EP1909982B1 - Device for placing a brush against a roller - Google Patents

Abstract

The invention relates to a device for placing a brush (1) against rollers (2), for example in roll stands, in particular against the working and/or support roller of a roll stand for the hot rolling of aluminium, wherein the brush (1) is mounted on a pivot lever and can be placed in contact against the roller (2) by means of a placement device (3) which exerts a placement force. It is provided here according to the invention that the placement device (3) for the brush (1) comprises at least one adjusting element (5) which is arranged so as to be rotatable with respect to the pivot lever (12) and which is operatively connected to the pivot lever by means of a force transmission element (4). A regulating circuit (6) is designed to regulate the placement force to be constant, proceeding from a nominal force F0, in such a way that, by means of a monitoring device (7) for the rotational angle of the adjusting element (5) with respect to the pivot lever, the placement force can be regulated to be constant by means of at least one actuating element (8).

Description

The invention relates to a device for applying a brush to a roller, e.g. in rolling mills or strand guiding devices, in particular on the working and / or supporting roll of a rolling stand for hot rolling aluminum, according to the preamble of patent claim 1.

Basically, there is a need for devices for adjusting a brush to rollers in rolling stands, regardless of the roll or roller diameters used and their working positions, as well as regardless of the wear of the brush to be able to set a substantially constant contact force. On the one hand, such embodiments of devices for setting a brush on rollers or rollers in rolling stands are known from the prior art, in which an automatic correction of the brush wear is dispensed with. On the other hand, such embodiments are known in which e.g. a manual adjustment of a stop takes place. The latter embodiments have the particular disadvantage that a manual adjustment of stops for the setting of a substantially constant contact force at different roller diameters and roller diameters and their working positions are not suitable. Also known from the prior art are such embodiments in which a cylinder is used to achieve the working positions, as well as an additional pneumatic cylinder to produce a constant contact pressure via pressure control. Such solutions require an additional medium, low-friction seals, etc. For this purpose, reference is made to the following documents with regard to the prior art:

From the EP 0605 833 B1 is a device for adjusting a brush roller, in particular to the work roll of a rolling stand for hot rolling of aluminum, in which the brush roller is rotatable against the work roll position and parallel to the work roll translationally and is mounted in swivel brackets on both sides. The pivot bearing of each brush roll holder is arranged on the work roll chock, furthermore, the holder has a pivot lever which is located between a controllable actuating element and a restoring support element, wherein the actuating element arranged in the balancing block or bending block for the work rolls and the support element on the work roll chock are. It is provided in one embodiment that the actuating element is a hydraulically double acted piston-cylinder unit whose piston shaft rests on the pivot lever. Furthermore, it is provided that the support element consists of the pivot lever abutting support rod and a support cylinder, wherein the support rod against a spring assembly in the support cylinder is submersed and the support cylinder is pivotally mounted (bearing block) on the work roll chock. It may be provided that the actuating element is arranged for the pivot lever in the provided with at least one hydraulic cylinder balancing block for the work rolls, in another embodiment, it is provided that the actuating element for the pivot lever provided with at least one hydraulic cylinder fixed or displaceable bending block is arranged for the work rolls. It should be improved with such trained device for the employment of a brush roller, the previously used Bürstenanstellsysteme and in particular on such scaffolding, where the installation and conversion ratios are extremely cramped.

With the pivotable brush holder described here, in particular, the advantage is to be achieved that there is no relative movement in the vertical plane between the brush holder and the chock. There is also no relative movement between the holder, the actuating element and the support element present. Compared to the previously known solutions, there is also no change in the lever ratios and, consequently, no change in the contact pressure of the brush roller to the work roll when changing the scaffold run. In addition, going to be a very space-saving Achieved design that could be integrated into existing structural elements of the rolling stand. In a work roll change no complex assembly or disassembly measures or additional adjustments are required. The operation of the described embodiment is such that in a setting position for the brush roller, these brush roller and the work roll are preset to a Mindestabstandsmaß. Superficial concern of the two parts can be effected by actuation of the piston-cylinder unit. For this purpose, a hydraulic pressure medium is forced into the cylinder space of this actuating element, whereby the piston and the piston shaft is lowered in the direction of the roll chock. As a result, the head of the piston rod pushes down the pivot lever of the holder at the contact surface against the spring force of the support member down, whereby the brush roller is moved to the work roll until it abuts against this. If the piston-cylinder unit hydraulically relieved, the piston shaft of this unit moves upward and the spring-loaded support rod moves to the same extent upwards and acts on the pivot lever such that the holder of the brush roller and thus the brush roller itself to the pivot bearing pivots away down to a predetermined distance between the two rollers. This distance is set by appropriate adjustment of a limiting element on the support rod adjustable.

