JP3345309B2 - Drainer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a draining technique for efficiently removing water adhering to a material to be rolled during the rolling of a material having a circular cross section or a hollow circular cross section, particularly a wire or a steel bar, by air purging.

[0002]

2. Description of the Related Art In finish rolling of a wire rod or a steel bar, as shown in FIG. 4, for example, a material S to be rolled cooled through a water cooling box 1 is continuously rolled at high speed through a plurality of rolling mills 2 arranged in series. The material to be rolled S that has passed through the rolling mill 2 is:
After water is removed by air purging with a draining device 4 disposed immediately after the rolling mill outlet guide 3, the thickness is measured by a hot gauge 6 through a guide 5. After that, it is sent to the next process. This dimension measurement is based on
Continuous measurement of the diameter of the steel bar to guarantee the dimensions over the entire length,
For grasping dimensions for rolling reduction, a parallel light beam is applied to the material S to be rolled, the light is received by an imaging lens on the opposite side, converted into pulses by a small photoelectric element, and recorded as a digital display and a chart. The backlight type is generally used.

[0003] In the measuring method using the parallel light beam, the presence or absence of extraneous matter on the surface of the material to be rolled S directly affects the measurement result. It must be measured in the state where it was done.

[0004]

However, the conventional draining device blows air perpendicularly to the material S to be rolled from four points in a direction orthogonal to the material S with a nozzle 4n as shown in FIG. 5, for example. These nozzles 4n are simply cut open copper pipes or have blow-off nozzles attached to their ends. As described above, when air is blown from the direction substantially perpendicular to the material S to be rolled, the blown airs interfere with each other, and the efficiency of removing adhered water is deteriorated. In addition, the adhered water is pressed against the surface of the material S to be rolled by air pressure and adheres in a film form, and passes through before being completely removed. Therefore, the material to be rolled S
The nozzles 4n of a plurality of stages are connected and used along. In addition, if the arrangement interval of each step is narrow, the interference of the blown air between the adjacent steps further deteriorates the removal performance, so that it is necessary to arrange the steps at such an interval that no air interference occurs. Therefore, the entire length L of the arrangement span (the interval between the guide 3 and the guide 5) of the draining device 4 is inevitably increased to several meters, and as a result, the entire rolling equipment is affected and the equipment cost is increased. Would. In addition, there is a problem that the twist is easily generated between the rolling mill 2 and the hot gauge 6, and it is difficult to use the dimension measurement result for the rolling reduction.

The present invention has been made in view of such a problem of the conventional draining method, and provides a draining technique in which the efficiency of removing adhering water is markedly improved by improving the air blowing method. The purpose is to:

[0006]

According to a first aspect of the present invention, there is provided a water draining device, comprising: an air ejection slit inclined in a direction opposite to a running direction of a material having a circular cross section or a hollow circular cross section; Above the air ejection slit
An air ejection nozzle disposed on the flow side and inclined in a direction substantially along a tangent to the outer periphery of the material is provided.

A drainer according to a second aspect is characterized in that, in the first aspect, the material is a material to be rolled, and the running direction is a rolling direction .

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 schematically shows an embodiment of the draining device 10 of the present invention, which is intended for the draining device 4 installed between the wire rod or the bar rolling mill 2 and the hot gauge 6 shown in FIG. FIG. 2 is a sectional view taken along the line II-II, and FIG. 3 is a sectional view taken along the line III-II.
FIG. 3 is a sectional view taken along line I. The rectangular housing 11 is formed with a through hole 12 penetrating through the axial center portion thereof, an air introduction chamber 13 having a circular cross section having a larger inside diameter than the through hole 12, and an air supply hole 14 for supplying air from outside to the chamber. ing. In the through hole 12 on the outlet side of the rectangular housing 11,
Is inserted with its tip protruding into the air introduction chamber 13.
Fixed to 1. A to-be-rolled material introduction pipe 15 is inserted into the through hole 12 on the entrance side of the rectangular housing 11 and inserted from the entrance side of the rectangular housing 11 so that the tip end protrudes into the air introduction chamber 13. If necessary, a spacer 16 may be provided on a flange provided on the outer periphery of the pipe.
And is fixed to the housing 11 by bolts 17.

[0009] Rolled material introduction pipe 1 in air introduction chamber 13
The inner diameter surface 15n of 5 is an inclined surface 15t whose front end portion is reduced in diameter from the end surface toward the back. The leading end of the rolled material lead-out pipe 20 in the air introduction chamber 13 has an inclined surface 20t whose outer diameter decreases toward the end. These two inclined surfaces 15t and 20t are opposed to each other with a gap therebetween, and the gap serves as an air ejection slit 21. The air ejected from the slit 21 causes a flow of air that goes in a direction opposite to the material advancing direction.

