A mold steel electroslag remelting furnace

Abstract

This utility model discloses an electroslag remelting furnace for mold steel, relating to the field of metallurgical technology. It includes a base, a coil, and a lifting mechanism. A multi-stage crystallizer is fixedly installed on the base. The multi-stage crystallizer consists of multiple individual crystallizers, each with its own cooling chamber. A mounting base is fixedly installed at the upper end of the multi-stage crystallizer, and a sealing mechanism is fixedly installed at the upper end of the mounting base. The beneficial effect lies in the fact that the weight of the electrodes is detected by a pressure sensor. Based on the change in electrode weight, the magnitude of the magnetic field generated by the coil is adjusted, thereby improving the flow of the molten pool within the multi-stage crystallizer, reducing segregation, and preventing excessive turbulence that could lead to slag entrapment. Furthermore, the independent crystallizers and individual cooling chambers allow for different melting processes of the electroslag in different areas, avoiding uneven cooling or temperature imbalance during the melting process and effectively improving the crystallization quality of the product.

Description

Technical Field

[0001] This utility model relates to the field of metallurgical technology, and in particular to an electroslag remelting furnace for mold steel. Background Technology

[0002] With the rapid development of my country's industry, the electroslag remelting furnace for mold steel is used in the processing of mold steel. The crystallizer is a continuous casting equipment that receives molten steel injected from the intermediate ladle and solidifies it into a solid billet shell according to the specified cross-sectional shape. It is the most critical component of the continuous casting machine, and its structure, material and performance parameters play a decisive role in the quality of the cast billet and the production capacity of the casting machine.

[0003] A search revealed that Chinese patent application CN219951168U discloses a crystallizer for an electroslag remelting furnace for mold steel. The crystallizer mainly uses an anti-adhesion inner pad design to allow the processed material to be discharged better from the outside of the crystallizer body, while also reducing the difficulty of cleaning the equipment later.

[0004] Compared with existing technologies in related fields, existing electroslag remelting furnaces for mold steel use a system that cools the entire product, making it impossible to precisely control the temperature during processing. This can easily lead to uneven crystallization of the product, and the single cooling method can cause component segregation, affecting the isotropic properties of the mold steel. Summary of the Invention

[0005] The purpose of this invention is to provide a mold steel electroslag remelting furnace to solve the above-mentioned problems.

[0006] This utility model achieves the above objectives through the following technical solutions: An electroslag remelting furnace for mold steel includes a base, coils, and a lifting mechanism. A multi-stage crystallizer is fixedly installed on the base. The multi-stage crystallizer consists of multiple individual crystallizers, each of which has its own cooling chamber. A mounting base is fixedly installed at the upper end of the multi-stage crystallizer, and a sealing mechanism is fixedly installed at the upper end of the mounting base. The sealing mechanism has a feeding pipe and a mounting hole. The coils are fixedly arranged on the outer surface of the multi-stage crystallizer, with the coils corresponding to the cooling chambers. The number of turns of the coils decreases sequentially from top to bottom. The lifting mechanism is located above the multi-stage crystallizer, and a material gripping mechanism is fixedly installed on the lifting mechanism. The material gripping mechanism holds an electrode, which is slidably connected to the sealing mechanism and inside the multi-stage crystallizer.

[0007] Furthermore, a pressure sensor is fixedly installed on the gripper part of the material handling mechanism, and the pressure sensor is connected to an electrode.

[0008] Furthermore, a mica sheet is fixedly mounted on the surface of the coil.

[0009] Furthermore, a temperature sensor and a flow rate sensor are fixedly installed inside the inlet end of the cooling chamber.

[0010] Furthermore, radiant heaters are fixedly arranged on the inner side of the mounting base.

[0011] Furthermore, heat pipes are fixedly installed on the upper end of the multi-stage crystallizer and on the mounting base. A heat exchange chamber is provided inside the mounting base, and an outlet pipe connecting the heat exchange chamber is provided on the side of the mounting base. The heat exchange chamber is connected to the multi-stage crystallizer through the heat pipes, and a honeycomb ceramic heat storage body is fixedly installed inside the heat exchange chamber.

