DE8019956U1 - Cooling tube for a cooling section for rapid cooling of wire rod or rod material - Google Patents

Description

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-A-

80/0101

description

The innovation relates to a cooling pipe according to the preamble of claim 1.

A cooling section with several cooling tubes of this type arranged one behind the other is, for example, through the DE-OS 2 558 832 became known. Due to the shape of these cooling tubes, the rolling stock is allowed to cool down quickly In this cooling section, the cooling water consumption is high and, moreover, the cooling section is relatively long. Particularly when installing in existing rolling mills is due to the limited space between the finishing stands and cooling bed, a short cooling path is advantageous.

The innovation is based on the task of significantly increasing the cooling water consumption while increasing the cooling capacity to belittle. The length of the cooling section should be able to be shortened considerably with the same cooling capacity.

The object is achieved by the characterizing features of claim 1. Advantageous embodiments of the innovation can be found in the subclaims.

By conically tapering the average cross-section on the outlet side of the cooling tubes to a diameter that 10-40%, preferably 20 to 30%, larger than the outer diameter of the rolling material, the pressure of the cooling

water, which is e.g. 4 bar in the rest of the pipe, increased to 6 to 10 bar. This pressure is enough to get the to avoid disadvantageous vapor formation for intensive cooling and thus a high heat transfer to ensure. The strong pressure increase on the outlet side of the cooling pipe is essentially due to the entrainment of the water due to the high speed of the rolling stock and the reduction in the outlet cross-section on the outlet side of the cooling pipe.

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The ratio of the inside diameter D of the cooling tube to the outside diameter d of the rolling rod should be the relationship

1.5-3- - 3 correspond.

It is also essential for the cooling ear according to the innovation that . that it is not narrowed on the inlet side. This is when the rolling stock is introduced onto the tip of the rolling stock The pressure exerted by the cooling water is so low that the rolling stock does not break out and it is switched on of the cooling water, the first section of the rolling stock can also be fully cooled before the rolling stock is introduced

U fy can, so that the material properties over the entire

p, the length of the rolled stock are the same, and no material losses

stand.

25th

Due to the conical outlet side

Execution of the cooling tube, the goods to be cooled are guided centrally, so that even cooling over the circumference of the staff is guaranteed. The well-known cooling section is required for the centric Guiding of the rolling material special guides, in the area of which the cooling section is interrupted and the cooling process suspends, so that no continuous abrupt cooling can take place.

The innovation is illustrated by exemplary embodiments based on three figures. Explained in more detail. The figures each represent, in longitudinal section, various embodiments of an innovation according to the invention The cooling tube.

The cooling tube shown in Fig. 1 consists of a rotationally symmetrical insert piece 1, a tubular one Enveloping body 2 and one on the outlet side on the insert screwed-on end piece 3. The insert piece is funnel-shaped on the inlet side 4 of the rolling stock, to ensure that the rod runs in safely. Its outside diameter decreases at the end of the -, funnel-shaped inlet side in two stages 5 and 6, whereby on the first stage of the enveloping body 2 sits and between the inside of the enveloping body 2 and the second Stage 6 a pressure equalization chamber 7 is formed for the cooling water. Lead from this pressure equalization chamber 7 Evenly distributed over the circumference rows of radial bores 8 in the interior of the insert, through which an evenly distributed water supply over a large area of the cooling pipe is guaranteed. The enveloping body contains a water supply line 9 which is in communication with the pressure equalization chamber 7.

As already mentioned, is on the outlet side of the cooling pipe an end piece 3 is screwed onto the insert 1,

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which has a ring attachment 14. On this and that first stage 5 sits the tubular enveloping body 2. By screwing on the end piece 3, it is possible to remove the parts 1, 2 and 3 to be clamped together. The ring seals 10 and 11 prevent water from escaping at the joints.

The end piece 3 has a conical taper 12 of the passage cross section for the rolling stock compared to the Insert 1 on. The average cross-section becomes

^ 10 tapers to a diameter / which in the example ^^^ wa 20% larger than the outer diameter of the rolled material

is, in the case of ribbed reinforcing steel, as the diameter of the cylindrical envelope of this steel. Through this the water pressure in the area of the end piece is 1 1/2 to 3 times the water pressure in the insert elevated.

