KR20040055984A - Cooling apparatus for hot billet - Google Patents

Abstract

PURPOSE: An apparatus for cooling billets is provided to enable flaws on the surface of the billets to be probed and enable the billets to be early injected into wire rod heating furnace by performing additional cooling process once more before transferring the billets to the postprocess after cooling the billets in the cooling section. CONSTITUTION: The apparatus comprises a load frame(10) installed in such a way that the load frame is moved up and down with the high temperature billets(1) being loaded on the load frame; and a cooling vessel(20) comprising a water supply pipe(22) installed at a central part of one side of the cooling vessel so that the load frame is dipped into the cooling vessel and cooled by receiving the frame load into the cooling vessel, and a drain pipe(25) installed on a lower surface of the other side of the cooling vessel, wherein the load frame comprises a plurality of crosswise beams(12), a plurality of fixed beams(13) penetratingly fixed to the crosswise beams, and fixed ends(11) formed at four corners, wherein the load frame is vertically driven by a driving screw jack(30) fixed to an outer surface part of the cooling vessel with being fixed to a lower surface of the respective fixed ends and guided by a guide rod(32) fixed to a lower surface of the fixed ends and a guide(33) fixed to an outer surface part of the cooling vessel at the same time, wherein the cooling vessel comprises an overflow pipe(21) installed on an upper part of the cooling vessel to drain overflow of cooling water generated when the billets are dipped into the cooling vessel so that the billets are cooled, and wherein a lower bottom surface(24) of the cooling vessel is inclined, and a plurality of injection nozzles(23) are installed at the cooling vessel to remove scale deposited on the bottom surface in a lower part of the cooling vessel.

Description

Cooling device of high temperature billet {COOLING APPARATUS FOR HOT BILLET}

The present invention relates to a cooling device for high temperature billets, and more particularly, by additionally performing an additional cooling process before cooling the billet produced by rolling a heated bloom in a steel slab furnace in a cooling table and then transferring it to a post process. The present invention relates to a cooling device for high temperature billets that enables surface flaw detection and enables early feeding into wire rod furnaces.

In general, as shown in Figure 1, the billet (1) produced by rolling the heated bloom in the steel piece heating furnace is deposited on the yard after being naturally air-cooled while moving by the moving table (2) on the cooling table (3) .

Such a natural air cooling process takes a long time for cooling the steel sheet billet (1) for about 1 to 2 days, and during this cooling period, reheating and rolling for pre-loading the billet (1) becomes impossible.

The reason is that production is possible only after surface flaw inspection of the cooled billet 1 is performed before the wire rod rolling.

In order to solve the problems of the natural air-cooling process as described above, partial gloss unevenness or scavenging may be achieved by shortening the yard time for surface flaw detection and water spraying on the lower surface of the billet billet to shorten the delivery time. Although the technology to reduce the amount has been disclosed in the Republic of Korea Patent Application No. 1988-51596, there is a problem that such a lower water yarn can not exhibit a sufficient cooling capacity of the desired degree, the lower water sand or natural air cooling in cooling the steel piece billet It was not possible to hit the desired delivery time alone, which could not reduce the waiting time for surface flaw detection.

Therefore, it is necessary to lower the cooling temperature to room temperature within a short time by using a cooling method having high cooling ability such as immersion cooling, and at the same time, while minimizing the area occupied by the cooling equipment due to interference of other equipment in the field work, high cooling There is an urgent need for the development of a cooling system with the capability.

In addition, in the existing cooling method, it was not possible to perform cooling for a certain time irrespective of the temperature of the material, and to detect the material and to start and terminate the cooling automatically. There is a need for cooling control techniques to initiate and terminate.

The present invention was created in view of the limitations of the prior art as described above, to solve this problem, by adopting the direct immersion cooling means installed to occupy a minimum space without interference of other equipment in the field work and at the same time transported high temperature It is an object of the present invention to provide a high temperature billet cooling apparatus capable of lowering the billet's cooling temperature to room temperature in a short time by loading a plurality of billets and depositing them directly in a cooling tank containing coolant.

It is also an object of the present invention to provide a cooling apparatus for high temperature billets, which accurately cools to a desired temperature through a cooling control method, detects billets unattended, and automatically starts and ends cooling.