The DE-OS 21 50 781 refers to a rotary brush adjusting device for cleaning the work rolls of a quarto scaffolding. It is envisaged that the bearings of the brushes are attached to rings which are rotatably mounted on the roller-side bearing caps of the backup roll chocks. In one embodiment, the rings are provided with an outer toothing, in which on the side facing away from the work roll, a drive pinion engages. It is further provided that the pinion is mounted on a shaft mounted in the chock, on whose exiting on the outside of the stator end an adjusting lever is rotatably disposed on which the piston rod of a mounted on the chock pressure cylinder is attached. With such a setting device, it should be possible to keep the area between the work roll and support roller bearings of a linkage free. The brush bearings are intended to be guided exactly by the rings, wherein, as mentioned, the rings may be provided with an outer toothing, in which on the side facing away from the work roll, a drive pinion engages. There are attached as a drive of the pinion pressure medium cylinder to the chocks, the piston rods engage each with an adjusting lever, which is anchored to the emerging on the outside of the chocks ends of the waves. By loading the cylinder, the bearing rings are rotated and the roller brushes either swung toward or away from the work roll. In order to ensure a uniform adjustment of the roller brushes over the two cylinders, both pinions are rotatably connected to each other via a shaft.

In these known adjusting devices for rotating brush rollers or the like, it is particularly disadvantageous that, in order to provide a constant setting force, a large number of parameters, such as e.g. a change in the roller or roller diameter used and their working positions, as well as a wear of the brushes is monitored. It is particularly disadvantageous in a mechanical adjustment by means of cylinders, that due to different strokes or movements, the force directions and lever arms and thus the resulting Anstellkräfte be changed to the brush. On the force on the cylinder thus a desired constant contact force on the brush is not adjustable.

Based on this, the present invention seeks to improve or further develop the known devices for the employment of a brush while maintaining the previous advantages in such a way that with simple means regardless of the roll diameters used and their working positions as well as regardless of the wear of the brush a constant contact force can be adjusted.

The object is achieved in that the adjusting device for the brush comprises at least one rotatably arranged in relation to the pivot lever adjusting element and a force transmission element for forming an operative connection between the pivot lever and the adjusting element; a monitoring device is provided for monitoring the angle of rotation of the Vestellelementes with respect to the pivot lever; and a control circuit is provided for keeping constant the adjusting force of the brush against the roller to a predetermined desired force F ₀ by balancing or keeping constant the monitored by the monitoring device rotation angle via at least one actuator.

In this way, a device for hiring a brush is created for the first time by simple means, in which regardless of the roll diameters used and their Arbeitspositonen and also regardless of the wear of the brush, a constant contact force can be adjusted. In the arrangement according to the invention, advantageously only one parameter, namely the angle of rotation, needs to be monitored in order to keep the setting force constant. It is done via the twist angle, a conclusion on the force on the brush. The parameters which change during, for example, rolling, such as roller wear (smaller diameter), brush wear or a changed position of the rollers, have no influence on the amount of the setting force because their changes are automatically compensated by the construction according to the invention. This also applies to changing diameters or working positions when changing roles. With the arrangement according to the invention a very simple and functional control of the adjusting force is achieved when using only a few additional components, in particular no additional components such as an additional pneumatic or hydraulic control are required. The brushes are used in particular for cleaning the rollers.

In the preferred embodiment of the present invention, the force transmission element between the adjusting element and pivot lever is designed as a compression spring. This is a structurally simple embodiment.

According to a further embodiment feature of the present invention, it is provided that the adjusting element arranged so as to be rotatable with respect to the pivoting lever is designed as an adjusting lever mounted rotatably about the pivoting axis. Such a design allows a particularly simple detection of the rotation angle. It is recommended that the rotating brush device is mounted at one end of a pivot lever whose diametrically opposite end is also mounted in the pivot axis.

It is recommended according to a further embodiment feature of the present invention, that the actuator for the constant control of the contact force is designed as Hydraulikzvlinder. About this hydraulic cylinder a constant control of the contact force is easily possible. It is provided in a preferred embodiment that the actuator for the constant control of the contact force is formed as acting on the lever Hydraulikzvlinder.

It is expedient, according to a further embodiment feature of the present invention, that the monitoring device for the angle of rotation is designed as a rotary encoder. With this rotary encoder, the force change is converted into a change in angle to determine the current actual value for the angle of rotation in a simple manner.

It is recommended according to a further embodiment feature of the present invention that the specification for the desired force F ₀ for the control loop is formed by the brush type dependent. It is further provided that the specification for the desired force F _{0 is formed} for the control loop of the roll width dependent.

