KR970008599B1 - Means for controlling wire in a paper machine or cardboard machine - Google Patents

Abstract

A means for controlling wires in a twin-wire section in a paper or cardboard machine where the wires run one over the other for dewatering stock that is present between the wires, where a dewatering box is provided on one side of the wires and where a number of strips disposed side by side are provided on the other side of the wires, said strips running across the transport direction of the wires and over the total width of the wires, and where the strips have been arranged to be pressed against the wire lying closest to the strips, with the aid of pressure elements, where said pressure elements are disposed to act between the strips and a supporting table or equivalent, said supporting table being fixedly mounted relative to said dewatering box. The invention is characterized in that for each strip (16) has been provided a separate pressure element (15), where every one of the pressure elements (15) comprises at least two force-supplying members (19,20) provided between the respective strip and the supporting table (13), said members (19,20) being disposed to displace the strip (16) in the direction toward and away from said dewatering box , that a first one (19) of the members has been disposed to act against the forward end (25) of the strip in the transport direction of the wires and that a second one (20) of the members has been disposed to act against the rear end (28) of the strip in said transport direction, and that the force-supplying members (19,20) are individually controllable so that on one hand the pressure of the strip (16) against the wire and on the other hand the angle of the top surface of the strip against the wire can be adjusted.

Description

Means of controlling wires in paper machines or cardboard machines

1 is a cross-sectional view showing a double wire portion of the paper machine to which the present invention is applied.

FIG. 2 is an enlarged cross-sectional view showing one strip and the auxiliary control member according to the invention in a cross section coinciding with the cross section in FIG.

3 is an enlarged view showing a part of the auxiliary control member on the left side of FIG.

4 is a cross-sectional view showing a first modified embodiment of the auxiliary control member in a cross section coinciding with the cross section in FIG.

FIG. 5 is a cross-sectional view showing a second modified embodiment of the auxiliary control member in a section consistent with the cross section in FIG.

6 and 7 are schematic cross-sectional views of various embodiments of a force supply member taken along line A-A of FIG.

* Explanation of symbols for main parts of the drawings

2: upper wire 3, 4, 5, 6: roll forward

7: lower wire 8: inlet

9: conveying direction 10: dehydration box

11: conduit 12: bottom

13: support table 14: stand

15: pressure member 16, 31, 32: strip

18: groove 19, 20, 21, 22, 23, 24: power supply member

33: support heel 37: fixed member

I, II, III: chamber

The present invention relates to means for controlling wires in paper machines or paperboard machines.

More specifically, the present invention relates to the control of a wire in a twin-wire section in which the wire runs up and down in parallel and the papermaking material is introduced and dehydrated between these wires. Typically, a dehydration box is installed above the upper wire, and a partial vacuum is spread in the dehydration box to draw water squeezed from the papermaking material. Underneath the lower wire is a support table or its equivalent fixed to the dehydration box.

In this type of machine, it is desirable and necessary to be able to change the thickness of the gap formed between the wires on the one hand and to change the space shape of the gap in the conveying direction of the wire on the other hand.

For this purpose, a control member is provided which presses the lower wire upwards toward the upper wire lying against the dehydration box.

In other words, the control member acts between the support table and the lower wire.

Swedish Patent No. 8501985.9 and its corresponding German Patent No. 3,406,217 have a plurality of strips which are placed side by side closely and extending over the full width of the wire, these strips against the lower wire and against the lower wire A wire control track is disclosed in which the pressure of the strip being pressed can be adjusted. The strip may be moved towards the lower wire and away from the wire, but the angle of the top surface of the strip against the conveying surface of the wire is not adjustable.

The problem solution described in Swedish Patent No. 8501985.9 has the disadvantage that the strips must be placed in close integration. This results in the strips interacting through friction, which interrupts control. This obstruction is further aggravated by the fact that the top surface of the strip is not completely parallel to the conveying surface of the wire by having a tendency for the strip to be inclined due to friction with the lower wire. In addition, the liquid cannot be discharged downward in the above means unless the strip is configured to have a suction slit or an equivalent thereof.

German Patent No. 3,153, 305 discloses another wire control track which is provided with a plurality of spaced apart strips against the lower wire. In these strips, the pressure that is pressed against the lower wire is separately controlled by the spring member. However, since each strip is pivotally connected to a spring member assigned to a particular strip, the position of the strip top surface relative to the horizontal plane is not adjustable. That is, according to this German patent, due to the friction between the lower wire and the strip, it is impossible to compensate for the position of the inclined strip top surface with respect to the surface of the lower wire.

