CA1335632C - Means for controlling wires in a paper machine or cardboard machine - Google Patents
Means for controlling wires in a paper machine or cardboard machineInfo
- Publication number
- CA1335632C CA1335632C CA000576547A CA576547A CA1335632C CA 1335632 C CA1335632 C CA 1335632C CA 000576547 A CA000576547 A CA 000576547A CA 576547 A CA576547 A CA 576547A CA 1335632 C CA1335632 C CA 1335632C
- Authority
- CA
- Canada
- Prior art keywords
- strip
- strips
- wires
- disposed
- bellows
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F9/00—Complete machines for making continuous webs of paper
-
- 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
- D21F1/48—Suction apparatus
-
- 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
- D21F1/36—Guiding mechanisms
- D21F1/38—Pads
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F9/00—Complete machines for making continuous webs of paper
- D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type
Landscapes
- Paper (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
- Inspection Of Paper Currency And Valuable Securities (AREA)
- Devices For Checking Fares Or Tickets At Control Points (AREA)
- Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
- Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
- Sewing Machines And Sewing (AREA)
Abstract
A device 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 longitudinal 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 an 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-applying 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 (10), that a first one (19) of the has been disposed to act against the forward end (25) of the strip in the longitudinal 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 longitudinal direction, and that the force-applying (19,20) are individually controllable so that on one hand the pressure of the strip (16) against the wireand on the other hand the angle of the top surface of the strip against the wirecan be adjusted.
Description
-2- 133~632 The present invention relates to a device for controlling mutual arrangement of wires in a paper making machine or in a cardboard making machine .
More specifically, the device relates to the controlling of wires in a twin-wire section where the wires run parallel, one above the other, and where stock is introduced between the wires to be dewatered. There is usually a dewatering box above the upper wire, partial vacuum prevailing in said dewatering box in order to draw up water that has been expressed from the stock. Under the lower wire is provided a supporting table or equivalent, which is fixed relative to the dewatering box.
It is desirable, and necessary, in machines of this kind to be able to change, on one hand, ~he thickness of the dewatering gap defined between the wires and, on the other hand, the configuration of said gap in the longitudinal direction of the machine.
To this purpose there are controlling members adapted to urge the lower wire upwards in a direction against the upper wire, which in its turn lies against the dewatering box.
It is thus understood that said controlling members act between the supporting table and the lower wire.
In Swedish Patent No. 8501985-9 and in its German equivalent No.
More specifically, the device relates to the controlling of wires in a twin-wire section where the wires run parallel, one above the other, and where stock is introduced between the wires to be dewatered. There is usually a dewatering box above the upper wire, partial vacuum prevailing in said dewatering box in order to draw up water that has been expressed from the stock. Under the lower wire is provided a supporting table or equivalent, which is fixed relative to the dewatering box.
It is desirable, and necessary, in machines of this kind to be able to change, on one hand, ~he thickness of the dewatering gap defined between the wires and, on the other hand, the configuration of said gap in the longitudinal direction of the machine.
To this purpose there are controlling members adapted to urge the lower wire upwards in a direction against the upper wire, which in its turn lies against the dewatering box.
It is thus understood that said controlling members act between the supporting table and the lower wire.
In Swedish Patent No. 8501985-9 and in its German equivalent No.
3,406,217 a wire controlling track is disclosed wherein is provided a number of strips positioned closely side by side and extending laterally across the wire width, said strips Iying against the lower wire and the pressure of said strips against the lower wire being adjustable. The strips are displaceable towards the lower wire and away therefrom, but the angle of the top~ surfaces of said strips against the wire plane is not adjustable.
The problem solution described in the Swedish Patent No. 8501985-9 is furthermore encumbered by the drawback that the strips lie close together.
This has the effect that the strips act frictionally engage each other, and proper control is therefore impeded. The strips tend to assume oblique position so that their top surfaces are not fully parallel to the plane of the wires, owing to friction against the lower wire. Moreover, liquid cannot escape downward unless the strips are designed to have suction slits or equivalent.
~"' ~
3 l33S632 In German Patent No. 3,153,305 another wire controlling track is disclosed wherein a number of mutually spaced strips are present, Iying against the lower wire. These strips are individually regulated as regards their pressure against the lower wire, with the aid of a spring member. However, each strip is pivotally connected with the spring member coordinated with the particular strip, and therefore the position of the top surface of the strips relative to the horizontal plane cannot be adjusted. Thus, according to this patent, t compensation of inclined position of the strips' top surfaces relative to the surface of the lower wire, owing to friction between the lower wire and the strips, cannot be achieved.
Thus, various attempts are known to adjust the pressure against the wire, and thereby against the stock.
It has been discovered that, in order to attain optimum functioning re~arding dewatering of stock in a twin-wire section, it is essential that the pressure against the forward end of the strips, as viewed in the longitudinal direction of run of the machine, and that against the rear end, thereof be separately adjustable.
This enables any desired pressure profile to be set up over each strip.
