JPH0523560Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a molten metal flow hole having a cooling device, such as a tapping port of a converter, and a means for adjusting the cooling capacity in the cooling device.

[Conventional technology]

Conventionally, the structure of a molten metal flow hole having a cooling device as described above is disclosed in Japanese Utility Model Publication No. 15284/1973;
It is disclosed in Utility Model Publication No. 49-23221.

[The problem that the idea attempts to solve]

In the structure of molten metal flow holes with these conventional cooling devices, when the flow rate of cooling water from the cooling device becomes too large, the molten metal passing through the molten metal flow holes solidifies and adheres, which narrows the molten metal passage area of the flow holes. This will hinder molten metal spill operations. Also,
There has been a problem in that the passage cross-sectional area of the molten metal passing through the flow holes changes significantly due to fluctuations in the temperature of the molten metal, and as a result, the outflow time of the molten metal cannot be controlled.

The present invention provides an apparatus that can sufficiently cope with variations in the flow conditions of molten metal passing through a molten metal flow hole having a cooling device, and can accurately control the outflow time of molten metal.

[Means to solve the problem]

The molten metal flow hole of the present invention has a means for measuring the temperature of the cooling fluid, and a control device that converts the measured value into an output to the cooling fluid flow rate adjustment valve, and the control device adjusts the flow rate of the cooling fluid. The above-mentioned problem has been achieved by making it possible to adjust the opening and closing states of the valve.

By this, the amount of change in temperature of the cooling fluid that has undergone heat exchange is determined, and this is linked to the adjustment of the cooling fluid flow rate adjustment valve to detect the cross-sectional size of the outlet hole, wear, adhesion status, etc. The flow rate of the fluid is automatically adjusted and the passage cross-sectional area of the outflow hole is adjusted to control the outflow time of the molten metal.

In other words, the heat exchange capacity (cooling fluid flow rate or In addition, it would be even better if the temperature of the supply fluid could also be adjusted.)
By controlling this, the degree of adhesion of the molten material to the inner wall of the flow hole is adjusted, and the outflow flow rate is adjusted by changing the molten metal passage cross-sectional area. At the same time, the inner wall of the molten metal flow hole is repaired by coating the inner wall with the adhesion of molten material.

〔Example〕

An example in which the present invention is applied to a converter tap is shown in FIGS. 1 and 2 of the accompanying drawings.

FIG. 1, which shows the overall configuration of the present invention, shows a state in which molten metal is poured into a ladle L from a converter C.

In the figure, 1 is a cooling fluid temperature measuring means provided at the tapping port P, and 2 is a temperature measuring means 1.
A control device is shown in which output is converted to a flow rate regulating valve 4 provided in a cooling fluid flow path 3 based on a measured value. The temperature measuring means 1 may be provided only at the cooling fluid discharge section, but in order to reliably measure the temperature difference, it is preferable that the temperature measuring means 1 is also provided at the supply section and inputted to the control device as data from two locations.

Furthermore, if cooling water is allowed to flow through the tapping port P at times other than when tapping steel, there is a risk that slag and other waste may accumulate in the tapping port and block the tapping port, so cooling water is only used during tapping. It is necessary to pass.

For this reason, a cooling device (water-cooled jacket) 11 is provided around the tapping port P, and a limit switch 12 is installed to detect the tilting angle of the converter, so that both the limit switch 12 and the tapping command signal 13 are turned on.
It is possible to configure a sequence circuit that opens the solenoid valve 14 to allow cooling water to flow when this occurs. Here, the tapping command signal 13 may be provided as a push button on the control panel 2, or a sensor for detecting the flow of molten metal may be connected to the control panel circuit.

Instead of the limit switch 12, the tilt angle may be detected by an encoder.

During actual work, there is time for heat conduction of the refractories around the tap hole and time for the cooling water to be affected, so in the initial stage of tapping, ensure at least the same flow rate of cooling water as in the previous tap. In addition, after the completion of steel tapping,
Even when the limit switch is turned off, the flow rate continues as before the completion of tapping to protect refractories, etc. This flow rate becomes the flow rate at the initial stage of next steel tapping.

FIG. 2 is a cross-sectional view showing details of the tap hole P.

Referring to the same figure, 101 is a converter brick, 102
1 is a water-cooled jacket as a heat exchanger having a cooling function, and a water-cooled jacket 102 is provided around a tap hole 104 as a flow hole by pouring material 103. The outlet 104 is made of a sleeve brick 10 made of carbon-based refractory material with high thermal conductivity.
It consists of 5. Water as a cooling fluid passes through the spiral hollow part of the water-cooling jacket 102 as shown by the arrow, and the outlet 106 and the inlet 10
7 may be provided with a water temperature detector, and for that purpose, it is preferable to use a refractory material with high thermal conductivity.

Similarly, the poured material 103 on the outer periphery of the sleeve brick 105 is made of the same material with high thermal conductivity, which increases the thermal conductivity up to the water cooling jacket 102 and improves the cooling effect. By increasing and lowering the temperature of the inner surface of the sleeve brick 105, the amount of self-coating formed by slag and steel on the inner surface of the sleeve brick 105 can be adjusted, and wear of the sleeve brick 105 can also be prevented.

The temperature detection means does not need to be provided on the cooling water inlet side. Further, it is better to provide an air jet blow at the cooling water supply end to have a function of discharging the water in the water cooling jacket.

[Effect of idea]

The present invention allows the cooling capacity of the cooling device installed at the molten metal flow port to be adjusted arbitrarily according to the conditions of the molten metal flowing down, and thereby the thickness of the self-coating of the molten metal formed at the flow port can be adjusted. Can be adjusted.

Therefore, (1) the tapping time can be accurately controlled regardless of temperature fluctuations in the tapped molten metal; (2) molten metal flow holes (e.g., converter tap opening, degassing furnace immersion pipe) ), the amount of wear and tear on refractories is reduced, and the unit cost of refractories is reduced. It is possible to achieve the following effects.

[Brief explanation of drawings]

Figure 1 shows an example of the overall configuration of the present invention.
FIG. 2 is a diagram showing details of the tap hole. C... Converter, L... Ladle, P... Molten metal flow port, 1... Temperature measuring means, 2... Control device, 3...
...Cooling water flow path, 4...Flow rate adjustment valve, 11...Cooling device (water cooling jacket), 12...Limit switch, 101...Converter bricks, 102...Water cooling jacket, 103...Pouring material, 104...Output Sprue, 105...Sleeve brick, 106...Cooling water outlet, 107...Cooling water inlet.

Claims (1)

[Scope of utility model registration request] A molten metal flow hole equipped with a cooling device having a cooling fluid flow rate adjustment valve is characterized in that it is provided with a means for measuring the temperature of the cooling fluid and a control device that converts the measured value into an output to the cooling fluid flow rate adjustment valve. Molten metal flow holes.