UA78573C2 - Device for influencing in controlled manner load-bearing force of pressure rollers - Google Patents

Abstract

Disclosed is a device for influencing in a controlled manner the load-bearing force of supporting rollers (SW) that rest on working rollers. The neck (WZ) of said supporting rollers (SW) which is provided with an extension (ZA) is mounted in roller bearings or sliding bearings that are disposed in a bearing-supporting housing of the rollers of a roller stand. The neck extension (ZA) is mounted in a supporting bearing. The outside of the housing (LG) of said supporting bearing is connected to the bearing-supporting housing. An intermediate housing (ZG) which is inserted in the housing (LG) of the supporting bearing cylindrically encloses the supporting bearing, is impinged upon by a piston cylinder unit (KB, SK), and can be displaced within said housing (LG) in a radial direction relative to the axis of the neck extension (ZA).

Description

Description of the invention

The invention relates to a device for controlling the influence of the applied forces of the pressure rollers, in particular 2 supporting rollers applied to the working rollers.

Rollers of this type are installed with their trunnions in sliding or rolling bearings, which are supported near the support rolls by bearing cushions installed in the frame of the rolling cages. At the same time, one or both trunnions have a ledge, which is installed in the axial support bearing, the housing of which is installed on the support housing or, respectively, on the bearing pad of the pressure roller or support roll. 70 In well-known multi-roll rolling mills, the supporting and working rolls are installed in the bearing pads, which are installed in the clearances of the rolling mill bed. At the same time, the support rolls adjoin the working rolls, which are at a distance from each other and are installed in bearings with the possibility of adjustment, which form the center of deformation, and the center of deformation can be determined and changed due to the adjustable bending of the working rolls. 19 When rolling sheets, in particular with such a large width that it is necessary to use support rolls with a long barrel length and, accordingly, with a large weight, these support rolls need balancing along their entire length, so that the influence of bending forces on the working rolls is as little as possible formation of deformation centers during rolling. The balancing of the support rolls should take place in such a way that the power flow between the support and working rolls along their entire contact length remains continuous during rolling; which takes place, in particular, with a rapid rise or fall of the rolling force, as, for example, with the reversing mode of such rolling cages. Bearings are subjected to loads as a result of repeated alternating sign loading and unloading during idling, which, when rolling bearings are used, are marked on their support rollers, and depending on the distribution of the load on individual rollers, or when sliding bearings are used, respectively, are marked on their bearing surfaces, and can lead to damage. c 29 With large wide rolling cages, it turns out that the support rolls with a correspondingly large axial length (3 , than is actually necessary, as a result of which part of the bending forces intended to affect the profile of the deformation center cannot be effectively used.

Therefore, these fluctuations in rolling forces, which appear in the rolling process already during the passage, require fast and accurate control of the balancing of the support rolls.

Problems similar to the described difficulties are obtained in the process of processing rolled tapes, in which rollers are used that feed the tape of roller pairs. The circumferential surface of the rollers located on the upper surface of the belt and below it is often damaged, because the upper rollers, after passing the end of the belt, make an intermittent downward movement in the direction of the lower rollers. in

It has already been proposed to balance the support rolls by applying bending forces to the appropriately formed trunnion of the roll, and to perceive the upward acting component of these forces by the holding traverse, which is located above the roll and parallel to it. But this design is made very high and "requires a correspondingly high bed and bed clearances." This leads to relatively high and heavy rolling C cages and, in addition, requires axial transverse elongation of the support rolls themselves. c At the heart of the invention is the task of creating a device that eliminates all the difficulties described above. Besides, he

Iz" offers, based on the known designs of trunnion bearing supports, in which the trunnions of support bearings or pressure rollers are installed in the cushions of the rolling cages or in the corresponding supporting housings of the bearings, have a shoulder of the trunnion, which rests on an axial thrust bearing, the housing of which is installed externally on the pillow of the rolling cage cages; provide for a limited axial support bearing 7 installed in the bearing housing, a cylindrical intermediate housing, which is loaded by a piston-cylinder assembly, in the housing

Ge | the bearing has the possibility of adjustable radial displacement to the axis of the trunnion ledge, and with this arrangement, thanks to the controlled displacement of the intermediate housing, together with the trunnion ledge installed in it, introduce forces and bending into the support rolls or pressure rollers. -I 20 The piston-cylinder unit, as the invention additionally provides, can consist of a radial recess located on the inner side of the cylinder in the intermediate housing wall of the bearing housing, and also of a moving, floating piston loaded with the working medium in this cylindrical recess. When improving the device with a trunnion installed in the sliding bearing, in the pillow of the support roll bearing, the sliding bearing can be formed in the form of a hydrodynamic bearing with an oil 29 film (Morgoil bearing).

