CN204199103U

CN204199103U - Screen

Info

Publication number: CN204199103U
Application number: CN201290000740.XU
Authority: CN
Inventors: W.布雷特施耐德; C.斯坦马瑟
Original assignee: Voith Paper Patent GmbH
Current assignee: Voith Patent GmbH
Priority date: 2011-08-15
Filing date: 2012-07-30
Publication date: 2015-03-11
Anticipated expiration: 2022-07-30
Also published as: FI10522U1; DE102011080953A1; WO2013023899A1; AT13826U1; DE202011110440U1

Abstract

The utility model relates to the screen of a kind of applicable process for the manufacture of the fibrous suspension of paper web, board web, tissue webs or other fibrous cloth width, it has multiple sieve aperture (1,2), wherein, sieve aperture (1,2) minimum cross sectional dimensions is roughly the same, and the size of the sieve aperture of feed side (1,2) cross section is different.Improving screening effect and/or throughput when this thus when guaranteeing the screen stability needed, making the sieve aperture (2) at feed side with large cross section be had sieve aperture (1) encirclement of less cross section at feed side more than four.

Description

Screen

Technical field

The utility model relates to a kind of applicable process for the manufacture of paper web, board web, the screen of the fibrous suspension of tissue webs or other fibrous cloth width, described screen has multiple sieve aperture, wherein, the size of the minimum cross-section of sieve aperture is roughly the same, different in the size of the sieve aperture cross section of feed side.

Background technology

This screen is preferred for wet screening and selects fibrous suspension, to remove the impurity wherein existed.This screen is generally rigidity and is different from that use in pulp screen and paper machine, flexible Endless screen with this.

The characteristic of this screen obtains from the size of the sieve aperture be arranged in wherein, shape and quantity substantially.Sieve aperture is generally little than the material that will sift out.

If advantageously such as pulper, secondary pulper and for prepare paper fiber suspension screening machine in use this screen, wherein, it has and retains the task of impurity.

For the applicable cases that some especially occur in papermaking and pulp industry, this screen should have screening characteristics, this screening characteristics depending on material roughness such as by between 0.8 to 30mm circular port realize.

Certain people are also devoted to, and realize throughput large as far as possible in this screen, that is a large amount of as far as possible should by this some holes by the material stopped.This can be met by there is hole as much as possible.In general, people strive for free compass screen surface large as far as possible as possible, with regard to the whole surface of screen element.

Further requirement is the intensity of relatively high hydraulic pressure resistant.This screen element is used in production and operation, wherein, also there will be interference, this cause screen element different and sizable pressure loading.Because can not obstruction be got rid of, thus quite high pressure and in corresponding large face very high power can act on the surface of this screen element.The power of this increase must be born by screen, and occurs without any damage.

Therefore, in WO2010/108746, advise a kind of screen at feed side with different size cross section.But the embodiment wherein described can't be satisfied the demand completely.

Summary of the invention

Therefore, technical problem to be solved in the utility model improves screening effect and/or throughput when guaranteeing the sieve stability needed.

By the utility model, this technical problem solves thus, and the sieve aperture at feed side with large cross section is surrounded by the sieve aperture having a less cross section at feed side more than four.

Thus, widened by sieve aperture layout closely with the relatively little opening surface that just can realize screen that expends, and can not the stability of apparent damage screen.

The raising of this amount of resulting through, thus advantageously affect energy consumption.

But the utility model also achieves minimum sieve aperture less in identical throughput situation to improve screening effect.

The sieve aperture at feed side with large cross section ensures eddy current, and this equally advantageously affects throughput and maximum density of material.

Because the sieve aperture at feed side with large cross section is surrounded by the sieve aperture having little cross section more than four at this, not only increase the density of sieve aperture, but also significantly improve the possibility of its special arrangement.

Enough wall thickness (thickness) should must be had for the reason of intensity for the treatment of the screen of fibrous suspension.

Especially, herein in typical especially size range, for the sieve aperture such as between 0.8 and 20 millimeter, particularly advantageous method can be adopted, such as punching press or laser cutting.This generally causes producing the cost more less than the situation of holing in employing.Other methods for the formation of hole are: milling, and water sprays cutting, and etching is corroded, and electrochemistry is holed, and stream is drilled to type or broaching.

At this, also can be easier to form sieve aperture, whether rotational symmetric its cross section is: such as elongated hole, rectangle, rhombus, hexagon or other the polygon with rounding.This can provide special advantage when wet sieving fibrous suspension.

