RU2203153C2 - Apparatus for radially setting rolls of rolling stand - Google Patents

Abstract

FIELD: constructions of rolling stands of rolling mills, mainly of bar rolling double-roll mills. SUBSTANCE: apparatus includes screws of screwdown mechanism arranged on cross beam of stand housing and nuts with worm rim for upper and lower rolls; rotation drive of nuts in the form of drive worm shafts. Apparatus is also provided with detachable shaft having mechanism for connection-disconnection of it and joined by its ends through worm connection unit with worm shafts of upper and lower nuts of screwdown mechanism. Screws of each pair are rigidly joined one with another. EFFECT: possibility for providing accurate mutual position of rolls due to separate or simultaneous mounting of upper and lower rolls. 5 dwg

Description

 The invention relates to the field of metal forming, and more specifically to the design of stands of rolling mills, and relates to devices for radial installation of rolls by mechanical means, mainly on high-quality double-roll mills.

 In order to keep the rolling line at a constant level on high-quality two-roll mills, the necessary distance between the rolls for rolling a given profile is established by moving the upper and lower rolls (AAKorolev. Mechanical equipment of rolling and pipe shops. Textbook for universities. 4th ed. M .: Metallurgy , 1987, p. 72).

 During irregular work, when the pressure device is used only, for example, to adjust calibers in long stands or to adjust the roll gap in continuous rolling stands, it is advisable to use a screw drive with worm gear (Equipment for long and thick plate rolling mills. Collection of scientific papers. VNIIMetmash, M ., 1989, p. 173-177).

 A device for radial installation of rolls of a rolling stand is known, comprising a pressure screw, a nut with a worm gear connected to it, a nut rotation drive in the form of a horizontal horizontal worm shaft (German application 2904754, class B 21 V 31/22, publ. 08.21.1980 g .).

 When the nut rotates from the worm shaft, the screw moves axially and radially sets the work rolls.

 To exclude the possibility of rotation of the screw by means of an intermediate cracker of square cross section, it is connected with a square cross-section pin mounted along the screw axis and rigidly fixed to the cover of the sealed housing, in which the radial installation device is located, providing separate installation of both ends of the roll.

 The disadvantage of this device is that it provides only separate adjustment of the position of the ends of the work roll, so it is impossible to synchronize the lower and upper rolls, and as a result, it is impossible to pre-configure the cage on the rolling axis. This lengthens the process of setting the stand on the rolling axis and reduces the accuracy of the rolls.

 In addition, the placement of the pressure screw and nut with its drive in a sealed housing leads to the appearance of additional joints and gaps between the cushions of the work rolls and the support cross member of the bed, which can lead to misalignment of the pressure screws and jamming of the screw in the threads of the pressure nut, reducing the reliability and durability of the device .

 Of the known devices for the radial installation of rolls of the rolling stand, the closest in technical essence is a device containing a pressure screw and a nut with a worm gear located in the cross of the stand frame, as well as a nut rotation drive in the form of a drive worm shaft (US Pat. RF 2075849, class B 21 B 31/24, published March 20, 1997).

 A disadvantage of the known design of the device for the radial installation of rolls of the rolling stand is that there is no possibility of simultaneous installation of the upper and lower rolls, and this leads to a decrease in the accuracy of the adjustment of the stand, since there is no possibility of synchronous reduction of the lower and upper rolls.

 The objective of the present invention is to provide a device that allows to increase the accuracy of setting the relative position of the rolls by allowing simultaneous or separate installation of the upper and lower rolls.

 The object is achieved in that the device for radial installation of rolls of the rolling stand, comprising pushing screws and nuts with a worm gear for the upper and lower rolls and a drive for rotating nuts in the form of drive worm shafts, is provided according to the invention with a split shaft with a mechanism connection and disconnection, connected at its ends by a conical connection with worm shafts for the upper and lower pressure nuts, while in each pair the pressure screws are rigidly interconnected.

 Such a structural embodiment of the device for radial installation of the rolls allows for simultaneous or separate radial installation due to the fact that the worm shafts, the rotating nuts of the pressure mechanisms of the upper and lower rolls are interconnected by a split shaft.

 When the split shaft is connected, the upper and lower rolls move simultaneously, and when it is disconnected, only one of the rolls (upper or lower) is moved.

 A rigid connection of the pressure screws with each other provides a change in the distance between the rolls while maintaining the parallelism of the axes of the rolls.

 All this allows to increase the accuracy of setting the relative position of the rolls.

To explain the invention, a specific embodiment of the invention is given below with reference to the accompanying drawings, in which:
figure 1 shows a two-roll mill stand, rolling mill, General view;
figure 2 - a view of figure 1;
figure 3 is a section bB in figure 1;
figure 4 is a view In figure 1;
figure 5 - section GG in figure 4.

 A device for radial installation of rolls, for example a high-grade double-roll mill, consists of two pairs of pressure screws 3 (for the upper and lower rolls) located in the inner cavity of the cross member 1 of the bed 2 and connected with a threaded connection of nuts 4. The hub 5 is rigidly connected to the nut 4, made with a worm gear 6. The rotation drive of the nuts 4 is made in the form of drive worm shafts 7 (one shaft for a pair of nuts) interacting with the worm gear 6 of the nut 4.

 The working end of the pressure screw 3 is based on pillows 8, carrying work rolls 9.

 At the outer end of the pressure screw 3, a bonk 10 is made with holes 11 in which a rod 12 is mounted, rigidly connecting a pair of pressure screws for one roll.

 The worm shafts 7, upper and lower, are interconnected by a split shaft 13 provided with a mechanism for its separation and connection. The mechanism for connecting and disconnecting the shaft 13 is made in the form of a sleeve 14 with spline thread mounted on the shaft 13 in place of the connector, and the pivoting arm 15 interacting with it.

 The split shaft 13 is connected to the worm shafts 7 by a conical connection by means of gears 16.

 The device operates as follows.

 To set the required solution of rolls of rolling stands, the nut 4 rotation drive is turned on, namely, the worm shaft 7 rotation drive. From the worm shaft 7, the rotation is transmitted through the worm shaft 6 to the hub 5 and nut 4. The nut 4, rotating, rotates the pressure screw 3 in the axial direction. In this case, the pillows 8 with the work roll are moved by the screw 3 in the vertical direction, changing the distance between the rollers 9. The rod 12, installed in the hole 11 of the bonnet 10 of a pair of pressure screws, eliminates the rotation of the screw and ensures parallelism of the axes of the rolls.

 If it is necessary to simultaneously move the upper and lower rolls, the split shaft is connected into a single unit and fixed in this position by the lever 15. When changing the position of only one roll, the shaft 13 is disconnected by moving the sleeve 14 by means of the lever 15.

 The proposed device for the radial installation of the rolls of the rolling stand in comparison with the known allows to increase the accuracy of the installation of the shafts and reduce the duration of the setup process.

Claims (1)

 A device for installing rolls of a rolling stand, comprising press screws and nuts with a worm ring for the upper and lower rolls and a drive for rotating nuts in the form of drive worm shafts, characterized in that it is provided with a detachable shaft with a mechanism for connecting and disconnecting it, connected at its ends by a conical connection with the worm shafts of the upper and lower pressure nuts, while in each pair the pressure screws are rigidly interconnected.

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