RU2272686C2 - Moving rolled rod cooling apparatus - Google Patents

Abstract

FIELD: rapid cooling of moving rolled pieces such as wire rods.

SUBSTANCE: apparatus includes cooling chamber and jet fluid-tightly built in said chamber. Jet includes inner sleeve with cone outer surface and outer sleeve with cone inner surface forming together annular nozzle. On cone surface of inner sleeve there are grooves inclined relative to lengthwise axis of apparatus. Cooling chamber is made of mutually joined sleeves whose inner surfaces are arranged eccentrically relative to axis of apparatus. Said sleeves are joined with possibility of rotating at keeping their mutual eccentricity rotated by angle providing formation of helix on inner surface of cooling chamber; lead angle of helix coincides with inclination angle of grooves of inner sleeve of jet. On end portion of cooling chamber there is chamber for fluidic feed of air and successively are mounted: chamber for counter-current feed of water and for counter current feed of air mutually joined by their box shaped housings. Apparatus may have housing in which cooling chamber is mounted with gap. Invention allows create wavy motion of water with rotation of water around rolled piece along the whole length of cooling chamber.

EFFECT: intensified breaking of "steam jacket" and scale, possibility for intermittent cooling of rolled rod.

2 cl, 3 dwg

Description

The invention relates to rolling production, and more specifically to devices for the surface treatment of rolled products, structurally interfaced with a rolling mill, and is intended for forced accelerated cooling of moving rolled products, for example wire, which is one of the effective means of improving the quality of rolled products. However, with rapid cooling of hot rolled products, a boundary layer of steam (“steam jacket”) occurs, which prevents further cooling of the metal.

A device for cooling a rolling rolled product is known, comprising a cooling chamber and an adjustable nozzle associated with it (ed. Certificate of the USSR No. 566643, class B 21 B 45/02, decl. 07.10.74, publ. 30.07.77) .

The cooling chamber is made of cylindrical pipes interconnected by a section containing a confuser, a diffuser and a narrow cylindrical channel between them to create a hydrodynamic resistance that impedes vaporization.

The disadvantage of this device is that in the nozzle and in the cooling chamber, the water flow (water jacket) moves with the rolled products without swirls and does not provide sufficient knock-off of the “steam jacket” and scale, that is, the rolled products are not cooled sufficiently.

It is also known a device for cooling a rolling car, containing a cooling chamber and an injector for supplying coolant to it (ed. Certificate of the USSR No. 582021, class B 21 V 45/02, decl. 01.04.76, publ. 30.11.77 g.).

The counterflow nozzle has an annular nozzle of variable cross section due to the fact that the nozzle is equipped with a nozzle whose outer cylindrical surface is eccentric to the axial channel of the device, as a result of which coolant is supplied at an angle of 30-40 ° to the axis of the cylindrical cooling chamber. The fluid flow, in contact with the chamber wall opposite in the direction of the initial flow motion, forms a wave-like motion, which contributes to the destruction of the “steam jacket” and the reduction of scale formation.

The disadvantage of this device is that the wave-like movement of the coolant damps as it passes through the cooling chamber and the cooling of the rolled products is not effective enough.

It is possible to exclude the attenuation of the wave-like movement by performing in the cylindrical cooling chamber staggered alternating staggered projections protruding staggered along its length by 1 / 4-1 / 8 of its length and forming a narrowing channel in cross sections, for example, in the form of an incomplete circle (Autosvid. USSR No. 522864, class B 21 B 45/02, decl. 02.08.76, publ. 05.12.77). However, it is practically impossible to perform such protrusions inside an extended cylindrical pipe.

The closest in technical essence is a device for cooling a rolling car, containing a cooling chamber with a hermetically sealed adjustable cooling nozzle, including an inner sleeve with a conical outer surface and an outer sleeve with an inner conical surface, forming an annular nozzle at an angle to the rolling axis (see USSR Autonomous Certificate No. 410844, class B 21 B 45/02, decl. 04/26/71, publ. 01/15/74).

The outer sleeve of the nozzle is connected to the inner sleeve and the cooling chamber by a threaded connection.

To prevent the formation of a "steam jacket" at the rental in the cooling chamber along the entire length maintain a constant adjustable pressure by creating back pressure countercurrent nozzle mounted on the other end of the cooling chamber.

A disadvantage of the known design of a device for cooling a rolling rolled product is that the degree of cooling of the rolled products is insufficient, since the “steam jacket” and scale formed at the rental are not sufficiently removed due to the fact that the counter-current nozzle is effective only at the end of the cooling chamber and at the same time water shirt does not go astray.

The objective of the present invention is to provide a device that allows to increase the degree of cooling due to the enhanced knocking down of the "steam jacket" and mill scale, as well as providing a complete discharge of water (water jacket) from the rental.

This object is achieved in that in a device for cooling a rolling rolled product containing a cooling chamber and a nozzle hermetically integrated in it, including an inner sleeve with a conical outer surface and an outer sleeve with a conical inner surface forming an annular nozzle, according to the invention, the inner nozzle sleeve is provided with grooves its conical outer surface, located at an angle to the axis, the cooling chamber is made of interconnected bushes, the inner surface of which is eccentrically filled relative to the longitudinal axis of the device and each subsequent sleeve is connected to the previous one with an eccentricity rotation by an angle that ensures the formation of a spiral on the inner surface of the cooling chamber with an elevation angle coinciding with the angle of inclination of the grooves on the nozzle inner sleeve, and the jet feed chamber is fixed air and a countercurrent water supply chamber and a countercurrent air supply chamber are connected in series, interconnected by box-shaped housings, forming knocking them respectively a zone of the water jacket and a drying zone.

