IT8320312A1 - PROCEDURE AND DEVICE FOR SUPPORTING THE CYLINDERS FOR THE REPLACEMENT OF THE OPERATING CYLINDERS IN ROLLING CAGES - Google Patents

Description

"PROCEDURE AND DEVICE FOR SUPPORTING THE CYLINDERS FOR THE REPLACEMENT OF THE OPERATING CYLINDERS IN ROLLING CAGES".

SUMMARY

When assembling? 0 and disassembling the working or operator rolls (35, 36), the cylinders must not rest on each other with the central body of the cylinder. Therefore, the lower mounting elements (34) of working rolls are equipped with support devices (1, 41) which, outside the rolling stand, ensure that the distance is maintained. To replace the cylinders with material to be laminated in the stand, the support devices (1,41) must leave the space free, for this purpose are the support devices (41) of the drive side pawls operable by stops (42)? Are the support devices (1) on the maneuvering or service side made in a complete way during the wing? initiation pins (6) housed in them and always pushed upwards by a pressure spring (5) are kept lowered and in the disassembly phase they are locked in a stop position. For this purpose in the housing (2) of the support device (1) a sleeve (4)? rotatable relative to the pin (6) when a toothed sector (13) of the sleeve (4) engages in the opening (28) of the cylinder post with a toothed rod (15). In this way the cams (19) of the pin (6) are arranged next to the ecanalturoys (18) of the sleeve (4). The pin (6) which otherwise engages in the grooves (18) by means of the cams (19) cannot? pi? ve nir pressed towards the bassp.

DESCRIPTION

The invention relates to a method and a device for supporting the operating or working rolls for replacing the rolls in rolling stands, by which the surfaces of the central body of the working rolls are kept spaced apart from each other and are support each other during the assembly and disassembly phase, by means of? their mounting elements, where the upper and lower mounting elements of the working rolls in the rolling stand can be introduced and extracted by means of bearing wheels on. rails associated with them and which provide to maintain the necessary distance? in the rolling stand.

In the assembly and disassembly of the work rolls? it is essential that the cylinders do not rest on each other with the central body of the cylinder. For this reason ? known (DE-AS 2022385) equip the lower mounting elements of the cylinders with fixed pins and place the upper mounting elements of the cylinders on top of them.

In this case ? First, the upper cylinder with its mounting elements must be raised to such an extent that the pins of the lower mounting elements completely protrude from the holes of the upper mounting elements, in which they are located during the operating phase. with its assembly elements is moved by a predetermined entity? in the direction of the rolling axis. The pins, following the axial displacement, come out of the area of the holes and are moved under a contiguous surface area. lower the upper cylinder onto the pins, after which the cylinders can be pushed out with the necessary distance between them. With this replacement device not? for? in any way it is possible to replace the rolls when the laminate strip is still in the stand, which means for continuous lamination that in case of failures the strip must be removed or left to wear out. To be able to change the work rolls even when the laminate is still in the stand or in the continuous line? the usual arrangement of two pairs of rails or runways in a cage (DE-OS 2433569).

In this case a pair of rails? destined for the upper working cylinder and the other for the lower one. The mounting elements of the cylinders are equipped with sliding rollers so that these after being placed on the rails can be pulled out. Since? the rails are applied only in the cage, where they also provide the necessary mutual distance. of the cylinders, the assembly elements are provided with fixed pins already? described above for maintaining the distance outside the rolling stand.

The lower mounting elements on the control side are instead made in such a way that they have spacer levers that can be moved by means of stops which in the working position reach under the surface of the mounting element and in the case of extraction of the cylinder after the passage of the cutout of the upright of the cylinders on the maneuver side are straightened to maintain the distance from the stops applied therein. Is it therefore understood? when a new series of cylinders is introduced, the same stops then bring the spacer levers back to the dead center.

It turns out so? It is possible to replace work rolls in continuous tandem rolling lines, however it is still absolutely necessary to move the fixed pins of the mounting elements on the maneuvering side out of the area of the opposite holes by, firstly, an axial displacement of the work roll inferior.

In addition, the holes cause a weakening of the mounting elements

The task underlying the invention? that of providing a support system for respectively spacing the rolls on the maneuvering side of the rolling stand, which, avoiding the known drawbacks, allows the working rolls to be replaced, in particular avoiding an additional axial displacement operation of the operating roll inferior.

