
Abstract
The invention discloses a vacuum roller barrel drilling structure which comprises a surface glue drilling hole and a stainless steel roller drilling hole, wherein an axle core of the surface glue drilling hole and the stainless steel roller drilling hole are arranged on the same straight line, the inner diameters of the surface glue drilling hole and the stainless steel roller drilling hole are basically the same or slightly smaller, a connecting transition port is arranged at one end of the stainless steel roller drilling hole, which is in contact with the surface glue drilling hole, and the diameter of the connecting part of the transition port and the surface glue drilling hole is larger than that of the surface glue drilling hole. According to the invention, after the roller body adopts the transition hole structure, the diameter of the drill hole of the vacuum roller stainless steel roller body is the same as or close to the diameter of the rubber drill hole of the surface of the vacuum roller, so that the difference of the sectional areas of the rubber holes of the roller stainless steel roller body and the surface of the vacuum roller is reduced, and the air volume is reduced when the vacuum roller is used for vacuumizing, thereby reducing the power consumption of vacuumizing and achieving the effect of energy conservation.
Description
Technical Field
The invention relates to the technical field of energy conservation of papermaking equipment, in particular to a vacuum carrier roller barrel drilling structure and a preparation method thereof.
Background
At present, a high-speed paper machine in the papermaking industry generally uses a vacuum carrier roller to perform reinforced dehydration on wet paper sheets on a felt so as to reduce the moisture of the wet paper sheets and improve the dryness of the wet paper sheets, thereby reducing the consumption of steam during drying of a drying cylinder, but the method has the following problems: 1. the diameter of a drilled hole on the surface rubber of the vacuum carrier roller is 2.5-3.7 mm (generally 3mm), and the diameter of a drilled hole on the stainless steel cylinder of the vacuum carrier roller is 4.5-5mm (generally 4.5mm), so that the diameter of the rubber roller is inconsistent with that of the cylinder, the diameter of the formed roller cylinder is about 40% larger than that of the rubber surface of the carrier roller, about 40% of air allowance is added during vacuum pumping, and the vacuum pump wastes excessive power consumption. 2. When the vacuum carrier roller is drilled in a large hole, the strength of the roller body is reduced, the deflection resistance of the carrier roller is reduced, the thickness of the roller needs to be increased to make up, and unnecessary materials are added. 3. In order to improve the drilling efficiency and reduce the risk of small and easy breakage of a drill bit, a drill bit with the diameter of 4.5-5mm is generally selected for drilling a hole of a carrier roller in a carrier roller manufacturing factory, and the carrier roller manufacturing factory is one of the reasons for oversize drilling of a vacuum carrier roller cylinder. 4. Because the existing gang drill for drilling carrier roller holes is not high in precision and can be used as an indexing drilling machine, and the twist drill is slow in drilling speed, poor in chip removal, poor in centering property and poor in surface smoothness, the drill hole is larger during drilling of the carrier roller stainless steel roller body, so that the drill machine is used for drilling the rubber hole after the carrier roller is coated with rubber, the rubber hole and the roller hole are concentric and aligned to form a 100% through hole, and the rubber hole and the roller hole have some size deviation during machining, so that the drill hole of the carrier roller stainless steel roller body is larger when an empirical value is obtained, a drill bit with the diameter of 4.5-5mm is used for drilling, and the through hole rate is ensured to reach 100%, which is one of the reasons. 5. In the production process of papermaking, chemical engineering or water quality or improper process is sometimes used to cause the problem that a vacuum suction small hole of a vacuum carrier roller forms a scale layer, and the phenomenon of hole blocking is caused in severe cases, so that some use manufacturers require the vacuum carrier roller to drill a larger hole so as to slow down the time of hole blocking caused by scale.