[0012] Furthermore, a bracket is fixedly installed on the base. There are two brackets in total, located on both sides of the multi-stage crystallizer. A hydraulic telescopic mechanism is arranged on the bracket. A limit frame is fixedly installed on the telescopic end of the hydraulic telescopic mechanism. The limit frame is slidably connected to the multi-stage crystallizer.

[0013] The advantages compared to existing technologies are as follows: 1. The weight of the electrode is detected by the pressure sensor. The magnitude of the magnetic field generated by the coil is adjusted according to the change in the weight of the electrode. This can improve the flow of the molten pool in the multi-stage crystallizer, reduce segregation, and prevent excessive turbulence from causing slag entrapment. By using an independent crystallizer and equipped with a separate cooling chamber, different areas of electroslag can be smelted differently, avoiding uneven cooling or temperature imbalance during the smelting process, and effectively improving the crystallization quality of the product.

[0014] 2. Heat from the waste gas in the multi-stage crystallizer is introduced into the heat exchange chamber through heat pipes and stored in the honeycomb ceramic heat storage body, thereby keeping the mounting base warm and reducing heat waste. In conjunction with the radiation heater, the area around the electrode is preheated and supplemented with heat, effectively avoiding local low temperature from affecting the electroslag melting state, ensuring uniform temperature in the melting area, and improving the stability of the remelting process. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a first isometric structural schematic diagram of a mold steel electroslag remelting furnace according to the present invention; Figure 2 This utility model describes an electroslag remelting furnace for mold steel. Figure 1 Enlarged structural diagram at point A in the middle; Figure 3This utility model describes an electroslag remelting furnace for mold steel. Figure 1 Enlarged structural diagram at point B; Figure 4 This is a partial cross-sectional structural schematic diagram of the electroslag remelting furnace for mold steel described in this utility model; Figure 5 This utility model describes an electroslag remelting furnace for mold steel. Figure 4 Enlarged structural diagram at point C; Figure 6 This utility model describes an electroslag remelting furnace for mold steel. Figure 4 Enlarged structural diagram at point D; Figure 7 This utility model describes an electroslag remelting furnace for mold steel. Figure 4 Enlarged structural diagram at point E; Figure 8 This is a schematic diagram of the second isometric structure of the electroslag remelting furnace for mold steel described in this utility model.

[0017] The annotations in the attached figures are explained as follows: 1. Base; 2. Lifting mechanism; 3. Multi-stage crystallizer; 4. Mounting base; 5. Sealing mechanism; 6. Electrode; 7. Material gripping mechanism; 8. Cooling chamber; 9. Coil; 10. Mica sheet; 11. Radiant heater; 12. Heat exchange chamber; 13. Honeycomb ceramic heat storage body; 14. Heat conduction pipe; 15. Support; 16. Hydraulic telescopic mechanism; 17. Limiting frame; 18. Pressure sensor. Detailed Implementation

