Device for vacuum upper injection of multiple steel ingots

Abstract

The utility model relates to a device for pouring multiple steel ingots in vacuum, which comprises a steel ladle, a sealing seat ring, a casting platform, a flow divider, a flow dividing runner and an ingot mould device, the steel ladle is hermetically connected with the sealing seat ring, the sealing seat ring is hermetically connected onto the casting platform, a flow guiding sand groove is arranged inside the sealing seat ring, a vacuumizing pipe is arranged on the side wall of the sealing seat ring, and the ingot mould device is arranged on the casting platform. A flow divider is arranged on the casting platform below the steel ladle, the flow divider is opposite to a steel outlet of the steel ladle, the flow divider is connected with a plurality of flow dividing pouring gates, the flow dividing pouring gates are connected with the ingot mould device in a sealed mode, an inner cavity of the sealing seat ring is communicated with the ingot mould device through an air guide pipe, and the ingot mould device is arranged on the base plate. According to the utility model, a plurality of small and medium-sized steel ingots are poured in vacuum by adopting a mode of sealing the die cavity and the shunting pouring gates, so that the production efficiency is improved, the comprehensive yield is improved and a plurality of metal cast ingots with compact internal tissues can be poured at one time under the condition of giving play to the advantages of top pouring.

Description

Technical Field

[0001] The utility model relates to the field of metal ingot preparation, in particular to a device and method for vacuum pouring multiple steel ingots. Background Art

[0002] Currently, mold casting remains the primary forming method for some specialty steel ingots. Most small and medium-sized specialty steel ingots are cast using bottom-up pouring. The main advantage of bottom-up pouring is that multiple ingots can be cast simultaneously through a center-pour pipe. Compared to single-cast large ingots, this improves casting efficiency, facilitates slag removal, and enhances surface quality. However, during the bottom-up pouring process, the center of the ingot remains at the highest temperature from bottom to top. Solidification only begins after pouring is complete, leading to significant shrinkage in the center of the ingot and insufficient center-feeding. This can cause problems such as coarse core microstructure, severe segregation, porosity, and excessive shrinkage porosity. In contrast, during top-up pouring, since the molten steel is injected from the top, solidification begins in the lower portion of the ingot during pouring, leaving the high-temperature zone confined to the upper center. By the time pouring is complete, the lower and middle portions of the ingot have solidified, leaving only the upper portion unsolidified. Consequently, less steel feeding is required, resulting in less porosity, shrinkage porosity, and segregation. Especially for slender ingots with large aspect ratios, the amount of molten steel shrinkage required is reduced, the riser is small, the yield rate is high, and the internal quality is excellent. However, during top-pouring, the molten steel stream is scattered, slag inclusions are difficult to float up, and the surface quality is poor. To leverage the advantages of each and improve ingot quality, Patent Document 201420845836.7 proposes a vacuum casting device for multiple ingots in a single ladle. Using a tundish and a stopper as intermediate equipment, molten steel is poured directly into multiple ingot molds arranged within a vacuum chamber, eliminating the shortcomings of bottom-pouring and enabling a multi-ingot top-pouring process. Patent Document 200710156115.X proposes an apparatus and process for casting multiple ingots using a molten steel vacuum overflow method. This method produces multiple ingots by pouring a single ingot into a vacuum chamber and then overflowing it into other ingot molds. This method offers advantages such as high production efficiency and excellent internal quality. Patent document 200720106748.5 proposes an integrated method and device for vacuum ladle degassing and vacuum casting of multiple steel ingots, in which the LF furnace and multiple ingot molds are placed in a vacuum chamber. After smelting is completed, the pouring order is changed by rotating the ingot plate to achieve sequential casting of multiple steel ingots, making full use of the advantages of pouring and improving the pouring efficiency. However, the above methods all require large and complex vacuum devices, and the sequential casting of multiple steel ingots also has problems such as rapid steel temperature drop and difficulty in controlling the casting temperature of the front and rear ingots. JP201339588A provides a method for vacuum pouring steel ingots, in which the ladle is placed outside the vacuum chamber and the ingot mold is placed in the vacuum chamber, and a sealing valve body and a stopper rod are used between the two to control the vacuum degree. However, this method can only be used to cast a single large steel ingot, and cannot be used to cast multiple small and medium-sized steel ingots. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to provide a device for vacuum pouring multiple steel ingots, which greatly improves the internal quality of the steel ingots, increases the steel ingot yield rate and reduces production costs.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A device for vacuum pouring multiple steel ingots comprises a ladle, a sealing seat ring, a casting platform, a diverter, a diverter runner, and an ingot mold device. The ladle is sealedly connected to the sealing seat ring, which is sealedly connected to the casting platform. A drainage sand trough is provided inside the sealing seat ring, and a vacuum tube is provided on the side wall of the sealing seat ring. A diverter is provided on the casting platform below the ladle, and the diverter is opposite to the steel outlet of the ladle. A plurality of diverter runners are connected to the diverter, and the diverter runners are sealedly connected to the ingot mold device. The inner cavity of the sealing seat ring and the ingot mold device are connected via an air guide tube, and the ingot mold device is placed on a chassis.

