EP3286375A1

EP3286375A1 - Method and device for monitoring a wear structure, in particular a sealing structure

Info

Publication number: EP3286375A1
Application number: EP16717405.1A
Authority: EP
Inventors: Marc Erkelenz; Jochen Honold; Christian GOMMERINGER; Samee FARAJI
Original assignee: Voith Patent GmbH
Current assignee: Voith Patent GmbH
Priority date: 2015-04-23
Filing date: 2016-04-21
Publication date: 2018-02-28
Anticipated expiration: 2036-04-21
Also published as: EP3533925B1; EP3286375B1; EP3533925A1; CN107532381A; CN107532381B; US20180119355A1; US10392750B2; WO2016170042A1; CN110273314B; EP3461949A1; CN110273314A

Abstract

The invention relates to a method for monitoring a wear structure in a machine for generating or processing a fibrous material web, wherein the wear structure comprises at least one wear element, characterised in that the method comprises the following steps: a) providing the time (z0) at which the wear element became operational; b) providing the time (z1) at which a defined first wear level of the wear element was reached; c) providing at least one further characteristic variable (K1); d) forecasting a remaining operating time of the wear element from the information of the times z0 and z1, in particular from the time difference between z0 and z1, as well as from the at least one further characteristic variable (K1) by means of a computer system. The invention also relates to a device for carrying out said method.

Description

Method and device for monitoring a wear device, in particular a sealing device

The invention relates to a method for monitoring a wear device, in particular a sealing device in a machine for producing or processing a fibrous web according to the preamble of claim 1 and a device for monitoring a sealing device according to the preamble of claim 13. In machines for the production of paper or cardboard comes a variety of vacuumed rollers used. In these suction rolls usually one or more suction zones must be sealed against the inner wall of the roll shell to prevent excessive drop of the negative pressure and thus to reduce the suction effect. In practice, this sealing is usually done by so-called sealing strips, which are pressed with a certain pressure against the inner wall of the roll shell. These sealing strips are in frictional contact with the roll shell, and are thus exposed to relatively high wear by abrasion. To reduce wear, for example, from DE 10 2012 207 692 known to introduce a lubricant between the roll shell and sealing strip. However, since the wear can not be completely eliminated, the sealing strips must be replaced after a certain time. Due to the installation situation of the sealing strips in the suction roll, the current state of wear of the sealing strip in general but can not or only very roughly determined without opening the suction roll, and thus to interrupt the production process. Since it can cause damage to the suction roll at too late replacement of the sealing strips, the sealing strips are often replaced well before the end of their operating time, which is associated with increased costs. Therefore, it is desirable from an economic point of view to obtain a more accurate information about the state of wear of the sealing strip during operation. From the prior art, for example, DE 10 2012 208 81 1 is known To integrate sensors into the sealing strip, which provide information about the degree of wear during operation of the suction roll. In addition, it is proposed in WO 03/056215 to determine from the knowledge of the installation time of the bar and the current wear an estimate of the remaining operating time of the sealing strip.

These systems, however, have the deficiency that the wear of the sealing strips usually does not occur uniformly over time, and the estimation of the remaining operating time is only marginally more accurate than the expertise of the papermaker.

Object of the present invention is to propose a method that allows a much more accurate prediction of the remaining operating time of a wear element, in particular a sealing strip, as the method known from the prior art.

The object is fully achieved by a method for monitoring a wear device, according to the characterizing part of claim 1, and by a device for monitoring a sealing device according to the characterizing part of claim 13.

The method according to the invention describes a method for monitoring a wear device in a machine for producing or processing a fibrous web. The wear device comprises at least one wear element, which is exposed to wear in particular by frictional contact. The sealing device may also include other components such as holders for the at least one wear element or means for pressing the wear element to a moving surface or means for moving the wear element beyond. A particularly preferred embodiment of this method according to the invention is a method for monitoring a sealing device for sealing at least one under or overpressure zone adjacent to a surface moved in a movement direction in a machine for producing or processing a fibrous web. The sealing device comprises at least one sealing element, which is in frictional contact with the moving surface and is thus exposed to wear. The sealing device may also include other components such as holders for the at least one sealing element or means for pressing the sealing element to the moving surface beyond.

In a particularly preferred embodiment of the method, the moving surface around the rotating shell is a suction roll and the sealing element or the sealing elements are sealing strips which are pressed against the roll shell for sealing. However, other sealing devices are conceivable, such as the sealing of a suction box on a moving fabric.

