JP2000271703A - Cast iron machine - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To mutually change between large pig iron for steel making and small pig iron for casting without incurring a stoppage of operation, without the need for two cast iron machines, and An object of the invention is to propose a pig iron machine capable of easily casting cast iron without lowering the yield or increasing equipment costs. SOLUTION: A plurality of molds for casting different types of pig iron are connected in one mold conveyor, and a mold type identification means for identifying a mold type, and a mold type separating means for separating the type pig according to its shape. Cast iron machine provided with sorting means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cast iron machine, and more particularly, to a structure of a cast iron machine capable of producing different types (shapes, sizes) of pig iron in one cast iron machine. .

[0002]

2. Description of the Related Art Mold pigs obtained by casting hot metal include:
There are two types: pig iron for casting mainly used in cupolas and the like, and pig iron for steelmaking used in electric furnaces and converters. Generally, these pig irons are usually manufactured using different cast iron machines, that is, two cast iron machines. This is because typical casting iron pigs are small in size of 5 to 15 kg, while steelmaking iron pigs are large in the order of 30 to 40 kg. It was necessary to select and operate a cast iron machine. In addition, the shape of the pig iron may be changed due to restrictions on handling or use, and when casting such a variety of pig irons, the entire mold must be replaced.

[0003] By the way, a general cast iron machine circulates and moves a mold conveyor formed by connecting a large number of molds of a single type endlessly, and places one end along the moving route into an empty mold. This is a process for continuously producing the desired pig iron by pouring molten iron, cooling and solidifying it while the mold is moving, and releasing and discharging the pig iron (mold pig) solidified at the other end from the mold. is there. That is, a cast iron machine is a conveyor composed of a series of molds in which a single type of mold having a recess forming two to four pig irons is connected in an endless belt shape (generally, about 300 to 400 pieces), that is, a mold conveyor. The mold conveyor is circulated and moved endlessly.

In such a cast iron machine, as described above, if the type of pig iron to be cast should be changed to another type depending on the application, the entire number of molds must be replaced. A great deal of labor and time was required. On the other hand, in order to avoid such problems, it is necessary to use two cast iron machines for casting a casting pig iron and two casting iron machines for casting a steelmaking pig iron. However, there has been a problem that extra facility investment is required due to a decrease in the operating rate of the equipment.

Against this background, a method for producing both small cast iron and large steel pig using a single iron casting machine, in particular, the same mold (Japanese Patent Application Laid-Open No. Hei 5- 154608
Publication). This technology is to increase the height of a partition plate in a direction perpendicular to the traveling direction of a mold conveyor among partition plates that partition the inside of a casting machine of a cast iron machine, and make the height of the partition plate higher than the height of other partition plates. Is a method in which a plurality of types of pig iron are manufactured by one cast iron machine by changing the inclination of the traveling direction of the cast iron. In other words, according to this method, when casting a large-sized pig iron for steelmaking, a large-sized pig iron is formed by pouring the pig iron to a higher level than the partition plate having a lower slope and a lower height. On the other hand, when casting small casting mold pigs, it is possible to manufacture small casting mold pigs by increasing the slope and pouring to a lower level than the lower partition plate. Has become.

[0006]

However, in the above-mentioned cast iron machine, there is a problem that a complicated mechanism for changing the inclination of the mold at a position where the pig iron is poured is required, thereby increasing the equipment cost. On the other hand, if it is attempted to change the inclination partially at the pouring part of the mold conveyor, since the molds are connected endlessly, an excessive tensile stress acts on the link part connecting the molds, and the link part However, there is a problem that it is not possible to avoid a reduction in the life of the device or an increase in cost for improving the material of the link portion. In addition, this technology
Since it is essentially a method of changing the shape of the pig iron by changing the pouring level in the mold, it is simply a mold (cast iron machine)
In addition to changing the inclination, the casting speed must be controlled, and the operation becomes complicated.

[0007] Therefore, an object of the present invention is to reduce the operating rate of a pig iron by reducing the operating rate of the pig iron by extra work such as replacing all the molds by using different types (shapes and sizes) of pig iron. An object of the present invention is to propose a cast iron machine that can be manufactured without requiring a large capital investment for constructing a plurality.

[0008]

Means for Solving the Problems As a result of earnest studies for realizing the above-mentioned object, the inventors have developed a cast iron machine according to the present invention having the following constitution. That is, the present invention relates to a cast iron machine used to obtain a pig iron having a predetermined shape by injecting hot metal into the mold while circulating and moving a mold conveyor in which a number of molds are connected endlessly. A casting machine in which a plurality of molds for casting different types of pig iron are connected in a single mold conveyor.

