EP0242515B1 - Process and regulating device for separating calander rolls - Google Patents

Process and regulating device for separating calander rolls Download PDF

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Publication number
EP0242515B1
EP0242515B1 EP87101615A EP87101615A EP0242515B1 EP 0242515 B1 EP0242515 B1 EP 0242515B1 EP 87101615 A EP87101615 A EP 87101615A EP 87101615 A EP87101615 A EP 87101615A EP 0242515 B1 EP0242515 B1 EP 0242515B1
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EP
European Patent Office
Prior art keywords
pressure
carrier
hydraulic
roller shell
supporting
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EP87101615A
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German (de)
French (fr)
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EP0242515A1 (en
Inventor
Rolf Lehmann
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Sulzer Escher Wyss AG
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Sulzer Escher Wyss AG
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Application filed by Sulzer Escher Wyss AG filed Critical Sulzer Escher Wyss AG
Priority to AT87101615T priority Critical patent/ATE48668T1/en
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    • 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

Definitions

  • the invention relates to a method for separating the rolls of a calender with a stand and with a plurality of rolls arranged one above the other, of which the bottom roll has a support which can be moved in the vertical direction by means of hydraulic support devices but is non-rotatably mounted, and a support which can be rotated about this support by at least one has a hydraulic support element supported against the carrier and movable in the vertical direction, wherein both the pressure in the hydraulic carrier support devices and in the hydraulic roller jacket support elements is reduced, so that both the carrier and the roller jacket are moved vertically downward, and a control device for applying this method.
  • This calender corresponds essentially to the construction described in US Pat. No. 3,884,141, the bottom roller being designed as a deflection compensation roll, roughly in the manner described in US Pat. No. 3,885,283, in which the roll casing is vertically in the frame relative to the carrier of the range of motion of the support elements is freely movable, but in addition the carrier at its ends or bearings relative to the stand by means of hydraulic, for example hydrostatic support devices is supported.
  • Closing the calender i.e. the entire roll stack is raised here by pressurizing both the hydraulic roll shell support elements and the hydrostatic support supports.
  • the object of the invention is to eliminate the above-mentioned disadvantages of the prior art and in particular to provide a method and a control device for opening a calender and for separating a roll stack, in which the separation time is shortened, but damage to the roll shell is avoided .
  • the method according to the invention is characterized in that the pressure in the hydraulic carrier support devices is reduced with a certain time delay compared to the pressure in the hydraulic roll jacket support elements.
  • the control device according to the invention has a corresponding device for staggering the pressure reduction over time.
  • the pressure in the hydraulic support elements of the roll shell is first reduced and only then, after a certain delay time, the pressure in the support devices of the carrier.
  • the delay time is advantageously chosen in the range between one hundredth and half a second, preferably in the order of magnitude of one tenth of a second.
  • the lowering of the carrier by means of suitable sensors is only triggered when a point of the carrier is opposite a fixed point, e.g. a support member, the roll shell or the stand has moved a predetermined distance.
  • the invention is based here on the new finding that when the pressure in the roller jacket support elements drops rapidly, for example by quickly opening the valve of the pressure lines, the support, which is preloaded and bent by the hydraulic forces, springs back into the unloaded state when the pressure is suddenly released.
  • This leads to an instantaneous pressure increase in the pressure chambers of the roll shell support elements, so that the roll shell does not fall down immediately after the valve opening due to its gravity and opens the calender.
  • the size of this pressure increase in the individual pressure rooms depends on the locally different springback of the carrier. Since the springback of the carrier takes place very quickly, the pressure currently building up in the pressure chamber of the support elements cannot be released quickly enough via the valve in the pressure lines, and part of the pressure medium is released from the Support elements pushed out. The release of the currently increased pressure requires a certain amount of time.
  • this is avoided in that the valve for lowering the carrier is opened with a sufficient delay time in which the pressure in the roller jacket support elements has decreased to a non-hazardous level.
  • the risk of damage to the roller jacket is avoided, and the pressure can be reduced suddenly, i.e. the valves of the pressure lines can be opened fully immediately.
  • the separation time of the roll stack is therefore reduced to a minimum, without the risk of damage.
  • the calender shown in Figures 1 and 2 contains a stand 1 which e.g. can be designed like a frame and contains two vertical side parts 1 '. Each side part is provided with a guide 2, on which bearing blocks 3, 4 5 and 6 of rollers 7, 8, 9 and 10 are attached.
