DE102020213494A1 - Maintenance device for the automated cleaning and maintenance of roll stands or parts thereof, and methods for the automatic cleaning of roll stands using the maintenance device and further use of the maintenance device - Google Patents

Abstract

The invention relates to a maintenance device (9) for the automated cleaning and maintenance of roll stands (1) or parts thereof, in particular for cleaning and maintenance of roll stands (1) or parts thereof in cold rolling mills, comprising at least one movable and/or displaceable underframe (10) , at least one articulated-arm robot (11) arranged on the base (10) and at least one maintenance head (13) attached to the articulated-arm robot (11) and connected to an articulated arm (12), the means for cleaning and/or sensory detection of maintenance, wear and soiling conditions within the roll stand (1), the subframe (10) having means for guiding on rails, in particular on back-up roll changing rails of the roll stand (1). The invention further relates to a method for the automated cleaning and maintenance of roll stands (1) using the maintenance device (9) according to the invention.

Description

The invention relates to a maintenance device for the automated cleaning and maintenance of roll stands, in particular for the cleaning and maintenance of roll stands in cold rolling mills. The invention also relates to a method for automatically cleaning roll stands, in particular for cleaning and maintaining roll stands in cold rolling mills, using the maintenance device.

In roll stands of rolling mills, metal strips are fed under pressure between two work rolls in order to reduce their material thickness or to influence other material properties. The work rolls are supported against their deformation on back-up rolls/or intermediate rolls. The rolls are vertically adjustable in roll stands. The roll stands include so-called roll stands. The rolls are mounted in their chocks in windows of the roll stands and are guided vertically movably along guide plates, in particular guide and wear plates fastened to the roll stands. These are held horizontally and axially by means of locks.

When forming the metal strips, heat is generated that has to be dissipated. In order to be able to dissipate the heat in a targeted manner, the rollers are cooled with a coolant/lubricant, e.g. an oil-water emulsion. The coolant/lubricant is sprayed onto the surface of the metal strip and/or onto the rolls via nozzle bars provided with a large number of nozzles. So-called multi-zone cooling is known in the prior art, which allows individual nozzles or groups of nozzles to be switched on and off in order to partially change the flatness of the rolling stock by partially influencing the temperature on the rolls.

The rollers are subject to wear, so they have to be changed regularly. It may be necessary to change the work rolls several times a day. A change of the back-up rolls or any existing intermediate rolls is due at longer intervals. From the EP 3 590 616 A1 a device and a method for changing back-up rolls on a roll stand are known. In the process, after the work rolls have been extended, a roll-changing chair is moved into the roll stand transversely to the rolling direction, with the roll-changing chair being able to be supported with a lower part on chocks of the lower back-up rolls and the upper back-up roll being lowered onto the roll-changing chair. The working rolls and the back-up rolls are pulled out and retracted via displacement devices which are designed as hydraulic piston-cylinder assemblies and are guided on rails.

The opportunity to change the backup rolls is mostly used to carry out other maintenance and cleaning work on the roll stand. Normal maintenance work on roll stands begins with the erection of a maintenance stand within the stand area free of the rolls in order to enable the employees to access them safely. After that, an employee will go into the roll stands with a high-pressure water device to remove dirt adhering to the surfaces, so that an inspection and an assessment of the maintenance status of the roll stand is possible. After cleaning, the frameworks are visually inspected.

The inspection usually also includes a functional test of nozzles for supplying the coolant/lubricant and a measurement of wear plates in which the roll chocks are moved vertically. Such cleaning, inspection and, if necessary, carrying out further maintenance work must be carried out in a cramped and relatively dark environment under difficult conditions. This work is mostly carried out on slippery surfaces in the presence of spilled oils or greases in poor lighting conditions. The time required for this is considerable.

During manual inspection, there is always a risk of falling into the scaffolding tub, but special attention must also be paid to securing against components arranged in the upper area of the stand. The time required for the safety activities also extends the system downtime.

