JP2013241634A - Method for transporting molten iron ladle and apparatus for detaching or attaching lid to or from molten iron ladle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the dissipation of heat from a molten iron ladle without forming any lid opening/closing means on a molten iron ladle transport cart.SOLUTION: When a molten iron ladle filled with molten iron discharged from a blast furnace is transported to a converter, the molten iron in the molten iron ladle is transferred to the converter, and the empty molten iron ladle is returned to the blast furnace, the molten iron ladle filled with the molten iron from the blast furnace and not covered with a lid is transported to the converter, the molten iron in the molten iron ladle is transferred to the converter, the empty molten iron ladle is covered with the lid at the predetermined position near the converter, the molten iron ladle kept in this state is transported toward the blast furnace, and the lid is removed from the molten iron ladle at the predetermined position near the blast furnace to make the ladle ready to receive molten iron from the blast furnace.

Description

  The present invention relates to a method for transporting a hot metal ladle for storing hot metal and a lid desorption device for the hot metal pan.

The hot metal discharged from the blast furnace is transported to the converter, and a hot metal ladle is used as a container at that time. After receiving the hot metal in the hot metal ladle, hot metal pretreatment such as dephosphorization and desiliconization is performed in the middle of transporting the hot metal ladle to the converter, but from the viewpoint of reducing CO ₂ emission, There is a need to create a heat margin.

  However, since the hot metal ladle has a large opening area and a large amount of heat dissipation, scrap is introduced in advance before receiving hot metal in the hot metal ladle to reduce the hot metal mixture ratio and produce molten steel. In the dredging operation, the thermal margin is not enough to melt a large amount of scrap by hot metal sensible heat and latent heat.

For this reason, the heat source basic unit for melting scraps increases, leading to an increase in production costs and an increase in CO ₂ emissions.

  As a technique for preventing the heat dissipation of the hot metal in the hot metal ladle, Patent Document 1 discloses that the hot metal ladle transporting carriage is provided with a lid opening / closing means for operating the half lid with a cylinder or the like. A facility has been proposed in which the hot metal pan is covered when the hot metal is transported.

Japanese Patent Laid-Open No. 62-192515

  However, since the size of the hot metal ladle is not single, but the height is different, as in Patent Document 1, when the lid opening / closing means is provided on the hot metal ladle transport carriage, the size of the hot metal ladle must be matched. If the small hot metal ladle is not used, the heat retention efficiency is deteriorated. Moreover, when a bullion is attached to the edge of the pan, the opening / closing means may not operate. In particular, in the hot metal preliminary process performed during the transportation from the blast furnace to the converter, the metal bulge ejected by the process may adhere to the operating part and the lid opening / closing means may not be operated.

  The present invention has been made in view of such circumstances, and a hot metal pan transport method and a hot metal pan lid desorption device that can suppress heat dissipation of the hot metal pan without providing a lid opening / closing means on the hot metal pan transport carriage. It is an issue to provide.

As a result of studies to solve the above problems, the present inventors have obtained the following knowledge.
(1) In Patent Document 1, an attempt is made to suppress heat dissipation from the hot metal itself in the hot metal ladle, but in actuality, the surface area of the hot metal in the hot metal ladle is small and slag is present thereon. The amount of heat released during hot metal transport is not very large. On the other hand, the empty hot metal ladle after injecting hot metal into the converter has a large surface area, and the heat release amount is larger than when hot metal is stored.
(2) When the empty hot metal ladle is transported from the steelmaking factory where the converter is located to the blast furnace, there is no processing, so the lid can be left as it is, and the time loss for attaching and detaching the lid Less is.
(3) Moreover, the time loss can be reduced as much as possible by removing the lid in the blast furnace or attaching the lid in the converter using a dedicated automatic device, and it is safe. In addition, since the operation of removing the lid or attaching the lid is automatically performed by a certain route, it is not applicable to a crane and can be operated by a railway operator without a crane license.

