EP1849535B1 - Roll stand - Google Patents

Abstract

The roll stand for the rolling tube, comprises a roll (3) present on a roll shaft (2), which is detachably connected in an axial end over a coupling (4) with a drive shaft (5), and a roll changing device (6) exhibiting devices for lowering or lifting the roll from its working position into a roll changing position, drawing cars (9) for moving a coupling part (10) arranged in longitudinal direction of the roll shaft, coupling device, a coupling support for mounting the coupling in non-displaceable or fixed manner, and two roll racks fixedly arranged on base frame of the roll stand. Roll stand for the rolling tube, comprises a roll (3) present on a roll shaft (2), which is detachably connected in an axial end over a coupling (4) with a drive shaft (5), and a roll changing device (6) exhibiting devices for lowering or lifting the roll from its working position into a roll changing position, drawing cars (9) for moving a coupling part (10) arranged in longitudinal direction of the roll shaft, coupling device, a coupling support for mounting the coupling in non-displaceable or fixed manner, and two roll racks fixedly arranged on base frame of the roll stand. The coupling device is arranged in an axial end of the roll shaft with the coupling part arranged on the drawing cars. The coupling part is formed as a sheet with a slit- or U-shaped cavity and the coupling device is formed as a shaft with annular groove. The inner width of the groove in groove base is slightly smaller than the width of the slit- or the U-shaped cavity in the coupling part. The drawing cars exhibit a reception for one of chocks of the roll in order to move the roll in the axial displacement of the drawing cars, and a guidance forming a positive connection between the drawing cars and the chocks. The drawing car is movable relative to the roll stand in horizontal direction by means of a moving element (17). The guidance exhibits a contact surface extending vertically itself for the chocks.

Description

The invention relates to a rolling stand according to the preamble of patent claim 1.

It is known to proceed as follows when changing rolls in a roll stand: When changing rolls, the rolls are removed from the molding plant together with attached parts, in particular the roll shaft and the chocks, in order then to rebuild or replace the rolls outside the rolling line.

Usually, a chock is dismantled from the roll shaft for roll change, the roll is then removed from the roll shaft, mounted another roll and mounted the Lagereinhelt again. Off-line changing devices are often used to aid in changing the roller. After replacing the roller, the entire unit is then reinstalled in the molding line.

At one by the GB 1 210 738 A become known rolling mill of the type mentioned, the rollers are supported in the frame and then pulled out the rollers shafts axially from the rollers, which are then exposed for lifting out of the rolling mill by crane. To prepare for this roll change However, many manual intervention and various tools are required.

The change of the roller in such a rolling stand therefore requires a considerable time, so that as long as the system is not available. This means that there is a corresponding economic disadvantage, the change also requires a high handling effort.

At one by the DE 39 12 684 A1 become known roll stand of the type mentioned, the front roll stand is permanently mounted on a removable plate. After the roller axles have been removed from the bushings of the rear roller stand, the front roller stand, on which the roller axles and the rollers are located, is moved out by means of the movable removable plate and replaced by a completely prepared, different roller stand with new rollers.

Dar invention is therefore the object of developing a rolling stand so that changing the roller with less effort and thus faster possible. The downtime of the framework during roll change should be reduced. Furthermore, the handling effort when changing the roll should be reduced.

• einen Ziehwagen zum Bewegen eines auf diesem angeordneten Kupplungsteils in Längsrichtung der Walzenwelle und
• in einem axialen Endbereich der Walzenwelle angeordnete Kupplungsmittel zum formschlüssigen Zusammenwirken mit dem auf dem Ziehwagen angeordneten Kupplungsteil, wobei das Kupplungsmittel als wellenförmiger Fortsatz mit in einem axialen Endbereich ringnutförmiger Eindrehung und das auf dem Ziehwagen angeordnete Kupplungsteil mit einer schlitzartigen Ausnehmung ausgebildet ist, in die sich beim Absenken der Walze die Eindrehung einfädelt, womit sich das Kupplungsmittel und damit die Walzenwelle in Richtung der Walzenwelle unverschieblich mit dem Ziehwagen verbindet.