GF) With the help of the described device, which is mounted in the existing bearing units of the support rolls or pressure rollers without any particular complications and high technical costs, it is possible to adjust the forces applied to the support roll or pressure rollers in a simple way, using a structurally very simple structure piston-cylinder unit and a standard device for controlling the working environment. 60 The invention is explained with the help of the implementation options shown in the drawings, which show:

Fig. 1 - the trunnion of the roll with its bearing unit in a radial section, and Fig. 2 - the trunnion of the support roll with a different design of the bearing unit in the radial section.

As can be seen in Fig. 1, the trunnion M/7 of the support roll of the ZMU, which is supported by the KI bearing. rolling on the pillow I 5 of the bearing, has a ledge 7A of the trunnion, which rests on an axial support bearing in the form of a radial bearing VA. This radial bearing KA is annularly closed by a cylindrical intermediate housing 705,

which with a radial gap is installed in the cylindrical recess of the bearing attached to the pillow and Z of the bearing and connected to it with the help of screws ZK of the housing of the Z of the bearing. The intermediate housing 20 on the side of the roll facing away from the MUL trunnion is covered with an AYU cover. A floating piston 5K is located in the radial opening KV in the wall of the bearing housing 0 limiting the intermediate housing 720. Pipeline 7Й, which supplies the working medium, of the (not shown) regulated generator of the working medium enters the radial opening of the KV below the floating piston of the ZK.

With the help of the working medium launched through the supply pipeline 71 into the radial hole KV, which loads the lower side of the ZK piston, the intermediate housing 20 and, together with it, the ledge 7A of the trunnion can 7/0 be squeezed upwards by a given amount, and thus when the central axis of the support roll of the ZMU is bent, the ZMU is achieved a corresponding change in the support surface of the descent of this support roll relative to the (not shown) working roll.

From Fig. 2 follows the representation corresponding to Fig. 1 structure, in which a C. sliding bearing in the form of a bearing with an oil film is pushed onto the trunnion M/7 of the ZMU support roll. On the cover of the AB, here to the building I! From the bearing to the additional ledge 20 of the trunnion, attached to the ledge 7A of the trunnion, the ring housing KO is pushed and connected /5 With the housing GO of the bearing. This ring housing carries a KM sealing ring for an oil film bearing.

Reference list of positions

KI - Rolling bearing

SI - Sliding bearing

And 5 - Bearing cushion in the rolling cage

UU2 - Trunnion roll

ZMU - Support roll 7А - Trunnion ledge 7О - Additional trunnion ledge

EA - Radial bearing

Go - Bearing housing and) 7 - Intermediate housing

ZK - Screw

Ar - Cover with zo EB - (Osradial) hole

ZK - (Floating) piston - 2. - Supply pipeline (of working medium)

KO - Ring body

KM - Ring sealing sleeve so and -

Claims (2)

The formula of the invention 1. A device for the controlling influence of the applied forces of pressure rollers, in particular those applied to the working "rolls of the support rolls (ZMU), resting in the bearing housing or in the bearing cushion of the rolls from the rolling cage on the rolling or sliding bearings of the trunnion (M/7), which have a ledge (2A) of the trunnion, which rests on the support bearing, the body (103) of which is installed from the outside in the bearing body of the pressure rollers or in the pillow of the bearing of the support rolls (I 5), which differs in that it is installed in housing (I 0) of the bearing, which contains an axial support bearing, a cylindrical intermediate housing (75), which can be loaded by a unit (KV, ZK) piston-cylinder, in the bearing housing has the possibility of radial -I displacement to the axis of the ledge (2A) of the trunnion. 2. The device according to claim 1, which differs in that the piston-cylinder unit (KV, ZK) consists of a co-radial, cylindrical, located on the inside of the recess (KV) in the wall limiting the intermediate housing (705) of the bearing and loaded with the working medium , which has the ability to move in this cylindrical recess (KV), a floating piston (5K). - Z. The device according to claims 1 or 2 with the trunnions of the supporting c" rolls installed in the sliding bearing in the bearing cushion, which is characterized by the fact that the sliding bearing is made in the form of a hydraulic bearing with an oil film. F) name) 60 b5