EP0291719B1 - Universal rolling mill stand with adjustable horizontal and vertical rolls - Google Patents

Abstract

A universal rolling mill stand with adjustable sets of horizontal rolls and vertical rolls guided in window-type recesses of the roll housings. Each roll housing is formed by a pair of housing posts with cross-members connected by means of transverse supports. The bearing chocks of the set of horizontal rolls are vertically movable between the housing posts of the respective pair of housing posts and the bearing chocks of the set of vertical rolls are moved horizontally between outwardly cantilevering attachments of the pairs of housing posts. The upper cross-members connecting the pairs of housing posts can be raised and swung horizontally. A frame-type cage having plate-like wall members is connectible to lifting devices. The outer surfaces of the wall members of the cage are guided on guide surfaces of the housing posts of pairs of housing posts which face each other. The cage is vertically and horizontally movable with the mill stand and can be installed and removed from the rolling mill stand. The inner surfaces of the wall members of the cage form guide surfaces for adjustment movements of the bearing chucks of one or more of the rolls. The bearing chocks are supported by the cage and/or can be coupled to each other so that one is suspended from the other.

Description

The invention relates to a universal stand with adjustable, in window recesses of the uprights of the roll stands horizontal and vertical roll sets in the form of a universal roll stand with two cross-member connected by cross members, each formed from a pair of uprights with cross-members, in which the bearing chocks of the horizontal roll set the stator bars of the respective stator bar pair, and the bearing chocks of the vertical roller set can be moved vertically or horizontally between the outwardly projecting lugs of these stator bar pairs, and the upper crossbars connecting the stator bar pairs can be lifted or swung out horizontally, and at least between the outer surfaces of the bearing chocks the upper horizontal roller and the mutually facing guide surfaces of the uprights of the uprights have a boundary wall guided on these guide surfaces nder support frame is arranged.

It is known (DE-A-1 602 134) in the case of universal stands the entire set of rolls, namely the upper horizontal rolls, the vertical rolls and the lower horizontal rolls with their bearing chocks with the aid of a support frame which holds them together for the purpose of exchanging the set of rolls for another one. with the rollers and their chocks horizontally laterally out of the roll stand. This cassette type of support frame is characterized by the combination and holding together of the entire set of rollers in the working position of the rollers to each other in the support frame. This represents a kind of second roll stand, which after installation in the actual roll stand is reinforced by it and connected to the auxiliary devices, such as adjusting devices and rolling fittings. Since these support frames have to hold the entire set of rollers together and have to carry them, they are comparatively very heavy and complex. The design also makes it necessary to provide all the guide surfaces required for guiding the bearing chocks of the roller sets in the support frame itself. Furthermore, the width of the stand window of the roll stand must be aligned over the entire height of the window according to the width of those bearing chocks of the roller sets which have the greatest width dimension. With universal stands, these are the bearing chocks of the vertical rollers. This necessity considerably increases the construction costs for the rolling stand comprising the support frame. In another known form of training of universal roll stands (company publication MS SCHLOEMANN-SIEMAG AG W2 / 317 - November 1984 and W2-1158 - June 1981), the two crossbeams connecting the stand spars are first used for inserting and removing the roller sets for the purpose of changing the rollers detached from the rolling stand and lifted off or swung horizontally outwards The upper horizontal roller of the horizontal roller set with its bearing chocks is then lifted out of the roll stand using a crane. The subsequent lifting of the vertical rollers of the vertical roller set with their bearing chocks requires a horizontal movement of the one and then the other vertical roller with the chocks out of the area of these lugs because of the guidance of these bearing chocks between the outwardly projecting lugs of the uprights, so that the vertical rollers then , can also be lifted out of the mill stand one by one with the help of a crane. The lower horizontal roller with its chocks can then also be lifted out of the roll stand.

The expansion of the roller sets and also the installation of the new roller sets therefore require a considerable amount of assembly and time with the resulting long downtimes the entire rolling mill in which the universal stand is located.