This task is solved according to the method of the invention due to the fact that the pins of the support devices provided on the maneuvering side are directed during the rolling, with a yielding force to persist. against the upper mounting elements of the work rolls and abut against them, due to the fact that the compliance, in the operation without load, of the replacement of the rolls? can be eliminated in case of pins raised to the maximum. A device for the implementation of the procedure? characterized in that on the maneuvering side of the rolling stand on projections provided on both sides of the lower mounting element of the working roll are flanged supporting devices consisting of substantially rectangular boxes or housings with a cylindrical lower housing portion, from did that in the enclosure? supported a rotatable sleeve, which underneath the rectangular flanged part in the cylindrical housing portion has a toothed sector, and which in the sleeve? arranged a pin pushed upwards by the permanent force of a pressure spring, which pin in the region of its lower step? provided with two opposing cams, to which corresponding grooves of the sleeve are associated, and by the fact that the toothed sectors mesh with toothed rods applied in the opening of the cylinder upright and in this way move or adjust each sleeve with respect to the pin, where according to a Another embodiment of the invention, each pin penetrates a blind hole associated with it of opposing blocks screwed onto the projections of the upper mounting element of the working cylinder.

A preferred solution of the invention provides for a more? simple manufacture, that the shoulder or lower step of the pin is equipped with a thread and a threaded nut screwed on it has the two cams.

It is also proposed that the case be closed with lids that leave passages for the pins and that the lower cover is provided with the toothed side and is screwed onto the sleeve by means of a half d? screws.

The invention provides that the compression spring is supported on one side on a protrusion of the sleeve and on the other side on a collar of the pin, where the collar, in the unloaded state and pushed upwards by the pressure spring which is under preload, does it rest against the top cover of the housing?

According to a proposal of the invention, the coupling of the toothed sector to the toothed rod allows a relative twisting of the sleeve with respect to the pin of 90 °, and according to a further embodiment of the invention the toothed rod? fixed applied in the cylinder balancing block. To maintain exactly the position of the swivel sleeve with respect to the pin, a position which, for example, could be affected by impacts,? it is envisaged according to the invention that a safety ball, stressed by a spring, engages in a notch of the sleeve when the cams of the threaded nut are on the grooves of the sleeve. This case always occurs (when the pin is flat, it does not assume any support function.

The invention is explained in detail in the drawing based on an exemplary embodiment.

Figure 1 shows a section through the support device according to the invention;

Figure 2 shows a section along the line I-I of Figure 1;

Figure 3 shows a section along the line II-II of Figure 1;

Figure 4 shows a view of the cylinders of a double duo rolling stand supported in the cutout of the upright, where the half? right of the figure indicated with "B" represents the internal part of the command side and the middle? left of the figure indicated with "A" represents the maneuvering side;

Figure 5 shows a partially sectioned top view of the maneuvering side where the half? left of the drawing indicated with "U" represents the lower working cylinder and the middle? right indicated with "0" represents the upper working cylinder.

The support device in Figure 1 is indicated as a whole? you with 1? constituted by the case 2, which? performed slightly above the dotted line L as a rectangular housing with a flanged part 3 (Figure 2). The portion 2a of the housing which is below this line? instead made of cylindrical shape (figure 3)? Fella housing 2? rotatably supported a sleeve 4 which with a collar 2b extends over the wall of the housing and houses a pin 6 subjected to the force of a compression spring 5? Housing 2? closed with an upper cover 7 and a lower cover 8, which have passage holes 9? 12 for the pin 6. The bottom cover 8, which? equipped with a toothed sector 13 *? screwed with sleeve 4 by means of screws 14? cosicch? the sleeve of which it will be? in an even more? specifies later, it rotates when the toothed sector 13 meshes with a corresponding toothed rod 15? A collar 16 of the pin 6 rests against the upper cover 7 when the compression spring 5 inserted in a recess of the sleeve 4 and resting on the projection 17 has brought the pin 6 by means of the collar up to its lowest position. high. In addition, in the lower region of the sleeve 4, two grooves 18 (Figure 2) are made by mechanical machining, to which two mutually opposite cams 19 are associated, which are preferably made on a threaded nut 22. The nut 22? it can be screwed onto the thread made in the lower shoulder 6a of the pin and, in the final screwing position, rests with the cams 19 protruding against the intermediate portion 6b of the pin. In this position the nut 22 is with the cams 19 in a radially developed groove 23, all around which? made for? mechanical rotation in the sleeve 4, so that? after twisting the sleeve 4 on the surface areas which remain next to the longitudinal grooves. nals 18, the cams 19 rest on these areas and in this way fix the pin 6. does the pin 6 not rotate together with the sleeve 4? provided a tab connection 20 with the top cover 7. To ensure the exact reciprocal position when the cams 19 are in the starting or exit position on the grooves 18, a safety ball 26 engages in position, under the pressure of a spring 29 inserted in the housing, in a notch or notch 27 of the revolving sleeve 4. '

