Patent Application
20050098290
1. Field of the Invention
The invention relates to a method and an apparatus for influencing and/or monitoring the press pressure profile which results in the web running direction and/or transverse direction in an extended press nip used for the treatment of a material web.
2. Discussion of Background Information
Pressing apparatuses with devices for influencing the press pressure profile are disclosed, for example, by the documents DE 196 17 801 A, DE 197 14 939 A, DE 44 23 694 C2 and EP 0 345 501 B2.
The invention provides an improved method and an improved apparatus of the type mentioned at the beginning. At the same time, the method and the apparatus should as far as possible be capable of automation.
According to the invention, a method for influencing and/or monitoring the press pressure profile which results in the web running direction and/or transverse direction in an extended press nip used for the treatment of a material web is provided. State data relating to a profiling unit used for the press pressure profile setting based on the respective press pressure profile which results from a relevant state of the profiling unit is stored in a data storage device, and the stored state data is retrieved again in order to act specifically on the profiling unit.
On account of this design, extensive automation and even more reliable control and/or regulation of the relevant procedures are possible.
According to a preferred practical refinement of the method according to the invention, the relevant state data relating to the profiling unit is stored in the data storage device for a plurality of different press pressure profiles.
In order to set a respective press pressure profile, the state data of the profiling unit associated therewith is retrieved from the data storage device and the profiling unit is acted on in a corresponding manner.
By way of retrieving state data relating to the profiling unit from the data storage device, for example, respective presetting of the press pressure profile can also be performed. Precise setting of the press pressure profile can then be carried out.
According to a preferred practical refinement of the method according to the invention, by way of varying the action on the profiling unit, a respective predefinable press pressure profile is set, and the state data relating to the profiling unit which results, in this case, based on the respective predefinable press pressure profile, is stored in the data storage device.
State data relating to the profiling unit based on a respective press pressure profile which results during operation and/or dynamic conditions is preferably stored in the data storage device.
According to a preferred practical refinement, state data relating to the profiling unit based on a respective press pressure profile adapted to the respective production conditions for the purpose of optimising at least one material web property is stored in the data storage device.
In specific cases, it may be advantageous if state data relating to the profiling unit based on press pressure profiles for different operating phases, such as start-up, commissioning and/or the like, is stored in the data storage device.
Pressure profile control and/or regulation are preferably carried out. In this case, the data storage device can, for example, be assigned to the relevant control and/or regulating device or can be a part of this device.
In particular, for such pressure profile control and/or regulation and/or for pressure profile monitoring, the press pressure profile is expediently measured. In this case, this press pressure profile is preferably measured during operation and/or under dynamic conditions.
According to a further preferred refinement of the method according to the invention, the press pressure profile which results in the case of a respective predefinable state of the profiling unit is measured and is monitored for changes with respect to a predefinable standard. In this case, a press pressure profile which results during the operation of the relevant press unit is correspondingly monitored.
On the basis of the press pressure profile changes that are determined, a fault diagnosis can then be carried out, in particular, on the relevant press unit or parts thereof. Such a fault diagnosis can be based, for example, on the state of at least one endless belt guided through the press nip, in particular, a felt and/or the like, and it is therefore indirectly possible, for example, for the state of a relevant felt to be monitored. For instance, it is possible to detect in good time when the respective felt must be replaced.
The material web can be, for example, a fibrous web and, in particular, a paper, board or tissue web.
The relevant press nip can, for example, be used for dewatering and/or calendering the material or fibrous web.
According to the invention, moreover, a method for monitoring the press pressure profile which results in the web running direction and/or transverse direction in an extended press nip used for the treatment of a material web is provided. The method is characterized in that the press pressure profile is measured in the press nip.
According to the invention, there is provided a system for influencing and/or monitoring the press pressure profile which results in the web running direction and/or transverse direction in an extended press nip used for the treatment of a material web. The system comprises a measuring device for measuring the press pressure profile, a profiling unit used for the press pressure profile setting and a data storage device for storing the state data relating to the profiling unit based on a respective pressure profile which results from a relevant state of the profiling unit.
Moreover, the invention provides an apparatus for monitoring the press pressure profile which results in the web running direction and/or transverse direction in an extended press nip used for the treatment of a material web, wherein the apparatus comprises a measuring device for measuring the press pressure profile in the press nip.
