JPH0638605Y2 - Coolant spray device for transport rollers - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention provides a cooling liquid for spraying a gas-liquid mixed fluid in a mist form from a nozzle in order to cool a conveying roller of a continuous casting facility. It relates to a spraying device.

[Conventional technology]

As a cooling liquid spraying device of this type, conventionally, a liquid supply pipe and a nozzle chip are provided at positions separated above and above a large number of transfer roller groups arranged along a transfer path for transfer. A cooling liquid spraying device for spraying the cooling liquid in a state where water is sprayed onto the cast slab has been constructed (see, for example, JP-A-49-10).
2526 publication).

In such a conventional structure, by directly sprinkling water on the slab, it is effective in cooling the slab, but even if it is effective for cooling the slab, the slab for the conveying roller that is in direct contact with the red-hot slab Since the heat transfer is intensively performed and heated at the contact points, the roller may be strongly affected by the heat and a large distortion may occur.

In addition, spraying water also sprays the spray liquid on the roller surface, but in this case, a part of the roller surface is in contact with the red hot slab, and the roller surface on the opposite side is cooled by the cooling liquid. As a result, the roller is more likely to be greatly distorted.

[Problems to be solved by the device]

In order to eliminate the drawbacks of the above-mentioned conventional upward spraying spraying device, the inventors of the present invention, as shown in FIG. 7, have a nozzle tip (05) having a slit-shaped injection port (05) formed at the tip ( 0A) as shown in FIG. 8 is arranged within the interval between the transfer rollers (16) of the continuous casting equipment, and the contact point between the transfer rollers (16) and the object to be transferred is positively set. I also tried to cool it.

However, in this case, the nozzle tip (0A) is connected to the red hot steel plate (a) and the adjacent front and rear transport rollers (16),
It must be placed in a narrow space between (16) and it must be attached to the tip of the liquid supply pipe (015) whose tip is bent. The spray range of the cooling liquid with respect to the contact point with can not be set sufficiently large in the axial direction of the transfer roller (16), which causes a new problem that it is difficult to spray the cooling liquid uniformly. It was That is, the spray range in the axial direction of the transport roller (16) is a function of the spray angle of the cooling liquid from the nozzle and the distance from the nozzle tip, but the proper spray angle for uniform spraying is There are restrictions and the eighth
Nozzle tip (0
Since the distance from the injection port (05) of (A) to the spraying position can be a very short distance of about 50 mm, it can be sprayed only with a width shorter than the axial width of the transport roller (16), Therefore, the spray amount varies, and as shown by the dotted line (a) in FIG. 6, the roller (16)
There is a possibility that a large distortion will occur.

The object of the present invention is to make the cooling liquid well atomized while arranging the nozzle in a narrow space where the distance to the sprayed object is extremely short, that is, within the interval between the conveying rollers, and to spray the sprayed liquid. An object of the present invention is to provide a spraying device capable of uniformly spraying in a wide range of density.

[Means for Solving the Problems]

The technical means of the present invention taken to achieve the above object is to provide a nozzle group for spraying cooling water to a large number of conveying roller groups arranged at predetermined intervals along a conveying path. In a cooling water spraying device for a transport roller provided, the nozzle is composed of a liquid supply pipe and a nozzle chip attached to the tip of the liquid supply pipe, and the nozzle chip is used for the transportation. The rollers are arranged so as to be positioned within the space between adjacent ones of the rollers, and the tip does not penetrate into the tip body of the nozzle tip along the pipe axis direction at the tip of the liquid supply pipe. That is, the flow path is formed in this state, and the side spray slit is provided on the side surface of the chip main body, which is open to the side of the chip main body at a position on the flow path upper side than the tip of the flow path.