Furthermore, the inclined positioning mentioned above can be eliminated.
The present invention provides device by the aid of which it becomes possible to achieve what has just been said.
Furthermore, the construction of the device is simple and sturdy.
In general terms, the present invention provides a device for controlling mutual arrangement of wires of a dewatering gap in a twin-wire section of a paper or cardboard making machine in which machine the wires are adapted to run through the gap in a longitudinal direction one over the other to dewaterstock present in said gap;
a dewatering box being provided exteriorly of the gap, along and in contact with one of the wires;
a number of lateral strips being disposed exteriorly of the gap in a side by side arrangement, the strips having each a top surface disposed along and in contact with the other one of the wires, the strips extending over the entire width of said wires;
__ ~4~ 1335632 the strips being operatively associated with pressure elements arranged to pressed the strips against said other wire in a direction toward said dewatering box;
said pressure elements being disposed to act between the strips and a supporting table or an equivalent thereof, the said table being fixedly mounted relative to said dewatering box;
a separate pressure element being provided for each strip and comprising at least two force-applying members disposed between the respective strip and the supporting table;
a first one of the at least two force-applying members being disposed to act against a forward end of the respective strip as viewed in said longitudinal direction;
a second one of the force-applying members being disposed to act against a rear end of the strip as viewed in said longitudinal direction, the force-applying members being individually controllable;
whereby both the pressure of the respective strip against the respective wire and the angle of the top surface of the respective strip relative to the wire can be selectively adjusted.
The invention will now be described in detail by way of preferred embodiments, with reference to the attached, simplified, diagrammatic drawings. In the drawings:
Fig. 1 shows a sectional view of a twin-wire section of a paper making machine where the present invention is applied, the section being taken on a plane generally vertical and parallel with the longitudinal direction of the machine which, of course, coincides with the movement of the wires through the gap;
Fig. 2 shows, on larger scale, one strip and ancillary control members according to the invention, in section conforming to Fig. 1;
Fig. 3 shows, on an even larger scale, the portion of said control member which is on the left in Fig. 2;
Fig. 4 shows a first alternative embodiment of the control member, in a section corresponding to that of Fig. 1;
Fig. 5 shows a second alternative embodiment of the control member, in a section conforming to the section in Fig. 1; and ~5~ 133S632 Figs. 6 and 7 show further embodiments of force-applying members, the figures being schematic sections taken in a vertical plane corresponding to the section A-A in Fig. 2.
In Fig. 1 an elevational view is shown of a twin-wire section 1 of a paper machine, where the upper wire 2 runs over deflection rolls 3, 4, 5 and 6 and where the lower wire 7 runs substantially parallel with and under the lowermost run of the upper wire 2. The wires 2,7 define dewatering gap which includes a wedge-shaped entrance portion 8, where the stock is successively compressed. The longitudinal direction of the machine and of the run of the wires 2,7 through the gap is designated with an arrow 9. In Fig. 1 are also shown a multitude of set-up members, which are of a king known in the art and which therefore are not more closely described.
Proceeding in the longitudinal direction 9, and after said wedge-shaped entrance portion 8, the gap further includes a dewatering run, comprising a dewatering or suction box 10 containing three chambers 1, ll and lll, which are arranged to operate at different degrees of vacuum. Water from the stock is drawn up by ducts 11 into the chambers. The ducts 11 are included in the bottom 12 of the dewatering box 10. The upper wire 2 runs against this bottom.
Under the lower wire is provided a supporting table 13, mounted fixedly relative to the dewatering box 10, this table being carried on a stand generallydenoted with reference numeral 14.
Upon the supporting table 13 is provided a control member in the shape of a number of pressure elements 15 arranged to press transverse or lateral strips 16 (Fig. 2) upward in Fig. 1 to apply pressure against the lower wire 7, and thus against the stock in the gap.
These pressure elements 15, one of which is shown on a larger scale in Fig. 2, are thus placed between the underside of the strips 16 and the supporting table 13. As has been mentioned, the top surfaces of the strips have been disposed to lie against the lower wire 7.
The strips 16 are provided with grooves 18 for carrying off water from the stock.
According to the present invention, a separate pressure element 15 has been provided for each strip 16, each pressure element comprising at least two ~ -6- 13~5632 force-applying members 19,20;21,22;23,24, between the respective strip 16,31,32 and the supporting table 13. The members 19-24 are disposed to displace the strips in the direction toward and away from the dewatering box 10. A first one of the members 19;21;23 is disposed to act against the 5 forward end 25;26;27 of the respective strip 16,31,32 as viewed in the longitudinal direction 9 of the run of the machine, and a second one of the members 20;22;24, to act against the rear end 28;29;30 of the strip as t viewed in the same direction.
Furthermore, the force-applying members 19-24 are individually 10 controllable so that, on one hand, the pressure of the strip against the lower wire, and, on the other hand, the angle of the top surface of the strip with reference to the lower wire, can be adjusted.