For carrying out the method according to the invention, a point in time zO is provided at which the wear element or the sealing element was installed or went into operation. The provision of this or another time can be done either automatically, or by manual input. Furthermore, a time z1 is provided at which a defined first level of wear of the wear element or the sealing element has been achieved. The difference between these two times describes the time that has elapsed before reaching the specified level of wear. By means of an extrapolation, for example a linear extrapolation, a first estimate for the remaining operating time of the wear element or of the sealing element can already be obtained. For example, one could conclude: 50% wear in n days, resulting in 100% wear in 2 times n days. However, it shows that the wear of the wear element or the sealing element is not necessarily uniform over time. For example, a prolonged shutdown of the machine or the Increased production of grades where the machine can only be operated at a slower speed, etc., resulting in significantly overestimating or underestimating the remaining operating time of the sealing element. Therefore, it is provided according to the invention that at least one further parameter K1 is provided, which contains, for example, information about one or more aspects which contribute to an uneven wear of the wear element or the sealing element. This can be data on the machine speed or standstill times in the operating period of the wear element or the sealing element. However, other data may also be relevant and be provided as a further characteristic K1. Exemplary but not exhaustive are listed here: information of lubricant monitoring, change in the inner roughness of the roll shell, number of roll revolutions, contact pressure of the sealing strip, etc .. The prediction of a remaining operating time of the wear element or the sealing element according to the invention using the times zO and z1 or the difference time between zO and z1 and the at least one further characteristic K1 by means of a computer system. Thus, it is possible to calculate a significantly improved prediction of the remaining operating time of the wear element, or the sealing element, than is possible only on the basis of the time information. As an example, only the very simple approach is described here, that instead of the operating time z1 -z0, an effective operating time of the sealing element is used, that is to say the time z1 -z0 minus the standstill times of the machine in this period. This effective operating time can then be extrapolated linearly, for example, as described above.

Alternatively, it is also possible to describe the effective operating time over the number of roller revolutions in the period z1 -z0. By extrapolation, an estimate can then be made as to how many roller revolutions the sealing element can still be used. This can be converted into a remaining operating time based on an average speed or the current speed. However, a multiplicity of other methods for calculating the prediction of a remaining operating time are also conceivable according to the invention. After prediction of the remaining operating time of the wear element or of the sealing element has been made in the provision of the time z1, this prediction can be continuously monitored and corrected, for example, due to changes in the further characteristic K1 and of course taking into account the current date or the current time become.

Further advantageous embodiments of the invention are described in the further subclaims.

Thus, it may be advantageous in preferred embodiments of the invention that in addition to the characteristic K1 additional, additional characteristics K2, K3, K4 ... are provided and these parameters are included in the prediction of the remaining operating time of the wear element or the sealing element. With the help of these additional additional parameters, the quality of the prediction can be further improved in many cases. Depending on the application, up to four parameters, or up to eight such parameters or even more than eight such further parameters can be included in the prediction of the remaining operating time.

In advantageous embodiments of the invention, the parameter K1 and / or one or more of the additional additional parameters K2, K3, K4 can describe one or more aspects of the mode of operation of the machine. In particular, the mode of operation of the machine since the time when the sealing element went into operation can be described by these characteristics. However, it can also be provided that the characteristics also include information from the time before installation of the wear element or the sealing element. In particularly advantageous embodiments, information about future operating modes of the machine can also be provided as a further parameter. This may, for example, be data from production planning, such as a standard variety schedule, or information about planned shutdowns, etc. It may be provided, for example, that the further parameter K1 and / or one or more of the additional further parameters K2, K3, K4 ... the machine speed, the operating times of the machine, the standstill times of the machine, the type and / or quantity of the products produced, describe the contact pressure of the sealing element on the moving surface. However, other or more sizes are possible.

It should be mentioned that these data, which are used for the parameters K1, K2, K3, K4, ..., come from different sources and that the characteristics can be described by means of different measured values. Thus, the machine speed can be present directly as the production speed of the machine in m / min. But it can also be e.g. in the form of the rotational speed of a suction roll, the speed of one or more drives or the like are described. Also, the number of roller revolutions from a certain point in time can be used as a description of the machine speed. These data all describe the production speed of the machine and, if necessary, to the knowledge of geometric variables such as a roll circumference or the like. very easy to convert into each other. It is clear to the person skilled in the art that these different descriptions of the same property are identical for their use as parameter K1, K2, K3, K4. The same applies to an alternative description of the data describing the standstill times of the machine, the type and / or quantity of the products produced, the contact pressure of the sealing element on the moving surface, etc.

Due to the combinations of several parameters, a large number of advantageous data can be used to determine the remaining operating time of the sealing element. Here are some examples.

Thus, in an advantageous embodiment, for example, be provided that the parameter K1 is a size that describes the machine speed, and the characteristic K2 describes the type and / or amount of products produced or the contact pressure of the sealing element to the moving surface. In a further advantageous embodiment, it can be provided, for example, that the parameter K1 indicates the number of roller revolutions since a specific time (eg the installation of the sealing element) -a type of description of the machine speed-and the parameter K2 describes the internal roughness of the roller shell.

A parameter K3, which contains information about the lubricant supply of the sealing element (for example, the amount of lubricating water), can be used in both cases in addition to or as a substitute for one of the parameters K1 or K2.

The combinations of parameters shown here do not form a conclusive enumeration of the possible combinations according to the invention, but are merely intended to document the possibilities of embodiment of the method according to the invention by way of example.

The provision of the data can be carried out according to the invention in various ways. For example, it may be provided that the further parameters are continuously retrieved and stored in a database. This database can be created, for example, on the computer of the computer system on which the calculation is made, or else on another computer. It can also be provided that this other computer is not operated by the operator of the paper machine, but by another operator, and the data is transmitted to this database. In a further advantageous embodiment of the invention, after the time z1 at least one further time z2, preferably several further times z3, z4, ... are provided, at which a fixed second, third, fourth, ... wear level has been reached, wherein each time the provision of a new time, the remaining operating time can be redetermined taking into account all already provided time points and the further characteristic or the other parameters. The provision of further times at which a specified level of wear has been achieved is therefore advantageous since so that the accuracy of the prediction of the remaining operating time is further improved. Especially towards the end of the life of the sealing element, this is advantageous in order to select the best possible time for the replacement of the sealing element.

