SU1061868A1 - Apparatus for regulating roll skew of four-high mill stand - Google Patents

Abstract

THE DEVICE OF REGULATION OF THE CLEANING ROLLS OF THE WORKING CELL QUARTO ROLLED. A mill comprising, on each pair of rolls, four hydraulic cylinders supported on a work roll roll cushion, characterized in that, in order to increase the operational reliability of the roll bearings, it further comprises four hydraulic cylinders, with the first four hydraulic cylinders supported on the work cushion and support roll, additional - on the frame and the cushion of the support roll, as well as four sensors for the axial force pick-up and four actuators of the skewing system of the pillows, one for each roll, four elements AND, ele ment OR-NOT, two elements OR, two sensors of the maximum skew of work rolls and amplifiers, while the outputs of the sensors of the axial force direction of the working rolls are connected through the elements AND and amplifiers to the systems of skewing of the support roll pillows (L); rolls through amplifiers are connected to skew pads of work rolls and through an element OR NOT, element OR, elements AND and amplifiers are connected to skew pads of support rolls, and sensors of the maximum skew of working rolls chergez element or elements and are connected to amplifiers and systems skew cushion support rollers 00 f 00

Description

The invention relates to the field of rolling production, in particular to equipment for rolling shops, and improves the design of quarto mill stands.

It is known that in the rolling process in a roll system, quarto stands inevitably have distortions. The roll skews in the horizontal plane result from the inaccuracy of manufacturing the rolls pillows and the bottom line: between the stand of the stand and the side surfaces of the support rolls and the gaps between the surfaces of the work rolls and the back rolls. Roller distortions result in axial (lateral) forces resulting from the formation of two rolls (supporting and working) of a screw pair of Cl3.

However, the axial forces acting on the bearings of the rolls cause their frequent breakdowns, shortening the life of the bearings of the support rolls, which entails unplanned handling due to failure of the bearings or overheating of the bearings, especially workers, from the transfer side of the mill. The use of other bearings designed for large axial forces is impossible due to the large dimensions of the latter. In addition, the use of such bearings does not eliminate another negative consequence of the bias of the roll axes - increased energy costs for rolling and wear of both working and supporting rolls. Thus, the elimination of the axial forces acting on the BEARINGS; possibly and most expediently by eliminating distortions of the rolls in the horizontal plane,

Closest to the invention of the technical essence and the achieved result is a pre-directed quarto stand with a device for adjusting the skew of the work rolls, containing work and support rolls mounted with support bearings in the pillows in the frame, and hydraulic cylinders installed in the pillows of the work rolls.

Crate works as follows

During the strip rolling, the cylinders smoothly change the skew angle of the upper roll relative to the lower one. With a change in the angle of the cross, a &roll; change in the shape of the roll gap, which makes it possible to adjust the shape of the strip, occurs.

The disadvantage of the known device is that it cannot be used to eliminate the axial forces acting on the roll bearings due to the lack of information about the direction and magnitude of the axial forces and the inability to control the tilting of the work rolls relative to the reference rolls. In turn, significant axial forces reduce the resistance of bearings and rolls, contribute to a decrease in the productivity of rolling mills and product quality.

The aim of the invention is to improve the operational reliability of the roll bearings.

10 This goal is achieved by the fact that the device for adjusting the bias of the rolls of the working stand, containing for each pair of rolls four cylinders, supported by

5 {pillow of the work roll, additionally contains four hydraulic cylinders, with the first four hydraulic cylinders supported on the worker’s pillow and support of the freewheel, and the additional four - on

Q base frame and pad of the support block, as well as four axial force direction sensors and four additional mechanisms of the bias of the pillows, one for each roll,

with four elements AND, the element OR-NOT, two elements OR, two sensors of the maximum skew of the work rolls and amplifiers, while the outputs of the sensors of the direction of the axial forces of the work rolls are connected through the elements AND and

0, amplifiers with skew cushions of the support rolls, and the outputs of the axial force direction sensors BcUiKOB through amplifiers are connected to the skew pads systems

5 working rolls .and through the element OR-NOT, the element OR, the elements AND and the amplifiers are connected to the skew systems of the pillows of the support rolls, and the sensors of the maximum skew of the

0 rolls through OR elements, AND elements and amplifiers are associated with skewing systems of the backup roll cushions. FIG. Figure 1 shows the layout of the roll system in the station5 with non-hydraulic cylinders for eliminating the roll skew (view from the non-driving side of the stand); in fig. 2 shows section A-A in FIG. 1 (in the plane of the axis of the upper work roll with the conventional image by the solution of its skew system); on

 FIG. 3 - section bB in FIG. 2 (in the plane of the stands of the bed on the drive side of the stand); FIG. 4 is a structural (logical) diagram of a roll skew system (common); in fig. 5 5 diagram, explaining the occurrence of axial forces and their direction in the selected direction of rolling. (For convenience, the upper pair of rolls (supporting - working) and lower (working 0 supporting) are shown separately, top view).

