FI95938B - Calender for surface treatment of material tracks - Google PatentsCalender for surface treatment of material tracks Download PDF
- Publication number
- FI95938B FI95938B FI904759A FI904759A FI95938B FI 95938 B FI95938 B FI 95938B FI 904759 A FI904759 A FI 904759A FI 904759 A FI904759 A FI 904759A FI 95938 B FI95938 B FI 95938B
- Prior art keywords
- fixed roller
- Prior art date
- 239000000463 materials Substances 0.000 title claims description 4
- 238000004381 surface treatment Methods 0.000 title description 2
- 238000006073 displacement reactions Methods 0.000 claims description 4
- 238000007906 compression Methods 0.000 description 17
- 239000003921 oils Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000010720 hydraulic oils Substances 0.000 description 3
- 230000000875 corresponding Effects 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 240000007524 Camellia sinensis var. sinensis Species 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 239000004020 conductors Substances 0.000 description 1
- 230000001627 detrimental Effects 0.000 description 1
- 239000007788 liquids Substances 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 230000036633 rest Effects 0.000 description 1
- 239000007787 solids Substances 0.000 description 1
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G1/00—Calenders; Smoothing apparatus
- D21G1/002—Opening or closing mechanisms; Regulating the pressure
Calendar for surface treatment of material tracks
The invention relates to a calendar for handling material tracks, having at least one fixed roll 5 fixedly supported in the compression direction and at least one loose roll bearing freely movable in the compression direction.
Such calendars are well known. In particular, the bearing pins of the rollers are mounted in the longitudinal guides 10 to move freely in the compression direction by placing the rollers as loose rollers on the guides having a limited range of movement.
The problem here is that considerable frictional forces can be exerted on these guides, causing even more or less a clamping effect. For example, the expected compressive force at the pressing point of the fixed roll of the vertical calender may therefore be one-sided, too large, or too small, depending on whether the compressive force was reduced or increased. This results in compression forces deviating from the target values and / or oblique cross-sections of the compression forces at the compression points, the latter, because the frictions of the roller guides are not always the same.
The effect of these friction or jamming phenomena is. 25 efforts have often been made to alleviate the entire roll stack by artificially vibrating or moving. Attempts have also been made to produce additional loads of different magnitudes on the moving roll for the time that the desired compressive forces are generated on the fixed roll.
30 In this case, the actual value of the average line pressure or the line pressure cross-section taken as a measure of the polishing process was set to the desired value when the friction remained approximately constant. In many cases, however, it turned out that the measures just mentioned strengthened the friction up to a stuck jam. In all cases, the line pressures are distorted at the pressing points between the friction or jamming roll and the moving roll experiencing the additional load, which results in a considerable disturbance of the calendering.
It is therefore an object of the invention to provide a calendar by which the above-mentioned frictions and jams are avoided or at least their harmful effects can be eliminated in a simple and reliable manner, without having to substantially alter, for example, an existing fish.
The object is solved in the invention by a device for measuring the compression forces of the fixed roll 12, a device for moving the fixed roll in the compression direction, a device for comparing the compression forces target-15 and the measured actual values. The target value of the compressive force at the pressing point of the fixed roll consists of the parts of the gravitational forces of the parts moving above the fixed roll 20 acting on the compressive direction and the forces acting on the loose rollers.
The solution takes advantage of the idea that, in use, the roll otherwise thought of as a fixed roll is made at least 25 selectively movable from the end to the compression direction, depending on the support forces measured on the fixed roll, which are mainly determined by the compression forces. The principle usually works both up and down (vertical fish-blade) as well as in other positions of the rollers, for example 30 horizontally in a horizontal calendar. Additional load. can be produced either from top or bottom or from right or left.
By using the invention, the detrimental effects of frictional forces are eliminated not only from the stationary fixed roll 3 95938, but also from the pressing points between the fixed roll and the roll on which the harmful frictional force is generated.
According to the invention, it is not necessary to know which roll guides cause friction or jam.
5 The smallest combination is a unit made of a fixed roll and a loose roll.
Loose rollers with additional loads are also possible.
The fixed roll of a vertical calendar can be either the top 10 or the bottom roll.
The fixed calendar roll can be either extreme right or extreme left.
It is also possible to place a fixed roller in the middle of the calendar.
15 A fixed roll can be a deflection-compensated roll, the cover of which is rotatably mounted on the side by fixed supports (so-called NIPCO-K roll).
