EP1907143B1 - Device for rotationally locking the supporting roll balanced architecture of roll stands - Google Patents

Abstract

In a rolling stand (1), especially a plate rolling stand, with a right housing column (2), a left housing column (3), an upper column crosshead (4) that connects them, at least one pair of work rolls and one pair of backup rolls and associated chocks, a balancing device with brackets (5, 6) and a piston rod (7) that extends upward through the column crosshead (4) beyond the upper surface (8) of the column crosshead (4), the piston rod (7) has a yoke (10) at its outer end (9), which yoke (10) is oriented in the rolling direction and engages the brackets (5, 6) of the balancing device, and a rotating sleeve (11), which encloses the piston rod (7), is arranged between the upper edge (12) of the balancing cylinder (22) and the lower edge (13) of the yoke (10), is supported on the column crosshead (4), and has at least one open slot (14) into which the yoke (10) can drop.

Description

The invention relates to a rolling stand, in particular a heavy plate rolling stand according to the preamble of claim 1.

Such a known roll stand is, for example, in FIG. 1 shown. The piston rod moves up or down during back-up roll balancing and thus forms a display device that represents the position of the back-up roll balancing.

Out DE 101 16 988 A1 is a rolling stand with means for raising or lowering the Zwischenwalzen- or Arbeitwalzenschienen when changing the roll known. In this case, the support roller balancing trays are coupled to the upper roller rails by connecting rods so that the roller rails are raised / lowered during lifting / lowering of the support roller balancing traverses.

Out DE 296 03 117 U1 is a Mehrwalzengerüst, in particular Sextowalzgerüst, known, with an upper and a lower support roller, an upper and a lower work roll and optionally an upper and a lower intermediate roll, a means for balancing the back-up rolls, roll bending devices for the work rolls and the intermediate rolls, means for mutual axial displacement of the working and / or intermediate rolls and with means for horizontal parallel displacement of the work rolls or intermediate rolls. The multi-roll stand is characterized by two integrated into the windows of the two roll stand of the rolling mill functional units with two symmetrical and parallel to the roll axis plane arranged hydraulic actuator cylinder pairs, each actuator cylinder pair of an upper actuating cylinder with an upper, acting on the chock of the upper support roller control piston to balance the upper support roller and a lower actuating cylinder with a lower, acting on the chock of the lower support roller actuating piston for balancing the lower support roller and the two adjusting cylinders of each actuator cylinder pair are coaxially installed in a common cylinder housing. The cylinder housing is divided by a bottom in two cylinder chambers, as well as on the adjusting cylinders of the Stellzylinderpaare hydraulically displaceable, double-acting, a bending of the intermediate rolls and the work rolls effecting sleeves, which engage by means of noses or the like to the chocks of the intermediate rolls and the work rolls.

When replacing the working and / or support rollers, the respective chocks are moved away from each other, for example by means of bolts, in order to avoid contact of the respective roll surfaces. That the rolling mill is raised. The paths to be considered are different, so that the corresponding chocks and the Stützwalzenausbalancierung occupy different positions in the stator window or in the rolling stand. In order to maintain this position, the devices in the rolling stand are locked.

The locking systems of backup roll balances are required, on the one hand, to mechanically lock the upper backup roll and the backup roll balance arms, respectively, during inspection work in the rolling stand. Thus, a security for the maintenance staff is given, which is located in the rolling stand with rolled out from the rolling mill work rolls. On the other hand, the lock is used in case of a drop in hydraulic pressure to obtain a defined position for the re-entry of the rolls during the work roll or backup roll change and a related drop in the balance.

In the case of heavy-plate stands, the support-roll balancing is mechanically locked in a roll change position. This is done by means of four hydraulic cylinders, slide the bolt under the attached to upper support arms noses on which the support arms can place. A visual inspection of the proper functioning of these bars is not possible because they are covered by the holding arms and are not accessible. The load capacity is limited by the attachment of the brackets to the upper Ständerraverse in which the bars are moved.

In high - rise scaffolds, the change in level of work rolls and the change of backup roll are different due to the flying bend and the larger support roll chocks. In scaffolds of this type, only one of the two alternating levels has hitherto been mechanically secured. This means that in the other two cases there is a significant security gap if the instructions given in the maintenance manuals are not adhered to.

The invention is therefore based on the object to provide a backup rollers - lock, which is independent of the roll and in both changing positions the support rollers - locked mechanically. The lock should always be easily accessible, visually monitorable and easy to maintain.

This object is achieved by a device with the features of claim 1 in combination.

Further embodiments of the device will become apparent from the relevant subclaims.

rolling operation

If the locking cylinder in the initial position, the yoke carrying the retaining arms dips into the deepest slot of the rotary sleeve. As usual, balancing can approach all possible positions without any mechanical contact. Even the position at which the back-up roller - cylinder drives block can be adjusted without problems.