According to a preferred embodiment, the strips 16,31,32 are placed parallel with and spaced from one another. The distance between the strips 15 amounts only to a fraction of the width of one strip.
Thus, the strips cannot affect each other by frictionally engaging each other or by abutting together, which would be the case if the strips were placed very close to each other. If such interference were to occur, the individual adjustment of the strips would be impeded.
The present invention therefore results in every strip being individually adjustable so that optimum control of the controlling track in the twin-wire section can be obtained.
According to a specifically preferred embodiment of the invention, the force-applying members comprise rubber bellows or equivalent, arranged to be controlled with the aid of compressed air.
In Fig. 2 is shown a first embodiment of the invention, corresponding to the embodiment depicted in Fig. 1.
According to this embodiment, the supporting table comprises a supporting heel 33, mounted on the carrying frame 34 of the supporting table 30 13.
According to the embodiment depicted in Fig. 2, each one of the force-applying members consists of a rubber bellows 19,20, where the two bellows 19,20, seen in the transverse are wedge-shaped and are placed against and .~
~7~ 1335632 upon each other so that together they constitute a substantially rectangular pillow between the strip 16 and the supporting table 13.
The rubber bellows are preferably made of fabric-reinforced rubber, or of material having equivalent properties.
Between the sides 35,36 of the bellows 19,20 which face each other is provided a fixing element 37 in the shape of a plate. One end portion 38 of the fixing element is fixedly secured to the supporting table 13(33), and the t other end portion 39 of the fixing element is integrally connected with the strip 16.
In Fig. 3, the securement on the left in Fig. 2 is shown on an enlarged scale. Fig. 3 also shows the left margin of the lower bellows 20 fixed in place with a threaded joint to the supporting table. The reference numeral 40 indicates a clamp of plastic or metal and numeral 41, a screw.
The fixing element may likewise be made of fabric-reinforced rubber, but it may also be made of sheet metal.
In Fig.2, broken lines schematically indicate nipples 42,42' for inlet and discharge of compressed air to the bellows 19,20. The nipples are preferably placed on the respective end of the bellows.
It is obvious that if compressed air is introduced in the bellows 19 up to the pressure higher in bellows 19 than in bellows 20, the left (forward) end of the strip 19, its forward end will be raised more than its right-hand (rear) end.
This is illustrated by the interrupted line 43 in Fig. 2.
Suitably, the surfaces of the bellows adjoining the underside surface of the strip 16 and the top surface of the supporting heel 33 have been affixed to the respective surface. This may be done with mechanical fasteners or by cementing the bellows to the respective surface.
In Figs. 4 and 5, other alternative preferred embodiments are shown.
According to these embodiments, the strip 31 ;33, and the supporting table 44;45, partly embrace each other so that the strip 31;32 has only a limited mobility relative to the supporting table 44;45. Due to this embodiment there is no need for any fixing element of the type just described in connectionwith Fig. 2.
According to the embodiment depicted in Fig. 4, a further bellows 46 has been provided which holds within itself the two bellows 21 and 22 already mentioned. These inner bellows 21,22 are fixed to the outer bellows 46, which in turn is secured to the strip 31, or to the supporting table 44, by means of mechanical fasteners or by cementing.
A duct for introduction and evacuation of compressed air is provided for 5 each inner bellows 21,22.
As can be seen in Fig.4, the strip is restrictedly displaceable over a very short distance in the left/right direction in Fig.4. The strip is further restrictedly ,, displaceable upward/downward in Fig. 4, over a longer distance than in the lef:/right direction. Actually, there is no desire to make the strip displaceable 10 in the left/right direction: the free play which is present between the strip and the supporting table is merely to facilitate the upward/downward displacement and inclined positioning of the top surface of the strip.
A duct 49 between the outer bellows and free atmosphere must be provided. As an alternative, the ends of the outer bellows may be open.
In Fig. 5 is shown an embodiment equivalent to that of Fig. 4, featuring two bellows 23,24 fixed in a support 50,51, for the strip 32, and a portion 45 belonging to the supporting table.
According to this embodiment, too, the strip is restrictedly displaceable relative to the supporting table. Ducts 52,53 have been provided for inlet and discharge of compressed air.
According to the embodiments described in connection with Figs. 4 and 5 as well, the bellows 21, 22,46,23,24 are preferably made of a fabric-reinforced rubber material.
The strips are made of a suitable wear-resistant material.
According to the embodiment, shown in Fig. 6, every rubber bellows 19 has a length generally corresponding to the total length of the respective strip16. However, according to another embodiment one bellows or both bellows carrying a strip 16 may consist of two or more bellows 19',19",19"' located after each other in a transverse row, so that the bellows 19',19",19"' in combination constitute a force-applying member having a length generally equal to the total length of the respective strip 16, see Fig. 7. In that case, every bellows 19',19",19"' is provided with a nipple for inlet and discharge of compressed air. Each bellows 19',19'',19''' is individually adjustable.