This object is achieved by a rolling mill with the features according to claim 1, therefore, the roll changing device comprises:

• a pulling carriage for moving a coupling part arranged thereon in the longitudinal direction of the roller shaft and
• arranged in an axial end portion of the roller shaft coupling means for positive engagement with the arranged on the drawing carriage Coupling part, wherein the coupling means is formed as a wave-shaped extension with ringnutförmiger recess in an axial end portion and the pulling carriage arranged on the coupling part with a slot-like recess in which threading during lowering of the roller threading, bringing the coupling means and thus the roller shaft in the direction the roller shaft connects immovably with the drawing carriage.

In this case, according to further development, the coupling part arranged on the pulling carriage is designed as a plate provided with the slot-shaped or a U-shaped recess and the recess of the coupling means as an annular groove, wherein the clear width of the annular groove in the groove base is slight smaller than the width of the slot or the U-shaped recess in the coupling part. For a particularly simple and safe engagement of the roller shaft on the drawing carriage is possible.

The roll changing device may further comprise a coupling holder for mounting the coupling, so that the clutch is held axially non-displaceable, preferably stationary.

The roll changing device may further comprise two roll trays arranged in the axial end regions of the roll. These are provided with contact surfaces on which the roller can be placed in order to remove the roller shaft. The roll trays can be arranged stationary on the base frame of the roll stand.

The drawing carriage may have a receptacle for one of the chocks of the roller, in order to move it during the axial displacement of the drawing carriage.

The drawing carriage may be displaceable relative to the rolling stand in the horizontal direction by means of a moving element. As a moving element is usually a hydraulic piston-cylinder system are used.

The drawing carriage can also have a guide which can produce a positive connection between the drawing carriage and one of the chocks of the roller. The guide preferably has a vertically extending contact surface for the chock. Due to the vertical guide the chock with the pulling carriage is connected horizontally movable, so that the chock must take only the tilting forces and moments of the roller shaft, but not the peel forces when pushing in and out of the roller shaft.

With the proposed embodiment of a roll stand, it is possible to change the roll directly in the molding plant, d. H. in the rolling line, wherein the integrated roll changing device pulls only the roll shafts out of the rolls, so that the rolls are then exposed.

Fig. 1

schematisch ein Walzgerüst für das Rohrwalzen, in Walzrichtung betrachtet;

Fig. 2a

in vergrößerter Darstellung die Walzenwechselvorrichtung in eingefahrenem Zustand;

Fig. 2b

die Darstellung gemäß Fig. 2a in ausgefahrenem Zustand der Walzenwechselvorrichtung;

Fig. 3

in weiter vergrößerter Darstellung die Walze, die Walzenwelle und die Walzenwechselvorrichtung in der Position gemäß Fig. 2a;

Fig. 4a

die Seitenansicht des Walzgerüsts vor dem Herausheben der zu wechselnden Walze; und

Fig. 4b

die Darstellung gemäß Fig. 4a nach dem Herausheben der Walze.

Further details of the invention will become apparent from the illustrated in the drawings embodiment of the invention. Show it:

Fig. 1

schematically a roll stand for tube rolling, viewed in the rolling direction;

Fig. 2a

in an enlarged view, the roll changing device in the retracted state;

Fig. 2b

the representation according to Fig. 2a in the extended state of the roll changing device;

Fig. 3

in a further enlarged view of the roller, the roller shaft and the roll changing device in the position according to Fig. 2a ;

Fig. 4a

the side view of the roll stand before lifting out the roller to be changed; and

Fig. 4b

the representation according to Fig. 4a after lifting the roller.

In Fig. 1 There is shown a rolling stand 1 in which a plurality of rolls roll a sheet, not shown, to a tubular body, which is then welded into a pipe. In particular, a lower roller 3 can be seen, as well as side roller beams 20 and 21. The roller 3 which is considered in more detail here is mounted on a roller shaft 2 which passes through a central bore in the roller 3.

