DE20308237U1 - Variable cooling system for rolling metal rolling mill has movable hoods for air cooling and with a water cooling track moved between a storage position beside the roller track and into the roller line - Google Patents

Abstract

A variable cooling system for a metal rolling mill has movable hoods (1, 2) above and below the height variable roller track (4) and with air jets to provide a cooling patterns. The air cooling pattern is controlled between side air curtains. The change to a water cooling system the hoods are removed along with a section of track and a water cooling track is moved from a storage position beside the track into the gap. The water cooling is via patterns of jets which are directed onto the rolled items from all sides.

Description

Changing device for cooling the extrusion lines between the media air and water behind the extrusion press

The invention preferably relates to a motor-driven changeover device for cooling the extruded strands between the media air and water behind the extrusion press. Extruded profiles, in particular aluminum and non-ferrous metal profiles, require a prescribed post-heat treatment after pressing in order to achieve defined microstructures in the material, so that on the one hand air cooling is carried out using blowers and on the other hand using a cooling water section behind the extrusion press.
According to the invention, it is possible to implement the technological change between the cooling requirements mentioned in a combined form in the proposed arrangement in mechanical terms, so that set-up times on the roller table of extrusion presses can be greatly shortened in this respect.

According to the known state of the art, after extrusion presses of the aforementioned type, there are ventilation hoods for air cooling that can be extended and retracted on a crane runway above the roller table of the pressed profiles, as well as cooling water sections/troughs that are placed separately near the roller table, the latter having to be brought to the level of the roller table by means of lifting gear if necessary.

In practice, the conversion turns out to be very complex and unnecessarily delays the production process.

It is therefore the object of the invention to combine an arrangement of the necessary elements for air or cooling water cooling in a functional unit in such a way that the technologically conditioned change of the cooling media can be quickly produced mechanically, independently of the available lifting equipment, whereby the integration into a roller table after an extrusion press should only require a minor adjustment in terms of construction and thus set-up times and labor costs are noticeably reduced.

According to the invention, the problem is basically solved with the features of the first protection claim.
The further development of the invention results from claims 2 to 5.

-2-Following
Additional information on the inventive solution is required.

Behind the extrusion press and at the end of a roller conveyor that is usually connected to it for the continuous transport of the manufactured pressed profiles, there is the cooling section for the pressed profiles to be removed from the roller conveyor. This cooling section, which is several meters long, can be used for air cooling on the one hand and can also be designed as a water cooling section on the other. For the purpose of air cooling, air cooling hoods are arranged above and below the roller conveyor, which can be raised and lowered, whereby those provided below can be lowered together with the roller conveyor if a change (for technological reasons) in the cooling regime is to take place in favor of the movable water cooling box. At the outlet of the air cooling hoods, which can be moved towards and away from the roller conveyor at the top and bottom, there are side air nozzles for coating the profile webs and an elongated air outlet directed frontally at the upper and lower belt of a pressed profile. The air cooling hood provided above the end of the roller conveyor can also be raised and lowered and can be moved sideways away from the roller conveyor. When the ventilation hoods are used, which are positioned above and below the roller table, the cooling section for the water cooling, which has a length analogous to the air cooling section, is placed to the side of it - but can be moved mechanically in the direction of the roller table, i.e. transversely to it - on a set-down table.

If water cooling is required, the water cooling box can be moved by motor from the set-down table into the area of the roller table section that can be raised and lowered, which is then lowered and thus creates the space required for the water cooling box, with transport rollers integrated into it bridging the "missing" roller table section. The special design of the movable water cooling box not only has a statically usable cooling section in the form of cooling water that has been introduced once and which may have to be constantly circulated and cooled, but also water jet nozzles arranged in the transverse direction at the beginning and end, as well as lateral water nozzles arranged along its entire length on the long sides - above the transport roller height - which are each inserted in a feed pipe that can be loaded and are directed towards the middle of the water cooling box. The pairs of water jets at the top and bottom at the beginning and end of the movable

The larger diameter feed pipes attached to the side of the water cooling box also have water nozzles that exert their effect towards the middle (inwards) of the water cooling box. The feed pipes located above the water surface at the beginning and end of the water cooling box can be designed to be pivotable.

The swivelling ability of these feed pipes has the advantage that a profile extraction device can pass through the water cooling system as well as the air cooling system without having to move the water cooling box out of the roller table.