  • the bearing blocks 3 - 6 are adjustable along the guide roller.
  • the bearing blocks themselves are provided with guides 11, in which bearing blocks 12 of the individual rollers are guided.
  • the bearing blocks 12 contain bearing bushes 13, in which pins 14 of the individual rollers are rotatably mounted.
  • the movement of the bearing blocks 12 downwards is limited by stop screws 15.
  • the stop screws 15 are set so that the required gaps S between the individual rolls result when the calender is open.
  • the lowermost roller 16 is designed as a deflection compensation roller and contains a fixed support 17, the pin 28 of which is supported by hydraulic support devices 18 and can be raised up to stops.
  • a roller jacket 20, which is supported on hydrostatic support elements 21 and is supported against the carrier, can be rotated around the carrier 17.
  • the hydrostatic support elements 21 are piston-like parts which are guided in cylinder bores 22 of the carrier 17 and together with these form pressure spaces.
  • a hydraulic pressure medium from a pump 24 with a certain pressure is fed into these pressure spaces through a line 23.
  • a switching element is arranged in line 23, which can be designed, for example, as a three-way valve 26.
  • This three-way valve 26 allows the pump 24 to be switched off from the pressure chambers 22 and a momentary pressure relief due to the discharge of the pressure medium via the line 25.
  • the force of the force exerted by the hydraulic support elements 21 on the roller shell 20 also decreases, and the support elements 21 and Roller jacket 20 sink to its lowest position, which opens the calender.
  • the roller jacket 20, as shown in FIG. 2 is supported on a series of support elements 21.
  • the support elements can be designed, for example, as described in US 3 802 044, i.e. as support elements with hydrostatic pressure pockets on their bearing surface.
  • a single strip-shaped support element can also be used, which runs along a substantial part of the axial length of the jacket 20.
  • the support elements can also be designed as hydraulically pressed support elements with a hydrodynamic bearing surface, or as hydraulic pressure pads on the top of the carrier.
  • the hydraulic support devices 18 of the carrier 17 can, as shown in the example, be designed as hydrostatic bearing support devices with a piston 29 which is movable in the vertical direction in a pressure chamber or cylinder 27 and is connected to the bearing journal 28 of the carrier 17.
  • the pressure chambers 27 are also supplied via lines 30 by a pump 31 with a hydraulic pressure medium with a certain pressure. Also arranged in the line is a switching element 32, for example a three-way valve, with which the pump 31 can be switched off and the pressure spaces 27 can be relieved of pressure by draining off the pressure medium via lines 33.
  • the switching devices 26 and 32 can be controlled by means of a control device 34 and can be switched from the pressure medium supply position to the pressure relief position.
  • the switching device 26 for the pressure drop in the pressure chambers 22 of the roll shell support elements 21 is switched over immediately after the triggering of the control device 34, which can be done manually or by a suitable detector which signals a defect in the rolled web.
  • the actuation of the switching element 32 for the pressure chamber 27 of the carrier support device 18 takes place via a time delay element 35, which causes the switching device 32 for the carrier support device to switch only after a certain delay after the switching device 26 has been switched over or the roller jacket has been relieved of pressure - Support elements are made.
  • the delay time of the delay circuit 35 is chosen such that after a pressure peak in the pressure chambers 22 of the individual roll shell support elements, due to the springback of the carrier, the pressure also in the most heavily loaded pressure chambers, preferably in the middle of the carrier, such as which has decreased to a safe level.
  • the delay time should be at least one hundredth of a second.
  • the delay time should not be too long, that is to say generally not more than half a second, in order not to lose the advantageous effect of the pressure reduction in both the pressure spaces of the roll shell support elements and in the support devices. It was found that the risk of damage to the roller jacket is considerably reduced if the delay time is of the order of about a tenth of a second.
  • a suitable pressure sensor 36 is provided in a particularly heavily loaded pressure chamber 22, which is provided, for example, approximately in the middle of the carrier 17, which additionally controls the delay device 35 and causes the switching device 32 only then is triggered when, after a pressure peak in the pressure chamber 22, the pressure has dropped to a predetermined threshold value. In this way, an even better security against damage to the roll shell is achieved.
  • a sensor can be used with an analogous advantage, which measures the movement of the carrier 17 during the springback, wherein the associated support element 21, the roller jacket 20 or the stand 1 can serve as a fixed point.
  • the delay device 35 is only released by the sensor when the carrier 17 has rebounded at the measuring point by a predetermined amount.
  • This amount of springback is expediently chosen such that the pressure peak in the pressure chamber 22 has decayed to such an extent that there is no longer any risk of damage to the roller shell when the carrier 17 is lowered.