With the implementation of the policy of 'double carbon', further energy conservation and consumption reduction in the papermaking industry are required to be solved by technical improvement, equipment of a paper making machinery plant in China is continuously upgraded at present, the precision of a carrier roller drilling machine is basically synchronous with the foreign level and reaches the advanced level, and the real carrier roller of a paper machine is subjected to finish machining under the condition that the surface rubber of the carrier roller and the aperture ratio and the aperture of a carrier roller cylinder body are the same or close to each other, so that the produced carrier roller can be used for achieving the energy-saving effect of a vacuum system.
Disclosure of Invention
The invention aims to: aiming at the existing problems, the invention provides a vacuum carrier roller cylinder body drilling structure, after a connecting port is added into a carrier roller cylinder body to form a transition hole structure, the diameter of a vacuum carrier roller stainless steel roller body drilling hole and a vacuum carrier roller surface rubber drilling hole reach the same diameter or a diameter close to the same diameter, the difference of the cross sections of the carrier roller stainless steel roller body and the vacuum carrier roller surface rubber hole is reduced, and the air volume is reduced by 40% when a vacuum carrier roller is used for vacuumizing, so that the power consumption of vacuumizing is reduced, and the effect of saving energy is achieved.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:
the utility model provides a vacuum bearing roller barrel drilling structure which characterized in that: the drilling device comprises a surface glue drilling hole and a stainless steel roller body drilling hole, wherein the shaft core is arranged on a straight line, the inner diameters of the surface glue drilling hole and the stainless steel roller body drilling hole are the same or slightly smaller than that of the stainless steel roller body drilling hole, a transition port is arranged at one end, in contact with the surface glue drilling hole, of the stainless steel roller body drilling hole, and the diameter of the joint of the transition port and the surface glue drilling hole is larger than that of the surface glue drilling hole and that of the stainless steel roller body drilling hole.
Further, the transition port is a coaxial counter bore integrally connected with the stainless steel roller body, the counter bore is located at the joint of the stainless steel roller body and the surface glue, the diameter of the counter bore is larger than the aperture of the stainless steel roller body, the apertures of the surface glue drilled hole and the stainless steel roller body are the same or the inner diameter of the surface glue drilled hole is slightly smaller than the inner diameter of the stainless steel roller body drilled hole, and the aperture of the surface glue drilled hole is smaller than the aperture of the coaxial counter bore.
Further, the counter bore is a cylindrical counter bore.
Furthermore, the counter sink is a taper hole, and one end of a small opening of the taper hole is connected with the stainless steel roller body drilling hole, and the diameter of the taper hole is consistent with that of the stainless steel roller body drilling hole.
Further, the diameter of the counter bore is gradually increased from the inside of the stainless steel roller body to the outside, the counter bore is cylindrical at the joint with the surface glue drilling hole, and the diameter of the smallest end of the counter bore is consistent with the diameter of the stainless steel roller body drilling hole.
Further, the inner diameters of the surface glue drilling hole and the stainless steel roller body drilling hole are both 3-3.7 mm.
Furthermore, the aperture of the connecting end of the transition port and the surface glue drilling hole is 4-6 mm.
Further, the preparation method of the vacuum roller barrel comprises the following steps: after the stainless steel roller body of the vacuum carrier roller is drilled, coaxial counter bores are processed on the surface of the stainless steel roller body drilled hole, surface glue drilled holes with the diameter being the same as or slightly smaller than that of the stainless steel roller body drilled hole are drilled in the surface glue, and the positions of the drilled holes are communicated with the counter bores.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. according to the invention, after the transition port is added to form the transition hole structure, the diameter of the drill hole of the stainless steel roller body of the vacuum carrier roller and the diameter of the surface rubber drill hole of the vacuum carrier roller reach the same diameter or close diameter, the difference of the sectional areas of the surface rubber drill holes of the stainless steel roller body of the carrier roller and the vacuum carrier roller is reduced, and the air volume is reduced by 40% when the vacuum carrier roller is used for vacuumizing, so that the power consumption of vacuumizing is reduced, and the effect of saving energy is achieved. Or the vacuum carrier roller is provided with a power vacuum pump with the same configuration, which is beneficial to improving the vacuum degree of the carrier roller, promoting the dehydration of the wet paper pages, improving the speed of the paper machine or reducing the consumption of steam, thereby achieving the effect of energy conservation.
