JPH06184619A - Hanging up type high efficiency molten steel treating equipment - Google Patents

Abstract

PURPOSE:To provide high efficiency molten steel treating equipment, in which the molten steel treatment in each ladle is efficiently executed and rotation cycle time of the treating work can be shortened. CONSTITUTION:This equipment is composed of a hanging-up device 3 for hanging the molten steel ladle 5 with a hook 4 attached to the molten steel treating equipment 1 at a treating position 7 in the molten steel treating equipment 1 on the travelling course of a truck 6 for sending the molten steel ladle before treatment and a truck 6' for removing the molten steel ladle after treatment and two sets of the trucks 6, 6' for carrying the molten steel ladle, freely travelling on the travelling course during hanging-up treatment of the ladle. Further, on the travelling course of the truck 6 for sending the molten steel ladle 5 to the treating position 7 and/or on the travelling course of the truck 6' for removing the molten steel ladle 5 from the treating position 7, the molten steel treating equipments 8, 9 having different to the molten steel treating equipment 1 are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting-type high-efficiency refining facility which is a secondary refining facility installed in a steelmaking plant after tapping of a converter and capable of shortening a processing cycle time. is there.

[0002]

2. Description of the Related Art Conventionally, as this type of high efficiency refining equipment,
The following are (1) high-efficiency turntable type hot metal pretreatment refining method (see Japanese Patent Laid-Open No. 61-3814), and (2) molten steel processing equipment special fair (see Japanese Patent Laid-Open No. 62-17117). , (3) A high-efficiency degassing device (see Japanese Patent Application Laid-Open No. 2-122014) is generally known.

In the high-efficiency turntable type hot metal pretreatment refining method (1) (see FIG. 2), a turntable 20 is provided, which rotates by repeatedly moving and stopping at a predetermined angle on the same circumference. A refining station 21 is arranged on a turntable 20 at every predetermined angle. Then, the hot metal contained in the container installed on the turntable 20
When in the refining station 21, desilvering, dephosphorization, desulfurization,
One or more treatments of slag are carried out to achieve an efficient hot metal pretreatment.

The molten steel treatment device (2) (see FIG. 3) is a ladle.
An apparatus for performing molten steel treatment in a container 22, in which a horizontal orbit is provided above the ladle 22, a carriage for vacuum degassing 23 and a carriage for inert gas bubbling and powder injection 24
Are movably mounted on the orbit independently of each other. Further, a horizontal track is arranged above the ladle 22, and the vacuum degassing carriage 23 and the inert gas bubbling / powder injection carriage 24 are placed so as to be independently movable on the track. I am trying.

The high efficiency degassing device (3) (see FIG. 4) is
The molten steel ladle lifting device 26 provided below the degassing tank on the traveling path of the molten steel ladle transport cart 25 and the molten steel ladle 27 at the degassing treatment position.
The lifting device 30 for hanging the trunnion 28 of the hook 29 with the hook 29 and the two pan receivers 31 are mounted at positions separated from each other by the distance between the yard centers, and are installed inside the underframe so that they can travel even while the molten steel ladle lifting device is operating. It consists of a molten steel ladle transport trolley 25 with an opening.

[0006]

[Problems to be Solved by the Invention]
In the case of (1), the processing time of each station in FIG. 3 may be exactly the same, but if they are different, a problem occurs. That is, since the rotation cycle time of the turntable is synchronized with that of the longest processing time, even if the processing is completed earlier in one station, it waits unnecessarily until the next processing.

[0007] Also, it suffices that all pots process at each station. For example, even if a pot does not require treatment at one station, the structure of the turntable makes it possible to set a predetermined position at that station. I have no choice but to waste time waiting.

On the other hand, the above-mentioned item (2) has an excellent layout when only one of the RH process and the gas bubbling (powder injection) process is sufficient.

However, when different kinds of treatments such as gas bubbling (powder injection) to RH or RH to gas bubbling (powder injection) are required in succession, there is only one treatment position. This is unsuitable from the viewpoint of shortening the cycle time because the next heat pan can be processed only after the two processes are completed. In addition, the molten steel ladle during the moving time of the tank and the moving time of the bubbling equipment is forced to stand by in vain.

