JP2000146454A - Sub-raw material charging device in melting and refining furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent any trouble in the operation, and to reduce the burden in the labor by surely and smoothly charging a sub-raw material without any labor. SOLUTION: A first chute 28 having a body 28a to cover an outlet 20b and a shut-off valve 24 in an airtight manner is arranged on a lower part of a hopper 20. A plurality of auxiliary charging devices 36 are arranged on the first chute 28 with specified intervals separated from each other in the circumferential direction. A ramming rod 44 is slidably supported in a first support case 38 one end of which is inserted in a through hole 28c formed in the body 28a. Air cylinders 54 are arranged on a rear end of a second support case 50 fixed to the first support case 38, and a rear end of the ramming rod 44 is connected to its piston rod 54a. A tip of the ramming rod 44 is advanced/retracted to/from the inside of the body 28a of the first chute 28 by urging the air cylinders in the forward and reverse directions, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auxiliary material charging apparatus which can reliably supply an auxiliary material as an additive into a furnace when operating a melting and refining furnace.

[0002]

2. Description of the Related Art When operating a smelting and refining furnace, additives such as cold materials, nickel, manganese, and lime are added as additives. In general, the configuration of the auxiliary material feeding device is provided with a hopper communicating with a chute at an upper opening of a furnace body, and a predetermined amount of the auxiliary material is stored in the hopper. You. At the lower part of the hopper, a shutoff valve that can open and close an outlet formed in the hopper is provided, and by operating the shutoff valve to open the outlet, the auxiliary material in the hopper is introduced into the furnace body through a chute. It is to be thrown.

[0003]

Since the auxiliary material in the hopper is introduced into the furnace through a chute, the shapes of the hopper, the outlet from the hopper to the chute, and the shut-off valve are changed. It is necessary to make the structure easy to flow. However, it is a fact that the size of the outlet cannot be increased more than necessary in order to smoothly supply the auxiliary material due to space or structural restrictions. In this case, as described above, the auxiliary raw materials are of various types, and since the bulk specific gravity and the shape are various, the auxiliary raw materials dropped from the hopper are clogged at the outlet of a limited size (so-called “ This causes a problem that a predetermined amount of auxiliary material cannot be put into the furnace, which hinders the operation. In addition, it is necessary to supply a predetermined amount of the auxiliary raw material within a unit time and quantitatively in consideration of the operation timing, but when the above-mentioned shelf hanging phenomenon occurs, molten steel of a desired component is formed. You won't get it.

[0004] When the above-mentioned shelf hanging phenomenon occurs, the work for solving the phenomenon is performed manually in a high-temperature surrounding environment, and thus it is pointed out that a burden on labor is great. In addition, since the work is performed at a high place above the furnace body, there is a problem that safety and workability are not considered when a sudden trouble occurs.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks inherent in the prior art, and has been proposed in order to solve the problem in a suitable manner. It is an object of the present invention to provide an auxiliary material input device in a smelting and refining furnace capable of preventing the operation from being hindered and reducing the labor burden.

[0006]

[Means for solving the problems] To overcome the above-mentioned problems,
In order to appropriately achieve the intended purpose, the auxiliary raw material charging device in the melting and refining furnace according to the present invention includes a hopper communicating with the furnace body via a chute, and an outlet formed at a lower portion of the hopper, which is openably and closably closed. And supplying the auxiliary material stored in the hopper to the furnace through a chute by operating the shut-off valve to open the outlet. In the apparatus, a penetrating rod is provided below the outlet of the hopper in the chute, and is capable of moving forward and backward with respect to the inside of the chute, and moving means for moving the pecking rod forward and backward. By moving forward and backward, a mechanical impact can be applied to the auxiliary material dropped from the hopper to the chute.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a preferred embodiment of an auxiliary material charging device in a smelting furnace according to the present invention will be described.
This will be described below with reference to the accompanying drawings.

FIG. 1 shows a schematic configuration of a melting and refining furnace provided with an auxiliary raw material charging device according to an embodiment. In a furnace body 10 having an upper opening 10a, the opening 10a can be opened and closed. The furnace lid 12 is disposed so as to close the furnace body 10 by closing the upper opening 10a with the furnace lid 12. In the melting and refining furnace of the embodiment, the exhaust pipe 14 extending from the furnace lid 12 is connected to a vacuum suction device.
(Not shown), and the inside of the furnace body 10 can be brought into a predetermined reduced pressure state by performing suction and exhaust by the vacuum suction device.

Above the furnace lid 12, a predetermined amount of the various auxiliary materials 16 described above during the operation of the smelting furnace is used.
An auxiliary raw material charging device 18 for charging the inside is provided. As shown in FIG. 2, the auxiliary material input device 18 includes a hopper 20 in which a predetermined amount of the auxiliary material 16 is stored.
Is supplied through the inlet 20a formed in the upper part thereof.
6 are supplied and stored. The inlet 20a of the hopper 20 is closed and opened by an upper seal valve 22 so that the inside of the hopper 20 can be sealed. Further, an outlet 20b is formed at a lower portion of the hopper 20, and the outlet 20b is openably and closably closed by a shutoff valve 24 operated by an operating means (not shown) such as an air cylinder. The hopper 20 is provided with a plurality of upper limit sensors 26 capable of detecting the presence of the auxiliary material 16, and the storage amount (input amount) of the auxiliary material 16 is set by each sensor 26.

At the lower part of the hopper 20, the outlet 20 is provided.
b and a first chute 28 having a main body 28a that hermetically covers the shut-off valve 24. The first chute 28 is inclined downward and obliquely downward at a position facing below the outlet 20b. A portion 28b is formed. And
By operating the shut-off valve 24 to open the outlet 20b, the auxiliary material 16 in the hopper 20 falls toward the first guide portion 28b of the first chute 28.
Further, the first guide portion 28b is provided in the upper opening 12 of the furnace lid 12.
a connected to a second guide portion 30a that is provided on a second chute 30 that is connected to the first guide portion 30a and that opens obliquely upward and diagonally upward.
(Refer to FIG. 1), the auxiliary raw material 16 dropped from the hopper 20 passes through the first chute 28 and the second chute 30 to the furnace body 1.
It is thrown into 0. The second chute 30 has a furnace lid 1
A furnace lid seal valve 32 that opens and closes the upper opening 12a of the second lid 2 is provided so as to be movable up and down. The seal valve 32 is actuated by an air cylinder 34 so that the interior of the furnace lid 12 and the interior of the second chute 30 are separated. It is configured to be able to spatially block.

The first chute 28 is provided with a plurality of (three in the embodiment) charging assist devices 36 at predetermined intervals in the circumferential direction.
(See FIG. 3). Since the configuration of these three injection assisting devices 36 is the same, the configuration of the injection assisting device 36 located on the right side in FIG. 2 will be described. It will be shown.

As shown in FIG. 4, a through hole 28c is formed in the wall surface of the main body 28a of the first chute 28, and a cylindrical first support case 38 having one end inserted into the through hole 28c.
The other end of the mounting flange 38a formed on the case 38
The intermediate disk 40 is fixed by bolts via the. An O-ring 42 is provided at a position adjacent to the through hole 28a of the first support case 38, and a peg rod 44 having a required length is provided between the O-ring 42 and the center through hole 40a of the intermediate disk 40 in an airtight state. It is slidably inserted and supported. In addition, intermediate disk 40
On the outer surface (surface separated from the first support case 38), a holder 46 having a center through hole 46a for allowing the penetrating rod 44 to be inserted is fixed by bolts, and in the center through hole 46a, as shown in FIG. As shown, a plurality of dust seals 48 are provided at predetermined intervals in the axial direction. The support of the push rod 44 has a dust-proof structure by slidably inserting the push rod 44 through the holder 46 via the dust seal group. The first supporting case 38 extends obliquely upward with respect to the through hole 28a of the first chute 28 as shown in FIG. It is configured to enter the interior of 28a obliquely downward from above. Further, the first support case 38 and the holder 46 for the intermediate disc 40 are provided.
O-rings 49 are provided at the abutting portions, respectively, so that airtightness between the two can be maintained.

The outer surface of the intermediate disk 40 has a cylindrical second
The supporting case 50 has a mounting flange 5 formed at its front end.
Further, the rear end of the second support case 50 is bolted to a bracket 52 disposed on the wall surface of the first chute 28. A double-acting air cylinder 54 as a moving means is disposed outside the rear end of the second support case 50, and the piston rod 54 a of the cylinder 54 facing the inside of the second support case 50 is attached to the push rod 4.
4 are connected at the rear end. That is, the air cylinder 5
The urging rod 44 is configured to reciprocate within the two cases 38 and 50 with a required stroke by urging the front and rear of the case 4 forward and backward, and to move the tip thereof into and out of the main body 28 a of the first chute 28. Then, the tip of the pecking rod 44 is attached to the main body 28a.
When it enters the interior, it contacts the auxiliary raw material 16 in the main body 28a and applies a mechanical impact to the auxiliary raw material 16 so that the raw material 16 can be smoothly fed. In addition, the peg stick 44
Of the tip into the main body 28a at
6 is set to a value that can give an appropriate mechanical impact to 6, and can be arbitrarily changed depending on the type of the auxiliary raw material 16 and the like.

FIG. 6 schematically shows a pneumatic circuit of the injection assisting device 36. The air cylinder 54 of each injection assisting device 36 is provided with compressed air through a solenoid valve 56 and a pressure reducing valve 58. Connected to a supply (not shown). A timer 60 is connected to the solenoid valve 56 so that the operation timing of the three air cylinders 54 can be changed by changing the set time of the timer 60. In the embodiment, the three air cylinders 54 are sequentially operated,
The set time of each timer 60 is set so that the three pegs 44 are sequentially advanced and retracted inside the main body 28a of the first chute 28. A limit switch 62 is provided on the second support case 50 and the air cylinder 5
A dog (not shown) is disposed on the fourth piston rod 54a, and when the limit switch 62 detects a dog, the tip of the push rod 44 is set so as to face a retracted position outside the main body 28a.

[0015]

Next, the operation of the auxiliary raw material charging device in the melting and refining furnace according to the embodiment will be described. The upper opening 12a of the furnace lid 12 is closed by the furnace lid seal valve 32 disposed on the second chute 30, and the inlet 20a of the hopper 20 is opened while the outlet 20b of the hopper 20 is closed by the shutoff valve 24. Then, the auxiliary raw material 16 is supplied into the hopper 20. By stopping the supply when the upper limit sensor 26 disposed on the hopper 20 detects the auxiliary material 16, a predetermined amount of the auxiliary material 16 to be supplied into the furnace body 10 is provided in the hopper 20. Stored temporarily. In addition, auxiliary material 1
6, the inlet 20a is connected to the upper seal valve 22
And the hopper 20, the first chute 28, and the second chute 30 are maintained in an airtight state.

During operation in the furnace body 10, the auxiliary material 1
6, the furnace lid seal valve 3
2 is actuated by the air cylinder 34 to open the upper opening 12a of the furnace lid 12 and actuate the shut-off valve 24 disposed on the hopper 20 to open the outlet 20b. As a result, the auxiliary raw material 16 stored in the hopper 20 is discharged from the outlet 2
0b, falls on the first chute 28, and the chute 2
8 through the first guide portion 28b, the second guide portion 30a of the second chute 30, and the upper opening 12a of the furnace lid 12.
It is thrown into 0. At this time, the three feeding assistants 36 are sequentially operated, and the three pecking rods 44 are moved to the first position.
The chute 28 is sequentially moved forward and backward inside the main body 28a.
That is, as the tip of each pecking rod 44 enters the inside of the main body 28a, the pecking rod 44 comes into contact with the auxiliary material 16 dropped from the hopper 20 to the first chute 28, and a mechanical impact is applied, so that the shelves are suspended. The phenomenon is prevented from occurring. Even if the shelf hanging phenomenon occurs, the sub-raw material group is broken down by the mechanical impact given by the pecking rod 44, and the shelf hanging phenomenon is eliminated.

Therefore, all of the auxiliary raw materials 16 stored in the hopper 20 are reliably and smoothly charged into the furnace body 10,
There is no hindrance to the operation or no possibility of obtaining molten steel of the desired component. In addition, since the hanging of the auxiliary material 16 does not occur, it is not necessary for the operator to manually perform the work for eliminating the hanging at a high temperature and at a high place, and the working conditions can be improved. Since the support portion of the push rod 44 is sealed by the O-ring 42, airtightness is maintained, and there is no hindrance to vacuum melting.

Further, since the first support case 38 and the second support case 50 for supporting the push rod 44 extend obliquely upward with respect to the first chute 28, the sub-cases fall into the chute 28. It is possible to prevent the raw material 16 and dust generated from the raw material 16 from entering the cases 38 and 50 through the through holes 28c, and it is possible to preferably prevent the malfunction of the pecking rod 44 from occurring. Moreover, the peg stick 44
A plurality of dust seals 4 are
8 is provided, it is possible to reliably prevent dust from entering the air cylinder 54 side. Further, by sequentially moving the plurality of push bars 44 forward and backward as in the embodiment,
A mechanical impact can be efficiently applied to the auxiliary material 16 dropped on the first chute 28, and the input of the auxiliary material 16 is more effectively performed. In addition, for each of the dosing auxiliary devices 36, by changing the set pressure of the pressure reducing valve 58 and the set time of the timer 60, the advance / retreat movement time, interval, and pressure adjustment of the pebble rod 44 can be arbitrarily set. An optimum value can be selected according to the type of the raw material 16.

[0019]

[Modification] The means for moving the pusher bar is not limited to the air cylinder of the embodiment, but may be a fluid pressure cylinder using hydraulic pressure or other fluid, or a cam or a link mechanism for controlling the rotational force of the motor. It is possible to use means for converting the motion into a linear motion. Also, the number of the pecking rods is not limited to three, but one, two, or three depending on the size of the hopper.
Alternatively, four or more rods may be provided, and furthermore, the arrangement positions of the pecking rods may be different in height. Furthermore, in the embodiment, the pebble rod is sealed with an O-ring to have an airtight structure. However, the airtight structure can be omitted in a smelting furnace that melts in the atmosphere.

[0020]

As described above, according to the auxiliary material charging apparatus in the melting and refining furnace of the present invention, the mechanical impact is applied to the auxiliary material dropped from the hopper to the chute by the pebble rod. The auxiliary material is prevented from being clogged in the chute, and can be reliably and smoothly charged into the furnace. In other words, the auxiliary material does not cause the hanging of the auxiliary material in the chute and the feeding of the auxiliary material does not become impossible, so that the worker can be released from the work of solving the hanging phenomenon in a high place and in a high temperature environment. Can improve conditions and save labor
(Automation). Further, by sequentially moving the plurality of pegs forward and backward, it is possible to more efficiently supply the auxiliary material. Furthermore, since the pecking rod is configured to enter the inside of the chute from obliquely upward and downward, it is possible to prevent malfunctions due to clogging of auxiliary members and dust in the support part of the pecking rod and the like.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a melting and refining furnace employing an auxiliary raw material charging device according to an embodiment of the present invention.

FIG. 2 is a schematic vertical sectional view showing an auxiliary raw material charging apparatus according to an embodiment.

FIG. 3 is a schematic cross-sectional view showing an auxiliary raw material charging apparatus according to an embodiment.

FIG. 4 is a schematic longitudinal sectional view showing a dosing assistance device according to the embodiment.

FIG. 5 is a schematic longitudinal sectional view showing a main part of the dosing auxiliary device according to the embodiment.

FIG. 6 is a schematic diagram showing a pneumatic circuit of the dosing assistance device according to the embodiment.

[Explanation of symbols]

 Reference Signs List 10 furnace body 16 auxiliary raw material 20 hopper 20b outlet 24 shut-off valve 28 first chute 30 second chute 44 stick rod 54 air cylinder (moving means)

Claims (3)

[Claims] 1. A hopper (20) communicating with a furnace body (10) via chutes (28, 30), and an outlet formed at a lower portion of the hopper (20).
A shut-off valve (24) for opening and closing the (20b) so that the auxiliary material stored in the hopper (20) can be operated by opening the outlet (20b) by operating the shut-off valve (24). Shoot (16) (28,
30) in the auxiliary material charging device in the melting and refining furnace configured to be charged into the furnace body (10) through the chute (2).
The pusher rod (4) disposed below the outlet (20b) of the hopper (20) in (8) and capable of moving back and forth with respect to the inside of the chute (28).
4) and moving means (54) for moving the push bar (44) forward and backward.
By moving the push bar (44) forward and backward with respect to the inside of the chute (28), the chute (2
An auxiliary material input device in a melting and refining furnace, wherein a mechanical impact can be applied to the auxiliary material (16) dropped in 8). 2. The chute (28) has a plurality of pebble rods (4
The auxiliary raw material charging apparatus in the melting and refining furnace according to claim 1, wherein 4) is provided, and the push rod (44) is configured to sequentially move forward and backward. 3. The auxiliary raw material charging apparatus according to claim 1, wherein the push rod (44) is configured to enter the inside of the chute (28) obliquely downward from above.