JP2002256329A - Method for replacing ladle in ladle refining facility and its apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for replacing a ladle in a ladle refining facility and its apparatus with which the operating rate of a degassing-treating facility, etc., is improved and a wide setting space is unnecessary. SOLUTION: The method and the apparatus for replacing the ladle in the ladle refining facility, comprises the process in which an unprocessed ladle B transported from the upstream process is lifted and moved with a crane 6 to the upper part of the standby position for the cart 20a on the rail of the ladle refining facility for standby, the process in which a 2 ladle-carrying cart 20a loaded with a processed ladle A on one loading position 9a comes out from the ladle refining facility 2 and stops at the standby position and then an unprocessed ladle B standing by on an empty loading position 9b is hung down for loading, the process in which the processed ladle A is lifted with the crane and while the crane is moving toward a cart in the downstream, the 2 ladle-carrying cart loaded with the unprocessed ladle B is sent to the ladle refining facility where degassing is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for exchanging a molten steel pot mounted on a bogie entering and exiting a ladle refining facility by traveling on one rail laid between a crane yard and a ladle refining facility. It concerns the device.

[0002]

2. Description of the Related Art Ladle refining equipment is provided between a steelmaking plant and a foundry to degas, heat molten steel, and inject powder into molten steel discharged from an oxygen steelmaking furnace such as a converter. Is performed. The transfer of the molten steel pot between the equipments is performed by moving the bogie along a rail. The rail includes a main rail on which a carrier truck of a steel pan travels, and a pull-in rail which enters and exits a degassing treatment facility. One main rail is laid for each converter, and one pull-in rail is laid for each degassing facility.

[0003] Generally, the retracting rail is provided substantially parallel to the main rail.

When the truck carrying the pot A containing the processed molten steel exits the degassing facility, the pot A is suspended from the truck by a crane on the pull-in rail, and this is transferred to a rail-mounted bogie connected to the downstream process. And transport it to the casting process. Next, the pot B containing the untreated molten steel is lifted from the bogie on the main rail connected to the converter, and this is drawn in and placed on the bogie on the rail. Then, the bogie enters the degassing facility along the drawing rail, and degasses the untreated molten steel (hereinafter, referred to as an untreated pan). A processed molten steel pot (hereinafter, referred to as a processed pot) B is placed on a carriage on a rail leading to a downstream process and transported to the next process.

[0005] However, in the above-mentioned method, a crane is used to suspend the molten steel pot from the bogie on the main rail to the bogie on the service line, and the transfer of the pot from the bogie on the service line to the bogie on the rail connected to the downstream process. The re-hanging time becomes longer. For this reason, there is a problem that the pot containing the untreated molten steel is kept on the bogie of the main rail for a long time, and the operation rate of the degassing equipment is low.

Japanese Patent Application Laid-Open No. 7-41821 proposes to solve the above problem as follows. This is to provide two intersecting lines underneath the degassing equipment, and when the bogie of one of the entraining lines enters the degassing equipment, the untreated pan is craneed to the bogie of the other. This reduces the waiting time before starting the degassing process.

[0007]

However, when two service lines are laid as in Japanese Patent Application Laid-Open No. Hei 7-41821, the laying work cost is high and a large space is required. In addition, there is a problem that inspection is difficult because the service lines cross right below the degassing equipment, and if a problem occurs at the intersection, it takes time to recover and the equipment operation rate decreases. There is.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of replacing a ladle refining facility which does not require a large installation space, and which improves the operation rate of a degassing facility and the like and a facility therefor.

[0009]

The present invention achieves the above object by the following method and apparatus.

[0010] The method of claim 1 is a ladle refining equipment ladle exchanging method for performing degassing treatment of molten steel while exchanging a treated pan and an untreated pan placed on a cart, wherein the ladle is conveyed from an upstream process. The process of lifting the unprocessed pot B with a crane, moving it above the stand-by position of the truck on the ladle refining rail, and waiting, and the two-pan-mounted cart with the treated pot A placed on one mounting position, After coming out of the equipment and stopping at the standby position, the step of hanging down the untreated pot B waiting at the other empty loading position and loading the same, and the step of lifting the treated pot A with a crane, and the crane is used as a bogie in the downstream process This is a method for replacing ladle in a ladle refining facility, which includes a step of sending a two-panel loading cart loaded with an untreated pan B to a ladle refining facility while moving, and performing a degassing process or the like.