Accordingly, several solutions are known in the art for adjusting the pressure pressed against the wire and thereby adjusting the pressure pressed against the papermaking material.

In order to obtain the optimum functionality associated with dewatering the papermaking material in the double wire portion, it has been found that the pressure for pressing the strip front end in the conveying direction and the pressure for pressing the rear end thereof can be adjusted separately.

By doing so, any desired pressure profile can be set for each strip. It can also be excluded to be inclined as stated.

The present invention discloses means which enable to achieve what has just been described.

In addition, the configuration of such means is simple and robust.

That is, the present invention, the two wires are arranged to run up and down to dewater the papermaking material between them, a dehydration box is installed on one wire and a plurality of strips arranged side by side on the other wire is installed The strips are arranged so as to be spaced apart parallel to each other and travel across the full width of the wire across the conveying direction of the wires, the strips being arranged to be pressed against the wires positioned most adjacent thereto by the pressure members, Means for controlling the wire in a double wire section of a paper machine or paperboard machine, which is arranged to act between a support table or its equivalent fixedly mounted to the dehydration box and the strip, the means being connected to each strip. Separate members are installed, and each pressure member has its own strip and support table Two or more force supply members disposed therebetween, the force supply members being arranged to move the strip in a direction toward the dehydration box and away from the dewatering box, the first member of the force supply member being a wire; The second member of the force supply member is arranged to act against the strip rear end in the conveying direction of the wire, and the force supply member is pressed against the wire on the one hand. The pressure of the strip can be adjusted and on the other hand it can be controlled separately so that the angle of the top surface of the strip with respect to the wire can be adjusted.

Hereinafter, with reference to the accompanying drawings showing embodiments of the present invention will be described in more detail the present invention.

In FIG. 1, the double wire part 1 of the papermaking machine is shown in elevation, in which the upper wire 2 is traveling through the turning rolls 3, 4, 5, and 6 in this heavy wire part 1; , The lower wire 7 runs below the upper wire 7 substantially parallel to the upper wire 7. These wires 2, 7 form a wedge shaped inlet 8 into which the papermaking material is gradually compressed. Also shown in FIG. 1 are a number of actuation setting members, which are of a type known in the art and are not described in detail.

Subsequent to the wedge-shaped inlet 8, a dewatering run is provided in the conveying direction 9, which dewatering box 10 comprises three chambers I, II and III with different degrees of vacuum. ). Water from the papermaking material is withdrawn into the chamber by conduit 11. The conduit 11 enters the bottom 12 of the dehydration box 10, and the top wire 7 runs against this bottom 12.

Underneath the lower wire 2, a support table 13 fixedly mounted to the dehydration box 10 is provided, which is held on the stand indicated by reference numeral 14 as a whole.

A control member in the form of a plurality of pressure members 15 is provided on the support table 13, and these pressure members 15 respectively press the strips 16 upwards in FIG. 1 so that the strips 16 are lower wires 2. ) Against the paper, thereby placing the pressure against the papermaking material.

That is, the pressure member 15, one of which is shown enlarged in FIG. 2, is disposed between the lower side of the strip 16 and the support table 13. As mentioned above, the strip top face is arranged to rest against the lower wire 7.

The strip 16 has a groove 18 for draining water from the papermaking material.

According to the invention, a separate pressure member 15 is provided for each strip 16, each pressure member 15 having two or more forces between each strip 16 and the support table 13. Supply members 19, 20, 21, 22, 23, 24. The force supply members 19-24 are arranged to move the strip in the direction toward the dewatering box 10 and in a direction away from the dewatering box 10. The first members 19, 21, 23 of the force supply members are arranged to act against the front ends of the respective strips 16, 31, 32 in the conveying direction of the wire, and the second members 20, 23, of the force supply members. 24 is arranged to act against the rear end of each strip 16, 31, 32 in the conveying direction of the wire.

In addition, the force supply members 19-24 may be separately controlled such that the pressure of the strip being pressed against the lower wire on the one hand may be adjusted and on the other hand the angle of the strip top surface relative to the lower wire may be adjusted. .

According to a suitable embodiment, the strips 16, 31, 32 are spaced apart from one another and arranged parallel to one another. The spacing between the strips is only part of the strip width in the direction of transport of the wires.