The drive of the roller 3 via a drive shaft 5, which is designed as a propeller shaft and is connected via a coupling 4 with the roller shaft 2.

To change the roller 3, a roller changing device 6 is present, which is explained in more detail below. It is essential that the roll changing device 6 is integrated into the roll stand 1.

As is best seen in conjunction with the other figures, the roll changing device 6 has a drawing carriage 9 which is movable horizontally and in the direction of the axis of the roll 3 and the roll shaft 2, respectively. For this purpose, a movement element 17 is provided, which is designed as a hydraulic piston-cylinder unit. As from the synopsis of FIGS. 2a and 2b can be seen, the drawing carriage 9 from a retracted position ( Fig. 2a ) into an extended position ( Fig. 2b ) and back.

The roller 3 together with the roller shaft 2 are initially - when rolling - in a working position, not shown, in which they are held by two lower roller positions 7 and 8. The lower roller stations 7 and 8 can simultaneously serve as a means by which the roller 3 can be lowered or raised to roll change. In the Figures 2 and 3 the roller 3 together with the roller shaft 2 is in a lowered position, which is approached to roll change. The roller 3 is placed on two roll trays 13 and 14, which hold them in a roll change position.

For roll change, the roll 3 is thus moved to a change position, which is not the working position. The roller installation is axially fixed in the working position, z. B. by means of a bayonet, and is released in the change position, ie the bayonet lock is released. In the exemplary embodiment, the roller is moved down to change.

On the left in Fig. 3 is a coupling means 11 to see, which is firmly connected to the roller shaft 2. The coupling means 11 is formed as a wave-shaped extension, which has an annular groove-shaped recess 24 in a left axial end region (s. Fig. 3 ): On the drawing carriage 9, a coupling part 10 is arranged, which is in the present case designed as welded on the pulling carriage 9 sheet metal. In the sheet metal, a slot or a - viewed from the side - U-shaped recess is incorporated. The inside width of the slot or the U-shaped recess is only slightly larger than the inside diameter of the annular groove 24th

This has the consequence that when lowering the roller 3 together with the roller shaft 2 and coupling means 11 acting as a coupling pin coupling means 11 is threaded with the annular groove 24 in the slot or in the U-shaped recess in the coupling part 10. Thus, the coupling means 11 and thus the roller shaft 2 in the direction of the axis of the roller shaft 2 is immovably connected to the pulling carriage 9.

Simultaneously with the lowering of the roller shaft 2, the roller shaft coupling 4 is deposited on a coupling holder 12 which is fixed on the base frame 15 of the rolling stand 1. As already mentioned, the roll 3 is thereby placed on the roll trays 13 and 14. The left chock 16 of the roller 3 is connected to the pull carriage via a vertically extending guide 18 to hold the roller shaft 2 in a horizontal position. The guide 18 has over the coupling part 10 an axial degree of freedom. This ensures that the pulling force is transmitted directly to the roller shaft 2 and not via the chock 16 and the bearings. Due to the vertical guide 18, the chock 16 is horizontally movably connected to the pulling carriage, so that it only has to absorb the tilting forces due to the dead weight of the roller shaft 2, but not the pull-off forces during insertion and removal of the roller shaft 2, as explained below.

Since the clutch 4 is arranged non-displaceably on the clutch holder 12 in the direction of the axis of the roller shaft 2, the roller shaft 2 can be withdrawn from the bore in the roller 3 in the axial direction upon actuation of the movement element 17. So there is a movement of the in Fig. 2a in the in Fig. 2b position shown. The roller 3 is thereby exposed, so that it can be replaced. The right chock 19 remains in the position shown, s. Fig. 2b and 3 , The left chock 16 and the roller shaft 2 remain one unit.

Out Fig. 4a and 4b It can be seen how, after pulling out the roller shaft 2 from the roller 3, the roller 3 can be changed. A crane 23 carries a roller transport and insertion device 22, which can engage and lift the roller 3 by means of a lower handle 25. The roller 3 is lifted out of the rolling stand 1 and another roller inserted into the frame and deposited on the roll trays 13 and 14.