In the prior art, it is known in principle to use industrial robots in various industrial production areas or manufacturing areas. These are used in particular in hazardous areas characterized by heat and dust.

From the WO 2010/088935 A1 the use of an industrial robot in a continuous casting plant is known. The publication describes an industrial robot with at least one assigned device that detects and/or detects the working area of the industrial robot, the industrial robot being characterized in that at least one working robot with a first manipulation arm or manipulator and at least one rigidly coupled thereto and having the detecting device Assistance robot and / or second manipulation arm is provided.

The object of the present invention is to provide a maintenance device for the automated maintenance and cleaning of roll stands in order to improve safety for the operating personnel by automating manual processes. The invention is also based on the object of providing a method for the automatic cleaning and/or maintenance of roll stands, in particular for the cleaning and/or maintenance of roll stands in cold rolling mills.

The object is achieved by the features of claims 1, 8 and 19. Advantageous refinements of the invention result from the dependent claims.

A first aspect of the invention relates to a maintenance device for the automated cleaning and maintenance of roll stands or parts thereof, in particular for the cleaning and maintenance of roll stands or parts thereof in cold rolling mills, comprising at least one mobile and/or displaceable underframe, at least one articulated arm arranged on the underframe Robot and at least one maintenance head attached to the articulated arm robot and connected to the articulated arm, which has means for cleaning and/or for sensory detection of maintenance, wear and soiling conditions within the roll stand, the underframe having means for guiding on rails, in particular for guiding on back-up roll changing rails of the roll stand. The automation that can be achieved with the maintenance device can in particular reduce the duration of maintenance states.

The device is equally suitable for use in hot and cold rolling mills, but is preferably used for cold rolling mills due to the greater cleanliness requirements for cold rolling.

Such a maintenance device can be moved into the roll stand by means of shifting devices present on the roll stands and the support roll change rails present there instead of the work rolls and support rolls that are otherwise installed. After reaching an operating position in the rolling stand, existing rolling mill gates can be closed in order to create a protected space in which no personnel are present or into which no personnel can enter. Within this space, the maintenance device or the maintenance head attached to the articulated-arm robot can either be controlled remotely or execute an automatically pre-programmed movement pattern. The articulated-arm robot can, for example, follow a predefined movement pattern for a cleaning process using high-pressure water or a steam jet.

The use of the maintenance device according to the invention is associated with a large number of advantages. Efficient and rapid cleaning of the roll stands can be carried out without personnel having to repeatedly enter and leave the hazardous area of the roll stand. In addition, there is no need for the staff to set up a maintenance platform inside the stand. In addition, a simple inspection and logging of the wear of certain parts of the roll stand is possible. For example, early detection of wear on the nozzles or wear plates is possible. The nozzles only have to be changed if concrete measurement results prove this.

The position of the maintenance device within the roll stand can be fixed or locked. The fixation can be done by clamping a traversing device for the support rollers. Locking can take place by locking the back-up roll chocks. An operating position of the maintenance device is thus secured and defined with regard to the method.

The maintenance device according to the invention can have means for providing and/or conveying cleaning media to the maintenance head. This can also include at least one electrical controller and at least one tank for storing a cleaning agent.

The articulated-arm robot is preferably arranged so that it can be moved on the base frame.

The articulated arm robot is expediently designed in such a way that it has degrees of freedom in at least six axes. Both pivoting degrees of freedom and rotational degrees of freedom are provided as degrees of freedom. The degrees of freedom preferably allow for free orbital movement of the service head located at the distal end of the articulating arm.

The means for cleaning and/or for detecting maintenance, wear and soiling conditions are preferably selected from a group comprising one or more cleaning nozzles, at least one edge finder, at least one laser sensor, at least one ultrasonic sensor, at least one optical sensor, at least one camera and at least one pressure measuring device for detecting the pressure and the spray angle of a coolant and/or lubricant.

