MXPA97008039A - Device to move the rollers in an elevated rolling station cuadruple for plate and an - Google Patents

Abstract

The present invention relates to a device for moving the rollers in a quadruple elevated rolling station for sheets and / or wide plates, the device comprising fastening means (12, 13) cooperating with the wedge (14) of the respective lower roller ( 11) or the upper roller (11a), the clamping means (12, 13) have at least one closed position, in which they make the wedge (14) solid with the axial path system (23, 24) of the ridillos (11, 11a) and an open position, in which to the rollers (11, 11a), the fastening means (12, 13) cooperating with the respective coincident seats, defined laterla to the relative wedge (14) , wherein each of the clamping means (12, 13) are respectively connected to the axial path system (23, 24) through an articulated parallelogram unit that moves on a plane, which is substantially at a right angle to the plane. Rolling plane, the parallel unit articulated achieved being composed of a pair of bars, respectively (17, 117, 18, 118), connected by pins to the front of the respective fastening means (12, 13) and associated in the rear with the trajectory system axial (23, 24) through a joint (19) with at least two axes of rotation

Description

DEVICE TO MOVE THE ROLLERS IN A QUADRUPLE ELEVATED ROLLING STATION FOR PLATE AND WIDE PLATE DESCRIPTION OF THE INVENTION This invention relates to a device for moving the rollers in a quadruple elevated rolling station for winding sheet and / or wide plate, as set out in the main claim. The device is advantageously applied in the steel field in operations to place and move rollers in roll rolling stations for winding sheet and / or wide plate. In roll rolling mills for sheet and / or wide plate, the state of the art covers the process of moving the coupled work rolls, or an individual roll, in order to uniformly distribute the localized wear, in particular in correspondence with the edge of the rolled material, and / or to vary the section geometry of the rolled product when configured rollers are used. The rollers are displaced and held in place by means of elements connected to a stretching system, which has means for fastening in a suitable manner to be associated with seats situated on the wedges of the rollers, on which the clamping means act.

The fastening means can be coupled or uncoupled from the relative seats and, therefore, from the wedges, through control systems of various types, allowing the roller to be restrained and released from the stretcher whenever necessary, as for example when the roller is removed or inserted in case of replacement or maintenance. The state of the art also knows the method by means of which the thickness of the rolled product is controlled, during rolling, by moving the rolls with respect to the rolling plane, in such a way so as to vary the distance between the rolls. This movement is carried out through mechanical or hydraulic devices with which the rolling station is equipped. The movements can occur even during the opening cycle, for example, when the product is close to entering the rolling station. Each of the two working rollers or at least one of them can therefore be subjected to movements of perpendicular movement with respect to the winding plane, while the surfaces of the wedges are in close contact with the means of relative clamping to execute the desired axial displacements. These movements, which are at right angles to the rolling plane, can cause a slip between the contact surfaces of the clamping means on the stretching device and the matching seats on the wedges, which in turn determine the friction, the which is increased according to the intensity of the axial thrusts through the work rolls. The thrusts are greater when there are defects of parallelism between the work rolls and / or their generators, since they tend to generate a reciprocal tensioning movement of the rolls. The same slip can be caused, as has been said, by the impact with the winding rollers of the front end of the rolled product as it arrives. The less precisely the thickness of the product is controlled during winding, the greater the thickness reduction programmed by the specific rolling station, and the greater the slippage. Solutions have been proposed where, during the work cycle, the rollers undergo a transverse movement (roller crossing) or where both the work rolls and the backing rolls together undergo a transverse movement (pair crossing). This gives greater flexibility to control the profile of the rolled product. The crossing of the rollers, however, causes an increase in the axial thrusts and, therefore, an increase in the frictional forces between the contact surfaces of the fastening means and those of the matching seats of the wedges. The friction forces oppose the adjustment movement of the winding rolls and cause considerable inaccuracies in the system to control the thickness of the rolled product, and consequently an increase in the tolerance margins of the thicknesses, which may exceed the limits of those accepted by the market. The friction forces also cause a considerable wear of the contact forces, where they are generated, increasing friction and reducing the efficiency of the fastening elements and, therefore, of the whole system by which the rollers move. . Applicants have designed, tested and modalized this invention to overcome the disadvantages of the prior art and to achieve additional advantages. This invention is set forth and characterized in the main claim, while the dependent claims describe variants of the idea of the main mode. The purpose of the invention is to provide a device for moving the rollers in a quadruple elevated rolling station for sheet and / or wide plate, which eliminates the problem derived from the vertical displacement of the clamping means and the matching surfaces of the wedge of roller, providing a precise adjustment of the system to control the thickness of the rolled product and a reduction of the wear on the components of the system for the movement of the same rollers. According to the invention, the system for moving the rollers has fastening means cooperating with each of the seats defined on the side of the wedge and restricted to the end of a parallelogram. The parallelogram system has other ends connected to the axial stretching unit and is articulated on a plane parallel to the direction of movement of the rollers during the stage when the thickness is controlled, ie on the plane parallel to the movement at right angles. with respect to the winding plane. According to the invention, the parallelogram levers are restricted to the stretching unit through a double rotation joint. The movements of the fastening means used in the wedge, therefore, are solidly presented with the movements of the relative roller, both when these movements are of the displacement type, and when they are of the lateral type, as for example, in the case of of crossing, and when * are at a right angle to the rolling plane. This eliminates any slips between the contact surfaces of the components of the fastening system and consequently the frictional forces, which are the main causes of wear on the components and also of the imperfect functioning of the system to control the thickness of the rolled product. The strength of the restriction between the fastening means and the wedges is further increased through pin or bracket elements or other functionally similar devices, appropriately applied to connect the two parts.