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  • Paper (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Rolls And Other Rotary Bodies (AREA)

Abstract

The bottom roll of a roll stack in a calender is constructed as a controlled deflection roll equipped with a non-rotatable carrier or support beam and a roll shell rotatable about the non-rotatable carrier. The roll shell is supported on the non-rotatable carrier by means of hydraulic support or pressure elements. The non-rotatable carrier is supported with respect to the calender stand by means of hydraulic carrier support devices. For the rapid opening of the calender and to avoid damage to the roll shell, initially the pressure exerted on the roll shell support elements is reduced in a sudden manner and only after a predetermined time-delay is there reduced the pressure exerted on the carrier support devices. The time-delay is chosen such that the pressure peak occurring in the roll shell support elements due to the springing back or recovery of the non-rotatable carrier has dropped to a safe value and the risk of damage to the roll shell, such as would occur in the case of a simultaneous pressure drop, is avoided.

Description

Die Erfindung betrifft ein Verfahren zur Trennung der Walzen eines Kalanders mit einem Ständer und mit mehreren übereinander angeordneten Walzen, von denen die unterste Walze einen mittels hydraulischer Stützeinrichtungen in vertikaler Richtung beweglich, jedoch drehfest gelagerten Träger, sowie einen um diesen Träger rotierbaren, durch wenigstens ein hydraulisches Stützelement gegen den Träger abgestützten und in vertikaler Richtung beweglichen Walzenmantel aufweist, wobei sowohl der Druck in den hydraulischen Träger-Stützeinrichtungen als auch in den hydraulischen Walzenmantel-Stützelementen abgesenkt wird, so dass sowohl der Träger als auch der Walzenmantel vertikal nach unten bewegt wird, sowie eine Steuereinrichtung zur Anwendung dieses Verfahrens.The invention relates to a method for separating the rolls of a calender with a stand and with a plurality of rolls arranged one above the other, of which the bottom roll has a support which can be moved in the vertical direction by means of hydraulic support devices but is non-rotatably mounted, and a support which can be rotated about this support by at least one has a hydraulic support element supported against the carrier and movable in the vertical direction, wherein both the pressure in the hydraulic carrier support devices and in the hydraulic roller jacket support elements is reduced, so that both the carrier and the roller jacket are moved vertically downward, and a control device for applying this method.

Ein solches Verfahren ist der Fachwelt durch die Inbetriebnahme eines derartigen Kalanders im Werk Augsburg der Haindl Papier GmbH am 17.01.1980 bekannt geworden.Such a process has become known to the professional world through the commissioning of such a calender in the Augsburg plant of Haindl Papier GmbH on January 17th, 1980.

Dieser Kalander entspricht im wesentlichen der in US-A 3 884 141 beschriebenen Konstruktion, wobei die unterste Walze als Durchbiegungsausgleichswalze, etwa in der in US-A 3 885 283 beschriebenen Art ausgebildet ist, bei welcher der Walzenmantel gegenüber dem Träger in vertikaler Richtung im Rahmen des Bewegungsspielraumes der Stützelemente frei beweglich ist, wobei jedoch zusätzlich der Träger an seinen Enden bzw. Lagern gegenüber dem Ständer mittels hydraulischer, z.B. hydrostatischer Stützeinrichtungen abgestützt ist. Ein Schliessen des Kalanders, d.h. eine Anhebung des gesamten Walzenstapels erfolgt hierbei durch Druckbeaufschlagung sowohl der hydraulischen Walzenmantel-Stützelemente als auch der hydrostatischen Träger-Stützeinrichtungen.This calender corresponds essentially to the construction described in US Pat. No. 3,884,141, the bottom roller being designed as a deflection compensation roll, roughly in the manner described in US Pat. No. 3,885,283, in which the roll casing is vertically in the frame relative to the carrier of the range of motion of the support elements is freely movable, but in addition the carrier at its ends or bearings relative to the stand by means of hydraulic, for example hydrostatic support devices is supported. Closing the calender, i.e. the entire roll stack is raised here by pressurizing both the hydraulic roll shell support elements and the hydrostatic support supports.

Ebenso ist ein schnelles Oeffnen des Kalanders, d.h. eine schnelle Absenkung des gesamten Walzenstapels, bis die einzelnen Walzen auf zugeordneten Anschlägen aufliegen, möglich, indem sowohl der Druck in den hydraulischen Walzenmantel-Stützelementen als auch in den hydrostatischen Träger-Stützeinrichtungen durch Oeffnung entsprechender Ventile abgesenkt wird. Durch die Bewegung sowohl des Trägers gegenüber dem Ständer als auch des Walzenmantels gegenüber dem Träger können, insbesondere bei Kalandern für die Bearbeitung von Papier, Kunststoff oder andere Materialien beim Auftreten einer Störung, z.B. eines Bahnrisses, die Walzen des Kalanders mit besonders kurzer Trennzeit voneinander getrennt und somit die Gefahr einer Beschädigung so gering wie möglich gehalten wird.There is also a quick opening of the calender, i.e. a rapid lowering of the entire roll stack until the individual rolls rest on assigned stops, by lowering both the pressure in the hydraulic roll shell support elements and in the hydrostatic support devices by opening corresponding valves. Due to the movement of both the carrier relative to the stand and the roll shell relative to the carrier, especially in the case of calenders for the processing of paper, plastic or other materials, if a malfunction occurs, e.g. a web break, the rollers of the calender are separated from each other with a particularly short separation time and the risk of damage is kept as low as possible.

Bei dem in DE-A 3 004 912 beschriebenen Kalander ähnlicher Ausführung wird vorgeschlagen, die Ventile der Druckleitungen für die Lager-Stützeinrichtungen und die Walzenmantel-Stützelemente gleichzeitig zu öffnen. Bei der Anwendung dieses Verfahrens mit gleichzeitig beginnender Absenkung des Trägers und des Walzenmantels ergaben sich jedoch Schwierigkeiten, insbesondere bei Kalandern mit hohem Pressdruck und bei dem Versuch, besonders kurze Trennzeiten zu erreichen. Einserseits liess sich die Trennzeit des Walzenstapels nicht ohne weiteres auf die gewünschten kurzen Zeiten reduzieren, andererseits ergaben sich speziell bei sehr hohem Pressdruck Beschädigungen, wie Risse oder Brüche des Walzenmantels der Durchbiegungsausgleichswalze, deren Ursache offenbar nicht erkannt wurde.In the calender of a similar design described in DE-A 3 004 912, it is proposed to open the valves of the pressure lines for the bearing support devices and the roller jacket support elements at the same time. Difficulties arose when using this method, with the carrier and the roll mantle starting to lower at the same time, in particular with calenders with a high pressing pressure and when trying to achieve particularly short separation times. On the one hand, the separation time of the roll stack could not be reduced to the desired short times, on the other hand, especially at very high pressing pressure, there were damage, such as cracks or breaks in the roll shell of the deflection compensating roll, the cause of which was obviously not recognized.