1 is a schematic view showing an air-cooled cooling stand of a conventional high temperature billet,

2 is a side view of a cooling apparatus of a high temperature billet according to the present invention;

Figure 3a is a side view of the mounting table constituting the cooling device of the high temperature billet according to the present invention,

3b is a plan view and a front view of a mounting table constituting a cooling apparatus for a high temperature billet according to the present invention;

4 is an overall plan view of a cooling apparatus of a high temperature billet according to the present invention;

5 is an overall front view of a cooling apparatus of a high temperature billet according to the present invention;

Figure 6 is a comparison graph showing the cooling rate (A) and the conventional spray cooling rate (B) of the high temperature billet cooled by the cooling device of the high temperature billet according to the present invention.

♣ Explanation of symbols for main parts of drawing ♣

1 .... Billette 10 .... Loading stand

11 .... fixed stage 12 .... horizontal beam

13..Fixed beam 20 .... Cooling tank

21..Overflow pipe 22 .... Water pipe

23..Spray nozzle 25 .... Drainage pipe

30 .... Drive screw jack 33 .... Guide

40 .... support

The present invention is a loading table that is installed to be moved up and down by loading a hot billet; It provides a cooling device for a high-temperature billet, characterized in that consisting of a cooling tank having a water supply pipe installed in the central portion on one side and the drain pipe provided on the other side lower surface so as to accommodate the loading table and immersion cooling.

In addition, the mounting table constituting the present invention is characterized in that it is composed of a plurality of horizontal beams, a plurality of fixed beams and a fixed end formed in the four corners fixed through it is fixed to the lower surface of each fixed end Cooling apparatus of the high temperature billet characterized in that the guide rod is fixed to the lower surface of the fixed end and the guide fixed to the outer surface of the cooling tank while being driven up and down by a drive screw jack fixed to the outer surface of the cooling tank. To provide.

In addition, the present invention is characterized in that it comprises a support installed to be rotatable in the support fixed beam installed in the outer surface portion of the cooling tank so as to support the lower surface of each fixed end during the upward drive of the mount.

In addition, the present invention is characterized in that the cooling tank comprises an overflow pipe installed in the upper portion of the cooling tank to drain the overflow of the cooling water generated during the immersion cooling of the billet and at the same time the lower bottom surface of the cooling tank It provides a cooling device for hot billet characterized in that the lower bottom surface is formed in an inclined shape while having a descaling water supply pipe installed on the lower surface of the cooling tank to remove the scale deposited.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation of the present invention.

2 is a side view of a cooling apparatus of a high temperature billet according to the present invention.

As shown in Figure 2, the present invention is coupled to the guide rod 32 and at the same time coupled with the jack rod 31 of the drive screw jack 30 to be moved up and down by loading a plurality of billet (1) A loading table 10 which is stably guided by the guide 33; The overflow pipe 21 is installed in the upper part while having an internal space enough to accommodate the mounting table 10, and a water supply pipe 22 for supplying cooling water is installed in the center part, and a lower bottom surface inclined in the lower part. It consists of a cooling tank 20 provided with the injection nozzle 23 for discharging the scale deposited by 24.

3A to 3B, the U-shaped horizontal beam 12 is arranged in a plurality of rows so as to support a plurality of billets 1 to be stacked, and the horizontal beam 12 is arranged in a plurality of mounting tables 10. The fixed beam 13 of the penetrates and is firmly fixed.

The fixed edge 11 is formed in the four corners of the fixed horizontal beam 12 as described above so that the driving means and the guide means described later can be fixed and moved up and down.

As shown in Figures 4 and 5, the mounting table 10 is a drive screw jack installed on the outer surface of the cooling tank 20 so as to be driven up and down in the cooling tank 20 is formed larger than the inner space to be accommodated or separated. It is installed to be supported or guided by the 30 and the guide 33, the support 40.

That is, the mounting table 10 is fixed to the jack rod 31 on one side lower surface of the fixed end 11 formed in each corner, the fixed jack rod 31 is the outer portion of the cooling tank 20 Up and down is driven by the drive screw jack 30 fixed to the jack fixed beam 35 is installed.

