EP3782745A1 - Straightening machine, maintenance device and method for making straightening rolls accessible for the maintenance of a straightening machine - Google Patents

Abstract

The invention relates to a straightening machine for straightening a metal strip or flat metal parts, with a number of upper straightening rolls 5 in an upper roll frame 1 and a number of lower straightening rolls 6 in a lower roll frame 2. The upper and lower straightening rolls 5, 6 are arranged in this way that they form a straightening gap 3 between an inlet 8 and an outlet 9 of the straightening machine in a work area 4 in order to act from above and below on the metal strip or metal part to be straightened and this in a working direction 7 from the inlet 8 to the outlet 9 through the Furthermore, the straightening machine comprises a lower slide plate 15 with which the lower straightening rollers 6 on an operating side of the straightening machine can be extended and retracted transversely to the working direction 7 from the working area 4 of the straightening machine, with an interchangeable prism 22 for insertion into the Alignment gap 3 is provided, which is designed so that it is at e When the lower slide plate 15 is extended out of the work area 4, it can rest on the lower straightening rollers 6, while the upper straightening rollers 5 rest on the interchangeable prism 22.

Description

The invention relates to a straightening machine for straightening a metal strip or flat metal parts according to the preamble of claim 1, in particular a straightening machine with a maintenance device, and a method for making straightening rolls accessible for the maintenance of such a straightening machine. The invention also relates to a maintenance device for performing the method.

A straightening machine of the present type includes a number of upper straightening rolls, which are stored in an upper roll frame, and a number of lower straightening rolls, which are stored in a lower roll frame. The upper and lower straightening rollers are arranged in such a way that they form a straightening gap in a working area between an inlet and an outlet of the straightening machine, in order to act from above and below on the metal strip or metal part to be straightened and this through in a working direction from the inlet to the outlet to guide the straightener.

Straightening machines of the present type are used to remove tension and unevenness in metal strips or metal parts. For this purpose, the upper and lower straightening rollers are offset from one another along the straightening gap in such a way that the material to be straightened is bent alternately up and down on the straightening rollers. The bending takes place in such a way that the material is bent beyond its yield point, at least at the first straightening rollers, so that undesirable bends and stresses in the material are eliminated as completely as possible. Usually the material is attached to the first straightening roll of the straightening machine heavily plasticized. The material is bent a little less on each further straightening roller, and the material is no longer plasticized on the last straightening roller, ie it is only elastically deformed.

In the metal processing industry, metal strips are often used, which are delivered as so-called coils and processed from there for production. The winding of the strip material into coils and any previous thermal treatments and the like result in unevenness and tension in the strip material, which are unfavorable for further processing. Therefore, after being unwound from the coil, metal strips are passed through the straightening gap of a straightening machine of the present type, which they leave flat and free of tension. The same applies to flat metal parts that are to be freed from undesired bends and stresses.

In order to maintain a straightening machine, it is necessary from time to time to make the straightening rollers accessible from the outside, for example to inspect them, to free them from contamination or, if necessary, to replace them. Since the straightening rolls are not only stored in the upper and lower roll frame, but also have to be coupled to a drive device, and there are usually several pairs of supporting rolls for each straightening roll to absorb the forces acting on the straightening rolls during operation and to prevent the straightening rolls from bending To prevent it, it is very complex and time consuming to remove the upper and / or lower roller frame from the straightening machine and take it apart in order to make the straightening rollers accessible for the purpose of the upcoming maintenance work, which can also consist of a pure inspection. In addition, large straightening machines are equipped with straightening rollers, each of which can weigh several hundred kg and therefore cannot be handled without tools.

In order to be able to make the straightening rolls of a straightening machine of the present type accessible without having to remove the roll mills, it is for example from the EP 2 190 603 B1 known, the upper straightening rollers and the lower straightening rollers each together with their support rollers and support roller blocks to be attached to an upper or a lower slide plate, with which they can be extended transversely to the working direction from the working area of the straightening machine on an operating side of the straightening machine and retracted into this again. For this purpose, on a drive side of the straightening machine, opposite the operating side of the straightening machine, there are coupling elements for coupling and uncoupling drive shafts of the drive device to and from the straightening rollers. The straightening rollers of this known straightening machine are attached to the respective slide plate in an interchangeable cassette, which is provided with bearing strips on both the operating side and the drive side of the straightening machine, in which the straightening rollers are mounted and held.