Die Erfindung setzt sich die Aufgabe, die vorstehend genannten Nachteile des Standes der Technik zu beseitigen und insbesondere ein Verfahren und eine Steuereinrichtung zum Oeffnen eines Kalanders und zum Trennen eines Walzenstapels zu schaffen, bei welchem die Trennzeit verkürzt ist, jedoch eine Beschädigung des Walzenmantels vermieden wird.The object of the invention is to eliminate the above-mentioned disadvantages of the prior art and in particular to provide a method and a control device for opening a calender and for separating a roll stack, in which the separation time is shortened, but damage to the roll shell is avoided .

Das erfindungsgemässe Verfahren ist dadurch gekennzeichnet, dass der Druck in den hydraulischen Träger-Stützeinrichtungen gegenüber dem Druck in den hydraulischen Walzenmantel-Stützelementen mit einer bestimmten Zeitverzögerung abgesenkt wird. Die erfindungsgemässe Steuereinrichtung weist eine entsprechende Einrichtung zur zeitlichen Staffelung der Druckabsenkung auf.The method according to the invention is characterized in that the pressure in the hydraulic carrier support devices is reduced with a certain time delay compared to the pressure in the hydraulic roll jacket support elements. The control device according to the invention has a corresponding device for staggering the pressure reduction over time.

Auf die genannte Weise wird zuerst der Druck in den hydraulischen Stützelementen des Walzenmantels abgesenkt und erst anschliessend nach einer bestimmten Verzögerungszeit der Druck in den Stützeinrichtungen des Trägers. Die Verzögerungszeit wird dabei vorteilhafterweise im Bereich zwischen einem Hundertstel und einer halben Sekunde gewählt, vorzugsweise im Grössenordnungsbereich von einer Zehntel Sekunde.In the manner mentioned, the pressure in the hydraulic support elements of the roll shell is first reduced and only then, after a certain delay time, the pressure in the support devices of the carrier. The delay time is advantageously chosen in the range between one hundredth and half a second, preferably in the order of magnitude of one tenth of a second.

Bei einer besonders vorteilhaften Weiterbildung der Erfindung wird die Absenkung des Trägers mittels geeigneter Sensoren erst dann ausgelöst, wenn sich ein Punkt des Trägers gegenüber einem Fixpunkt, z.B. einem Stützelement, dem Walzenmantel oder dem Ständer um eine vorbestimmte Strecke bewegt hat.In a particularly advantageous development of the invention, the lowering of the carrier by means of suitable sensors is only triggered when a point of the carrier is opposite a fixed point, e.g. a support member, the roll shell or the stand has moved a predetermined distance.

Besonders vorteilhaft ist es, den Druckverlauf in einem der Druckräume zu messen, z.B. mit einem geeigneten Drucksensor, und die Trägerabsenkung erst dann auszulösen, wenn der Druck im Druckraum auf einen bestimmten, ungefährlichen Wert zurückgegangen ist.It is particularly advantageous to measure the pressure curve in one of the pressure spaces, e.g. with a suitable pressure sensor, and to trigger the lowering of the carrier only when the pressure in the pressure chamber has decreased to a certain, harmless value.

Die Erfindung gründet sich hierbei auf der neuen Erkenntnis, dass bei einer schnellen Druckabsenkung in den Walzenmantel-Stützelementen, beispielsweise durch schnelles Oeffnen des Ventils der Druckleitungen, der durch die hydraulischen Kräfte vorgespannte und durchgebogene Träger bei plötzlicher Druckentlastung in den unbelasteten Zustand zurückfedert. Dies führt zu einer momentanen Druckerhöhung in den Druckräumen der Walzenmantel-Stützelemente, so dass der Walzenmantel nicht unmittelbar nach der Ventilöffnung zufolge seiner Schwerkraft nach unten fällt und den Kalander öffnet. Die Grösse dieser Druckerhöhung in den einzelnen Druckräumen hängt dabei von der örtlich verschiedenen Rückfederung des Trägers ab. Da die Rückfederung des Trägers sehr schnell erfolgt, kann sich der momentan im Druckraum der Stützelemente aufbauende Druck nämlich nicht schnell genug über das Ventil in den Druckleitungen abbauen, und ein Teil des Druckmittels wird aus den Stützelementen herausgedrückt. Der Abbau des momentan erhöhten Druckes erfordert dabei eine gewisse Zeitdauer.The invention is based here on the new finding that when the pressure in the roller jacket support elements drops rapidly, for example by quickly opening the valve of the pressure lines, the support, which is preloaded and bent by the hydraulic forces, springs back into the unloaded state when the pressure is suddenly released. This leads to an instantaneous pressure increase in the pressure chambers of the roll shell support elements, so that the roll shell does not fall down immediately after the valve opening due to its gravity and opens the calender. The size of this pressure increase in the individual pressure rooms depends on the locally different springback of the carrier. Since the springback of the carrier takes place very quickly, the pressure currently building up in the pressure chamber of the support elements cannot be released quickly enough via the valve in the pressure lines, and part of the pressure medium is released from the Support elements pushed out. The release of the currently increased pressure requires a certain amount of time.