2. According to the invention, the rigidity of the vacuum carrier roller is enhanced by reducing the diameter of the drill hole of the stainless steel roller body of the vacuum carrier roller, the anti-deflection and anti-fatigue strength capability is increased, and the safe service life of the carrier roller is prolonged.
3. The drilling belt of the invention generally uses a high-speed drill with the rotating speed of 6000 to 30000 r/min (a low-speed gang drill can also be used), the center flow of the drill cools cutting fluid, and a special vacuum roller gang drill has high finish in drilled small holes and is not easy to generate the scale on the surface of the holes. Or the gang drill special for the carrier roller with low precision can also be used for processing to achieve the process effect, but the inner surface of the small hole has low smoothness, so that the problem of scale deposition on the surface of the small hole is reduced.
Drawings
FIG. 1 is a schematic structural view of example 1 of the present invention;
FIG. 2 is a schematic structural view of example 2 of the present invention;
FIG. 3 is a schematic structural view of example 3 of the present invention;
FIG. 4 is a schematic structural diagram of a conventional vacuum idler;
in the attached drawing, 1-stainless steel roller body, 2-stainless steel roller body drilling, 3-polyurethane glue or composite rubber, 4-surface glue drilling and 5-transition port.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to preferred embodiments. It should be noted, however, that the numerous details set forth in the description are merely for the purpose of providing the reader with a thorough understanding of one or more aspects of the present invention, which may be practiced without these specific details.
Example 1
As shown in fig. 1, a vacuum carrier roller cylinder drilling structure comprises a surface glue drilling hole and a stainless steel roller drilling hole, wherein the shaft core of the surface glue drilling hole and the stainless steel roller drilling hole are arranged on the same straight line, the inner diameters of the surface glue drilling hole and the stainless steel roller drilling hole are consistent or slightly smaller, one end of the stainless steel roller drilling hole, which is in contact with the surface glue drilling hole, is provided with a connecting transition port, and the diameter of the connecting transition port, which is connected with the surface glue drilling hole, is larger than the diameter of the surface glue drilling hole and the diameter of the stainless steel roller drilling hole; the connecting port is a counter bore integrally connected with the stainless steel roller body, the counter bore is positioned at the joint of the stainless steel roller body and the surface glue, the bore diameters of the surface glue bore and the stainless steel roller body bore are consistent or slightly smaller, and the bore diameter of the surface glue bore is smaller than that of the counter bore. The counter bore is a cylindrical counter bore; the inner diameters of the surface glue drilling hole and the stainless steel roller body drilling hole are both in the range of 3-3.7mm, and are generally 3 mm; the aperture of the connecting end of the transition port and the surface adhesive drilling hole is 3.5-6 mm, and is generally 4.5 mm.
The preparation method of the vacuum roller barrel comprises the following steps: drilling a hole in the stainless steel roller body of the vacuum carrier roller, wherein the diameter of the drilled hole is 3-3.7mm, machining a counter bore with the diameter of 3.5-6 mm on the surface of the drilled hole in the stainless steel roller body, drilling a surface glue drilled hole with the diameter which is consistent with or slightly smaller than that of the drilled hole in the stainless steel roller body in the surface glue, and communicating the position of the drilled hole with the counter bore.
Example 2
As shown in fig. 2, a vacuum carrier roller cylinder drilling structure comprises a surface glue drilling hole and a stainless steel roller drilling hole, wherein the shaft core of the surface glue drilling hole and the stainless steel roller drilling hole are arranged on the same straight line, the inner diameters of the surface glue drilling hole and the stainless steel roller drilling hole are consistent or slightly smaller, one end of the stainless steel roller drilling hole, which is in contact with the surface glue drilling hole, is provided with a connecting transition port, and the diameter of the connecting transition port, which is connected with the surface glue drilling hole, is larger than the diameter of the surface glue drilling hole and the diameter of the stainless steel roller drilling hole; the connecting port is a counter bore integrally connected with the stainless steel roller body, the counter bore is positioned at the joint of the stainless steel roller body and the surface glue, the bore diameters of the surface glue bore and the stainless steel roller body bore are consistent or slightly smaller, and the bore diameter of the surface glue bore is smaller than that of the counter bore; the counter sink is a conical hole, one end of a small opening of the conical hole is connected with a stainless steel roller body drilled hole, and the diameter of the counter sink is consistent with that of the stainless steel roller body drilled hole; the inner diameters of the surface glue drilling hole and the stainless steel roller body drilling hole are both 3-3.7 mm; the aperture of the connecting end of the transition port and the surface adhesive drilling hole is 3.5-6 mm.
