EP0154249B1 - Roll stand with cylinders which are over-mounted on a pair of support spindles - Google Patents

Description

The invention relates to a roll stand with an adjustable (on the fly) interchangeably mounted roller support shaft on a double-sided adjustable roller support shaft pair, in which both roller support shafts have pin projections projecting beyond the roller rings, onto which each pin bearing can be pushed and fixed, while both bearing housings can take up rolling forces are non-positively connectable.

Roll stands of this type, in which the pair of roller drive shafts are supported, for example, in rotatable eccentric bushes belonging to the adjusting device and are driven by spur gears and intermediate drive shafts or articulated spindles, are known (DE-PS 736 879, 1 427974 and 910102). In these roll stand designs, the rolling rings are placed on the free journals of the roll supporting shafts and fixed there. The rolling rings are relatively small; some of them can can be changed manually without the help of a crane. Such scaffolds are primarily used in the prefabricated block of wire lines, since the rolling forces are relatively low there and the one-sided mounting does not pose any difficulties.

In sections of the rolling mill where the rolling forces are significantly greater than in the finished blocks of wire mills mentioned, the same construction principle was used for such streets in order to achieve the advantages of the quick interchangeability of the rolling rings, extraordinarily large bearing dimensions for the roller supporting shafts and corresponding oversizing of the supporting shafts and, above all, larger diameters of the rolling rings themselves. The reason for this is that with the same rolling forces, the roller-side bearing of the one-sided bearing is loaded more than twice as much as the bearing of a two-sided bearing. The occurring rolling forces could only be reduced by a corresponding reduction. the reduction of the rolling stock per pass; however, this would in turn lead to an increase in the total number of scaffolds and thus a considerable increase in the manufacturing effort and also the operating costs.

Roll stands for this area of application have therefore so far been equipped with double-sided bearings on both sides of the roll or the rolling ring. The difficulty of changing the rollers associated with this training was accepted.

The invention has for its object to improve roll stands of the generic design so that they are able to absorb significantly larger rolling forces despite one-sided mounting of the rolling rings.

Based on a proposal that has become known, according to which the bending forces that occur during the floating mounting of the roller support shafts can be absorbed with the aid of a tensioning device that consists of a pair of journal bearings that can be pushed onto journal projections that protrude beyond the roller rings and can be fixed at a radial distance from one another by screw connections (US-PS 4423612), this object is achieved in that the journal bearings can be positively connected to a pair of adjusting eccentric bushes mounted in a common housing. In the case of a roller bearing shaft pair mounted in adjusting eccentric bushes, these adjusting eccentric bushes of the supporting shaft pair can be detachably rotatably coupled to the adjusting eccentric bushes receiving the journal bearings. These eccentric bushes and the adjusting eccentric bushes of the pair of roller drive shafts can be rotatably coupled. This rotary coupling can consist in that the adjusting eccentric bushes of the pair of roller drive shafts each have a segment approach projecting axially parallel over the respective journal supporting the rollers, which can be inserted into a flange provided on the associated eccentric bushing of the journal bearing. The outer rings of the journal bearing and / or the bearings of the pair of supporting shafts can even form the eccentric bushes.

According to the invention, there is also the possibility of connecting the bearing housings by actuating elements which can be pressurized and can be moved parallel to the direction of attack of the roller support shafts. Both bearing housings can be arranged in a common support frame. This support frame or the one-piece housing can be displaceable in the direction of the roll axis and / or transversely to it, independently of the roll stand receiving the roll support shafts.

The actuating elements should be able to be moved and fixed synchronously with the actuating elements of the adjusting device arranged in the roll stand, which move the roller supporting shafts in the adjusting direction. The actuating elements can be piston-cylinder units which are driven directly or via pressure intensifiers and acted upon by pressure medium and are determined by position transmitters. It is also advantageous to use sliding wedge pairs which act on the adjusting elements in the direction of adjustment and can be moved towards and away from one another transversely to the rolling direction and are connected in a manner known per se to a spindle driven by a hydraulic motor. The bearing housings can be connected by tie rods, which form the piston rods of a pair of piston-cylinder units, with one (lower) bearing housing being suspended in the pull rods and the other (upper) bearing housing, carrying the piston-cylinder units, sliding guides for the Has tie rods. The bearing housings are expediently designed in the form of roller bearing chocks with mutually facing, spacing-defining support lugs. Zvi _-. Beautiful the mutually facing sides of the bearing housings, particularly lage.reinbaustücken in the form of roller, can on to that of Orderly, interchangeable, replaceable or adjustable spacers can be introduced.