According to Figure 4y, in the slots 28 of the upright of the cylinders of a double cage, not shown in detail, an upper and a lower supporting cylinder 32, 32a are supported in the mounting elements 29, and in the upper and lower mounting elements 33, 34, each time an upper work roll 35 and a lower work roll 36 are supported. For the disassembly of the work rolls 35, 36, the pairs of rails 37 and to the lower mounting elements 34 of the work rolls, the pairs of rails 38? The pairs of rails 38 for the lower working cylinder 36 are in this case firmly fixed in the cutout 28 of the cylinder post, while the upper pair of rails 37? consisting of a fixed median part and extremities 37a of the rails arranged orientable and articulated both on the maneuvering side and on the command side. The rotation of the rails 37a in the relative position takes place by means of hydraulic cylinders 47? which are mounted on struts 48 of the riser (Figure 5) .In the retracted position, i.e. when the cylinder plunger? returned, the extremities? 37 of the rails, which are also equipped on the maneuvering side with an additional inclined plane, rotate around the pivot point 51 and thus free up space for the movements of the assembly elements of the working rolls, determined by rolling. In order to maintain a constant distance between the central bodies of the rolls also outside the rolling stand, in the case of replacement of the rolls, the lower mounting element 34 of the working roll on the operating side I, which in Figure 4? reported on the met? left of the drawing ,? equipped with support devices 1. The command side, represented in the middle? right of the drawing of figure 4,? instead provided with pawls 41, which in the translation of the total of the work cylinders on the supporting wheels 40 collide with the stops 42 (figure 5) and are either straightened or lowered.

The maneuvering side I of the rolling stand? shown in detail in Figure 5? It is noted that the support devices 1 are flanged on the projections 43 of the lower mounting element 34 of the working cylinder by means of screws 44 (Figure 2). The toothed sectors 13 mesh with the toothed rods 15 which are applied to the balancing blocks 39 of the cylinder. working (right half of figure 5)? cosicch? can the pins 6 engage in the blind holes 46 of the blocks 45?

The replacement of the work rolls is carried out as follows:

after stopping the continuous rolling line, the gap between the rolls is first discharged, i.e. the pressure of the rolls is relieved by raising the adjusting rod or by moving the adjustment of the roll plunger to the underside. cylinder. So that? also the pins 6 under the force of the compression spring 5 arrive in their most position? high, the balancing of the working roll-backing roll is first disengaged and - in the present case - the pressure plate between the upper mounting element 29 of the backing rollers and the upper adjusting rod is removed.

There? ? necessary to obtain the disassembly space for the upper working roll 35? After which the balancing of the working roll and support roll is inserted again, where the pistons 52 of the cylinder lift the upper mounting element 29 of the cylinder and the cylinder pistons 52a lift the upper mounting member 33 of the work cylinder. Subsequently the extremities? 37a of the rails are rotated inwards and by disengaging the balancing of the work rolls (the pistons 52a of the cylinder are deactivated), the upper working cylinder 35 is lowered by means of the bearing wheels 40a of the mounting elements 33 on the upper rails 37 Parallel to that? the lower support cylinder 32 and the lower working cylinder 36 are lowered, where the lower mounting elements 34 of the working cylinder are lowered with their bearing wheels 40 onto the rails 38 fixedly installed in the rolling stand.

Work rolls 35? 36 are moved by means of a cylinder for moving the cylinder replacement device not shown in the figure. In this case the toothed sectors 13 mesh with the toothed rods 15, so that? the raised pins 6 of the support devices 1 are locked in their position since? by rotating the sleeve 4? the cams 19 of the threaded nut 22 of the pin are brought out of the area of the grooves and carried on the surfaces 24? The pin 6 can not? then more? be pushed downwards when the weight of the upper working cylinder 35 comes to rest on it, where each pin 6? driven as usual in the hole 46 of the opposite block 45. In the further extraction of the working rolls 35? 36? the spacer pawls 41 on the drive side reach the stops 42 on the operating or service side and are straightened by these. When do the work rolls 33, 36 leave the rolling stand by means of the rails 37? the upper work cylinder 35 * guided by the inclined plane of the ends? 37a of the rails, lowers on the support devices 1 respectively 41 of the lower working cylinder 36? With a series of work rolls thus constituted and displaceable, the upper working roll 33 rests with a constant distance on the lower working roll 36. The constant distance between the centers of the rolls? guaranteed during the replacement of the cylinders regardless of the diameter of the cylinders.

