JPS6048569B2 - Nozzle header for cooling bar materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a nozzle header for cooling rod-shaped materials that continuously and uniformly cools rod-shaped steel materials having a circular cross-section, such as bamboo materials, wire rods, and round bars.

BACKGROUND ART Conventionally, bar-shaped steel materials such as bamboo materials, wire rods, and round bars have been subjected to heat treatment by heating and cooling to obtain desired properties.

These treatments must be performed continuously and uniformly under defined conditions. However, with conventional cooling means, it is extremely difficult to uniformly apply the cooling effect to such steel materials, and in many cases there is a problem that uneven cooling occurs.

In recent years, as a method that can achieve the most uniform cooling, the steel material to be cooled is surrounded concentrically by an annular header, and a slit nozzle provided in the annular header is used to inject cooling water from all around the outer surface of the steel material. However, in this device, the injection conditions were not uniform all around the nozzle due to the difference in static pressure of the cooling water accumulated in the header, resulting in continuous uneven cooling of the steel material.

The present invention was made in view of the above circumstances, and an object of the present invention is to provide a cooling device for steel materials that uniformizes cooling water injection conditions over the entire circumference of the nozzle and prevents uneven cooling of the steel materials. There are things.

Embodiments of the present invention will be described below with reference to the drawings. Frame plates 1 and 2 with circular holes punched out in the center are arranged in parallel and facing each other, and an outer ring tube 3 is fixed between both plates 1 and 2 concentrically with the punched circle, and is concentric with the outer ring tube 3. A partition ring tube 4 and an inner ring tube 5 are sequentially fixed to the frame plate 1 to form a water supply passage 6 on the outside and a nozzle chamber 7 on the inside.

A large-diameter slit ring 8 whose edge on the nozzle chamber 7 side is curved is fixed to the end edge of the partition ring cylinder 4 on the side opposite to the frame plate 1, and the large-diameter slit ring 8 and the frame plate 2 are joined in a watertight manner. In addition, a small diameter slit ring 9 with a curved edge on the nozzle chamber 7 side is fixed to the edge of the inner ring cylinder 5 on the side opposite to the frame plate 1, and the inner ring cylinder is placed between the large diameter slit ring 8 and the small diameter slit ring 9. An annular slit 10 concentric with 5 is formed. The nozzle chamber 7 is symmetrically partitioned vertically and horizontally by partition plates 11 provided radially. There is.

The flow rate regulating valve 15 is composed of a valve seat 16 provided on the partition ring tube 4 and a valve body 17 provided on the outer ring tube 3, as shown in FIG.

First, the valve seat 16 will be described.

One end of the seat tube 18 is passed through and fixed to the partition ring tube 4, and a cap 1 having a larger diameter than the seat tube 18 is attached to the other end extending into the nozzle chamber 7.
9 is attached by a plate piece 20 to constitute the valve seat 16.

Further, a mounting seat 21 is fixed to the outer ring cylinder 3, and the mounting seat 21
A casing 22 passing through the outer ring cylinder 3 is attached watertightly to the casing 22.

A screw rod 23 is rotatably screwed into the casing 22, and a truncated conical valve body 24 is provided at one other end of the screw rod 23, and the other end is made to protrude outside the casing.
7. Ru. When the screw rod 23 is rotated using an appropriate tool, the valve body 24 approaches and moves away from the seat tube 18, and the gap between the valve body 24 and the seat tube 18 changes, thereby reducing the flow rate of the cooling water passing through. Can be adjusted.

Here, the flow of cooling water is as shown by the arrow in FIG. 3, and by bending the inside of the valve seat 16,
The velocity distribution within 13 and 14 is made uniform.

Furthermore, in order to make the velocity distribution within the compartment uniform, one or more flow regulating valves 15 are provided depending on the position and shape of the compartment. The water supply passage 6 described above is connected to a water supply source (not shown) via a water supply pipe 25.

