JPS5940143Y2 - Scum suction device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a scum suction device for suctioning scum, particularly scum floating on the surface of a molten metal.

Conventionally, as shown in FIG. 1, a suction head 1 connected to a suction device such as a vacuum pump or an ejector is positioned at an appropriate interval on the surface of a kacam A floating on the surface of a molten metal 8. However, as shown by the arrow in FIG. 1, an air flow is generated and a large amount of external air is sucked in, so that the suction force of the suction device does not effectively act on the scum.

In addition, if the sucked scum is not solidified immediately, later processing is troublesome.

In view of the above points, it is an object of the present invention to efficiently suck up scum over a wide area and to facilitate the disposal of the sucked scum.

An embodiment of the present invention will be described below based on the drawings.

In FIG. 2, 1 is a suction head communicating with a suction device, and a suction port 2 is opened at the tip thereof.

Reference numeral 3 denotes a gas injection device disposed around the outer periphery of the suction head 1, which includes a heating chamber 4 constituted by an annular container 5 and an annular gas injection nozzle 16 communicating with the heating chamber 4 and facing the scum surface. The gas injection nozzle 16 is formed to be inclined radially outward so as to form a truncated conical cylindrical gas flow which is inclined radially outward. ing.

Note that this Figure 2 is for explaining the action during suction of the cylindrical gas flow, and therefore the structure of the suction head is shown in a simplified manner, and the configuration for injecting water into the scum suction path is omitted. .

Next, the structure of the suction head 1 and the gas injection device 3 will be explained in detail with reference to FIG.
0 and an outer cylinder 21, these form cooling water jackets 43 and 44, the outer cooling water jacket 43 is connected to a water supply device (not shown), and the inner cooling water jacket 44 is connected to a drainage system. coupled to a device (not shown).

22 is a suction body fixed to the lower end of the outer cylinder 21 and the lower end of the cylindrical sleeve 23 extending to the lower end of the inner cylinder 19;
At the inner periphery of the lower end of this suction port main body 22, a suction cap 24 is provided.
It is removably fixed so that it can be easily replaced in case of damage.

The suction port 2 is opened at the inner periphery of the suction cap 24 .

Reference numeral 25 denotes a water injection nozzle forming member disposed on the inner periphery of the cylindrical sleeve 23, and the lower end surface of this nozzle forming member 25 and the upper end surface of the suction mouthpiece 24 form an annular first water injection nozzle 4.
5 is formed, and a second water injection nozzle 26 is formed by the outer peripheral surface of the nozzle forming member 25 and the inner peripheral surface of the cylindrical sleeve 23.

27 is a cylindrical sleeve 23 facing the nozzle forming member 25;
The water holes 27 are water holes drilled at regular intervals in the circumferential direction. The outer cooling water jacket 43 and the inner cooling water jacket 4 are connected to each other via the return water channel 30 in the shutter support member 28
It communicates with 4.

31 is a water shutter whose lower end is in close contact with the suction body 22 to prevent water from being supplied to the water passage hole 27, and is supported so as to be movable up and down between the shutter support member 28 and the cylindrical sleeve 23. , the upper protrusion 31 a fits into a sealed chamber 32 formed by the shutter support member 28 and the cylindrical sleeve 23 .

The upper chamber 33 of this sealed chamber 32 communicates with the first oil supply pipe 34 in the inner cooling water jacket 44 through the oil supply hole 35 of the cylindrical sleeve 23, and the lower chamber 36 communicates with the first oil supply pipe 34 in the inner cooling water jacket 44.
8 in the cooling water jacket 44 through the oil supply hole 37.
A hydraulic elevating device 39 is provided at the bottom of the tank, which communicates with an oil supply pipe 38, thereby elevating and lowering the shutter 31 using hydraulic pressure in the upper chamber 33 and lower chamber 36.

Starting and stopping the supply of oil to the supply pipes 34, 38 takes place via a pressure sensor (not shown) provided in the scum suction channel 42.

Further, the annular container 5 of the gas injection device 3 includes a connecting member 6a provided on the suction head 1, a connecting member 6b provided on the annular container 5, and a backing interposed between both the connecting members 6a and 6b. The member 7 is attached to the outer periphery of the suction head 1 so that the space between the member 7 and the outer surface of the suction head 1 is airtight by means of bolts and nuts that fasten them.

The annular container 5 is provided with a supply pipe seat 8 on its upper surface for attaching an air supply pipe (not shown) communicating with a compressor or blower, and an air outlet 9 on its lower surface.