The fixed roll can also be a deflection-compensated roll, the cover of which moves along its entire length in the compression direction 20 and can be fixed to the desired position by means of a distance measuring device (so-called NIPCO-F roll with positioning adjustment).
The loose roll, which can produce additional loads, is preferably a deflection-compensated roll, the cover, 25 of which moves in the compression direction.
Gauge boxes or liquid or pneumatic pressures in roll load systems can be used to measure roller loads.
Lifting machines, piston systems or other mechanical equipment can be used to effect a change in the position of the ends of the fixed roll.
When a deflection-compensated fixed roll is used, the cover of which moves along its entire length in the compression direction and can be fixed to the desired position by means of a distance measuring device, said transfer can be performed by changing the position, for example by means of feed data of the roll cover positioning controller. Another conceivable measure is such that the distance is artificially reduced by the measuring device, which causes a correction.
Correction of the position of the fixed roll in the direction of or away from the friction-causing or jamming roll can be automated at both ends of the roll separately depending on the differences between the actual and target values of the compressive forces between the fixed roll and the loose rolls.
Other preferred forms are apparent from the subclaims.
The invention is illustrated by means of exemplary embodiments shown schematically in the following drawings.
Fig. 1a schematically shows a calendar, Fig. 1b shows a side view of the calendar of Fig. 1a, Figs. 2a to 2e show different vertical calendars and a horizontal calender, and Figs. 3a and 3b show a two-roll structure in longitudinal and cross-section.
The calendar consists of a plurality of adjacent rolls between which compression points are formed through which the paper web to be polished passes. Figures 1a and Ib. The corresponding vertical calender 25 has a lower roll 12 and an upper roll 14 and intermediate rollers 16, 17 and 18 interposed therebetween. Part 1a of the intermediate rollers is not shown in Fig. 1a. Although either the upper or lower roll or even one of the intermediate rollers may be a so-called fixed roll, in Fig. 1a the fixed roll 30 is a lower roll 12, which is a so-called NIPCO roll with a cover 13 and a support 15. The NIPCO rolls can be of various types. The cover 13 of this so-called NIPCO-K roll is supported on the sides, and its deflection is compensated by selected ones which can be pressurized with hydraulic oil. With NIPCO-35 F rollers, the cover is not supported on the sides, but the support is provided along the entire length only with a support. Such a NIPCO roll is a known deflection compensated roll.
On the roll cover 13 or support 15 there is a position detector 20 which communicates with the position controller 5 22. The deflection compensating supports described by the arrows 24 are filled with hydraulic oil to provide a variable line pressure to the compression point 26 between the intermediate roller 18 and the lower roller 12. The hydraulic oil pressure is with the oil pressure regulator 10 28. The oil pressure at the various points of the pressing point can be transferred graphically to the monitor via the lines 30.
The position detectors 20 indicate the actual position of the NIPCO roll cover 13 to the regulator 22, which continuously corrects the oil pressure in the areas so that the cover 15 and at the same time the entire roll stack goes to and remains in a certain horizontal position. The whole roll stack swings, so to speak, within rather narrow limits. The rollers rest on the shaft pins 32 with vertical guides. The rolls of a vertical calender are usually against each other due to the weight of the rolls themselves. However, the upper roller 14 may provide additional pressure in the direction of the arrows 34. The upper roll 14 may also be a NIPCO roll.
For example, when the intermediate roll 17 of the vertical calender is locked from the right side, this manifests itself as the roll cover 13 (NIPCO cover) flexing upwards so that the parts belonging to the position detector 20 on the right side in Fig. 25a are spaced apart. The position indicator thus registers the reduced load on the locking side as a slight upward movement of the casing and therefore also directs correspondingly lower oil pressures on this side. 30 Line pressures now generated by the self-loading NIPCO roller. steadily increasing lukittumispuolelta opposing imple tea pressure, which is transmitted through the conductors 30 on the display sloping line pressure curve. The variable vii-free profile is illustrated in Figure 1a by the different dimensional arrows of the NIPCO roll. The lower roll 12, which is implemented as a fixed roll, is then moved according to the invention from the right side, i.e. from the locking side upwards, so that a constant free pressure according to the target values is created over the entire width of the roll. This means that the roll, which is actually a fixed roll, can be moved towards the other 5 rolls at least at its ends for post-adjustment.