The present invention has been made based on such findings, and provides the following (1) to (6).
(1) The hot metal ladle that received the hot metal discharged from the blast furnace is transported to the converter, the hot metal in the hot metal pot is transferred to the converter, and the hot metal ladle that has been emptied is returned to the blast furnace. There,
The hot metal ladle receiving the hot metal from the blast furnace is transported to the converter without the lid, and the hot metal in the hot metal ladle is transferred to the converter, and then the empty hot metal ladle is placed at a predetermined position near the converter. A method for transporting a hot metal ladle, comprising mounting a lid, transporting the hot metal ladle toward the blast furnace in that state, removing the lid from the hot metal ladle at a predetermined position near the blast furnace, and preparing for receiving in the blast furnace.
(2) At least the removal of the lid is performed by a dedicated lid removal device having a lid transport mechanism that can automatically move based on the information of the position detector. Transport method.
(3) The method for transporting hot metal ladle according to (2) above, wherein the lid removing device is provided on a track of a transport carriage for transporting the hot metal ladle.
(4) A hot metal pan lid detaching device for attaching and detaching the lid to the hot metal pan,
A lid transport mechanism capable of moving up and down and horizontally while holding the lid;
A drive unit for driving the lid transport mechanism;
A position detector for detecting the position of the lid transport mechanism;
A control unit for controlling movement of the lid transport mechanism based on information of the position detector;
A hot metal pan lid detaching apparatus comprising: an operation unit that sends a command to start the lid removal operation or the lid mounting operation by the lid transport mechanism to the control unit.
(5) The lid transport mechanism includes a base that travels along a guide rail provided along a horizontal direction, an elevating part attached to the base, and a lid support part attached to the elevating part. The position detector performs horizontal position detection and height detection, horizontally moves the base, and lifts and lowers the lid support portion by the lifting portion, thereby removing the lid from the hot metal ladle. The hot metal pan lid detaching apparatus according to (4) above, wherein the hot metal pan lid is placed on a lid place outside the hot metal pan, or a lid of the lid place is attached to the hot metal pan.
(6) The hot metal pan lid attaching / detaching device according to (5), wherein the position detector is a limit switch and an encoder provided in the drive unit.

  According to the present invention, since the hot metal ladle after the hot metal is transferred to the converter is covered and transported toward the blast furnace, it is possible to suppress heat radiation from the empty hot metal ladle with a large amount of heat release. The total amount of heat released from the hot metal ladle can be reduced without providing a lid opening / closing means on the hot metal ladle transport carriage. In addition, since the lid is not covered when hot metal is stored in the hot metal ladle, it is not necessary to attach or detach the lid during hot metal preliminary treatment, etc. Since it does not exist, the lid can be left as it is, and time loss for attaching and detaching the lid can be reduced.

  Furthermore, since the lid of the hot metal ladle can be automatically attached and detached by the lid detaching apparatus of the present invention, there is little time loss and it is safe. In addition, the lid detaching apparatus of the present invention is incorporated in the flow process of the production facility and automatically performs the operation of removing the lid or attaching the lid along a certain route. A train operator who does not have it can operate while transporting hot metal ladle. Furthermore, since this lid detaching device is dedicated for attaching and detaching the lid, it does not hinder existing operations.

It is a flowchart which shows the transport method of the hot metal ladle concerning one Embodiment of this invention. It is a schematic diagram which shows the lid | cover removal | desorption apparatus of the hot metal ladle used in the case of transport of a hot metal ladle. It is a figure for demonstrating operation | movement of the apparatus of FIG. It is a figure for demonstrating operation | movement of the apparatus of FIG. It is a figure for demonstrating operation | movement of the apparatus of FIG. It is a figure for demonstrating operation | movement of the apparatus of FIG. It is a figure for demonstrating operation | movement of the apparatus of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a flowchart showing a method for transporting a hot metal ladle according to an embodiment of the present invention.

  First, the hot metal ladle is placed on the transport carriage, and the hot metal from the blast furnace is received in the hot metal ladle (step 1). Next, the hot metal ladle storing the hot metal on the transport carriage is transported toward the converter without a lid (step 2). At this time, the transport carriage travels on a track (railway). Hot metal pretreatment such as dephosphorization and desiliconization is performed during the transport of the hot metal ladle. At this time, since the hot metal ladle is not covered, it is not necessary to attach or detach the lid every time the treatment is performed.

  When the hot metal ladle arrives at the converter, the hot metal stored in the hot metal ladle is transferred to the converter (step 3).

  Thereafter, the hot metal ladle that has been emptied is placed on the transport carriage again, and a lid is attached to the hot metal ladle at a predetermined position near the converter (step 4). At this time, there is a ladle crane for inserting hot metal from the hot metal ladle into the converter at the steelmaking factory where the converter is installed. May be used.

  In this way, the empty hot metal ladle with the lid attached is transported toward the blast furnace by the transport carriage (step 5). Then, when the transport cart reaches a predetermined position near the blast furnace, the lid of the hot metal ladle is removed (step 6). At this time, since there is no crane around the blast furnace, a dedicated automatic lid removing device is provided, and the lid is removed by the lid removing device. The automatic lid removing device is preferably set at a predetermined position on the track on which the transport carriage travels. Thereby, the lid can be removed during the transport of the hot metal ladle.

  The hot metal ladle from which the lid has been removed is transported to the blast furnace by the transport carriage and receives the hot metal again (step 1). In this way, Step 1 to Step 6 are repeated.