Reference numeral 12 denotes a nozzle forming ring screwed onto the sleeve 13 at the lower end of the annular container 5. On the inner circumferential surface of the nozzle forming ring 12, the diameter of which gradually increases as it moves downward, are shown in FIG. As shown in Fig. 5, the angle α with respect to the end face is 20
A large number of grooves 14 are formed at equal intervals in the circumferential direction, each having an angle of 90 degrees.

As shown in FIG. 2, the inner circumferential surface of the nozzle forming ring 12 and the cylindrical portion 15, which extends from the lower end of the annular container 5 and has a tapered cross section that gradually increases as the outer circumferential diameter moves downward. As shown in FIG. 3, an annular gas injection nozzle 16 slanting outward in the radial direction is formed.

Reference numeral 17 is a knob for adjusting the gas injection nozzle 16 by rotating the nozzle forming ring 12.

According to this configuration, when the suction device communicating with the suction head 1 is operated and air is sent into the heating chamber 4, the air is further heated and pressure-accumulated by the radiant heat from the molten metal, and the scum A is ejected from the gas injection nozzle 16. It is sprayed at high speed towards the surface.

By this injection, a truncated cone-shaped cylindrical gas flow that reaches the surface of the scum A and continues in the circumferential direction is formed, and the flow direction of the cylindrical gas flow is inclined in the circumferential direction by the groove 14. It is formed.

On the other hand, a negative pressure is formed in the cylindrical gas flow by the suction device, so that the cylindrical gas flow reaches the surface of the scum A as shown by the arrow a in FIGS. 2 and 6, and changes its direction. Change the suction port 2 of the suction head along the surface of the scum A.
, further rises in a tornado shape and is sucked into the suction head 1 .

At this time, external air is also sucked into the suction head 1 along the surface of the scum A as indicated by the arrow.

The gas flow a along the surface of the scum A and the external air flow act to draw the scum A from the periphery toward the center of the suction port 2 of the suction head, causing it to rise toward the suction port 2 in a tornado shape.

The collected scum A passes through the suction port 2 and is sucked into the suction head.

In this way, the formation of the cylindrical gas flow and the negative pressure inside the cylindrical gas flow cause a suction effect toward the center of the cylindrical gas flow and a tornado effect, thereby improving the suction efficiency.

In addition, since a truncated cone-shaped cylindrical gas flow is formed that slopes outward in the radial direction, the area of the scum surface surrounded by the cylindrical gas flow is wide even when suction is performed by the suction head.
A wide range of scum is sucked up.

On the other hand, in the suction head 1, when suctioning the scum A, the water shutter 31 is raised and the water passage hole 27 is opened, and the water supplied from the cooling water jacket 43 on the outer periphery through the supply channel 29 flows into the suction head 1. 1 from the water injection nozzle 45 toward the center of the suction nozzle 24, and the scum A in the suction port 2 sucked as described above is rapidly cooled and solidified, and the solidified scum, the jetted water, and the The gas flow is suctioned and transferred within the suction path 42 .

In addition, this jetted water cools the suction nozzle 24, and a water film is formed on the suction nozzle 24, thereby reducing direct contact of scum with the suction nozzle 24, resulting in a noise reduction effect. occurs.

Further, water is jetted from the second water jet nozzle 26 along the inner peripheral surface of the cylindrical sleeve 23 at the same time as the jet from the first water jet nozzle 45, and the scum is removed from the cylindrical sleeve by the jetted water. 23 is prevented from adhering to the inner circumferential surface.

By the way, if the amount of water injected from the water injection nozzles 45, 26 is not constant, it will affect the suction performance of the suction head.

Therefore, it is necessary to supply water to the water injection nozzle at a constant pressure, but even if it is attempted to supply water at a constant pressure, the pressure is likely to fluctuate due to a voltage drop in the supply pump, fluctuations in the operation of the metering valve, etc.

Therefore, a return waterway 30 is provided as in this embodiment,
If the bottom of the tank is set so that water is supplied to the outer cooling water jacket 43 through a quantitative adjustment valve and water is drained from the inner cooling water jacket 44 through a quantitative adjustment valve, the amount of water supplied will be constant regardless of pressure fluctuations. A constant amount of water corresponding to the difference between the amount of water and the amount of water discharged is always injected from the nozzle 45.26.

Moreover, when the return waterway 30 is provided as described above, the effect of preventing local heat accumulation can be obtained.