[0009] In the cast iron machine of the present invention, it is preferable to provide a sorting means for separating and recovering according to the type of pig iron separated from the mold. Further, the iron casting machine of the present invention, along the circulation movement route of the mold conveyor,
Along with mold type identification means for identifying the circulation of different types of molds, sorting means for separating and recovering the cast iron according to the type after the cast pig iron is separated from the mold is provided. Is a more preferred embodiment.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As apparent from the above-mentioned summary, the cast iron machine according to the present invention uses two or more different types of cast iron in order to cast different types of pig iron using one cast iron machine. Are connected to form an endless circulating belt-shaped mold row conveyor structure. With such a structure, two or more types of pig iron can be manufactured with the same casting chance by one cast iron machine, and it is not necessary to perform a complicated and time-consuming replacement of all the molds. Therefore, the operating rate of the cast iron machine is improved, and the equipment cost is reduced as compared with installing two or more cast iron machines.

In addition, in a typical embodiment of this cast iron machine, molds for casting type pigs of the same type (shape and size) are grouped into a group to form a desired type pig iron. Can be manufactured separately in the same casting chance (one charge), and the complicated sorting work after the cast iron can be simplified. For this purpose, in the present invention, at one end of the circulation route of the mold conveyor, the pig iron is separated from the mold, and then, sorting means is provided for separating these according to the type of the obtained pig iron. . With such a configuration, for example, at the time of direct loading on a freight car, etc., two or more freight cars are connected, and by activating the sorting means, a casting pig iron is placed on a front freight car, It is easy to separate and collect the freight cars like steel pig iron. In particular, sorting iron such as a damper or a pusher is used to sort the transfer-type pigs on the outlet side of the cast iron machine, and the sorted pigs are guided to either one of the forked chutes, thereby realizing the separate collection of the freight cars.

In the present invention, in place of the above-mentioned sorting means, a discharge conveyor that rotates in a so-called planar manner, such as a flat conveyor, a curved conveyor or a roll conveyor, is provided at one end (extraction side) of the casting machine. May be arranged, and the accumulation locations of the casting pig iron and the steelmaking pig iron may be sorted according to the turning angle of the conveyor.

Further, in the present invention, in addition to the above-described sorting means, a mold type identification means for judging the timing at which the type of pig iron changes is arranged at an appropriate position on the circulation movement route of the mold conveyor. By adopting such means,
The operation timing of the sorting means for sorting can be controlled. That is, when each of the obtained product pig irons is separated and discharged into a wagon or a conveyor or the like, it can be synchronized with the distribution timing. The use of such a detecting means of the present invention can be synchronized with, for example, timing adjustment when changing cooling conditions in a spray cooling zone between a small pig for casting and a large pig for steelmaking. .

The details of the configuration of the present invention will be described below with reference to FIG.
This will be described with reference to the example of FIG. First, an endless mold conveyor C constituting a main part of a cast iron machine (a frame and a mold driving device are not shown) is formed by connecting a large number of molds in an endless manner. For example, a conveyor C is formed by connecting two types of molds 1a and 1b for each group. Then, at an appropriate position along the circulation movement route of the conveyor C, a mold type identification means 2 represented by, for example, a lever-type limit switch or the like.
For example, when the striker of the limit switch is turned on and off, the timing at which the small mold 1a for casting is changed to the large mold 1b for steelmaking is detected. Further, a sorting device 4 such as a sorter for selecting a dispensing position for sorting and collecting according to the type of the pig irons 3a and 3b is provided at one end of the cast iron machine at the extraction side. In order to transport the separated and collected pig iron, for example, a wagon 5 pulled by a diesel truck or the like is used.

Wagon 5 for transporting separated pig iron
Are usually connected on a track, for example, to stop the wagons 5a and 5b at the dispensing position corresponding to the shape of the pig iron, respectively, and when these wagons 5a and 5b are full,・ ・ Tow to guide to a predetermined position.

The hot metal conveyed by the torpedo car 6 is injected into the molds 1a and 1b through the gutter 7 by tilting the torpedo car 6. For example,
When pouring into the mold 1a for small pigs (3a),
The sorting means 4 arranged on the exit side of the casting machine sets the obtained pig iron 3
a to the freight wagon 5a side, while a large pig iron mold 1
When the pouring is performed to b, the sorting direction of the sorting means 4 is changed to the freight car 5b side by the operation of the striker of the limit switch which is the mold type identifying means 2. At this time, the delay time from the detection of the mold type identification means 2 by the mold type identification means 2 to the actual arrival at the outlet side of the casting machine can be corrected by a timer or the like.

In the above example, two types of pig irons 3a and 3b are cast iron. However, the same means can be adopted when three or more types of molds are connected to form a mold conveyor. Also, the above-described example of the mold conveyor has been described with an example in which two types of pig iron are always operated intermittently. However, if only one type of pig iron is required, the other type pig iron is transferred to the other type pig iron mold. Or stop using the output signal of the mold type identification means 2,
This can be dealt with by exchanging only the mold in that part.

