Induction furnace and single-snorkel refining furnace combined molten steel vacuum treatment device

Abstract

The utility model relates to the technical field of metallurgical devices, and discloses a molten steel vacuum treatment device combining an induction furnace and a single-snorkel refining furnace. Comprising an induction furnace, a hydraulic jacking device arranged below the induction furnace, a single-nozzle refining furnace movably arranged above the induction furnace and a vacuum pipeline capable of being automatically connected with the single-nozzle refining furnace in a sealed mode. The hydraulic jacking device can drive the induction furnace to do lifting motion in the vertical direction, and during smelting, the immersion depth of an immersion pipe of the single-snorkel refining furnace in molten steel in the induction furnace is kept to be 400-500 mm all the time. According to the utility model, the induction furnace is combined with the single-snorkel refining furnace, so that the energy consumption can be reduced in the smelting stage of steel, the vacuum treatment flow of molten steel is simplified, the temperature drop loss of the molten steel can be reduced, and the treatment time can be saved.

Description

Technical Field

[0001] The utility model relates to the technical field of metallurgical devices, in particular to a molten steel vacuum treatment device which combines an induction furnace with a single-mouth refining furnace. Background Art

[0002] As we all know, smelting high-quality steel is inseparable from vacuum treatment, and steelmaking requires energy conservation and consumption reduction to further improve the market competitiveness of products. For this reason, we have proposed a metallurgical equipment that combines a "single-mouth refining furnace" vacuum device with a low-energy induction furnace. The combination of these two devices can not only reduce energy consumption during the smelting stage of steel, but also simplify the vacuum treatment process of molten steel, which can reduce the temperature drop loss of molten steel and save processing time. Under the combined influence of the above key factors, we can improve the cleanliness of molten steel in a short time while reducing production costs when smelting clean high-quality steel. Utility Model Content

[0003] In order to solve the problems existing in the prior art, the utility model provides a molten steel vacuum treatment device which combines an induction furnace with a single-mouth refining furnace and has a reasonable structural design and can reduce production costs and improve product quality.

[0004] The technical solution of the utility model is as follows:

[0005] A molten steel vacuum treatment device combining an induction furnace and a single-mouth refining furnace comprises an induction furnace, a hydraulic jacking device arranged below the induction furnace, a movably arranged single-mouth refining furnace above the induction furnace, and a vacuum pipeline that can be automatically sealed and connected to the single-mouth refining furnace by controlling an expansion joint; the hydraulic jacking device can make the induction furnace move up and down in the vertical direction, and during smelting, the immersion pipe of the single-mouth refining furnace is always kept immersed in the molten steel in the induction furnace at a depth of 400-500mm.

[0006] Furthermore, a bottom-blowing air-permeable brick is provided at an eccentric position at the bottom of the induction furnace, and argon (nitrogen) is blown into the molten steel in the induction furnace through the bottom-blowing air-permeable brick installed at the bottom of the induction furnace.

[0007] Furthermore, the single-mouth refining furnace and the vacuum pipeline are automatically sealed and connected by controlling the vacuum connection device.

[0008] Furthermore, the single-mouth refining furnace is equipped with a single-mouth refining furnace crane, through which the single-mouth refining furnace can be horizontally moved to above the induction furnace and accurately positioned.

[0009] Furthermore, the hydraulic jacking device includes a hydraulic jacking cylinder and a hydraulic jacking tray. The hydraulic jacking cylinder is arranged at a central position directly below the hydraulic jacking tray, and the induction furnace is arranged on the hydraulic jacking tray.

[0010] Furthermore, the temperature measuring sampling gun on one side of the vacuum chamber of the single-mouth refining furnace is used to measure the temperature and take samples of the molten steel in the induction furnace.

[0011] Furthermore, the vacuum connection device is an expansion joint, and the expansion joint at the interface of the vacuum pipe of the single-mouth refining furnace and the interface of the vacuum pipeline are at the same center line position.

[0012] Furthermore, the hydraulic lifting tray is surrounded by masonry for positioning and supporting the hydraulic lifting tray.

[0013] The beneficial effects of the utility model are as follows:

[0014] 1) The utility model combines the induction furnace with the single-mouth refining furnace, which can not only reduce energy consumption in the steel smelting stage, but also simplify the steel liquid vacuum treatment process, that is, it can reduce the temperature drop loss of the steel liquid and save the treatment time.