The fixing of the roll in the rolling stand is carried out in accordance with the reverse order as in disassembly, d. H. First, the roller shaft 2 is inserted through the hole in the roller 3 and in the chock 19. By means of the roller adjustments 7, 8, the roller 3 can then be driven directly into the working position.

The roll changing device is thus designed so that the pull-off forces when pulling out the roll shaft 2 via the coupling means 11 (dome bolts) act directly on the roll shaft 2. This has the advantage that the rolling bearings in the chocks 16, 19 are not loaded during roll change and thus can not be damaged.

LIST OF REFERENCE NUMBERS

1

rolling mill

2

roller shaft

3

Roller (lower roller)

4

clutch

5

drive shaft

6

Roll changing device

7

Means for lowering or raising the roller (lower roller setting)

8th

Means for lowering or raising the roller (lower roller setting)

9

drawing carriage

10

coupling part

11

coupling agent

12

coupling support

13

roller tray

14

roller tray

15

base frame

16

chock

17

mover

18

guide

19

chock

20

Side roll beam

21

Side roll beam

22

Roller transport and insertion device

23

crane

24

ring groove

25

undercling

Claims (9)

1. A roll stand (1) with at least one roll (3) that is situated on a roll shaft (2) during its intended use, wherein the roll shaft (2) extends through a central bore of the roll (3), wherein the roll shaft (2) is detachably connected to a drive shaft (5) in an axial end region by means of a coupling (4), and wherein the roll stand (1) is assigned a roll changing device (6), by means of which the roll shaft (2) can be withdrawn from the roll (3) after positioning the roll (3) in a roll changing position, in which the roll (3) is supported in the roll stand (1),
   characterized in
   that the roll changing device (6) features:

   a carriage (9) for moving a coupling part (10) arranged thereon in the longitudinal direction of the roll shaft (2), and

   a coupling means (11) that is arranged in an axial end region of the roll shaft (2) and serves for positively interacting with the coupling part (10) arranged on the carriage (9), wherein the coupling means (11) is realized in the form of a shaft-shaped extension with an annular turned groove (24) in an axial end region and the coupling part (10) arranged on the carriage (9) is realized with a slot-like recess, into which the turned groove (24) is threaded when the roll (3) is lowered such that the coupling means (11) and therefore the roll shaft (2) is immovably connected to the carriage (9) in the direction of the roll shaft (2).
2. The roll stand according to Claim 1,
   characterized in
   that the coupling part (10) arranged on the carriage (9) is realized in the form of a sheet provided with the slot-shaped or a U-shaped recess and the turned groove (24) of the coupling means (11) is realized in the form of an annular groove, wherein the clear width of the annular groove in the groove base is slightly smaller than the width of the slot or the U-shaped recess in the coupling part (10).
3. The roll stand according to Claim 1 or 2,
   characterized in
   that the roll changing device (6) features a coupling holder (12) for attaching the coupling (4) such that the coupling (4) is held in an axially immovable or stationary fashion.
4. The roll stand according to one of Claims 1 to 3,
   characterized in
   that the roll changing device (6) furthermore features two roll racks (13, 14) that are arranged in the axial end regions of the roll (3).
5. The roll stand according to Claim 4,
   characterized in
   that the roll racks (13, 14) are stationarily arranged on the base frame (15) of the roll stand (1).
6. The roll stand according to one of Claims 1 to 5,
   characterized in
   that the carriage (9) features a receptacle for one of the chocks (16) of the roll (3) in order to move this chock along during the axial displacement of the carriage (9).
7. The roll stand according to one of Claims 1 to 6,
   characterized in
   that the carriage (9) can be displaced relative to the roll stand (1) in the horizontal direction by means of a motion element (17).
8. The roll stand according to one of Claims 1 to 7,
   characterized in
   that the carriage (9) features at least one guide (18) that can produce a positive connection between the carriage (9) and one of the chocks (16) of the roll (3).
9. The roll stand according to Claim 8,
   characterized in
   that the guide (18) features a vertically extending contact surface for the chock (16).

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