Device for supplementing front large surface of converter by using pig iron slag

Abstract

The utility model discloses a device for supplementing a front large surface of a converter by using pig iron slag. The device comprises a frame, a pneumatic telescopic pull rod and a forklift, the frame is obliquely arranged at the bottom of the front large face of the converter, the high-position end is opposite to the front large face of the converter, the forklift is arranged at the low-position end, a supporting rod is transversely arranged in the middle of the frame, and a plurality of supporting sliding grooves are formed in the high-position end of the frame. A pneumatic telescopic pull rod is arranged in the frame from the low-position end to the high-position end, one end of an outer rod of the pneumatic telescopic pull rod is connected with the low-position end of the frame, the other end of the outer rod is connected with the supporting rod, and the free end of an inner rod of the pneumatic telescopic pull rod is slidably installed in the supporting sliding groove. According to the device, pig iron blocks can be uniformly paved in the front large-area impact area of the converter, so that the problems of molten steel composition fluctuation, pig iron block falling, repeated front-back furnace rocking and converter repairing time increase caused by accumulation and concentration of the pig iron blocks in a molten pool reaction area and the converter bottom after the pig iron blocks are added by using a crown block when the front large area is subjected to slag repairing are solved; the method has the advantages of being good in fettling effect, high in safety and short in fettling time.

Description

Technical Field

[0001] The utility model belongs to the technical field of converter steelmaking, and in particular relates to a device for filling the front large surface of a converter by using pig iron block slag. Background Art

[0002] There are two common ways to patch the converter: "slag patching" and "material patching". The material patching method requires sufficient sintering time and will increase the consumption of patching materials. Once the patching materials fall off, it is easy to increase the inclusions in the molten steel, making it difficult to slag, affecting the quality of the molten steel. The front large surface (charging side) of the converter has been subjected to mechanical impact from scrap steel and molten iron for a long time, and the erosion rate is relatively fast, requiring frequent maintenance. The pig iron block slag patching technology is to cool down the pig iron block through rapid heat exchange with high-temperature liquid slag. High-melting-point substances such as MgO, 2CaO·SiO2, and 3CaO·SiO2 in the slag are condensed and precipitated, the slag viscosity increases, and the slag and iron blocks are cooled and solidified and wrapped and adhered to the furnace lining, thereby achieving the purpose of rapid maintenance of the front large surface.

[0003] Pig iron block slag filling technology is a large-scale maintenance method for the front of the converter commonly used by most steel companies. Most of them currently prepare a proper amount of pig iron blocks in the scrap steel bucket, shake the converter to an angle of about 30-45° with the platform plane, use the overhead crane to lift the pig iron blocks in the scrap steel bucket. When they begin to slide, the furnace body is gradually tilted forward. At the same time, the main hook of the overhead crane gradually descends. When the iron blocks are quickly and evenly spread, the furnace mouth is shaken to a basically horizontal angle with the platform. After standing for 5-10 minutes, slag splashing is carried out to protect the furnace, and then the next furnace is smelted.

[0004] The converter uses pig iron block slag to patch the front large surface. Pig iron blocks are suitable for patching the front large surface impact area, but not suitable for patching the molten pool reaction area and the furnace bottom. However, in production practice, after pig iron blocks are added by the overhead crane, the pig iron blocks tend to gather in the molten pool reaction area and the furnace bottom, causing fluctuations in the composition of molten steel; when the final slag viscosity is high, the converter slag is thick and has poor fluidity, the pig iron block slag is not firmly bonded to the furnace lining, and the hanging slag is loose, which is very easy to cause falling off during the slag splashing to protect the furnace, affecting the pig iron block slag patching effect and safe production; in addition, when using the overhead crane to add pig iron block slag patching, the furnace needs to be shaken back and forth repeatedly, which increases the furnace patching time. Utility Model Content

[0005] The utility model aims to provide a device for filling the front large surface of a converter with pig iron block slag, so as to solve the problem that when the pig iron block slag is used to fill the front large surface of the converter, the pig iron blocks are easily gathered in the molten pool reaction zone and the furnace bottom, so that the pig iron block slag is not firmly bonded to the furnace lining, which is easy to fall off and increase the furnace filling time.

[0006] To achieve its purpose, the utility model adopts the following technical solutions:

[0007] A device for filling the front large surface of a converter with pig iron block slag, comprising a frame, a pneumatic telescopic pull rod and a forklift;

[0008] The frame is tilted at the bottom of the front large surface of the converter, the high end is opposite to the front large surface of the converter, and a forklift is provided at the low end. A support rod is horizontally provided in the middle of the frame, and a plurality of support slide grooves are provided at the high end of the frame; a pneumatic telescopic pull rod is provided inside the frame from the low end to the high end, one end of the outer rod of the pneumatic telescopic pull rod is connected to the low end of the frame, and the other end of the outer rod is connected to the support rod, and the free end of the inner rod of the pneumatic telescopic pull rod is slidably installed in the support slide groove.

[0009] As a further improvement of the technical solution of the utility model, the lower end of the frame is connected to the fork arm of the forklift through a forklift fork arm connector.

[0010] Furthermore, the gap between adjacent supporting grooves is 10 mm.