It is also expedient if the maintenance device has at least one accessible platform for bridging a maintenance pit in front of the roll stand. The stage expediently extends transversely to the longitudinal extension of the underframe. The platform connects the service facility to an area outside the roll stand and at least partially bridges the roll change pit. A connection to the operator-side factory floor is created. This arrangement makes the stage the preferred area for arranging connections for media, such as high-pressure water or electricity, but also for arranging pumping devices and/or storage devices for media. The media ports can be set up for manual or automatic connection.

In an advantageous variant of the maintenance device according to the invention, it is provided that at least one pressure measuring sensor is provided as a pressure measuring device for detecting the state of wear of nozzles for providing a coolant and/or lubricant to the rolls of the roll stand, preferably as a pressure measuring plate, which is used to carry out a pressure distribution measurement is trained. The pressure measuring plate can be designed, for example, as part of the maintenance head and can be brought with the articulated arm to carry out a nozzle test in front of a nozzle bar arranged inside the roll stand with a large number of nozzles for the coolant and/or lubricant. The test can be carried out, for example, after a cleaning process. With the pressure measuring plate, the spray angle, the spray pattern and the spray pressure of one or more nozzles can be determined simultaneously.

An advantageous embodiment of the maintenance device comprises at least one pump unit and/or at least one storage unit for high-pressure water and/or a cleaning agent, which is provided on the underframe of the maintenance device.

The device according to the invention can be designed to be configurable for different roll stands. As a result, the device can be used for several roll stands within a plant. The adaptability can be ensured, for example, by means of adapter plates, so that the maintenance device can be adapted to the geometric framework of different scaffolding.

A further aspect of the invention relates to a method for the automatic cleaning and/or maintenance of roll stands, which is carried out using the maintenance device of the type described above.

1. a) Vorbereiten des Walzgerüsts für eine Wartung,
2. b) Positionieren der Wartungseinrichtung mit dem Untergestell auf den Stützwalzen-Wechselschienen des Walzgerüsts,
3. c) Einschieben der Wartungseinrichtung in das Walzgerüst unter Verwendung wenigstens einer Verschiebeeinrichtung für die Stützwalzen,
4. d) Ausführen eines Reinigungsprogramms, nach welchem der Wartungskopf mit dem Gelenkarm-Roboter nach einem vorgegebenen Bewegungsmuster wenigstens ein Reinigungsmedium auf die zu reinigenden Flächen des Walzgerüsts aufbringt und/oder
5. e) Ausführen eines Messprogramms zur Erkennung von Wartungs-, Verschleiß- und Verschmutzungszuständen des Walzgerüsts und gegebenenfalls Wiederholen des Verfahrensschritts d) und
6. f) Herausfahren der Wartungseinrichtung aus dem Walzgerüst sowie Einbauen der Stützwalzen und der Arbeitswalzen, sowie Vorbereiten des Walzgerüsts für einen Betrieb.

The method preferably comprises the following method steps:

1. a) preparing the roll stand for maintenance,
2. b) Positioning of the maintenance device with the subframe on the back-up roll changing rails of the roll stand,
3. c) pushing the maintenance device into the roll stand using at least one displacement device for the back-up rolls,
4. d) Executing a cleaning program, according to which the maintenance head with the articulated arm robot applies at least one cleaning medium to the surfaces of the roll stand to be cleaned according to a predetermined movement pattern and/or
5. e) running a measurement program to identify maintenance, wear and contamination states of the roll stand and, if necessary, repeating method step d) and
6. f) moving out the maintenance device from the roll stand and installing the back-up rolls and the work rolls, and preparing the roll stand for operation.

These method steps are preferably carried out in the order in which they are listed.

The preparation for the maintenance includes the dismantling of all rolls and the removal of the rolls from the area of the stand as well as further conversion measures if necessary. These other conversion measures include, for example, moving and swiveling control tables, closing drain accesses to collection containers and media deflection. Interfaces to a machine control can be provided for this.