It is particularly advantageous if the provision of at least one of the times z1, z2, z3, z4..., Preferably of all points in time which are used to predict the remaining operating time, is effected by a signal which is emitted by a sensor in the wear element or in the wear element the sealing element is transmitted directly or indirectly to the computer system. Usually, for economic reasons, a maximum of two or three sensors will be used in a sealing element. However, more than three sensors in a sealing element are possible.

Furthermore, it can advantageously be provided that at least one of the further parameters K1, K2, K3, K4..., Preferably several of the further characteristic variables K1, K2, K3, K4..., Is provided by a control system which is also used for monitoring, Control and / or regulation of the machine is used.

For the method, it may be advantageous if one of the wear levels between 80% and 50% residual wear is set. The exact knowledge of the achievement of a comparatively early level of wear makes it possible to determine very early a first prediction of the remaining operating time of the wear element or of the sealing element. Likewise, it may be advantageous for the method if one of the wear levels is set between 20% and 10% residual wear, preferably between 20% and 15% residual wear. The exact knowledge of the achievement of a comparatively late wear level allows a more accurate prediction of the remaining operating time of the wear element or the sealing element.

Furthermore, it may be advantageous that the remaining operating time is displayed on a display device. In a further variant according to the invention, the method can additionally comprise the steps: d) Determining at least one threshold value for the remaining operating time e) Checking whether the remaining operating time falls below the at least one defined threshold value

f) generating a warning signal if the remaining operating time falls below the at least one specified threshold value.

Such a threshold value may, for example, be chosen such that a routine standstill of the machine always occurs in the remaining operating time, in which case the sealing element can be exchanged. The threshold value can also be chosen so that the operator still has enough time to reorder a new wear element or sealing element. It is also possible to specify several thresholds at which signals for different actions are generated. (e.g., a signal to initiate an order and a later signal to plan the replacement of the sealing element).

The generated notification signal or one of the generated indication signals can be displayed, for example, on an optical or acoustic display device and / or forwarded to another computer system. For example, according to the invention, such a signal can be forwarded to an electronic procurement system or procurement system.

In advantageous embodiments of the method, the prediction of a remaining operating time of the wear element or of the sealing element can take place in the form of a single value or in the form of an interval. A combination of both is possible. For example, it may be provided that, in addition to the estimated remaining operating time, a lower limit and an upper limit for the remaining operating time are specified. these can For example, be determined on the assumption that one or more of the other parameters K1, K2, K3, K4 ... change in the future by a certain percentage. As an example, let us mention the possibility that the lower limit indicates the remaining operating time if the average machine speed increases in the future by 5% or 10% or the average downtime of the machine is reduced by 5% or 10%. Analogously, the upper limit would be the remaining operating time in the event that the average machine speed is reduced by 5% or 10% or the average downtime of the machine is increased by 5% or 10%.

In this way, the operator receives an indication of the reliability of the estimate as well as an indication of the extent to which he can influence the remaining operating time by changing the operating mode of the system. For example, this can be helpful in the question of whether the sealing element can still remain installed until the next scheduled standstill, if one produces at a somewhat increased speed.

Furthermore, the invention comprises a device for monitoring a sealing device for sealing at least one under or overpressure zone adjacent to a moving surface in a movement direction in a machine for producing or processing a fibrous web. The device comprises at least one sealing element with at least one, preferably a plurality of wear sensors, a computer system and means of signal transmission from the at least one wear sensor to the computer system. According to the invention, the computer system is used to predict the remaining operating time of the sealing element by means of a method according to one of claims 1 to 12.

In an advantageous embodiment of the device, the at least one sealing element may comprise or consist of a sealing strip. The sealing element, in particular also the sealing strip, comprises, according to an advantageous embodiment, at least one wear sensor indicating a level of wear between 80% and 50% residual wear and / or a wear sensor indicating a wear level between 20% and 10% residual wear.

According to a further advantageous embodiment, the device comprises a display device which displays the remaining operating time of the sealing element. It can also be provided that the device does not include its own display device, but shares a display device with other devices. Thus, for example, the display device may be a screen in a control room of the machine, on which other values are displayed in addition to the remaining operating time or in alternation therewith. In a preferred embodiment, it can be provided that the at least one wear sensor comprises at least one hose which is filled with a medium and is destroyed as the wear of the sealing element progresses. The resulting pressure drop can be detected and can serve as an indication that - depending on the installation position of the hose - a certain level of wear is reached.

In a further preferred embodiment, it can be provided that the at least one wear sensor comprises at least one optical waveguide or an electrical conductor, which is destroyed as the wear of the sealing element progresses.

Here, a change in the electrical resistance or an interruption of the current flow or a reduction or interruption of light transmission can be determined and can serve as an indication that - depending on the installation position of the conductor - a certain level of wear is reached.