The driving screw jack 30 is driven by the driving shafts 37a and 37b geared to the driving motor 36 fixed to the central outer surface of the cooling tank 20, respectively, the driving screw jack 30 and gears. By coupling it is possible to raise or lower the jack rod 31 fixed to the lower surface of the fixed end 11 of the mounting table (10).

The up and down driving of the mounting table 10 is a guide rod 32 fixed to the lower surface of each fixed end 11, the guide fixed to the guide fixing beam 34 installed on the outer surface of the cooling tank ( 33, it is configured to guide stably.

In addition, the support 10 is rotatably installed on the support fixed beam 42 installed on the outer surface portion of the cooling tank 20 to support the lower surface of each of the fixed end 11 when driving up. Since the mounting table 10 which is raised to the highest point is always supported by the support 40 stably.

The support 40 is installed to be rotatable by the rotary motor 41 connected to the support 40 installed to be rotatable in the support fixed beam 42 installed on the outer surface of the cooling tank 20, the mounting table 10 During the lowering action of the rotary motor 41 to drive the support 40 to the lower end of each fixed end 11 by rotating the mounting table 10 to operate downward.

Characteristic of the cooling tank 20 constituting the present invention is, as shown in Figure 2 described above, installed on the cooling tank 20 to drain the overflow of the cooling water generated during the billet (1) immersion cooling The overflow pipe 21 is provided, and the lower bottom surface of the cooling tank 20 is provided with the injection nozzle 23 on the lower surface of the cooling tank 20 so as to easily remove the scale deposited thereon. Since the surface 24 is formed in an inclined shape, the scale separated from the billet 1 and deposited on the bottom surface can be easily discharged to the drain pipe 25 of the cooling tank 20.

In addition, by attaching a load sensor such as a load shell or a sensor such as a limit switch on the upper surface of the mounting table 10 of the cooling tank 20 to detect that the billet is loaded on the mounting table, the driver manually It is possible to eliminate the need to start cooling. Also, by attaching a thermocouple or pyrometer, the cooling start temperature and the billet temperature during cooling are measured. Can be configured to terminate.

EMBODIMENT OF THE INVENTION Hereinafter, the Example of this invention is described.

EXAMPLE

In order to shorten the time required to cool down the billet of the slab billet, it has been proposed to adopt the immersion cooling method, in which case the interference with the magnetic crane (not shown) conveying the high temperature billet (1) in the cooling apparatus according to the present invention. In order to exclude, the mounting table 10 was installed to be movable up and down, so that it was possible to deliver Shanghai after a predetermined time.

In addition, in order to naturally circulate the cooling water in the cooling tank 20, an overflow pipe 21 was installed, and the coolant introduced into the water supply pipe 22 was designed to overflow.

In order to easily clean the scale deposited on the lower portion of the cooling tank 20, the bottom of the water spray nozzle 23 and the cooling tank 20 was configured to be inclined.

The following is an embodiment using the high-temperature billet cooling apparatus according to the present invention directly.

By installing the cooling device according to the present invention in a transfer path that transfers 8 bills from the cooling rod of the wire rod factory to the bogie line simultaneously with a magnetic crane, high temperature billets are installed by continuous operation. Attempt to cool.

The present invention minimizes the use of the ceiling crane in the production of materials to enable the same operation without any load in the existing operation in all operations, and after the transfer to the crane to the cooling tank 20, the cooling without the crane After immersion cooling, the billet 1 inside the cooling tank 20 was separated from the immersion water and then transported back to the crane.

Since the time interval required to load the eight billets being transferred to the magnet crane on the mounting table 10 of the cooling apparatus according to the present invention is 8 minutes, immersion cooling is performed for 5 minutes, and the remaining 3 minutes are loaded into the cooling tank 20. The up / down driving operation of the base 10 and other auxiliary work were completed.

When the billet is cooled without a crane when the billet is deposited inside the cooling tank 20, since the loaded billet may be detached and deformed, a device for preventing the detachment of the billet may be fixed to the mounting table 10. Means may also be attached.