When the maintenance device according to the invention has assumed its operating position within the roll stand, a self-calibration of the maintenance device can be provided. Such a self-calibration can, for example, take place automatically with the aid of optical or tactile sensors. The self-calibration can take place, for example, after method step c) and before method step d). For this purpose, at least one reference mark or at least one reference point with a specific and known position can be provided within the roll stand, by which the articulated-arm robot or its sensor system can be oriented.

The operating position of the subframe within the roll stand can be detected, for example, via end stops and/or limit switches.

Process steps d) and e) can be carried out cumulatively or alternatively.

In a variant of the method according to the invention, it can be provided that the cleaning program comprises several cleaning stages, wherein in at least a first cleaning stage a high-pressure cleaning, preferably with water, is carried out and preferably in a second cleaning stage provided as an action stage at least one chemical cleaning agent is applied to the cleaning surfaces is applied. After a certain exposure time, the first cleaning step can be repeated. Several cleaning cycles can also be carried out in one cleaning stage.

The implementation of an automatic cleaning program prevents the unwanted splashing of sensitive sensors and their damage.

The measurement program preferably includes checking the spray angle and the spray pattern as well as the spray pressure of at least one nozzle for providing a coolant and/or lubricant to the rolls of the roll stand. This can be done, for example, using at least one pressure measuring plate of the type described above.

Within method steps d) and/or e), it may be necessary to move the articulated-arm robot on the subframe in order to cover all areas within the roll stand. This is preferably included in the control via automatic sequences.

Furthermore, the measurement program can include the measurement of the wear plates of the roll stand. The wear plates are arranged on the mutually facing sides of the stand window of the roll stand. The maintenance head can, for example, use the edge finder to scan the wear plates and determine their distance from a known center line of the roll stand. Alternatively or additionally, this can be done optically, for example by means of laser measurement.

In a preferred variant of the method according to the invention, it is provided that the roll stand is closed after method step c) and before the cleaning program is carried out, if the maintenance device is in an operating position.

Preferably, after the maintenance device has reached the operating position, at least one existing rolling mill gate is closed, so that the maintenance unit is located in a closed space within the rolling stand. After that, the self-calibration and, if necessary, the execution of a cleaning program can take place.

Closing the space in which the maintenance unit is located has the advantage that, for example, the rolling mill gate or gates can be cleaned from the inside. Closing the roller doors prevents cleaning media from spraying out and reduces the risk of slipping in front of the roll stand.

After all the necessary cleaning, inspection and maintenance processes have been carried out, it can be provided according to the invention that the maintenance unit runs a self-cleaning program.

Since the maintenance unit is only used at maintenance intervals, it can be put to another use when it cannot be used in the scaffolding. For example, it can be used in a roll workshop at a defined position for cleaning and/or measuring chocks.

• 1 eine perspektivische Darstellung eines für die Wartung vorbereiteten Walzgerüsts,
• 2 eine schematische Darstellung der Wartungseinrichtung gemäß der Erfindung,
• 3 eine perspektivische und schematische Darstellung der Wartungseinrichtung innerhalb des Walzgerüsts.
• 4 eine alternative Verwendung der Wartungseinrichtung.

The invention is explained below using an exemplary embodiment with reference to the accompanying drawings. Show it:

• 1 a perspective view of a roll stand prepared for maintenance,
• 2 a schematic representation of the maintenance device according to the invention,
• 3 a perspective and schematic representation of the maintenance facility within the roll stand.
• 4 an alternative use of the maintenance facility.

1 shows a perspective view of a roll stand 1 prepared for maintenance, from which the work rolls and the support rolls have been removed. Any planned facilities such as control desks and the like were removed. The roll stand 1 comprises, in a known manner, roll stands 5 which each form windows between which an installation space 18 for a maintenance device 9 according to the invention extends. The roll stand 1 is in the in 1 maintenance condition shown prepared to receive the maintenance device 9 can. On the representation of assemblies necessary for the function of the maintenance facility are omitted for the sake of simplicity.