On the other hand, in the rolled material introduction pipe 15, an outer diameter surface 15 g is provided on the upstream side of the air ejection slit 21.
A nozzle 24 for ejecting air is provided in a direction inclined with respect to the radial direction of the inner diameter surface 15n (tilt angle β with respect to the radial direction, see FIG. 3). Is squirted. The air ejected from here generates a swirling flow on the material surface.

That is, the draining device 10 of this embodiment
The slits 21 are inclined at an inclination angle α in a direction opposite to the running direction of the material S to be rolled.
And a plurality of (eight in the illustrated example) air ejection nozzles 24 inclined at an angle β in the radial direction of the inner diameter surface 15n of the guide hole 15 through which the air flows. This air jet nozzle 24
It is important to incline the inclination angle β in a direction substantially along the tangent of the outer periphery of the material to be rolled in order to increase the drainage effect. The suitable value of β changes depending on the diameter of the material to be rolled, and it is necessary to increase β as the diameter of the material to be rolled increases. Generally, β is preferably 10 ° to 80 °.

Next, the operation of the drainer 10 will be described. The air supplied to the air supply hole 14 of the drainer 10 at a predetermined pressure and flow rate is introduced into the air introduction chamber 13 and is jetted from each air jet slit 21. And it is sprayed on the surface of the material S to be rolled which is passing through the inside of the guide hole 22 at high speed. At this time, the jet air is blown obliquely at an inclination angle α in the reverse direction to the running material S to be rolled. This makes it possible to forcibly peel off the water adhered to the material S to be rolled in a film form from the surface. At the same time,
The jet air is also spirally blown from the air jet nozzle 24 to the surface of the material S to be rolled from a substantially tangential direction. The water adhering to the surface of the material to be rolled is continuously forcibly peeled off by the action of the centrifugal force of the high-speed vortex. Moreover,
Since the air blown out from the plurality of air blowing nozzles 24 does not interfere with each other, the energy of the blown air is not wasted and is directly used for removing adhered water.

[0013] Therefore, the draining performance of the draining device 10 is very high, and it is possible to remove the adhered water in one step, and the entire length of the device is very short. For example, when the draining device 10 is disposed immediately after the exit guide 3 of the finishing mill instead of the conventional draining device 4 shown in FIG. 4, the installation space span L is about 300 mm, which is several m Can be significantly reduced.

It should be noted that the air ejection slit (21) and / or the air ejection nozzle (24) of the drainer (10) of the present invention are not limited to a single-stage arrangement. In consideration of various conditions such as the rolling speed, the pressure of the blowing air, the flow rate, and the like, a multi-stage arrangement can be used as necessary.

It is clear that the object to which the drainer of the present invention can be applied may be any material having a circular or hollow cross section as well as a wire or a steel bar.

[0016]

As described above, according to the present invention,
Spiral air is blown against a material having a circular or hollow cross section, so the efficiency of removing water adhering to the material surface is extremely high, and the installation span of the draining equipment is significantly reduced compared to the conventional model. This has the effect of reducing equipment costs and equipment installation space.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of a drainer of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view taken along line III-III in FIG. 1;

FIG. 4 is a layout view showing an example of a wire rod / bar steel rolling line provided with a drainer.

FIG. 5 is a schematic explanatory view of a conventional drainer.

[Explanation of symbols]

 S Rolled material 10 Drainer 21 Slit for air ejection 24 Nozzle for air ejection

Continuing on the front page (72) Inventor Hidenori Kondo 2-3-2 Uchisaiwai-cho, Chiyoda-ku, Tokyo Inside Kawasaki Steel Corporation (72) Inventor Ryo Takeda 1-chome Mizushima-Kawasaki-dori, Kurashiki-shi, Okayama Pref. Kawasaki Steel Inside Mizushima Steel Works Co., Ltd. (72) Inventor Tomoyasu Sakurai 1-chome, Mizushima Kawasaki-dori, Kurashiki-shi, Okayama Pref. (Without address) Inside Kawasaki Steel Works Mizushima Works, Inc. (No address) Inside the Mizushima Works of Kawasaki Steel Corporation (56) References JP-A-4-228219 (JP, A) JP-A 8-281222 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B21B 45/02 B08B 5/02

Claims (2)

(57) [Claims] An air ejection slit inclined in a direction opposite to a running direction of a material having a circular cross section or a hollow circular cross section , disposed upstream of the air ejection slit and substantially tangent to the outer periphery of the material. A draining device comprising an air jet nozzle inclined in a direction along the drainage device. 2. The drainer according to claim 1, wherein the material is a material to be rolled, and the running direction is a rolling direction.