[0006] The steel outlet is provided with a sliding water nozzle.

[0007] The drainage sand trough is connected to the slag receiving hydraulic cylinder outside the sealing seat ring.

[0008] The ladle and the sealing seat ring are sealed with a sealing rubber gasket.

[0009] The diverter is placed at the center of the sealing seat ring and connected with the casting platform by bolts. The inner lining of the diverter is diverter bricks.

[0010] The diversion runner includes an inclined runner and a straight runner. The inner linings of the inclined runner and the straight runner are runner bricks. The runner bricks are connected to the diversion bricks in the diverter by a male-female joint.

[0011] The ingot mold device includes an ingot mold body and a sealing cover plate. The ingot mold body and the sealing cover plate are connected by a hook device. The sealing cover plate is connected to a slag pot, which is filled with protective slag. A discharge switch is provided on the discharge port of the slag pot. An insulating plate is provided on the inner side of the mold opening of the ingot mold body, and the outside of the ingot mold body is connected to a mold ear.

[0012] Compared with the existing technology, the beneficial effects of the utility model are:

[0013] The utility model adopts the method of sealing mold cavity and diversion runner to realize vacuum casting of multiple small and medium-sized steel ingots, which improves production efficiency and comprehensive yield rate while giving full play to the advantages of top casting. It can cast multiple metal ingots with dense internal structure at one time. The specific advantages are:

[0014] 1) The utility model adopts a sealed mold cavity, a diverter and a diverter runner to realize vacuum pouring of multiple small and medium-sized steel ingots. Without reducing production efficiency, it can greatly reduce the gas in the steel, reduce the gas content in the steel, and improve the purity of the molten steel.

[0015] 2) The utility model replaces the lower pouring method with the upper pouring method, adopts the diverter and the diverter runner to replace the center pouring pipe, saves a large number of pouring pipe bricks, saves the solidified molten steel in the center pouring pipe and the runner during lower pouring, and thus greatly improves the utilization rate of the molten steel.

[0016] 3) The utility model adopts the top pouring method to pour molten steel, and can control the flow of the ingot body and the riser by controlling the sliding water gate, which can greatly improve the solidification rate of the core of the ingot and realize sequential solidification from bottom to top, thereby reducing defects such as looseness, shrinkage, segregation and coarse grains in the core, and greatly reducing the volume of the riser, thereby improving the yield rate of the ingot. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of the present utility model.

[0018] Figure 2 It is a top view of the utility model.

[0019] Figure 3 It is a partial schematic diagram of the utility model.

[0020] In the figure: ladle 1, drainage sand trough 2, diverter 3, slag receiving hydraulic cylinder 4, diverter brick 5, diverter runner 6, inclined runner 7, straight runner 8, runner brick 9, sealing cover plate 10, insulation board 11, ingot mold body 12, chassis 13, hook device 14, unloading switch 15, slag pot 16, protective slag 17, casting platform 18, air guide pipe 19, vacuum tube 20, sealing seat ring 21, sealing gasket 22, sliding gate 23, mold ear 24. DETAILED DESCRIPTION

[0021] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means more than two.