[Action]

The effect of taking the above technical means is as follows.

a. Since the nozzle tip is positioned not above the transport rollers but within the adjacent space between the transport rollers, the nozzle tip should be positioned directly at the contact point between the transport rollers and the transport target. It can be arranged so as to spray the cooling liquid, and the nozzle body of the nozzle tip is positioned so as to be along the linear pipe axis direction of the liquid supply piping part, so that the nozzle outlet position is conveyed. Since the charging roller and the object to be conveyed are positioned so as to be separated from each other at the contact point, it is easy to secure a sufficiently large spraying range of the nozzle onto the conveying roller.

b. As a nozzle tip, provided with a side spray slit formed on the side of the tip body on the side of the flow passage that is formed on the tip side of the passage formed in the tube axis direction of the tip body, and Since a recess is formed on the lower side of the flow path that intersects the slit, the recess that closes the end of the flow path reduces the dynamic pressure of the fluid and increases the pressure in a state where the dynamic pressure has little effect. And a turbulent flow generated by the recess adjacent to the slit, and a turbulent flow generated by the recess adjacent to the slit, the synergistic effect of the turbulent flow causes the A jet pressure that is substantially uniform is dispersed over the entire width direction, and the spray flow is jetted from the slit over a wide range in the width direction substantially uniformly.

〔Example〕

 Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 2 is a cross-sectional view of the nozzle tip (A) for gas-liquid mixing and spraying, in which the gas-liquid mixing channel (4) in the tip body (1) connected to the screw hole (3) of the nut part (2) is the tip part. Is formed in the axial direction of the pipe, and communicates with the gas-liquid mixing flow channel (4) on the upper side of the tip of the gas-liquid mixing flow channel (4) as shown in FIGS. 2 and 3. In this state, the slit (5) is formed with a wide angle toward the side surface of the chip body (1).

Then, the inner surface of the concave portion (13) at the tip of the flow channel formed on the lower side of the intersection with the slit (5) in the gas-liquid mixing flow channel (4) is formed into a spherical surface or a shape close to a substantially spherical surface. And, the intersection angle (α) on the side of the recess (13) where the score line (19) of the slit (5) and the spherical surface intersect is formed to be smaller than 90 degrees. Further, as shown in FIG. 3, the slit (5) is long in the width direction and is cut into a large arc shape to the inner part of the flow path (4) so that it can be jetted at a wide angle. is there.

Further, the side spray slit (5) has an obtuse angle (θ) with respect to the tube axis of the gas-liquid mixing channel (4) on the upstream side of the channel.
The slit width direction is formed orthogonal to the tube axis.

As for the molding direction of the slits (5), if the slit width direction is orthogonal to the tube axis and the side faces are bored toward the bottom, the left and right water amount densities are symmetrical and a uniform distribution state can be obtained. In the side view of the slit (FIG. 2), (θ) may be formed at a right angle or an acute angle with respect to the tube axis.

The nozzle tip (A) constructed as described above is attached to the tip connecting portion (7) of the gas-liquid mixing pipe (6) shown in FIG.
The water and air pumped from the water supply pump (8) and the air compressor (9) pass through the annular space (10) and the air injection flow path (11), respectively, and become water in the gas-liquid mixing space (12). The mixture is mixed and sprayed in a wide angle from the slit (5) through the gas-liquid mixing flow path (4) of the nozzle tip (A).
At this time, the mixed liquid that has passed through the gas-liquid mixing flow channel (4) is inverted at the recess (13) at the tip of the flow channel (4) to generate turbulent flow, and the gas-liquid mixed fluid becomes the gas-liquid mixing flow channel (4). From the slit (5) to a wide angle, and the jet pressure is distributed over the entire wide slit flow path (14). A spray stream is jetted uniformly. As a result, as shown in FIG. 5, the water is sprayed over a wide range with a substantially uniform water amount density with little variation.

As shown in FIG. 1, the transport roller cooling liquid spraying device of the present invention comprises a transport roller (16) for a glowing steel plate (a),
The nozzle (15) that cools (16) is connected to each transport roller (1
6) are arranged within the adjacent space.