This known concept of being able to move straightening rollers of a straightening machine of the present type by means of slide plates on the operating side of the straightening machine leads to a considerably simplified accessibility of the straightening rollers, since only the straightening gap is slightly open, safety devices of the slide plates or the roller frames are released and the respective slide plate is removed must be pulled out of the work area of the straightening machine to gain access to the straightening rolls. The slide plates thus act as a maintenance device for the straightening machine.

Especially in the case of straightening machines with straightening rollers, which can no longer be removed by hand from the interchangeable cassette or removed from the associated slide plate, since they have a corresponding weight, however, it has been found that the accessibility of the upper straightening rollers is an additional challenge. Because if the upper straightening rollers are moved out of the work area of the straightening machine together with the upper slide plate, the upper straightening rollers hang in their bearings below the upper slide plate and cannot be released from their bearings without additional security. The removal of the upper straightening rollers is also made more difficult because they cannot be easily attached to a crane because of the slide plate located above them, as is the case with the lower straightening rollers, which naturally lie above the lower slide plate.

The invention is therefore based on the object of proposing a straightening machine of the type mentioned, in which there is at least one lower slide plate for extending the lower straightening rolls, as well as a method for making straightening rolls accessible for the maintenance of a straightening machine, the proposed straightening machine or the Process ensures improved accessibility of the upper straightening rollers.

This object is achieved by a straightening machine having the features of claim 1 and by a method having the features of claim 12. Preferred embodiments of the straightening machine can be found in claims 2 to 8; Advantageous further developments of the method are set out in claims 13 to 15. A straightening machine with a maintenance device is defined in claim 9, while a maintenance device for carrying out the method according to the invention is found in claim 10, and a preferred development of the maintenance device is the subject matter of claim 11.

A straightening machine of the present invention thus comprises, as is initially known per se, a number of upper straightening rolls, which are mounted in an upper roll frame, a number of lower straightening rolls, which are mounted in a lower roll frame, the upper and lower straightening rolls so arranged are that they form a straightening gap between an inlet and an outlet of the straightening machine in a work area in order to act from above and below on the metal strip or metal part to be straightened and to guide it in one working direction from the inlet to the outlet through the straightener, and includes Furthermore, a lower slide plate with which the lower straightening rollers on an operating side of the straightening machine can be extended transversely to the working direction from the working area of the straightening machine and retracted again. An upper slide plate for the upper straightening rolls can be present; however, it can be dispensed with in many cases, since according to the inventive concept the upper straightening rollers can be moved out of the working area of the straightening machine together with the lower straightening rollers on the lower slide plate. For this purpose, according to the invention, an interchangeable prism is as Maintenance device or provided as an extension of the maintenance device, which can be inserted into the straightening gap (usually after it has been widened) and which is designed so that it then rests on the lower straightening rollers when the lower slide plate is extended from the work area, while the upper straightening rollers rest on the interchangeable prism.

The lower slide plate can therefore optionally, as known per se from the prior art, be extended with the lower straightening rollers from the working area of the straightening machine and retracted into it again, or according to the present invention, after inserting the interchangeable prism into the straightening gap the lower straightening rollers, with the interchangeable prism resting on them, and with the upper straightening rollers resting on the interchangeable prism, are extended out of the work area of the straightening machine and retracted again. With the second alternative of extending the lower slide plate, the upper straightening rollers are made accessible, advantageously in such a way that the upper straightening rollers, in the extended position of the lower slide plate, are accessible from above, in particular also for a crane. There is then not, as is the case in the prior art, an upper slide plate which would cover the upper straightening rollers and prevent direct access from above.

The method according to the invention for making straightening rolls accessible for the maintenance of a straightening machine, which is designed as just stated, accordingly comprises the lifting of the upper roller frame relative to the lower roller frame to widen the leveling gap (whereby according to the invention only the relative movement is important, i.e. it could also be the lower roller frame are lowered), the insertion of an interchangeable prism into the widened straightening gap, whereby the interchangeable prism is preferably placed directly, but optionally also indirectly, on the lower straightening rollers, the release of an upper bearing strip in which the upper straightening rollers are mounted from the upper roller frame and placing the upper straightening rollers on the interchangeable prism (this process step being reversed or carried out simultaneously can), loosening a lower bearing strip in which the lower straightening rollers are mounted and / or the lower slide plate from the lower roller frame and pulling out the lower slide plate together with the exchangeable prism resting on the lower straightening rollers and the upper straightening rollers resting on the exchangeable prism from the Work area of the straightener.