The device is also provided with a housing in which a cooling chamber is installed with a gap to form a sealed cavity associated with the circulating coolant supply system.

Such a constructive implementation of the device for cooling a rolling rolled metal allows to increase the cooling efficiency of the rolled steel due to the guaranteed wave-like movement of water with its rotation around the rolled steel along the entire length of the cooling chamber, which contributes to the strong knocking down of the “steam jacket” and mill scale and, therefore, its more effective cooling. In addition, the wave-like movement of the water flow in a spiral provides an intermittent rental cooling scheme, when intensive cooling cycles (water is close to the rental) alternate with pauses (water is moved from the rental to the walls of the cooling chamber) to equalize the temperature difference across the cross section.

Installed at the end of the cooling chamber, the chamber of the jet air supply and counterflow water supply contribute to loosening the water jacket and the complete subsequent knocking (discharge) of water from the rental.

To explain the invention, a specific embodiment of the invention is provided below with reference to the accompanying drawings, in which:

figure 1 - shows a device for cooling a rolling car, a General view in section;

figure 2 is a section aa in figure 1;

figure 3 - node B in figure 1.

A device for cooling a rolling car consists of a chamber 1 for capturing (cutting off) the backflow of water; pressure chamber 2, connected to the water supply system through the pipe 3; cooling chambers 4 connected to the pressure chamber 2 by an adjustable nozzle; chamber 5 of the jet air supply mounted on the end of the cooling chamber 4; chamber 6 countercurrent water supply; chamber 7 countercurrent air supply; box-shaped housings 8 and 9, interconnecting chambers 5, 6 and 7 and respectively forming zone 8 of knocking down a water jacket and scale and zone 9 of rolling rental.

The adjustable nozzle comprises an inner sleeve 10 connected to the chamber 1 with an outer conical surface provided with grooves 11 inclined to the longitudinal axis of the device at an angle α, and an outer sleeve 12 with an inner conical surface forming an annular nozzle at an angle β to the longitudinal axis of the device.

The outer sleeve 12 is provided with an annular collar 13 located between the ends of the chamber 2 and the cooling chamber 4 and connected to the cooling chamber 4.

Camera 4 cooling consists of interconnected multiple bushings whose axes are eccentrically offset by the amount a relative to the longitudinal axis of the device, and each successive sleeve is connected to the previous rotated eccentricity at an angle, providing on the inside of the chamber 4, the cooling surface of the helix with helix angle coinciding with a slope angle α of the grooves 11 on the nozzle inner sleeve 10. The cooling chamber 4 is installed in the housing 14 with the formation of a sealed cavity associated with the circulating water supply system by the nozzles 15 and 16.

The chamber 5 of the jet air supply is made of a housing 17 with a pipe 18 connected to a pressure air supply system and a sleeve 19 with grooves 20 and holes 21 made at an angle to the longitudinal axis of the device.

The chamber 6 of the counterflow water supply is provided with a sleeve 22 with holes 23 made at an angle to the longitudinal axis of the device.

The chamber 7 is equipped with a nozzle consisting of two bushings 24 and 25 with conical surfaces forming an annular nozzle for countercurrent air supply at an angle to the longitudinal axis of the device.

The device operates as follows.

The rental passes through the chamber 1, the sleeves 10 and 12 of the adjustable nozzle in the pressure chamber 2 and enters the cooling chamber 4, where it is cooled by the water supplied from the pressure chamber 2 through the annular nozzle and the grooves 11 of the nozzle and moving in a spiral wave-like manner around the rental, reducing the possibility of formation "steam shirt" and scale.

When leaving the cooling chamber 4, the water jacket around the car is loosened with compressed air supplied from the chamber 5 through the openings 21 and the grooves 20 of the sleeve 19 for hire, which greatly facilitates knocking down water with mill scale in the zone 8 by the countercurrent of water entering through the openings 23 of the sleeve 22 from chambers 6, followed by drying of the rolled products in zone 9, with an oncoming air flow from the annular nozzle between the bushings 24 and 25 of the chamber 7.

For complete heat treatment of rolled products, several proposed devices are installed in series.

The proposed device for cooling a rolling rolled product in comparison with the known ones allows more efficient cooling of the rolled product with a complete collapse of the water jacket around it.

Claims (2)

1. A device for cooling a rolling steel, comprising a cooling chamber and a nozzle hermetically integrated into it, including an inner sleeve with a conical outer surface and an outer sleeve with a conical inner surface forming an annular nozzle, characterized in that the nozzle inner sleeve is made with grooves on its conical surface at an angle to the axis, the cooling chamber is made of interconnected bushes, the inner surface of which is mounted eccentrically relative to the longitudinal axis of the device , and each subsequent sleeve is connected to the previous one with an eccentricity rotation by an angle, which ensures the formation of a spiral on the inner surface of the cooling chamber with an elevation angle coinciding with the angle of inclination of the grooves on the nozzle inner sleeve, and an air jet chamber is fixed at the end of the cooling chamber and a chamber is installed in series countercurrent water supply and a countercurrent air supply chamber, interconnected by box-shaped housings, respectively forming a zone for knocking down a water jacket and a drying zone. 2. The device according to claim 1, characterized in that it is provided with a housing in which a cooling chamber is installed with a gap to form a sealed cavity associated with the circulating coolant supply system.

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