The transfer rollers (16), (16) have a diameter of 400 mm and are arranged at a pitch of 450 mm above and below, respectively.
The red hot steel plate (a) is conveyed by being pinched by (16). And the nozzle (15) with the nozzle tip (A) attached to the tip
Are arranged in a state where the nozzle tip (A) is located in a narrow space between the rollers (16) and (16) adjacent to the red hot steel plate (a), and the red hot steel plate (a) and the roller (16) are It is designed to be sprayed on the contact part.

Nozzle (01) using the nozzle tip (0A) shown in FIG.
According to the arrangement configuration of FIG. 5) (FIG. 8), since the tip of the nozzle (015) must be bent, the minimum distance from the injection port (slit) to the spraying part is an extremely short distance of about 50 mm, While it was sprayed only with a width shorter than the width of the roller (16), according to the arrangement configuration using the nozzle (15) of FIG. 4 as in the present invention, the slit of the nozzle (15) The minimum distance from (5) to the spraying part can be kept at a relatively long distance of about 185 mm, and the spraying can be performed with a width considerably larger than the width of the roller (16). It can be sprayed almost uniformly in the width direction. As a result, the distortion of the roller (16) can be greatly reduced, as shown in FIG.

Incidentally, FIG. 6 shows the maximum bending amount of the center portion in the width direction of the roller shaft core when the red hot steel plate (a) is conveyed by rotating the roller (16) once per minute. In FIG. 6, the amount of deflection changes with the passage of time, but this is due to the roller (16).
It seems that the scale adheres to the surface. According to FIG. 6, the average value measured 36 times every 3 minutes is 0.81 mm in the conventional structure, while it is 0.46 mm in this embodiment, and the whirling amount (deflection amount) is significantly reduced by about 43%. I was able to do it.

In the above embodiment, the inner peripheral surface of the recess (13) at the tip of the flow path (4) is formed as a spherical surface, but a flat surface orthogonal to the tube axis of the flow path (4) is formed at the tip of the recess (13). You may. Moreover, the cross-sectional shape of the recess (13) orthogonal to the tube axis of the flow path (4) is
It may be formed in an elliptical shape that is long in the jetting direction of the slit (5) or in the direction orthogonal to this.

Incidentally, FIGS. 9 and 11 and FIG. 12 are examples of nozzle tips shown for comparison with the nozzle tip of the cooling liquid spraying device of the present invention, and are shown in FIG. Flow path (0) formed in the direction of the tube axis of the nozzle tip body (01)
4) Connect it to the tip of the tip and bend it smoothly to
The side spray type nozzle with the slit (05) opening to the side of 1) does not require a curved portion in the nozzle, so the distance between the slit (05) and the spraying position can be relatively long. In order to reduce the water flow resistance, such a structure has a tip body (01) that is smoothly bent in an arc shape from the tip of a flow path (04) formed in the tip axis direction of the tip body (01). Since the slit (05) was formed on the side surface of the channel, the flow in the center of the flow channel (04) was too strong, and as shown in Fig. 10, the water amount density in the width direction of the water amount sprayed per unit time. The distribution becomes larger in the center,
There are large variations in the cooling effect (water flow density).

As shown in FIG. 11, a state in which the injection port (05) is formed in the axial direction of the tube and the flow path (04) is orthogonal to the flow path (04) without forming a smooth bent portion. When the slits (05) were formed by refracting with, the water density distribution was better than that of the conventional structure shown in FIG. 9 etc., but the water density in the central part was still large and a uniform water density could not be obtained. It was

In addition, the structure shown in FIG. 12 in which a hemispherical convex portion (021) is formed at the tip of the flow path (04) with a screw (020) in the structure shown in FIG. In the case of the structure, water droplets are partially scattered like in the case of sputter dash coating, and there is a drawback that a good spray cannot be obtained.

