JP2000351059A - Method and device for preventing growth of stuck skull on tip lower part of trough - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain the growth of skull at the tip lower part of a trough, to eliminate a large-scale removing work of the skull and to increase the operating time of equipment by always or intermittently jetting fluid toward the tip lower part of the trough, cooling the tip lower part of the trough and also blowing off the skull. SOLUTION: A fluid header 21 is arranged near the lower part of the trough tip 8a of the fixed trough and connected with fluid piping 23. A fluid nozzle 22 is disposed to the fluid header 21 toward the lower part of the fixed trough tip 8a. Necessary number of the fluid nozzle 22 is arranged according to the width of the fixed trough tip 8a. Molten metal spattered from a mold 2 is blown off by jectting the fluid from the fluid nozzle 22 before reaching the lower surface of the fixed trough tip 8a. As the fluid, it is desirable to use the compressed air. A skull detaching cutter is disposed near the lower surface of the fixed trough tip 8a and it is desirable to detach the skull stuck to the lower surface of the fixed trough tip 8a by advancing/retreating a skull detaching cutter with an actuator.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a metal ingot that flows into a lower part of a gutter when the molten metal flows out from the gutter of the gutter through which the molten metal flows. The present invention relates to a method and an apparatus for preventing adhesion and growth of ingots generated in a lower part of a gutter, such as ingots that are generated by being attached to a lower part of the gutter and scattered in a lower part of a gutter, a pan, a mold, etc. In particular, the present invention relates to a method and an apparatus capable of effectively preventing the growth of metal adhesion to a lower part of a gutter in equipment having a large amount of metal ingot, such as a fixed gutter gutter of a cast iron machine.

[0002]

2. Description of the Related Art In transporting molten metal, a method of forming and flowing a gutter is often employed. In this case, another gutter, pot, mold, or other equipment is installed downstream of the gutter, and the molten metal flows out from the gutter tip, which is the tip of the gutter. In this case, the molten metal flowing out of the gutter tip may travel to the lower part of the gutter tip along the front face of the gutter tip.

When the molten metal flowing out of the gutter tip is poured into a gutter, a pot, a mold, or the like provided downstream, the molten metal often scatters and adheres to a lower portion of the gutter tip. The molten metal spilled to the lower part of the gutter or the molten metal scattered and adhered solidifies at the lower part of the gutter, and if this solidifies one after another, it grows as a base metal at the lower part of the gutter. .

[0004] If the metal is left to grow, the load applied to the gutter tip increases, which may cause damage to the gutter itself or the gutter support base. Gutter installed below when peeling and falling,
Potential damage to equipment such as pots and molds. Therefore, in order to remove such ingots, a worker goes to the vicinity of the lower part of the gutter in a state where the outflow of the molten metal is stopped, and a work such as manual work or scraping and removing with a rock drilling machine occurs. FIG. 3 schematically shows a case in which molten pig iron is cast by a cast iron machine to produce a pig iron.

[0005] The mold conveyor 1 is bridged between a head sprocket 11 and a tail sprocket 12.
Head sprocket 11 to head sprocket drive 15
The belt rotates like a belt conveyor by rotating. Here, the hot metal 4 is transferred from the topido 6 or the like to the moving
Is poured into the mold 2 via. An exchangeable gutter tip may be provided at the tip of the fixed gutter 8.

The hot metal poured into the mold 2 is cooled to the atmosphere, cooled by spraying water with a spray device 9, further cooled by spraying water with a water spray device 10, and solidified in the mold 2. Then, the pig iron 5 is obtained. In the case of continuous casting in a relatively small mold 2 of about several kg to several tens of kg as in the case of the casting machine 3, the outflow speed of the hot metal flowing out is adapted to the capacity of the casting machine. It is necessary to control the temperature of the hot metal to a relatively small value. Further, in order to minimize the scattering of hot metal from the mold at the position where the molten metal is poured into the mold 2, the distance from the tip of the fixed gutter 8 to the mold 2 needs to be as small as possible. If the metal 30 adheres and grows on the lower part, the metal 30 grows until it hits the mold 2, and the mold conveyor 1 is overloaded and stops, or the mold 2 is damaged.

[0007]

As described above, if metal adheres and grows at the gutter tip of a gutter through which molten metal flows, it often causes damage to equipment and the like, so that the metal does not grow excessively. It is necessary to appropriately remove the metal. But,
In order to remove the metal, the operation of flowing the molten metal is stopped, and the removal is performed manually or mechanically.This reduces the operating time of the equipment and reduces the risk of metal scattering when the metal is peeled. is there. In particular, in the case of a cast iron machine, the efficiency of the removal operation is poor because the space between the fixed gutter and the mold is small and the work place is small. In order to improve work efficiency, the tip of the fixed gutter may be removed to remove metal in a separate large area.However, when exchanging the tip of the fixed gutter, dismantling and construction of the gutter refractory, It takes a long time for curing, which significantly reduces the operating time of the cast iron machine.