By this, it can be ruled out that the strips are stuck to each other or placed in close contact with each other, such as in the case where the strips are arranged very closely to each other, thereby affecting each other.

In other words, the present invention clearly obviates the disadvantages of the prior art means mentioned at the outset.

Thus, the present invention allows each strip to be individually adjustable so that the control track of the double wire portion can be optimally controlled.

According to a particularly suitable embodiment of the invention, the force supply member has a rubber bellows or its equivalent arranged to be controlled by compressed air.

FIG. 2 shows a first embodiment of the present invention corresponding to the embodiment shown in FIG.

According to the present embodiment, the support table 13 has a supporting heel 33 mounted on the holding frame 34 of the support table 13.

According to the embodiment shown in FIG. 2, each of the force supply members consists of rubber bellows 19, 20, and the rubber bellows 19, 20 are wedge shaped when viewed in a cross section transverse to the longitudinal direction of the pressure member. And are arranged face to face up and down with each other to form a substantially rectangular pillow together between the strip 16 and the support table 13.

The rubber bellows is suitably made of fibre-reinforced rubber or materials with equivalent properties.

A plate-shaped fixing member 37 is provided between both side surfaces 35 and 36 of the bellows 19 and 20 facing each other. One edge 38 of the fixing member 37 is integrally connected to the support table 13 (33), and the other edge 39 of the fixing member 37 is integrally connected to the strip 16.

In FIG. 3, the fixing part on the left side of FIG. 2 is shown in an enlarged view. 3 also shows that the left edge of the lower bellows 20 is fixed in position by threaded engagement with the support table 13. Reference numeral 40 denotes a plastic or metal clamp, and reference numeral 41 denotes a screw.

The fixing member may also be made of fiber reinforced rubber, but may also be made of sheet metal.

2 schematically shows the nipples 42, 42 ′ for introducing compressed air into the bellows 19, 20 and for discharging from the bellows 19, 20 by dashed lines. These nipples 42, 42 'are preferably arranged at each end of the bellows.

When compressed air is introduced into the bellows 19 until the pressure in the bellows 19 is higher than the pressure in the bellows 20, the left end of the strip 16, ie the front end thereof, is the right end of the strip 16, It is obvious that it will rise above its rear end. This is illustrated by dashed line 43 in FIG.

The surface of the bellows adjacent the lower side of the strip 16 and the upper side of the support heel 33 is suitably attached to their respective surfaces. This can be done by mechanical bonding or by bonding the bellows to its respective surface by a binder.

Other suitable embodiments are shown in FIGS. 4 and 5.

According to these embodiments, the respective strips 31 and 32 and the support tables 44 and 45 are partially enclosed by each other, thus providing support for the support tables 44 and 45 of the strips 31 and 32. Mobility is bound to be limited. This embodiment eliminates the need for the fastening members of the type just described in connection with the second figure.

According to the embodiment shown in FIG. 4, there are provided additional bellows 46, which house two bellows 21, 22 as described above. These inner bellows 21, 22 are fixed to the outer bellows 46, and the outer bellows 46 itself is suitably attached to the strip 31 and the support table 44 by mechanical bonding or bonding by a binder. .

Conduits used for the introduction and exhaust of compressed air are provided in the respective inner bellows 21, 22.

As can be seen from FIG. 4, the strip is only moved over a very short distance in the lateral direction of FIG. 4. Further, the strip is limited but moved in the up and down direction of FIG. 4 over a longer distance than the travel distance in the left and right directions. In fact, there is no room for the strip to move in the left and right directions. The opening gap between the strip and the support table is merely to make it easier to move the strip in the vertical direction and adjust the inclined position of the strip top surface.

Conduits 49 are to be provided which communicate between the external bellows and the external atmosphere. However, as an alternative, the ends of the outer bellows may be open.

5 shows an embodiment corresponding to the embodiment of FIG. 4, in which the two bellows 23, 24 belong to the strip 32 and the support table by the retaining members 50, 51. It is characterized by being fixed relative to (45).

According to this embodiment, the strip can likewise be limitedly moved relative to the support table. In addition, conduits 52 and 53 are installed for supply and discharge of compressed air.

According to the embodiments described in connection with FIGS. 4 and 5, it is also suitable for the bellows 21, 22, 46, 23, 24 to be made of fiber reinforced rubber material.