The preparation method of the vacuum roller barrel comprises the following steps: after the stainless steel roller body of the vacuum carrier roller is drilled, a counter bore with the diameter of 3.5-6 mm is processed on the surface of the stainless steel roller body, a surface glue drilling hole with the diameter being consistent with or slightly smaller than that of the stainless steel roller body is drilled in the surface glue, and the position of the surface glue drilling hole is communicated with the counter bore.
Example 3
As shown in fig. 3, a vacuum carrier roller cylinder drilling structure comprises a surface glue drilling hole and a stainless steel roller drilling hole, wherein the shaft core of the surface glue drilling hole and the stainless steel roller drilling hole are arranged on the same straight line, the inner diameters of the surface glue drilling hole and the stainless steel roller drilling hole are consistent or slightly smaller, one end of the stainless steel roller drilling hole, which is in contact with the surface glue drilling hole, is provided with a connecting transition port, and the diameter of the connecting transition port, which is connected with the surface glue drilling hole, is larger than the diameter of the surface glue drilling hole and the diameter of the stainless steel roller drilling hole; the connecting transition port is a counter bore integrally connected with the stainless steel roller body, the counter bore is positioned at the joint of the stainless steel roller body and the surface glue, the hole diameters of the surface glue drilled hole and the stainless steel roller body drilled hole are consistent or slightly smaller, and the hole diameter of the surface glue drilled hole is smaller than that of the counter bore; the diameter of the countersunk hole is gradually increased from the inner part of the stainless steel roller body to the outer part, the countersunk hole is cylindrical at the joint with the surface glue drilling hole, and the diameter of the smallest end of the countersunk hole is consistent with the diameter of the stainless steel roller body drilling hole; the inner diameters of the surface glue drilling hole and the stainless steel roller body drilling hole are both 3-3.7 mm; the aperture of the connecting end of the transition port and the surface adhesive drilling hole is 3.5-6 mm.
The preparation method of the vacuum roller barrel comprises the following steps: after the stainless steel roller body of the vacuum carrier roller is drilled, a counter bore with the diameter of 3.5-6 mm is processed on the surface of the stainless steel roller body, a surface glue drilling hole with the diameter being consistent with or slightly smaller than that of the stainless steel roller body is drilled in the surface glue, and the position of the surface glue drilling hole is communicated with the counter bore.
As shown in fig. 4, the diameter of the rubber drilling hole on the surface of the traditional vacuum carrier roller is 3 to 3.5mm, and the diameter of the corresponding drilling hole on the stainless steel roller body of the vacuum carrier roller is 4.5 to 5mm, so that a structure with a large rubber hole and a large roller hole is formed, and the air capacity of the small hole is calculated as follows: (surface paste thickness 25 x 3.14 x cell radius 1.52+ roll wall thickness 60 x 3.14 x cell radius 2.252) roll drilling number m-1130.4 m square mm.
According to the invention, the diameter of a drill hole of a stainless steel roller body of the vacuum carrier roller is 3-3.7mm, and a small hole with the diameter close to 3mm is processed as much as possible under the condition of the precision allowance of a drilling machine so as to reduce the redundant space of the small hole with the diameter exceeding 3mm, if the small hole with the diameter of 3mm is drilled, the air volume of the small hole is calculated as follows: (surface paste thickness 25 x 3.14 x cell radius 1.52+ roll wall thickness 60 x 3.14 x cell radius 1.52) roll drilling number m is 600.5m square mm.