The straightening machine according to the invention preferably has, as is known per se, at least on the operating side of the straightening machine an upper bearing strip in which the upper straightening rollers are mounted and a lower bearing strip in which the lower straightening rollers are mounted. The upper and lower bearing guides are directly, or indirectly, releasably fastened in the respective roller frame by means of a fastening in a slide plate in order to move the lower straightening rollers, or according to the invention optionally the lower straightening rollers together with the upper straightening rollers, with the lower slide plate out of the work area of the straightener to be able to.

The lower slide plate of the straightening machine according to the invention can carry lower supporting roller blocks with supporting rollers mounted therein, on which the lower straightening rollers rest and from which the lower straightening rollers are supported during operation of the straightening machine. The lower bearing strip for the lower straightening rollers is then attached directly or indirectly to the lower slide plate, so that when the lower slide plate is pulled out, both the support roller blocks with the support rollers stored therein and the lower straightening rollers together with the lower slide plate extend out of the work area of the straightener and be retracted again. In the context of the present invention, at least one interchangeable cassette can also be provided, in which the lower straightening rollers in particular are seated and which can be extended and retracted with the lower slide plate.

Preferably there is a driver device for coupling the upper bearing strip to the lower bearing strip. This driver device can ensure that the upper bearing strip with the upper straightening rollers stored therein together with the lower bearing strip, the lower straightening rollers and the lower slide plate is extended from the work area of the straightener. This driver device can be attached to the lower bearing strip and / or to the interchangeable prism; the latter also to additionally couple the interchangeable prism to the lower and upper bearing strip. Swiveling clamping lugs attached to the driver device are preferably used to fasten the upper bearing strip.

A further preferred embodiment of the straightening machine according to the invention consists in the presence of a holding bar for attachment to the upper bearing bar, the holding bar being provided with a receptacle for the upper straightening rollers, in which the upper straightening rollers can be fixed at least in one axial degree of freedom. In order to facilitate re-engagement in coupling elements of a drive device when the upper straightening rolls are retracted, it is advantageous if the straightening rolls can rotate about their longitudinal axis despite their axial fixation in the holding bar. The retaining bar ensures that the upper straightening rollers are extended together with the upper bearing bar from the work area of the straightening machine and are not pulled out of the bearing bar, for example because they get stuck in the coupling element of the drive device on their opposite end face. In addition, the bearings of the upper straightening rollers in the upper bearing bar are relieved by the holding bar when extending, since the holding bar ensures a flow of force from the lower slide plate via the lower bearing bar, the driver device and the upper bearing bar into the upper straightening rolls when the lower slide plate is pulled out becomes.

The interchangeable prism present according to the invention preferably consists essentially of a frame with at least two roller support strips held in the frame and / or forming parts of the frame. In order to be able to insert the interchangeable prism by hand into the straightening gap and to be able to remove it from it, it is preferably made of aluminum or some other light metal.

If the retaining bar can be moved in an axial degree of freedom relative to the upper bearing bar to which it is attached, for example by means of forcing bolts, the retaining bar can also be used to push the upper straightening rollers out of the upper bearing bar and pull them back into it.

Figur 1

eine schematische Ansicht des Arbeitsbereichs einer erfindungsgemäß ausgestalteten Richtmaschine, von der Bedienseite;

Figur 2

eine Ansicht wie Figur 1 in einem anderen Verfahrensstadium;

Figur 3

eine isometrische Ansicht eines Beispiels für ein Wechselprisma;

Figur 4

eine Ansicht wie Figur 1, in einem weiteren Verfahrensstadium;

Figur 5

eine isometrische Ansicht eines Beispiels für eine Halteleiste;

Figur 6

eine Ansicht wie Figur 1 in einem weiteren Verfahrensstadium;

Figur 7

ein Ausschnitt aus einer Ansicht wie Figur 1 in einem weiteren Verfahrensstadium;

Figur 8

eine isometrische Ansicht eines Teils der Richtmaschine aus Figur 1, mit ausgefahrener Schieberplatte;

Figur 9

ein Detail aus Figur 8;

Figur 10

das Detail aus Figur 9 in einem späteren Verfahrensstadium und aus einem anderen Betrachtungswinkel;

Figur 11

das Detail aus Figur 9, in einem weiteren Verfahrensstadium;

Figur 12

das Detail aus Figur 9 in einem weiteren Verfahrensstadium;

Figur 13

das Detail aus Figur 9 in einem weiteren Verfahrensstadium.