~`1 9 133~632 This embodiment implies that it is even possible to control the pressure profile across the width of the wire 7.
According to a further alternative embodiment, a long bellows extending over the entire width of the wire may be subdivided into different sections.
In the foregoing various exemplifying embodiments have been described.
It is obvious that the bellows may have other shapes and cover a greater or smaller part of the underside of the strips and of the top surface of the supporting table as seen in section according to Figs. 2, 3 and 4. Furthermore, the bellows may be made of elastomeric materials other than those mentioned in the foregoing and which are suitable in the application in hand.
It goes without saying that the strips may also be of other embodiments, as may the supporting table. Furthermore, the fixing element 37 may constitute a spring element in case it is made of metal.
Thus, it is to be appreciated that the present invention is not to be considered confined to the embodiments presented in the foregoing. We therefore wish to protect by Letters Patent which may issue on the present application all such embodiments which fall within the scope of our contribution to the art.
~.
The problem solution described in the Swedish Patent No. 8501985-9 is furthermore encumbered by the drawback that the strips lie close together.
This has the effect that the strips act frictionally engage each other, and proper control is therefore impeded. The strips tend to assume oblique position so that their top surfaces are not fully parallel to the plane of the wires, owing to friction against the lower wire. Moreover, liquid cannot escape downward unless the strips are designed to have suction slits or equivalent.
~"' ~
3 l33S632 In German Patent No. 3,153,305 another wire controlling track is disclosed wherein a number of mutually spaced strips are present, Iying against the lower wire. These strips are individually regulated as regards their pressure against the lower wire, with the aid of a spring member. However, each strip is pivotally connected with the spring member coordinated with the particular strip, and therefore the position of the top surface of the strips relative to the horizontal plane cannot be adjusted. Thus, according to this patent, t compensation of inclined position of the strips' top surfaces relative to the surface of the lower wire, owing to friction between the lower wire and the strips, cannot be achieved.
Thus, various attempts are known to adjust the pressure against the wire, and thereby against the stock.
It has been discovered that, in order to attain optimum functioning re~arding dewatering of stock in a twin-wire section, it is essential that the pressure against the forward end of the strips, as viewed in the longitudinal direction of run of the machine, and that against the rear end, thereof be separately adjustable.
This enables any desired pressure profile to be set up over each strip.
Furthermore, the inclined positioning mentioned above can be eliminated.
The present invention provides device by the aid of which it becomes possible to achieve what has just been said.
Furthermore, the construction of the device is simple and sturdy.
In general terms, the present invention provides a device for controlling mutual arrangement of wires of a dewatering gap in a twin-wire section of a paper or cardboard making machine in which machine the wires are adapted to run through the gap in a longitudinal direction one over the other to dewaterstock present in said gap;
a dewatering box being provided exteriorly of the gap, along and in contact with one of the wires;
a number of lateral strips being disposed exteriorly of the gap in a side by side arrangement, the strips having each a top surface disposed along and in contact with the other one of the wires, the strips extending over the entire width of said wires;
__ ~4~ 1335632 the strips being operatively associated with pressure elements arranged to pressed the strips against said other wire in a direction toward said dewatering box;
said pressure elements being disposed to act between the strips and a supporting table or an equivalent thereof, the said table being fixedly mounted relative to said dewatering box;
a separate pressure element being provided for each strip and comprising at least two force-applying members disposed between the respective strip and the supporting table;
a first one of the at least two force-applying members being disposed to act against a forward end of the respective strip as viewed in said longitudinal direction;
a second one of the force-applying members being disposed to act against a rear end of the strip as viewed in said longitudinal direction, the force-applying members being individually controllable;
whereby both the pressure of the respective strip against the respective wire and the angle of the top surface of the respective strip relative to the wire can be selectively adjusted.
The invention will now be described in detail by way of preferred embodiments, with reference to the attached, simplified, diagrammatic drawings. In the drawings:
Fig. 1 shows a sectional view of a twin-wire section of a paper making machine where the present invention is applied, the section being taken on a plane generally vertical and parallel with the longitudinal direction of the machine which, of course, coincides with the movement of the wires through the gap;
Fig. 2 shows, on larger scale, one strip and ancillary control members according to the invention, in section conforming to Fig. 1;
Fig. 3 shows, on an even larger scale, the portion of said control member which is on the left in Fig. 2;
Fig. 4 shows a first alternative embodiment of the control member, in a section corresponding to that of Fig. 1;
Fig. 5 shows a second alternative embodiment of the control member, in a section conforming to the section in Fig. 1; and ~5~ 133S632 Figs. 6 and 7 show further embodiments of force-applying members, the figures being schematic sections taken in a vertical plane corresponding to the section A-A in Fig. 2.