According to this method, the waiting time from the end of the degassing process of the front pan to the subsequent pan entering the degassing facility can be greatly reduced. As a result, the amount of heat released from the molten steel during the waiting time can be reduced, and the number of pots (capacity of molten steel: 320 t) that can be processed by the degassing treatment equipment increases (130 to 160 pans / month).

[0012] The apparatus according to claim 2 has one rail laid between the crane yard and the ladle refining equipment, and a bogie running along the rail and capable of simultaneously mounting two pans. This is a ladle exchanging device for ladle refining equipment.

By using this apparatus, the waiting time from the end of the degassing processing of the front pan to the subsequent pan entering the degassing equipment can be greatly reduced. As a result, the amount of heat released from the molten steel during the waiting time can be reduced, and the number of pots (capacity of molten steel: 320 t) that can be processed by the degassing treatment equipment increases (130 to 160 pans / month). Also, since only one rail is required, there is no need to provide a large space as in JP-A-7-41821.

According to a third aspect of the present invention, there is provided an apparatus having one rail laid between a crane yard and a ladle refining facility, and two pan cradles running along the rail. A pot exchange device for a ladle refining facility, comprising a bogie on which two pans cannot be mounted at the same time, and a pan receiving stand elevating means provided between the rails of a crane yard.

By using this apparatus, the waiting time from the end of the degassing process of the front pan to the subsequent pan entering the degassing facility can be greatly reduced. As a result, the amount of heat released from the molten steel during the waiting time can be reduced, and the number of pots (capacity of molten steel: 320 t) that can be processed by the degassing treatment equipment increases (130 to 160 pans / month). This device also
Pots that can be loaded with 2 pots but have a large molten steel capacity (eg 32
(0t capacity) at the same time, if there is an existing bogie with insufficient strength of the bogie frame, the pan replacement method of the present invention can be realized only by attaching the pan receiving stand elevating means. is there. Also, since only one rail is required, there is no need to provide a large space as in JP-A-7-41821.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a layout diagram of a pot transfer facility for degassing. In the figure, 1 is a crane yard, and 2 is a degassing treatment facility provided adjacent to the crane yard 1. In the crane yard 1, a pot containing molten steel discharged from the converter is placed on a crane yard 1 by a bogie.
A rail containing the molten steel to be degassed from a stand-by position in the crane yard 1 and a rail (a non-treated pan) carried under the degassing tank, and a pan containing the degassed molten steel. Rails 4 for carrying the treated pot (called a treated pot) to a standby position in the crane yard 1 and rails 5a and 5b for carrying the treated pot to a continuous casting facility are laid.

The truck 8 carries the pan 12 containing molten steel discharged from the converter and runs on the rail 3. The trolley 9 is a trolley on which two pans 12 and 12 can be mounted, and runs on the rail 4 with an untreated pan or a processed pan mounted thereon. The carriage 10 travels on the rail 5a with the treated pot mounted thereon. The trolley 11 carries the treated pan and runs on the rail 5b.
In addition, the above-mentioned trolley and the trolley described hereinafter mean a trolley which can be driven by itself or a trolley which is towed by a locomotive.

The crane 6 travels in the crane yard 1 and moves the untreated pot 12 from the trolley 8 to the trolley 9,
2 is transported from the trolley 9 to the trolley 10 or the trolley 11.

The degassing tank 7 of the degassing equipment 2 is an operating tank, and the degassing tanks 7a and 7b are spare tanks. Each of the degassing tanks 7, 7a and 7b can be moved between the operating position and the standby position as indicated by arrows to replace the operating tank and the spare tank when repairing the operating degassing tank. Has become.