An exemplary embodiment for a straightening machine designed according to the invention, on the basis of which an exemplary embodiment for a method according to the invention is also explained, is described below with reference to the accompanying drawings. Show it:

Figure 1

a schematic view of the work area of a straightening machine designed according to the invention, from the operating side;

Figure 2

a view like Figure 1 at another stage of the procedure;

Figure 3

an isometric view of an example of an interchangeable prism;

Figure 4

a view like Figure 1 , at a further stage of the procedure;

Figure 5

an isometric view of an example of a retaining bar;

Figure 6

a view like Figure 1 at a further stage of the procedure;

Figure 7

a section of a view like Figure 1 at a further stage of the procedure;

Figure 8

Figure 3 is an isometric view of part of the leveler Figure 1 , with extended slide plate;

Figure 9

a detail Figure 8 ;

Figure 10

the detail Figure 9 at a later stage of the proceedings and from a different angle;

Figure 11

the detail Figure 9 , at a further stage of the procedure;

Figure 12

the detail Figure 9 at a further stage of the procedure;

Figure 13

the detail Figure 9 at a further stage of the procedure.

Figure 1 shows, in a side view, a detail with the work area 4 of a straightening machine, which is exemplarily configured according to the present invention. The same view is found in the Figures 2 , 4th and 6th , in which the same reference symbols are used for the same elements.

The straightening machine shown in these figures has an upper roller frame 1 and a lower roller frame 2, which are held in a frame (not visible here), the upper roller frame 1 being able to move up and down to open and close a leveling gap 3 can. In the present exemplary embodiment, six upper straightening rollers 5 are arranged above the straightening gap 3 in the upper roller frame 1, while a total of seven lower straightening rollers 6 are present below the straightening gap 3 in the lower roller frame 2. Of the upper and lower straightening rollers 5, 6, essentially only their end faces, which point towards the operating side and are provided with axial coupling elements, can be seen in these illustrations.

The upper and lower straightening rollers 5, 6 are arranged offset from one another along the straightening gap 3, i.e. in a working direction 7 from an inlet 8 to an outlet 9 of the working area 4, in such a way that a metal strip (not shown), which is fed by the straightening rollers 5 , 6 is transported from the inlet 8 to the outlet 9, is bent alternately up and down on the upper and lower straightening rollers 5, 6 in order to eliminate tension and unevenness in the material.

In order to prevent the upper and lower straightening rollers 5, 6 from bending, they are each provided with upper support rollers 10 (only a small part of which can be seen) or lower support rollers 11 in the respective roller frame 1 acting in pairs on each straightening roller 5, 6 , 2 supported.

The support rollers 10, 11 are mounted in respective support roller blocks, the lower support roller blocks 14 being visible here only for the lower support rollers 11. These lower support roller blocks 14 sit on a lower slide plate 15, which can be pulled out of the working area 4 of the straightening machine transversely to the working direction 7, in the present figures to the front (see FIG. 8).

The upper straightening rollers 5 are supported, among other things, on the operating side of the straightening machine that is visible here in an upper bearing strip 12, while the lower straightening rollers 6 are supported here in a lower bearing strip 13.

In addition to the lower slide plate 15, the present straightening machine is also equipped with an upper slide plate 16 which, supported by two upper slide plate supports 17, can be pulled out of the work area 4 of the straightening machine. In a corresponding manner, the lower slide plate 15 is also supported by two lower slide plate supports 18 when it is pulled out of the working area 4 of the straightening machine. A releasable lock 19 each secures the lower and upper slide plates 15, 16 on the respective roller frame 1, 2 when the straightening machine is in operation.

A driver device 20 is attached to the lower bearing strip 13 at the inlet 8 and also at the outlet 9 and is equipped with pivotable clamping lugs 21 which are used to couple the upper bearing strip 12 to the lower bearing strip 13.