During the continuous operation, the water temperature in the cooling tank 20 rises, causing the cooling capacity to be weakened. Thus, the water supply pipe 22 is installed to supply the cooling water for the cooling water circulation, and the drain pipe 25 is installed to drain the cooling water.

Since the amount of cooling water that can be cooled by depositing 8 billets is 50 ~ 600m ³ / hr, the cooling tank 20 is made to correspond to the amount of cooling water to simultaneously cool 8 billets of 160mm × 160mm × 10000mm size. After the digging of the bottom of the billet transfer line for the field workability and carrying out the construction work, the cooling tank 20 was installed.

6 is a comparative graph showing a cooling rate A and a conventional spray cooling rate B of a high temperature billet cooled by a cooling apparatus of a high temperature billet according to the present invention.

As shown in Figure 6 (A), by immersing and cooling the eight high temperature steel billet billet of about 700 ℃ using the cooling apparatus according to the present invention can be seen that the rapid cooling from about 300 seconds to about 100 ℃, Figure As shown in 6 (B) it can be seen that the cooling of the four high temperature steel billet billet of about 700 ℃ by the conventional spray method maintains the billet at a temperature higher than 100 ℃ even after 600 seconds to the present invention rather than the water spray cooling method It can be seen that the immersion cooling method using the cooling device has a much higher cooling capacity.

As described in detail above, the present invention is configured by installing the cooling device in the billet transfer line to reduce the time required for the cooling stand of the steel sheet billet, and provides the effect of eliminating interference of other equipment such as magnetic crane work.

In addition, by installing an overflow pipe to naturally circulate the cooling water in the cooling tank, the overflowed cooling water is recycled or drained, and the bottom of the cooling tank is made oblique and the water spray nozzle is installed to facilitate the scale scale. It also provides an effect that can be removed.

In particular, it has the effect of shortening the time required for the existing billet cooling within 1 ~ 2 days to 10 minutes.The cooling control method accurately cools to the desired temperature and detects the billet unattended to start and end the cooling. It provides the advantages.

Claims (7)

In the apparatus for cooling the hot billet rolled after heating through a steel slab heating furnace, A loading table 10 installed to stack the high-temperature billet 1 and move up and down; It characterized in that it comprises a cooling tank 20 having a water supply pipe 22 is installed in one central portion and the drain pipe 25 is installed on the other lower surface so as to accommodate the loading table 10 to immersion cooling Chiller for high temperature billets. The method of claim 1, The mounting table 10 is a plurality of horizontal beams 12, a plurality of fixed beams (13) for fixing them and a fixed end (11) formed in four corners, characterized in that the cooling device of the high temperature billet. The method of claim 2, The mounting table 10 is fixed to the lower surface of each fixed end 11 is driven up and down by a drive screw jack 30 is fixed to the outer surface of the cooling tank 20 and at the same time the fixed end 11 Cooling apparatus of the high-temperature billet, characterized in that guided by a guide rod (32) fixed to the lower surface of the guide 33 is fixed to the outer surface portion of the cooling tank (20). The method of claim 2, The mounting table 10 is configured to include a support (40) rotatably installed on the support fixed beam 42 installed on the outer surface portion of the cooling tank 20 to support the lower end of each fixed end (11) High temperature billet cooling device characterized in that. The method of claim 1, The cooling tank 20 is a high temperature billet, characterized in that it comprises an overflow pipe 21 installed on the cooling tank 20 to drain the overflow of the cooling water generated when the cooling of the billet (1) Chiller. The method of claim 1, The cooling tank 20 is a high temperature billet characterized in that the lower bottom surface 24 of the cooling tank 20 is inclined to remove the scale deposited on the lower bottom surface and a plurality of injection nozzles 23 are provided. Chiller. The method of claim 1, The loading table 10 has a load sensor installed on the upper surface to detect whether the loading according to the load of the billet (1) to send a signal for automatic control of the cooling start, the loading table (10) The thermocouple or the radiation thermometer which transmits the rising / lowering driving time control signal of the loading table 10 is installed so that the cooling temperature can be cooled to the target cooling end temperature regardless of the change in the cooling start temperature by measuring the temperature of the loaded billet. Cooling device for high temperature billets.