In Fig. 1 an elevational view is shown of a twin-wire section 1 of a paper machine, where the upper wire 2 runs over deflection rolls 3, 4, 5 and 6 and where the lower wire 7 runs substantially parallel with and under the lowermost run of the upper wire 2. The wires 2,7 define dewatering gap which includes a wedge-shaped entrance portion 8, where the stock is successively compressed. The longitudinal direction of the machine and of the run of the wires 2,7 through the gap is designated with an arrow 9. In Fig. 1 are also shown a multitude of set-up members, which are of a king known in the art and which therefore are not more closely described.
Proceeding in the longitudinal direction 9, and after said wedge-shaped entrance portion 8, the gap further includes a dewatering run, comprising a dewatering or suction box 10 containing three chambers 1, ll and lll, which are arranged to operate at different degrees of vacuum. Water from the stock is drawn up by ducts 11 into the chambers. The ducts 11 are included in the bottom 12 of the dewatering box 10. The upper wire 2 runs against this bottom.
Under the lower wire is provided a supporting table 13, mounted fixedly relative to the dewatering box 10, this table being carried on a stand generallydenoted with reference numeral 14.
Upon the supporting table 13 is provided a control member in the shape of a number of pressure elements 15 arranged to press transverse or lateral strips 16 (Fig. 2) upward in Fig. 1 to apply pressure against the lower wire 7, and thus against the stock in the gap.
These pressure elements 15, one of which is shown on a larger scale in Fig. 2, are thus placed between the underside of the strips 16 and the supporting table 13. As has been mentioned, the top surfaces of the strips have been disposed to lie against the lower wire 7.
The strips 16 are provided with grooves 18 for carrying off water from the stock.
According to the present invention, a separate pressure element 15 has been provided for each strip 16, each pressure element comprising at least two ~ -6- 13~5632 force-applying members 19,20;21,22;23,24, between the respective strip 16,31,32 and the supporting table 13. The members 19-24 are disposed to displace the strips in the direction toward and away from the dewatering box 10. A first one of the members 19;21;23 is disposed to act against the 5 forward end 25;26;27 of the respective strip 16,31,32 as viewed in the longitudinal direction 9 of the run of the machine, and a second one of the members 20;22;24, to act against the rear end 28;29;30 of the strip as t viewed in the same direction.
Furthermore, the force-applying members 19-24 are individually 10 controllable so that, on one hand, the pressure of the strip against the lower wire, and, on the other hand, the angle of the top surface of the strip with reference to the lower wire, can be adjusted.
According to a preferred embodiment, the strips 16,31,32 are placed parallel with and spaced from one another. The distance between the strips 15 amounts only to a fraction of the width of one strip.
Thus, the strips cannot affect each other by frictionally engaging each other or by abutting together, which would be the case if the strips were placed very close to each other. If such interference were to occur, the individual adjustment of the strips would be impeded.
The present invention therefore results in every strip being individually adjustable so that optimum control of the controlling track in the twin-wire section can be obtained.
According to a specifically preferred embodiment of the invention, the force-applying members comprise rubber bellows or equivalent, arranged to be controlled with the aid of compressed air.
In Fig. 2 is shown a first embodiment of the invention, corresponding to the embodiment depicted in Fig. 1.
According to this embodiment, the supporting table comprises a supporting heel 33, mounted on the carrying frame 34 of the supporting table 30 13.
According to the embodiment depicted in Fig. 2, each one of the force-applying members consists of a rubber bellows 19,20, where the two bellows 19,20, seen in the transverse are wedge-shaped and are placed against and .~
~7~ 1335632 upon each other so that together they constitute a substantially rectangular pillow between the strip 16 and the supporting table 13.
The rubber bellows are preferably made of fabric-reinforced rubber, or of material having equivalent properties.
Between the sides 35,36 of the bellows 19,20 which face each other is provided a fixing element 37 in the shape of a plate. One end portion 38 of the fixing element is fixedly secured to the supporting table 13(33), and the t other end portion 39 of the fixing element is integrally connected with the strip 16.
In Fig. 3, the securement on the left in Fig. 2 is shown on an enlarged scale. Fig. 3 also shows the left margin of the lower bellows 20 fixed in place with a threaded joint to the supporting table. The reference numeral 40 indicates a clamp of plastic or metal and numeral 41, a screw.
The fixing element may likewise be made of fabric-reinforced rubber, but it may also be made of sheet metal.
In Fig.2, broken lines schematically indicate nipples 42,42' for inlet and discharge of compressed air to the bellows 19,20. The nipples are preferably placed on the respective end of the bellows.
It is obvious that if compressed air is introduced in the bellows 19 up to the pressure higher in bellows 19 than in bellows 20, the left (forward) end of the strip 19, its forward end will be raised more than its right-hand (rear) end.
This is illustrated by the interrupted line 43 in Fig. 2.
Suitably, the surfaces of the bellows adjoining the underside surface of the strip 16 and the top surface of the supporting heel 33 have been affixed to the respective surface. This may be done with mechanical fasteners or by cementing the bellows to the respective surface.
In Figs. 4 and 5, other alternative preferred embodiments are shown.