Wenn nun der Träger der Durchbiegungsausgleichswalze gleichzeitig abgesenkt wird, bevor der Druck in den Stützelementen des Walzenmantels auf ein ungefährliches Mass abgesenkt wurde, kann es geschehen, dass zufolge der beschriebenen, örtlich verschiedenen Rückfederung des Trägers ein Spalt zwischen dem Walzenmantel der Durchbiegungsausgleichswalze und der darüber angeordneten Kalanderwalze entsteht, wobei momentan eine so grosse Kraft auf den Walzenmantel ausgeübt werden kann, dass dieser beschädigt werden kann.If the support of the deflection compensation roll is simultaneously lowered before the pressure in the support elements of the roll cover has been reduced to a safe level, it can happen that, due to the locally different springback of the support described, a gap between the roll cover of the deflection compensation roll and the one arranged above it Calender roll is created, at the moment such a large force can be exerted on the roll shell that it can be damaged.

Erfindungsgemäss wird dies dadurch vermieden, dass das Ventil für die Absenkung des Trägers mit einer ausreichenden Verzögerungszeit geöffnet wird, in welcher der Druck in den Walzenmantel-Stützelementen auf ein ungefährliches Mass zurückgegangen ist. Dabei wird die Gefahr einer Beschädigung des Walzenmantels vermieden, wobei die Druckabsenkung schlagartig vorgenommen werden kann, d.h. die Ventile der Druckleitungen sofort voll geöffnet werden können. Die Trennzeit des Walzenstapels wird daher auf ein Mindestmass herabgesetzt, ohne die Gefahr von Beschädigungen.According to the invention, this is avoided in that the valve for lowering the carrier is opened with a sufficient delay time in which the pressure in the roller jacket support elements has decreased to a non-hazardous level. The risk of damage to the roller jacket is avoided, and the pressure can be reduced suddenly, i.e. the valves of the pressure lines can be opened fully immediately. The separation time of the roll stack is therefore reduced to a minimum, without the risk of damage.

Die Erfindung wird anhand eines in den Figuren dargestellten Ausführungsbeispieles näher erläutert. Es zeigen:

  • Figur 1 einen Kalander in Seitenansicht, und
  • Figur 2 einen Kalander in Frontalansicht.
The invention is explained in more detail using an exemplary embodiment shown in the figures. Show it:
  • Figure 1 shows a calender in side view, and
  • Figure 2 shows a calender in a frontal view.

Der in den Figuren 1 und 2 dargestellte Kalander enthält einen Ständer 1, der z.B. rahmenartig ausgebildet sein kann und zwei vertikale Seitenteile 1' enthält. Jeder Seitenteil ist mit einer Führung 2 versehen, an welcher Lagerböcke 3, 4 5 und 6 von Walzen 7, 8, 9 und 10 befestigt sind. Die La gerböcke 3 - 6 sind entlang der Führungswalze verstellbar. Die Lagerböcke selbst sind mit Führungen 11 versehen, in welchen Lagerblöcke 12 der einzelnen Walzen geführt sind. Die Lagerblöcke 12 enthalten Lagerbüchsen 13, in welchen Zapfen 14 der einzelnen Walzen drehbar gelagert sind. Die Bewegung der Lagerblöcke 12 nach unten ist durch Anschlagschrauben 15 begrenzt. Die Anschlagschrauben 15 werden so eingestellt, dass sich bei offenem Kalander die erforderlichen Spalte S zwischen den einzelnen Walzen ergeben.The calender shown in Figures 1 and 2 contains a stand 1 which e.g. can be designed like a frame and contains two vertical side parts 1 '. Each side part is provided with a guide 2, on which bearing blocks 3, 4 5 and 6 of rollers 7, 8, 9 and 10 are attached. The bearing blocks 3 - 6 are adjustable along the guide roller. The bearing blocks themselves are provided with guides 11, in which bearing blocks 12 of the individual rollers are guided. The bearing blocks 12 contain bearing bushes 13, in which pins 14 of the individual rollers are rotatably mounted. The movement of the bearing blocks 12 downwards is limited by stop screws 15. The stop screws 15 are set so that the required gaps S between the individual rolls result when the calender is open.

Die unterste Walze 16 ist als Durchbiegungsausgleichswalze ausgeführt und enthält einen feststehenden Träger 17, dessen Zapfen 28 mit hydraulischen Stützeinrichtungen 18 abgestützt und bis zu Anschlägen anhebbar sind. Um den Träger 17 ist ein Walzenmantel 20 drehbar, welcher auf hydrostatischen Stützelementen 21 gelagert und gegen den Träger abgestützt ist. Die hydrostatischen Stützelemente 21 sind kolbenartige Teile, welche in Zylinderbohrungen 22 des Trägers 17 geführt sind und mit diesen zusammen Druckräume bilden. In diese Druckräume wird durch eine Leitung 23 ein hydraulisches Druckmittel aus einer Pumpe 24 mit einem bestimmten Druck zugeführt.The lowermost roller 16 is designed as a deflection compensation roller and contains a fixed support 17, the pin 28 of which is supported by hydraulic support devices 18 and can be raised up to stops. A roller jacket 20, which is supported on hydrostatic support elements 21 and is supported against the carrier, can be rotated around the carrier 17. The hydrostatic support elements 21 are piston-like parts which are guided in cylinder bores 22 of the carrier 17 and together with these form pressure spaces. A hydraulic pressure medium from a pump 24 with a certain pressure is fed into these pressure spaces through a line 23.