As already mentioned, the data storage device can, for example, be assigned to a control and/or regulating unit for controlling or regulating the press pressure profile or for profile monitoring, or can be part of this unit.
In a preferred practical embodiment of the apparatus according to the invention, on at least one side of the press nip, there is provided a press shoe around which a press belt wraps and which is provided with pressure measuring holes assigned to the measuring device and opening into the region between press shoe and press belt in order to measure the press pressure profile. It is therefore possible, for example, for the oil pressure in the lubrication gap between the press shoe and the press belt to be measured. The press belt can, in particular, be formed by a flexible press belt or a flexible roll cover.
The measuring device expediently comprises at least one pressure sensor, which is arranged, in particular, in a press shoe, a press cover, a press unit located opposite a shoe press unit, such as an opposing roll, an item of clothing. The clothing can, in particular, be a felt, and/or the like.
In an expedient practical embodiment of the apparatus according to the invention, the profiling unit comprises at least one press shoe around which a press belt wraps and which can be adjusted, at least in the web running direction, in order to set the press pressure profile. In this case, at least one displacement transducer can be provided to determine the respective press shoe position. The relevant state data to be stored in the data storage device can then correspond, for example, to the respective press shoe positions.
The press shoe can be sectioned, as viewed in the transverse direction.
In a preferred practical embodiment, the press shoe can be acted on respectively section by section in the web running direction, as viewed in the transverse direction. It is thus possible via appropriate action on the press shoe for a plurality of press pressure profiles which result in the web running direction to be set simultaneously. The state data to be stored in the data storage device in the present case can also again correspond to the relevant settings.
In a further expedient embodiment of the apparatus according to the invention, on at least one side of the press nip, there is provided a circulating press belt, which can be acted on by at least two separately controllable pressing elements which are arranged one after another in the web running direction and via which the press pressure profile, can accordingly be influenced. At least one press shoe is preferably again provided between the press belt and the supporting elements. The press shoe can, in particular, again be flexible. The state data to be stored in the data storage device, in this case, can, in particular, also be representative of the respective action on the pressing elements. Otherwise, the relevant press unit can in particular be designed in such a way as is described in EP 0 345 501 B2, the disclosure of which is hereby incorporated by reference in the present disclosure.
In a further advantageous embodiment of the apparatus according to the invention, the profiling unit comprises at least one press shoe arranged on one side of the press nip and also provides for changing the contour of the press shoe which results in the web running direction and/or in the transverse direction. In this case, the shoe body preferably has at least one chamber to which pressure can be applied and/or which can be heated and/or cooled, in order to change the shoe contour in a corresponding manner. The state data to be stored in the data storage device, in this case, can be representative of the respective state of the relevant means that change the shoe contour.
The profiling unit can, in particular, also comprise at least one press shoe which is arranged on one side of the press nip and which can be acted on by at least one supporting or pressing element that can be displaced in the web running direction and/or transverse direction.
In principle, any desired combinations of the various embodiments are also conceivable. For example, a press shoe can be used which can both be adjusted and whose contour can be changed, and so on.
The apparatus according to the invention is used, in particular, for carrying out the method according to the invention. It can therefore, in particular, again be used for dewatering and/or calendering the material or fibrous web. Via the respectively stored state data, it is, in particular, also again possible for a respective predefinable state of the profiling unit, that is to say, for example, of the press shoe and/or supporting or pressing element arrangement, to be set, which means, in particular, that monitoring of the press pressure profile for any changes is also again possible. If the apparatus comprises a control and/or regulating unit, then the data storage device can, in particular, again be assigned to this unit or be part of this unit. A fault determined during the monitoring of the pressure profile can be signalled optically and/or acoustically. In principle, it is also conceivable that, when a corresponding fault is detected, the relevant machine is automatically switched off, which, for example, can again be carried out via the relevant control and/or regulating unit.
The invention also provides for a method for influencing and/or monitoring a press pressure profile along at least one of a web running direction and a transverse direction in an extended press nip used for treating a material web, wherein the method comprises storing, in a data storage device, data relating to a profiling arrangement which participates in producing the press pressure profile, retrieving the data, and acting on the profiling arrangement based on the data.