In Figure 3 an embodiment of an interchangeable prism 22 present or used according to the invention is shown. This is made of aluminum and consists essentially of a frame 23, which in turn is composed of two side profiles 24, 24 'and three connecting roller support strips 25, 25', 25 ". The roller support strips 25 are provided with notches 26 upwards and downwards to accommodate straightening rollers , which is why these notches 26 are offset from one another on the top and bottom. The lightweight construction of the example shown here for an interchangeable prism 22 enables this to be handled by hand and without further aids.

Figure 5 shows an embodiment for a holding bar 27, which is provided with receptacles 28 for the upper straightening rollers 5 (cf. Figure 6 ) is equipped and has two forcing bolts 29 and rotatable armature disks 31.

In the remaining figures, identical parts are each provided with identical reference numerals, so that reference can be made to the preceding description.

In order to inspect the upper straightening rollers 5 of the present exemplary embodiment of a straightening machine and, if necessary, to clean or replace them, according to the invention the upper slide plate 16 does not have to be pulled out of the working area 4 of the straightening machine, but the following example of a method according to the invention can be used:
Figure 1 shows the starting position, ie the straightening machine, the working area 4 of which is shown here in a view of the operating side, is in an operational state. After straightening material is moved out of straightening gap 3, if necessary, it is initially carried out, as in FIG Figure 2 shown, the upper roller frame is raised in order to widen the straightening gap 3. Then it will be in Figure 3 The illustrated exchangeable prism is manually inserted into the open straightening gap 3 and the upper roller frame 1 is lowered again until the upper straightening rollers 5 rest on the exchangeable prism 22, more precisely on its roller support strips 25 rest. At the same time, the interchangeable prism 22 rests on the lower straightening rollers 6. This situation shows Figure 4 .

In the Figure 5 shown holding bar 27 is how Figure 6 shows, with their receptacles 28 attached to the front ends of the upper straightening rollers 5 and the forcing bolts 29 of the retaining bar 27 are screwed into threaded bores 30 in the upper bearing bar 12 provided for this purpose. The forcing bolts 29 are held on the retaining strip 27 by means of rotatable armature disks 31. This connection can be released by rotating the armature disks 31.

Why then Figure 7 shows, the clamping lugs 21 of the driver device 20 are now pivoted and fastened to the upper bearing strip 12 in order to couple it to the lower bearing strip 13 on which the driver device 20 is attached. The lower and upper bearing bars 12, 13 are thus fixed to one another by the driver device 20, while the upper straightening rollers 5 by means of the retaining bar 27 and its forcing bolts 29 on the upper bearing bar 12 in any case with an axial degree of freedom (rotation of the upper straightening rollers 5 remains possible). is fixed.

Now the lower slide plate 15, as shown in Figure 8 is shown, supported by two lower slide plate supports 18, pulled out transversely to the working direction 7 from the working area 4 of the straightening machine. The lower slide plate 15 carries, like Figure 8 clearly shows the lower support roller blocks 14 with the lower support rollers 11 and the lower straightening rollers 6 resting thereon, the lower bearing strip 13 additionally being connected directly to the lower slide plate 15. When the lower slide plate 15 is pulled out, the lower straightening rollers 6 are thus moved out of the working area 4 of the straightening machine.

Due to the coupling of the upper bearing bar 12 with the lower bearing bar 13 via the driver device 20, as well as due to the axially form-fitting fixing of the upper straightening rollers 5 on the holding bar 27 and thus also on the upper bearing bar 12, and ultimately also because the upper Straightening rollers 5 rest on the interchangeable prism 22, which in turn rests on the lower straightening rollers 6, when the lower slide plate 15 is pulled out, the upper straightening rollers 5 are simultaneously extended from the working area 4 of the straightening machine and, if necessary, released from corresponding coupling elements on the drive side of the straightening machine .

How based on Figure 8 immediately illuminating, the upper straightening rollers 5 are directly accessible from above and can in particular be inspected without the upper slide plate 16 interfering with it. Removing individual upper straightening rolls 5 with the aid of a crane is also easily possible after performing the following process steps:
How Figure 9 shows, the forcing bolts 29 of the retaining bar 27 are screwed into the threaded bores 30, whereby the upper straightening rollers 5 are pushed axially rearward from the upper bearing bar 12 because of the axially form-fitting fixation of the upper straightening rollers 5 in the receptacles 28 of the holding bar 27. This situation shows Figure 10 .