According to these embodiments, the strip 31 ;33, and the supporting table 44;45, partly embrace each other so that the strip 31;32 has only a limited mobility relative to the supporting table 44;45. Due to this embodiment there is no need for any fixing element of the type just described in connectionwith Fig. 2.
According to the embodiment depicted in Fig. 4, a further bellows 46 has been provided which holds within itself the two bellows 21 and 22 already mentioned. These inner bellows 21,22 are fixed to the outer bellows 46, which in turn is secured to the strip 31, or to the supporting table 44, by means of mechanical fasteners or by cementing.
A duct for introduction and evacuation of compressed air is provided for 5 each inner bellows 21,22.
As can be seen in Fig.4, the strip is restrictedly displaceable over a very short distance in the left/right direction in Fig.4. The strip is further restrictedly ,, displaceable upward/downward in Fig. 4, over a longer distance than in the lef:/right direction. Actually, there is no desire to make the strip displaceable 10 in the left/right direction: the free play which is present between the strip and the supporting table is merely to facilitate the upward/downward displacement and inclined positioning of the top surface of the strip.
A duct 49 between the outer bellows and free atmosphere must be provided. As an alternative, the ends of the outer bellows may be open.
In Fig. 5 is shown an embodiment equivalent to that of Fig. 4, featuring two bellows 23,24 fixed in a support 50,51, for the strip 32, and a portion 45 belonging to the supporting table.
According to this embodiment, too, the strip is restrictedly displaceable relative to the supporting table. Ducts 52,53 have been provided for inlet and discharge of compressed air.
According to the embodiments described in connection with Figs. 4 and 5 as well, the bellows 21, 22,46,23,24 are preferably made of a fabric-reinforced rubber material.
The strips are made of a suitable wear-resistant material.
According to the embodiment, shown in Fig. 6, every rubber bellows 19 has a length generally corresponding to the total length of the respective strip16. However, according to another embodiment one bellows or both bellows carrying a strip 16 may consist of two or more bellows 19',19",19"' located after each other in a transverse row, so that the bellows 19',19",19"' in combination constitute a force-applying member having a length generally equal to the total length of the respective strip 16, see Fig. 7. In that case, every bellows 19',19",19"' is provided with a nipple for inlet and discharge of compressed air. Each bellows 19',19'',19''' is individually adjustable.
~`1 9 133~632 This embodiment implies that it is even possible to control the pressure profile across the width of the wire 7.
According to a further alternative embodiment, a long bellows extending over the entire width of the wire may be subdivided into different sections.
In the foregoing various exemplifying embodiments have been described.
It is obvious that the bellows may have other shapes and cover a greater or smaller part of the underside of the strips and of the top surface of the supporting table as seen in section according to Figs. 2, 3 and 4. Furthermore, the bellows may be made of elastomeric materials other than those mentioned in the foregoing and which are suitable in the application in hand.
It goes without saying that the strips may also be of other embodiments, as may the supporting table. Furthermore, the fixing element 37 may constitute a spring element in case it is made of metal.
Thus, it is to be appreciated that the present invention is not to be considered confined to the embodiments presented in the foregoing. We therefore wish to protect by Letters Patent which may issue on the present application all such embodiments which fall within the scope of our contribution to the art.
~.
Claims (8)
1. A device for controlling mutual arrangement of wires of a dewatering gap in a twin-wire section of a paper or cardboard making machine in which machine the wires are adapted to run through the gap in a longitudinal directionone over the other to dewater stock present in said gap;
a dewatering box being provided exteriorly of the gap, along and in contact with one of the wires;
a number of lateral strips being disposed exteriorly of the gap in a side by side arrangement, the strips having each a top surface disposed along and in contact with the other one of the wires, the strips extending over the entire width of said wires;
the strips being operatively associated with pressure elements arranged to pressed the strips against said other wire in a direction toward said dewatering box;
said pressure elements being disposed to act between the strips and a supporting table or an equivalent thereof, the said table being fixedly mounted relative to said dewatering box;
a separate pressure element being provided for each strip and comprising at least two force-applying members disposed between the respective strip and the supporting table;
a first one of the at least two force-applying members being disposed to act against a forward end of the respective strip as viewed in said longitudinal direction;
a second one of the force-applying members being disposed to act against a rear end of the strip as viewed in said longitudinal direction, the force-applying members being individually controllable;
whereby both the pressure of the respective strip against the respective wire and the angle of the top surface of the respective strip relative to the wire can be selectively adjusted.
a dewatering box being provided exteriorly of the gap, along and in contact with one of the wires;
a number of lateral strips being disposed exteriorly of the gap in a side by side arrangement, the strips having each a top surface disposed along and in contact with the other one of the wires, the strips extending over the entire width of said wires;
the strips being operatively associated with pressure elements arranged to pressed the strips against said other wire in a direction toward said dewatering box;
said pressure elements being disposed to act between the strips and a supporting table or an equivalent thereof, the said table being fixedly mounted relative to said dewatering box;
a separate pressure element being provided for each strip and comprising at least two force-applying members disposed between the respective strip and the supporting table;
a first one of the at least two force-applying members being disposed to act against a forward end of the respective strip as viewed in said longitudinal direction;
a second one of the force-applying members being disposed to act against a rear end of the strip as viewed in said longitudinal direction, the force-applying members being individually controllable;
whereby both the pressure of the respective strip against the respective wire and the angle of the top surface of the respective strip relative to the wire can be selectively adjusted.