Locking of the support rollers - balancing when changing work rolls. At the beginning of the work roll change the scaffolding is raised, i. the upper rollers are raised, thereby raising the support roller balance. The locking cylinder rotates the rotary sleeve in stage 1. Then the mechanical adjustment moves to the working roll change level. The backup roll balancing follows and places the yoke on the rotary sleeve. Thus, this position is secured.

Locking of the support rollers - balancing during the backup roller change. At the beginning of the backup roll change the scaffolding is raised, i. the upper rollers are raised, thereby raising the support roller balance. The locking cylinder rotates the rotary sleeve in stage 2. Then the mechanical adjustment moves to the support roller - change level. The backup roll balancing follows and places the yoke on the rotary sleeve. Thus, this position is secured.

The locking system according to the invention is suitable both for new scaffolding as well as for retrofitting old systems. Due to the individual design options The rotating sleeve, this system for all scaffolds, regardless of the roll rise, can be used.

• Hohe Sicherheit für Betreiberpersonal, da Absicherung des Gerüstbereichs bei den Walzenwechseln.
• Hohe Funktionssicherheit durch formschlüssige Kraftübertragung.
• Geringer Wartungsaufwand, da nur ein Verriegelungszylinder.
• Gute Wartungsbedingungen, da sehr gute Zugänglichkeit.
• Sicher verriegelter Zustand optisch sofort erkennbar.
• Elektrische Überwachung der jeweiligen Position.
• Universell einsetzbar für Vor - und Fertiggerüste.
• Nachrüstbar an vorhandene Anlagen.

The advantages of the locking system according to the invention are:

• High safety for operator personnel, as protection of the frame area during roller changes.
• High functional safety through positive power transmission.
• Low maintenance, as only one locking cylinder.
• Good maintenance conditions, as very good accessibility.
• Safe locked state visually immediately recognizable.
• Electrical monitoring of the respective position.
• Universally applicable for pre - and finishing stands.
• Retrofittable to existing systems.

Fig. 1

in teilweise geschnittener Seitenansicht ein zum Stand der Technik gehörendes Walzgerüst;

Fig. 2

in räumlicher Darstellung ein erfindungsgemäßes Walzgerüst;

Fig. 3

in räumlicher Darstellung eine Drehhülse als Einzelteil;

Fig. 4

in Draufsicht die Positionen der Drehhülse bei Walzbetrieb, Arbeitswalzenwechsel und Stützwalzenwechsel; und

Fig. 5

einen Längsschnitt durch das Walzgerüst mit der erfindungsgemäßen Ausbalanciervorrichtung

zeigt.An embodiment of the invention will be described with reference to very schematic drawings, wherein

Fig. 1

in partially sectioned side view of a prior art mill stand;

Fig. 2

in a spatial representation of an inventive mill stand;

Fig. 3

in a spatial representation of a rotary sleeve as a single part;

Fig. 4

in plan view, the positions of the rotary sleeve during rolling operation, work roll change and backup roller change; and

Fig. 5

a longitudinal section through the roll stand with the Ausbalanciervorrichtung invention

shows.

In all figures, the same technical features are provided with the same reference numerals.

FIG. 1 shows in partially sectioned side view belonging to the prior art rolling mill 1 with roller stands 2, 3 and a Ständerraverse connecting them 4. In the Ständerraverse 4 is a Stützwalzenausbalancierung whose piston rod protrudes upwards from the Ständerraverse 4.

FIG. 2 shows a spatial representation of an inventive rolling stand 1 with a left roll stand 2 and a right roll stand 3. These are connected at their upper ends by a Ständerraverse 4 together. A protruding upward from the Ständerraverse 4 piston rod 7 is slotted at its outer end 9 and receives a yoke 10. This, for example, with a bolt attached to the piston rod 7 yoke 10 is aligned in the rolling direction and engages with its ends in the support arms 5, 6 of a balancing device. To the piston rod 7, a rotary sleeve is arranged, which is located on the surface 12 of a Balancierzylinders 22 (see FIG. 5 ) of the balancing device is supported. The yoke 10 is located with its lower edge 13 above the rotary sleeve. In rolling operation, as in FIG. 2 shown, the yoke 10 moves in a slot 14 of the rotary sleeve 11. The slot 14 is in FIG. 3 described in more detail. The rotary sleeve 11 is coupled to a hydraulic cylinder 19, which maintains the position shown in the rolling operation.

When changing the work roll, the scaffold is raised and the yoke 10 and the support arms 5, 6 supported thereon are moved vertically upwards. To lock this position, the rotary sleeve 11 is rotated by means of the hydraulic cylinder 19 about the vertical axis until a position is reached, in which the lower edge 13 of the yoke 10 on the support surface 18 (see FIG. 3 ) rests.