In a further advantageous embodiment of the invention can be provided that the at least one wear sensor comprises a temperature sensor or from it consists. Such a temperature sensor can perform a dual function. On the one hand, it provides data on the temperature of the sealing element, eg the sealing strip at the installation position of the temperature sensor. With progressive wear of the sealing element of the temperature sensor can then be damaged or destroyed. Thus, for example, the absence of a temperature measuring signal of the temperature sensor can give an indication that the wear of the sealing element has progressed to the installation position of the temperature sensor. Frequently, by means of such a temperature sensor even before the destruction of the sensor due to wear, an increase in the temperature can be measured. Also from the knowledge of this temperature increase information about the state of wear of the sealing element can be obtained.

Another wear device which can be monitored by means of a method according to the invention is a sorter for the treatment of a pulp suspension. The screen baskets used there are wear elements, which must be replaced after some time. The exact state of wear of the strainer basket can not be seen from the outside. In particular, the most accurate prediction possible of the remaining operating time of the screen basket is very desirable.

An apparatus which can be used for the use of the method according to the invention is described below in a further inventive idea. This relates to a system for monitoring the condition of a screen basket of a sorter for treating a pulp suspension.

The aim of sorting is the separation of interfering solid constituents from pulp suspensions. The separation is carried out by screening according to the particle characteristics of size, shape and deformability. The sorting is an important separation process in the processing of waste paper. Depending on the degree of dissolution and the loading of the suspension with foreign matter and fiber fins different sorters are used. Among other things, so-called basket sorters are used with a screen basket arranged in a housing. In the basket sorters known hitherto, the technical data of the screen basket are taken on an end ring of the screen basket. Since the screen basket is arranged in the housing of the respective sorter, the reading of these specifications is relatively expensive. In addition, the state of wear of the strainer basket remains uncertain, especially as there is no curriculum vitae or history for the baskets and no operating data is available.

The further inventive idea is based on the object of providing a system for monitoring the condition of a screen basket of a sorter for treating a pulp suspension, in which the aforementioned problems are eliminated. In particular, a faster error-free readout of the screen basket relating to technical data is to be ensured and a more comprehensive monitoring of the state of the screen basket from the outside is made possible.

The object of the further inventive idea is solved by a system having the features of sentence 1. Preferred embodiments of the system according to the invention will become apparent from the following sentences, the present description and the drawings.

The system for monitoring the state of a screen basket of a sorter for treating a pulp suspension comprises, according to the further inventive idea, a wireless identification unit assigned to the screen basket arranged in a sorter housing and an external, in particular mobile reading unit for non-contact reading of technical data relating to the screen basket from the screen Identification unit and for establishing a connection with another external data bank containing the sorter data.

Due to this design, the technical data relating to the screen basket can be read out quickly and reliably from outside, ie from outside the sorter housing, in a cable-free and non-contact manner. In addition, via the external reading unit on further contained in an external database further the sorter data is accessed, allowing a more comprehensive monitoring of the state of the screen basket. In this case, a corresponding screen basket information can be read into the external database when installing the screen basket. During the subsequent readout of the technical data relating to the screen basket from the identification unit assigned to the screen basket, the required assignment of data contained in the database to this screen basket can then be established. The further data relating to the sorter can, for example, be collected via a control system of the factory in which the sorter is installed and supplied to the external database. Sales staff and customers can each be given a particular mobile reading unit, so that they can control the screen basket from the outside, ie from outside the housing.

Preferably, a respective reading unit comprises a display for displaying further data relating to the sorter retrieved from the external database.

According to an expedient practical embodiment of the system, the identification unit comprises at least one RFID chip (RFID = radio-frequency identification). Such an RFID chip in particular represents a transponder which contains the technical data relating to the screen basket. The transponder is a radio communication device that receives incoming signals and automatically answers. The coupling can be done by magnetic field generated by the reading unit short range or by high-frequency radio waves. This not only allows data to be transferred, but also the transponder can be supplied with energy. For larger ranges, for example, an active RFID chip with its own power supply is conceivable.

The reading device may contain software which controls the actual reading process for reading out the technical data relating to the screen basket from the identification unit or the RFID chip. In addition, the reading unit may comprise an RFID middleware with an interface to the external database. The identification unit preferably comprises at least one RFID chip assigned to the screen basket of the sorter. According to an expedient practical embodiment of the system according to the further inventive concept, the identification unit comprises both an RFID chip assigned to the screen basket of the sorter and an RFID chip assigned to the housing of the sorter, wherein the RFID chip assigned to the screen basket is connected via a software coupling can be coupled to the RFID chip associated with the housing and the RFID chip assigned to the housing can be read out via the reading unit.

In this way, the reading unit can establish a connection between the RFID chip assigned to the housing and the external database. The connection between the RFID chip and the external database is not affected in this case by the usually metallic case of the sorter.

According to an alternative embodiment of the system, however, the RFID chip associated with the screen basket of the sorter can also be read out via the reading unit.

In particular, in the event that the RFID chip associated with the screen basket of the sorter can be read out directly via the reading unit, the RFID chip assigned to the screen basket of the sorter is preferably arranged in the region of the opening of the sorter which can be closed by a cover. In order to read out the relevant RFID chip, the lid of the sorter can then be removed, whereupon the RFID chip associated with the screen basket of the sorter can be read out directly by means of the reading unit.