In der Leitung 23 ist ein Schaltorgan angeordnet, welches beispielsweise als Dreiwegventil 26 ausgebildet sein kann. Dieses Dreiwegventil 26 gestattet ein Abschalten der Pumpe 24 von den Druckräumen 22 und eine momentane Druckentlastung durch Abfluss des Druckmittels über die Leitung 25. Damit sinkt auch die Kraft der von den hydraulischen Stützelementen 21 auf den Walzenmantel 20 ausgeübten Kraft, und die Stützelemente 21 und der Walzenmantel 20 sinken in ihre tiefste Stellung, wodurch der Kalander geöffnet wird.A switching element is arranged in line 23, which can be designed, for example, as a three-way valve 26. This three-way valve 26 allows the pump 24 to be switched off from the pressure chambers 22 and a momentary pressure relief due to the discharge of the pressure medium via the line 25. The force of the force exerted by the hydraulic support elements 21 on the roller shell 20 also decreases, and the support elements 21 and Roller jacket 20 sink to its lowest position, which opens the calender.

In der Regel ist der Walzenmantel 20, wie in Figur 2 gezeigt, auf einer Reihe von Stützelementen 21 abgestützt. Die Stützelemente können dabei beispielsweise, wie in US 3 802 044 beschrieben, ausgeführt sein, d.h. als Stützelemente mit hydrostatischen Drucktaschen an ihrer Lagerfläche. Es kann jedoch auch ein einziges leistenförmiges Stützelement verwendet werden, das entlang eines wesentlichen Teiles der axialen Länge des Mantels 20 verläuft. Die Stützelemente können jedoch auch als hydraulisch angepresste Stützelemente mit hydrodynamischer Lagerfläche ausgeführt sein, oder als hydraulische Druckpolster an der Oberseite des Trägers.As a rule, the roller jacket 20, as shown in FIG. 2, is supported on a series of support elements 21. The support elements can be designed, for example, as described in US 3 802 044, i.e. as support elements with hydrostatic pressure pockets on their bearing surface. However, a single strip-shaped support element can also be used, which runs along a substantial part of the axial length of the jacket 20. However, the support elements can also be designed as hydraulically pressed support elements with a hydrodynamic bearing surface, or as hydraulic pressure pads on the top of the carrier.

Die hydraulischen Stützeinrichtungen 18 des Trägers 17 können, wie im Beispiel dargestellt, als hydrostatische Lager-Stützeinrichtungen mit einem in einem Druckraum oder Zylinder 27 in vertikaler Richtung beweglichen, mit den Lagerzapfen 28 des Trägers 17 verbundenen Kolben 29 ausgeführt sein. Die Druckräume 27 werden ebenfalls über Leitungen 30 durch eine Pumpe 31 mit einem hydraulischen Druckmittel mit bestimmtem Druck versorgt. In der Leitung ist ebenfalls ein Schaltorgan 32, beispielsweise ein Dreiwegventil angeordnet, mit welchem ein Abschalten der Pumpe 31 und eine Druckentlastung der Druckräume 27 durch Abfluss des Druckmittels über Leitungen 33 erfolgen kann.The hydraulic support devices 18 of the carrier 17 can, as shown in the example, be designed as hydrostatic bearing support devices with a piston 29 which is movable in the vertical direction in a pressure chamber or cylinder 27 and is connected to the bearing journal 28 of the carrier 17. The pressure chambers 27 are also supplied via lines 30 by a pump 31 with a hydraulic pressure medium with a certain pressure. Also arranged in the line is a switching element 32, for example a three-way valve, with which the pump 31 can be switched off and the pressure spaces 27 can be relieved of pressure by draining off the pressure medium via lines 33.

Die Schalteinrichtungen 26 und 32 sind mittels einer Steuereinrichtung 34 ansteuerbar und von der Druckmittelzufuhrstellung in die Druckentlastungsstellung umschaltbar. Dabei erfolgt die Umschaltung der Schalteinrichtung 26 für den Druckabfall in den Druckräumen 22 der Walzenmantel-Stützelemente 21 unmittelbar nach der Auslösung der Steuereinrichtung 34, welche manuell oder durch einen geeigneten, einen Defekt der gewalzten Bahn signalisierenden Detektor erfolgen kann. Die Ansteuerung des Schaltelementes 32 für den Druckraum 27 der Träger-Stützeinrichtung 18 erfolgt über ein Zeitverzögerungsglied 35, welches bewirkt, dass die Umschaltung der Schalteinrichtung 32 für die Träger-Stützeinrichtung erst nach einer bestimmten Verzögerungszeit nach der Umschaltung der Schalteinrichtung 26 oder der Druckentlastung der Walzenmantel-Stützelemente erfolgt.The switching devices 26 and 32 can be controlled by means of a control device 34 and can be switched from the pressure medium supply position to the pressure relief position. The switching device 26 for the pressure drop in the pressure chambers 22 of the roll shell support elements 21 is switched over immediately after the triggering of the control device 34, which can be done manually or by a suitable detector which signals a defect in the rolled web. The actuation of the switching element 32 for the pressure chamber 27 of the carrier support device 18 takes place via a time delay element 35, which causes the switching device 32 for the carrier support device to switch only after a certain delay after the switching device 26 has been switched over or the roller jacket has been relieved of pressure - Support elements are made.