Next, a method of replacing a pot for degassing or the like in the above-described pot transfer facility will be described. (1) The untreated pot A mounted on the carriage 8 and conveyed from the converter to the crane yard is lifted by the crane 6, transported, and placed on the mounting position 9a of the carriage 9 equipped with two pans. (2) The carriage 9 is moved, the untreated pot A at the mounting position 9a is positioned below the degassing tank 7, and the untreated molten steel is degassed. (3) The untreated pot B, which is mounted on the carriage 8 and conveyed from the converter to the crane yard, is lifted by the crane 6, moved to a position above the stand-by position of the rail 4, and stands by. (4) The treated pot A after the degassing process is put on the carriage 9 and comes out to the standby position of the rail 4. The unprocessed pot B suspended by the crane 6 and put on standby is placed on the mounting position 9b. (5) The processed pot A at the mounting position 9a of the carriage 9 is lifted by the crane 6 and placed on the carriage 10 stopped at the standby position of the rail 5a. During this time, the carriage 9 is moved to the
The untreated pot B is positioned below the degassing tank 7, and the untreated molten steel is degassed. The cart 10 passes the processed pot A to the continuous casting facility and returns to the standby position of the rail 5a. (6) The untreated pot C mounted on the carriage 8 and conveyed from the converter to the crane yard is lifted by the crane 6, moved to a position above the stand-by position of the rail 4, and stands by. (7) The treated pan B that has been degassed is put on the carriage 9 and comes out to the standby position of the rail 4. The untreated pot C suspended by the crane 6 and put on standby is placed on the mounting position 9a. (8) The processed pot B at the mounting position 9b of the carriage 9 is lifted by the crane 6 and placed on the carriage 11 stopped at the standby position of the rail 5b. During this time, the carriage 9 is moved to the
The untreated pot C of a is positioned below the degassing tank 7, and the untreated molten steel is subjected to degassing and the like. The cart 11 passes the processed pot B to the continuous casting facility, and returns to the standby position of the rail 5b.

Thereafter, the treated pot C is the same as the pot A,
After the process (4) and the process (5), it is transported to the continuous casting facility.

That is, in the degassing treatment equipment, the exchange between the untreated pot and the treated pot is carried out as follows using a two-panel mounted cart: see FIG. The untreated pot B transported from the upstream process (converter)
It is lifted by the crane 6 from the cart 8, moves above the standby position of the degassing rail, and waits: (S1). The treated pot A comes out of the degassing processing equipment on the trolley 9 on which two pots can be mounted and comes out to the standby position: (S2). The untreated pot B waiting on the empty loading position of the cart 9 is placed: (S3). The processed pot A is lifted by the crane 6 and placed on the cart 10 or 11. Thereafter, the cart 10 or 11 transfers the processed pot A to the downstream process (continuous casting facility). During this time, trolley 9
Moves to the degassing facility, where the molten steel in the untreated pan B is subjected to degassing and the like: (S4).

After that, the untreated pots C, D,... Conveyed from the upstream process (converter) become processed pots through the above-mentioned steps and are conveyed to the downstream process (continuous casting equipment).

As described above, using the two-panel mountable cart traveling on one degassing treatment rail,
The waiting time from the end of the degassing process of the front pot to the end of the subsequent pot entering the degassing facility was reduced from 13.2 minutes on average to 5 minutes. As a result, the amount of heat released from the molten steel during the waiting time can be significantly reduced, and the number of pots (the molten steel capacity: 320 tons) that can be processed by the degassing equipment by shortening the waiting time is 130 to 1
Increased by 60 pots / month.

Next, a description will be given of an apparatus for carrying out the above-mentioned method of replacing a pot. FIG. 3 is a conceptual diagram of a bogie that can be mounted with two pans. In this figure, a bogie that can simultaneously mount two pans with a molten steel capacity of 320 tons and two pan trays are provided.
2 pots (capacity of molten steel: 320)
The carts that cannot be equipped with t) are also displayed.

First device: This device comprises two pan rests 2
A trolley 20 having 1a and 21b and capable of simultaneously mounting two pots
a, and a degassing rail 4 on which the bogie 20a runs between the standby position of the crane yard 1 and the bottom of the degassing tank 7. Instead of the truck 20a, two trucks having one pot receiving stand may be connected.

Second device: Although this device has two pan receivers, an example in which a bogie in which two pans (capacity of molten steel: 320 t) cannot be simultaneously mounted due to insufficient strength of the bogie is used. It is.

This apparatus has two pan receivers, and a truck 20b in which two pans cannot be loaded simultaneously, and a crane yard 1
The untreated pot is placed between the degassing rail 4 in which the bogie 20b runs between the standby position and the degassing tank 7 and the rail of the degassing rail 4 laid at the standby position. The pan support (21a or 21b) is slightly raised upward from the upper surface of the trolley frame having the running wheels, or the pan cradle is lowered, and the pan cradle elevating means 30 for placing the pan cradle on the upper surface of the trolley frame includes: It is equipped.