On the other hand, in the above (3), although the molten steel ladle is in a suspended state during the processing, a device (hydraulic cylinder) for raising and lowering the molten steel ladle is required until it is hooked, Moreover, since the pan is moved up and down together with the pan receiver, the cart cannot move during the lifting period by the lifting device.
In addition, extra time is required from the lifting by the lifting device to the lifting by the hook, which becomes a factor of increasing the cycle time.

Further, since the lifting device using the hook is installed in the vacuum tank moving carriage, in the case of the twin vessel, two lifting devices are required, and at the same time, the molten steel ladle is hung by the carriage. The load on the vacuum tank frame is too large and the equipment cost is high.

Moreover, although two molten steel ladles are mounted on the trolley, since it is one trolley, if it is desired to continue to carry out other treatments, a crane is used to transport it from the payout position to another treatment position. There is a need to. Therefore, the cycle time increases.

The present invention was devised in view of the above-mentioned circumstances, and the purpose thereof is to enable the molten steel treatment in each pot efficiently and to shorten the rotation cycle time of the treatment work. To provide processing equipment.

[0014]

[Means for Solving the Problems] In contrast to (1) in the prior art described above, the present invention eliminates unnecessary waiting,
Make it clear whether it is treated or not, and prevent it from being mixed (time) with treatment. In order to minimize the cycle time for each heat, it is desirable to have a structure that can rotate freely without being restricted by other pots, but such a turntable is too complicated in structure and suitable for actual operation. Absent. Therefore, such a turntable system is abandoned.

Further, in contrast to (2) in the prior art, in the present invention, the non-processing time from one processing to the next processing is minimized, and while one heat is RH processing, another heat is bubbled. Allows simultaneous processing such as processing.

Furthermore, in contrast to (3) in the prior art,
According to the present invention, the lifting device using the push-up hydraulic cylinder is unnecessary, and the structure is such that the molten steel ladle is lifted by the hook from the beginning.

On the other hand, in addition to the tank frame, an elevating device with hooks is installed at the processing position to absorb the load of the molten steel ladle, thereby simplifying the tank frame. At the same time, the equipment cost is low because the lifting device only needs to be completed. In addition, with the molten steel ladle hoisted by the hook, the trolley can freely move under it.

Further, by using two carriages whose functions are divided into a carriage for feeding to the processing position and a carriage for discharging from the processing position, the non-processing time is minimized, and another type of molten steel is used on the traveling route of the carriage. By installing processing equipment, the total processing cycle time is shortened.

From the above, therefore, according to the high-efficiency molten steel treatment equipment of the present invention (see FIGS. 1 and 2), at the treatment position 7 of the molten steel treatment equipment 1 on the traveling path of the ladle ladle transport carriage 6, The trunnion of the molten steel ladle 5 is hung by the hook 4 and lifted to a height at which it can be processed. It is assumed that the lifting device 3 and the molten steel ladle 5 are composed of two molten steel ladle transport carts 6 and 6'which can freely travel on a traveling route during the lifting process.

At the same time, the treatment equipment is provided on the traveling route of the transport carriage 6 for feeding the molten steel ladle 5 to the treatment position 7 or on the traveling route of the transport carriage 6'for discharging the molten steel ladle 5 from the treatment position 7. Shall carry out successive and continuous high-efficiency molten steel treatment with different types of molten steel treatment equipment 8, 9.

That is, according to the present invention, equipment for processing molten steel in a state in which the molten steel ladle trunnion is suspended by hooks, two molten steel ladle transporting trucks that can freely travel on the traveling route under the furnace in that state, and traveling of the respective carts A molten steel treatment facility of a type different from the molten steel treatment was installed on the route.

While the molten steel ladle is being lifted, the molten steel pot of the next heat is fed on the trolley, or the molten steel pot of the previous heat is laid on the unloading trolley so that the timing of the lifting treatment is not restricted and the ladle can be processed freely. In this way, the cycle time as a sequential processing process is minimized. Also,
Even when the hoisting process is carried out independently, the trolley is fed in during the hoisting process and the cart is returned to the rest position in preparation for the next heat ladle pan setting so that the hoisting process can be waited in the deferred state. Save time.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The lifting type high-efficiency molten steel processing equipment of the present invention will be described below with reference to the illustrated embodiments.