Finally, it is also known (DE-A-911 602) after the removal of cross members connecting the uprights of the roll stand to lift the entire set of rolls of a roll stand up out of the roll stand or lower it down again. The bearing chocks of all rollers are detected from the outside, by approaches of a common lever frame, which was formed by roller valve bars, which were upstream or downstream of the rollers in the rolling direction. However, this training proposal did not prevail in practical rolling operations because it was only possible to hold the individual roller chocks under the lever frame formed by the vertical fitting strips and then lift out the entire roller set if appropriate additional tensioning and transverse stiffening elements were arranged. These significantly increased the manufacturing effort and, moreover, made it necessary to dismantle and reinstall numerous fittings and other guide elements that stood in the way of the lifting and lowering process.

The invention has for its object to simplify the installation and removal of the roller sets and thus reduce the time required and the assembly effort.

This object is achieved in that the plate-shaped boundary walls of the support frame for the bearing chocks of the upper horizontal roller alone or for this and the bearing chocks of the vertical roller set form a frame cage which can be connected to a lifting device and which can be vertically lowered into and removed from the roll stand, whereby the bearing chocks of the vertical roller set can be hitched to the frame cage or also guided therein, and the bearing chocks of the lower horizontal roller can be hitched vertically displaceably to the bearing chocks of the vertical roller set. With this design, all roller sets with their bearing chocks can be brought in or out of the roll stand together when the frame cage is inserted or removed.

The outer boundary walls of the frame cage and the guide surfaces of the uprights which guide the bearing chocks of the vertical roller set can each lie in one plane according to the invention and, on inward-facing heels of the uprights, merge into guide surfaces for the bearing chocks of the lower horizontal roller, the upward-facing surfaces of the heels slideways for the horizontal movement of the bearing chocks of the vertical rollers.

The frame cage can be locked by means of adjusting bolts that can be inserted into the fixing bores with the stand bars of the roller stand halves.

A particularly advantageous embodiment is obtained when the bearing chocks of the vertical roller set are drawer-guided in the boundary walls of the frame cage when the bearing chocks of the upper horizontal roller and the bearing chocks of the vertical roller set are guided, and the suspension-coupled bearing chocks of the lower horizontal roller are guided on the guide surfaces of the stator surfaces . This design, which is particularly advantageous when using vertical roller sets with a smaller diameter, allows the stand windows to be made narrower in the foot region of the stand spars, which is particularly stressed during rolling operation, since the bearing chocks of the lower horizontal roller are guided directly on the guide surfaces of the stand spars.

If, as the invention further provides, on the stator spars of both roller stand halves, which can be coupled with the frame cage, position-adjustable and fixable lifting devices are arranged, then the rollers of the vertical roller set can also be positioned vertically changed, with the result that, for example, after changing the roller set the entire universal stand does not have to be adjusted in height to adjust it to the rolling line, and that position adjustments of the vertical rolls between the individual roll passes can also be carried out in order to achieve greater web center accuracy, so that the rolling stock is in the most horizontal position possible to achieve this goal enters the roll gap. This has the further advantage that the so-called rocking roller tables previously arranged in front of and behind the roll stand can be dispensed with. The lifting devices can be expediently arranged in pairs on adjacent stator bars of both roller stand halves and driven together.

Further forms of training of the invention are laid down in additional subclaims.

Fig. 1

ein Universalgerüst, von der Seite gesehen, teilweise geschnitten,

Fig. 2

den Rahmenkäfig mit den Horizontal- und Vertikalwalzensätzen, teilweise geschnitten, in Walzrichtung gesehen,

Fig. 3

den Rahmenkäfig mit den Horizontal- und Vertikalwalzensätzen abgesetzt auf dem Absetzrahmen von der Seite gesehen,

Fig. 4

die Seitenansicht von Fig. 3,

Fig. 5

eine andere Ausbildungsform eines Universalgerüstes mit Rahmenkäfig von der Seite gesehen in schematischer Darstellung,

Fig. 6

die Seitenansicht von Fig. 5 und

Fig. 7

die Draufsicht auf Fig. 6.