The roll stand 1 has a pair of rails 2 in the lower area of the spaced-apart roll stands 5, which are provided both for bringing in and removing the support rolls, on which the maintenance device can also be brought into the stand area. The pair of rails 2 extends both inside and outside of the roller stand 5. On the outside of a roller stand 5 there are locking tabs 3 which can lock both the support rollers and the maintenance device 9 in the retracted state in the stand, thus preventing unintentional movement on the rails 2 prevent. The maintenance device can be fixed in an operating position within the installation space. A number of wear plates 4 are attached to the insides of stand beams 6 of the roll stands 5, which guide vertical movement of the rolls. Nozzle beams 7 are fastened between the roll stands 5, from which the rolls and/or the rolling stock can be subjected to a coolant and/or lubricant.

In the upper area of the front roller stand 5, a frame cladding in the form of a retracted roller door 8 is shown schematically.

The method according to the invention firstly comprises preparing the roll stand 1 for cleaning. The preparation includes the removal of work rolls, back-up rolls and any additional rolls provided from roll stand 1, so that a free space is created within roll stand 1, which is referred to as installation space 18 within the scope of the method according to the invention, within which cleaning, inspection and maintenance of the Rolling stand 1 is possible. Instead of an inspection of the roll stand 1 by an employee, according to the invention 2 shown maintenance device 9 retracted or pushed into the roll stand 1 .

The maintenance device 9 comprises a base 10, an articulated arm robot 11 which is arranged on the base 10 and has an articulated arm 12 and a maintenance head 13 which is arranged at the far end of the articulated arm 12.

The articulated arm robot 11 is arranged to be movable on the base 10 . For this purpose, the subframe has guide and drive means 15 . For example, the articulated arm robot 11 can be moved on the base frame 10 via a pinion/rack combination. The movability enables a large area of action with a compact design of the articulated arm robot 11 at the same time. The articulated arm 12 has a total of six degrees of freedom, which enable the maintenance head 13 to move freely in orbit. Within the scope of the invention, it is possible for the articulated arm 12 to have fewer than six degrees of freedom. The maintenance head 13 comprises at least one pressure measuring plate 14, at least one cleaning nozzle 19 for dispensing cleaning fluid and at least one edge sensor 16 for tactile detection of a position. A walk-on platform of the maintenance facility 9 is designated by reference number 20 . The platform 20 extends transversely to the longitudinal extension of the underframe 10 and in the operating position of the maintenance device 1 bridges a pit inside or in front of the roll stand 1. Below the platform 20, tanks 21 for storing cleaning agents can be attached. Connections 22 for media that can be supplied externally and/or electrical equipment can also be attached to the stage. The arrangement of tanks 21 and connections 22 in connection with the platform 20 enables an extremely compact design of the maintenance facility 9.

The base 10 of the maintenance device 9 is provided with guide means 17, which are connected to the 1 shown pair of rails 2 of the rolling mill are compatible. In the present exemplary embodiment, 17 sliding shoes are shown as guide means. Alternatively, wheels can also be provided. The guide means 17 interact with the pair of rails 2 in such a way that the maintenance device 9 can be brought into and taken out of the roll stand 1 . The drive for moving the subframe 10 in and out can be pushed into the roll stand 1 by means of a displacement device (not shown) for the support rolls on the pair of rails 2 . Alternatively, the maintenance device can have its own drive.

If the maintenance device 9 the in 3 has reached the operating position shown, a roll-up door 8 of the rolling mill 1 is closed, so that the maintenance device 9 is located within the rolling stand 1 in a closed space.

In the operating position, the maintenance device 9 first carries out a calibration process, which includes determining the position of the maintenance head 13 . This can be done, for example, by scanning a reference position within the roll stand 1 with the edge finder 16 or by means of a laser detector or additionally optically by means of a camera provided on the maintenance head 13 .