[0018] like Figures 1-8As shown, an electroslag remelting furnace for mold steel includes a base 1, coils 9, and a lifting mechanism 2. A multi-stage crystallizer 3 is fixedly installed on the base 1. The multi-stage crystallizer 3 consists of multiple individual crystallizers, each containing a cooling chamber 8. A mounting base 4 is fixedly installed on the upper end of the multi-stage crystallizer 3, and a sealing mechanism 5 is fixedly installed on the upper end of the mounting base 4. The sealing mechanism 5 has a feeding pipe and mounting holes. The coils 9 are fixedly arranged on the outer surface of the multi-stage crystallizer 3, corresponding to the cooling chambers 8. The number of turns of the coils 9 decreases sequentially from top to bottom. The lifting mechanism 2 is located above the multi-stage crystallizer 3. A multi-stage crystallizer 3 is fixedly mounted on the lifting mechanism 2. A material-grabbing mechanism 7 is installed, holding an electrode 6. The electrode 6 is slidably connected within the sealing mechanism 5 and the multi-stage crystallizer 3. The base 1, coil 9, lifting mechanism 2, material-grabbing mechanism 7, multi-stage crystallizer 3, sealing mechanism 5, and electrode 6 operate using existing technology. The feeding pipe on the sealing mechanism 5 is connected to an external material conveying device. Each cooling chamber 8 is individually connected to an external cooling medium conveying device. The multi-stage crystallizer 3 is fixedly installed on the base 1, which supports the multi-stage crystallizer 3. Through the design of the multi-stage crystallizer 3, in the event of damage, the damaged parts can be replaced or repaired individually according to the location of the damage, improving the convenience of maintenance. The lifting mechanism 2 moves the electrode 6 via the material grabbing mechanism 7, allowing the electrode 6 to enter the multi-stage crystallizer 3 through the mounting hole on the sealing mechanism 5. The sealing mechanism 5 then fixes the electrode 6. An external material conveying device adds material into the multi-stage crystallizer 3 through a feeding pipe. The multi-stage crystallizer 3 and the electrode 6 work together to melt the electroslag. Since the number of turns of the coil 9 decreases sequentially from top to bottom, the coils 9 at different positions are activated sequentially according to the melting requirements during the melting process, and the working efficiency of the coils 9 is controlled. In the initial stage of electrode 6 melting, the high-intensity alternating current of the upper coil 9 generates a strong stirring force, promoting the rapid formation of vortices in the slag pool and ensuring the flow of the electroslag. As the molten steel enters the middle of the multi-stage crystallizer 3, the eddy current generated by the low-intensity AC current in the middle coil 9 superimposes with the eddy current in the upper coil, increasing the velocity of the molten pool. During the solidification stage, the DC pulse in the lower coil 9 ensures crystallization while suppressing segregation, preventing dendrite breakage and improving the quality of crystallization. The cooling chamber 8 in the multi-stage crystallizer 3 forms three independent cooling zones: upper, middle, and lower. During the smelting process, different temperatures and speeds of cooling media are introduced into the cooling chamber 8 at different locations according to different smelting processes and progress, thereby performing different smelting processes on the electroslag in different areas, avoiding uneven cooling or temperature imbalance during the smelting process, and effectively improving the crystallization quality of the product.

[0019] like Figure 7As shown, a pressure sensor 18 is fixedly installed on the gripper part of the material gripping mechanism 7. The pressure sensor 18 is connected to the electrode 6. The gripper part of the material gripping mechanism 7 clamps and fixes the upper end of the electrode 6 through the pressure sensor 18. The electrode 6 applies a downward pressure force to the pressure sensor 18. The remaining weight of the electrode 6 after reaction is determined by the detection value of the pressure sensor 18, thereby determining the reaction speed of the electrode 6. Based on the reaction speed of the electrode 6, the working power of the coil 9 can be determined to ensure the processing efficiency of electroslag.

[0020] like Figure 5 As shown, a mica sheet 10 is fixedly installed on the surface of the coil 9. The mica sheet 10 operates using existing technology. By isolating and protecting the surface of the coil 9 with the mica sheet 10, the mutual influence between the coils 9 can be avoided, so that the coil 9 is in a stable working state, ensuring the melting requirements and processing quality, and reducing the damage of high temperature to the coil 9, thus ensuring the service life of the coil 9.

[0021] like Figure 5 As shown, a temperature sensor and a flow rate sensor are fixedly installed inside the inlet of the cooling chamber 8. The temperature sensor and the flow rate sensor operate using existing technology. The temperature sensor detects the temperature of the cooling medium in the cooling chamber 8, and the flow rate sensor detects the flow rate of the cooling medium in the cooling chamber 8. Based on the detection results of the temperature sensor and the flow rate sensor, the state of the medium in a certain cooling chamber 8 can be adjusted individually according to the melting requirements of different areas, so as to achieve precise cooling in different areas, meet the differentiated cooling requirements of different areas, avoid defects such as excessively high crystallizer temperature and slow crystallization of mold steel due to insufficient cooling, or excessively fast crystallization and internal cracks due to over-cooling, ensure uniform crystallization quality and performance of mold steel, and improve crystallization quality.

[0022] like Figure 6 As shown, a radiation heater 11 is fixedly arranged on the inner side of the mounting base 4. The radiation heater 11 operates using existing technology. Before the electroslag remelting is started, the upper end of the multi-stage crystallizer 3 is heated by the radiation heater 11. When the electrode 6 is installed into the multi-stage crystallizer 3, the electrode 6 is heated by the radiation heater 11 to increase the temperature of the electrode 6. This effectively avoids local temperature imbalance caused by the cold start of the electrode 6 and electroslag solidification caused by excessively low local temperature. It ensures the efficiency of electroslag arc initiation and melting, effectively maintains the temperature uniformity of the melting area, and enables better melting.