The working stand of the rolling mill contains work rolls 1 and 2 (upper and lower) and supporting rolls (upper and

5 lower), rolls 3 and 4, installed with support bearings in the pillows 5 and 6 (pillows of workers and rolls) in frame 7, and hydraulic cylinders 8 and 9, tipping roll 1 p. O clockwise; hydraulic cylinders 10 and 11, pumping roller 1 counterclockwise, hydro cylinders 12 and 13, rolling shaft 2 counterclockwise hydraulic cylinders 14 and 15, rolling roller 2 clockwise hydraulic cylinders 16-19, warping roller 3 together with roller 1 with responsibly against and clockwise; hydraulic cylinders 20-23, skewing swath. 4 in conjunction with roller 2, respectively, against and in the arrow direction. . All hydraulic cylinders are mounted on cushions of the support rolls. Their plungers abut against the frame (hydraulic cylinders 16-23) and into the side surface of the work rolls pillows (hydraulic cylinders 8-15). In addition, the device is equipped with axial force direction sensors 24-27 installed in the roller bearings, a set of logic elements (element 28 OR-NOT, elements 29-32 AND, 33 and 34 OR), amplifiers 35 and 36, which give the command to skewed clockwise pillows with rolls clockwise (); counterclockwise (-), respectively, systems 37-40 skew rolls, which include hydraulic pumps with electric drives and sensors 41 and 42 of the limiting pressure (only in skew systems of support pads). The device works as follows. I When npoifaTKe metal in the cage inevitably there are misalignments of the rolls relative to each other and generally of an arbitrary nature. The reversals of the rolls cause axial forces in the bearings of the rolls. The sensors 24–27 of the axial force direction each have two outputs (if there is a force directed to the right, at the output of sensor 1, at this time at the I I I 1 level there is no signal — output and vice versa). O, Sensors have an adjustable threshold of sensitivity in order to increase the reliability of the device as a whole. When the support roll is distorted relative to the working one, both in the upper pair and in the lower pair, the outputs of the sensors 24 or 27 correspond to the force direction of the sensors 24 or 27. This signal through the amplifier falls on the actuator actuator systems 39 and 40 skew work rolls (plungers of hydraulic cylinders 8 and 9 turn the work roll clockwise). In this case, the direction of the forced reversal helps to reduce the axial force, and, consequently, the axial force recorded by the sensor of the backup roll decreases until it becomes less than the sensitivity threshold of the sensor. After the axial force on the support rolls 3 and 4 is eliminated by the forced tilting of the work rolls, the electrical signals at the outputs of the sensors 24 and 27 of the axial force of the support rolls correspond to a zero level O. Cnn.al 1 at the output of a logic element 28 that performs the function OR NOT will be only when all its inputs have a signal (no signals). Element 28 gives permission for the rest of the device to operate. Signals corresponding to the direction of the axial forces on the work rolls from sensors 25 and 26, through logic elements 29-32 (performing a logical function I - the signal output is 1 if at both inputs), go to the corresponding actuators of the systems 37 and 38 rolls. Having received permission to work (from logic elements 28 and 34), sensors 25 and 26 give signals. (command) to force the skews of the pillows and rolls, therefore eliminating the relative skew between the work rolls, or skewing of the whole roll system in the horizontal plane relative to the rolling axis. In this case, the load on the sensors 24 and 27 of the reference points may again appear. Then the adjustment cycle is repeated. When practicing the signals from the sensors 24 and 27 of the support rolls, they, with the help of their skew systems 39 and 40, will be maximized within the limits of the gap between the cushions of the work rolls and the support rolls. The signal from limit pressure sensors 41 and 42, arriving at the input of logic element OR 33, is equal at the output, if at least one of the inputs through the element OR 34, which serves to eliminate the mutual outputs of elements 28 and 33, gives permission for the operation of sensors K9v 25 and 26 and for the forced skew of the whole roll system within the gap between the bed and the cushion bearing bearings. The mechanical system of the roll skew can be performed by a mechanical system, for example, using spacer wedges and individual drives thrust, working on command from the axial force direction sensors. Logical, amplifying and executive elements used may be electric, pneumatic or hydraulic. Thus, the device automatically minimizes the axial forces in the bearings of the rolls of quarto rolling stands due to the elimination of distortions of the rolls relative to each other. Fig1

-J7 FSH The economic effect is obtained by using the invention on one continuous broadband (1 mill rolling by reducing the cost of the work roll bearings without axial effort, reducing mill downtime associated with bearing breakage. General economic efficiency from the implementation of the invention is 114400 rubles per year. 2

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Claims (1)

DEVICE FOR REGULATING THE BENDING OF THE WORKING CELLS ¹ 'QUARTO''ROLLER ROLLER. STANA, containing for each steam generator four hydraulic cylinders resting on the cushion of the work roll, characterized in that, in order to increase the operational reliability of the roller bearings, it additionally contains four hydraulic cylinders, the first four hydraulic cylinders resting on the cushion of the working and backup roll, and additional - on the bed and pillow of the back-up roll, as well as four axial direction sensors and four actuators of the pillow misalignment system, one for each roll, four AND elements, an OR element -NOT, two OR elements, two sensors of the maximum skew of the work rolls and amplifiers, while the outputs of the sensors of the direction of axial effort of the work rolls are connected through the elements of I and amplifiers with the skew systems _{from the} pillows of the support rolls, and the outputs of the sensors of the direction of axial effort of the work rolls through amplifiers connected to the skew systems of the pillows of the work rolls and through an OR-NOT element, an OR element, elements AND and amplifiers are connected to the skew systems of the pillows of the support rolls, and the sensors of the maximum skew of work rolls through the elements LEE, AND gates and amplifiers are connected to the system skew pillows supporting rolls