The acting may comprise controlling one of a movement and a position of the profiling arrangement. The storing data relating to a profiling arrangement may comprise storing data relating to a position of the profiling arrangement. The storing data relating to a profiling arrangement may comprise storing data relating to a current position of the profiling arrangement. The storing data relating to a profiling arrangement may comprise storing data relating to pressure applied by the profiling arrangement. The data may comprise data related to a plurality of different press pressure profiles.
The method may further comprise setting a press pressure profile. The method may further comprise presetting a desired press pressure profile. The may further comprise ensuring that the press pressure profile corresponds precisely to the desired press pressure profile. The ensuring may comprise changing an action of the profiling arrangement based on the data. The method may further comprise changing an action of the profiling arrangement based on the retrieving. The method may further comprising storing a predefined press pressure profile in the data storage device. The method may further comprise changing an action of the profiling arrangement based the predefined press pressure profile.
The storing may comprises storing data relating to the press pressure profile which results during at least one of operation and dynamic conditions. The data may be used to optimise at least one material web property. The data may comprise data related to a plurality of press pressure profiles. The plurality of press pressure profiles may comprise press pressure profiles for different operating phases. The different operating phases may comprise at least a start-up phase and a commissioning phase.
The method may further comprise controlling and/or regulating the press pressure profile. The method may further comprise measuring and/or monitoring the press pressure profile. The method may further comprise measuring the press pressure profile during at least one of operation and dynamic conditions. The method may further comprise measuring and monitoring the press pressure profile and determining changes which occur between the press pressure profile and a predefine press pressure profile. The measuring and monitoring may occur during operation. The method may further comprise carrying out a fault diagnosis during the determining. The fault diagnosis may be based on a state of one of a part of the extended nip press and the extended press nip. The fault diagnosis may be based on a state of at least one endless belt guided through the extended press nip. The at least one endless belt may comprise a felt.
The material web may comprise a fibrous material web. The fibrous material web may comprise one of a paper web, a board web, and a tissue web. The extended press nip may be arranged to at least one of dewater the material web and calender the material web. The method may further comprise measuring the press pressure profile in the extended press nip.
The invention also provides for a system for influencing and/or monitoring a press pressure profile along at least one of a web running direction and a transverse direction in an extended press nip used for treating a material web, wherein the system comprises a measuring device for measuring the press pressure profile, a profiling arrangement which participates in producing the press pressure profile, and a data storage device for storing data related to the profiling arrangement.
The measuring device measures the press pressure profile in the extended press nip. The system may further comprise a press shoe arranged on at least one side of the extended press nip and a press belt guided through the extended press nip. The press shoe may comprise pressure measuring holes. The pressure measuring holes may open out to the press belt and are associated with the measuring device.
The measuring device may comprise at least one pressure sensor. The at least one pressure sensor may be arranged in one of a press shoe, a press cover, and a press unit located opposite the pressing arrangement. The at least one pressure sensor may be arranged in one of a belt, a felt, and an opposing roll located opposite the pressing arrangement. The profiling arrangement may comprise at least one press shoe around which a press belt wraps. The at least one press shoe may be adjustable at least in the web running direction, whereby adjustment of the at least one press shoe sets the press pressure profile. The system may further comprise at least one displacement transducer arranged to determine a position of the at least one press shoe. The at least one press shoe may comprise a sectioned press shoe arrangement. The sectioned press shoe arrangement may be sectioned along the transverse direction. The at least one press shoe may produce a plurality of press pressure profiles along the transverse direction.
The system may further comprise a plurality of pressing device which press the at least one shoe press and produce the plurality of press pressure profiles along the transverse direction. The system may further comprise a circulating press belt and at least two separately controllable pressing elements for influencing the press pressure profile. The at least two separately controllable pressing elements may be arranged one after another in the web running direction. The profiling arrangement may comprise at least one press shoe, and wherein the at least one press shoe is arranged between the circulating press belt and the at least two separately controllable pressing elements.
The profiling arrangement may comprise at least one press shoe arranged on one side of the extended press nip and an arrangement for changing a contour of the at least one press shoe along at least one of the web running direction and the transverse direction. The at least one press shoe has at least one chamber, and wherein the at least one chamber is at least one of adapted to receive pressure therein, adapted to be heated, and adapted to be cooled, whereby the contour can be changed.
The profiling arrangement may comprise at least one press shoe arranged on one side of the extended press nip and at least one pressing element. The at least one press shoe is displaceable along at least one of the web running direction and the transverse direction.