  By mounting the lid on the empty hot metal pan in this way, heat dissipation from the hot metal hot pot is suppressed. Patent Document 1 focuses on suppressing heat dissipation in a state where hot metal is stored, but since the surface area of the hot metal in the hot metal pan is small and slag is present on the hot metal surface, hot metal transport is performed. There is not much heat dissipation inside. On the other hand, the empty hot metal ladle after injecting hot metal into the converter has a large surface area, and the heat release amount is larger than when hot metal is stored. In addition, the distance between the converter and the blast furnace is long, and when returning an empty hot metal ladle from the converter to the blast furnace with a transport carriage, for example, a long period of about 40 minutes is required, which results in a very large heat loss. End up.

  Therefore, after transferring the hot metal from the hot metal ladle to the converter, by covering the hot metal pan and returning it to the blast furnace, the total heat radiation can be suppressed, and before the hot metal is received in the hot metal pan Even in the case where low scrap distribution operation is performed by adding scrap in advance, it is possible to create a thermal margin for the hot metal preliminary treatment. In addition, since the hot metal ladle is not covered with the hot metal stored, it is not necessary to attach and detach the cover every time in the hot metal pretreatment, and there is no time loss for attaching and detaching the cover. Further, there is no inconvenience as in the technique of Patent Document 1.

Next, a lid detaching apparatus capable of attaching and detaching the lid to the hot metal ladle during the transport of the hot metal ladle as described above will be described.
FIG. 2 is a schematic view showing such a lid detaching apparatus. This lid desorption device is dedicated to removing the lid at the lid removal location near the blast furnace, and dedicated to the lid installation at the lid installation location near the converter. However, since a ladle crane is provided around the converter, if the lid is mounted by the ladle crane, it is not necessary to use the apparatus shown in FIG.

  The lid detaching apparatus includes a guide rail 11 that is horizontally installed in a state of being supported by the gantry 3 above the hot metal ladles 2a and 2b placed on the transport carriages 1a and 1b, and a lid that travels on the guide rail 11. A transport mechanism 12.

  The lid transport mechanism 12 includes a base 21 that travels on the guide rail 11, an elevating part 22 composed of a wire mechanism attached to the base 21, and a lid support part 23 attached to the tip of the elevating part 22. . The elevating part 22 raises and lowers the lid support part 23 by winding and unwinding the wire rope. The lid support portion 23 has an engagement member 24 that engages with a hook 4a provided on the lid 4 of the hot metal pan.

  The horizontal movement along the guide rail 11 of the base 21 and the up-and-down movement of the lifting unit 22 are performed by the drive unit 13. The drive unit 13 has a drive motor and an encoder. The drive unit 13 is controlled by the control unit 14. The operation unit 15 has operation switches and operation keys for operation start, end, and other operations. When the operator operates these, the command is sent to the control unit 14.

  The guide rail 11 is provided with a limit switch group for controlling the horizontal movement of the lid transport mechanism 12. More specifically, limit switches 31, 32, 33 provided at the standby position of the lid transport mechanism 12, the position corresponding to the hot metal ladle 2a, the position corresponding to the hot metal ladle 2b, and a deceleration command before reaching these positions. Limit switches 34, 35, 36 for taking out and limit switches 37, 38 for defining the left and right limits of the guide rail 11 are provided. The base 21 is provided with two operation portions 41 and 42 for operating these limit switches. The base 21 is provided with an upper limit detector 43 that detects the upper limit of the lid support 23. Further, the lid support portion 23 is provided with a detection bar 44 for detecting the height position of the lid 4. And these detection information is sent to the control part 14, The command is output to the drive part 13 based on it. Reference numeral 5 denotes a lid place.

  In the lid detaching apparatus configured as described above, when the hot metal ladle 2a or 2b placed on the transport carriage 1a or 1b reaches directly below the guide rail 11, the lid 4 is attached or removed.

  For example, when removing the lid 4 attached to the hot metal ladle 2b, the following series of operations are automatically performed by operating the lid removal operation start switch of the operation unit 15.

  First, in a state where the lid support portion 23 is at the upper limit position, the lid transport mechanism 12 is caused to travel on the guide rail 11 from the standby position shown in FIG. 2, and when the operating portion 42 operates the limit switch 36, the speed is decelerated. When the operation unit 41 operates the limit switch 33, the operation unit 41 stops the operation. And it moves to the raising / lowering position shown in FIG. 3 by encoder control.

  In this state, the lid support portion 23 is lowered, decelerated when the detection bar 44 detects the lid 4, and lowered to the hooking position by encoder control. In this state, the lid transport mechanism 12 is moved horizontally by encoder control. As shown in FIG. 4, the engaging member 24 is engaged with the hook 4 a of the lid 4.