[0011] Furthermore, the length of the outer rod of the pneumatic telescopic pull rod is 2500-5000 mm.

[0012] Furthermore, the pneumatic telescopic pull rod is made of heat-resistant steel.

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

[0014] The utility model can evenly spread the pig iron blocks on the impact zone of the front large surface of the converter, avoid the pig iron blocks being added by the overhead crane when the front large surface is slag-filled, and the pig iron blocks being concentrated in the reaction zone of the molten pool and the bottom of the furnace, causing the fluctuation of the molten steel composition, the pig iron blocks falling off, and the furnace being repeatedly shaken back and forth, which increases the furnace filling time. The utility model has the advantages of good furnace filling effect, high safety and short furnace filling time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] In the figure: 1. frame; 2. pneumatic telescopic pull rod; 3. forklift; 21. fork arm connector; 22. support rod; 23. support slide. DETAILED DESCRIPTION

[0017] like Figure 1As shown, the utility model provides a device for mending the front large surface of a converter by using pig iron block slag, comprising a frame 1, a pneumatic telescopic pull rod 2 and a forklift 3; the frame 1 is tiltedly arranged at the bottom of the front large surface of the converter, the high end is opposite to the front large surface of the converter, the low end of the frame 1 is connected to the fork arm of the forklift 3 through a forklift fork arm connector 21, a support rod 22 is horizontally arranged in the middle part of the frame 1, and a plurality of support slide grooves 23 are arranged at the high end of the frame 1, and the gap between adjacent support slide grooves 23 is 10mm; a pneumatic telescopic pull rod 2 is arranged inside the frame 1 from the low end to the high end, one end of the outer rod of the pneumatic telescopic pull rod 2 is connected to the low end of the frame 1, and the other end of the outer rod is connected to the support rod 22, and the free end of the inner rod of the pneumatic telescopic pull rod 2 is slidably installed in the support slide groove 23.

[0018] A 50-ton converter in a certain factory has a furnace bottom height of 5700mm and a molten pool depth of 1000mm. The gap between the support chutes 23 used is 10mm; the length of the pneumatic telescopic tie rod 2 is 2500mm. When slag is used to fill the large surface in front of the converter, prepare 1t of pig iron blocks with a specification of 460mm×120mm in advance and use an electromagnetic crane to evenly spread the pig iron blocks on the inner rod part of the pneumatic telescopic tie rod 2 inside the frame 1; insert the fork arm of the forklift 3 into the fork arm connector 21, shake the converter to an angle of about 80° with the converter operating platform, start the forklift 3 to send the frame 1 into the converter, start the control switch of the pneumatic telescopic tie rod 2, and the inner rod of the pneumatic telescopic tie rod 2 retracts from the support chute 23 to the outer rod, and the pig iron blocks are evenly spread on the large impact area in front of the converter. Since the gap between the supporting slide grooves 23 is 10mm, the pig iron blocks can be placed stably. The length of the pneumatic telescopic pull rod 2 is 2500mm, which ensures that the pig iron blocks are evenly spread on the large impact area in front of the converter, avoiding the pig iron blocks being concentrated in the molten pool reaction area and the bottom of the furnace after the pig iron blocks are added by the overhead crane in the front large surface of the slag filling, causing fluctuations in the composition of the molten steel. At the same time, there is no need to shake the furnace repeatedly, which shortens the filling time, ensures the safety of slag filling of pig iron blocks, and improves the operation rate of the converter.

[0019] The pneumatic telescopic rod 2 is made of heat-resistant steel, which prevents the pneumatic telescopic rod 2 from being deformed under high temperature when inserted into the converter in a short time.

Claims

1. A device for filling the front surface of a converter with pig iron slag, characterized in that: It comprises a frame (1), a pneumatic telescopic pull rod (2) and a forklift (3); The frame (1) is tiltedly arranged at the bottom of the front large surface of the converter, the high end is opposite to the front large surface of the converter, and the low end is provided with a forklift (3). A support rod (22) is horizontally arranged in the middle of the frame (1), and a plurality of support slide grooves (23) are arranged at the high end of the frame (1); a pneumatic telescopic pull rod (2) is arranged inside the frame (1) from the low end to the high end, one end of the outer rod of the pneumatic telescopic pull rod (2) is connected to the low end of the frame (1), and the other end of the outer rod is connected to the support rod (22), and the free end of the inner rod of the pneumatic telescopic pull rod (2) is slidably installed in the support slide groove (23).

2. The device for filling the front surface of a converter with pig iron slag according to claim 1 is characterized in that: The lower end of the frame (1) is connected to the fork arm of a forklift (3) via a forklift fork arm connector (21).

3. The device for filling the front surface of a converter with pig iron slag according to claim 1 is characterized in that: The gap between adjacent supporting slide grooves (23) is 10 mm.

4. The device for filling the front surface of a converter with pig iron slag according to claim 1 is characterized in that: The length of the outer rod of the pneumatic telescopic pull rod (2) is 2500-5000 mm.

5. A device for filling the front surface of a converter with pig iron slag according to any one of claims 1 to 4, characterized in that: The pneumatic telescopic pull rod (2) is made of heat-resistant steel.

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