SU820950A1 - Apparatus for redistributing axial forces acting on the bearings of tin-plate four-high stand working rolls - Google Patents

Description

(54) DEVICE FOR RE-DISTRIBUTION OF ESSEHICLE EFFORTS TO BEARINGS HYDROCATHAL CELL QUARTO WORKERS X ROLLS

mounted on the stand of the cage and across the lever system are pivotally connected to the floating cushion of the work roll and thermocouples are installed on the fixed working cushion that are in contact with the outer outer rings of the bearing and are connected to the control system of the said hydrocyliidras. axial forces are redistributed between drive and non-drive roll pads, resulting in a decrease in bearing life

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However, the distorted rolls, which are the cause of the axial forces in the cages, are not eliminated by this device, as a result of which the durability of the bearings does not reach the maximum possible, corresponding to the total absence of axial forces. . .

The purpose of the invention is to increase the contracting of the work rolls of the quarto hard-roll stand by reducing axial forces on the bearings of the fixed work roll pillows. -. This goal is achieved by the fact that in the device for redistributing axial forces on the bearings of the work rolls of the quarto hard-rolled stand containing installed on. bed frame double hydraulic cylinders. action and through the lever system are connected to the floating cushions of the work rolls, thermocouples installed in the fixed cushions of the work rolls, which are combined in thermal contact with the outer outer rings of the bearings, and connected with. The control system of hydraulic cylinders, thermocouples of the fixed cushion of one work roll is connected to the control system of the hydraulic cylinders of the floating cushion of another work roll. .

The drawing shows a schematic diagram of a device with a horizontal section of the upper work roll with a fixed bottom, the lower work roll with a floating pillow. . The proposed device consists of two thermocouples 1 and 2, which are mounted in a fixed cushion 3 of the upper work roll 4 and are in contact with the outer outer rings of the bearing 5. The thermocouple 1 is electrically connected to the indicating and control potentiometer 6, the thermocouple 2 e the same potentiometer 7. The valves 8 and 9 through the valve 10 are powered from the medium-pressure oil drain system and are connected to the cylinders of the double-acting hydraulic cylinders 11 and. 12, and valves 13 and 14 are designed to discharge oil from the cylinder chambers when reversed. Control potentiometers B and 7, valves 8 and 9, 13 and 14 form a control system for hydraulic cylinders 11 and 12. Double acting hydraulic cylinders 11 and 12 are mounted on a bed, stands 15 and are hinged to stops 16 and 17 fixed on a floating cushion 18 of the lower one. . Work roll 19. Pillow 18 is installed with a gap along the rolling line, in the opening of the pillow of the support roll 20. The device is symmetrical in the sense that it is exact. The same elements and connections are on the fixed bottom cushion; the work roll and the floating cushion of the upper work roll are not shown in the drawing) ..

The device works in the following way.

When skewed in the rolling plane (for example, due to a violation of the geometric dimensions of the cage elements) of one of the work rolls, for example, the bottom 19 relative to the other frkriKOB (working 4g and support rolls not shown in the drawing), the resulting rolls skew axial forces. The warped roller 19 is in contact with its support roller through the rolled strip and, possibly, along the edges of the barrel, if the rollers are working. bottom, with another slab roller 4. Axial forces act on the skewed roller both from the side of its support roll and from the other work roll, and these forces have the opposite direction. The contact of the skewed rolls through the cold rolled steel strip in the sense of generating power is equivalent to the contact of mutually skewed work and support rolls. As a result, on the skewed roll 19, axial forces are unloaded from axial forces. The axial forces are transmitted to the bearings of the fixed cushion 3 of the uncrowded work roll 4, resulting in an increase in the temperature of either even or odd (depending on the direction of the axial force): bearing rings 5. Let, for example .. the axial force on the roll 4 has direction stand, and, therefore, the temperature of the emf of thermocouple 1 increases. This emf produces times, the balance in the measuring part of the potentiometer b. When the bearing temperature becomes lower than the reference, the 4th 6 regulating power fulfills the signal transmission to the hydraulic cylinder control system and the control valve 8 opens and passes the hydraulic oil, medium pressure system to the lower chambers of the hydraulic cylinder 11 and 12, and the regulating valve 14 opens and releases the oil from the opposite hydraulic cylinder chambers

to reset. Similarly, valves 9 and 13 operate with a different direction of axial force. The direction of movement of the rods in hydraulic cylinders is such that the movement of the cushion 18 of the lower skewed work roll 19 within the gap between it and the cushion of the support roll 20 leads to the elimination of the skew of the roll 19. The movement of the cushion of the roll occurs to those pores until axial force disappears i.e. the temperature of the feeders will not decrease to a value corresponding to the operation of bearings without axial force.

The other part of the device, which controls the position of the upper work roll, does not work in the same way as shown in the drawing. .

Increasing the durability of the sub-types of work rolls of the Quarto cold rolling hot-rolled stand is reduced by reducing the axial force due to parallelism control by turning the work rolls by controlling the hydraulic cylinders of one work roll according to the thermocouple signals of the other. In the absence of such adjustment of roll skew, inevitable both are permanent, associated with disturbance of the geometric dimensions of the stand elements, due to wear and inaccuracies in the adjustment, and temporarily acting due to horizontal displacements of the pillows within the transshipment gaps, and hence the axial forces that reduce durability.

Claims (2)

1. Author's certificate of the USSR 577061, cl. B 21 B 31/02, 1972. 2. USSR author's certificate number 509313, cl. B 21 B 37/04, 1974. D. USSR author's certificate 5 No. 353763, cl. B 21 B 31/02, 1971. J. five L ™ 12