The high-efficiency molten steel treatment facility A (see FIG. 1) is located close to the furnace below the molten steel treatment facility 1 having a lifting device 3 for the molten steel ladle 5 and a vertically movable hook 4 at the lower end (lower side of the furnace). 2) is arranged on the front side of the furnace of the turntable 2 and the molten steel processing equipment 1, and is equipped with a molten steel ladle 5.
The next heat molten steel ladle is provided with a pan feeding dolly 6 and a payout dolly 6'which can travel on rails from the laid position to the hearth.

Then, the feeding carriage 6 is used for the next heat pan 5.
Is carried to the processing position 7 of the turntable 2 and is returned to the pan setting position 10 for mounting the next heat pan 5'after being emptied at this processing position.
Further, the pot 5 carried to the processing position 7 is configured to be lifted by the hook 4 so that molten steel processing work can be performed in the processing facility 1.

Further, the pay-out dolly 6'is caused to travel from the front heat ladle lapping position 11 on the furnace back side to the processing position 7,
Here, after receiving the processed pot 5 by the descending operation of the hook 4, it is configured to return to the winding position 11.

The turntable 2 in this embodiment
Does not pass under the furnace, but is fixed near the front of the furnace, but since the processing equipment 1, the lifting device 3, and the hook 4 project above the turntable 2 in front of the furnace, the pan 5 is hung down. Is possible.

The turntable 2 is used for exchanging the processing equipment 1 (irrelevant to the invention), and is rotated in the forward and reverse directions by rotating means (rails, wheels, central rotating shaft, belt, winder, motor, etc.). Yes, the replacement of the processing equipment 1 in use and the auxiliary processing equipment 1 can be performed, for example, while the processing equipment 1 in use is operating,
Transfer the spare processing equipment 1 onto the processing equipment 8 with a crane.
After waiting (while hanging or using a fixture) to finish the process of 1 in operation, remove it from the exhaust system and the ladle hoisting device 3 and the hook 4 with a crane, and turn on the turntable 2 of the spare process equipment 1. Rotate it to move it to the vicinity of processing position 7, and hang it vertically with a crane to mount it. In addition, it requires skill to carry the auxiliary processing equipment 1 horizontally by a crane.

The use of the high-efficiency molten steel processing equipment A having such a structure is performed as follows.

First, the case of the lifting process alone will be described. First, the molten steel ladle 5 is placed on the ladle feeding cart 6 by a crane (not shown) at the standing position 10. Then, the pan feeding cart 6 is used for other types of molten steel processing equipment 8 (for example, injection equipment using a lance).
Underneath, move to the lifting processing position 7. Next, the molten steel ladle lifting device 3 is lowered to the lower limit, the hooks 4 are hooked on the trunnions of the molten steel ladle 5, and the molten steel ladle lifting device 3 is raised to a processable height.

After that, the empty pot feeding cart 6 became empty.
Return to the deferment position 10 (wait until the next heat steel ladle deferment). Further, the pot payout cart 6'is moved under the molten steel treatment equipment 9 of another type (for example, a temperature raising equipment using a suns) and moved to the lifting treatment position 7.

Next, the lifting process is completed (molten steel process is completed).
Then, the molten steel ladle hoisting device 3 is lowered to the lower limit, and the molten steel ladle 5 is placed on the ladle discharging carriage 6 '.

Then, the pan delivering cart 6'moves to the winding position 11, and the pan feeding cart 6 carrying the next heat molten steel ladle 5'moves from the stationary position 10 to the processing position 7.
At this time, the hook 4 needs to be tilted so as to be hidden by the arm 3a of the molten steel ladle hoisting device 3 so that the carriages 6 and 6'can travel.

Next, the hook 4 is hooked on the trunnion of the next heat molten steel ladle 5 ', and the molten steel ladle lifting device 3 is raised to a processable height. Then, the molten steel treatment using the high-efficiency molten steel treatment equipment A is performed by sequentially repeating such steps.

