SU1733138A1 - Apparatus for axially adjusting and locking upper roll in mill cage - Google Patents

Abstract

Use: control of the axial position of the roll. SUMMARY OF THE INVENTION: The device comprises pressure plates, guide rods installed in the vertical grooves of the pillows. The grooves and rods are made in length, commensurate with the height of the pillows. 1 hp f-ly, 3 ill.

Description

The invention can be used in the engineering industry, in the manufacture of nodes rolling mills, in particular the working stands of the blooming mills.

A device for fixing the pillows of the working stand of the mill is known by means of slats attached to the beds of the cage with a multitude of bolts. The axial adjustment of the roll in the cage is carried out by pressing the pads with these bolts and slats.

The disadvantages of the known device are: the clamping strips are not evenly actuated, their durability is low; The axial adjustment of the roll requires a lot of effort and time, as it is necessary to press a large number of bolts.

It is also known a device for fixing and axial adjustment of the upper roll, adopted for the prototype, with clamping strips and wear strips, which shake the upper pillows with the help of two powerful bolts and nuts. Long wear strips

clamping plates interact with short wear guide rods of the upper pillows.

The disadvantages of the prototype are: the cushion wear rod has a length two times shorter than the height of the cushion, and the distance between the two bolts of the pressure plates designed to press the cushions is almost twice the length of the wear pins of the upper cushions; the wear rods are located in the lower part of the cushions, symmetrically with the axis of the roll and stand, and when axially adjusting the position of the roll in the stand, the upper bolt of the clamping plate is always tightened slightly more than the lower one, and the clamping plates are set with a skew. The skew of the clamping bars when the mill is in operation leads to uneven wear of the rods. During the time from reloading to reloading the rolls, the rods are wedged in shape and wedge-shaped wear of the upper part of the cushion body appears. Preload upper pillows with non-parallel attachments

VI

with so

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pressing bars on both sides of the stand and wedge wear of the rods and pads leads to seizure of the pads when the roll moves upwards, the hydraulic rebalancing force of the roll becomes insufficient and a gap forms between the heel of the pressure screw and the sling. At the task of an ingot into rolls in the pressure device of the cage, very strong axial impacts occur, which break the bearings of the rolls, the turns of the screw-pair nuts and the bronze pads. In order to avoid jamming of the pads, the effort of re-balancing the roll increases, and this leads to accelerated wear of the screw pair and the screw support. The rods have flats, but their width is small, and when the wear bars of the pressure plates change, the axial adjustment of the roll position does not rotate them and the wear bars of the pressure bars unevenly and rapidly.

The purpose of the invention is to increase the efficiency of the stand cage by reducing the wear of the rods and cushions - in a device for axially adjusting the position and fixing the upper roll in the cage of the blooming mill containing pressure plates mounted on the cage bed, the guide rods with flats, mounted in cylindrical vertical grooves of the roll cushions symmetrically with the roll and cage axis, and the means of fastening the pressure plates, the grooves and the pins of the pillows are made in a length commensurate with the height of nuts, and are provided with wear strips installed cash yskah rods with a clearance with respect to the cushion surface facing the spring slats.

Figure 1 shows the fastening of the rods and strips of wear on the top cushion, general view; 2 is a section A-A in FIG. one; on fig.Z - section bb in figure 2.

The device contains clamping strips 1 with strips 2 of wear, mounted on the bed 3 stands, guide rods

4 with flats 5, mounted in cylindrical vertical grooves 6 pillows of rolls symmetrically with axis 8, 9 of roll and cage, and means 10 for fastening clamping plates

one; the rods 4 are provided with wear bars 11 fixed to the rods with screws 12. Gap I is provided for swinging the wear bars 11 around the axes of the vertical grooves 6.

The device works as follows.

When mounting strips 11 wear on flats

5 rods 4 achieve a light hinge

It is possible to swing the strips 11 with the rods 4 around the axes of the cylindrical grooves 6, the pillows 7 and the straightness of the surface of the strips 11 to the entire height of the pillows.

When the axial adjustment of a newly loaded or working upper roll is established taking into account the temperature expansion of the roll with the help of bolts 10 and pressure bars 1, the necessary minimum clearance between the bars 2 and 11 of wear of the pressure bars and cushions. This gap across the entire height of the pillows 7 can be easily controlled with a roller with two limiting dimensions. The hinged bars 11, in the process of axial adjustment of the position of the roll in the stand, regardless of the amount of wear of the shoulder of the roll bearing, are always installed in parallel and work with the entire working surface with the bars 2 of the pressure bars 1.

The technical advantages of the considered invention in comparison with the prototype - the basic object are as follows.

The arrangement of the hinged bars for the entire height of the upper pillows allows, when axially adjusting the position of the roll in the stands, to obtain and control the necessary minimum gaps between the pressure bars and pillows and pillows over the entire height of the pillows. After axial adjustment of the roll, the clamping strips are installed parallel to the pillows and to each other, due to which jamming of the upper pillows is prevented during roller swaps. Wear of the wear strips occurs evenly over their areas, and the durability of the slats increases. Roller shifting is carried out with minimal rebalancing effort.

All these advantages provide a significant increase in the resistance of the parts of the cage pressure device. The productivity of the crimping mills is increased by increasing the durability of the parts of the pressure device of the stand.

Claims (2)

1. A device for axial adjustment of the position and fixation of the upper roll in the stands of the blooming mill, containing clamping plates mounted on the stand frame, guide rods with flips, mounted in cylindrical vertical grooves of the roll cushions symmetrically with the axis of the roll and stand, and means of fastening the clamping plates Characterized in that, in order to improve performance by reducing wear of the rods and pads, the grooves and rods of the pillows are made in a length commensurate with the height of the pillows. 2. The device according to claim 1, about tl and h and y and e with the fact that the rods are supplied with straps wear, installed on the flats of the rods with a gap relative to the surface of the pillows facing the pressure plates. Pve.2 four 6-6