According to the invention, the system for activating / deactivating the fastening means is composed of a connecting arm connected by pins between the two clamping units acting on each of the rollers, which determines the coupling / uncoupling of the means of clamping of the clamping units. The movement of the connecting arm is determined by a jack acting on an articulation element of the same arm. According to a variant of the invention, the activation / deactivation of each of the fastening means is carried out through a jack attached to one end of the drawing unit and at the other end to the same fastening means. The attached figures are given as a non-restrictive example and show some preferred embodiments of the invention as follows: Figure 1 shows a plan view of a moving device according to the invention, applied to the lower winding roller of a winding station. Rolled horizontal quadruple elevated; Figure 2 shows the device of Figure 1 with its fastening means deactivated; Figure 3 shows the device of Figure 2 adopting a variant of the system to activate / deactivate the fastening means; Figure 4 shows a side view of the device of Figure 1 and the device corresponding to the upper roller; Figure 5 shows a front section of the devices of Figure 4, with the fastening means activated; Figure 5 shows a front section of the devices of Figure 4, with the fastening means deactivated. Referring to the accompanying drawings, the numeral 10 generally indicates the movement device for winding rolls according to the invention, in this case applied to the lower roll 11 of a horizontal four-way rolling station. The moving device 10a of the upper roller 11a has the same structure and function as the device 10 of the lower roller 11 and is composed of the same elements as presented below. The following description refers to the device 10 of the lower roller, but in any case is valid for the device 10a whose elements are marked, in the attached figures, with the same number as the corresponding element of the device 10 followed by the letter "a" . The moving device 10 comprises two units provided with fastening means, in this case, composed of two jaws 12, 13. The two jaws 12, 13 cooperate with the flanges 15, 16 of the matching shape that will be found laterally on the wedge. 14 positioned at one end of the winding roller 11. To be more exact, the jaws 12, 13 in the closed position, and, therefore, during winding, close on the flanges, respectively, 15, 16, on the wedge 14. Each of the jaws 12, 13 is restricted to a pair of bars, respectively, 17-117, 18-118, these being connected by pins at one end of the respective jaws, 12, 13. At the other end , the two pairs of bars 17-117 and 18-118 are restricted, through articulations 19 with two axes of rotation, to two plate elements, respectively 20, 120 and 21, 121 arranged vertically. According to a variant, the articulations 19 are spherical. The bars in pairs 17-117, 18-118 are arranged inclined with respect to the winding axis, so that their ideal extensions coincide substantially in correspondence with the winding axis and advantageously close to the midpoint of the roller 11. This allows a better transmission of the stretching force of the shaft without causing imbalances and asymmetries in the movement. This configuration, therefore, determines, in correspondence with each jaw 12, 13, a vertically articulated parallelogram system. The plate elements 20, 120, and 21, 121, are attached to a sliding element 22 capable of axially sliding the roller 11., and solidly connected, in correspondence with the anchor point 31, to move the system comprising at least two jacks 23,24, which are, in turn, attached to the structure 25 of the rolling rolling station. During the rolling process, the transverse and / or movement movement of the rollers is achieved by activating these jacks 23, 24. The movements of the jacks 23, 24 cause the axial travel, in one direction or another, of the sliding element 22, and this sliding element 22, through the bars 17-1 17 and 18-1 18 connected to the respective jaws 12, 13, solidly facing the flanges 15, 16 of the wedge 14, cause the relative roller 1 1 to be pulled or pushed. The axial travel also, in this case, causes the transversal inclination of the rollers, each with respect to the other. This is achieved through the configured conformation of the containment stops 32, which cooperate with the contact elements 33 on the side faces of the wedge 14. The transverse movement of the roller 1 1 is also allowed by the shaped configuration of the contact faces of the jaws 12, 13 and the flanges 15, 16 of the wedge 14. The vertical movement of the roller 1 1, with respect to the winding plane during the stage when the thickness of the rolled product is verified, is achieved through of the appropriate means, which cause the solid movement of the roller 1 1 between the jaws 12, 13 and the wedge 14, and the oscillation on a vertical plane of the bars 17-1 17, 18-1 18 restricted to the relative articulations (19) The movement of the winding roller 1 1 occurs without any relative slip between the contact faces and, therefore, without any harmful friction between the contact surfaces of the jaws 12, 13 and the respective flanges 15, 16 of the wedge 14. on which the jaws 12, 13 act. This is due to the strong restriction between the jaws 12, 13 and the relative flanges 15, 16 and the oscillatory movement of the articulated parallelogram system. In this form, the friction forces, which are derived from the impact of the product arriving against the roller 1 1, or from the surface, eliminate the defects of the same roller 1 1. According to a variant of the invention, the jaws 12, 13 have pin or bracket elements, not shown in the figures, which increase the strength of the temporary joint between the jaws 12, 13 and the respective tabs of the wedge 4. The activation / deactivation system of the jaws is composed, in this case, of a movable connection arm 26 connected by pins to one end of a jaw 13 and at the other end to the top of a triangle element. 27. The triangle element 27, in turn, is connected by pins of the other jaw 12 in the upper part and to a jack 28 in the remaining upper part.