[0023] like Figure 2 , Figure 6As shown, a heat-conducting pipe 14 is fixedly installed on the upper end of the multi-stage crystallizer 3 and on the mounting base 4. A heat exchange chamber 12 is provided inside the mounting base 4, and an outlet pipe connecting the heat exchange chamber 12 is provided on the side of the mounting base 4. The heat exchange chamber 12 is connected to the multi-stage crystallizer 3 through the heat-conducting pipe 14. A honeycomb ceramic heat storage body 13 is fixedly installed inside the heat exchange chamber 12. The honeycomb ceramic heat storage body 13 operates using existing technology. The outlet pipe is connected to an external recovery device. During the electroslag remelting process, the waste gas generated by the multi-stage crystallizer 3 carries heat out. The waste gas carries the residual heat into the heat exchange chamber 12 through the heat-conducting pipe 14. The residual heat is absorbed and stored by the honeycomb ceramic heat storage body 13. The waste gas is discharged to the external recovery device for treatment through the outlet pipe to avoid polluting the on-site environment. The honeycomb ceramic heat storage body 13, after absorbing heat, protects the mounting base 4 and increases the temperature of the mounting base 4, so that the mounting base 4 can work with the radiation heater 11 to heat and keep the electrode 6 warm, making full use of the residual heat, improving the efficiency of heat utilization, and reducing resource waste.

[0024] like Figure 1 , Figure 4 , Figure 8 As shown, a bracket 15 is fixedly installed on the base 1. There are two brackets 15, which are located on both sides of the multi-stage crystallizer 3. A hydraulic telescopic mechanism 16 is arranged on the bracket 15. A limit frame 17 is fixedly installed on the telescopic end of the hydraulic telescopic mechanism 16. The limit frame 17 is slidably connected to the multi-stage crystallizer 3. The hydraulic telescopic mechanism 16 and the limit frame 17 operate using existing technology. During the remelting process, the hydraulic telescopic mechanism 16 drives the limit frame 17 to move, so that the limit frame 17 fits against the multi-stage crystallizer 3 and supports the multi-stage crystallizer 3. This effectively improves the stability of the multi-stage crystallizer 3 and avoids deviation due to external forces. It ensures that the multi-stage crystallizer 3 is always in the set position and avoids the electrode 6 from contacting the inner wall of the multi-stage crystallizer 3, short-circuiting, or deviating from the melting center due to the deviation of the multi-stage crystallizer 3 during the processing. This ensures the continuity and safety of the electroslag remelting process.

[0025] Working principle: such as Figure 1 , Figure 4 , Figure 8 As shown, after the multi-stage crystallizer 3 is fixedly installed on the base 1, the hydraulic telescopic mechanism 16 drives the limiting frame 17 to move, so that the limiting frame 17 fits against the multi-stage crystallizer 3 and supports the multi-stage crystallizer 3. like Figure 1 , Figure 2 , Figure 4 , Figures 6-8 As shown, the lifting mechanism 2 drives the electrode 6 to move through the material grabbing mechanism 7, so that the electrode 6 enters the multi-stage crystallizer 3 through the mounting hole on the sealing mechanism 5. The sealing mechanism 5 fixes the electrode 6. During the installation of the electrode 6, the radiation heater 11 heats the electrode 6 to increase the temperature of the electrode 6. like Figures 1-5 , Figure 7 , Figure 8 As shown, the external feeding device adds material into the multi-stage crystallizer 3 through the feeding pipe. The multi-stage crystallizer 3, electrode 6, and coil 9 work together to melt the electroslag. In the initial stage of electrode 6 melting, the high-intensity AC current of the upper coil 9 generates a strong stirring force, which promotes the rapid formation of eddies in the slag pool and ensures the fluidity of the electroslag. When the molten steel enters the middle of the multi-stage crystallizer 3, the eddies generated by the low-intensity AC current of the middle coil 9 superimpose with the upper eddies, increasing the melting pool speed. During the product solidification stage, the DC pulse of the lower coil 9 ensures crystallization while suppressing segregation, avoiding dendrite breakage, and improving the quality of crystallization. When the coil 9 is working, the mica sheet 10 isolates and protects the surface of the coil 9, which can avoid mutual interference between the coils. At the same time, during the melting process, the electrode 6 applies a downward pressure force to the pressure sensor 18. The remaining weight of the electrode 6 is determined by the detection value of the pressure sensor 18, thereby determining the reaction rate of the electrode 6. Based on the reaction rate of the electrode 6, the working power of the coil 9 is determined to ensure the processing efficiency of the electroslag. like Figure 5 As shown, during the melting process, the temperature of the cooling medium in the cooling chamber 8 is detected by a temperature sensor, and the flow rate of the cooling medium in the cooling chamber 8 is detected by a flow rate sensor. According to different melting processes and melting progress, cooling media with different temperatures and speeds are input into the cooling chamber 8 at different locations, so as to carry out different melting of electroslag in different areas, avoid uneven cooling or temperature imbalance during the melting process, and effectively improve the crystallization quality of the product. like Figure 2 , Figure 6 As shown, during the electroslag remelting process, the waste gas generated by the multi-stage crystallizer 3 carries heat out. The waste gas carries residual heat into the heat exchange chamber 12 through the heat pipe 14. The residual heat is absorbed and stored by the honeycomb ceramic heat storage body 13. The waste gas is discharged to the external recovery device for treatment through the exhaust pipe to avoid polluting the on-site environment. The honeycomb ceramic heat storage body 13 protects the mounting base 4 after absorbing heat and increases the temperature of the mounting base 4, so that the mounting base 4 can cooperate with the radiation heater 11 to heat and keep the electrode 6 warm.