The invention is explained in more detail using the exemplary embodiments shown in the drawing. Show in the drawing

Fig. 1

a universal scaffold, seen from the side, partially cut,

Fig. 2

the frame cage with the horizontal and vertical roller sets, partially cut, viewed in the rolling direction,

Fig. 3

seen the frame cage with the horizontal and vertical roller sets on the setting frame from the side,

Fig. 4

the side view of Fig. 3,

Fig. 5

another embodiment of a universal scaffold with frame cage seen from the side in a schematic representation,

Fig. 6

the side view of Fig. 5 and

Fig. 7

the top view of FIG. 6.

1 shows a universal roll stand cut in different planes normal to the axes of the horizontal rolls. Thereafter, the uprights 1 of the scaffold are penetrated by four tie rods 2 mounted therein, each of which can be driven in rotation by means of a power-operated worm 3 which engages in a worm wheel 4 provided on the tie rod 2. At both ends, the tie rods 2 pass into threaded spindles 5, which engage in pressure nuts 6, the recesses of an upper and a lower Crossbar 7, 8 are provided. While the lower pressure nuts 6 are inserted directly into the lower crossmember 8, the upper pressure nuts 6 are each arranged in coupling bushes 9 which, like the lower pressure nuts, are supported on the uprights 1. The upper cross members 7 are pivotally arranged, not shown in the drawing, coupling bushes, while in the opposite end of the upper cross members 7 recesses 7a are provided, which engage with a step of the coupling bushes 9 with corresponding steps, but on the other hand end freely so that the upper cross members 7 pivotable by approximately 90 ° with one swivel release the space formed over the housing windows 10 formed by the column bars 1. The housing window 10 have lower flanks 11, the inside width of which is adapted to the width of the bearing chocks 13 of the lower horizontal roller 14. The flanks 12 of the housing window 10 adjoining shoulders have an enlarged clear width, which enables direct guidance of the bearing chocks 15 of the vertical rollers 16. In addition, the bearing chocks 17 of the upper horizontal roller 18 are provided; they are guided vertically between boundary walls 22, which are jointly connected by means of a yoke 21 to the frame cage 19, which can be raised or lowered by means of a lifting eye 20 by a lifting device which is cast onto the yoke 21 connecting the boundary walls 22.

The yoke 21 or the boundary walls 22 are connected to a lateral adjustment bar 23, which limits and positions the introduction of the boundary walls 22 into the housing window 10. In order to secure a fixed position of the frame cage 19 in the roll stand, its yoke 21 and / or the boundary walls 22 are provided with fixing bores 24 (cf. FIG. 2), in the (not shown) on the uprights 1 guided fixing bolt can be inserted. The boundary walls 22 are thus supported on the one hand against the flanks 12 of the housing window 10 and, on the other hand, with their inner surfaces, expediently secured against axial displacements, they guide the bearing chocks 17 of the upper horizontal rollers 18 in the vertical direction. Their downward-facing boundary surfaces guide the bearing chocks 15 of the vertical rollers 16 in the horizontal direction and support them against vertical displacements, so that the horizontal guidance, with only a tight play allowing vertical guidance, without the incorporation of separate recesses into the flanks of the housing window 10, is also possible becomes like a simple removal of the bearing chocks 15 upwards, without prior horizontal displacement of these bearing chocks 15 with the vertical rollers 16.

