Steel ladle feeding device and operation method thereof

Abstract

A steel ladle feeding device belongs to the technical field of steel smelting and comprises a base body, the top end of the base body is connected with a mechanical arm mechanism, the bottom end of the base body is provided with a footing unit, and the mechanical arm mechanism is connected with a high-temperature stock bin and used for moving the high-temperature stock bin. The high-temperature stock bin is of a grab bucket structure and comprises a grab bucket frame, a grab bucket driving unit and two symmetrically-arranged semi-conical bucket bodies. The semi-conical hopper body is provided with an interlayer cavity, an air inlet communicated with the interlayer cavity is formed in the top of the outer side face of the semi-conical hopper body, an exhaust hole communicated with the interlayer cavity is formed in the top of the inner side face of the semi-conical hopper body, and the air inlet is connected with an argon inflation mechanism. The steel ladle feeding device is reasonable in design and simple in structure, circulating argon is adopted in the high-temperature stock bin to protect materials, the remote control function is achieved, the purity of molten steel can be effectively guaranteed, potential safety hazards can be reduced, and the steel ladle feeding device is easy to popularize.

Description

Technical Field

[0001] The present invention relates to the technical field of steel smelting, and in particular to a ladle feeding device and an operating method thereof. Background Art

[0002] Iron and steel smelting is a general term for the metallurgical process of steel and iron. Industrially produced iron is divided into pig iron (carbon content above 2%) and steel (carbon content below 2%) according to the carbon content. Most modern ironmaking uses blast furnace ironmaking, and some uses direct reduction ironmaking and electric furnace ironmaking. Steelmaking mainly uses pig iron made in blast furnaces, sponge iron made by direct reduction ironmaking, and scrap steel as raw materials, and uses different methods to make steel. Its basic production process is to smelt iron ore into pig iron in an ironmaking furnace, and then use pig iron as raw material to make steel by different methods, and then cast it into steel ingots or continuous casting billets.

[0003] The main steelmaking methods at present are: converter steelmaking, open-hearth steelmaking, and electric arc furnace steelmaking. These three steelmaking processes can meet the requirements of general users for steel quality. In order to meet the requirements of higher quality and more varieties of high-grade steel, a variety of methods of molten steel out-of-furnace treatment (also known as out-of-furnace refining) have emerged. For example, argon blowing treatment, vacuum degassing, out-of-furnace desulfurization, etc., after additional treatment of molten steel produced by converters, open-hearth furnaces, and electric arc furnaces, high-grade steel grades can be produced. For some special purposes and steels requiring extremely high quality, if out-of-furnace treatment still cannot meet the requirements, special steelmaking methods must be used. For example, electroslag remelting is a refining process in which steel smelted in converters, open-hearth furnaces, electric arc furnaces, etc. is cast or forged into electrodes and remelted twice through slag resistance heat; vacuum metallurgy is a metallurgical process carried out under conditions below one atmosphere to ultra-high vacuum, including the smelting, purification, refining, forming and processing of metals and alloys.

[0004] At present, due to the different types of steel, the materials added at different smelting periods are also different. Some alloys are added all at once during the refining process, some alloys are added in batches, and some alloys need to be added during the vacuum degassing stage. Among them, most of the alloys added during vacuum degassing still rely on workers to use shovels or throw them directly by hand. This operation may cause the alloy to be added to the slag layer instead of directly entering the molten steel. Materials with low melting points may be directly oxidized, and the slag on the molten steel may also be brought into the molten steel. These will affect the purity of the molten steel and thus affect the product quality. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art that manual operation is prone to inclusion of slag, contamination of materials, and influence on the purity of molten steel, and to provide a ladle feeding device with reasonable design and simple structure. The high-temperature silo adopts circulating argon gas to protect materials and has a remote control function, which can not only effectively ensure the purity of molten steel, but also reduce safety hazards, and is suitable for promotion.