It should also be mentioned that when the right side of the intermediate roller 17 is stuck, the conditions above it still remain the same, as shown by the arrows in Fig. 1a. Below the jamming point, the conditions are again adjusted to the target values along the entire length of the rollers by means of a readjustment.
Figures 2a to 2d show vertical calenders and Figure 2e a horizontal calender. In Fig. 2a, the rollers 14 and 16 are loose rollers which have been introduced into the vertical guides 19 by means of guide parts 27. The lower roller 12 is now a fixed roll.
In Fig. 2b, both the upper roll 14 and the lower roll 12 are fixed rollers, but the lower roll 12 can be moved by a lifting device 21 to provide active pressure-force pressure. The jamming can also affect this movement.
In Fig. 2c, the lower roll 12 is a fixed roll, and the upper roll 14 can be moved vertically by a lifting device 21 to provide compressive force pressure.
As in Figure 2b, the calendar of Figure 2d has a lower roller 12 movable by a lifting device 21 and a fixed intermediate roller 14 "25".
The horizontal calender of Fig. 2e has a far right roll 14 'fixed roll, and a far left roll 12' a roll movable by a lifting device 21 '. The intermediate rollers 16 'can also be moved as loose rollers 30 by a guide 19' by means of guide parts 27 '.
. To simplify the system, the measurement can be performed separately at both ends of the fixed roll. In this case, it does not matter whether the load is due to the vertical calender's own weight and additional load or to the pressure 35 produced from below. However, it must always be ensured that the one-sided actual unloaded load of 7 95938 caused by the jam is corrected by moving the fixed roller slightly from the corresponding end and thus reaching the target value again. Loads can be measured, for example, from the hydraulic or pneumatic pressures of compression systems.
5 It is also possible to measure the actual value at the solid roll support with the measuring boxes and then adjust the reading to the target value. Lifting devices, piston systems or other mechanical devices can be used to change the position of the fixed roll.
10 Measuring and positioning systems can also be used in combination, for example as a so-called "Floating-Stack" principle, in combination with position detectors and self-loading NIPCO rollers.
The correction of the position of the fixed roll in the direction of or away from the friction-causing roll 15 can be automated at both ends of the roll separately depending on the differences between the actual and target values of the compressive forces. It is not necessary for the system to know which roller guides are causing friction or jamming.
Figures 3a and 3b show a two-roll system. There are two so-called NIPCO-F rollers. The roll cover 13 rests on the support 15 by hoists 42 which can be selectively pressurized through the chamber 43 and the oil line 44 as shown by the arrows in Figure 3a. Casing 13 of the outer edge 25 is supported by a bearing 38. The slotted crank kulissiin 40 moves in the vertical positions of the slide 15 do control the direction of arrow as shown in Figure 3b. It is thus able to move along the respective vertical guide surfaces 50 relative to the support 15, depending on the pressure of the hoist and the compressive force generated. Increased friction on these surfaces can cause entrapment. The movement of the roll cover 13 relative to the support 15 can be measured by a displacement sensor 46. In this case, it is possible to compensate for the disproportion of the compressive forces caused by the occurrences of the jams 35 by means of simple software control alone.