The pan holder raising / lowering means 30 is arranged as follows. As shown in FIG. 4, the standby position (see FIG. 1)
Between the rail foundation beam 4a and the rail foundation beam 4b of the rail 4
A concrete layer 33 is formed, and the concrete layer 33
The steel slab plate 34 is disposed on the upper surface of the
The floor is formed so that it can receive the weight of the pan support 21a or 21b. A plurality of hydraulic jacks 31 are mounted on the upper surface of the steel slab plate 34 and on the left and right in the width direction of the rail with the rod facing upward. A receiving plate 32 for receiving the lower surface of the pan receiving table 21 is attached to the rod head of the hydraulic jack 31.

Next, a method of replacing a pot by the above-described apparatus of the second embodiment will be described. (1) Referring to FIG. 3, the processed pot A is placed on the pan receiver 21 a, and the truck 20 b with the empty pan receiver 21 b comes out of the degassing equipment to the standby position of the rail 4. (2) When the empty pan receiver 21b is positioned on the pan receiver raising / lowering means 30, the limit switch is activated and the carriage 20
b stops automatically. (3) When the bogie 20b automatically stops, the receiving plate 32 is raised by the hydraulic jack 31 of the pan receiving stand elevating means 30, and the receiving plate 32 slightly moves the empty pan receiving base 21b upward and away from the upper surface of the bogie frame 22. When the height level (ascending limit) is reached, the operation of the hydraulic jack 31 stops, and the receiving plate 32
Stops rising. At this time, the speed of the jack 31 is automatically switched between high speed and low speed to reduce the time required for the rod of the jack 31 to rise.

Thereafter, a plurality of stoppers 35 for preventing fall are formed.
When the receiving plate 32 is inserted and stopped under the receiving plate 32 and the receiving plate 32 descends due to a failure of the hydraulic jack 31 or the like, the receiving plate 32 is supported, and the load of the untreated pot B described later is applied to the bogie frame 22. Is to be prevented. In addition, an interlock circuit is provided to prevent an operation error so that the carriage 20b cannot run when the receiving plate 32 starts to rise. In addition, when the receiving plate 32 stops at the upper limit height, an indicator light that tells the crane driver that the pan can be hung is lit. (4) Although not shown, at this time, the crane 6 (FIG. 1) which stands by waiting the unprocessed pan B above the standby position of the rail 4
However, the untreated pot B is suspended and placed on the pan receiving stand 21b.

At this time, the processed pot A is placed on the pot receiver 21a of the cart 20b, and the unprocessed pot B is placed on the pot receiver 21b. Therefore, as shown in FIGS. 5 and 6, an optical sensor including light emitters 36a and 36b and light receivers 37a and 37b is provided on both sides of the rail 4 to detect the loaded state of the pot. When the treated pot A and the untreated pot B are detected, an interlock circuit is provided to prevent the hydraulic jack 31 from descending, thereby preventing the bogie 20b from being broken due to an operation error. (5) The crane 6 lifts the processed pot A in the pot receiving stand 21a, and starts moving toward the cart that transports the pot to the downstream process. (6) When the optical sensor detects that the processed pot A is not on the trolley 20b, the drop prevention stopper 35 returns to the drawing limit. At the same time, the hydraulic jack 31 descends, and the pan receiving table 21b on which the unprocessed pan B is placed rests on the upper surface of the bogie frame 22. Thereafter, the lowering operation of the hydraulic jack 31 continues, and when the upper surface of the receiving plate 32 reaches a lowering limit separated by a predetermined distance from the lower surface of the pan receiving stand 21b, the hydraulic jack 3 is moved.
The descending operation of 1 stops.

In order to prevent an operation error, an interlock circuit is provided so that the carriage 20b cannot travel until the receiving plate 32 reaches the lower limit. (7) The cart 20b places the untreated pot B and enters the degassing facility. This completes the replacement of the processed pot A and the unprocessed pot B.