The jack 28 is connected through a pin to the same jaw 12. During the winding procedure, and, therefore, with the jaws 12, 13 closed in the flanges 15, 16 of the wedge 14, the connecting arm movable 26 is in a substantially horizontal position (Fig. 5). In order to replace the roller 11, the entire movement device 10 is made to axially move forward the head of the jaws 12, 13, is substantially in line with the whisker elements 29. The jaws 12, 13 are decoupled from the wedge 14 acting on the jack 28, which pushes the movable connection arm 26 towards the end, which is restricted to the triangle element 27. The connection arm 26, in the movement caused by the jack 28, advances the jaw 13 to which it is connected by pins and comes into contact with the relative beater element 29 and, therefore, frees it from the flange 16 on which it is enclosed. Subsequently, while the jack 28 continues its thrust action, the same movable connection arm 26, acting as a lever on the jaw 13, pushes the jaw 12 to contact its own whip member 29 and releases it from the flange. coincident 15, on which it has been closed (Figures 2, 6). The tension of the jaws 12, 13 is achieved by bringing the jack 28 back to its initial position, causing the movable connection arm 26 to perform the reverse movement. The rotation of the jaws 12, 13 solidly towards the respective bars 17-18, 18-1 18 is possible through the joints 19, to which the bars 17-1 17, 18-1 18 are restricted. With a variant of the invention, the system for activating / deactivating the jaws 12, 13 is composed of a pair of actuating jacks 30, restricted to the sliding element 22, each of which is connected to one of the jaws 12, 13 and acts directly on it. The coordinated action of the two jacks 30 causes the dragging of the two jaws 12, 13, which then come to an active position and then are vised to the matching flanges 15, 16 or to a resting position in contact with the whisking elements. 29 (Fig. 3).

Claims (6)

1 .- A device for moving the rollers in a quadruple elevated rolling station for sheets and / or wide plates, the device comprising clamping means (12, 13) cooperating with the wedge (14) of the respective lower roller (1 1) or the upper roller (1 1 a), the holding means (12, 13) have at least one closed position, in which they make the wedge (14) solid with the axial path system (23, 24) of the rollers (11, 11) and an open position, in which the rollers (11, 11) are released, the securing means (12, 13) cooperating with the respective matching seats, laterally defined to the relative wedge (14), wherein each of the clamping means (12, 13) are respectively connected to the axial path system (23, 24) through an articulated parallelogram unit that moves on a plane, which is substantially at a right angle to the winding plane, the parallelogram unit to articulated being composed of a pair of bars, respectively (17, 17; 18, 18), connected by pins to the front part of the respective fastening means (12, 13) and associated in the rear part with the axial trajectory system (23, 24) through a joint (19) with at least two axes of rotation.

2. The movement device according to claim 1, wherein the pair of bars (17, 17, 18, 18) are disposed on respective convergent planes, which cross substantially in correspondence with the winding axis and advantageously close to the average point of the relative roller (11, 11a).

3. The movement device according to any of the preceding claims, wherein the joint (19) connects the relative bars (17, 117; 18, 118) to a sliding element (22) solidly in (31) to the system. of axial trajectory (23, 24).

4. The movement device according to any of the preceding claims, wherein the joints (19) are spherical.

5. The movement device according to any of the preceding claims, wherein the system for opening / closing the clamping means (12, 13) comprises an individual control actuator (28) acting on a movable connection arm ( 26) connected by pins to one of the fastening means (12, 13) and at the other end to a triangle element (27) connected by pins, in turn, to the other of the fastening means (12, 13) .

6. The movement device according to any of claims 1 to 4, inclusive, wherein the system for opening / closing the securing means (12, 13) comprises a respective control actuator (30) solid with the element Slider (22).