The invention also provides for a system for influencing and/or monitoring a press pressure profile in an extended press nip used for treating a material web, wherein the system comprises a device for measuring the press pressure profile in the extended press nip, a press shoe which participates with an opposing device to produce the press pressure profile, a data storage device for storing data related to at least one of a position of the press shoe and the press pressure profile, and an arrangement for at least one of moving the press shoe based on the data and moving the press shoe based on the measured press pressure profile.
The invention also provides for a method for influencing and/or monitoring a press pressure profile along at least one of a web running direction and a transverse direction in an extended press nip used for treating a material web, wherein the method comprises storing, in a data storage device, data relating to a profiling arrangement comprising a press shoe, wherein the press shoe participates in producing the press pressure profile, retrieving the stored data, and moving the press shoe based on the retrieved data, wherein the stored data comprises at least one of the press pressure profile and a position of the press shoe.
The invention will be explained in more detail in the following text by using an exemplary embodiment and with reference to the drawings, wherein:
The apparatus 10 comprises at least one press shoe 14 which is arranged on one side of the press nip 12 and can be adjusted in the web running direction L. A press belt 16, which can, in particular, be the press cover of what is known as a shoe press roll, wraps around the press shoe 14. In addition, the press shoe 12 is acted on in the direction of an opposing surface 20 by at least one pressing element 18. The press nip 12 is therefore provided between the press belt 16 and the opposing surface 20 which, for example, can be formed by an opposing roll 22.
The press shoe 14 can, in particular, be continuously adjustable in the web running direction L.
The profiling unit used for the press pressure profile setting here therefore comprises, in particular, the press shoe 14 and the at least one pressing element 18.
The apparatus 10 also comprises a data storage device 23 for the storage of state data relating to the profiling unit 14, 18 based on a respective pressure profile which results from a relevant state of the profiling unit 14, 18.
For the purpose of appropriate setting of the press shoe 14, at least one adjustable wedge-shaped bar 24 extends generally transversely with respect to the web running direction L and is arranged behind the press shoe 14, as viewed in the web running direction L. The press shoe 14 is urged against the wedge-shaped bar 24 as a result of the friction occurring in the web running direction L between it and the circulating press belt 16. Here, the press shoe 14 can be provided with at least one stop 26, via which it bears on this wedge-shaped bar 24.
During the operation of the relevant shoe press, the press shoe 14 therefore bears continually on the wedge-shaped bar 24, so that a respective shoe adjustment in the web running direction L is possible at any time via the wedge-shaped bar 24.
As can be seen, in particular, in
In order to adjust the wedge-shaped bar 24, a driven spindle 28, for example, can be provided. The spindle 28 can, for example, be driven by a hydraulic motor 30 or the like.
The wedge-shaped bar 24 is mounted on a supporting element 32, on which the pressing elements 18 acting on the press shoe 14 in the direction of the opposing surface 20, which can be, for example, cylinder/piston units (see
As can be seen, in particular, in
In principle, however, a plurality of wedge-shaped bars 24, that is to say at least two, extending generally in the transverse direction in each case, can also be provided. As viewed in the transverse direction, these can be arranged beside one another in a line, for example. In this case, a respective wedge-shaped bar 24 can, in each case, interact with one or more stops 26 assigned to the press shoe 14. The various wedge-shaped bars can at least partly be driven separately.
The drive force is transmitted to the wedge-shaped bar 24 from the spindle 28 via a movement thread 36. In this case, this movement thread 36 can be designed in such a way and the wedge angle can be selected in such a way, such that when there is no drive, a respective wedge-shaped bar setting and, correspondingly, a respective shoe setting, is secured by way of self-locking.
The current position of the press shoe 14 is measured by one or more displacement transducers 42 (see
The press shoe 14 can, in particular, be set in the respectively desired manner via a control and/or regulating device 44, for example, by falling back on the state data stored in the data storage device 23. As can be seen in
The press shoe 14 can be provided with pressure measuring holes 46 opening into the region between press shoe 14 and press belt 16 in order to measure the pressure profile which results in the web running direction L. As can be seen in
In principle, in particular, state data relating to the profiling unit 14, 18 based on the respective press pressure profile matched to the respective production conditions, in order to optimise at least one material web property, can also be stored in the data storage device 23. It is also possible, in particular, for press pressure profiles for different operating phases, such as the start-up of the relevant machine, in particular, papermaking machine. The commissioning and/or and the like of the profiles can be stored.