[0015] 2) When smelting clean high-quality steel, the utility model can improve the cleanliness of molten steel in a short time and reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the induction furnace structure of the utility model;

[0018] Figure 3 This is a schematic diagram of the structure of a single-mouth refining furnace of the utility model;

[0019] Figure 4 This is a schematic diagram of the vacuum pipeline structure of the utility model;

[0020] Figure 5 This is a schematic diagram of the structure of the hydraulic jacking device of the utility model;

[0021] In the figure: 1. induction furnace; 2. single-mouth refining furnace; 201. immersion tube; 202. temperature measuring sampling gun; 203. vacuum chamber; 3. vacuum pipeline; 4. hydraulic lifting device; 401. hydraulic lifting cylinder; 402. hydraulic lifting tray; 5. vacuum connection device; 6. single-mouth refining furnace crane; 7. bottom blowing air bricks; 8. masonry. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the accompanying drawings of the specification.

[0023] like Figure 1 As shown, a molten steel vacuum treatment device combining an induction furnace and a single-mouth refining furnace comprises an induction furnace 1, a single-mouth refining furnace 2, a vacuum pipeline 3, and a hydraulic jacking device 4;

[0024] A hydraulic jacking device 4 is arranged below the induction furnace 1. Under the action of the hydraulic jacking device 4, the induction furnace 1 can perform a linear lifting motion along the Z-axis direction;

[0025] A single-mouth refining furnace 2 is movably arranged above the induction furnace 1 via a single-mouth refining furnace crane 6, and the single-mouth refining furnace crane 6 can drive the single-mouth refining furnace 2 to move linearly in a horizontal direction to just above the induction furnace 1;

[0026] The position of the vacuum pipe 3 is fixed, and after the single-mouth refining furnace 2 moves to the right position, the vacuum pipe 3 and the single-mouth refining furnace 2 can be sealedly connected through the pipe connecting device.

[0027] like Figure 2 As shown, a bottom-blowing air-permeable brick 7 is provided at an eccentric position at the bottom of the induction furnace 1, and argon (or nitrogen) is blown into the molten steel in the induction furnace 1 through a pipeline from the bottom-blowing air-permeable brick 7 installed at the bottom of the induction furnace 1.

[0028] like Figure 3 As shown, the temperature measuring sampling gun 202 on one side of the vacuum chamber of the single-mouth refining furnace 2 is used to measure the temperature and take samples of the molten steel in the induction furnace 1.

[0029] like Figure 4 As shown, the pipeline connection device adopts an expansion joint, and the expansion joint at the interface of the vacuum pipe of the single-mouth refining furnace 2 and the interface of the vacuum pipeline should be at the same center line position, so as to achieve automatic sealing connection.

[0030] like Figure 5 As shown, the hydraulic lifting device 4 includes a hydraulic lifting cylinder 401 and a hydraulic lifting tray 402. The hydraulic lifting cylinder 401 is arranged at the center position directly below the hydraulic lifting tray 402. The induction furnace 1 is arranged on the hydraulic lifting tray 402. The hydraulic lifting tray 402 is surrounded by masonry 8 for its positioning support.

[0031] The following is a detailed description of the workflow of the utility model:

[0032] 1) Induction furnace melts scrap steel;

[0033] 2) After several times of adding scrap steel and smelting process, the molten steel in the induction furnace reaches a certain liquid level and the molten steel temperature reaches the specified value, and the induction furnace stops smelting; the dust removal hood of the induction furnace is removed to make room for the single-mouth refining furnace.

[0034] 3) The single-mouth refining furnace is driven by the single-mouth refining furnace crane, and the single-mouth refining furnace is moved to the top of the induction furnace through the track for precise positioning; at this time, the vacuum pipe interface of the single-mouth refining furnace and the vacuum pipe expansion joint are at the same center line position; start the expansion joint oil (gas) cylinder to seal the vacuum pipe and the vacuum pipe of the single-mouth refining furnace.

[0035] 4) Start the temperature measuring sampling gun installed on one side of the vacuum chamber to measure the temperature of the molten steel in the induction furnace and take samples; the temperature of the molten steel is automatically uploaded to the control system; the sample is pneumatically transported to the testing room, and after the testing room tests the steel sample, the test results are uploaded to the control system.

[0036] 5) After the corresponding parameters of the molten steel meet the requirements before vacuum treatment, unlock the locking device of the induction furnace; start the hydraulic lifting device to lift the induction furnace to the position where the immersion pipe of the single-mouth refining furnace is immersed in the molten steel 400-500mm, and then start the vacuum pump step by step to perform vacuum extraction. As the vacuum extraction proceeds, the molten steel is continuously sucked into the vacuum chamber and rises, and the molten steel level in the induction furnace begins to drop. During the vacuum extraction process, the hydraulic lifting device continuously lifts upward, always keeping the lower end of the immersion pipe 400-500mm below the molten steel, until the vacuum degree in the vacuum chamber reaches 76Pa and stops lifting.

[0037] 6) When the immersion tube enters the molten steel, the blowing device is turned on to blow argon (or nitrogen) of a certain pressure into the molten steel through the eccentric air brick installed at the bottom of the induction furnace, so that the molten steel flows in the induction furnace and the immersion tube to form a stable flow field, which plays a role in stirring and mixing. The specific argon blowing system depends on the smelting process of different steel grades.