[0006] The present invention is realized through the following technical scheme: a ladle feeding device, including a base body, the top end of the base body is connected to a mechanical arm mechanism, the bottom end of the base body is provided with a foot unit, the mechanical arm mechanism is connected to a high-temperature silo, and the mechanical arm mechanism is used to move the high-temperature silo. The high-temperature silo adopts a grab structure, and the high-temperature silo includes a grab frame, a grab drive unit and two symmetrically arranged semi-conical bucket bodies. The wide ends of the two semi-conical bucket bodies are hinged through the grab frame to form a conical grab that can be opened and closed. The grab drive unit is arranged on the grab frame, and the grab drive unit is used to drive the opening and closing of the conical grab, that is, the opening and closing of the high-temperature silo. The high-temperature silo is connected to the mechanical arm mechanism through the grab frame, and the conical end of the high-temperature silo, that is, the conical end of the conical grab, faces the steel liquid surface. The semi-conical bucket body is provided with an interlayer chamber, an air inlet hole communicating with the interlayer chamber is provided at the top of the outer side of the semi-conical bucket body, and an exhaust hole communicating with the interlayer chamber is provided at the top of the inner side of the semi-conical bucket body. The air inlet hole is connected to an argon gas charging mechanism, which is used to charge argon gas into the interlayer chamber. When the interlayer chamber is filled with argon gas, the argon gas can be transported to the cavity of the high-temperature silo through the exhaust hole.

[0007] A further improvement of the present invention is that a main controller is provided on the base body, and a mechanical arm control system, a silo control system and an argon control system are installed on the main controller. The mechanical arm control system is used to control the operation of the mechanical arm mechanism, the silo control system is used to control the opening and closing of the high-temperature silo, and the argon control system is used to control the switching of the argon filling mechanism and adjust the argon flow rate.

[0008] A further improvement of the present invention is that both the outer side surface and the inner side surface of the semi-conical bucket body are provided with an oxidation coating layer.

[0009] The operation method of the ladle feeding device comprises the following steps: S1. In the first 5 minutes after VD breaks through the air, the high-temperature silo is first moved to a suitable feeding position by the robotic arm mechanism, and then the high-temperature silo is tilted by the robotic arm mechanism.

[0010] S2. After the high-temperature silo is adjusted, open the high-temperature silo, that is, open the two semi-conical buckets; after the high-temperature silo is opened, add the material, that is, add the material into the semi-conical bucket located below; after the material is added, close the high-temperature silo, that is, close the two semi-conical buckets.

[0011] S3. After the high-temperature silo is closed, the argon filling mechanism starts to fill argon until the high-temperature silo is full.

[0012] S4. After the argon gas is filled, the high-temperature silo is made vertically above the molten steel surface and 200mm away from the ladle riser through the robotic arm mechanism; then the high-temperature silo is lowered through the robotic arm mechanism until the high-temperature silo is 300mm deep into the molten steel surface; finally, the high-temperature silo is opened, and after 10s, the high-temperature silo is slowly raised through the robotic arm mechanism.

[0013] S5. After the high-temperature silo leaves the molten steel surface, carbonized rice husks are quickly added to the broken part of the molten steel surface to prevent the molten steel from oxidizing.

[0014] S6. After the carbonized rice husk is added, the high-temperature silo is moved to an open space through a robotic arm mechanism and the residual molten steel is cleaned.

[0015] A further improvement of the present invention is that in step S1, the inclination angle of the high temperature silo is 45°-60°.

[0016] A further improvement of the present invention is that in step S2, the amount of material added is ≤20kg.

[0017] A further improvement of the present invention is that in step S3, the filling flow rate of argon is 12NL / min, the filling pressure of argon is 0.21MPa, and after 3 minutes, the high-temperature silo can be fully filled with argon.

[0018] A further improvement of the present invention is that in step S4, the descending speed of the high-temperature silo is less than 30 mm / s, and the ascending speed of the high-temperature silo is less than 50 mm / s.