The invention will be explained in more detail below using an embodiment.
The individual figures show:

Figure 1: Side view of the arrangement according to the invention with retracted water cooling box

Figure 2: Front view of the arrangement - air cooling
Figure 3: Front view of the arrangement - water cooling

The reference symbols used are:

1 - Air cooling hood above 2- Air cooling hood below 3- mobile water cooler 4- Raisable and lowerable roller table section 5- Water nozzle on the side 6- Water nozzle below 7- Air nozzle below 8th- swiveling water nozzle above 9- Cooling air flow 10- Settling table 11- Water wave 12- Air nozzle above 13- Air outlet ··· φφφφ &phgr;&phgr;&phgr;&phgr;&phgr;&phgr;
• J ··· φφφ φ φ φ φφ

Behind an extrusion press for, for example, extruded aluminum profiles, there is a roller table section 4 that can be raised and lowered for their transport, the dimensions of the combined air/water cooling section integrated at this point.

When air cooling with moving air is technologically necessary, the raising and lowering roller table section 4 is in the upper position according to Figure 2, with the top and bottom air cooling hoods 1, 2 being guided up to the raising and lowering roller table section 4, with the cooling air flow 9 being directed directly at the belts and web of a pressed profile. By means of air nozzles projecting laterally beyond the air outlets 13 at the bottom and top 7, 12, arranged on the air cooling hoods at the top and bottom 1, 2, the two web sides can be evenly exposed via outlet openings directed inwards towards the profile web (not shown in more detail here). The air outlets 13 of the air cooling hoods at the top and bottom 1, 2 are directed frontally towards the top and bottom belts of the pressed profile.

If appropriate water cooling is provided, the raising and lowering roller table section 4 is lowered together with the lower air cooling hood 2, and the upper air cooling hood 1 is also moved out of the working area so that the necessary space is provided for the water cooling box 3 which can be moved laterally from the set-down table 10.
In addition to the usual design for maintaining a certain cooling water level and the transport rollers located therein for bridging the "interrupted" roller table, the water cooling box 3 has water nozzles arranged at several locations for the targeted cooling of the pressed profile in moving water.
Firstly, on the long sides of the movable water cooling box 3 there are supply pipes with lateral water nozzles 5 inside it, which work in the direction of the extruded profile web with the effect that the steam formation on the extruded profile is reduced with the aim of a shorter, more intensive cooling effect.

By means of the water nozzles 6 at the bottom and the pivoting water nozzles 8 at the top, which are arranged in pairs at the ends of the movable water cooling box 3, it is advantageously possible to slightly raise the water level in the movable water cooling box 3 above what is technically possible and, together with the water nozzles 5 at the sides, to generate the water wave 11 of moving water.

By means of the pivoting ability of the water nozzles above 8, a profile extraction device can be changed quickly if necessary by both the water cooling and the air cooling device.

Claims (5)

1. Changing device for cooling the pressed strands between the media air and water behind the extrusion press, characterized in that a roller table section ( 4 ) that can be raised and lowered with air cooling hoods above and below that can be moved towards or away at the top and bottom ( 1 , 2 ) is arranged in the roller table for the pressed profile transport, and in accordance with changing technological requirements a movable water cooling box ( 3 ) can be moved mechanically from a set-down table ( 10 ) laterally into the area of the roller table section that can be raised and lowered ( 4 ) when the latter is in the lowered position. 2. Changing device for cooling the press strands according to claim 1, characterized in that the air cooling hoods at the top and bottom ( 1 , 2 ) have, in addition to the air outlets ( 13 ) directed frontally onto the profile belts, on their long sides, further extending air nozzles at the bottom and top ( 7 , 12 ) which have outlet openings in the direction of the profile web to be cooled. 3. Changing device for cooling the press strands according to claim 1, characterized in that in the movable water cooling box ( 3 ) there are feed pipes on its long sides with lateral water nozzles ( 5 ) directed towards the continuous press profile, the outlet openings of which are located just above the level of the transport rollers used in the water cooling box ( 3 ). 4. Changing device for cooling the press strands according to claim 1, characterized in that at the beginning and end of the movable water cooling box ( 3 ) each arranged in pairs, the water nozzles below ( 6 ) and the pivotable water nozzles above ( 8 ) are introduced on a feed pipe. 5. Changing device for cooling the press strands according to claim 4, characterized in that by means of the pivotable water nozzles at the top ( 8 ) there is a possibility of passage of the respective profile extraction device according to the retracted air or water cooling device.