The armature disks 31 are then rotated and the retaining strip 27 removed and the clamping lugs 21 of the driver device 20 released, after which the in Figure 11 the situation shown. The upper bearing strip 12 is now freely movable in the axial direction of the upper straightening rollers 5, so that it can be pulled out towards the front, cf. Figure 12 , and is finally removed, see FIG. 13. The upper straightening rollers 5 can now be freely removed individually from above and can in particular be lifted out by means of a crane in order to be able to replace them, for example.

In order to make the straightening machine ready for operation again, the process steps described simply have to be carried out in reverse order.

In order to make the lower straightening rollers 6 accessible, the upper straightening rollers 5 remain in the upper roller frame 1, and the lower slide plate 15 is pulled out of the working area 4 in the conventional manner.

Claims (15)

Straightening machine for straightening a metal strip or flat metal parts,
with a number of upper straightening rolls (5) in an upper roll frame (1) and a number of lower straightening rolls (6) in a lower roll frame (2),
wherein the upper and lower straightening rollers (5,6) are arranged in such a way that they form a straightening gap (3) between an inlet (8) and an outlet (9) of the straightening machine in a work area (4) to allow from above and below act on the metal strip or metal part to be straightened and guide it through the straightening machine in one working direction (7) from the inlet (8) to the outlet (9),
and with a lower slide plate (15), with which the lower straightening rollers (6) on an operating side of the straightening machine can be extended transversely to the working direction (7) from the working area (4) of the straightening machine and retracted again,
characterized,
that an interchangeable prism (22) is provided for insertion into the straightening gap (3), which is designed so that it can rest on the lower straightening rollers (6) when the lower slide plate (15) extends out of the work area (4) and at the same time the upper straightening rollers (5) can rest on the interchangeable prism (22). Straightening machine according to claim 1,
characterized,
that the upper straightening rollers (5) at least on the operating side of the straightening machine in an upper bearing strip (12) and the lower straightening rollers (6) at least on the operating side of the straightening machine in a lower bearing strip (13), the upper and lower bearing strips ( 12, 13) are releasably attached in the respective roller frame (1, 2). Straightening machine according to one of Claims 1 or 2,
characterized,
that on the lower slide plate (15) lower support roller blocks (14) with lower support rollers (11) mounted therein are attached, on which the lower straightening rollers (6) rest. Straightening machine according to one of claims 2 or 3,
characterized,
that the lower bearing strip (13) is attached directly or indirectly to the lower slide plate (15). Straightening machine according to one of Claims 2 to 4,
characterized,
that a driver device (20) for coupling the upper bearing strip (12) to the lower bearing strip (13) is present, the driver device (20) in particular on the lower bearing strip (13), on the lower slide plate (15) and / or on the Interchangeable prism (22) is attached. Straightening machine according to claim 5,
characterized,
that the driver device (20) has pivotable clamping lugs (21) for fastening to the upper bearing strip (12). Straightening machine according to at least one of claims 2 to 6,
characterized,
that a retaining bar (27) is provided for attachment to the upper bearing bar (12), wherein the retaining bar (27) is provided with receptacles (28) for the upper straightening rollers (5) to the upper straightening rollers (5) at least in an axial direction To fix degree of freedom. Straightening machine according to at least one of claims 1 to 7,
characterized,
that the interchangeable prism (22) essentially consists of a frame (23) with at least two roller support strips (25, 25 ', 25 ") held in the frame (23) and / or forming parts of the frame. Straightening machine with maintenance facility, comprising a straightening machine for straightening a metal strip or flat metal parts,
with a number of upper straightening rolls (5) in an upper roll frame (1) and a number of lower straightening rolls (6) in a lower roll frame (2),
wherein the upper and lower straightening rollers (5,6) are arranged in such a way that they form a straightening gap (3) between an inlet (8) and an outlet (9) of the straightening machine in a work area (4) to allow from above and below act on the metal strip or metal part to be straightened and guide it through the straightening machine in one working direction (7) from the inlet (8) to the outlet (9),
and with a lower slide plate (15), with which the lower straightening rollers (6) on an operating side of the straightening machine can be extended transversely to the working direction (7) from the working area (4) of the straightening machine and retracted again,
in particular according to at least one of claims 1 to 10,
characterized,