Priority Applications (2)
|Application Number||Priority Date||Filing Date||Title|
|DE19893936128 DE3936128C2 (en)||1989-10-30||1989-10-30|
|Publication Number||Publication Date|
|FI904759A0 FI904759A0 (en)||1990-09-27|
|FI95938B true FI95938B (en)||1995-12-29|
|FI95938C FI95938C (en)||1996-04-10|
Family Applications (1)
|Application Number||Title||Priority Date||Filing Date|
|FI904759A FI95938C (en)||1989-10-30||1990-09-27||Calendars for surface treatment of material webs|
Country Status (5)
|AT (1)||AT399175B (en)|
|CA (1)||CA2027460C (en)|
|DE (1)||DE3936128C2 (en)|
|FI (1)||FI95938C (en)|
|GB (1)||GB2237584B (en)|
Families Citing this family (6)
|Publication number||Priority date||Publication date||Assignee||Title|
|DE9314568U1 (en) *||1993-09-27||1995-02-02||Kuesters Eduard Maschf||Roller|
|FI96334C (en) *||1993-11-24||1996-06-10||Valmet Paper Machinery Inc||Method for calendering paper or similar web material and calender applying the method|
|DE19520479C2 (en) *||1994-06-23||1996-07-11||Kuesters Eduard Maschf||Calibration calender for plastic films|
|DE19511145C2 (en) *||1995-03-27||2000-07-13||Voith Sulzer Finishing Gmbh||Calender for double-sided paper treatment|
|DE29720192U1 (en)||1997-11-14||1999-03-25||Kuesters Eduard Maschf||Calender for treating a web|
|DE102009050201A1 (en)||2009-10-21||2011-04-28||Fleissner Gmbh||Calendar device for treatment of e.g. plastic film, has supporting bodies provided below roller for changing linear pressure of roll gap between rollers, where bodies are impinged on outer circumference of rollers|
Family Cites Families (21)
|Publication number||Priority date||Publication date||Assignee||Title|
|US3119324A (en) *||1960-08-29||1964-01-28||Beloit Iron Works||Controlled deflection roll|
|CH589806A5 (en) *||1975-03-04||1977-07-15||Escher Wyss Ag|
|DE2738781A1 (en) *||1977-08-27||1979-03-08||Ema Elektronik Maschinen Appar||Paper-making roller press section - has a pressure measurement taken at the roller stub axle|
|CH626273A5 (en) *||1978-04-18||1981-11-13||Escher Wyss Ag|
|JPS638239B2 (en) *||1978-10-16||1988-02-22||Kleinewefers Gmbh|
|AT369063B (en) *||1979-05-10||1982-12-10||Escher Wyss Ag||Rolling device for rolling sheet-shaped materials|
|DE3004914C2 (en) *||1980-02-09||1982-07-15||Kleinewefers Gmbh, 4150 Krefeld, De|
|DE3004913C2 (en) *||1980-02-09||1982-07-15||Kleinewefers Gmbh, 4150 Krefeld, De|
|DE3101429C2 (en) *||1981-01-14||1987-10-29||Sulzer-Escher Wyss Ag, Zuerich, Ch|
|DE3117398C2 (en) *||1981-05-02||1987-08-06||Sulzer-Escher Wyss Ag, Zuerich, Ch|
|DE3117516C2 (en) *||1981-05-02||1984-07-26||Escher Wyss Ag, Zuerich, Ch|
|CH656812A5 (en) *||1982-04-08||1986-07-31||Escher Wyss Ag||Rolling device.|
|DE3325385C2 (en) *||1983-07-14||1988-11-03||Kleinewefers Gmbh, 4150 Krefeld, De|
|DE3338625C2 (en) *||1983-10-17||1986-11-20||Sulzer-Escher Wyss Ag, Zuerich, Ch|
|FI79875C (en) *||1983-10-17||1990-03-12||Escher Wyss Ag||Calendar|
|DE3416210C3 (en) *||1984-05-02||1994-07-14||Kleinewefers Gmbh||Roller press for paper and similar webs|
|DE3533210C2 (en) *||1985-09-18||1990-02-08||Kuesters, Eduard, 4150 Krefeld, De|
|DE3640161C2 (en) *||1985-12-23||1989-01-26||Sulzer-Escher Wyss Gmbh, 7980 Ravensburg, De|
|EP0229210A1 (en) *||1986-01-16||1987-07-22||MOOG GmbH||Regulator for a roller having hydrostatic supporting elements|
|DE3622398C1 (en) *||1986-02-18||1987-06-19||Escher Wyss Ag||Sepg. calender rolls - involves lowering pressure in hydraulic carrier support installations with time delay w.r.t. pressure to prevent damage to roll surface|
|DE3767476D1 (en) *||1987-05-09||1991-02-21||Kleinewefers Gmbh||Method for operating a rolling machine and control arrangement for carrying out this method.|
- 1989-10-30 DE DE19893936128 patent/DE3936128C2/de not_active Expired - Fee Related
- 1990-08-01 AT AT162490A patent/AT399175B/en not_active IP Right Cessation
- 1990-09-27 FI FI904759A patent/FI95938C/en not_active IP Right Cessation
- 1990-10-10 GB GB9022049A patent/GB2237584B/en not_active Expired - Fee Related
- 1990-10-12 CA CA 2027460 patent/CA2027460C/en not_active Expired - Fee Related
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|DE10331064B4 (en)||Device for processing a material web|
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|BB||Publication of examined application|
Owner name: SULZER-ESCHER WYSS GMBH