The present invention reduces the operation time of the equipment by suppressing the growth of the metal by preventing the metal from adhering to the lower part of the gutter as described above, thereby eliminating a large-scale metal removing operation. The purpose is to prevent.

[0009]

Means for Solving the Problems As a result of detailed observation of the state of metal adhesion and growth on the fixed gutter tip of a cast iron machine, the present inventors found that the metal that adhered and grew on the lower part of the gutter was: It was clarified that the molten metal mainly poured into the mold, which jumped up in the mold, adhered to the lower part of the gutter and solidified, and grew by successively overlapping.

[0010] In order to suppress the growth of the metal, it is necessary to block the molten metal so as not to adhere to the lower part of the gutter,
Or, even if it adheres, it is effective to remove the metal before it grows. The present inventors have completed the present invention based on the above findings. That is, the present invention has solved the above-mentioned problems by using the following method and apparatus. (1) A method for preventing metal from sticking and growing on the lower part of a gutter in which a molten metal flows. A method for preventing the growth of metal on the lower part of a gutter, wherein the metal is cooled and the metal is blown off. (2) An apparatus for preventing adhesion and growth of metal on a lower part of a gutter flowing a molten metal, comprising: a fluid nozzle installed toward the lower part of the gutter; And a fluid supply device for supplying the fluid. (3) A method for preventing the adhesion of metal to the lower part of a gutter where a molten metal flows, wherein a metal stripping cutter is operated along the surface of the lower part of the gutter of a fixed gutter. A method for preventing the growth of metal on the lower part of a gutter, wherein the metal is adhered to the lower part of the fixed gutter. (4) An apparatus for preventing the growth and adhesion of metal to the lower part of a gutter flowing through a gutter, wherein the apparatus slides back and forth along the surface of the lower part of the gutter to lower the lower part of the gutter. An apparatus for preventing growth of metal ingot at the lower part of a gutter, comprising: a metal stripping cutter for peeling metal which has adhered to a surface; and an actuator for operating the metal stripping cutter.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention is shown in FIG. 1 using a cast iron machine as an example. In the cast iron machine 3, the mold 2 is connected to form the mold conveyor 1, and the fixed gutter 8 is installed above the mold conveyor 1. A fixed gutter tip 8a is installed at the tip of the fixed gutter 8, and molten metal is poured into the mold 2 from the fixed gutter tip 8a.

In the present invention, a fluid header 21 connected to a fluid distribution pipe 23 is installed near the lower part of the fixed gutter tip 8a, and a fluid nozzle 22 is connected to the fluid header 21 with a fixed gutter tip 8a.
Installed toward the bottom of Fluid nozzle 22 is a fixed gutter
The required number is arranged according to the width of 8a. The fluid ejected from the fluid nozzle 22 has a function of preventing adhesion of the molten metal by blowing off the molten metal splashing from the mold before reaching the lower surface of the fixed gutter gutter tip 8a. At the same time, the fluid also has a function of cooling the lower surface of the fixed gutter tip 8a. If the lower surface of the fixed gutter tip 8a is cooled in advance, the molten metal adhering to the cooled surface is rapidly cooled, and thus has an effect of being easily peeled.

Here, compressed air (compressed air) can be suitably used as the fluid. This is because the compressed air can be easily and inexpensively produced by the compressor 26 and used safely. However, it goes without saying that other gases such as nitrogen and argon can also be used. Further, a liquid such as water is also applicable. In other words, any fluid can be used as long as it has the effect of blowing off the scattered molten metal and cooling the lower surface of the fixed gutter tip 8a.

The fluid may be constantly ejected, or may be ejected intermittently by interposing a valve 27 in the fluid distribution pipe 23 or the like.
Next, another embodiment of the present invention will be described with reference to FIG. In the present embodiment, a metal stripping cutter 24 is installed in the vicinity of the lower surface of the fixed gutter tip 8a, and the metal stripping cutter 24 is advanced and retracted as appropriate to make the fixed gutter tip 8a.
This is for peeling the metal adhered to the lower surface of 8a. As the metal stripping cutter 24, a metal plate, a rod material, a pipe material, and the like arranged in a plurality in the width direction of the gutter tip can be appropriately used.