[0023] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0024] like Figure 1-Figure 3 A device for vacuum pouring multiple steel ingots, comprising a ladle 1, a sealing seat ring 21, a casting platform 18, a diverter 3, a diverter runner 6, and an ingot mold device. The ladle 1 is sealed with the sealing seat ring 21, and the sealing seat ring 21 is sealed on the casting platform 18. A drainage sand trough 2 is provided inside the sealing seat ring 21, and a vacuum tube 20 is provided on the side wall of the sealing seat ring 21. A diverter 3 is provided on the casting platform 18 below the ladle 1, and the diverter 3 is opposite to the steel outlet of the ladle 1. Several diverter runners are connected to the diverter 3, and the diverter runner 6 is sealed with the ingot mold device. The inner cavity of the sealing seat ring 21 and the ingot mold device are connected through an air guide pipe, and the ingot mold device is placed on the chassis 13.

[0025] The tapping port is provided with a sliding water gate 23 .

[0026] The drainage sand trough 2 is connected to the slag receiving hydraulic cylinder 4 outside the sealing seat ring 21. Through the control of the slag receiving hydraulic cylinder 4, it can advance to the bottom of the ladle outlet, receive the drainage sand when pouring, and then retreat to prevent the drainage sand from entering the ingot mold body 12.

[0027] The ladle 1 and the sealing seat ring 21 are sealed with a sealing rubber gasket 22 .

[0028] The diverter is placed at the center of the sealing seat ring 21 and is connected to the casting platform 18 by bolts. The diverter 3 is lined with diverter bricks 5.

[0029] The diverter runner 6 includes an inclined runner 7 and a straight runner 8. The inner lining of the inclined runner 7 and the straight runner 8 is a runner brick 9. The runner brick 9 is connected to the diverter brick 5 in the diverter 3 by a male-female joint.

[0030] The ingot mold device includes an ingot mold body 12 and a sealing cover plate 10. The ingot mold body 12 and the sealing cover plate 10 are connected by a hook device 14, which seals the sealing cover plate 10 and the ingot mold 12. The sealing cover plate 10 is connected to a slag pot 16, which contains protective slag 17. The discharge port of the slag pot 16 is provided with a discharge switch 15. The inner side of the mold opening of the ingot mold body is provided with an insulation plate 11, and the outside of the ingot mold body is connected to the mold ear 24.

[0031] A casting method for a device for vacuum pouring multiple steel ingots comprises the following steps:

[0032] 1) Vacuuming: Place the ladle 1 on the sealing seat ring 21, and form a sealed cavity between the bottom of the ladle 1, the sealing seat ring 21, the casting platform 18, the diverter 3, the diverter runner 6, the sealing cover plate 10 and the mold cavity of the ingot mold 12; turn off the electric switch 15 at the bottom of the slag pot 16, add protective slag 17 into the slag pot 16, and use a vacuum pump to evacuate the entire cavity through the vacuum pipe 20 to a vacuum degree of 10 -2 ~20.0Pa;

[0033] 2) Pouring: Open the slag receiving hydraulic cylinder 4, push the drainage sand trough 2 to the bottom of the steel outlet, open the sliding water gate 23, flush the drainage sand into the drainage sand trough 2, and return the drainage sand trough 2 after the molten steel is clean. The molten steel flows into the ingot mold body 12 through the diverter and the diversion runner. When the pouring is completed, stop vacuuming, turn on the electric switch 15, and spray the protective slag 17 onto the surface of the molten steel. After the slag spraying is completed, turn off the electric switch 15, and the vacuum tube 20 continues to vacuum until the ingot solidifies;

[0034] 3) Demolding: After the molten steel inside the ingot mold body 12 is completely solidified, stop vacuuming, remove the diverter runner 6, the casting platform 18, and the sealing cover plate 10, and perform the demoulding operation.

[0035] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, and these simple modifications all fall within the scope of protection of the present invention. It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner unless there is any contradiction. In order to avoid unnecessary repetition, the present invention will no longer describe various possible combinations separately. In addition, the various different embodiments of the present invention can also be arbitrarily combined, and as long as they do not violate the idea of ​​the present invention, they should also be regarded as the contents disclosed by the present invention.

[0036] To make the purpose, technical solution, and technical effects of the present invention more clearly understood, the technical solutions in the embodiments of the present invention are now described clearly and completely. However, the embodiments described below are only a portion of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art without inventive effort in conjunction with the embodiments of the present invention are also within the scope of protection of the present invention.