In a further method step, all components within the roll stand 1 are cleaned with high-pressure water according to a predetermined cleaning pattern. The cleaning process can be carried out in several cycles. In a second cleaning stage, a chemical cleaning agent is applied to the surfaces to be cleaned with the maintenance head 13 according to a predetermined movement pattern. After a certain exposure time, the chemical cleaning agent can be removed again in a further cleaning cycle with water or steam.

In a further method step, the maintenance facility 9 executes a measurement program. The measuring program can also include several cycles, stages or variants. As part of the measuring program, the articulated-arm robot 11 moves the pressure measuring plate 14 of the maintenance head 13 in front of individual nozzles 8 of the nozzle bars 7. A nozzle test is then carried out, with individual nozzles 8 or specific nozzle groups being actuated and the emulsion or cooling and/or cleaning fluid is sprayed onto the pressure measuring plate 14. The pressure measuring plate 14 records the pressure, the spray pattern and the spray angle of the emulsion. The data is logged or stored in a control device of the maintenance device 9 for specific nozzles 8 or groups of nozzles. A report is created by software in which the maintenance personnel is informed about the condition of each individual nozzle 8 . Changing the nozzles 8 or correcting the alignment of the nozzles 8 is only necessary for those nozzles 8 that do not apply the required spray pressure or whose spray pattern is not satisfactory.

A further variant or stage of the measuring program includes the measurement of the wear plates of the roll stand 1 interacting with the work roll chocks and the back-up roll chocks. The method includes detecting the distance between the surface of the wear plates and a known and determined center line of the roll stand 1. If this distance falls below a predetermined level, the wear plates must be replaced.

After the end of the cleaning program and the measurement program, the maintenance device 9 carries out a self-cleaning. After the self-cleaning has taken place, the roller door 8 is opened and the maintenance device 9 is moved out of the roll stand 1 . This is followed by a preparation of the roll stand for the rolling operation, in particular the running-in of the rolls.

Another use of the maintenance device 9 is in 4 shown. The maintenance facility is used in a delimited area 30 for cleaning and measuring roll chocks 31 . The demarcated area 30 may be part of a roll shop. Analogous to use in a roll stand 1, the subframe 10 is positioned in a defined working position 32 and connected to a media supply. In this working position 32, a calibration can take place and a previously programmed cleaning and/or measurement program can be processed. Cleaning agents that are used are discharged via drainage channels 34 . As a result of this further use, a single maintenance device 9 can perform a number of tasks in a rolling mill operation and can therefore be used efficiently and cost-effectively.

Reference List

1

mill stand

2

pair of rails

3

locking tabs

4

wear plates

5

roller stand

6

stand beam

7

nozzle bar

8th

rolling gate

9

maintenance facility

10

base

11

Articulated robot

12

articulated arm

13

maintenance head

14

pressure plate

15

guiding and driving means

16

edge finder

17

means of guidance

18

installation space

19

cleaning nozzle

20

stage

21

tanks

22

connections

30

demarcated area

31

roll chocks

32

working position

33

media supply

34

gutter

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• EP 3590616 A1 [0004]
• WO 2010/088935 A1 [0009]

Claims (20)