The tip of the metal stripping cutter 24 is shown in FIG.
As shown in the figure, a diagonal cut may be used to increase the force applied to the surface that comes into contact with the metal, or it may be simply a right-angled cut surface such as a plate material or a bar material.
It is sufficient that the metal has the strength to scrape the metal sticking to the metal. Various types of actuators 25 for moving the metal stripping cutter 24 forward and backward can be used. For example, any type of drive device such as a pneumatic cylinder, a hydraulic cylinder, and an electric cylinder that can reciprocate can be used. Further, the apparatus may be configured so that the cutter can be moved forward and backward by appropriately applying a link mechanism or the like to a rotary drive device such as various motors.

The movement of the metal stripping cutter may be automatically and periodically performed, or may be manually performed at a certain timing when the metal is attached. In the above-described embodiment, the mode at the fixed gutter tip of the cast iron machine has been described for the sake of explanation, but it goes without saying that the same configuration can be adopted and implemented at the gutter tip of the gutter from which the molten metal flows out.

Further, the first embodiment and the second embodiment can be adopted at the same time.

[0018]

Example 1 A fluid header shown in FIG. 1 was installed near the lower part of a fixed gutter tip of a cast iron machine. Here, the applied fluid is compressed air. Three fluid nozzles were juxtaposed in the downward direction at a position 30 cm away from the lower part of the fixed gutter tip (10 cm width). During pouring into the cast iron machine, it was always blown out.

Conventionally, the replacement work of the fixed gutter tip is performed every five charges due to the adhesion of the metal, but by applying this embodiment, the replacement work of the fixed gutter tip can be made unnecessary. Was.
As a result, the fixed gutter tip replacement work that required 35 minutes at a time could be eliminated, and the operating rate of the cast iron machine could be improved by 8.5%. Example 2 A metal stripping cutter shown in FIG. 2 was installed below a fixed gutter tip of a cast iron machine. Here, the applied cutter is an iron plate-shaped cutter having a sharpened tip, and is disposed so as to contact and slide on the entire surface of the lower part of the gutter tip. The actuator was a hydraulic cylinder, which automatically moved forward and backward once every three minutes.

Conventionally, the replacement work of the fixed gutter tip is performed every five charges due to the adhesion of the metal, but the application of this embodiment may make the replacement work of the fixed gutter tip unnecessary. did it. As a result, also in the case of the second embodiment, the same operation rate improvement as in the first embodiment could be realized.

[0021]

According to the present invention, it is possible to prevent the base metal from adhering to the lower part of the gutter tip and to grow, and it becomes unnecessary to replace the gutter tip. As a result, the operation rate of the equipment was significantly improved. Also, according to the present invention,
The work of exchanging the gutters and fusing the metal of the replaced gutters off-line can be eliminated, thereby improving the work safety.

[Brief description of the drawings]

FIG. 1 is a main part side view of a cast iron machine showing an embodiment of the present invention.

FIG. 2 is a main part side view of a cast iron machine showing another embodiment of the present invention.

FIG. 3 is an overall side view of the cast iron machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mold conveyor 2 Mold 3 Cast iron machine 4 Hot metal 5 Type pig 6 Topid 7 Moving gutter 8 Fixed gutter 8a Fixed gutter tip 9 Sprayer 10 Sprinkler 11 Head sprocket 12 Tail sprocket 13 Type pig chute 14 Type pig bag 15 Head sprocket Drive 21 Fluid header 22 Fluid nozzle 23 Fluid distribution pipe 24 Metal stripping cutter 25 Actuator 26 Compressor 27 Valve 30 Metal

Claims (4)

[Claims] 1. A method for preventing adhesion of metal to a lower part of a gutter flowing a molten metal, the method comprising spraying a fluid constantly or intermittently toward a lower part of the gutter. A method for preventing adhesion of metal to the lower part of a gutter, wherein the lower part is cooled and the metal is blown off. 2. An apparatus for preventing the growth of metal ingots on a lower part of a gutter flowing a molten metal, comprising: a fluid nozzle installed toward the lower part of the gutter; And a fluid supply device for supplying a fluid to the gutter. 3. A method for preventing adhesion of a metal to a lower part of a gutter flowing a molten metal, the method comprising operating a metal stripping cutter along a surface of a lower part of the gutter of a fixed gutter. A method for preventing the growth of metal on the lower part of a gutter, wherein the metal is adhered to the lower part of the fixed gutter. 4. An apparatus for preventing the growth and adhesion of metal to the lower part of a gutter flowing a molten metal, wherein the lower part slides back and forth along the surface of the lower part of the gutter. An apparatus for preventing the growth of metal ingot at the lower part of a gutter, comprising: a metal stripping cutter for peeling metal which has adhered to a lower surface; and an actuator for operating the metal stripping cutter.