[0019] The beneficial effects of the present invention are as follows: the high-temperature silo of the device adopts a conical design, and its taper can be used to break the slag layer on the surface of the molten steel, avoiding the problem of slag inclusion. The high-temperature silo also adopts a design that matches the interlayer chamber with the argon gas charging mechanism. The argon gas charging mechanism is connected to the interlayer chamber, which can provide argon protection for the high-temperature silo, that is, the high-temperature silo adopts circulating argon gas to protect the material, which can prevent air or other gases from polluting the material and entering the molten steel, thereby avoiding pollution and ensuring the purity of the molten steel. At the same time, the device adopts remote control technology, and the remote control of the mechanical arm mechanism, the high-temperature silo and the argon gas charging mechanism can be achieved through the main controller, which is convenient, fast and safe. Moreover, by using the above-mentioned operating method, argon protection is always maintained in the high-temperature silo during the entire feeding process, avoiding oxidation of the material and the molten steel surface, greatly improving the purity of the molten steel, and thus ensuring product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the top structure of a specific embodiment of the present invention.

[0022] Figure 2 It is a cross-sectional view of a high-temperature silo according to a specific embodiment of the present invention.

[0023] 1. Base body; 2. Robotic arm mechanism; 3. Foot unit; 4. High-temperature silo; 401. Semi-conical bucket body; 402. Interlayer chamber; 5. Argon gas charging mechanism; 6. Main controller. DETAILED DESCRIPTION

[0024] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in this specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent.

[0025] Now refer to Figure 1 and 2 , combined with a specific embodiment, the following is described: A ladle loading device according to the present invention includes a base body 1, a mechanical arm mechanism 2 is connected to the top of the base body 1, a foot unit 3 is provided at the bottom of the base body 1, and the mechanical arm mechanism 2 is connected to a high-temperature bin 4, and the mechanical arm mechanism 2 is used to move the high-temperature bin 4. Specifically, the mechanical arm mechanism 2 includes a vertical arm, a horizontal large arm, a horizontal small arm, an upper bevel gear and other components, and its detailed structure can refer to the existing industrial mechanical arm, and will not be described in detail in this specification.

[0026] Combined with the existing grab bucket technology, the high temperature silo 4 adopts a grab bucket structure, and the high temperature silo 4 includes a grab bucket frame, a grab bucket drive unit and two symmetrically arranged semi-conical bucket bodies 401. The wide ends of the two semi-conical bucket bodies 401 are hinged through the grab bucket frame to form a conical grab bucket that can be opened and closed, and the outer side surface and the inner side surface of the semi-conical bucket body 401 are both provided with an oxidation coating layer. The grab bucket drive unit is arranged on the grab bucket frame, and the grab bucket drive unit is used to drive the opening and closing of the conical grab bucket, that is, the opening and closing of the high temperature silo 4. Specifically, the detailed connection structure between the above-mentioned grab bucket frame, the grab bucket drive unit and the semi-conical bucket body 401 can refer to the existing grab bucket, and will not be described in detail in this specification.

[0027] The high temperature silo 4 is connected to the mechanical arm mechanism 2 through a grab frame, and the conical end of the high temperature silo 4, that is, the conical end of the conical grab, faces the steel liquid surface. The semi-conical bucket body 401 is provided with an interlayer chamber 402, and the top of the outer side of the semi-conical bucket body 401 is provided with an air inlet communicating with the interlayer chamber 402, and the top of the inner side of the semi-conical bucket body 401 is provided with an exhaust hole communicating with the interlayer chamber 402.

[0028] The air inlet is connected to an argon gas charging mechanism 5, which is used to charge the interlayer chamber 402 with argon. When the interlayer chamber 402 is filled with argon, the argon can be transported to the cavity of the high-temperature silo 4 through the exhaust hole. Specifically, the argon gas charging mechanism 5 includes components such as an argon gas pipeline and a control valve. The detailed structure thereof can refer to the existing industrial gas charging pipeline, and will not be described in detail in this specification.

[0029] Specifically, in combination with the existing control technology, a main controller 6 is provided on the base body 1, and a mechanical arm control system, a silo control system and an argon control system are installed on the main controller 6. The mechanical arm control system is used to control the operation of the mechanical arm mechanism 2, the silo control system is used to control the opening and closing of the high-temperature silo 4, and the argon control system is used to control the switching of the argon gas filling mechanism 5 and adjust the argon gas flow rate. The staff can realize remote control of the mechanical arm mechanism 2, the high-temperature silo 4 and the argon gas filling mechanism 5 through the main controller 6, which is convenient, fast and safe.