Maintenance device (9) for automated cleaning and maintenance of roll stands (1) or parts thereof, in particular for cleaning and maintenance of roll stands (1) or parts thereof in cold rolling mills, comprising at least one movable and/or displaceable underframe (10), at least one articulated arm robot (11) arranged on the base (10) and at least one maintenance head (13) attached to the articulated arm robot (11) and connected to an articulated arm (12), the means for cleaning and/or for sensory detection of maintenance - Has wear and contamination of parts of the roll stand (1), wherein the base (10) has means for guiding on rails, in particular on back-up roll changing rails of the roll stand (1). Maintenance device (9) after claim 1 furthermore comprising means for providing and/or conveying cleaning media to the maintenance head (13). Maintenance device (9) according to one of Claims 1 or 2 , characterized in that the articulated arm robot (11) can be moved on the underframe (10). Maintenance device (9) according to one of Claims 1 until 3 , characterized in that the articulated arm robot (11) has at least six degrees of freedom, which allow free orbital movement of the maintenance head (13). Maintenance device (9) according to one of Claims 1 until 4 , characterized in that the means for cleaning and/or for detecting maintenance, wear and soiling states are selected from a group comprising one or more cleaning nozzles (19), at least one edge sensor (16), at least one laser sensor, at least one ultrasonic sensor , at least one optical sensor, at least one camera and at least one pressure measuring device for detecting the pressure and the spray angle of a coolant and/or lubricant. Maintenance device (9) according to one of Claims 1 until 5 , characterized in that the maintenance device (9) has at least one accessible platform (20) for bridging a maintenance pit of the roll stand (1). Maintenance device (9) according to one of Claims 1 until 6 , characterized in that at least one pressure measuring sensor is provided as the pressure measuring device for detecting the state of wear of nozzles for providing a coolant and/or lubricant to the rolls of the roll stand (1), preferably as a pressure measuring plate (14), which is designed to carry out a pressure distribution measurement . Maintenance device (9) according to one of Claims 1 until 7 , characterized by at least one pump unit and/or at least one storage unit for high-pressure water and/or a cleaning agent, which is provided on the base of the maintenance facility. Method for the automatic cleaning and/or maintenance of roll stands or parts thereof, in particular for the cleaning and maintenance of roll stands or parts thereof in cold rolling mills, using the maintenance device (9) according to at least one of Claims 1 until 8th . procedure after claim 9 , comprising the following process steps: a) Preparing the roll stand for maintenance b) Positioning the maintenance device with the subframe on the back-up roll changing rails of the roll stand, c) Pushing the maintenance device into the roll stand using at least one displacement device for the back-up rolls, d) Carrying out a cleaning program, according to which the maintenance head with the articulated-arm robot applies at least one cleaning medium to the surfaces of the roll stand to be cleaned according to a predetermined movement pattern and/or e) execution of a measuring program to identify maintenance, wear and soiling states of the roll stand and, if necessary, repeating the Method steps d) and f) moving out the maintenance device from the roll stand and installing the back-up rolls and the work rolls and preparing the roll stand for operation. procedure after claim 10 , characterized in that the process steps a) to f) are carried out in the order in which they are listed. Procedure according to one of claims 9 until 11 , characterized in that the cleaning program comprises several cleaning stages, with a high-pressure cleaning being carried out in at least a first cleaning stage and at least one chemical cleaning agent being applied to the surfaces to be cleaned in a second cleaning stage provided as an action stage. Procedure according to one of claims 9 until 12 , characterized in that the measurement program includes checking the spray angle and the spray pattern as well as the spray pressure of at least one nozzle for providing a coolant and/or lubricant to the rolls of the roll stand. procedure after Claim 13 , characterized in that the verification of the spray angle and the spray pattern and the spray pressure using at least one pressure plate according to claim 6 is carried out. Procedure according to one of claims 9 until 14 , characterized in that the measurement program includes the measurement of wear plates of the roll stand. procedure after claim 15 , characterized in that the wear plates are measured optically by means of at least one laser and/or tactilely by means of at least one edge finder. procedure after claim 15 or 16 , characterized in that the thickness of the wear plates is determined in relation to the center of the roll stand. Procedure according to one of claims 9 until 17 , characterized in that the roll stand is closed after method step c) and before carrying out the cleaning program when the maintenance device is in an operating position. Procedure according to one of Claims 1 until 18 , characterized in that after method step f) a self-cleaning program is carried out. Use of a maintenance device according to one of Claims 1 until 9 for cleaning and measuring roll chocks (31) in a workshop area.

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