The boundary walls 22 are each provided with support grooves 25 in the lower region of their inner surfaces, into which horizontally projecting supporting springs 26 engage, which are attached to the top of the bearing chocks 15 of the vertical rollers 16. In a similar way, undercut retaining grooves 27 are provided on the underside of the bearing chocks 15 of these vertical rollers 16, into which the angled ends of lifting eyes 29 can be hung. These lifting eyes 29 in turn encompass (see FIG. 2) lugs 30 of the bearing chocks 13 of the lower horizontal roller 14. The side legs 29a of the lifting lugs 29 are overlapped here (see FIG. 2 bottom right) by wear plates 30a of the lugs 30 of the mounting chocks 13, while a web 29b, which closes the eyebolts 29 downward, engages under the lugs 30 at a distance so as not to obstruct the adjustment path of the lower horizontal roller 14 during operation, the lower webs 29b of the eyebolt 29 are at their attachment 30 facing side formed prismatic and for lifting the rollers 14 engage in correspondingly shaped grooves 30b of the lugs 30.

To change the roll, it is now only necessary to pivot the two upper crossbars 7 and 8 outwards by 90 ° in order to expose the upper opening between the uprights 1. After loosening the fixing bolts, the frame cage 19 can then be lifted out of the upright 1 by a simple lifting operation in the vertical direction by means of a lifting device engaging the lifting eye 29. Unless special projections are provided, the bearing chocks 17 of the upper horizontal roller 18 lie on the bearing chocks 15 of the vertical roller 16 and both are supported by the support springs 26 of the chocks 15 of the vertical rollers 16 which engage in the support grooves 25 of the boundary walls 22 dug out. The lifting of the bearing chocks 15 is followed by the eyebolts 29 suspended in these, and after their webs 29b have placed in the grooves 30b of the lugs 30 of the chocks 13 of the upper horizontal roller 14, these together with the lower horizontal roller 14 and both sets of rollers, the horizontal rollers 18, 14 and the vertical rollers 16 are lifted together in a single operation.

To process these roller sets and their further disassembly, a setting frame 31 (FIGS. 3 and 4) is provided on which both roller sets can be placed. In this case, the individual bearing chocks 13, 15, 17 are set down on adjustable support surfaces; adjustable support plates 32 are provided for the bearing chocks 13 of the lower horizontal roller 14, the bearing chocks 15 are received by support plates 13 arranged on both sides, and the boundary walls 22 and / or the bearing chocks 17 of the upper horizontal roller 18 are received by support plates 34. It is also possible to provide separate support plates for the boundary walls 22 and the bearing chocks 17. Furthermore, it has proven to be useful, if necessary, to design the support plates, but in particular the boundary walls, support plates to be displaceable in the direction of the axes of the horizontal rollers. For this purpose, four pressure medium cylinder units 35 are provided, which act on different designs of boundary walls or on these common rails. There is also the possibility of reversing displacements of the supports provided at different ends of the setting frame 31 by reversing drives, in particular by pinions fixedly mounted between racks.

The separate adjusting bar 23 can be dispensed with if the thickness of the boundary walls 22 and, correspondingly, the distance of the guide surface of the uprights 1, i.e. of the housing window 10 accommodating these are enlarged. In this case, the downward-facing boundary surfaces of the boundary walls 22 secure the vertical position of the frame cage 19 in the uprights 1, while the inner regions of these boundary surfaces limit the vertical movements of the bearing chocks 15 of the vertical rollers 16.

5, 6 and 7 of a universal roll stand consists of two roll stand halves which are connected to one another by cross members 42. These roll stand halves are each made up of a pair of stand bars 40 and 41, which are each connected or connectable to one another by an upper crossbar 43 and a lower crossbar 44. The bearing chocks are between the stator bars 40 and 41 of the stator bar pairs 49 and 50 of the two horizontal rollers 46 and 47 can be moved vertically up and down (FIG. 5). On both pairs of uprights 40 and 41 (FIGS. 6 and 7) are outwardly projecting lugs 51 and 52, respectively, which merge into elongated threaded spindles 51a and 52a. The bearing chocks 53 of the vertical rollers 45 are moved horizontally between these projections 51, 52. In the exemplary embodiment, the pairs of threaded spindles 51a, 52a are connected by horizontal cross beams 54 and 55, which are guided on these.