[0018]

EXAMPLE In this example, two types of molds each having a mold length of 300 mm in a cast iron machine having a machine length of 60 m were subjected to a total of 40 molds.
A cast iron machine of a type (200 pieces, 200 pieces) was connected endlessly to form a mold conveyor, which was circulated and moved at a speed of 20 m / min by chain drive. In the casting iron operation, 250 tons of molten iron was injected into each of the above-described molds from a topped car through an injection trough each time. And in the 10-day production plan selected at random,
The present invention was applied in a plan of a total amount of 20,000 tons, with a production ratio of the small pig 3a for casting to the large pig 3b for steel making being 2: 3. In this casting machine, the mold 1a can produce four small pigs 3a of 5 kg each for casting (800 pieces in total), and the mold 1b can produce two large pigs 3b of 15 kg for steelmaking. Each
(Total 400 pieces) 200 molds each capable of being manufactured were equipped. These pig irons 3a, 3b are separated by a sorting means, and are paid out to dedicated freight cars 5a, 5b via a shot. In addition,
In this embodiment, the colors outside the molds 1a and 1b can be distinguished by paint, and a limit switch is attached at a position where the mold 1a is switched to the mold 1b and vice versa. And the sorting means was activated.

As a comparative example, an operation was performed in which a pig iron was produced using a mold conveyor composed only of the mold 1a and then a pig iron was produced using a mold conveyor composed only of the mold 1b.

For the above Examples and Comparative Examples, 10
The daily production and the degree of separation were compared. For comparison of the degree of separation, the percentage of pig iron 3b produced by the mold 1b is
The evaluation was made based on the mixing ratio of the pig iron 3a produced by the mold 1a. Table 1 shows the results. It should be noted that the mixing of the large pig 3b for steelmaking into the small pig 3a for casting is not preferable in terms of the sale of the small pig 3a for casting, so the small pig 3a for casting is mixed with the large pig 3b for steelmaking. Even so, the switching timing was determined so as not to be reversed.

[0021]

[Table 1]

As shown in Table 1, in the comparative example, the mold 1a
It takes approximately 24 hours to change the mold from
Since the actual operation of the cast iron machine in 0 days was 9 days, there was a difference of 2700 to 2900 tons in the production amount as compared with the embodiment of the present invention. In the present invention, the mixing ratio was 3% in (1), but even in this case, the available amount of small pig iron for casting (the amount of 100% casting pig iron) exceeded the comparative example. In addition, in the comparative example, an operation cost for the mold exchanging operation was incurred, which led to an increase in the cost for producing the pig iron. Although the embodiment has been verified with an example in which two types of pig irons are manufactured, a similar effect can be expected in a case where three or more types of pig irons are manufactured.

[0023]

As described above, according to the present invention, in the continuous casting of hot metal into a casting mold, different types of casting pigs are successively transferred during the circulation movement of one casting mold conveyor in which the casting molds are connected endlessly. Since the cast iron machine is manufactured separately, the operation time for mold replacement can be omitted, and the production capacity of the cast iron machine can be improved. In addition, according to the present invention, since the mold replacement operation is basically unnecessary, the operation cost for that is eliminated, and it is possible to prevent an increase in the cost of producing pig iron, and at the same time, to produce a plurality of types of pig iron at once. It is not necessary to install multiple cast iron machines. Moreover, the present invention can be applied to most existing cast iron machines without modification, and is economically excellent.

[Brief description of the drawings]

FIG. 1 is a partially enlarged side view of the device of the present invention.

FIG. 2 is a plan view of an example of the device of the present invention.

[Explanation of symbols]

 1a, 1b Mold 2 Mold type identification means 3a, 3b type pig 4 Sorting means 5a, 5b Freight car 6 Tope car 7 Gutter 8 Hot metal

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tomoaki Tada 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki Steel Corporation Chiba Works

Claims (3)

[Claims] 1. A casting machine used to obtain a pig iron having a predetermined shape by injecting hot metal into a mold while circulating a mold conveyor in which a number of molds are connected endlessly, A cast iron machine characterized in that a plurality of molds for casting different types of pig iron are connected in one mold conveyor. 2. The cast iron machine according to claim 1, further comprising a sorting means for separating and collecting the pig iron separated from the mold in accordance with the type of the pig iron. 3. A mold type identification means for identifying that different types of molds circulate along a circulation movement route of the mold conveyor, and after the cast pig iron is separated from the mold, the mold pig 2. A casting machine according to claim 1, further comprising a sorting means for separating and recovering according to types.