Therefore, during the period from the end of treatment to the start of the next heat treatment (non-treatment time), the molten steel ladle lifting device 3 is lowered.
0.5 ', the hook 4 tilts 0.2', the pan delivery cart 6'and the pan feed cart 6 move 0.5 ', the hook 4 tilts 0.2', and the molten steel ladle lifting device 3 rises to the processing height. But
With 0.5 ', a total of 1.9 minutes is required, and according to the present invention, it is possible to realize a significant reduction in cycle time as compared with the prior art.

For example, according to Japanese Patent Laid-Open No. 2-122014, the processing time is 25 minutes and the cycle time is 29 minutes, so the non-processing time is 4 minutes, which is about twice as long as the present invention.

On the other hand, the case where another type of molten steel treatment is also used (sequential continuous treatment) will be described.

In this case, in the case of the lifting treatment alone, the steps of the molten steel processing equipments 8 and 9 are added. Here, the case where three different processings of the molten steel processing equipments 8, 1 and 9 are successively carried out. Describe. In addition, molten steel processing equipment 1,
When either processing 8 or 9 is sufficient, it is combined with the above-described case of the lifting processing alone.

First, the molten steel ladle 5 is placed on the ladle feeding cart 6 at the standing position 10. Then, the pan feeding cart 6 is moved to the molten steel processing equipment position of the molten steel processing equipment 8 and the processing of 8 is carried out.

Next, after the processing of the molten steel processing equipment 8 is completed, the pan feeding cart 6 is moved to the lifting processing position 7.

Next, the molten steel ladle lifting device 3 is lowered to the lower limit, the hooks 4 are hooked on the trunnions of the molten steel ladle 5, and the molten steel ladle lifting device 3 is raised to a processable height.

After that, the pot feeding cart 6 which became an empty car
Return to the deferment position 10 (wait until the next heat steel ladle deferment). Further, the pot payout cart 6'is moved under the molten steel treatment equipment 9 of another type (for example, a temperature raising equipment using a suns) and moved to the lifting treatment position 7.

Next, during the lifting process of the molten steel ladle 5,
The pan feeding cart 6 is moved to the position of the molten steel processing equipment of the molten steel processing equipment 8 with the next heat molten steel ladle 5 ′ placed thereon. Then, the next heat molten steel ladle 5 ′ is processed in the molten steel processing equipment 8.

Next, after the lifting process is completed, the molten steel lifting device 3 is lowered to the lower limit, and the molten steel ladle 5 is discharged and placed on the carriage 6 '.

Next, the pot dispensing cart 6'is attached to the molten steel treatment facility 9
The molten steel processing equipment position is moved to the lifting processing position 7 while the pan feeding carriage 6 on which the next heat molten steel ladle 5 ′ of the molten steel processing equipment 8 has been processed is placed.

Then, the molten steel ladle 5 on the ladle-discharging cart 6'performs the processing of the molten steel treatment equipment 9, and the next heat molten steel ladle 5'hangs the hook 4 on the trunnion. Then, the molten steel lifting device 3 is lowered to the lower limit, and the hook 4 is moved to the molten steel ladle 5.
And the molten steel ladle lifting device 3 is raised to a processable height.

Next, after the molten steel ladle 5 on the ladle discharging carriage 6'has been processed by the molten steel treatment equipment 9, it is moved to the hoisting position 11 and hoisted by a crane. After that, the empty pot dispensing cart 6'returns to the processing position 7 in preparation for the next heat dispensing.

These are the points that the three treatment times do not necessarily have to be the same when sequentially performing three different molten steel treatments. This is due to the fact that two carriages can freely travel on the traveling path under the furnace in a state where the molten steel ladle is hung, and is found, for example, in Japanese Patent Laid-Open No. 61-3814. It completely eliminates the drawbacks of the turret method.

As an application field of the present invention, the present invention can be applied to hot metal pretreatment equipment before blowing in a converter.

[0050]

According to the high-efficiency molten steel treatment equipment of the present invention, equipment for performing molten steel treatment with the molten steel ladle trunnion suspended by hooks and two molten steels capable of freely traveling on the under-furnace traveling route in that state By installing a molten steel processing equipment of a different type from the above-mentioned molten steel processing on the pan transport trolley and the traveling route of each trolley, it is possible to efficiently perform the molten steel processing in each pan and the rotation cycle time of the processing work. Can be shortened.