The plate-shaped boundary walls 56a of the frame cage 56 are guided with their outer surfaces between the mutually facing guide surfaces 40a and 41a of the stator beam pairs 40 and 41 of the roller stand halves. The inner surfaces of these boundary walls 56a represent guide surfaces both for the vertical positioning movement of the bearing chocks 49 of the upper horizontal roller 46 guided thereon and for the horizontal positioning movement of the bearing mounting pieces 53 of the vertical rollers 45. The adjusting movements themselves are for the upper horizontal roller 46 by a corresponding or movement of the cross-member 43 and the positioning movements of the vertical rollers 45 by horizontal movements of the horizontal cross-members 54 and 55 in a manner not belonging to the invention. The bearing chocks 53 of the vertical rollers 45 are guided (FIG. 5) in a drawer-like manner from below in the plate-shaped boundary walls 56a of the frame cage 56. The bearing chocks 50 of the lower horizontal roller 47 are connected to the bearing chocks 53 of the vertical rollers 45 in a manner similar to that described in the previous exemplary embodiment (FIGS. 1 to 4) by means of suspension eyelets 57 which can be suspended therein. A vertical movement of the lower horizontal roller 47 with their chocks 50 is effected by the lower cross members in a manner which is also not part of the invention.

The plate-shaped boundary walls 56a of the frame cage 56 (FIGS. 6 and 7) have additional lugs 58 with passage recesses 58a and flat vertical contact surfaces 58b. These contact surfaces 58b rest on likewise vertically running, flat guide surfaces 59a of lifting devices 59, which are each arranged in pairs on adjacent stator bars 40, 41 of the roller stand halves and are connected to one another in a geared manner by motors 60 driven via coupling spindles 61. Each of the lifting devices 59 has a driving pin 63 which can be axially displaced in an eccentric lifting gear 62 (FIG. 5) and which can be inserted into and removed from the respective passage recess 58 of the plate-shaped boundary walls 56a of the frame cage 56 (FIG. 5).

The piston-cylinder units 66, shown in dash-dotted lines and arranged on the stand bars 40, 41, serve to balance the cross members 43 during their adjusting movements.

As can be seen in particular from FIG. 5, the frame cage 56, as already explained in the exemplary embodiment according to FIGS. 1 to 4, can be guided on the guide surfaces 40a, 41a of the uprights 40, 41 for the purpose of removing or installing the roller sets can be lifted out of the roll stand or lowered into it. The bearing chocks 49 of the upper horizontal roller 46 rest on the bearing chocks 53 of the vertical rollers 45, and these are drawer-guided and held under the frame cage 56 from below. The bearing chocks 50 of the lower horizontal roller 47, which, as in the aforementioned embodiment according to FIGS. 1 to 4, are guided directly between the guide surfaces 40a, 41a of the uprights 40, 41, are suspended in the eyebolts 47 which are connected to the bearing chocks 53 of the vertical rollers 45 lifted out of the roll stand.

In order to change the position of the rolling line to a vertically higher position W1 or a vertically lower position W2 (FIG. 5), the driving pins 63 are inserted into the passage recesses 58a of the contact surfaces 58b of the approaches with the aid of a piston-cylinder unit 70 arranged on the eccentric lifting gear 62 58 of the plate-shaped boundary walls 56a introduced. These passage recesses 58a have the shape of horizontally extending longitudinal slots (FIG. 6). With the aid of the eccentric lifting gear 62, the driving pins 63 of all lifting devices 59 then carry out a common lifting or lowering movement, which bring the frame cage 56 and with it the vertical rollers 45 into a position in which the rolling line runs at the desired height between W1 and W2 . Subsequently, the driving pins 63, which for this purpose have slightly wedge-shaped contact surfaces, are firmly pressed into the passage recesses 58 and thus lock the frame cage 56 in the set rolling position. The two horizontal rolls 46 and 47 are then centered on the set rolling line with the aid of the crossbars 43 and 44.