By way of the control and/or regulating device 44, at least one desired press pressure profile can expediently be predefined. For respective equalization between the current profile and the desired profile, it is again possible, in particular, to fall back on the state data stored in the data storage device 23. The profiling unit 14, 18 is therefore acted on in accordance with the retrieved state data, in order, for example, to obtain a respective presetting. If necessary, a respective precise adjustment can then be carried out.
Therefore, for example, a design of the apparatus 10 in which the press pressure profile which results in the web running direction L can be controlled and/or regulated via an appropriate adjustment of the press shoe 14 is also conceivable, for which purpose, in particular, the respective stored state data can also be used as well.
Alternatively or additionally, monitoring of the press pressure profile is also possible, in which the press pressure profile which results in a predefinable state of the profiling unit is measured and is monitored for changes, for example with respect to a predefinable standard. The relevant state of the profiling unit 14, 18 can, in particular, be produced again by the relevant state data being retrieved from the data storage device 23 and the profiling unit 14, 18 being acted on in a corresponding manner. In this case, the press pressure profile which results during the operation of the apparatus 10 is preferably again monitored in a corresponding manner.
On the basis of the press pressure profile changes detected, it is then, in particular, possible for a fault diagnosis relating to the pressing unit or parts thereof to be carried out. Here, such a fault diagnosis can, for example, be based on the state of at least one endless belt 16 led through the press nip 12, for example a felt and/or the like. It is also possible, for example, to determine in good time when the relevant felt must be replaced. This can also again be signalled acoustically and/or optically, for example.
The press shoe 14 can be designed to be continuous or sectioned, as viewed in the transverse direction.
If a plurality of stops 26 assigned to the press shoe 14 are driven individually via a plurality of drives, for example, respectively formed by a hydraulic motor 30, different pressure profiles can also be set simultaneously, in order, for example, to improve the transverse moisture profile. These settings can, in particular, also be made again by using state data relating to the profiling unit 14, 18 stored in the data storage device 23.
Via pressure measuring holes 48 provided in the press shoe 14 (see
The setting of the press pressure profile which results in the web running direction L can be carried out, for example, as a function of specific operating conditions, such as the respective type of felt, the respective paper grade and/or the like. For this purpose, the relevant state data can again also be stored in the data storage device 23.
In combination with the setting or control and/or regulation of the press pressure profile, which results in the web running direction L, the press pressure transverse profile can also be controlled and/or regulated in the respectively desired manner, in particular, via the various pressing elements 18. For this purpose, corresponding state data relating to the profiling unit 14, 18 can again be stored in the data storage device 23.
The press belt 16 or the press shoe 14 can, for example, also be acted on via at least two pressing elements 18 which are arranged one after another in the web running direction L (not shown) and can be driven separately, in order to influence the press pressure profile in a corresponding manner. For instance, a design in which one or more pressing elements 18 can be displaced, for example, in the web running direction L and/or in the transverse direction, in particular, with a positionally stable press shoe 14, is also conceivable. In these cases, too, corresponding state data relating to the profiling unit 14, 18 can again be stored in the data storage device 23, in order to be retrieved again later in order to act on the profiling unit 14, 18 in a corresponding manner.
The press profiles shown in the graph can be provided for three different products, for example, and, in particular, can at least substantially be predefined by way of state data for the relevant profiling unit stored in the data storage device. The relevant curves can be produced by displacing the press shoe 14 in the web running direction L.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202 18 393.9 | Jun 2002 | DE | national |
| 102 60 202.6 | Dec 2002 | DE | national |
| 102 28 308 | Jun 2002 | DE | national |
The instant application is a continuation of International Application No. PCT/EP2003/050204 filed on May 28, 2003 and published as International Publication WO 2004/001124 on Dec. 31, 2003, the disclosure of which is hereby expressly incorporated by reference hereto in its entirety. The instant application also claims priority under 35 U.S.C. §119 of German Application Nos. 202 18 393.9 filed on Jun. 25, 2002 and 102 60 202.6 filed on Dec. 20, 2002.
| Number | Date | Country | |
|---|---|---|---|
| Parent | PCT/EP03/50204 | May 2003 | US |
| Child | 11020082 | Dec 2004 | US |