[0037] Example 1

[0038] A device for vacuum pouring multiple steel ingots includes a ladle 1, a sealing seat ring 21, a casting platform 18, a diverter 3, a diverter runner, and an ingot mold device. The ladle 1 is sealed to the sealing seat ring 21, and a sealing rubber gasket 22 is used to seal the ladle 1 and the sealing seat ring 21. The sealing seat ring 21 is sealed to the casting platform 18, and a drainage sand trough 2 is provided inside the sealing seat ring 21. The drainage sand trough 2 is connected to the slag receiving hydraulic cylinder 4 outside the sealing seat ring 21. A vacuum pipe 20 is provided on the side wall of the sealing seat ring 21. A diverter 3 is provided on the casting platform 18 below the ladle 1. The diverter 3 is opposite to the steel outlet of the ladle 1 and is provided with a sliding water gate 23. The diverter 3 is connected to the casting platform 18 with bolts and is lined with diverter bricks 5.

[0039] Four diverter runners are connected to the diverter 3. The diverter runner 6 includes an inclined runner 7 and a straight runner 8. The inclined runners 7 and straight runner 8 are lined with runner bricks 9, which connect to the diverter bricks 5 in the diverter 3 using a male-female joint. The diverter 3 and diverter runners 6 are made of ordinary carbon steel, while the diverter bricks 5 and runner bricks 9 are made of high-alumina bricks.

[0040] The diversion runner 6 corresponds to the sealed connection ingot mold device, and the inner cavity of the sealing seat ring 21 and the ingot mold device are connected through an air duct. The ingot mold device includes an ingot mold body 12 and a sealing cover plate 10. The ingot mold body 12 and the sealing cover plate 10 are connected by a hook device 14. The sealing cover plate 10 is connected to a slag pot 16, and the slag pot 16 is filled with protective slag 17. The discharge port of the slag pot 16 is provided with a unloading switch 15. The inner side of the mold mouth of the ingot mold body is provided with an insulating plate 11, and the outside of the ingot mold body is connected to a mold ear 24.

[0041] The ingot mold device is placed on the bottom plate 13.

[0042] Example 2:

[0043] The structure of the vacuum pouring apparatus for multiple steel ingots in this embodiment is the same as that in Example 1, except that the inclined runner 7 consists of six sections, each connected by bolts and sealed with asbestos pads. Each section is 200 cm long. The diverter bricks 5 are made of high-alumina bricks, and the pouring bricks 9 are made of clay bricks. The pouring method in this embodiment is the same as that in Example 1.

[0044] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and basic spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for vacuum pouring multiple steel ingots, characterized in that: It includes a ladle, a sealing seat ring, a casting platform, a diverter, a diverter runner, and an ingot mold device. The ladle is sealed with the sealing seat ring, which is sealed on the casting platform. A drainage sand trough is provided inside the sealing seat ring, and a vacuum tube is provided on the side wall of the sealing seat ring. A diverter is provided on the casting platform below the ladle, and the diverter is opposite to the steel outlet of the ladle. Several diverter runners are connected to the diverter, and the diverter runners are sealed with the ingot mold device. The inner cavity of the sealing seat ring and the ingot mold device are connected through an air guide tube, and the ingot mold device is placed on the chassis.

2. The device for vacuum pouring multiple steel ingots according to claim 1, characterized in that: The drainage sand trough is connected to the slag receiving hydraulic cylinder outside the sealing seat ring.

3. The device for vacuum pouring multiple steel ingots according to claim 1, characterized in that: The ladle and the sealing seat ring are sealed with a sealing rubber gasket.

4. The device for vacuum pouring multiple steel ingots according to claim 1, characterized in that: The diverter is placed at the center of the sealing seat ring and connected with the casting platform by bolts. The inner lining of the diverter is diverter bricks.

5. The device for vacuum pouring multiple steel ingots according to claim 1, characterized in that: The diversion runner includes an inclined runner and a straight runner. The inner linings of the inclined runner and the straight runner are runner bricks. The runner bricks are connected to the diversion bricks in the diverter by a male-female joint.

6. The device for vacuum pouring multiple steel ingots according to claim 1, characterized in that: The ingot mold device includes an ingot mold body and a sealing cover plate. The ingot mold body and the sealing cover plate are connected by a hook device. The sealing cover plate is connected to a slag pot, which is filled with protective slag. A discharge switch is provided on the discharge port of the slag pot. An insulating plate is provided on the inner side of the mold opening of the ingot mold body, and the outside of the ingot mold body is connected to a mold ear.

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