[Effect of device]

Place the nozzle tip not in a position above the transfer rollers but in the adjacent space between the transfer rollers, and spray the cooling liquid directly on the contact point between the transfer rollers and the transfer target. As a result, the transport roller can avoid the adverse effect of heat transfer from the transport target as much as possible, and the nozzle body should be positioned so that it is along the straight pipe axis of the liquid supply pipe section. The exit position can be located as far as possible from the contact point between the carrying roller and the object to be carried, and that the nozzle tip that can spray uniformly over a wide range at a wide angle in the axial direction of the carrying roller is used. Due to the synergistic effect, it is possible to perform good spraying over a wide range of sprayed objects and with a small difference in spraying amount even in a narrow space.

Since the water quantity density of the spray flow jetted from the slit can be jetted in a substantially uniform state with little variation over a wide range in the width direction, for example, in the case where the sprayed object is a conveying roller of a red-hot steel plate, it has almost the entire width. It has the advantage that it can be uniformly cooled over all the time, it can be cooled without causing distortion to the roller as much as possible, and that it can be satisfactorily sprayed on the object to be sprayed.

[Brief description of drawings]

FIG. 1 shows an embodiment of a cooling liquid spraying device for a transfer roller of the present invention. FIG. 1 is a side view showing a schematic arrangement of a cooling device for a transfer roller of a continuous casting facility, and FIG. 2 is a vertical sectional view of a nozzle tip. FIG. 3 is a front view thereof, FIG. 4 is a vertical cross-sectional view of the nozzle device, FIG. 5 is a water amount density distribution diagram, FIG. 6 is a graph showing the maximum amount of deflection of the conveying rollers, and FIG. 7 is a conventional structure. FIG. 8 is a vertical sectional view of a nozzle tip of FIG. 8, FIG. 8 is a side view showing a schematic arrangement of a conventional cooling liquid spraying device, and FIGS. 9 and 11 and 12 are vertical sectional views of a nozzle tip showing a comparative example. Figure 10 is a water quantity density distribution map. (1) ... chip body, (4) ... gas-liquid mixing channel,
(5) …… Slit, (13) …… Concave.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Sanji Asano, Sanji Asano 1-1-1, Emitsu, Hachiman-ku, Kitakyushu, Kitakyushu, Fukuoka (72) Inside the Hachiman Works, Nippon Steel Corporation (72) Osamu Nagae, Hachiman, Kitakyushu, Fukuoka 1-1-1, Edamitsu, Higashi-ku Inside the Yahata Works, Nippon Steel Co., Ltd. (72) Inventor, Kuma Maeda 1-1-1, Yasumitsu-ku, Kitakyushu, Kitakyushu, Fukuoka (72) Inside the Yahata Works, Nippon Steel Co., Ltd. (72) Inventor Hiroyoshi Asagawa 3-2-511, Ichigaya-cho, Nishinomiya-shi, Hyogo (72) Inventor Yamamoto Ho 300, Kitayura, Hikami-cho, Hikami-gun, Hyogo (56) Reference JP-A-49-102526 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. A transfer roller having nozzles (15) for supplying cooling water to a large number of transfer rollers (16) arranged at predetermined intervals along a transfer path. A cooling water spraying device, wherein the nozzle (15) is provided with a liquid supply pipe (15a) and a nozzle tip (A) attached to the tip of the liquid supply pipe (15a).
And the nozzle tip (A) is arranged in a state in which it is positioned within an interval between adjacent ones of the transport roller (16), and the tip of the nozzle tip (A) A channel (4) is formed in the main body (1) in a state in which the tip does not penetrate along the tube axis direction at the tip of the liquid supply pipe (15a), and
A side spray slit (5) that opens to the side of the chip body (1) at a position on the flow path hand side of the tip of the flow path (4) is provided on the side surface of the chip body (1). Cooling water spray device for transport rollers.