JPS6347408Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a powder supply device to a mold for a continuous casting machine, and more specifically, it is used to prevent oxidation of the surface of molten steel poured into the mold, to retain heat, and to protect the mold and billet. This relates to a device for introducing powder to lubricate the space between the two.

[Prior art]

In continuous casting, in which molten steel is cast into a continuous billet or the like with a predetermined cross-sectional shape, the molten steel is poured into a mold from a ladle or the like through a nozzle. While passing through the mold, the molten steel gradually solidifies and is cast into a shape corresponding to the cross section of the mold, and a continuous billet is pulled out from the other end of the mold. At this time, powder is supplied to prevent oxidation of the molten steel and to lubricate the molten steel and the mold. The tip of a nozzle that pours molten steel from a ladle into a mold is plunged into the molten steel in the mold, and is separately controlled so that the molten steel surface is always at a substantially constant height. The dimension between the inner walls of the mold is the same as the cross-sectional dimension of the billet, and the upper end of the mold is open except for the protruding nozzle, and the molten steel surface is open to the atmosphere. Therefore, the above-mentioned powder is appropriately introduced through the opening and taken into the mold together with the molten steel which is solidified and drawn out. Various types of powder are generally used, and the powder may be supplied into the mold by scattering it to the extent that it thinly covers the surface of the molten steel. The powder prevents the molten steel in the mold from oxidizing, retains heat, and captures floating inclusions, and also promotes sliding between the inner wall of the mold and the molten steel that is starting to solidify, and improves mold release. Therefore, the cast molten steel can be solidified to a desired degree while passing through the mold, and can be drawn out smoothly.

[Problem that the invention attempts to solve]

As described above, powder is supplied to the surface of the molten steel in the mold for the purpose of preventing oxidation and lubricating the powder, but the amount thereof is approximately constant. However, it is often changed depending on, for example, the dimensions of the billet to be cast, the composition of the molten steel, the usage conditions of the mold, and other factors. By the way, it is preferable that the powder be supplied to the molten steel surface as evenly as possible, and the amount needs to be adjusted appropriately, so it is not easy to mechanize it, and conventionally it has been done by relying on manual labor or relying on intuition. Adjustments have been made. Powder is poured onto the molten steel surface by scattering it through the opening at the top of the mold, but this work requires skilled workers to select the appropriate timing and amount of supply as well as ensure uniform distribution. It disappears. Moreover, the working environment is in a high temperature atmosphere, and workers are forced to perform harsh labor.

Moreover, when a powder supply device is introduced into continuous casting equipment, the powder conveyance mode becomes complicated. For example, if the position at which a fixed amount of powder is cut out and the position at the top of the mold where the powder is sprinkled differ due to the height of each floor of the building or the size of various equipment, the powder may be placed horizontally. It is necessary to transport the material vertically or drop it vertically. In horizontal conveyance, for example, a spring feeder can be used to relatively easily transport the powder in a fixed quantity, but in the case of a vertical pipe, it is not easy to transport the powder in a fixed quantity. That is, if the powder bridging phenomenon occurs in the vertical tube, troubles such as a significant decrease in powder transfer speed and clogging are likely to occur.

The present invention was developed to solve the above-mentioned problems, and its purpose is to supply a predetermined amount of powder to the molten steel surface in the mold in an evenly distributed manner, and to maintain the supply smoothly at all times. A device for feeding powder into a mold for a continuous casting machine, which can maintain constant quantity transfer in a vertical pipe etc., while eliminating manual labor and unskilled work by the operator, and relieving the operator of harsh work. The goal is to provide the following.

[Means for solving problems]

The features of the powder supply device for a mold for a continuous casting machine according to the present invention will be explained with reference to FIG. The powder 6 that has been conveyed in a fixed amount is dropped into a reservoir 8 through a vertical pipe 7, and the powder held at a predetermined layer height in the reservoir 8 is carried out by a spring feeder 9, and the powder is placed at the tip of the spring feeder 9. This is a powder supply device configured to scatter powder onto the molten steel surface of a mold 1 for a continuous casting machine from a scattering section 10 provided in the vertical tube 7. The chain 19 is suspended, and the suspension member 21 (see FIG. 3) of the chain 19 is rotatably attached.