The water can be switched on before the tip of the rolling stock reaches the cooling tube, as the inlet side of the cooling tube is designed to be open. As tests have shown, this is even possible without a funnel-shaped Formation of the inlet side. The inner cross section O of the insert 1 could thus be cylindrical up to

Front side to be continued. In addition to the strong increase in pressure in the area of the end piece 3 the conical narrowing of the passage opening also significantly reduces the passage of water reached at this point, so that compared to the known cooling tubes, the water consumption with increased cooling capacity can be reduced to less than half.

The second embodiment of the invention according to FIG. 2 differs from the first essentially in that that the conical taper 12 is not in a separate

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End piece 3 but in the end section 3 ^{1 of} the insert 1 'is provided. On the end portion 3 ¹ a Peststellring 13 is screwed with an annular projection 14, can be clamped by the tubular sheath body 2 in the prescribed position on the insert 1 '.

The embodiment of FIG. 3 corresponds to that of FIG. With the exception that the locking ring with the tubular Enveloping body 2 'forms a unit.

C ¹⁰

^ The direction of the rolling stock is shown in the figures

indicated by arrows. A cooling section with such cooling tubes is particularly suitable for cooling rebar.

Claims (9)

BLUMBACH · WESER ^ BERGEN "KRAMER ZWIRNER - HOFFMANN PATENT LAWYERS IN MUNICH AND WIESBADEN Patentconsull Radedcestrafle 43 3000 Munich 60 Telephone (089) 883603/883604 Telex 05-212313 Telegrams Patenlconsull Patentconsult Sonnenberger Straße 43 6200 Wiesbaden Telephone (06121) 562943/561998 Telex 04-186237 Telegrams Palentconsull KORP-STAHL AG 80/0101 Moltkestr. 15th
7570 Baden-Baden / Cooling tube for a cooling section for rapid cooling of wire rod or rod material Protection claims |: 1. Cooling pipe for a cooling section for fast f. cooling of wire rod or rod material, i its inner diameter D on the largest part I λ-- .. its length 1.5 to 3 times larger than the outer diameter d I 5 of the rolling material and that ^{consists of} a double-walled f the hollow body with a pressurized water pipe i: closable pressure equalization chamber is built, ■ from the } 5 in the middle section of the cooling tube a multitude of I bores distributed over the circumference in the interior of the ·, 10 cooling tube opens, I characterized in that the passage cross-section ; of the cooling pipe on the outlet side up to a diameter : nich tapered, which is 10 to 40% larger than the outer diameter of the rolled material. Munich: R. Kramer Dipl.-Ing. · W. Weser Dipl.-Phys. Dr. rer. nat. · E. Hoffmann Dlpl.-Ing. Wiesbaden: P. G. Blumbach Dipl.-Ing. . P. Bergen Prof. Dr. Jur. Dipl.-Ing., Pat.-Ass., Pat.-Anw. until 1979 G. Zwirner Dipl.-Ing. Dipl.-W.-lng. 2. cooling pipe according to claim 1, characterized in that its passage cross section is conical up to a diameter on the outlet side tapered, which is 20 to 30% larger than the outer diameter of the rolling material. 3. cooling pipe according to claim 1 or 2, characterized in that it is on the inlet side with a funnel-shaped extension (4) is provided. 4. Cooling tube according to one of claims 1 to 3, characterized by a total length between 100 and 500 mm. 5. cooling pipe according to claim 4, characterized by a total length between 150 and 300 mm. 6. Cooling tube according to one of claims 1 to 5, characterized in that it consists of a rotationally symmetrical Insert (1) and an enveloping body (2) attached to form a pressure equalization chamber is that the enveloping body has a water supply line (9) to the pressure compensation chamber (7) and in the middle section of the insert (1) several radial bores (8) evenly distributed over the circumference are provided. 7. cooling pipe according to claim 6, characterized in that the middle section with radial bores (8) extending over a quarter to four fifths of the cooling tube length. 8. cooling pipe according to claim 6 or 7, characterized in that the outer diameter of the insert (1) decreases from the inlet side (4) to the outlet side of the rolling stock in two stages (5, 6) and the .hüllkörper (2) on the first stage (5) and f ~ · 10 an annular shoulder (14) in the region of the end section (3, 3 ') of the cooling tube containing the conical taper (12). 9. cooling pipe according to claim 8, characterized in that the end section (3) is an end piece screwed onto the insert piece (1) (3) is formed.