In addition, in numerous applications also advantageously, sieve aperture is widened on the percolation direction of liquid to be sieved.

Even if this can implement in cylindrical hole or in cross sections different with it.

When the sieve aperture that feed side has a large cross section is surrounded by five to eight sieve apertures that preferably six feed sides have less cross section, obtain the optimum utilization of the septa width between sieve aperture at this.In six sieve aperture situations, best utilization can be realized best, symmetrical layout and stability.

Particularly advantageously, in six sieve aperture situations, the distance between adjacent sieve aperture can be equal.

When the sieve aperture of 1/3rd has large cross section, completely enough for forming eddy current at feed side at this.Which reduce manufacturing expense and guarantee the stability that screen is enough.

Will be advantageous that, between the sieve aperture at two feed sides with large cross section, there is the sieve aperture that multiple feed side has less cross section correspondingly.

Consider few manufacturing expense, sieve aperture should have circular cross section and the sieve aperture that feed side has large cross section is widened towards feed side taper shape.At this, the angle between conical walls and percolation direction is advantageously between 30 ° to 60 °.

But also can form the great-jump-forward widening portion with such as cylindrical shape.

Strengthen the eddy current on the feed side of screen thus, the raising of this amount of resulting through.In addition, improve maximum density of material thus, screen can with this maximum density of material work.

Therefore, the vortex generator of the additional such as trouble flow strip form on sieve surface can be saved, obtain the saving of cost and energy thus.

In order to eddy current formation or screening characteristics are mated with special installation situation, will be advantageous that, have in the sieve aperture of large cross section at feed side, or the center of large cross section consistent with the center of each minimum cross-section, the center of large cross section and the off(-)center of each minimum cross-section.

If off(-)center, then for the same reason advantageously, can have all sieve apertures of large cross section for feed side, off(-)center in a same direction or in a different direction.

In order to the screening effect utilizing compass screen surface best and balance as far as possible, sieve aperture should regularly to become multiple parallel row to arrange with sieve aperture side by side.At this, if the sieve aperture of adjacent column misses one another, the density of sieve aperture under most cases, can also be improved.

In order to strengthen forming eddy current on feed side, the sieve surface structure of feed side has profile.This by the applying of welding bead or relatively simply can realize by laser.

This screen is generally smooth, but it also can be such as bearing shell shape or cylindrical basket.

Accompanying drawing explanation

Followingly set forth the utility model further by multiple embodiment.In accompanying drawing:

Fig. 1 a and Fig. 1 b: the top view being each screen local;

Fig. 2: be the cross section by screen cutting;

Fig. 3 a and Fig. 3 b: be two other screen local top view and

Fig. 4: be other screen Local map.

Detailed description of the invention

Screen can be made up of one or more layers, wherein, preferably uses anti abrasive material, especially metal.

Compass screen surface comprises multiple equally distributed as far as possible sieve aperture 1,2 at this, and sieve aperture has identical minimum cross-section to guarantee identical screening effect.

In order to realize large sieve aperture density therefore realize large throughput, the sieve aperture 2 that feed side has a large cross section is as in figures 1 and 4 by six or---surrounded by the sieve aperture 1 that eight have a less cross section at feed side as shown in FIG. 3---.

The cross section of all sieve apertures 1,2 is formed by circle.

But also there is the sieve aperture 1 extended by the cylinder of Fig. 2 and the sieve aperture 2 widened towards feed side 5 taper shape from shell portion.

Taper shape is widened and is provided in the sieve aperture 2 that feed side has large cross section, and this ensures also therefore to improve throughput at the eddy current of feed side.

As can be seen in the drawings, all adjacent sieve apertures 1,2 have equal distance (between the center of sieve aperture) to each other, which ensure that to effectively utilize compass screen surface when higher stability.

At this, sieve aperture 1,2 arrange with parallel row 3,4.

Flow through from feed side 5 by fibrous suspension at this such as smooth screen.Larger impurity retains at this and such as can remove by remover on feed side 5.

When the thickness of screen is herein between 3 to 30mm, the cone 6 of sieve aperture 2 has the degree of depth of 0.5 to 5mm.The minimum diameter of, sieve aperture 1,2 vital to screening effect is between 0.8 to 30mm.

In the embodiment pressing Fig. 2, the sieve aperture 1 at feed side with less cross section can have identical on the whole thickness of screen, cylindrical cross section.But when needed, this cylindrical cross section can be widened towards exit side.