2. The device of claim 1, wherein the strips are disposed parallel with and spaced from each other.
3. The device of claim 1, wherein said force-applying members comprise two inflatable bellows or an equivalent thereof adapted selectively to control the respective strip by inlet or removal of removal of air in or from the respective bellows.
4. The device of claim 3, wherein the two bellows are of a configuration such that in a section taken along a generally vertical plane parallel with saidlongitudinal direction, they are generally wedge-shaped and placed against and upon each other so that, together, they constitute a pillow having a substantially rectangular contour in said section, said pillow being disposed between the respective strip and the supporting table.
5. The device of claim 4, wherein a fixing element in the shape of a plate is provided between the two bellows, one end portion of said fixing element being located near one end of the respective strip and being fixedly secured to the supporting table, and the other end portion of said fixing element being located near the other end of the respective strip and being fixedly secured to the respective strip.
6. The device of claim 3, wherein the two inflatable bellows are of such a configuration that, in a section taken along a generally vertical plane parallel with the longitudinal direction, they have each a substantially oval shape and are fixedly secured to the strip and/or to the supporting table, the strip and the supporting table partly embracing each other to provide limits of movement of the strips relative to the supporting table.
7. The device of claim 3, wherein each bellows has a length generally equal to the total length of the strips.
8. The device according to claim 3, characterized in that two or more bellows are placed after each other in a transverse direction such that the bellows in combination constitute a force-applying member having a length generally equal to the total length of the respective strip.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE8703468-2 | 1987-09-07 | ||
| SE8703468A SE456590B (en) | 1987-09-07 | 1987-09-07 | DEVICE FOR CONTROL OF VIRUSES IN A PAPER MACHINE OR CARTON MACHINE |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1335632C true CA1335632C (en) | 1995-05-23 |
Family
ID=20369499
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000576547A Expired - Fee Related CA1335632C (en) | 1987-09-07 | 1988-09-06 | Means for controlling wires in a paper machine or cardboard machine |
Country Status (13)
| Country | Link |
|---|---|
| EP (1) | EP0306759B1 (en) |
| JP (1) | JP2691913B2 (en) |
| KR (1) | KR970008599B1 (en) |
| AT (1) | ATE66027T1 (en) |
| AU (1) | AU2303188A (en) |
| BR (1) | BR8807192A (en) |
| CA (1) | CA1335632C (en) |
| CH (1) | CH676257A5 (en) |
| DE (1) | DE3864105D1 (en) |
| ES (1) | ES2025747T3 (en) |
| FI (1) | FI90572C (en) |
| SE (1) | SE456590B (en) |
| WO (1) | WO1989002499A1 (en) |
Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3823966C2 (en) * | 1988-07-15 | 1995-03-16 | Voith Gmbh J M | Device for guiding the screens of a twin-wire section of a paper or board machine |
| FI885607A (en) * | 1988-12-01 | 1990-06-02 | Ahlstroem Valmet | ANORDNING FOER STYRNING AV VIROR I EN PAPPERSMASKINS FORMER. |
| US5389206A (en) * | 1989-08-22 | 1995-02-14 | J. M. Voith Gmbh | Twin wire former |
| DE3929265C2 (en) * | 1989-09-02 | 1997-05-07 | Voith Sulzer Papiermasch Gmbh | Strip for sheet formation zone of a paper machine |
| DE4026953C2 (en) * | 1990-01-26 | 1995-11-30 | Escher Wyss Gmbh | Dewatering device and method for dewatering on a twin wire former |
| DE4002304A1 (en) * | 1990-01-26 | 1991-08-14 | Escher Wyss Gmbh | Paper forming stretch |
| DE4005420C2 (en) * | 1990-02-21 | 1995-06-08 | Voith Gmbh J M | Twin wire former |
| DE4009628C2 (en) * | 1990-03-26 | 1994-11-03 | Voith Gmbh J M | Pressure medium support device |
| DE4014403C2 (en) * | 1990-05-04 | 1994-03-10 | Escher Wyss Gmbh | Vertical former |
| DE4019884A1 (en) * | 1990-06-22 | 1992-01-09 | Voith Gmbh J M | PERFORMANCE SUPPLY SUPPORT FOR A SCREENING BELT |