The exchange of the rolling rings for other rolling rings can be carried out according to a further development feature of the invention with the aid of a support frame which can be rotated about a vertical axis, can be moved in a hanging or rolling manner and which is arranged in pairs at axial spacing of the rolling rings of a pair of rolling rings one above the other and horizontally offset by 180 ° for them Has rolling rings. The bearing housing can also form the support frame itself.

The idea of postponing and fixing the roller bearing shafts to the pin projections projecting beyond the roller rings, and to connect their bearing housing for receiving rolling forces in a form-fitting manner, and the above-described configurations of this idea can also be used for similar machines, e.g. B. roller straighteners, apply advantageously.

The connection of the bearing housings in the various forms of construction described makes it possible to absorb the essential part of the rolling forces in the case of one-sided mounting of the rolling rings, as has hitherto only been the case with the known double-sided mounting on both sides of the roll or of the rolling ring in normal roll stands with two cross members with one another connected roll stands was the case. This creates the possibility of using the one-sided (flying) arrangement of rolling rings where significantly greater rolling forces occur than is the case in wire-finished blocks, without it being necessary to increase the bearing sizes and thus the roll diameters. In addition, roll stands with particularly high rigidity, e.g. B. such can be used with eccentric bushing, and the relatively small dimensions allow the stands to move closer together in the rolling direction. The compact design that can be achieved in this way also makes it easier to modernize existing rolling mills where space is limited.

The application of the inventive concept to such prefabricated wire blocks even makes it possible to reduce their dimensions considerably, and thus to further increase the operating speeds of such blocks, since one of the main problems of increasing the working speed of such prefabricated blocks is the need to reduce the masses of the high-speed revolutions Support shafts and the roller rings is to be looked for.

• Fig. ein Walzgerüst (von der Seite gesehen, teilweise axial geschnitten),
• Fig. 2 die Seitenansicht von Fig. 1 teilweise radial geschnitten,
• Fig. 3 eine andere Ausbildung eines Walzgerüstes von der Seite gesehen im Axialschnitt,
• Fig. einen Schnitt nach der Linie A-A durch Fig. 3,
• Fig.5 ein zusätzliches Ausbildungsmerkmal von der Seite gesehen in schematischer Darstellung und
• Fig. eine weitere Ausbildung des Walzgerüstes.

The roll stand can be used both as a stationary stand and as a changeable stand. B. extendable or portable in the roller mill. It can be used both in contials and in reversing lines, both as a horizontal or vertical or tilting stand. Rolling rings with multiple calibers can also be used. The invention is explained in more detail using the exemplary embodiments shown in the drawing. Show in the drawing

• A roll stand (seen from the side, partially axially sectioned),
• 2 shows the side view of FIG. 1 partially radially cut,
• 3 shows another embodiment of a roll stand seen from the side in axial section,
• 3 shows a section along the line AA through FIG. 3,
• 5 shows an additional training feature seen from the side in a schematic representation and
• Fig. A further design of the roll stand.

As can be seen from FIG. 1, the roller support shafts 2 are mounted in the stands 3a and 3b of the roll stand 3 in pitch eccentric bushes 23a and 23b in bearings 5a and 5b. The eccentric bushes, which are formed in one piece here, can be rotated with the aid of the spindle 35 and thereby bring about the positioning movements of the roller support shafts 2, which are driven by articulated spindles (not shown) via the couplings 6a placed on their pins 2a.