[Effect]

Powder 6 cut into fixed quantities and transported
is transferred to the reservoir 8 by falling through the vertical pipe 7. The amount of powder is adjusted in the reservoir 8 so that the layer height is approximately constant, and from there, the powder is conveyed horizontally by a spring feeder 9 and supplied into the mold 1 from a dispersion section 10. Since the chain 19 hangs down and rotates in the vertical tube 7, the powder 6 that has been conveyed in a fixed amount is stimulated by the movement of the chain 19 and continuously flows into the reservoir 8 without causing clogging in the vertical tube 7. be dropped. On the other hand, when powder supply to the mold 1 is not required, the lower end of the vertical tube 7 is removed from the reservoir 8, and the flexible vertical tube 7 is bent and retracted upward with the chain 19 still inside. Ru. When replacing the mold 1, etc., the parts from the reservoir 8 to the dispersing part 10 can be removed, and the vertical pipe 7 does not obstruct its movement.

[Effect of idea]

In this invention, the vertical tube is made flexible, multiple chains are suspended inside the tube, and the hanging body of the chains is rotatably attached, so that the powder inside the vertical tube is moved by the movement of the chains. It is continuously dropped to the reservoir without stopping. Therefore, the powder that has been conveyed in a constant quantity is always maintained at a fixed quantity and is transferred to the reservoir via the vertical pipe. The spring feeder transports the molten steel from the reservoir to the dispersion section, and the amount of dispersion on the molten steel surface in the mold is maintained at a substantially constant level, allowing the prescribed cooling to be performed without interruption of the lubricating effect. If powder supply is not required and the hanging vertical tube becomes an obstacle, it is easy to bend the vertical tube because it is flexible and the chains built into it are also deformable. I can do it. Therefore, even if the configuration requires a vertical tube as a powder supply device, it is possible to eliminate problems such as hindering or delaying other operations due to the presence of the vertical tube. As a result, it is possible to use a vertical tube, and even if the powder transport form and route become complicated, constant transport can be maintained. The amount of powder supplied to the mold is a constant amount commensurate with the situation at that time, and the desired effect can be ensured.

〔Example〕

Hereinafter, the present invention will be described in detail based on examples thereof. Figure 1 is an overall view of the powder supply device.
It is applied to continuous casting equipment that continuously casts billets, etc. The continuous casting machine includes a mold 1, a ladle 3 into which molten steel 2 is poured, a nozzle 4 which injects molten steel 2 into the mold 1 from the bottom of the ladle 3, and a nozzle 4.
It consists of a metal fitting 5 for connecting the billet to the ladle 3, a pinch roller (not shown) for pulling out the solidifying billet from the mold 1, and a cooling device for cooling the billet.

A device for supplying powder 6 for oxidation prevention and lubrication of molten steel 2A into the mold 1 is a device that supplies a fixed amount of powder to a vertical pipe 7, a reservoir 8, a spring feeder 9, and a spray formed at the tip thereof. It has a section 10 and the like. In this example, powder 6
The hopper 11 containing A is carried onto the second floor 12 by a crane or the like and installed on a footrest 12a, and a powder quantitative cutting device 14 is connected to the hopper 11 via an expansion joint 13. The powder quantitative cutting device 14 is driven by the rotation of a motor 15 being transmitted through a sprocket and a chain. That is, a fixed amount of powder under the expansion joint 13 is cut out and conveyed by the spring feeder 16, which has a spiral spring built into its tubular body.

Since the powder needs to be conveyed to the opening of the mold 1 at a different height from the lower end of the hopper 11, the outlet 16 of the spring feeder 16 is
A vertical pipe 7 is arranged directly below a. For example, two vertical pipes are provided as shown in FIG.
8 allows the direction of powder movement to be changed. This is to keep the height of the powder layer in the reservoirs 8A, 8B connected to the lower ends of each vertical pipe within a certain range. The vertical pipe 7 for dropping powder into the reservoir 8 is a flexible pipe made of, for example, nylon, and can be easily connected to and removed from the reservoir 8.

A plurality of chains 19 are suspended in the vertical tube 8, and as shown in FIG. 3, for example, two chains 19A,
19B is attached to a suspension body 21 provided with a universal joint 20. The suspension body 2
1 is rotated by the power of a motor 22 (see FIG. 1) via a sprocket 23 (see FIG. 2a). The chain 19 is used to prevent powder from adhering to the inside of the vertical tube 7 and from growing and causing bridges. This is to ensure that when the pipe 7 is evacuated, the bending action of the vertical pipe 7 is not obstructed by being inside the pipe 7. By the way, the reason why the universal joint 20 is adopted for the suspension body 21 is that when the chain 19 is rotated, the posture of the suspension body 21 is often not constant, so even if the posture changes slightly, the rotation of the chain 19 can be maintained. This is to make it possible.