| DE4107653A1 (en) * | 1991-03-09 | 1992-09-10 | Escher Wyss Gmbh | DRAINAGE DEVICE FOR THE WET SECTION OF A PAPER MACHINE |
| FI920228A0 (en) * | 1992-01-17 | 1992-01-17 | Valmet Paper Machinery Inc | BANFORMNINGSPARTI FOER PAPPERSMASKIN. |
| FI103995B1 (en) * | 1993-06-17 | 1999-10-29 | Valmet Paper Machinery Inc | Method and apparatus and adjustment arrangement in a paper machine for controlling the transverse profile of a paper web |
| FI96623C (en) | 1994-08-31 | 1996-07-25 | Valmet Paper Machinery Inc | Double-wire molders, especially for fast paper machines |
| DE29504419U1 (en) * | 1995-03-15 | 1995-05-11 | Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim | Last unit for the flexible support of a paper machine belt |
| DE10333201A1 (en) * | 2003-07-22 | 2005-02-24 | Voith Paper Patent Gmbh | Papermaking dewatering double sieve belt passes over transverse pressure beam subdivided into equal segments with individual pressure control |
| JP6199136B2 (en) * | 2013-09-17 | 2017-09-20 | 三菱重工業株式会社 | Liquid solid matter take-out apparatus and liquid solid matter take-out method |
| DE202014103256U1 (en) * | 2014-07-15 | 2014-07-23 | Valmet Technologies, Inc. | Loading device for a machine for producing fiber webs |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3027940A (en) * | 1958-12-31 | 1962-04-03 | Lodding Engineering Corp | Adjustable supports for fourdrinier screen wires |
| US3357881A (en) * | 1964-10-15 | 1967-12-12 | Fitchburg Paper | Wire support for papermaking machines |
| US3772145A (en) * | 1971-03-31 | 1973-11-13 | Black Clawson Co | Pivotal mounting structures for vertical twin-wire papermaking machine |
| DE3406217C1 (en) * | 1984-02-21 | 1985-10-31 | O. Dörries GmbH, 5160 Düren | Apparatus for guiding the wire screens of a twin wire set of a paper making or board making machine |
| DE3503242A1 (en) * | 1985-01-31 | 1986-08-07 | O. Dörries GmbH, 5160 Düren | Device for guiding the wires of a twin-wire section of a paper- or cardboard-machine |
| GB2174120B (en) * | 1985-04-26 | 1988-08-10 | Doerries Gmbh | Apparatus for guiding the wires of a twin wire forming section of a paper or cardboard machine |
| FI861811A (en) * | 1986-04-30 | 1987-10-31 | Viljo Klemetti | FOERFARANDE FOER REGLERING AV TVAERSNITT PROFILEN HOS EN PAPPERSBANA SAMT EN ANORDNING FOER TILLAEMPNING AV FOERFARANDET. |
-
1987
- 1987-09-07 SE SE8703468A patent/SE456590B/en unknown
-
1988
- 1988-08-22 ES ES198888113618T patent/ES2025747T3/en not_active Expired - Lifetime
- 1988-08-22 EP EP88113618A patent/EP0306759B1/en not_active Expired - Lifetime
- 1988-08-22 DE DE8888113618T patent/DE3864105D1/en not_active Expired - Fee Related
- 1988-08-22 AT AT88113618T patent/ATE66027T1/en not_active IP Right Cessation
- 1988-09-06 CH CH1579/89A patent/CH676257A5/de not_active IP Right Cessation
- 1988-09-06 WO PCT/FI1988/000142 patent/WO1989002499A1/en unknown
- 1988-09-06 CA CA000576547A patent/CA1335632C/en not_active Expired - Fee Related
- 1988-09-06 FI FI884109A patent/FI90572C/en not_active IP Right Cessation
- 1988-09-06 AU AU23031/88A patent/AU2303188A/en not_active Abandoned
- 1988-09-06 BR BR888807192A patent/BR8807192A/en unknown
- 1988-09-07 KR KR1019880011537A patent/KR970008599B1/en not_active IP Right Cessation
- 1988-09-07 JP JP63224367A patent/JP2691913B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| BR8807192A (en) | 1989-10-17 |
| AU2303188A (en) | 1989-04-17 |
| EP0306759B1 (en) | 1991-08-07 |
| WO1989002499A1 (en) | 1989-03-23 |
| EP0306759A1 (en) | 1989-03-15 |
| JP2691913B2 (en) | 1997-12-17 |
| KR890005347A (en) | 1989-05-13 |
| ES2025747T3 (en) | 1992-04-01 |
| FI90572B (en) | 1993-11-15 |
| JPH01104895A (en) | 1989-04-21 |
| KR970008599B1 (en) | 1997-05-27 |
| CH676257A5 (en) | 1990-12-28 |
| FI90572C (en) | 1994-02-25 |
| SE456590B (en) | 1988-10-17 |
| FI884109A0 (en) | 1988-09-06 |
| FI884109A (en) | 1989-03-08 |
| ATE66027T1 (en) | 1991-08-15 |
| DE3864105D1 (en) | 1991-09-12 |
| SE8703468D0 (en) | 1987-09-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |