JPH1025510A - Molten steel treating equipment using ladle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a molten steel treating equipment using a ladle which can execute a heat treatment and a vacuum treatment even in the case of being smaller molten steel treating quantity than the nominal (specific) treating capacity. SOLUTION: This molten steel treating equipment uses the ladle provided with a vacuum treating device 3, a carry in/out part for ladle and a truck 6 for self-traveling the interval between the vacuum treating device 3 and the carry in/out part for ladle. In such a case, an annular-state connecting tool 1 receiving a vacuum treating cover 29 so as to be air-tight state with the upper side receiving surface 8 and formed so as to be air-tightly layable on the receiving surface 10 of the ladle with the lower side laying surface 11. A device attaching/detaching this connecting tool 1 on the ladle 9 laid on the truck 6, is arranged between the vacuum treating device 3 and the carry in/out part of the ladle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an equipment for heating and vacuum-treating molten steel housed in a ladle (molten steel processing equipment).

[0002]

2. Description of the Related Art As shown in FIG. 4, for example, a molten steel processing facility using a ladle is composed of a vacuum processing apparatus 41, a heating processing apparatus 42, an alloy addition apparatus 43, and a loading / unloading section 45 of a ladle 44 and the like. The truck 46 is provided so as to be able to run on a rail laid between them. Molten steel processing by this equipment is performed by using a ladle from a converter or electric furnace.
The ladle 44 is transported by a crane or the like (not shown) and placed on a carriage 46 of the carry-in / out section 45. Thereafter, the carriage 46 is allowed to travel by itself, moved below each of the devices 41 to 43 requiring processing, and subjected to necessary processing such as vacuum processing.
And use it for casting in the next process using a crane or the like.

[0003] The heating treatment device 42 and the vacuum treatment device 41 of the above-mentioned molten steel treatment equipment are usually provided with a treatment lid which is directly placed on a ladle 44 so as to be able to move up and down. In order to perform the process, the vacuum processing lid is directly and air-tightly placed on the pan 44 to suck the inside of the vacuum processing lid.

[0004]

By the way, the size of the ladle 44 used in the above-mentioned molten steel processing equipment is to efficiently process molten steel, so that the processing capacity of the converter and electric furnace in the upper process and the lower process In addition to taking into account the processing capacity of the casting machine, a dedicated ladle 44 adapted to the size of the processing lid of the heat processing device 42 or the vacuum processing device 41 is usually used. For this reason, when the actual amount of molten steel processing is extremely small compared to the processing capacity of the ladle 44 of the molten steel processing equipment, for example, 50 tons of molten steel is stored in the ladle 44 of the molten steel processing equipment with a processing capacity of 100 tons. In such a case, since the amount of molten steel in the ladle 44 is small, in the heat treatment device 42, the stroke of raising and lowering the electrode is short, and the electrode may not reach the molten steel, so that heat treatment may not be performed.

Accordingly, the present invention has been made to solve the above-mentioned problems, and an object of the present invention is to perform a heat treatment or a vacuum treatment even when a molten steel throughput is smaller than a nominal throughput. And a molten steel processing facility using a ladle.

[0006]

In order to achieve the above-mentioned object, a molten steel processing equipment using a ladle according to the present invention comprises a vacuum processing device, a ladle loading / unloading section, and a vacuum processing device and a ladle. In a molten steel processing facility using a ladle that includes a carriage that is self-propelled between the loading and unloading sections, the vacuum processing lid is airtightly received on the upper receiving surface and airtightly placed on the receiving surface of the ladle on the lower mounting surface. It is provided with a ring-shaped connecting tool formed so as to be able to connect and detach the connecting tool to and from a ladle placed on a cart between the vacuum processing device and the loading / unloading portion of the ladle. Things.

[0007] In the structure of the present invention, an annular connecting member is formed so that the vacuum processing lid can be air-tightly received on the upper receiving surface and can be air-tightly mounted on the receiving surface of the ladle on the lower mounting surface. Since the diameter of the mounting surface on the lower ladle is smaller than the diameter of the receiving surface of the upper vacuum processing lid or the heating processing lid, the vacuum processing lid or the heating processing lid The same vacuum processing equipment can be used for ladle with smaller diameter (hereinafter called small ladle) than ladle to be directly placed and used (hereinafter called large ladle)
If the amount of molten steel to be processed is large, it is possible to increase the molten steel surface in the ladle by using a small ladle. Is also possible.

