SU1733141A1 - Arrangement to cool sizing rolls - Google Patents

Abstract

Use: cooling streams mill rolls of high-quality mills. SUMMARY OF THE INVENTION: The device comprises a manifold with nozzles and a cooling water supply pipe connected thereto. The collector in the place where the cooling water supply pipe is connected to it is provided with a jumper dividing it into two chambers, the area of the inlet to the upper chamber of the collector is larger than the total area of the nozzle outlets installed on the upper chamber, and the area of the inlet of cooling water to the lower chamber is less than the total the area of the outlet nozzles installed on the lower chamber, while the lower chamber is provided with an air inlet. 3 il. Yo

Description

The invention relates to rolling production, in particular, to devices for cooling gage rolls of rolling mills.

The closest to the proposed technical essence and the achieved result is a device for cooling the rolls, containing a fluid supply pipe connected to a source of compressed air, a manifold located near the surface of the rolls from the side of the rolling stock entrance, air distributor. The device is also equipped with an additional collector located at the surface of the rolls on the exit side of the rolling stock from the cage and connected to the first collector by a common pipeline, the liquid supply to which is made in its middle part, and compressed air through the air distributor in extreme parts.

The disadvantages of this device are the impossibility of making a differentiated supply of cooler around the roll circumference and the complexity of the device.

The purpose of the invention is to improve cooling conditions by adjusting the irrigation density and simplifying the device.

The goal is achieved by the fact that in a device for cooling calibrated rolling rolls containing a collector with nozzles in the shape of a roll brook and branch pipes for supplying a cooler and air,

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the collector at the point of connection of the cooler pipe is equipped with a shutter dividing it into two chambers, the first of which has an inlet area larger than the hole area of the nozzles installed in it, and an inlet area of the second chamber is less than the hole area of the nozzles installed in it, while the nozzle The coolant supply is installed in the middle part of the collector, and the air inlet connection is located in the end part of the collector.

The present invention makes it possible to regulate the density of irrigation around the roll circumference created by the liquid flowing out of the upper collector chamber (water) and significantly change the density of irrigation in the mixture of water and air flowing out of the lower collector chamber (airborne).

This effect is achieved by the fact that the liquid supplied through the cooling water inlet is divided into two streams (into the upper and lower chambers of the collector). In the lower chamber, the fluid flows under pressure through the nozzles and forms flat jets; the reflux density changes depending on the pressure of the fluid supplied through the nozzle to the collector. A mixture of water and air (water-air mixture), flowing from the lower chamber of the collector, is formed into the flow by the nozzles of the lower chamber of the collector. By varying the pressures of the supplied water and air from 0 to the maximum in the lower chamber of the collector, different irrigation densities of the cooled surface of the roll are obtained, i.e. around the circumference of the roll in the cooling zone, the required density of irrigation, which provides the required heat removal from the surface of the roll. The collectors provide a differentiated supply of a cooler with different irrigation densities around the roll circumference. The presence of the shutter makes it possible to dose the flow rate of the coolers on the chambers due to the hydraulic resistance caused by a sharp change in the flow boundaries.

The area of the inlet to the upper chamber of the collector is chosen more than the total area of the outlet openings of the nozzles installed on it, in order to maintain the constant overpressure in the nozzles of this chamber. Based on the calculation of the second volumes in the inlet and outlet openings, the speed of the outflow of a jet of fluid flowing from the nozzles increases, which ensures the stability of the liquid torch

and significantly increases irrigation density.

Making the cooling water inlet area in the lower chamber smaller than the total area of the outlet nozzles installed on it causes a change in the magnitude or direction of the velocity of the fluid in the lower collector chamber, as well as a loss of pressure during sudden expansion, which contributes to the formation of unfilled voids in the lower collector chamber and in the case of the supply of air to this chamber (pressure range for a given mode of operation), the qualitative mixing of water with air, i.e. the formation of water-air fine mixture.

1 shows a collector, a general view; figure 2 is a view of And figure 1; on fig.Z - section bb in figure 2.

The device contains a collector 1 with nozzles 2 installed on it. A manifold 3 for supplying cooling water is connected to the collector 1. At the point of connection of this nozzle, the collector is provided with a jumper 4, which divides the collector into two chambers: the top 5 and the bottom 6. The area of the inlet 7 to the upper chamber 5 of the collector is larger than the total area of the outlet nozzles 2 installed on the upper chamber 5, and the area of the inlet 8 to the lower chamber 6 is smaller than the total area of the outlet openings of the nozzles 2 mounted on the lower chamber 6. The latter is provided with an air inlet 9.

The device works as follows.

Water through the nozzle 3 for cooling water supply is directed to the collector and due to hydraulic resistance when flowing around jumper 4 it is distributed to two streams (to the upper 5 and lower 6 collector chambers). In addition, air is supplied to the lower chamber 6 through the pipe 9. As a result, cooling water is supplied through the nozzles 2 of the upper chamber 5, and through the nozzles 2 of the lower chamber 6 a water-air mixture.

The proposed device, in comparison with the known, allows significantly changing the density of irrigation of the cooled surface around the roll, changing the pressure of the fluid and air in the collector depending on the thermal loads, and regulates the flow rate of the fluid and water-air mixture during the rolling process.

Claims (1)

Invention Formula An apparatus for cooling calibrated rolls comprising a collector with nozzles in the form of a roll stream and cooler and air supply nozzles, characterized in that, in order to improve cooling conditions by adjusting the irrigation density and simplifying the device, the collector, at the connection point of the cooler nozzle, is equipped with a shutter dividing it into two chambers, of which area the inlet is larger than the area of the nozzles installed in it, and the area of the inlet of the second chamber is smaller than the area of the nozzles installed in it, while the coolant inlet pipe is installed in the middle part of the collector, and the air inlet pipe is installed in the end part of the collector. FIG. one B -h B- & 7 V 8 6 B FIG. 2 Figz