Compared with the volume of the two structures, the volume of the small hole is reduced by 529.9m square millimeters and about 46.8% (1-600.5/1130.4) of the volume rate by adopting the method, so that the air quantity in the small hole is reduced by about half, a vacuum pump with smaller air suction quantity can be used for achieving the same vacuum degree effect, the use power of a motor of the vacuum pump is reduced, and the vacuum power consumption is reduced.
And because the vacuum carrier roller stainless steel roller body is drilled with 3mm small suction holes, if the center deviation of the surface rubber drilled small suction holes is large, 100 percent of vacuum suction through holes can not be formed, the joint of the two small holes is staggered, the flow cross section of the effective suction holes is reduced, the normal operation of vacuum suction of the vacuum carrier roller is influenced, and the dehydration effect of the wet paper pages can not be achieved. The method for solving the problem of processing dislocation of the two apertures comprises the following steps: the method is characterized in that a stainless steel roller body of the vacuum carrier roller is drilled, a counter bore or a taper hole is machined in the surface of the stainless steel roller body, when a small rubber suction hole of the surface of the vacuum carrier roller is machined and the small rubber suction hole of the stainless steel roller body is staggered, the two holes can be connected in a transition mode through the large counter bore or the taper hole to achieve 100% smoothness, and the method is the main key point for solving the problem. The counter bore specification is selectable, and the air capacity of the small hole is calculated as: (case thickness 25 x 3.14 x cell radius 1.52+ counterbore depth 3 x 3.14 + counterbore diameter 2.252+ roll wall thickness 57 x 3.14 x cell radius 1.52) The number m of the roller drilling holes is 627.5m square millimeters, compared with the traditional small hole structure, the volume of the roller drilling holes is reduced by 502.9m square millimeters after the transitional counter bores are adopted, the volume ratio is reduced by 44.5% (1-627.5/1130.4), and the problem of power consumption caused by the fact that the storage air space is large and the waste of vacuum and the excessive evacuation are caused due to the fact that the roller body is large in drilling holes is effectively solved.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention.
Claims (8)
1. The utility model provides a vacuum bearing roller barrel drilling structure which characterized in that: the drilling device comprises a surface glue drilling hole and a stainless steel roller body drilling hole, wherein the shaft core is arranged on a straight line, the inner diameters of the surface glue drilling hole and the stainless steel roller body drilling hole are the same or slightly smaller than that of the stainless steel roller body drilling hole, a transition port is arranged at one end, in contact with the surface glue drilling hole, of the stainless steel roller body drilling hole, and the diameter of the joint of the transition port and the surface glue drilling hole is larger than that of the surface glue drilling hole and that of the stainless steel roller body drilling hole.
2. The vacuum carrier roller cylinder drilling structure as claimed in claim 1, wherein: the transition port is a coaxial counter bore integrally connected with the stainless steel roller body, the counter bore is located at the joint of the stainless steel roller body and the surface glue, the diameter of the counter bore is larger than the aperture of the stainless steel roller body, the apertures of the surface glue drilled hole and the stainless steel roller body drilled hole are the same or the inner diameter of the surface glue drilled hole is slightly smaller than the inner diameter of the stainless steel roller body drilled hole, and the aperture of the surface glue drilled hole is smaller than the aperture of the coaxial counter bore.
3. The vacuum carrier roller cylinder drilling structure as claimed in claim 2, wherein: the counter bore is a cylindrical counter bore.
4. The vacuum carrier roller cylinder drilling structure as claimed in claim 2, wherein: the counter sink is a taper hole, one end of a small opening of the taper hole is connected with a stainless steel roller body drilled hole, and the diameter of the counter sink is consistent with that of the stainless steel roller body drilled hole.