If the pressure in the scum suction path 42 changes abnormally due to a power outage or a failure of the vacuum pump, oil is supplied from the first oil supply pipe 34 to the upper chamber 33 based on the signal from the pressure sensor, and the water shutter 31 is closed. When the water supply to the water passage hole 27 is stopped and water supply is started again, the second
The lower chamber 36 is supplied with oil from the water supply pipe 38 through the oil supply hole 37, and the water shutter 31 is raised, but since the supply of jet water is stopped in this way at the water shutter 31 immediately adjacent to the nozzle 45.26, Unlike the system in which the water supply is stopped by operating a cock installed in the middle of the piping system, the injection from the nozzles 45, 26 is immediately stopped by operating the water shutter 31, which is extremely safe.

Furthermore, since the water shutter 31 is forcibly raised and lowered by hydraulic pressure within the sealed chamber 32, reliable operation is possible.

Note that the operation of the water shutter 31 is not limited to hydraulic pressure.
It may be performed using air pressure, water pressure, etc.

In addition, in the gas injection device 3, heating of the air by the heating chamber 4 is intended to reduce the amount of air used, but at the same time, high temperature air is blown onto the scum surface A, which causes the scum to be heated. is prevented from cooling and solidifying.

Note that steam or superheated steam can be used from the nozzle 16 instead of air, and in that case, heating by the heating chamber 4 is not required.

Further, for molten metals that are easily oxidized and burned, inert gas such as nitrogen or argon can be used to prevent loss of the molten metals.

Further, in the above embodiment, the groove 14 was provided on the inner circumference of the nozzle forming ring 12 forming the gas injection nozzle 16, but the groove 14
Instead, a protrusion may be formed, and this groove or protrusion may be provided on either or both of the pair of opposing nozzle walls forming the gas injection nozzle 16.

Furthermore, although the gas injection nozzles 16 are arranged in a single ring shape in the above embodiment, they can be arranged in a double ring shape to further improve the suction efficiency.

Furthermore, if a large number of plates 40 are installed on the outer periphery of the sleeve 13 at the lower end of the heating chamber 4, as shown by chain lines in FIG. Airflow movement is assisted to further increase suction efficiency.

Furthermore, since the semi-solidified scum hits the plate 40 and is crushed, suction becomes easy and large scum that cannot enter the suction port 2 can be sorted out.

This wing-shaped plate may be made of steel plate, heat-resistant steel, etc.
Furthermore, the heat resistance can be increased by coating the surface of the steel plate with a refractory material such as ceramic or by spraying alumina.

According to the present invention, a cylindrical gas flow that is continuous in the circumferential direction is formed by the gas injection nozzle, and this gas flow reaches the scum surface and flows along the scum surface toward the center of the suction port. Since it enters the suction port, this gas flow and the air flow from the outside exert a force on the scum toward the suction port, causing the scum to move toward the middle and upper part of the suction port.
The scum suction efficiency is improved, and since the cylindrical gas flow is formed obliquely in the circumferential direction, the gas flow rises in a tornado shape from the vicinity of the scum suction port and enters the suction port. Since the scum is sucked into the suction port in a manner that it is rolled up, the suction efficiency of the scum is further improved. A cylindrical gas flow that is inclined in the direction 6 is obtained.Furthermore, since the cylindrical gas flow is formed to be inclined outward in the radial direction, even when suction is performed by the suction head, the scum is surrounded by the cylindrical gas flow. The surface area can be expanded and scum can be efficiently sucked over a wide range.

Moreover, since water is immediately injected onto the scum sucked by the water injection nozzle to cool and solidify it, suction transfer and post-treatment of the scum after suctioned from the surface of the molten metal are facilitated.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of the suction state by a conventional suction device;
Fig. 6 shows an embodiment of the present invention, Fig. 2 is an explanatory diagram of the suction action, Fig. 3 is an enlarged sectional view of the main part of the suction head, Fig. 4 is a partial bottom view of the nozzle forming ring, FIG. 5 is an internal circumferential view of the same part, and FIG. 6 is an explanatory diagram of the action of the cylindrical gas flow. . 1... Suction head, 2... Suction port, 3... Gas injection device, 12...
Nozzle forming ring, 16... gas injection nozzle,
43... Outer cooling water jacket, 44...
...Inner cooling water jacket, 45...1st
Water injection nozzle, A...Scum, B...
- Molten metal, a... cylindrical gas flow, b... air flow from outside.

Claims (1)

[Scope of utility model registration request] A water spray nozzle for spraying water is provided in the suction path of a suction head that sucks scum, and a cylindrical gas flow spray nozzle that is inclined radially outward is arranged on the outer periphery of the suction head, A scum suction device characterized in that a circumferentially inclined groove or protrusion is formed on at least one of a pair of opposing surfaces forming the injection nozzle.