[0030] The use principle of this device: The high-temperature silo 4 of this device adopts a conical design, and its taper can be used to break the slag layer on the surface of the molten steel, avoiding the problem of slag inclusion. The high-temperature silo 4 also adopts a design that matches the interlayer chamber 402 and the argon gas charging mechanism 5. The argon gas charging mechanism 5 is connected to the interlayer chamber 402, which can provide argon protection for the high-temperature silo 4. That is, the high-temperature silo 4 adopts circulating argon gas to protect the material, which can prevent air or other gases from polluting the material and entering the molten steel, thereby avoiding pollution and ensuring the purity of the molten steel. At the same time, this device adopts remote control technology, and the main controller 6 can realize remote control of the robotic arm mechanism 2, the high-temperature silo 4 and the argon gas charging mechanism 5, which is convenient, fast and safe.

[0031] The operating method of a ladle loading device according to the present invention comprises the following steps: S1. In the first 5 minutes after VD breaks through the air, the high-temperature silo 4 is first moved to a suitable feeding position by the robotic arm mechanism 2, and then the high-temperature silo 4 is tilted by the robotic arm mechanism 2; specifically, the tilt angle of the high-temperature silo 4 is 45°-60°.

[0032] S2. After the high-temperature silo 4 is adjusted, open the high-temperature silo 4, that is, open the two semi-conical buckets 401; after the high-temperature silo is opened, add the material, that is, add the material to the semi-conical bucket 401 located below; after the material is added, close the high-temperature silo 4, that is, close the two semi-conical buckets 401; specifically, the amount of material added is ≤20kg.

[0033] S3. After the high-temperature silo 4 is closed, the argon filling mechanism 5 starts to fill the high-temperature silo 4 with argon; specifically, the filling flow rate of argon is 12NL / min, the filling pressure of argon is 0.21MPa, and after 3 minutes, the high-temperature silo 4 can be filled with argon.

[0034] S4. After the argon gas is filled, the high-temperature silo 4 is made vertically above the molten steel surface and 200mm away from the ladle riser through the robotic arm mechanism 2; then the high-temperature silo 4 is lowered through the robotic arm mechanism 2 until the high-temperature silo 4 penetrates 300mm into the molten steel surface; finally, the high-temperature silo 4 is opened, and after 10s, the high-temperature silo 4 is slowly raised through the robotic arm mechanism 2; specifically, the descending speed of the high-temperature silo 4 is less than 30mm / s, and the rising speed of the high-temperature silo 4 is less than 50mm / s.

[0035] S5. After the high-temperature silo 4 leaves the molten steel surface, carbonized rice husks are quickly added to the broken part of the molten steel surface to prevent the molten steel from oxidizing.

[0036] S6. After the carbonized rice husk is added, the high-temperature silo 4 is moved to an open space through the robotic arm mechanism 2 and the residual molten steel is cleaned.

[0037] By using the above-mentioned operation method, during the entire feeding process, argon protection is always maintained in the high-temperature silo 4, thereby avoiding oxidation of the material and the molten steel surface, greatly improving the purity of the molten steel, and thus ensuring product quality.

[0038] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other.