Die Verzögerungszeit der Verzögerungsschaltung 35 ist so gewählt, dass nach einer Druckspitze in den Druckräumen 22 der einzelnen Walzenmantel-Stützelemente infolge der Träger-Rückfederung der Druck auch in den stärkst belasteten Druckräumen, vorzugsweise in der Mitte des Trägers, wieder auf ein ungefährliches Mass zurückgegangen ist. Erfahrungsgemäss zeigte es sich, dass die Verzögerungszeit mindestens eine Hundertstel Sekunde betragen sollte. Andererseits sollte die Verzögerungszeit nicht zu lang sein, d.h. in der Regel nicht grösser als eine halbe Sekunde, um die vorteilhafte Wirkung der Druckabsenkung sowohl in den Druckräumen der Walzenmantel-Stützelemente als auch der Träger-Stützeinrichtungen nicht zu verlieren. Es zeigte sich, dass die Gefahr der Walzenmantel-Beschädigung erheblich reduziert ist, wenn die Verzögerungszeit in der Grössenordnung von etwa einer Zehntel-Sekunde liegt.The delay time of the delay circuit 35 is chosen such that after a pressure peak in the pressure chambers 22 of the individual roll shell support elements, due to the springback of the carrier, the pressure also in the most heavily loaded pressure chambers, preferably in the middle of the carrier, such as which has decreased to a safe level. Experience has shown that the delay time should be at least one hundredth of a second. On the other hand, the delay time should not be too long, that is to say generally not more than half a second, in order not to lose the advantageous effect of the pressure reduction in both the pressure spaces of the roll shell support elements and in the support devices. It was found that the risk of damage to the roller jacket is considerably reduced if the delay time is of the order of about a tenth of a second.

Eine besonders vorteilhafte Weiterbildung ergibt sich, wenn in einem besonders stark belasteten Druckraum 22, welcher beispielsweise etwa in der Mitte des Trägers 17 vorgesehen ist, ein geeigneter Drucksensor 36 vorgesehen ist, welcher die Verzögerungseinrichtung 35 zusätzlich ansteuert und bewirkt, dass die Umschalteinrichtung 32 erst dann ausgelöst wird, wenn nach einer Druckspitze im Druckraum 22 der Druck auf einen vorgegebenen Schwellenwert abgesunken ist. Auf diese Weise wird eine noch bessere Sicherheit gegen Beschädigungen des Walzenmantels erreicht.A particularly advantageous development results if a suitable pressure sensor 36 is provided in a particularly heavily loaded pressure chamber 22, which is provided, for example, approximately in the middle of the carrier 17, which additionally controls the delay device 35 and causes the switching device 32 only then is triggered when, after a pressure peak in the pressure chamber 22, the pressure has dropped to a predetermined threshold value. In this way, an even better security against damage to the roll shell is achieved.

Statt eines Drucksensors kann mit analogem Vorteil ein Sensor verwendet werden, welcher die Bewegung des Trägers 17 bei der Rückfederung misst, wobei als Fixpunkt beispielsweise das zugehörige Stützelement 21, der Walzenmantel 20 oder der Ständer 1 dienen kann. Hierbei wird die Verzögerungseinrichtung 35 durch den Sensor erst dann freigegeben, wenn der Träger 17 an der Messstelle um einen vorbestimmten Betrag zurückgefedert ist. Dieser Rückfederungsbetrag wird zweckmässigerweise so gewählt, dass dann die Druckspitze im Druckraum 22 so weit abgeklungen ist, dass beim Absenken des Trägers 17 keine Gefahr einer Beschädigung des Walzenmantels mehr besteht.Instead of a pressure sensor, a sensor can be used with an analogous advantage, which measures the movement of the carrier 17 during the springback, wherein the associated support element 21, the roller jacket 20 or the stand 1 can serve as a fixed point. In this case, the delay device 35 is only released by the sensor when the carrier 17 has rebounded at the measuring point by a predetermined amount. This amount of springback is expediently chosen such that the pressure peak in the pressure chamber 22 has decayed to such an extent that there is no longer any risk of damage to the roller shell when the carrier 17 is lowered.

Claims (9)