Two rows of spring feeders 9 are provided below the reservoir 8, and the spring feeders 9 and the reservoir 8 constitute a feeder 24 that supplies powder to the mold 1. The spring feeder 9 is connected to the sprocket 2 by the rotation of the motor 25 (see Figure 1).
6, 27 to drive the reservoir 8.
A fixed amount of powder is continuously transported out. In addition,
When increasing or decreasing the amount supplied to the mold 1, the rotational speed of the motor 25 is changed. The reason why two spring feeders 9 are provided as shown in FIG. 4 is that the tips of the spring feeders 9 are arranged so that the supply to the molten steel surface is uniform around the nozzle 4 when viewed from above. This is because it is necessary to arrange the spraying units 10 facing each other so as to sandwich the nozzle 4 therebetween. By the way,
For example, four spray holes are provided in the spray part 10,
Approximately the same amount of powder is sprayed from all the spray holes. Therefore, in this example, eight spray holes are arranged on the molten steel surface, and nozzle 4
The powder is evenly distributed around the molten steel, and enough powder is constantly supplied to thinly cover the molten steel surface.

The operation of the powder supply device to the mold for a continuous casting machine having such a configuration will be described below.

A large amount of powder 6A is stored in the hopper 11 installed on the second floor 12, and the powder is deposited in the powder metering cutting device 14 via the expansion joint 13 due to the rotation of the spring in the spring feeder 16. It is cut out in quantitative order. If the rotational speed of the motor 15 is set high, the fixed amount of cutout increases. Its speed is controlled by a control signal from a separate control room. The powder that has reached the discharge port 16a at the tip of the spring feeder 16 is introduced into the bifurcated duct 17, and is dropped into one vertical pipe 7 according to the damper 18.
The powder is cut into fixed quantities and transported.
It is transferred to a storage container 8 by falling through a vertical pipe 7. Level sensor 28 attached to reservoir 8
The damper 18 is switched in response to a signal from the pump, and the powder in the reservoir 8 is kept at a substantially constant layer height.
Spring feeder 9 is driven by motor 25,
A fixed amount of powder depending on the rotational speed is horizontally conveyed to the spraying section 10. Powder is dispersed from the dispersion section 10 into the mold 1 through each of the four dispersion holes, and the powder is evenly dispersed onto the surface of the molten steel. The powder is mixed with the molten steel 2 that is continuously introduced from the ladle 3 and incorporated into the molten steel, preventing oxidation of the molten steel 2A and promoting slippage between the molten steel that has begun to solidify and the mold 1, and separation from the mold. be done.

On the other hand, since the chain 19 hangs down from the hanging body 21 and rotates in the vertical tube 7, the powder 6 that has been conveyed in a fixed amount is stimulated by the movement of the chain and continues without clogging in the vertical tube 7. The liquid suddenly falls into the reservoir 8. Therefore, phenomena such as bridging and clogging and falling defects are avoided, and a fixed amount of powder can be transferred in the vertical tube 7, which is not easy to transport.

By the way, when powder supply to the mold 1 is not required, the lower end of the vertical tube 7 is removed from the reservoir 8, and the powder supply device can be removed. That is, the flexible vertical pipe 7 is in a state of bending with the chain 19 built in, and can be retracted upward by fixing the lower end to the lower surface of the second floor. When replacing the mold 1, the parts from the reservoir 8 to the dispensing part 10 can be easily removed, and the vertical pipe 7 does not obstruct the movement of the feeder 24 or the mold 1. Therefore, if the configuration requires a vertical tube as a powder supply device, the disadvantage that its presence obstructs or delays other operations is eliminated. As a result, vertical pipes can be used,
Even if the powder transportation form and route become complicated, fixed amount transportation can be maintained, and the amount of powder supplied to the mold can be kept constant according to the situation at that time, and the desired oxidation prevention etc. can be achieved. It can exert a lubricating effect.

[Brief explanation of the drawing]

Figure 1 is an overall view of the powder supply device of the present invention applied to continuous casting equipment, Figures 2a and b are enlarged front and side views of the vicinity of the vertical pipe, and Figure 3 is of the chain and its suspension body. The enlarged view, FIG. 4, is a diagram showing the arrangement of the powder spraying section around the nozzle. 1...mold, 2,2A...molten steel, 6,6A
... Powder, 7, 7A, 7B ... Vertical tube, 8,
8A, 8b... Reservoir, 9... Spring feeder, 10... Spreading section, 19, 19A, 19B...
Chain, 21... Hanging body.

Claims (1)

[Scope of utility model registration request] The powder that has been conveyed in a fixed amount is dropped into a storage container through a vertical pipe, and the powder held at a predetermined layer height in the storage container is carried out by a spring feeder. This is a powder supply device for dispersing powder onto the molten steel surface of a mold for a continuous casting machine. A powder supply device for a mold for a continuous casting machine, characterized in that a suspension member is rotatably attached.