  In this state, after the lid support portion 23 is moved to the lid removal position based on the detection of the detection bar 44 and the encoder control, the lid 4 is suspended to the upper limit position shown in FIG. The lid support part 23 is raised.

  When the lid support portion 23 reaches the position shown in FIG. 5, the lid transport mechanism 12 travels toward the standby position on the guide rail 11 and decelerates when the operating portion 41 activates the limit switch 34. When the switch 31 is actuated, it is stopped (see FIG. 6). At this time, as shown in FIG. 6, the lid 4 suspended from the lid support portion 23 is located immediately above the lid storage place 5.

  In this state, the lid support portion 23 is lowered and decelerated at the deceleration position, and the lid 4 is placed at the lid placement position of the lid placement place 5 as shown in FIG. Thereafter, the lid support 23 and the lid transport mechanism 12 are moved to the hook removal position by encoder control to release the engagement between the engagement member 24 and the hook 4a, and then the lid support 23 is raised to the upper limit. Further, the lid transport mechanism 12 is caused to travel to the standby position, and the state returns to the state shown in FIG.

  In addition, when removing the lid | cover 4 of the hot metal ladle 2a, and the operation | movement which attaches a lid | cover to the hot metal ladles 2a and 2b can be performed according to the above operation | movement.

  According to such a lid detaching apparatus, the operator can automatically perform the lid removing operation or the lid mounting operation only by operating the operation start switch of the operation unit 15, so that time loss is small. And it's safe. In addition, the lid detaching device is provided on the track of the transport carriage, and is incorporated in the flow process of the production facility, and automatically performs the operation of removing the lid or attaching the lid on a certain route. The railway operator without a crane license can operate it while transporting the hot metal ladle. Furthermore, since this lid detaching device is dedicated for attaching and detaching the lid, it does not hinder existing operations.

  The present invention can be variously modified without being limited to the above embodiment. For example, in the above-described embodiment, the lid attaching / detaching apparatus performs the lid attaching / detaching operation mainly by the control of the limit switch and the encoder, but other position detectors may be used instead of the limit switch.

DESCRIPTION OF SYMBOLS 1a, 1b Transport cart 2a, 2b Hot metal ladle 3 Stand 4 Lid 4a Hook 5 Lid place 11 Guide rail 12 Lid conveyance mechanism 13 Drive part 14 Control part 15 Operation part 21 Base 22 Lifting part 23 Lid support part 24 Engagement member 31 To 38 Limit switch 41, 42 Actuator 43 Upper detector 44 Detection bar

Claims (6)

A method of transporting a hot metal ladle that receives hot metal from the blast furnace, transports the hot metal in the hot metal ladle to the converter, and returns the empty hot metal ladle to the blast furnace.
The hot metal ladle receiving the hot metal from the blast furnace is transported to the converter without the lid, and the hot metal in the hot metal ladle is transferred to the converter, and then the empty hot metal ladle is placed at a predetermined position near the converter. A method for transporting a hot metal ladle, comprising mounting a lid, transporting the hot metal ladle toward the blast furnace in that state, removing the lid from the hot metal ladle at a predetermined position near the blast furnace, and preparing for receiving in the blast furnace.   The method for transporting hot metal ladle according to claim 1, wherein at least the removal of the lid is performed by a dedicated lid removal device having a lid conveyance mechanism that can automatically move based on information of the position detector.   The method of transporting hot metal ladle according to claim 2, wherein the lid removing device is provided on a track of a transport carriage for transporting the hot metal ladle. A hot metal ladle lid detaching device for attaching and detaching the lid to the hot metal ladle,
A lid transport mechanism capable of moving up and down and horizontally while holding the lid;
A drive unit for driving the lid transport mechanism;
A position detector for detecting the position of the lid transport mechanism;
A control unit for controlling movement of the lid transport mechanism based on information of the position detector;
A hot metal pan lid detaching apparatus comprising: an operation unit that sends a command to start the lid removal operation or the lid mounting operation by the lid transport mechanism to the control unit.   The lid transport mechanism includes a base that travels along a guide rail provided along a horizontal direction, an elevating part that is attached to the base, and a lid support part that is attached to the elevating part. The detector performs horizontal position detection and height detection, horizontally moves the base, and lifts and lowers the lid support portion by the elevating unit, thereby removing the lid from the hot metal ladle. 5. The apparatus for removing and attaching a hot metal ladle according to claim 4, wherein the hot metal ladle is placed on a lid storage place outside the container, or a lid of the lid storage place is attached to the hot metal hot pot.   The said position detector is a limit switch and the encoder provided in the said drive part, The lid | cover removal | desorption apparatus of the hot metal ladle of Claim 5 characterized by the above-mentioned.

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