Claims (9)

1. Universal stand with adjustable horizontal and vertical roll sets (18, 14; 46, 47; 16; 45) guided in window recesses of the stand posts (1; 40, 41) of the roll stands, in the form of a universal rolling mill stand with two roll stand halves, which are each formed from a pair of stand posts (1; 40, 41) with traverses (7, 8; 43, 44) and connecting by crossbeams and in which the bearing elements (17, 13; 49, 50) of the horizontal roll set (18, 14; 46, 47) are movable between the stand posts (1; 40, 41) of the respective stand post pair, and the bearing elements (15; 53) of the vertical roll set (16; 45) are movable between outwardly projecting projections of this stand post pair, vertically or horizontally and the uppermost of the traverses (7; 43) connecting the stand post pair are pivotable out horizontally or for lifting-off, and in which arranged between the outer surfaces of the bearing elements (17; 49) of at least the upper horizontal roll (18; 46) and the mutually facing guide surfaces of the stand posts (1; 40, 41) of the stand post pair is a support frame which is guided at these guide surfaces and has boundary walls (22; 56a), characterised thereby that the plate-shaped boundary walls (22, 56a) of the support frame form, for the bearing elements (17; 49) of the upper horizontal roll (18; 46) alone or for these and the bearing elements (15; 53) of the vertical roll set (16; 45), a frame cage (19; 56) which is connectible with a lifting device and which is vertically lowerable into and liftable up out of the roll stand, wherein the bearing elements (15; 53) of the vertical roll set (16; 45) are coupable in suspension at the frame cage (19; 56) or likewise guided in this and the bearing elements (13; 50) of the lower horizontal roll (14; 47) are couplable in suspension and vertically displaceable at the elements (15; 53) of the vertical roll set (16; 45).
2. Universal rolling mill stand according to claim 1, characterised thereby that the outer boundary walls (22) of the frame cage (19) and those guide surfaces of the stand posts (1) that guide the bearing elements (15) of the vertical roll set (16) respectively lie in one plane and pass over at inwardly directed projections of the stand posts (1) into guide surfaces for the bearing elements (13) of the lower horizontal roll (14), wherein the upwardly directed surfaces of the projections represent slide paths for the horizontal movement of the bearing elements (15) of the vertical rolls (16).
3. Universal stand according to claims 1 and/or 2, characterised thereby that the frame cage (19) is locatable at the stand posts (1) of the roll stand halves by means of adjusting bolts insertable into fixing bores (24).
4. Universal rolling mill stand according to claim 1, characterised thereby that on guidance of the bearing elements (49, 50) of the upper horizontal roll (46) and the bearing elements (53) of the vertical roll set (45) in the boundary walls (56a) of the frame cage (56), the bearing elements (53) of the vertical roll set (45) are guided in the manner of a drawer in the frame cage (56), and the guidance of the suspension-coupled bearing elements (50) of the lower horizontal roll (47) takes place at the guide surfaces (40a, 41a) of the stand post pairs (40, 41).
5. Universal stand according to claim 4, characterised by travel adjustable and arrestable stroke devices (59) arranged at the stand posts (40, 41) of roll stand halves and couplable with the cage frame (56).
6. Universal stand according to claim 5, characterised thereby, that the stroke devices (59) are respectively arranged in pairs at adjacent stand posts (40, 41) of both roll stand halves and are drivable in common.
7. Universal stand according to claim 6, characterised thereby that the stroke devices (59) respectively have a vertical guide surface (59b) placeable at contact surfaces (58b) of the frame cage (56) and having a passage opening for a stroke entraining element (63), which is bringable into and out of a passage recess (58a) in the contact surface of the frame cage (56).
8. Universal stand according to claim 7, characterised thereby that the stroke entraining elements (63) are constructed as axially displaceable and arrestable pins mounted in an eccentric gear (62).
9. Universal stand according to one or several of the claims 4 to 8, characterised thereby that the bearing elements (50) of the lower horizontal roll (47) are vertically displaceably suspendable in support eyes which are connectible with the bearing elements (53) of the vertical rollers (16) and which engage under them.

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