[Brief description of drawings]

FIG. 1 (A) is a schematic plan view showing a lifting type high-efficiency molten steel processing equipment of the present invention, and FIG. 1 (B) is a schematic sectional view taken along line AA of (A).

FIG. 2 is a schematic view showing a conventional molten steel processing facility.

FIG. 3 is a schematic view showing a conventional molten steel processing facility.

FIG. 4 is a schematic view showing a conventional molten steel processing facility.

[Explanation of symbols]

A ... Lifting method High-efficiency molten steel processing equipment, 1 ... Molten steel processing equipment, 2 ... Turntable, 3 ... Molten steel ladle lifting device, 4 ...
Hook, 5 ... molten steel ladle, 6 ... molten steel ladle feeding cart, 6 '... molten steel ladle unloading cart, 7 ... processing device, 8 ... molten steel processing facility,
9 ... Molten steel processing equipment, 10 ... Ladle position of ladle, 11 ... Winding position of pre-heat ladle.

Claims (2)

[Claims] 1. A turntable 2 arranged close to (under the furnace) a molten steel processing facility 1 having a lifting device 3 for a molten steel ladle 5 and a hook 4 which can be raised and lowered at the lower end. Is provided in front of the furnace of the molten steel processing equipment 1,
The molten steel ladle 5 is mounted, and a ladle feeding trolley 6 and a ladle discharging trolley 6'which can travel on rails from the next heat molten steel ladle laying position 10 to the back of the hearth are provided. It is configured to carry the heat pan 5'to the processing position 7 of the turntable (2) and return to the pan setting position 10 in order to mount the next heat pan 5'after becoming empty at this processing position, Further, the pot 5 carried to the processing position 7 is configured to be hoisted by a hook 4 so that molten steel processing work can be performed in the processing equipment 1. Furthermore, the pay-out carriage 6 ′ is located in front of the furnace back side. A hoisting method characterized in that the heating ladle is moved from the hoisting position 11 to the processing position 7, and after receiving the processed pan 5 by the descending operation of the hook 4, it is returned to the hoisting position 11. High efficiency Steel processing equipment. 2. The pan 6 is located at an intermediate position between the turntable 2 and the pot standing position 10, and the pot feeding cart 6 is located below the turntable 2.
A molten steel processing facility 8 configured to be movable,
It is provided at an intermediate position between the turntable 2 and the pan-winding position 11, and is provided with a molten-steel processing facility 9 in which a pan-discharging cart 6'is configured to be movable below the pan-feeding cart 6 Is equipped with a pan 5 and stops after moving to the molten steel processing equipment 8. At the same time, the pan 5 after the molten steel processing is moved to the processing position 7 (on the trolley) of the turntable 2 and the pan 5 is hooked. 4 is constructed so that it can be lifted up by means of 4 and subjected to molten steel treatment in the treatment facility 1, and a pot feeding cart 6 for an empty car during this molten steel treatment.
Is configured to return to the pot resting position 10, mount the next heat pot 5 ', stop after moving to the treatment equipment 8 and perform molten steel treatment, and to mount the next heat pot 5 " ,
It is configured to return to the pot resting position 10, while the pot dispensing cart 6 ′ travels from the hoisting position 11 to the processing position 7, where the processed pot 5 is received by descending the hook 4, and the processing equipment is Stop after moving to 9,
On the other hand, the ladle feeding trolley 6 configured to perform the molten steel treatment of the ladle 5 and equipped with the next heat ladle 5 ′ after the treatment in the treatment equipment 8 moves to the treatment position 7 and is hooked to the next heat ladle 5 ′.
5'is configured so that molten steel can be processed in the processing equipment 1 by lifting it, and the pan 6'equipped with the pan 5 after processing in the processing equipment 9 returns to the pan winding position 11 and the pan 5
It is configured to be able to lift up with a crane, and the empty pot dispensing trolley 6'can be used when the next heat pot 5'being processed in the processing equipment 1 is finished. The lifting-type high-efficiency molten steel processing equipment, which is configured to return to the processing position 7 so as to receive 'and transfer it to the processing equipment 9.