DD288989A5 - KUEHLROHR - Google Patents

Abstract

The invention relates to a cooling tube for cooling rolling stock. The invention is used in wire and fine steel rolling mills. The aim and object of the invention is to increase the efficiency of cooling tubes and to expand their application, pressure losses should be avoided and the risk of Lufteinschnueffelns should be eliminated. According to the invention this is achieved by an adjustable double annular gap. FIG {Kuehlrohr; Rolling material; Wire; Fine steel; Pressure loss; Inner cone}

Description

For this 1 page drawing

Field of application of the invention

The invention relates to a cooling tube for cooling rolled material. Accordingly, the invention is applied in wire and fine steel rolling mills.

Characteristic of the known state of the art A well-proven, working in the DC flow cooling tube with inserts to increase the turbulence and thus the Heat transport is described in DD WP 250476. The flow resistance in the cooling tube are such that a Part of the cooling water opposite to the rolling direction through the cooling tube is pressed to prevent the Cooling pipe inlet air entrained and thus the heat transfer is reduced. This cooling tube has in the range of about

a sixth of the cooling tube length after the inlet several nozzle holes, which at an angle of about 10 ° to

Show cooling tube axis in rolling direction. Measurements have shown that caused by the nozzle holes high pressure losses, which is disadvantageous for

affect throughput.

Furthermore, cooling tubes are known which have conical annular gap nozzles instead of the nozzle bores mentioned and in which

In addition, the gap and thus the water velocity can be regulated by a thread (DE AS 1602356).

Such ring dowels grazing also used for stripping the cooling water (DD PS 210621). The internationally desired increase in rolling speed to more than 100 m " ¹ leads to the first-mentioned cooling tubes,

that no longer sufficient cooling water reaches the cooling pipe inlet to prevent the Lufschnschnffffeln.

Object of the invention

It is the object of the invention to increase the efficiency of cooling tubes for cooling of rolling stock and to expand the Einsatzboreich.

Explanation of the essence of the invention The invention has for its object to provide a cooling tube, in which eliminates the risk dos Elnschnüffelns of air

and pressure losses have been avoided.

According to the invention the object is achieved by the use of a conical Doopelringspaltdüse whose conical Ring gap is inclined at a mean angle of about 10 ° in Waizrichtung to the cooling tube axis, while the other conical Annular gap with a similar angle opposite to Welzrlchtung is arranged. The narrow tone splitwoombs of both

conical annular gap are independent of each other by a threaded connection between an outer cone and a

Threaded sleeve, which is firmly connected to an Innonkonus via web bubble is, or mittols other suitable. Adjustment devices, adjustable. The invention has the preemptive that unnecessary by fluidic design of the water supply unnecessary Pressure losses become vormledon. This is particularly true for dlo in view of high Walzgeschwindlgkoiton strong orhöhton Deflection losses in dor opposite to the rolling direction durchzusetzenden Kühlwassormongo in the case of only in the rolling direction

zolgonden Ringspalto.

The independent Vorstollbarkolt both Spaltwoiten offers the possibility, the cooling tube different Walzgutdurchmessern and Walzgoschwindigkoiten optimally anzupasson so that the desired cooling is achieved. embodiment The invention will be explained in more detail below using an exemplary embodiment. The accompanying figure shows the Longitudinal section through an inventively designed cooling tube. The introduction tube 1 and the guide tube 2 are each welded to an outer cone 3,4. Both are over Thread with the threaded sleeve 5, which has a water connection piece 6, in conjunction. The connection between Threaded sleeve 5 and double inner cone 7 is realized by welded web plates 8. The two round rings 9

prevent the escape of cooling water through the threads.

In order to prevent the rolling material from escaping the annular gaps formed by the outer cones 3, 4 and the inner cone 7

"Strikes", is provided for the rolling passage cross-section in the inner cone 7 in the region of the gap exits greater than in the other of the rolling stock serving cross-sections.

The cooling tube is clamped by means of three eccentric 10 and 13 on its base 11. By loosening one of the outer ones Eccentric 10 and twisting one of the outer cones 3.4 by means of an attached to the key surfaces 12 open-end wrench

the width of the respective annular gap formed by outer cone 3, 4 and inner cone 7 can be adjusted in the range from 0 to 8 mm.

Claims (3)

claims: 1. cooling tube with DC and countercurrent part and a cooling water supply with conically adjustable annular gap nozzles for cooling of rolling stock, characterized in that an insertion tube (1) for the countercurrent part and a guide tube (2) for the DC part of the cooling tube to each outer cone (3 and 4), wherein the outer cones (3,4) in a threaded sleeve (5), which also has the cooling water connection piece (6), are rotatably mounted, and wherein the threaded sleeve (5) by one or more web plates (8) a thus fixed in position double inner cone (7) is connected. 2. Cooling tube according to claim 1, characterized in that the intended for the rolling passage cross section in the double inner cone (7) in the region of the gap exits greater than the rest of the guide space of the inner cone (7). 3. Cooling tube according to claim 1 or 2, characterized in that the introduction tube (1) and the guide tube (2) with releasable eccentrics (10) are fixed.