According to a further feature of the present invention may optionally be provided that the specification for the desired force F _{0 is designed} for the control loop of the roll material, further may optionally be provided according to a last feature of the present invention that the default for the desired force F ₀ is designed for the control loop of the strip material dependent.

The invention is illustrated in the figures of the drawing in an embodiment.

Fig. 1

eine schematische Seitenansicht der erfindungsgemäßen Vorrichtung zur Anstellung einer rotierenden Bürstenvorrichtung mit der Bürstenvorrichtung in ihrer Nullage,

Fig. 2

die schematische Seitenansicht gemäß der Fig. 1 der Zeichnung mit der Bürstenvorrichtung in ihrer wirksamen, an der Rolle befindlichen Lage,

Fig. 3

eine schematische Darstellung des Regelkreises der erfindungsgemäßen Vorrichtung zur Anstellung einer Bürste.

Show it:

Fig. 1

a schematic side view of the device according to the invention for the employment of a rotating brush device with the brush device in its zero position,

Fig. 2

the schematic side view according to the Fig. 1 the drawing with the brush device in its effective position on the roll,

Fig. 3

a schematic representation of the control loop of the device according to the invention for the employment of a brush.

The inventive device for employment of a preferably rotating, generally designated 1 brush is intended for use on rollers, for example in rolling stands, in particular on a working and / or support roller of a roll stand for hot rolling of aluminum. However, the device according to the invention can also be provided, for example, for use in rolls in a strand guide. It is in the Fig. 1 the drawing, the inventive device for employment of a rotating brush 1 in its neutral position and in the Fig. 2 shown in their effective, located on the designated 2 roll position. It is in these two figures different working positions of this roller 2 indicated schematically. The main design features of a roll stand are known to those skilled in the art and therefore not shown in detail in the drawing. The brushes are used to clean the rollers.

In the apparatus according to the invention, the preferably rotating brush 1 is rotatable against the roller rotation and mounted parallel to the roller 2 and translationally displaceable. As a result of the translational displacement, the rotating brush can be brought into contact with the rollers 2 via a setting device 3 that applies a positioning force, see FIG Fig. 1 or 2 , It is inventively provided that this adjusting device 3 comprises a rotatable with respect to a pivot lever 12 arranged with the brush 1 adjusting element 5, which is connected via a power transmission element 4 with the pivot lever in operative connection. A control circuit 6 is based on a desired force F ₀ for constant control of the contact force designed such that a monitoring device 7 for the angle of rotation of the adjusting element 5 with respect to the brush 1, the adjusting force via an actuator 8 is constantly controlled. It is in the Fig. 3 this control circuit 6 for employment of the rotating brush 1 shown schematically.

With these means, a device for employment of a rotating brush device 1 is created for the first time, in which a constant adjusting force can be set independently of the roller diameters used and their working positions as well as independently of the wear of the brushes, whereby in the arrangement according to the invention only one parameter, namely, the angle of rotation needs to be monitored in order to keep the contact force constant. It is done by rotation of the Vestellelementes 5 with respect to the rotating brush 1 on the angle of rotation a conclusion on the force on the brush. Parameters that change during rolling, such as roller wear (smaller diameter), brush wear or a changed position of the rollers, have no influence on the setting force because these changes are compensated. This also applies to each other Diameter or working positions when changing roles. With the arrangement according to the invention a very simple and functional control of the adjusting force is achieved when using only a few additional components, in particular no additional components such as an additional pneumatic or hydraulic control are required.

In the embodiment of the arrangement according to the invention shown in the figures, the force transmission element 4 between adjusting 5 and rotating brush device 1 is formed as a compression spring 9. About this compression spring 9, a twist angle of the adjusting element 5 with respect to the brush 1 and the pivot lever can be implemented in linear dependence in a change in the contact force. It is, see again the Fig. 1 or 2 , which is rotatably arranged with respect to the brush 1 adjustment 5 as about the pivot axis 10 rotatably mounted lever 11. The rotating brush 1 itself is mounted on a pivot lever 12, whose diametrically opposite end is mounted in the pivot axis 10. With such a design, a particularly simple detection of the rotation angle is made possible.

The actuator 8 for the constant control of the contact force is in the illustrated embodiment, see again the Fig. 1 and 2 the drawing, as formed on the adjusting lever 11 via a not designated here joint attacking hydraulic cylinder 13. About this acting on the lever 11 hydraulic cylinder 13 a constant control of the contact force is easily possible. The monitoring device 7 for the angle of rotation is designed as a rotary encoder 14, see first the Fig. 1 and 2 the drawing. With this rotary encoder 14, the force change is converted into a change in angle for determining the current actual value for the twist angle in a simple manner.