Once the work roll set is with the old work rolls on the roll replacement device, what can it do? be carried out as a mobile platform that can be moved transversely in front of the stand with rollers replacement trolleys, the table is moved and the new set of operating rolls previously arranged on it is brought into position in front of the rolling stand.

The series of work rolls then enters the cutout 28 of the upright, where the spacer pawls 41 of the mounting elements on the control side that arrive first in the cage are automatically overturned by the stops 42, thus freeing the space between the mounting elements. In the cage, the lower working cylinder 36 with the support wheels 40 of the mounting elements 34 runs again on the fixedly installed pair of rails 38 and the upper mounting elements 33 slide on the pair of rails 37. As soon as the toothed sectors 13 of the support devices 1 on the service side mesh with the toothed rods 15, the sleeves are rotated by 90? relatively with respect to the pins 6, whereby the locking of the support devices 1 is relaunched and the cams 19 are positioned on the grooves 18 of the sleeves 4. For the continuation. tion of the lamination are subsequently carried out the further necessary operations, such as rotation towards the outside of the ends? 37a of the rails, insertion of the balancing of the cylinders, etc., until? finally, the desired location is positioned between the rolls. During rolling and as long as they are not unloaded, the pins 6 of the supporting devices 1 are lowered onto the blind holes 46 of the blocks 45? where the cams 19 of the da

Claims (9)

R I V E N D I C A Z I O N I 1. Procedure for the replacement of the work rolls of a rolling stand, according to which the surfaces of the centered body of the work rolls are kept spaced apart and are supported against each other, during the assembly and disassembly phase , by means of their mounting elements where each time the upper and lower mounting elements of the working rolls in the rolling stand can be inserted and removed by means of bearing wheels on rails associated with them and which in the rolling stand provide for the maintenance of the necessary distance, characterized by the fact that the pins (6) of the support devices (1) provided on the maneuver or service side during rolling, are directed with a constant yielding force against the and? the upper assembly elements (33) of the work rolls and come to rest against these, and that the compliance, in the phase of operation without load of the replacement of the rolls,? it can be eliminated when the pins (6) are raised to the maximum. Support device for carrying out the method according to claim 1, characterized in that on the service side (i) of the rolling stand on protrusions (43) on both sides of the lower mounting element ( 34) of the working cylinder are flange supporting devices (1) consisting of substantially rectangular housings (2) with a cylindrical lower portion (2a) of the housing, which in the housing (2)? supported a rotatable sleeve (4), which underneath the rectangular flanged part (3) has a tooth sector? to (13) in the housing portion (2a) made cylindrical, which in the sleeve (4)? arranged a pin (6) pushed upwards by the permanent force of a compression spring (5), which pin in the lower tapping area or step (6a)? provided with two opposing cams (19), to which corresponding grooves (18) of the sleeve (4) are associated, and which the toothed sectors (13) mesh with toothed rods (15) applied in the opening (28) of the cylinder upright and in this way they adjust each sleeve (4) relative to the pins (6) ?. 3. Support device according to claim 2, characterized in that each pin (6) penetrates a corresponding blind hole (46) of blocks (45) screwed onto opposite projections (43) of the upper mounting element (33) of the working cylinder. 4 Support device according to claims 2 and 3, characterized in that the lower shoulder or step (6a) of the pin has a thread, and a screwed threaded nut (22) has the two cams (19)? Support device according to claims 2-4, characterized in that the housing (2)? closed with the lids (7, 8), which leave passage holes (9, 12) for the pins (6), and that the 00 for the lower rim (8)? provided with a toothed sector (13) and d? fixed on the sleeve (4) by means of screws (14). Support device according to claims 2-5, characterized in that the compression spring (5) rests on one side on the projection (17) of the sleeve (4) and on the other side on a collar (16) of the pin ( 6), where the collar (16) in the load-free position pushed upwards by the compression spring (5) which? subjected to preload, it rests against the top cover (7) of the housing (2). 7 Support device according to claims 2-6, characterized by a coupling between the toothed sector (13) and the toothed rod (15) which allows a relative torsion of 90? of the sleeve (4) with respect to the pin (6). 8. Support device according to claims 2-7? characterized in that the toothed rod (15)? fixed applied in the balancing block (39) of the cylinders. 9 Support device according to claims 2-8, carat? etherized by a notch 0 notch (27) of the sleeve (4)? in which a safety ball (26) is engaged in position, stressed by a spring (25) when the cams (19) of the threaded nut (22) are on the grooves (13) of the sleeve (4).