[0038] 7) When the vacuum degree in the vacuum chamber reaches 76Pa, the vacuum degree is maintained; in a high vacuum environment, due to the stirring and mixing of argon gas, harmful elements such as hydrogen, oxygen, and nitrogen in the molten steel are continuously precipitated until it meets the requirements of smelting steel grades; the specific vacuum maintenance time is determined by the process of smelting steel grades.

[0039] 8) After the vacuum treatment is completed, nitrogen is slowly blown into the vacuum chamber to break the vacuum; as the vacuum degree continues to decrease, the molten steel sucked into the vacuum chamber slowly drops, and as the molten steel level drops, the induction furnace lifted by the hydraulic jacking device must also drop accordingly to keep the immersion tube always immersed in the molten steel at a depth of 400-500mm; when it is determined that the pressure in the vacuum chamber is the same as the atmospheric pressure, the hydraulic jacking device can continue to drop until the induction furnace returns to its original position and is locked by the induction furnace locking device.

[0040] 9) The expansion joint is opened, the vacuum interface of the single-mouth refining furnace is separated from the vacuum tube expansion joint, and the single-mouth refining furnace is driven by the crane to move away from the induction furnace; after the molten steel in the induction furnace is subjected to refining treatments such as soft blowing and wire feeding, the induction furnace is tilted to discharge steel.

[0041] 10) After the smelting is completed, the next batch of steel is smelted.

[0042] The above embodiments are only preferred embodiments of the present utility model and are not limitations on the technical solutions of the present utility model. Any technical solution that can be implemented on the basis of the above embodiments without creative work should be deemed to fall within the scope of protection of the patent of the present utility model.

Claims

1. A molten steel vacuum treatment device combining an induction furnace and a single-mouth refining furnace, characterized in that: The invention comprises an induction furnace (1), a hydraulic jacking device (4) arranged below the induction furnace (1), a single-mouth refining furnace (2) movably arranged above the induction furnace (1), and a vacuum pipe (3) which can be automatically sealed and connected to the single-mouth refining furnace (2) by controlling an expansion joint; the hydraulic jacking device (4) can make the induction furnace (1) move up and down in a vertical direction, and during vacuum smelting, the immersion pipe of the single-mouth refining furnace (2) is always kept immersed in the molten steel in the induction furnace (1) at a depth of 400-500 mm.

2. The steel liquid vacuum treatment device combining an induction furnace and a single-mouth refining furnace according to claim 1 is characterized in that: A bottom-blowing air-permeable brick (7) is provided at an eccentric position at the bottom of the induction furnace (1), and gas is blown into the molten steel in the induction furnace (1) through the bottom-blowing air-permeable brick (7) installed at the bottom of the induction furnace (1).

3. The steel liquid vacuum treatment device combining an induction furnace and a single-mouth refining furnace according to claim 1 is characterized in that: The single-mouth refining furnace (2) and the vacuum pipeline (3) are automatically sealed and connected by controlling the vacuum connection device (5).

4. The molten steel vacuum treatment device combining an induction furnace and a single-mouth refining furnace according to claim 1 is characterized in that: The single-mouth refining furnace (2) is equipped with a single-mouth refining furnace crane (6), and the single-mouth refining furnace crane (6) can be used to horizontally move the single-mouth refining furnace (2) to the top of the induction furnace (1) and accurately position it.

5. The molten steel vacuum treatment device combining an induction furnace and a single-mouth refining furnace according to claim 1 is characterized in that: The hydraulic lifting device (4) comprises a hydraulic lifting cylinder (401) and a hydraulic lifting tray (402); the hydraulic lifting cylinder (401) is arranged at a central position directly below the hydraulic lifting tray (402); and the induction furnace (1) is arranged on the hydraulic lifting tray (402).

6. The steel liquid vacuum treatment device combining an induction furnace and a single-mouth refining furnace according to claim 1 is characterized in that: The temperature measuring sampling gun (202) on one side of the vacuum chamber of the single-mouth refining furnace (2) is used to measure the temperature and take samples of the molten steel in the induction furnace (1).

7. The molten steel vacuum treatment device combining an induction furnace and a single-mouth refining furnace according to claim 3 is characterized in that: The vacuum connection device (5) is an expansion joint, and the expansion joint at the vacuum pipe interface of the single-mouth refining furnace (2) and the interface of the vacuum pipeline are located at the same center line position.

8. The steel liquid vacuum treatment device combining an induction furnace and a single-mouth refining furnace according to claim 5 is characterized in that: The hydraulic lifting tray (402) is surrounded by masonry (8) for positioning and supporting it.

Images