In the arrangement according to the invention is also provided that the specification for the desired force F ₀ for the control circuit 6 of the brush type (eg type of Brush hair) and is formed depending on the roll width. Optionally, it can furthermore be provided that the specification for the setpoint force F ₀ for the control loop 6 is designed to be dependent on the roll material and / or on the rolling stock (eg steel, copper or the like).

With the arrangement according to the invention can be adjusted regardless of the roll diameters used and their Arbeitspositonen as well as independently of the wear of the brush a constant contact force. This is, see the Fig. 3 of the drawing, which shows a schematic representation of the control loop 6 of the device according to the invention, in a conversion unit 15, the predetermined desired force F _soll in a desired angle α _{soll converted} for the angle of rotation, which is a target actual value comparator 16 is supplied. With this desired actual value comparator 16, the control deviation e of the angle of rotation is then determined by comparison with the current actual value α _, which _is supplied to a controller 17. The output of the actuator 8 and the hydraulic cylinder 13 is then fed to the trained as a rotary encoder 14 monitoring device 7 for the angle of rotation, wherein the monitoring device 7 finally the Angle of rotation changes so that the control deviation is set as close as possible to zero and the setpoint force. The current actual value α _is then subsequently monitored and fed back again to the desired actual value comparator 16 and a new control deviation e is determined to repeat the process.

As already mentioned, the illustrated embodiments are to be considered only as an example for the realization of the invention, modifications are possible. Thus, in particular the adjusting element 5, the power transmission element 4 and the actuator 8 may have a different from the illustrated embodiments training, is also conceivable, in particular, another storage for the rotating brush device. 1

LIST OF REFERENCE NUMBERS

1

(rotating) brush

2

(Work) role

3

Hiring facility (for 1 to 2)

4

Kraftübertragungslemement

5

adjustment

6

loop

7

monitoring device

8th

actuator

9

compression spring

10

Swivel axis (from 1)

11

adjusting

12

pivoting lever

13

hydraulic cylinders

14

Rotary encoder

15

Conversion unit F _soll / α _soll

16

Target actual value comparator

17

regulator

e

deviation

Claims (12)

1. Device for placing a brush (1) against a roller (2) for shaping or guiding strip material, for example in roll stands or strip guidance devices, comprising:

   a pivot lever (12), at one end of which the brush (1) is rotatably mounted preferably parallel to the roller (2) and at the other end of which the pivot lever (12) is mounted to be rotatable about a pivot axis (10); and

   a placing device (3) for placing the brush (1) with a placing force against the roller (2),

   characterised in that the placing device (3) for the brush (1) comprises at least one adjusting element (5), which is arranged to be rotatable with respect to the pivot lever (12), and a force transmission element (4) for forming an operative connection between the pivot lever (12) and the adjusting element (5);
   a monitoring device (7) is provided for monitoring the angle of rotation of the adjusting element (5) with respect to the pivot lever (12); and
   a regulating circuit (6) is provided for keeping constant the force of placing the brush (1) against the roller (2) to a predetermined target force F₀ by regulating or keeping constant the rotational angle, which is monitored by the monitoring device (7), by way of at least one setting element (8).
2. Device according to claim 1, characterised in that the force transmission element (4) is formed between the adjusting element (5) and the pivot lever (5) as a compression spring (9).
3. Device according to claim 1 or 2, characterised in that the adjusting element (5) arranged to be rotatable with respect to the brush (1) is formed as an adjusting lever (11).
4. Device according to any one of claims 1 to 3, characterised in that the adjusting element (5) is mounted to be rotatable about the pivot axis (10).
5. Device according to any one of claims 1 to 4, characterised in that the setting element (8) for constant regulation of the placing force is constructed as a hydraulic cylinder (13).
6. Device according to claim 5, characterised in that the setting element (8) for constant regulation of the placing force is constructed as a hydraulic cylinder (13) engaging the adjusting lever (11).
7. Device according to any one of claims 1 to 6, characterised in that the monitoring device (7) for the rotational angle is constructed as a rotational angle transmitter (14).
8. Device according to any one of claims 1 to 7, characterised in that the presetting for the target force F₀ for the regulating circuit (6) is constructed to be dependent on the brush type.
9. Device according to any one of claims 1 to 8, characterised in that the preset for the target force F₀ for the regulating circuit (6) is constructed to be dependent on the roller width.
10. Device according to any one of claims 1 to 9, characterised in that the preset for the target force F₀ for the regulating circuit (6) is constructed to be dependent on the roller material.
11. Device according to any one of claims 1 to 10, characterised in that the preset for the target force F₀ for the regulating circuit (6) is constructed to be dependent on the strip material.
12. Device according to any one of claims 1 to 11, characterised in that the roller (2) and/or the brush (1) is or are constructed to be rotating.

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