JPH0221175Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention is a method for attaching and detaching a lower nozzle such as a long nozzle or a submerged nozzle, which is used when pouring molten metal from a molten metal container such as a ladle or tundish. This invention relates to an attachment/detachment device used for various purposes.

Conventional Technology When pouring molten metal from a molten metal container, the bayonet type, lever type, air cylinder type, etc. are generally used as attachment/detachment devices for the lower nozzle, but the workability and pressing force ( seal pressure)
It is well known that the air cylinder type is advantageous when considering stability, etc.; 1, an end flange 5 fixed to the cylinder 3, a rod flange 4, a piston 2 slidably mounted in the vertical direction, an arm 6 rotatably mounted to the rod 21 fixed to the piston 2, and a seal. The lower nozzle 8 is attached and detached by supplying a compressible fluid (hereinafter referred to as gas) such as compressed air or compressed gas from the supply port, and the life of the seal packing 7 is the same as that of the attaching/detaching device. It greatly affects performance.

Problems to be solved by the invention Seal packing 7 usually uses a rubber packing, which has a low heat resistance temperature of around 180°C at maximum, and has the following problems when pouring molten metal. Since the heat resistance of the seal gasket is low, it must be cooled, making the structure of the attachment/detachment device complicated and requiring extra space such as installation space and space for cooling gas piping.The gasket wears out quickly and has a lifespan of approximately 500 cycles. If there is an abnormal heat load during pouring of molten metal and gas leaks, the pressing force will decrease, and if dust gets mixed in with the gas, the packing will wear out. Environmental resistance is poor, such as significantly accelerated aging.

Means for Solving the Problems As a result of various studies and experiments, the inventors of the present invention succeeded in developing the attaching/detaching device of the present invention in order to improve the above-mentioned drawbacks of the conventional method. Although the structure is as specified in the claims of the above-mentioned utility model registration, it will be explained in detail based on the attached drawings showing several specific examples of the present invention.

As shown in FIG. 1, the present invention consists of an end flange 5, a cylinder 3, and a rod flange 4 fixed to a molten metal container iron or a molten metal flow rate control device 1.
and a piston 1 slidably mounted in the vertical direction.
1. Consists of an arm 6 rotatably attached to a rod 22 fixed to a piston 11 and an extendable metal bellows 12 built into the cylinder 3, with at least one gas supply port opened in the bellows. The characteristic structure is the use of expandable metal bellows.

The metal bellows used in the attachment/detachment device of the present invention utilizes the elastic properties of metal.
As shown in the cross section in the figure, it is composed of a thin plate-shaped metal, and the cross-sectional shape is V, S, Y, Ω.
The type is common. In addition, regardless of the cross-sectional shape, structure, manufacturing method, and material, such as one-layer structure as shown in FIG. 4a, two-layer structure as shown in FIG. 4b, molded products, electrodeposition products, A flexible metal bellows that utilizes the elastic properties of metal.

Next, the attachment/detachment device of the present invention will be explained using a specific usage example.

FIG. 2 shows an example in which a metal bellows (hereinafter simply referred to as bellows) is used for both raising and lowering.

Molten metal container shell or molten metal flow rate control device 1
End flange 17 fixed to the end flange, cylinder 18 fixed to the end flange, rod flange 19 fixed to the cylinder 18, cylinder 18
A piston 1 is vertically slidably mounted inside the piston 1.
6. Arm 6 rotatably attached to a rod 23 fixed to the piston 16; Single-layer bellows 1
The bellows 12 has three and two layers. The support case 20 into which the lower nozzle 8 is inserted is supported by the arm 6, and gas is supplied from the gas supply port A opened in the bellows 12, and the supply port B is opened, so that the bellows 12 is expanded by the gas pressure. , the bellows 13 is compressed to raise the arm 6 supporting the support case 20, the rod 23 and the piston 16, and the lower nozzle 8 is fixed;
Ensures a seal when pouring molten metal and prevents air from being drawn in.

When replacing the lower nozzle, gas is supplied from the gas supply port B opened in the bellows 13, 13 is extended, port A is opened, and the bellows 12 is compressed, thereby lowering the arm 6, rod 23, and piston 16, and lowering the lower nozzle. The nozzle 8 can be replaced.

Figure 3 shows a type that combines a bellows and a spring.

As shown, an end flange 17 fixed to the molten metal container shell or molten metal flow control device 1;
Cylinder 1 fixed to end flange 17
8, a rod flange 19 fixed to the cylinder 18, a piston 16 mounted so as to be slidable in the vertical direction, an arm 6 rotatably mounted to a rod 23 fixed to the piston 16, a cylinder 1;
a spring 21 disposed inside the cylinder 8 to push the piston 16 upward; and a bellows 13 attached above the piston 16 inside the cylinder 18.
It is of a more structured type.

During operation, gas is supplied from the gas supply port C opened in the bellows 13 to extend the bellows 13, compress the spring 21, and lower the rod 23, piston 16, and arm 6. The support case 20 into which the lower nozzle 8 is inserted is supported by the arm 6, and by stopping the gas supply from the gas supply port C and opening it, the arm 6 supporting the lower nozzle 8, the rod 23, and the piston 16 are spring-loaded. The lower nozzle 8 is raised by the force of the spring 21, and the lower nozzle 8 is fixed by the force of the spring 21. The operation when replacing the lower nozzle 8 is almost the same as the example shown in FIG. 2 above.

Effects of the invention By using the metal bellows described above, the heat resistance is increased, the durability is increased, and it can be used more than 2000 times.There is no wear due to dust, etc., and the environmental resistance is increased.The cooling mechanism is improved. This eliminates the need for a cooling mechanism, which simplifies the structure of the attachment/detachment device. It eliminates the need for a cooling mechanism, making the installation space more compact. It eliminates the need for cooling piping, allowing for more space to be used, and increasing durability, which reduces maintenance costs. There are various advantages such as a reduction in width.

[Brief explanation of the drawing]

Figures 1 to 5 are sectional views showing specific examples of the attachment/detachment device of the present invention, and Figure 6 is a sectional view of a conventional system. , 2, 11, 16: Piston, 3, 1
8: Cylinder, 4, 19: Rod flange,
5, 17: End flange, 6: Arm, 7: Seal, 8: Lower nozzle, 9, 20: Support case,
12: Double layer bellows, 13: Single layer bellows, 2
1: Spring.

Claims (1)

[Claims for Utility Model Registration] (1) In a cylinder-type molten metal container lower nozzle attaching/detaching device, a telescopic elastic metal bellows is disposed inside at least one side of a piston in the cylinder, and at least one bellows is disposed inside the bellows. A lower nozzle attaching/detaching device for a molten metal container, characterized in that a gas supply port is opened. (2) The lower nozzle attaching/detaching device for a molten metal container according to claim 1, wherein the elastic metal bellows is disposed on one side of the piston, and a spring is disposed on the other side of the piston.