The RFID chip associated with the screen basket of the sorter can, in particular, be arranged on or in an end ring of the screen basket. In particular, for the aforementioned reasons, it is advantageous if the RFID chip associated with the screen basket of the sorter is arranged on or in one of the openings of the screen basket which can be closed by a lid of the sorter.

Here, the screen basket of the sorter associated RFID chip is preferably arranged on the opening of the sorter facing the top of the end ring. It is also particularly advantageous if the RFID chip assigned to the screen basket of the sorter is arranged on the radial inner side of the end ring, thus further improving the accessibility of the RFID chip for coupling the reading unit. For example, such an embodiment is conceivable in which the RFID chip assigned to the screen basket of the sorter is accommodated sunk in the end ring. In this case, the sunk in the end ring of the screen basket housed RFID chip is preferably encapsulated with plastic or preferably Teflon. Such a cover is convenient because the strainer basket is typically recycled, i. especially chromed and electropolished.

The mentioned arrangement of the sieve basket of the sorter associated RFID chips on or in an end ring of the screen basket, inter alia, the fact that the end rings of a Stabsiebkorbes with running between these end rings rods are subject to less wear than the rods.

The other data relating to the sorter are preferably stored together with the technical data relating to the screen basket in the external database. By means of the technical data read out from the identification unit assigned to the sieve basket, the assignment to the other data relating to the sorter can thus be established in the external database. According to a preferred practical embodiment of the system according to the further inventive concept, the further data relating to the sorter via the reading unit include production data of the screen basket, cv basket cv data, sorter operation data, wear data of the screen basket and / or the like.

The manufacturing data of the screen basket may contain, for example, data relating to the construction, the material, the size, etc. of the screen basket. The cuvette's cv data may include, for example, data regarding reprocessing of the screen basket, storage times, etc. The operating data of the sorter include, for example, the running time, the flow / pressure at the inlet / outlet of the sorter, the rotational speed, etc. This information can be obtained, for example, via the machine control of the sorter.

It is also of particular advantage if the system according to the invention comprises data processing means for determining the baskets' throughput, the speed of rotation of the strainer basket, the energy balance between the input and the outputs of the sorter and / or the like on the basis of the service life of previous screen baskets To determine the degree of wear of the screen basket and thus the next change date for the screen basket. In particular, it may be advantageously provided that a prediction of the remaining operating time of the screen basket is determined by means of the method on the basis of this data.

A system for monitoring the state of a screen basket of a sorter according to the further inventive idea can be used in a plant for producing a

Fibrous web either alone or in combination with a

Device according to the invention for monitoring a sealing device are used. Among other things, such a combination offers the advantage that the operator thereby gains a more comprehensive knowledge of the current state of essential wearing parts in his system. For example, a optimized standstill planning. A planned plant downtime can then for example be set so that sealing strips and baskets can be replaced together.

In the following, essential features of the further inventive idea will be described again in a compact form on the basis of numbered, mutually referenced sentences. The parenthesized reference numerals refer to Figures 3 and 4.

The further inventive idea is then explained in more detail using an exemplary embodiment with reference to the drawing.

sentences

Sentence 1. System (10) for monitoring the condition of a screen basket (12) of a sorter for treating a pulp suspension, with a in a

Housing of the sorter arranged screen basket associated wireless identification unit (14) and an external, especially mobile reading unit (16) for contactless reading of the screen basket (12) relevant technical data (18) from the identification unit (14) and for establishing a connection with another the sorter-related data-containing external database (20).

Theorem 2. System according to sentence 1, characterized in that the

Reading unit (16) comprises a display for reproducing further data related to the sorter retrieved from the external database.

The third system according to sentence 1 or 2, characterized in that the

Identification unit (14) comprises at least one RFID chip. The fourth system according to sentence 3, characterized in that the

Identification unit (14) comprises at least one of the screen basket (12) of the sorter associated RFID chip. The fifth system according to sentence 4, characterized in that the

Identification unit (14) comprises both the screen basket (12) of the sorter associated RFID chip and the housing (24) of the sorter associated RFID chip, wherein the screen basket (12) associated with RFID chip via a software coupling the RFID chip associated with the housing (24) can be coupled and the RFID chip assigned to the housing can be read out via the reading unit (16).

Set 6. System according to sentence 4, characterized in that directly to the sieve basket (12) of the sorter associated RFID chip via the reading unit (16) is read out.

Set 7. System according to at least one of the preceding sentences, characterized in that the screen basket (12) of the sorter associated RFID chip is arranged in the region of the closable via a lid opening of the sorter.

Set 8. System according to at least one of the preceding sentences, characterized in that the screen basket (12) of the sorter associated RFID chip on or in an end ring (22) of the screen basket (12) is arranged.

Set 9. System according to at least one of the preceding sentences, characterized in that the screen basket (12) of the sorter associated RFID chip on or in one of the closable by a lid opening of the sorter end ring (22) of the screen basket (12) is.

Theorem 10. System according to sentence 9, characterized in that the

Screen basket (12) of the sorter associated RFID chip on the opening of the sorter facing top of the end ring (22) is arranged. Sentence 1 1. System according to sentence 9, characterized in that the

Screen basket (12) of the sorter associated RFID chip on the radially inner side of the end ring (22) is arranged.