When changing work rolls, the yoke is not placed on the rotary sleeve (surface 18), but held at a distance of about 10 mm above it. The position is approached by the mechanical adjustment and the support roller balancing balances the support roller against the employment. The rotating sleeve secures only to prevent falling of the support rollers and the support arms in the framework in case of failure of the hydraulic system (danger for maintenance personnel with removed work rolls). But it can also be, e.g. during maintenance / repair work for storage on the surface 18 come. The rotating sleeve thus not only serves for the safe storage of the yoke (back-up roller change), but also secures the approached position when changing work rolls with a certain distance. The yoke 10 can not go further down, the opening position for changing the work rolls is secured.

If the back-up rolls are changed in a further step, the framework is raised further, the rotary sleeve 11 is further rotated by means of the hydraulic cylinder until the lower edge 13 of the yoke 10 rests on the upper annular surface 21 of the rotary sleeve 11 and this position is secured.
After changing the working and / or support rollers, the rotary sleeve 11 is again rotated to its original position, in which the yoke 10 can dip into the slot 14.

FIG. 3 shows as a single part in a spatial representation of the rotary sleeve 11. This has axially a slot 14 into which the yoke 10 (not shown) is immersed. For rolling operation of the roll stand 1, the yoke 10 moves vertically up to the support surface 16. When changing the work roll, the rotary sleeve is rotated and the yoke 10 settles on the support surface 18 from. When changing the support roller, the rotary sleeve 11 is further rotated and the yoke 10 settles on the upper annular surface 21 of the rotary sleeve 11 from.

In FIG. 4 is shown in plan view the respective rotational position of the rotary sleeve 11.

The position during rolling operation shows FIG. 4a , The rotary sleeve 11 is aligned in the rolling direction so that the yoke 10 can dip into the slot 14. That is, the yoke 10 moves freely in the slot 14. In this view, support surface 18 (see FIG. 3 to see).
Are the work rolls changed, as in FIG. 4b to see, the rotary sleeve 11 is rotated by means of the hydraulic cylinder 19. The yoke 10, which has been moved all the way upwards, is used to lock onto the support surface 18 (see FIG FIG. 3 ) lowered. Now from the top of the support surface 16 (see FIG. 3 to see).
In a backup roller change the rotary sleeve is rotated in a third switching position. This in Figure 4c illustrated step provides that the lower edge 13 of the yoke 10 comes to rest on the upper annular surface 21 of the rotary sleeve 11. Now both the support surface 16 and the support surface 18 can be seen from above.

By installing the hydraulic cylinder 19, the rotary sleeve 11 is held in each approached position. But it is also conceivable to use another drive for rotating the rotary sleeve 11. Furthermore, it is conceivable to provide further bearing surfaces for depositing the lower edge 13 of the yoke 10 in order to obtain further locking positions. Another embodiment of the rotary sleeve 11 is to form a slot 14 without shelf 18.

FIG. 5 shows a longitudinal section through the rolling mill according to the invention. It is shown how the Balancierzylinder 22 is mounted in an opening of the Ständerraverse 4.

LIST OF REFERENCE NUMBERS

1

rolling mill

2

left roll stand

3

right roll stand

4

stand Traverse

5

holding arm

6

holding arm

7

piston rod

8th

upper surface

9

outer end

10

yoke

11

rotating sleeve

12

top edge

13

lower edge

14

slot

15

paragraph

16

bearing surface

17

paragraph

18

bearing surface

19

hydraulic cylinders

20

bevels

21

upper ring surface

22

balancing cylinder

Claims (3)

1. Roll stand (1), particularly a heavy plate roll stand, with a righthand housing (2), a lefthand housing (3), an upper housing cross member (4) connecting these, at least one working roll pair and backing roll pair as well as chocks associated therewith, as well as a balancing device comprising mounting arms (5, 6) and a balancing cylinder (22), which is suspended by its upper edge (12) in the form of a collar in an opening in the housing cross member (4), and with a piston rod (7) which projects upwardly through the housing cross member (4) and protrudes out beyond the upper surface (8) of the housing cross member (4), characterised in that the piston rod (7) has at the outer end (9) thereof a yoke (10) which is oriented in rolling direction and in which mounting arms (5, 6) of the balancing device engage, as well as a rotary sleeve (11), which encloses the piston rod (7) and is arranged between the upper edge (12) of the balancing cylinder (22) and the lower edge (13) of the yoke (10) and which in that case is supported on the housing cross member (4) and has at least one through slot (14) into which the yoke (10) can enter, that the slot (14) has a first step (15) with a support surface (16), that the slot (14) has a second step (17) with a second support surface (18), and that the rotary sleeve (11) is constructed to be connected with a hydraulic cylinder (19) or with an electric motor.
2. Roll stand according to claim 1, characterised in that a thrust bearing is arranged between the rotary sleeve (11) and the upper edge (12) of the balancing cylinder.
3. Roll stand according claim 1 or 2, characterised in that the slot (14) is formed with entry chamfers (20).

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