that an interchangeable prism (22) for insertion into the straightening gap (3) is provided as a maintenance device, which is designed in such a way that it can rest on the lower straightening rollers (6) when the lower slide plate (15) extends out of the work area (4) and at the same time the upper straightening rollers (5) can rest on the interchangeable prism (22). Maintenance device for a straightening machine with a number of upper straightening rolls (5) in an upper roll frame (1) and a number of lower straightening rolls (6) in a lower roll frame (2), the upper and lower straightening rolls (5,6) arranged in this way are that they form a straightening gap (3) between an inlet (8) and an outlet (9) of the straightening machine in a work area (4) in order to act from above and below on the metal strip or metal part to be straightened and in a working direction (7) from the inlet (8) to the outlet (9) through the straightening machine, and with a lower slide plate (15) with which the lower straightening rollers (6) on an operating side of the straightening machine transversely to the working direction (7) the working area (4) of the straightening machine can be extended and retracted again, in particular for a straightening machine according to at least one of claims 1 to 8,
characterized,
that the maintenance device essentially consists of an interchangeable prism (22) for insertion into the straightening gap (3), which is designed in such a way that when the lower slide plate (15) of the straightening machine is moved out of the work area (4), it moves onto the lower straightening rollers ( 6) can rest and at the same time the upper straightening rollers (5) can rest on the interchangeable prism (22). Maintenance device according to claim 10,
characterized,
that the interchangeable prism (22) consists essentially of a frame (23) with at least two roller support strips (25, 25 ', 25 ") held in the frame (23) and / or forming parts of the frame. Method for making straightening rolls accessible for the maintenance of a straightening machine with a number of upper straightening rolls (5) in an upper roll mill (1) and a number of lower straightening rolls (6) in a lower roll mill (2), the upper and lower straightening rolls ( 5, 6) are arranged in such a way that they form a straightening gap (3) between an inlet (8) and an outlet (9) of the straightening machine in a work area (4) so that the metal strip or metal part to be straightened can be straightened from above and below to act and to lead this in a working direction (7) from the inlet (8) to the outlet (9) through the straightening machine, and with a lower slide plate (15) with which the lower straightening rollers (6) on an operating side of the straightening machine transversely to the working direction (7) of the straightening machine moved out of the working area (4) and again can be retracted, the upper straightening rollers (5) at least on the operating side of the straightening machine in an upper bearing strip (12) and the lower straightening rollers (6) at least on the operating side of the straightening machine in a lower bearing strip (13) and the top and bottom lower bearing strips (12, 13) are detachably fastened directly or indirectly in the respective roller frame (1, 2), in particular using a straightening machine according to at least one of claims 1 to 8 or using a straightening machine with maintenance device according to claim 9, the method being the comprises the following process steps: - Raising the upper roller frame (1) and / or lowering the lower roller frame (2) to widen the straightening gap (3), - Insertion of an interchangeable prism (22) into the widened straightening gap (3) by placing it directly or indirectly on the lower straightening rollers (6), - Loosen the upper bearing strip (12) from the upper roller frame (1) and deposit the upper straightening rollers (5) on the interchangeable prism (22), - Loosen the lower bearing strip (13) and / or the lower slide plate (15) from the lower roller frame (2), - Pulling out the lower slide plate (15) together with the exchangeable prism (22) resting on the lower straightening rollers (6) and the upper straightening rollers (5) resting on the exchangeable prism (22) from the working area (4) of the straightening machine. A method according to claim 12, wherein before the lower slide plate (15) is pulled out, the upper bearing strip (12) is coupled to the lower bearing strip (13) in order to ensure that the upper bearing strip (12) together with the upper straightening rollers (5) with the lower bearing strip (13), the lower straightening rollers (6) and the lower slide plate (15) is pulled out of the working area (4) of the straightening machine. Method according to one of claims 12 or 13, wherein after pulling out the lower slide plate (15) the upper straightening rollers (5) from the upper bearing strip (12) to be able to remove individual straightening rollers (5). Method according to claim 14, wherein the release of the upper straightening rollers (5) from the upper bearing strip (12) takes place with the aid of a retaining strip (27) which is provided with receptacles (28) for the upper straightening rollers (5) in which the upper ones Straightening rollers (5) are fixed at least in one axial degree of freedom, the retaining strip (27) being moved relative to the upper bearing strip (12) in an axial degree of freedom in order to release the upper straightening rollers (5) from the upper bearing strip (12).

Images