Even if in conical sieve aperture 2, streamwise 7 is also adjacent after cone 6 cylindrical section, and this cylindrical section can be widened equally at exit side.

For this reason, Fig. 2 illustrates at exit side cross section with cone or the more large cylinder shape possible modification of widening.

Six sieve apertures 1 having a less cross section at feed side are centered around the layout that feed side has a sieve aperture 2 of larger cross section to be caused, and sieve aperture 1,2 arrange with parallel row 3,4 with missing one another.Correspondingly, row 3,4 also can intersect on out of plumb ground.In addition, there is Distance geometry between center that the center of the sieve aperture 2 of large cross section and six surround the sieve aperture 1 of sieve aperture 2 distance between these six sieve apertures 1 at this such as equal and opposite in direction at feed side.

Always between the sieve aperture 2 that two feed sides have large cross section, there is the sieve aperture 1 that feed side has less cross section in fig 1 a, and in Figure 1b, the section constructed in the same manner is by finding the region of the sieve aperture 1 with less cross section to interrupt.

For the sieve aperture 2 at feed side with large cross section shown in Fig. 1 to 3, the center of large cross section is consistent with the center of minimum cross-section.

In the form of implementation of pressing Fig. 4, Liang Ge center misses one another.

Fig. 3 differently illustrates with it two kinds of layouts, and wherein, the sieve aperture 2 at feed side with large cross section is surrounded by the sieve aperture 1 that eight have a less cross section at feed side.At this, sieve aperture 1, the row 3 of 2,4 vertically intersect.Correspondingly, the sieve aperture 2 at feed side with large cross section is such as unequal to eight distances at feed side with the sieve aperture 1 of little cross section of surrounding sieve aperture 2..

In fig. 3 a, always between the sieve aperture 2 that two feed sides have large cross section, there is the sieve aperture 1 that feed side has less cross section.Correspondingly, in fig 3b, the section constructed in the same manner is interrupted by the region that feed side can only be found to have the sieve aperture 1 of less cross section equally.

Claims

1. one kind is applicable to process for the manufacture of paper web, the screen of the fibrous suspension of board web, this screen has multiple sieve aperture (1,2), wherein, sieve aperture (1,2) size of minimum cross section is roughly the same, and the size of sieve aperture (1, the 2) cross section of feed side is different, it is characterized in that, the sieve aperture (2) at feed side with large cross section is had sieve aperture (1) encirclement of less cross section at feed side more than four.

2., by screen according to claim 1, it is characterized in that, described paper web comprises tissue webs.

3. by screen according to claim 1, it is characterized in that, the sieve aperture (2) at feed side with large cross section is had sieve aperture (1) encirclement of less cross section at feed side by five to eight.

4. by screen according to claim 3, it is characterized in that, the sieve aperture (2) at feed side with large cross section is had sieve aperture (1) encirclement of less cross section at feed side by six.

5., by screen according to claim 1, it is characterized in that, the sieve aperture (2) of maximum 1/3rd has large cross section at feed side.

6. by screen according to claim 1, it is characterized in that there is the sieve aperture (1) that multiple feed side has less cross section between two sieve apertures (2) that feed side has a large cross section.

7., by screen according to claim 1, it is characterized in that, described sieve aperture (1,2) has circular cross section.

8., by screen according to claim 1, it is characterized in that, the sieve aperture (2) that feed side has large cross section is widened towards feed side taper shape.

9., by screen according to claim 1, it is characterized in that, have in the sieve aperture (2) of large cross section at feed side, the center of described large cross section is consistent with the center of each minimum cross-section.

10., by screen according to claim 1, it is characterized in that, for the sieve aperture (2) at feed side with large cross section, center and described each minimum cross-section of described large cross section misplace.

11., by screen according to claim 10, is characterized in that feed side being had to the off(-)center of all sieve apertures (2) of large cross section all in a same direction.

12. by screen according to claim 10, it is characterized in that, for have at feed side large cross section sieve aperture (2) off(-)center in a different direction.

13. by screen according to claim 1, and it is characterized in that, described sieve aperture (1,2) is regularly to become multiple parallel row (3,4) to arrange with sieve aperture (1,2) side by side.

14. by screen according to claim 13, and it is characterized in that, the sieve aperture (1,2) of adjacent column (3,4) misses one another.

15. by screen according to claim 1, and it is characterized in that, the described sieve surface structure at feed side has profile.

16. by screen according to claim 1, and it is characterized in that, described screen is smooth.

17. by screen according to claim 1, and it is characterized in that, described screen is configured to cylinder.