1. A method for separating the rollers of a calender having a stand (1) and a plurality of rollers (7, 8, 9, 10, 16) arranged one above the other, the lowermost roller (16) of which has a carrier (17) which is movable in a vertical direction by means of hydraulic supporting devices (18), but is mounted so as to be secure against rotation, and also a roller shell (20) which is rotatable about the carrier (17) and supported against the carrier (17) by at least one hydraulic element (21) and is movable in a vertical direction, both the pressure in the hydraulic supporting devices (18) and in the hydraulic roller shell-supporting elements (21) being lowered so that both the carrier (17) and the roller shell (20) are moved vertically downwards, characterised in that the pressure in the hydraulic supporting devices (18) is reduced compared with the pressure in the hydraulic roller shell-supporting elements (21) with a certain time lag.
2. A method according to Claim 1, characterised in that the time lag is at least one hundredth of a second.
3. A method according to Claim 1 or 2, characterised in that the time lag is no more than half a second.
4. A method according to Claim 1, characterised in that the time lag is substantially of one tenth of a second.
5. A method according to Claim 1, characterised in that the pressure distribution in the pressure chamber (22) of at least one roller shell-supporting element (21) is measured and the pressure drop in the pressure chambers (27) of the supporting devices (18) is only initiated once the pressure measured in the pressure chamber (22) of the roller shell-supporting element (21) has fallen below a predetermined value.
6. A method according to Claim 1, characterised in that the position of at least one point on the carrier (17) is measured and the pressure drop in the pressure chambers (27) of the supporting devices (18) is only initiated once the measured position of the carrier (17) has altered in a predetermined manner.
7. A control device for applying the method according to one of Claims 1-6 for separating the rollers of a calender with a switch-over mechanism (26) for lowering the pressure in the hydraulic roller shell-supporting elements (21) and a switch-over mechanism (32) for lowering the pressure in the hydraulic supporting devices (18), characterised by a delay mechanism (35) which only permits the pressure drop in the hydraulic supporting devices (18) with a given time lag after the pressure drop in the hydraulic roller shell-supporting elements (21).
8. A control device according to Claim 7, characterised by a pressure sensor (36) which is disposed in at least one pressure chamber (22) of a roller shell-supporting element (21), the pressure sensor (36) being connected to the delay mechanism (35) and controlling it so that the switch-over mechanism (32) for the pressure drop of the supporting devices (18) is only operated once the pressure measured in the pressure chamber (22) by the pressure sensor (36) has dropped below a predetermined threshold value.
9. A control device according to Claim 7, characterised by a position sensor at a point on the carrier (17) which measures the position of the carrier relative to a fixed point, and which is connected to the delay mechanism (35) and controls the latter so that it only triggers the switch-over mechanism (32) for the pressure drop in the supporting devices (18) once the measured position of the carrier (17) reaches a predetermined value.
EP87101615A 1986-02-18 1987-02-06 Process and regulating device for separating calander rolls Expired EP0242515B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87101615T ATE48668T1 (en) 1986-02-18 1987-02-06 METHOD AND CONTROL DEVICE FOR SEPARATING THE ROLLS OF A CALENDER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH655/86 1986-02-18
CH65586 1986-02-18

Publications (2)

Publication Number Publication Date
EP0242515A1 EP0242515A1 (en) 1987-10-28
EP0242515B1 true EP0242515B1 (en) 1989-12-13

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EP87101615A Expired EP0242515B1 (en) 1986-02-18 1987-02-06 Process and regulating device for separating calander rolls

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US (1) US4721039A (en)
EP (1) EP0242515B1 (en)
AT (1) ATE48668T1 (en)
CA (1) CA1264973A (en)
DE (2) DE3622398C1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3735243A1 (en) * 1987-10-17 1989-04-27 Escher Wyss Gmbh DEVICE FOR NEUTRALIZING OVERLOAD LOADS
JPH0211915A (en) * 1988-05-06 1990-01-17 Eduard Kuesters Mas Fab Gmbh & Co Kg Roll device
FI83346C (en) * 1989-01-27 1991-06-25 Valmet Paper Machinery Inc CALENDAR, SAERSKILT EN SUPERKALANDER.
DE3936128A1 (en) * 1989-10-30 1991-05-02 Escher Wyss Gmbh CALENDAR FOR SURFACE PROCESSING OF MATERIALS
DE4026773A1 (en) * 1990-08-24 1992-03-05 Voith Gmbh J M LINEAR POWER ADJUSTABLE MULTI-ROLLER GLOSSWORK
US7331278B2 (en) * 2005-11-07 2008-02-19 Stokes Jr Elbert Harvey System for a gas grill that allows it to cook fatty and slow cooking meats

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3777656A (en) * 1972-02-17 1973-12-11 Bruderhaus Maschinen Gmbh Calender and method of operating the same
DE2623492C3 (en) * 1976-05-26 1981-06-04 Küsters, Eduard, 4150 Krefeld Pressure control device for rolling equipment
JPS5557097A (en) * 1978-10-16 1980-04-26 Kleinewefers Gmbh Method and apparatus for rapidly separating calender roll
DE3004912C2 (en) * 1980-02-09 1982-07-08 Kleinewefers Gmbh, 4150 Krefeld calender
DE3004914C2 (en) * 1980-02-09 1982-07-15 Kleinewefers Gmbh, 4150 Krefeld calender
DE3004915C2 (en) * 1980-02-09 1982-07-15 Kleinewefers Gmbh, 4150 Krefeld calender
DE3007452C2 (en) * 1980-02-28 1984-09-20 Kleinewefers Gmbh, 4150 Krefeld Process for regulating the pressure exerted in a calender and calender for carrying out this process
DE3109536C3 (en) * 1981-03-13 1994-04-14 Escher Wyss Ag Control arrangement for a four-high metal rolling mill

Also Published As

Publication number Publication date
US4721039A (en) 1988-01-26
CA1264973A (en) 1990-01-30
DE3622398C1 (en) 1987-06-19
ATE48668T1 (en) 1989-12-15
DE3761154D1 (en) 1990-01-18
EP0242515A1 (en) 1987-10-28

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