By using the above-mentioned first and second devices, the untreated pot can be sent to the degassing equipment in a short time after the treated pot is lifted by the crane. As a result, the waiting time from the end of the degassing process of the front pan to the subsequent pan entering the degassing facility is greatly reduced,
The amount of heat released from the molten steel during the waiting time can be reduced. In addition, shortening the waiting time increases the number of pots (capacity of molten steel: 320 t) that can be processed by the degassing equipment (130 to 160 pots / month).

In particular, the second device can be mounted in two pans, but if there is an existing bogie whose strength of the bogie frame is insufficient for simultaneous loading of pans having a large molten steel capacity (eg, 320 t capacity), Since the method of replacing a pot according to the present invention can be realized only by attaching the cradle elevating means, the equipment cost to invest is low.

The above-described ladle replacement method and apparatus can also be applied to other ladle refining facilities that perform processing similar to degassing processing equipment.

[0037]

According to the present invention, the following effects can be obtained.

According to the method of the first aspect, the waiting time from the end of the degassing processing of the front pan to the subsequent pan entering the degassing equipment can be greatly reduced. As a result, the amount of heat released from the molten steel during the waiting time can be reduced, and the number of monthly pots that can be processed by the degassing equipment increases.

According to the apparatus of the second and third aspects, the waiting time from the end of the degassing process of the front pan to the subsequent pan entering the degassing facility can be greatly reduced. This makes it possible to reduce the amount of heat released from the molten steel during the waiting time,
In addition, the number of pots that can be processed by the degassing equipment per month increases. In particular, the device of claim 3 can be mounted on two pots,
If there is an existing bogie with insufficient strength of the bogie frame to simultaneously load a pan with a large molten steel capacity, the pot replacement method of the present invention can be realized simply by attaching the pan receiving stand elevating means. Is cheaper.

[Brief description of the drawings]

FIG. 1 is a layout view of a pot transfer facility for degassing according to the present invention.

FIG. 2 shows a flowchart of the method of the present invention.

FIG. 3 is a conceptual diagram of a truck capable of mounting two pots according to the present invention.

FIG. 4 is a front view showing a pan receiving stand elevating means according to the present invention.

FIG. 5 is a plan view showing an attached state of an optical sensor for detecting a pot placed on a cart.

FIG. 6 is a view as viewed in the direction of arrows AA in FIG. 5;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Crane yard 2 Degassing treatment equipment 3, 4, 5a, 5b Rail 6 Crane 7 Degassing treatment tank 8, 10, 11 Bogie 9 bogies (2 pans can be mounted) 9a, 9b Pan mounting position 12 Pans 20a bogies (2 20b trolley (there are two pan cradles, but not two pan cradles) 21, 21a, 21b pan cradle 22 bogie frame 30 pan cradle elevating means 31 hydraulic jack 32 receiving plate 33 concrete layer 34 steel Slab plate 35 Fall prevention stopper 36a, 36b Emitter 37a, 37b Receiver

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Masanori Yamagishi, 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Inside Nihon Kokan Co., Ltd. (72) Hiroyuki Hiji 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. F-term (reference) 4E014 HA01 HA02 HA03 4K013 CF11

Claims (3)

[Claims] 1. A ladle refining equipment ladle replacement method for performing degassing treatment of molten steel while exchanging a treated ladle and an untreated ladle placed on a cart, wherein the untreated ladle B conveyed from an upstream process is removed. The process of lifting with a crane, moving above the stand-by position of the truck of the ladle refining rail, and waiting, and the two-pan-mounted truck with the treated pan A placed at one of the mounting positions emerges from the ladle refining facility. After stopping at the standby position,
The step of hanging down the untreated pot B waiting at the other empty loading position and loading the untreated pot B, lifting the treated pot A with a crane, and loading the untreated pot B while the crane is moving to the bogie in the downstream process. Sending the two-panel-mounted cart to the ladle refining facility and performing degassing treatment and the like. 2. A rail laid between a crane yard and a ladle refining facility, traveling along the rail, and
A ladle refining equipment ladle exchanging device, comprising a dolly capable of simultaneously mounting two ladles. 3. A rail laid between a crane yard and a ladle refining facility, traveling along the rail, and
A ladle refining facility characterized by having a bogie having two pan receivers but not capable of simultaneously mounting two pans, and a pan receiver elevating means provided between the rails of a crane yard. Pot changing device.