Theorem 12. System according to sentence 9, characterized in that the

Sieve basket (12) of the sorter associated RFID chip sunk in the end ring (22) is housed.

13. System according to sentence 12, characterized in that the sunk in the end ring of the strainer basket (12) accommodated RFID chip with a particular plastic and preferably made of Teflon cover or encapsulation is provided.

14. System according to at least one of the preceding sentences, characterized in that the further data relating to the sorter together with the technical data (18) characterizing the screen basket (12) are stored in the external database (20).

15. System according to at least one of the preceding sentences, characterized in that via the reading unit (16) retrievable from the external database (20) further data related to the sorter manufacturing data of Siebkorbs (12), CV data of Siebkorbs (12), operating data of the sorter and / or the like.

A system according to at least one of the preceding sentences, characterized in that it comprises data processing means for determining the energy balance between the previous sieve baskets, the total throughput rate previously handled by the screen basket (12), the speed of rotation of the screen basket (12) To determine the degree of wear of the screen basket (12) and thus the next change date for the screen basket (12) to the input and outputs of the sorter and / or the like. Although the method according to the invention can be used particularly advantageously in the cases described above, ie for monitoring a sealing device and / or for monitoring a sorter, it is not limited to these applications.

In the following, the invention will be explained with reference to schematic, not to scale figures further.

FIG. 1 shows schematically the essential components of the method according to the invention.

Figure 2 shows schematically a section of a sealing strip in a device according to the invention.

Figures 3 and 4 show in a purely schematic representation of an exemplary embodiment of a system for monitoring the state of a screen basket according to the further inventive idea

Figure 1 shows schematically a sealing strip 1, which is in frictional contact with a moving surface 200. This sealing strip 1 can be used in a suction roll, and seal a suction or blowing zone against the environment. However, it can also be in contact with a covering, in particular a sieve or a press felt, in order, for example, to seal a suction box. The sealing strip 1 in Figure 1 comprises a wear sensor 2. This sensor 2 generates a signal as soon as a specified level of wear of the sealing strip 1 is reached. FIG. 1 shows a sealing strip 1 with a sensor 2, but sealing strips 1 frequently comprise a plurality of wear sensors, preferably two or three. This makes it possible to set several levels of wear, upon reaching the sealing strip 1 sends a signal. Advantageously, one of the levels of wear can be set between 80% and 50% residual wear. The exact knowledge of the achievement of a comparatively early level of wear makes it possible to determine very early a first prediction of the remaining operating time of the sealing element 1. It may also be advantageous if one of the wear levels between 20% and 10% residual wear, preferably between 20% and 15% residual wear is set. The exact knowledge of the achievement of a comparatively late wear level allows a more accurate prediction of the remaining operating time of the sealing element 1. However, the sensors 2 can also be positioned so that they give a signal at other than the abovementioned wear levels, in particular between 50% and 20% residual wear. However, it is important for the method to know at which level of wear the respective sensor 2 sends a signal. This is determined prior to installation, and the sensors are positioned accordingly.

Via a signal line 5, the sensor signal is transmitted to a computer system. The transmission can be wired or wireless, such as via WLAN, Bluetooth or similar suitable signal lines 5 done. In the example shown in FIG. 1, one or more further characteristics are also transmitted to the computer system 3. These characteristics are transmitted here by the control system 6 of the machine and can indicate operating conditions of the machine such as e.g. Machine speeds, operating times of the machine, the downtime times of the machine, the type and / or quantity of the products produced, or the contact pressure of the sealing element to the moving surface, describe. These parameters can be transmitted continuously to the computer system 3, or at certain discrete times.

The computer system 3 calculates, based on the time zO at which the sealing strip 1 has been installed, and the time z1, at which a certain level of wear has been achieved, together with the other parameters from the control system 6, a prediction for the remaining operating time of the sealing strip 1 . The time z1 is transmitted here by a signal from the sensor 2 in the sealing strip 1. If more than one sensor 2 is installed, signals z2, z3, z4 .... may be transmitted to the computer system 3 at additional times, whereby the prediction can be improved by recalculation. The sensors typically provide a signal to the computer system 3 only at the discrete times z1, z2, z3, z4, .... In the intervals between them, the computer system continuously updates the remaining time remaining using the metrics from the control system and the current time.

The computer system 3 usually has a display device 4, on which the remaining operating time can be displayed.

Figure 1 shows the computer system 3 and the control system 6 as spatially separated objects, which are connected to each other by means of a wired or wireless signal line 5a. However, it is also possible that the two computer systems are realized in one unit. In this case, the calculation of the prediction of the remaining operating time can be carried out on a computing unit of the control system 6. The display of the remaining operating time can then take place, for example, on one or more monitors in a control room of the machine.

In the system shown in FIG. 1, moreover, the computer system 3 is connected to a further computer system 7 via a signal line 5b. This can be an electronic procurement system 7. If the remaining operating time of the sealing strip 1 reaches a predetermined threshold value, then a signal can then be sent to the procurement system 7 in order to initiate a timely purchase of a new sealing strip 1 or the like. Alternatively or additionally, when another or the same threshold value is reached, a signal can also be sent to another computer system 7 which plans or manages the planning of the maintenance work on the machine.