A through hole 2 concentric with the inner ring cylinder 5 is provided in the small diameter slit ring 9.
A nozzle inner wall panel 27 with holes 6 drilled therein is removably attached with a fastener 28 such as a bolt 4, and the outer peripheral edge of the nozzle inner wall panel 27 is made into a curved surface that smoothly continues with the curved end edge of the small diameter slit ring 9. .

Further, a nozzle outer wall plate 30, which has a through hole 29 concentrically and with the same diameter as the through hole 26, is removably attached to the frame plate 2 by means of fasteners 28 such as bolts. A circular depression having the same diameter as the inside diameter of the large diameter slit ring 8 is bored on the mounting surface side of the nozzle outer wall plate 30, and the circumferential wall surface and the bottom surface of the depression are made to smoothly connect with each other by a curved surface. A gap 31 that is parallel and has a predetermined length (with respect to the radial direction) is formed between the bottom surface and the anti-installation surface of the nozzle inner wall plate 27, and the edge of the nozzle inner wall plate 27 and the peripheral wall surface and curved surface of the recess are formed. As a result, a water conduit 32 continuous to the annular slit 10 is formed. Thus, the nozzle 33 is constituted by the nozzle inner wall plate 27 and the nozzle outer wall plate 30. In the above configuration, the water supply pipe 25
Cooling water is supplied to the water supply passage 6.

The cooling water passes through the flow rate adjustment valve 15 and is distributed to each branch room 12, 13,
By changing the flow path area of the flow rate regulating valve 15, the static pressure difference of the cooling water based on the vertical positional difference between the respective compartments 12, 13, and 14 is eliminated. In the process of passing through the flow rate regulating valve 15, the velocity head of the cooling water J is reduced, and the velocity distribution within the division chamber is made uniform.

The cooling water that has passed through the annular slit 10 is guided to the water conduit 32, reaches the gap 31, is rectified, and flows out from the nozzle 33 as a curtain-shaped cooling water. Therefore, through holes 26 and 29
By passing the rod-shaped copper material through the steel material, the steel material can be cooled continuously without uneven cooling.

Note that flow rate adjustment is also possible by adjusting each flow rate regulating valve 15, but it is also possible to change the gap 31 by replacing the nozzle inner wall panel 27 and nozzle outer wall panel 30, or by changing the gap 31 between the frame plate 2 and the nozzle outer wall panel. It is also possible to change the gap 31 by adjusting the thickness of the adjustment packing 34 interposed between the gap 30 and the gap 31.

It goes without saying that the structure of the flow rate regulating valve 15 is not limited to the example described above, and that various structures can be used.
Of course, the flow rate may be adjusted from the side of the frame panel by protruding from the frame panel.

FIG. 4 shows another embodiment in which baffle plates 35 and 36 are provided in the nozzle chamber 7 instead of the cap 19.

As described above, according to the present invention, the rod-shaped material can be cooled with uniform cooling water by providing ridges around the entire circumference, so that uneven cooling can be prevented.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view of a nozzle header according to the present invention, FIG. 2 is a view taken along the line A-A in FIG. 1, FIG. 3 is an enlarged view of part B in FIG. It is an explanatory diagram of an example. 6 is a water supply passage, 7 is a nozzle chamber, 10 is an annular slit, 1
Reference numerals 2, 13, and 14 indicate separate chambers, 15 indicates a flow rate regulating valve, and 23 indicates a nozzle.

Claims (1)

[Claims] 1 Form a concentric annular water supply passage and a nozzle chamber, connect a cooling water supply source to the water supply passage, provide an annular slit in the nozzle chamber, and partition the nozzle chamber into the required number of subchambers to adjust the flow rate of each subchamber. A nozzle header for cooling a rod-shaped material, characterized in that a donut disk-shaped nozzle is connected to a water supply passage through a valve and configured to flow cooling water toward the center of the nozzle chamber, and is connected through an annular slit.