[0039] The terms "upper", "lower", "outer side", "inner side", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish the relative relationship in position if they exist, and do not need to be qualitative. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0040] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A ladle loading device, comprising a base body (1), characterized in that: The top end of the base body (1) is connected to a mechanical arm mechanism (2), the bottom end of the base body (1) is provided with a foot unit (3), the mechanical arm mechanism (2) is connected to a high-temperature silo (4), and the mechanical arm mechanism (2) is used to move the high-temperature silo (4); the high-temperature silo (4) adopts a grab structure, and the high-temperature silo (4) comprises a grab frame, a grab drive unit, and two symmetrically arranged semi-conical bucket bodies (401); the wide ends of the two semi-conical bucket bodies (401) are hingedly connected through the grab frame, thereby forming a conical grab that can be opened and closed; the grab drive unit is arranged on the grab frame, and the grab drive unit is used to drive the opening and closing of the conical grab, that is, the opening and closing of the high-temperature silo (4); the high-temperature silo (4) is connected to the mechanical arm mechanism (2) through a grab frame, and the conical end of the high-temperature silo (4), that is, the conical end of the conical grab, faces the steel liquid surface; the semi-conical bucket body (401) is provided with an interlayer chamber (402), the top of the outer side surface of the semi-conical bucket body (401) is provided with an air inlet hole communicating with the interlayer chamber (402), and the top of the inner side surface of the semi-conical bucket body (401) is provided with an exhaust hole communicating with the interlayer chamber (402); the air inlet hole is connected to an argon gas charging mechanism (5), and the argon gas charging mechanism (5) is used to charge argon gas into the interlayer chamber (402). When the interlayer chamber (402) is filled with argon gas, the argon gas can be transported to the cavity of the high-temperature silo (4) through the exhaust hole.

2. A ladle feeding device according to claim 1, characterized in that: A main controller (6) is provided on the base body (1), and a mechanical arm control system, a silo control system and an argon control system are installed on the main controller (6); the mechanical arm control system is used to control the operation of the mechanical arm mechanism (2), the silo control system is used to control the opening and closing of the high-temperature silo (4), and the argon control system is used to control the switching of the argon gas of the argon gas charging mechanism (5) and to adjust the argon gas flow rate.

3. A ladle feeding device according to claim 2, characterized in that: The outer side surface and the inner side surface of the semi-conical bucket body (401) are both provided with an oxidation coating layer.

4. The operating method of a ladle loading device according to claim 3, characterized in that: The steps include: S1. In the first 5 minutes after the VD breaks through the air, the high-temperature silo (4) is first moved to a suitable feeding position by the robotic arm mechanism (2), and then the high-temperature silo (4) is tilted by the robotic arm mechanism (2); S2. After the high-temperature silo (4) is adjusted, the high-temperature silo (4) is opened, that is, the two semi-conical buckets (401) are opened; after the high-temperature silo (4) is opened, the material is added, that is, the material is added to the semi-conical bucket (401) located below; after the material is added, the high-temperature silo (4) is closed, that is, the two semi-conical buckets (401) are closed; S3. After the high-temperature silo (4) is closed, the argon filling mechanism (5) starts to fill the argon until the high-temperature silo (4) is filled; S4. After the argon gas is filled, the high-temperature silo (4) is vertically positioned above the molten steel surface and 200 mm away from the ladle riser through the robotic arm mechanism (2); then the high-temperature silo (4) is lowered through the robotic arm mechanism (2) until the high-temperature silo (4) is 300 mm below the molten steel surface; finally, the high-temperature silo (4) is opened, and after 10 seconds, the high-temperature silo (4) is slowly raised through the robotic arm mechanism (2); S5. After the high-temperature silo (4) leaves the molten steel surface, carbonized rice husks are quickly added to the breach of the molten steel surface to prevent oxidation of the molten steel; S6. After the carbonized rice husk is added, the high-temperature silo (4) is moved to an open space through the robotic arm mechanism (2) and the residual molten steel is cleaned.

5. The operating method of the ladle loading device according to claim 4, characterized in that: In step S1, the inclination angle of the high temperature silo (4) is 45°-60°.

6. The operating method of the ladle loading device according to claim 5, characterized in that: In step S2, the amount of material added is ≤20kg.

7. The operating method of the ladle loading device according to claim 6, characterized in that: In step S3, the filling flow rate of argon is 12NL / min, and the filling pressure of argon is 0.21MPa. After 3 minutes, the argon can fill the high-temperature silo (4).

8. The operating method of the ladle loading device according to claim 7, characterized in that: In step S4, the descending speed of the high-temperature material bin (4) is less than 30 mm / s, and the ascending speed of the high-temperature material bin (4) is less than 50 mm / s.

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