A rolling ring 8 is slid onto each of the studs 2b of the supporting shafts 2 projecting from the stand 3a of the roll stand. The support shafts 2 have pin projections 2c projecting beyond the roller rings 8, onto which the one-piece housing 21 with the pin bearings 11 and 12 is pushed and fixed by axial securing elements 13 which sit on a further outer pin extension 2d of the roller support shafts 2. Each of the journal bearings 11 and 12 is assigned an adjusting device which also consists of eccentric bushes 22a, 22b which are rotatably mounted in the common housing 21 and accommodate the journal bearings 11 and 12. These eccentric bushes 22a, 22b are detachably rotatably coupled to the adjusting eccentric bushes 23a, 23b of the pair of roller support shafts 2 in such a way that the adjusting eccentric bushes 23a, 23b each have a segment projection 23a ', 23b' projecting axially parallel to the respective roller journal 2b an attachment flange 22a 'or 22b' arranged on the associated eccentric bushing 22a or 22b of the journal bearing 11 or 12 can be inserted.

The eccentric bushes 22a, 22b therefore make the rotational movement of the adjusting eccentric bushes 23a, 23b in the assembled state of the roll stand described, so that the journal bearings 11 and 12 follow the changes in the adjusting positions of the roller supporting shafts 2.

As can be seen from FIG. 3, the roller support shafts 2 are also supported in the stands 3a and 3b of the roll stand 3 in eccentric bushes 4a, 4b in bearings 5a, 5b. The eccentric bushes 4a and 4b can be rotated in a manner not shown here with the aid of adjusting elements and thereby effect the adjusting movements the roller support shafts 2, which are driven via couplings 6a de on their journals 2a, indicated by dash-dotted lines, by means of toothed gears 7.

A rolling ring 8 is pushed onto each of the pins 2b of the supporting shafts 2 projecting from the stand 3a of the roll stand 3. The supporting shafts have pin projections 2c projecting beyond the roller rings 8, onto which the bearing housings with the bearings 11 and 12, which are designed here as roller chocks 9 and 10, are pushed on and are also fixed by axial securing elements 13, which are attached to a further, outer pin extension 2d of the roller supporting shafts 2 sit.

As can be seen from FIG. 4, 9 piston-cylinder units 15 are arranged in the upper roller chock, the piston rods 16 of which slide in the chock 9 and carry the lower chock 10 with their end sections. The chocks 9 and 10 are provided with distance-determining support lugs 9a and 10a.

As can be seen from FIG. 3 in connection with FIG. 5, the rolling rings 8 can be placed on the rolling stand 3 placed on the supporting stands 20a arranged one above the other on a supporting frame 20 on the supporting shafts 2 or the spigot extensions 2c and on the spigot extensions 2b in the position shown in broken lines are brought. Then the two bearing chocks 9 and 10 are pushed onto the pin bosses 2c and fixed with the help of the axial securing elements 13. Analogously vice versa, the rolling rings 8 can be pushed from the position shown in dash-dotted lines in FIG. 5 onto the supporting pins 20a of the supporting frame 20 and then, after rotating the supporting frame by 180 °, the replacement rolling rings 20a 'arranged on the other side of the supporting frame 20 are brought into the open position and onto the Pin lugs 2b of the roller support shafts 2 are pushed on.

6, sliding wedges 25a and 25b are arranged between the bearing housings, which are also formed here as chocks 9 and 10, and their wedge surfaces bear against the chocks 9 and 10 by means of a spindle 26, which is driven by a hydraulic motor 27 is driven, are movable towards and away from each other.

Claims (18)

1. Roll stand with rolling rings (8) placed one- sidedly (overhung) and exchangeably on a roll carrier shaft pair (2), which is borne at both ends and to be screwable down, in which both roll carrier shafts (2) display spigot projections (2c), which project beyond the rolling rings (8) and on each of which respective spigot bearings (11, 12) can be pushed and secured, which for the taking- up of rolling forces are force-lockingly connected one with the other to be screwable down, characterised thereby, that the spigot bearings (11, 12) are shape-lockingly connectable with a pair of eccentric screw-down bushings (22a, 22b) borne in a common housing (21).