5. The vacuum carrier roller cylinder drilling structure as claimed in claim 2, wherein: the diameter of the countersunk hole is gradually increased from the inner part of the stainless steel roller body to the outer part, the countersunk hole is cylindrical at the joint with the surface glue drilling hole, and the diameter of the smallest end of the countersunk hole is consistent with the diameter of the stainless steel roller body drilling hole.
6. The vacuum carrier roller cylinder drilling structure as claimed in any one of claims 1 to 5, wherein: the inner diameters of the surface glue drilling hole and the stainless steel roller body drilling hole are both 3-3.7 mm.
7. The vacuum carrier roller cylinder drilling structure as claimed in any one of claims 1 to 5, wherein: the aperture of the connecting end of the transition port and the surface glue drilling hole is 4-6 mm.
8. The vacuum carrier roller cylinder drilling structure as claimed in claims 1-5, wherein: the preparation method of the vacuum roller barrel comprises the following steps: after the stainless steel roller body of the vacuum carrier roller is drilled, coaxial counter bores are processed on the surface of the stainless steel roller body drilled hole, surface glue drilled holes with the diameter being the same as or slightly smaller than that of the stainless steel roller body drilled hole are drilled in the surface glue, and the positions of the drilled holes are communicated with the counter bores.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210169649.0A CN114411440A (en) | 2022-02-23 | 2022-02-23 | Vacuum carrier roller barrel drilling structure and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210169649.0A CN114411440A (en) | 2022-02-23 | 2022-02-23 | Vacuum carrier roller barrel drilling structure and preparation method thereof |
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| Publication Number | Publication Date |
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| CN114411440A true CN114411440A (en) | 2022-04-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210169649.0A Pending CN114411440A (en) | 2022-02-23 | 2022-02-23 | Vacuum carrier roller barrel drilling structure and preparation method thereof |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0328739A (en) * | 1989-06-26 | 1991-02-06 | Kubota Corp | Method for testing drill workability of suction roll shell for paper making machine |
| DE10227848A1 (en) * | 2002-06-21 | 2004-01-08 | Voith Paper Patent Gmbh | De-watering drum for manufacture of paper, carton or tissue web has regular array of mantle apertures and parallel array of de-watering surface channels |
| DE102004034282A1 (en) * | 2004-07-15 | 2006-02-09 | Voith Paper Patent Gmbh | Screen suction roller for production of fibrous sheets, e.g. of paper or cardboard, having roller casing with boreholes, indentations and bridges, giving reduced marking of the sheets |
| CN202717999U (en) * | 2012-09-01 | 2013-02-06 | 潍坊凯信机械有限公司 | Vacuum roller squeezing device |
| CN202809375U (en) * | 2012-10-10 | 2013-03-20 | 甘木林 | Papermaking vacuum press roll |
| CN105862488A (en) * | 2016-05-30 | 2016-08-17 | 许昌中亚工业智能装备股份有限公司 | Novel paper making machine vacuum support roller |
-
2022
- 2022-02-23 CN CN202210169649.0A patent/CN114411440A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0328739A (en) * | 1989-06-26 | 1991-02-06 | Kubota Corp | Method for testing drill workability of suction roll shell for paper making machine |
| DE10227848A1 (en) * | 2002-06-21 | 2004-01-08 | Voith Paper Patent Gmbh | De-watering drum for manufacture of paper, carton or tissue web has regular array of mantle apertures and parallel array of de-watering surface channels |
| DE102004034282A1 (en) * | 2004-07-15 | 2006-02-09 | Voith Paper Patent Gmbh | Screen suction roller for production of fibrous sheets, e.g. of paper or cardboard, having roller casing with boreholes, indentations and bridges, giving reduced marking of the sheets |
| CN202717999U (en) * | 2012-09-01 | 2013-02-06 | 潍坊凯信机械有限公司 | Vacuum roller squeezing device |
| CN202809375U (en) * | 2012-10-10 | 2013-03-20 | 甘木林 | Papermaking vacuum press roll |
| CN105862488A (en) * | 2016-05-30 | 2016-08-17 | 许昌中亚工业智能装备股份有限公司 | Novel paper making machine vacuum support roller |
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