[0026] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A die steel electroslag remelting furnace, characterized in that, The system includes a base (1), a coil (9), and a lifting mechanism (2). A multi-stage crystallizer (3) is fixedly installed on the base (1). The multi-stage crystallizer (3) is composed of multiple individual crystallizers. Each individual crystallizer in the multi-stage crystallizer (3) has a cooling chamber (8) set separately. A mounting base (4) is fixedly installed on the upper end of the multi-stage crystallizer (3). A sealing mechanism (5) is fixedly installed on the upper end of the mounting base (4). The sealing mechanism (5) is provided with a feeding pipe and a mounting hole. The coil (9) is fixedly arranged on the outer surface of the multi-stage crystallizer (3). The coil (9) corresponds to the cooling chamber (8). The number of turns of the coil (9) decreases from top to bottom. The lifting mechanism (2) is located above the multi-stage crystallizer (3). A material gripping mechanism (7) is fixedly installed on the lifting mechanism (2). An electrode (6) is held on the material gripping mechanism (7). The electrode (6) is slidably connected to the sealing mechanism (5) and the multi-stage crystallizer (3).

2. The electroslag remelting furnace for mold steel according to claim 1, characterized in that: A pressure sensor (18) is fixedly installed on the gripper part of the material gripping mechanism (7), and the pressure sensor (18) is connected to the electrode (6).

3. The electroslag remelting furnace for mold steel according to claim 1, characterized in that: A mica sheet (10) is fixedly mounted on the surface of the coil (9).

4. The electroslag remelting furnace for mold steel according to claim 1, characterized in that: A temperature sensor and a flow rate sensor are fixedly installed inside the inlet end of the cooling chamber (8).

5. The electroslag remelting furnace for mold steel according to claim 1, characterized in that: Radiation heaters (11) are fixedly arranged on the inner side of the mounting base (4).

6. The electroslag remelting furnace for mold steel according to claim 1, characterized in that: A heat-conducting pipe (14) is fixedly installed on the upper end of the multi-stage crystallizer (3) and on the mounting base (4). A heat exchange chamber (12) is provided inside the mounting base (4). An air outlet pipe communicating with the heat exchange chamber (12) is provided on the side of the mounting base (4). The heat exchange chamber (12) is connected to the multi-stage crystallizer (3) through the heat-conducting pipe (14). A honeycomb ceramic heat storage body (13) is fixedly installed inside the heat exchange chamber (12).

7. The electroslag remelting furnace for mold steel according to claim 1, characterized in that: A bracket (15) is fixedly installed on the base (1). There are two brackets (15), which are located on both sides of the multi-stage crystallizer (3). A hydraulic telescopic mechanism (16) is arranged on the bracket (15). A limit frame (17) is fixedly installed on the telescopic end of the hydraulic telescopic mechanism (16). The limit frame (17) is slidably connected to the multi-stage crystallizer (3).

Images