2. Roll stand according to claim 1 with a roll carrier shaft pair (2) borne in a eccentric screw-down bushings, characterised thereby, that the eccentric screw-down bushings (23a, 23b and 24a, 24b) of the roll carrier shaft pair (2) are detachably coupled rotationally with the eccentric screw-down bushings (22a, 22b) receiving the spigot bearings (11,12).

3. Roll stand according to claim 2 with roll pair borne in eccentric screw-down bushings, characterised thereby, that the eccentric screw-down bushings (23a, 23b and 24a, 24b) are detachably coupled rotationally with the eccentric bushings (22a, 22b) receiving the spigot bearings (11, 12).

4. Roll stand according to claim 3, characterised thereby, that the eccentric screw-down bushings (23a, 23b) of the roll carrier shaft pair (2) each display a respective segment set (23a', 23b'), which projects parallelly with the axis beyond the respective spigot (2b) and is pluggable into an attachment flange (22a', 22b') arranged at the associated eccentric bushing (22a, 22b) of the spigot bearing (11, 12).

5. Roll stand according to one or more of the claims 3 and 4 characterised thereby, that the outer rings of the spigot bearings (11, 12) and/or the bearings (5a, 5b) of the roll carrier shaft pair (2) form the eccentric bushings.

6. Roll stand according to claim 1, characterised thereby, that the bearing housings (9, 10) are connected by setting elements (15,16), which are loadable by pressure and movable parallelly to the screw-down direction of the roll carrier shafts (2).

7. Roll stand according to the claims 1 and 6, characterised thereby, that both bearing housings (9, 10) are arranged in a common carrier frame in an in itself known manner.

8. Roll stand according to claims 1 or 7, characterised thereby, that the carrier frame or the housing (21) is drivable in the direction of the roll axis and/or transversely thereto independently of the roll stand (3) receiving the roll carrier shafts (2).

9. Roll stand according to one or more of the claims 6 to 8, characterised thereby, that the setting elements (15, 16) are movable and securable synchronously with the setting elements (4a, 4b), which move the roll carrier shafts (2) in the screw-down direction, of the screw-down devices arranged in the roll stand (3).

10. Roll stand according to one or more of the claims 6 to 9, characterised by piston-cylinder units which are loadable by pressure medium, drive the setting elements (15,16) directly or by way of pressure transformers and determined in position by position transmitters.

11. Roll stand according to one or more of the claims 6 to 10, characterised by sliding wedge pairs (25a, 25b), which load the setting elements (15,16) in the screw-down direction and movable one towards or away from the other transversely to the rolling direction.

12. Roll stand according to claim 11, characterised thereby, that the sliding wedge pairs (25a, 25b) are connected in an in itself known manner with a spindle (25) driven by an hydraulic motor (27).

13. Roll stand according to one or more of the claims 6 to 12, characterised thereby, that the bearing housings (9, 10) are connected by pull rods (16) forming the piston rod of a piston-cylinder unit pair (15).

14. Roll stand according to claim 13, characterised thereby, that the one (lower) bearing housing (10) is arranged suspended in the pull rods (16) and the other (upper) bearing housing (9) carriers the piston-cylinder units (15) and displays slide guides forthe pull rods (16).

15. Roll stand according to one or more of the claims 6 to 14, characterised thereby, that the bearing housings (9, 10) are constructed in the form of bearing chocks with mutually facing contact projections (9a, 10a) determining the spacing.

16. Roll stand according to one or more of the claims 6 to 9, characterised by spacer members which are exchangeable or appliable and layable between the mutually facing sides of the bearing housings (9, 10) against contact surfaces arranged there.

17. Roll stand according to one or more of the 'claims 1 to 16, characterised by a carrier frame (20), which is rotatable about a vertical axis and movable suspended or rolling, for carrier spigots (20, 20a_'), which are arranged in pairs one above the other at the axial spacing of the rolling rings (8) of a rolling ring pair and one rotationally displaced horizontally relative to the other through 180°, forthe rolling rings.

18. Roll stand according to claim 17, characterised thereby, that the bearing housings (9, 10) or the one-piece housings (21) form the carrier frame (20).

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