Figure 2 shows a section of a sealing strip 1 for a device according to the invention. The sealing strip 1 has a certain maximum wear volume 30 in the direction of wear V. If this volume 30 is removed by the frictional contact of the sealing strip 1 with the moving surface 200 or by other effects, the sealing strip 1 can no longer fulfill its function and it can even damage the moving surface 200, for example the suction roll shell or the clothing come. The remaining operating time of the sealing strip 1 is thus the time until the maximum wear volume is completely removed at least at one point over the length L of the sealing strip 1. In the case of the sealing strip shown in FIG. 2, three wear sensors 2 a, 2 b, 2 c are provided. They can each be designed as a hose which is filled with a medium, for example air or water. However, other types of wear sensors 2a, 2b, 2c are conceivable, such as optical sensors (optical waveguides) or electrical conductors. By way of example, the first sensor 2a can be positioned so that it gives a signal as soon as only a level of wear between 80% and 50% of the maximum wear volume 30 is available. By way of example, the third sensor 2c can be positioned such that it gives a signal as soon as only a wear level between 20% and 10% of the maximum wear volume 30 is available. The second sensor 2b can be positioned between the other two and, for example, give a signal as soon as only a level of wear between 40% and 30% of the maximum wear volume 30 is available. These values are to be understood as examples, and can also be significantly different depending on the situation and installation position.

It is advantageous that the last sensor 2 c is positioned so that at the time of the sensor signal, or when the corresponding wear levels sufficient operating time of the sealing element 1 remains sufficient time for a planned and controlled maintenance or replacement of the sealing element - Preferably in the context of a routine standstill of the machine - remains.

In the drawing, Figure 3 shows a purely schematic representation of an exemplary embodiment of a system 10 for monitoring the state of a screen basket 12 of a sorter for treating a pulp suspension according to the further inventive idea. The system 10 according to FIG. 4 comprises a wireless identification unit 14 assigned to the screen basket 12 arranged in a housing 24 of the sorter and an external, in particular mobile reading unit 16 for contactless reading of technical data 18 relating to the screen basket 12 from the identification unit 14 and for establishing a connection with an external database 20 containing the sorter data.

The reading unit 16 may include a display for displaying further data related to the sorter retrieved from the external database.

The identification unit 14 may comprise at least one RFID chip. In this case, it comprises at least one RFID chip associated with the screen basket 12 of the sorter. According to an exemplary embodiment of the system according to the further inventive idea, the identification unit 14 may comprise both an RFID chip assigned to the screen basket 12 of the sorter and an RFID chip assigned to the housing 24 of the sorter, wherein the RFID chip assigned to the screen basket 12 a software coupling can be coupled to the RFID chip assigned to the housing 24 and the RFID chip assigned to the housing 24 can be read out via the reading unit 16.

According to an alternative exemplary embodiment of the system 10, the RFID chip assigned to the screen basket 12 of the sorter can also be read out via the reading unit 16 directly.

In particular, in the case where the RFID chip assigned to the screen basket 12 of the sorter can be read out directly via the reading unit 16, the RFID chip assigned to the screen basket 12 of the sorter is expediently arranged in the region of the opening of the sorter which can be closed by a cover. In this case, the RFID chip associated with the screen basket 12 of the sorter can be arranged, in particular, on or in one of the end openings 22 of the screen basket 12 which can be closed by an opening of the sorter which can be closed by a lid. In the present case, the RFID basket associated with the screen basket 12 of the sorter is correspondingly arranged on or in the upper end ring 22 of the screen basket 12.

In this case, the RFID chip associated with the screen basket 12 of the sorter can be arranged, for example, on the upper side of the end ring 22 facing the opening of the sorter or else on the radial inner side of the end ring 22.

However, it is also conceivable, for example, such a design, in which the screen basket 12 of the sorter associated RFID chip sunk in the end ring 22 is housed. In this case, the sunk in the end ring 22 of the screen basket 12 accommodated RFID chip may be provided with a particular plastic and preferably made of Teflon cover. With such a cover, the fact is taken into account that the strainer basket 12 is usually reprocessed, i. chromed and electropolished. The other data relating to the sorter can be stored in the external database 20 together with the technical data relating to the screen basket 12. By means of the technical data 18 read out by the identification unit 14 of a respective screen basket 12, the relevant further data contained in the external database 20 can thus be assigned to the screen basket 12.

The further data relating to the sorter via the reading unit 16 from the external database 20 may in particular comprise production data of the screen basket 12, cv data of the screen basket 12, operating data of the sorter and / or the like. Here, the manufacturing data of the screen basket 12 include, for example, the construction, the material, the size or the like of the screen basket 12 relating data. The cv data of the screen basket 12 may include, for example, data for reprocessing the screen basket 12, storage times, etc. include. The operation data of the sorter include, for example, data regarding the running time, the flow / pressure at the inlet / outlet of the sorter, data relating to the rotational speed of the screen basket 12 and / or the like. The relevant information can be supplied in particular by the machine control of the sorter.

Such a system can also be monitored by means of the method according to the invention. As a result, a prediction of the remaining operating time of the wear element 12, that is, the screen basket 12 is delivered. This information can be used, for example, to optimize standstill planning.