The strip is made of a specific material with adequate wear resistance.

According to the embodiment shown in FIG. 6, all bellows 19 have a length that matches the total length of the strip 16. However, according to another embodiment, one or two of the bellows holding the strip 16 consist of two or more bellows 19 ', 19' ', 19' '' arranged in succession in their longitudinal direction. Thus, as shown in FIG. 7, the bellows 19 ′, 19 ″, 19 ′ ″ together form the feed member with the strip 16 having a length equal to the total length. In this case, all bellows 19 ', 19 ", 19'" have nipples for supplying and discharging compressed air. Each bellows 19 ', 19' ', 19' '' can be adjusted separately.

This embodiment implies that it is possible to control the pressure distribution pattern over the amplitude of the wire 7.

According to another variant, the bellows extending over the entire length of the wire may be subdivided into different sections.

In the above, various exemplary embodiments have been described.

The bellows has a different shape than that shown in the cross-sectional views of FIGS. 2, 3 and 4 and can extend over a portion larger or smaller than that shown in the lower side of the strip and the upper side of the support table. Is self explanatory. In addition, the bellows can be made of a material suitable for the application, other than as described above.

Of course, the strip and support table can also be implemented differently than described above.

In addition, the fixing member 37 may form a spring member when made of metal.

It is, therefore, to be understood that the invention is not limited to the above-described embodiment, but may be modified within the scope of the following claims.

Claims (7)

Two wires are arranged to run up and down to dewater the papermaking material between them, a dehydration box is installed on one wire and a plurality of strips are arranged side by side on the other wire, and the strips are parallel to each other. Spaced apart and travel across the full width of the wire across the wire's conveying direction, the strip being arranged to be pressed against the wire placed most adjacent to it by the pressure member, the pressure member being fixed against the dehydration box. In the means for controlling the wire in a double wire section of a paper machine or paperboard machine, arranged to act between the installed support table and the strip, a separate pressure member 15 is provided for each strip 16; 31; 32. Each pressure member 15 is installed between each strip 16; 31; 32 and the support table 13; 44; 45. Two or more force supply members 19, 20; 21, 22; 23, 24, the force supply members 19, 20; 21, 22; 23, 24 being directed toward the dehydration box 10; Arranged to move the strips (16; 31; 32) in a direction away from the dehydration box (10), wherein the first member (19; 21; 23) of the force supply members is a strip in the feed direction (9) of the wire. Arranged to act against the front ends 25; 26; 27, and the second member 20; 22; 24 of the force supply member to act against the strip rear ends 28; 29; 30 in the direction of transport of the wire. And the force supply members 19, 20; 21, 22; 23, 24 can on the one hand adjust the pressure of the strip 16; 31; 32 which is pressed against the wire 7 and on the other hand the wire. Wire of the double wire part of the paper machine or cardboard machine, characterized in that it can be controlled separately so that the angle of the strip top surface relative to (7) can be adjusted. Control means. 2. Wire control means according to claim 1, characterized in that the force supply member (19, 20; 21, 22; 23, 24) has a rubber bellows or its equivalent arranged to be controlled by compressed air. 3. The two bellows (19, 20) have a wedge shape in the cross section transverse to the pressure member, and together form a substantially rectangular pillow together between the strip (16) and the support tables (13, 33). Wire control means characterized in that arranged to face up and down facing each other to form. 4. A plate-shaped fastening member 37 is provided between the two bellows 19, 20, and one side edge 38 of the fastening member 37 coincides with the support table 13. And the other edge portion (39) of the fixing member (37) is integrally connected to the strip (16). 5. The bellows according to claim 4, wherein the two bellows (21, 22; 23, 24) have an elliptical shape in cross section transverse to the longitudinal direction of the pressure member, respectively, on the strips (31; 32) and the support table (44; 45), respectively. And the strips 31 and 32 and the support table 44 and 45 are partly surrounded by each other so that the strips 31 and 32 can only be moved with respect to the support table 44 and 45 in a limited manner. Wire control means. 6. Wire control means according to any one of the preceding claims, characterized in that each bellows (21, 22; 23, 24) has a length that matches the total length of the strip (16). The two or more bellows (19 ', 19 ", 19'" together form a force supply member having a length that matches the total length of the strip (16). The wire control means, characterized in that arranged in succession in the longitudinal direction.

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