[0008] Moreover, the connection tool functioning as described above is
It is detachably held by a detachable device arranged above a self-propelled carriage between the vacuum processing device and the ladle loading / unloading section,
Only when a small amount of molten steel is used and the small ladle is used, the bogie can be stopped under the attachment / detachment device and the connector can be attached / detached, so that the entire molten steel treatment can be efficiently performed. In addition, since the connection tool can receive a heat treatment lid of a heat treatment device formed in the same size as the vacuum treatment lid of the vacuum treatment device, the heating of molten steel in a small ladle is performed in the case of a large ladle. You can do the same as
If the height of the small ladle is extremely lower than the height of the large ladle, it is advisable to adjust the height by providing a small ladle pedestal on the top surface of the bogie. Thus, the height of the small ladle can be raised, and the height of the connecting device does not need to be increased. Therefore, the space above the molten steel surface in the small ladle can be reduced, and the vacuum processing can be efficiently performed. Further, since the molten steel surface in the small ladle can be set at a high position, the heat treatment can be performed without increasing the elevating stroke of the electrode of the heat treatment device.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall schematic explanatory view of a molten steel processing facility using a ladle according to the present invention. FIG. 2 is a cross-sectional front view showing an outline of a vacuum processing apparatus of the molten steel processing facility using a ladle according to the present invention. 1 is an explanatory view of a connector attaching / detaching device of molten steel processing equipment using a ladle according to the present invention, wherein 1 is a connector, 2 is a connector attaching / detaching device, 3 is a vacuum processing device, and 4 is a heat treatment. The apparatus 5 is a ladle loading / unloading section, and 6 is a trolley. The trolley 6 is a rail 7 laid between the connector attaching / detaching apparatus 2, the vacuum processing apparatus 3, the heating processing apparatus 4, and the ladle loading / unloading section 5.
Run on the top.

As shown in FIG. 2, the connecting member 1 is formed in an annular shape, and the upper part thereof is formed in substantially the same shape as the upper surface of a large ladle (not shown). The receiving surface 8 for receiving the vacuum processing lid 29 and the heat processing lid of the heat processing apparatus 4 is formed. On the other hand, the shape of the lower side is formed to be substantially the same as the upper surface of the small ladle 9 having a smaller diameter than the large ladle,
A mounting surface 11 on the receiving surface 10 of the small ladle 9 is formed. Further, a cooling water flow path 13 is provided in an upper thick portion 12 of the mounting surface 11 and communicates with a cooling water flow path 14 provided inside the receiving surface 8, and cooling water supplied from a water supply pipe 15 is provided. Water is circulated through the cooling water flow path 14 and the cooling water flow path 13 and then drained from a drain pipe (disposed next to the water supply pipe 15 in FIG. 2). By passing this cooling water, the receiving surface 8, the mounting surface 11
Is cooled to protect the sealing material during the vacuum processing and the heat treatment, and the inner peripheral surface of the connector 1 is also cooled, so that the splash during the heat treatment is prevented. In addition, the upper surface of the thick portion 12 is formed flat so that an inner lid 31 of the vacuum processing device 3 described later can be placed thereon.

The connecting / detaching device 2 includes a lifting / lowering drive motor 19 provided on a gantry 18 provided between work decks 16 and 17 provided on the side of the rail 7, and a horizontal power transmission connected to the lifting / lowering drive motor 19. And a vertical power transmission mechanism connected to the horizontal power transmission mechanism 20 and provided vertically at four corners of the gantry 18.
21. The vertical power transmission mechanism 21 includes a screw shaft 22 and a lifting nut 23 screwed to the screw shaft 22. A lifting hook 25 is provided on the lifting nut 23 via a bracket 24 so as to be rotatable as indicated by an arrow X. At the same time, a hook-shaped upper claw 27 is provided above the hook portion 26 of the hanging hook 25 so as to rotate as shown by the arrow Y to open and close the opening of the hook portion 26. Then, the rotation center of the hanging hook 25 is provided so as to be located vertically above the hanging shaft 28 provided at the four outer peripheral corners of the connector 1, and the hanging hook 25 is moved by the operation of the lifting drive motor 19. The hook 26 is automatically engaged with and disengaged from the suspension shaft 28 by being moved up and down.

That is, while the small ladle 9 is being carried in by the carriage 6, the hook portion of the connecting / detaching device 2 is in a standby state.
A hanging shaft 28 is engaged with 26, and the connection tool 1 is hung at a position where the hanging hook 25 is raised. When the small ladle 9 is carried in, the lifting hook 25 is lowered by the operation of the elevating drive motor 19, and the mounting surface 11 of the connecting tool 1 is placed on the receiving surface 10 of the small ladle 9. Thereafter, when further descending, the suspension shaft 28 pushes up until it comes off from the upper claw 27 while rotating the upper claw 27, and when it comes off, the upper claw 27 rotates and closes the opening of the hook portion 26, so that After this, the lifting hook 25 is raised and
Can be raised without hooking the suspension shaft 28. On the contrary, when the connecting tool 1 is lifted from the small ladle 9 after the completion of the molten steel processing such as the vacuum processing and the heating processing, the small connecting tool 1 is placed under the connecting / detaching apparatus 2. After loading the ladle 9, the hanging hook 25 is lowered from the raised position. With this lowering, the tip of the upper claw 27 closing the opening of the hook portion 26 is hooked on the hanging shaft 28, and at the same time, the hook portion 26 starts to rotate in the opening direction, and at the same time as the opening, the hanging hook 25 is hooked. It rotates to the position where the part 26 and the suspension shaft 28 engage. Thereafter, the connecting tool 1 can be lifted by raising the hanging hook 25. By lifting the lifting hook 25 in this manner, the hook portion 26 is automatically moved to the hanging shaft 28.
Can be engaged and disengaged.