In addition, according to the further inventive idea, the system 10 may comprise, for example, data processing means integrated in the reader 16 and / or in the external database 20, in order to calculate the total, based on the lifetime of previous screen baskets

previously handled by the screen basket 12 throughput, the rotational speed of the screen basket 12, the energy balance between the input and the outputs of the sorter and / or the like to determine the degree of wear of the screen basket 12 and thus the next change date for the screen basket 12.

Claims

claims

1 . A method for monitoring a wear device in a machine for producing or processing a fibrous web, wherein the wear device comprises at least one wear element (1), which is exposed to wear in particular by frictional contact, and the method comprises the steps of: a) providing the time zO, on the wear element (1) went into operation

b) providing the time z1, at which a predetermined first wear level of the wear element (1) has been achieved, characterized in that the method further comprises the steps of: c) providing at least one further characteristic K1 d) prediction of a remaining operating time of the wear element (1) from the knowledge of the times zO and z1 in particular from the difference time between zO and z1 and the at least one further characteristic K1 by means of a computer system (3). 2. A method for monitoring a sealing device for sealing at least one of a moving in a direction of movement surface (200) adjacent under or overpressure zone in a machine for producing or processing a fibrous web, wherein the sealing means comprises at least one sealing element (1), which in frictional contact is exposed to the moving surface (200) and is thus subject to wear, and the method comprises the steps of: a) providing the time zO at which the sealing element (1) went into operation b) providing the time z1 at which a fixed First level of wear of the sealing element (1) was achieved, characterized in that the method further comprises the steps of: c) providing at least one further characteristic K1 d) prediction of a remaining operating time of the sealing element (1) from the Knowledge of the times zO and z1 in particular from the difference time between zO and z1 and the at least one further characteristic K1 by means of a computer system (3).

A method according to claim 1 or 2, characterized in that in addition to the characteristic K1 additional, additional characteristics K2, K3, K4 ... are provided and these parameters are included in the prediction of the remaining operating time.

Method according to one of claims 1 to 3, characterized in that the further characteristic K1 and / or one or more of the additional additional characteristics K2, K3, K4 ... describe one or more aspects of the operation of the machine, in particular the operation of the machine since the time when the wear element (1) or the sealing element (1) went into operation.

Method according to one of the preceding claims, characterized in that the further characteristic K1 and / or one or more of the additional further characteristics K2, K3, K4 ... the machine speed, the operating times of the machine, the standstill times of the machine, the type and / or quantity of the products produced, or the contact pressure of the sealing element (1) on the moving surface (200) describe.

Method according to one of the preceding claims, characterized in that after the time z1 at least one further time z2, preferably a plurality of further times z3, z4, ... are provided, at which a fixed second, third, fourth, ... reaches wear level was, in each case in the provision of a new time, the remaining operating time can be redetermined taking into account all already provided times as well as the further characteristic or the other parameters.

7. The method according to any one of the preceding claims, characterized in that the provision of at least one of the times z1, z2, z3, z4 ..., preferably all points in time, which are included in the prediction of the remaining operating time, each carried out by a signal which from a sensor (2, 2a, 2b, 2c) in the sealing element (1) is transmitted directly or indirectly to the computer system (3).

8. The method according to any one of the preceding claims, characterized in that at least one of the further characteristic K1, K2, K3, K4 ..., preferably more of the further characteristic K1, K2, K3, K4 ..., by a control system (6 ), which also serves to monitor, control and / or regulate the machine.

9. The method according to any one of the preceding claims, characterized in that one of the wear levels between 80% and 50% residual wear is determined and / or one of the wear levels between 20% and 10% residual wear, preferably between 20% and 15% residual wear is set.

10. The method according to any one of the preceding claims, characterized in that the method additionally comprises the steps

d) Determining at least one threshold value for the remaining operating time e) Checking whether the remaining operating time falls below the at least one specified threshold value f) generating a warning signal if the remaining operating time falls below the at least one defined threshold value.

1 1. A method according to claim 10, characterized in that the indication signal is displayed on an optical or acoustic display device (4) and / or that the indication signal is forwarded to another computer system (7).

12. The method according to any one of the preceding claims, characterized in that the prediction of a remaining operating time of the wear element (1) or of the sealing element (1) takes place in the form of a single value and / or in the form of an interval.

13. A device for monitoring a sealing device for sealing at least one of a moving in a direction of movement surface (200) adjacent under or overpressure zone in a machine for producing or processing a fibrous web comprising at least one sealing element (1) with at least one, preferably a plurality of wear sensors (2,2a, 2b, 2c), a computer system (3) and means of signal transmission (5) from the at least one wear sensor to the computer system (3), characterized in that by means of the computer system (3) a prediction of the remaining operating time of Sealing element (1) by means of a method according to any one of claims 1 -12.

14. The apparatus according to claim 13, characterized in that the

Sealing element (1) comprises at least one wear sensor (2,2a, 2b, 2c) indicating a level of wear between 80% and 50% residual wear and / or a wear sensor of a wear levels between 20% and 10% residual wear. displays.

15. Device according to one of claims 13 to 15, characterized in that the at least one wear sensor (2,2a, 2b, 2c) at least one optical waveguide, an electrical conductor, a temperature sensor or a tube which is filled with a medium comprises , And wherein the optical waveguide, electrical conductors, the temperature sensor or the hose with progressive wear of the sealing element (1) is destroyed.