The vacuum processing apparatus 3 is the same as a conventionally used apparatus, and has a vacuum processing lid 29 which is air-tightly placed on a receiving surface of a large ladle or a receiving surface 8 of the connecting tool 1. Rail 7
The vacuum processing lid 29 is connected to a suction duct 30 communicating with a suction device (not shown). Reference numeral 31 denotes an inner lid having a large number of through holes suspended inside the vacuum processing lid 29, which prevents splash during vacuum processing from jumping out of the ladle.

The heat treatment apparatus 4 is similar to a conventionally used apparatus, and details thereof are omitted from the drawings.
A heat treatment lid placed on the receiving surface of the large ladle or the receiving surface 8 of the connector 1 and an electrode for heating molten steel in the ladle are provided so as to be able to move up and down above the rail 7.

Reference numeral 32 denotes a receiving tray for raising the small ladle 9 which is provided at the four corners on the upper surface of the carriage 6 so as to be able to roll over. When the large ladle is used, it stands up and retracts. Although not shown, an appropriate device such as a drive cylinder and a link mechanism or a rack and a pinion mechanism can be employed.

In the molten steel processing equipment having the above-described configuration, when processing the amount of molten steel within the specified range, the molten steel can be processed using a predetermined large ladle, and when the amount of molten steel is smaller than the specified range, the small ladle 9 can be processed. By placing the connector 1 suspended on the connector attaching / detaching device 2 on the small ladle 9 in the manner described in paragraph [0012], the same molten steel processing procedure as that of the large ladle is used. Can perform vacuum processing and heating processing.
Therefore, there is no need to provide dedicated molten steel processing equipment for a small ladle, and space can be saved and the equipment cost can be reduced. In addition, since the small ladle 9 has a smaller diameter than a large ladle and has a smaller amount of molten steel, vacuum processing and heating Processing can be performed quickly, and a small amount of molten steel can be processed with high productivity. In addition, connection tool 1
Is suspended in the connecting / detaching device 2 and is always on standby, so that the small ladle 9 can be quickly dealt with every time.

[0017]

As described above, according to the molten steel processing equipment using the ladle according to the present invention, the use of the connector allows the single molten steel processing equipment to process the molten steel using the large ladle as well as the small ladle. Molten steel processing with a ladle can be performed with high productivity, and there is no need to provide molten steel processing equipment dedicated to a small ladle, so that space can be saved and equipment costs can be reduced.
In addition, since the connecting tool is lifted by the connecting tool attaching / detaching device and is always on standby, it is possible to quickly cope with the case where a small ladle is used, and also from this aspect, the molten steel processing can be performed with high productivity.

[Brief description of the drawings]

FIG. 1 is an overall schematic explanatory diagram of molten steel processing equipment using a ladle according to the present invention.

FIG. 2 is a sectional front view showing an outline of a vacuum processing apparatus of a molten steel processing facility using a ladle according to the present invention.

FIG. 3 is an explanatory view of a connecting / detaching device of a molten steel processing facility using a ladle according to the present invention, wherein a is a front view and b is a top view.

FIG. 4 is an overall schematic explanatory view of a conventional molten steel processing facility using a ladle.

[Explanation of symbols]

1: Connecting device 2: Connecting device attaching / detaching device
3: Vacuum processing device 4: Heating device 5: Ladle loading / unloading section
6: Bogie 7: Rail 8: Receiving surface
9: Small ladle 10: Receiving surface 11: Mounting surface 1
2: Thick section 13, 14: Cooling water channel 15: Water supply pipe 1
6, 17: Work deck 18: Stand 19: Elevating drive motor 2
0: Horizontal power transmission mechanism 21: Vertical power transmission mechanism 22: Screw shaft 2
3: Lifting nut 24: Bracket 25: Hanging hook 2
6: Hook part 27: Upper claw 28: Hanging shaft 2
9: Vacuum processing lid 30: Suction duct 31: Middle lid 3
2: Raising pedestal X, Y: Arrow indicating rotation direction

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Kenji Kawai 2-3-1 Shinhama, Araimachi, Takasago City, Hyogo Prefecture Inside Kobe Steel, Ltd. Takasago Works (72) Inventor Ryoji Miki 2-3-3, Araimachi Shinama, Takasago City, Hyogo Prefecture No. 1 Kobe Steel, Ltd. Takasago Factory

Claims (1)

[Claims] In a molten steel processing facility using a ladle comprising a vacuum processing device, a ladle loading / unloading section, and a truck running between the vacuum processing apparatus and the ladle loading / unloading section, an upper receiving surface is provided. In addition to having an annular connecting member formed so that the vacuum processing lid can be airtightly received on the receiving surface of the ladle on the lower mounting surface and the lower mounting surface, the connecting device can be mounted on the ladle placed on the cart. A molten steel processing equipment using a ladle, wherein a connecting / detaching device for attaching / detaching to / from a vacuum processing apparatus and a ladle carrying-in / out section are provided.