LF furnace rotating buggy ladle slag prevention structure and using method

Abstract

The invention discloses a slag prevention structure of an LF furnace rotating buggy ladle and a use method, relates to the technical field of LF furnace rotating buggy ladle structures, and aims to solve the problem of how to avoid the blockage and stagnation faults of the rotating buggy ladle caused by slag splashing of an LF furnace on the basis of not influencing the existing process. A groove is formed in the upper end of a buggy ladle body and used for containing an annular rotary frame, a rotary motor and a speed reducing mechanism are installed in the buggy ladle body, the rotary frame and the speed reducing mechanism are in gear transmission, tank seats are fixedly arranged on the two sides of the rotary frame, and a steel ladle is placed between the tank seats; the slag prevention structure comprises a slag prevention baffle, the two ends of the slag prevention baffle are fixedly connected with the tank bases on the two sides respectively, and the slag prevention baffle is located over the gear meshing position between the rotary frame and the speed reduction mechanism and used for preventing splashed steel slag from falling into the gear meshing position in the refining heating period. The steel slag protection device is simple in structure and convenient to use, the steel slag protection rate of a transmission meshing part can reach 100%, and the steel slag protection device rotates away during rotary hoisting and does not affect crane hoisting.

Description

Technical Field

[0001] The invention relates to the technical field of LF furnace rotary ladle car structures, and in particular to a slag prevention structure of a LF furnace rotary ladle car and a use method thereof. Background Art

[0002] LF furnace refining is one of the main methods of refining outside the furnace, and the key is to quickly make white slag. The purpose of LF slag making is to desulfurize, deoxidize, improve the alloy yield, remove inclusions, and make the molten steel achieve refining effects such as deoxidation, desulfurization, alloying, and heating in a short time. It ensures that the composition of the molten steel is accurate, the temperature is uniform, the inclusions are fully floated, and the purpose of purifying the molten steel is achieved. It coordinates the steelmaking and continuous casting processes very well, and the utilization rate is high.

[0003] The ladle car is a key equipment in this process. Due to the differences in the layout of the process production lines of enterprises, the connection between steelmaking and continuous casting in some enterprises is vertically distributed, and there is a situation of 90-degree rotation in the reception and transportation of the ladle. The national safety management department currently clearly requires that the metallurgical molten metal dispatching vehicle hoist must be hoisted with a fixed gantry hook. Therefore, in order to meet the dual requirements of safety and production, the enterprise designs a rotating ladle car to meet the conditions. In the actual use process, because the LF furnace has a high splashing rate, the slag splashes everywhere during the refining process, and the rotating rotation structure of the rotating ladle car cannot be completely closed. The slag splashes to the gear meshing point from time to time, and the rotation jams and stagnates during the rotation process. The processing time is long, causing the subsequent production line to stop production. There are safety risks in the processing process, which affects the smooth operation of the overall safety production; in addition, the ladle needs to be rotated into place after leaving the station, and the crane hoisting is realized in a limited space. If the structure is added, the ladle car needs to be redesigned, which may even affect the normal operation of the entire process. Therefore, there is an urgent need for a LF furnace rotary ladle car slag prevention structure and a use method to solve this problem. Summary of the invention

[0004] The object of the present invention is to provide a slag prevention structure and a use method of a LF furnace rotating ladle car, so as to solve the problem of how to avoid the LF furnace splashing slag causing the rotating ladle car to get stuck and stagnant without affecting the existing process.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a slag-proof structure for a rotating ladle car of an LF furnace, a groove is provided at the upper end of the ladle car body for placing a ring-shaped rotating frame, a rotating motor and a reduction mechanism are installed in the ladle car body, the rotating frame and the reduction mechanism are transmitted by gears, and tank seats are fixedly provided on both sides of the rotating frame, and the ladle is placed between the two; the slag-proof structure includes a slag-proof baffle, and its two ends are respectively fixedly connected to the tank seats on both sides, and the slag-proof baffle is located directly above the gear meshing position between the rotating frame and the reduction mechanism, and is used to prevent splashed slag from falling into the gear meshing position during the refining and heating period.

[0006] Preferably, a plurality of support rods are fixedly provided at the lower end of the slag prevention baffle, and the lower ends of the support rods are fixedly connected to the revolving frame.

[0007] Preferably, the slag-proof baffle is an arc-shaped plane structure, the central angles of the inner and outer arcs are both less than 180°, and the center of the circle coincides with the center line of the revolving frame.

[0008] Preferably, the slag prevention baffle is welded and fixed to the tank seat.

[0009] Preferably, its method of use includes the following specific contents: designing a slag baffle according to the position and size of the LF heating position, and cutting the slag baffle to a suitable shape and size and fixing it just above the gear meshing position in combination with the size of the ladle car body, the hoisting entry and exit space of the crane gantry hook, the rotation position change after leaving the station, and the angle change of the cable line, while ensuring that the crane gantry hook and the cable line are not blocked; when the LF furnace station is heated during the refining heating period, the slag baffle completely blocks the gear meshing position, and the splashed slag all splashes on the top and periphery of the slag prevention structure. After leaving the station, the rotating motor drives the rotating frame and the ladle thereon to rotate synchronously with the slag prevention baffle, turning away from the slag prevention position, and making room for the crane gantry hook to lift the ladle.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] The LF furnace rotating ladle car slag prevention structure and use method add a ladle car body tank seat slag prevention structure without changing the existing rotating structure. The slag prevention structure effectively shields the rotating parts during the heating period of the refining process, and can protect the gear meshing parts of the rotating structure from being affected by splashing slag. After the ladle car leaves the station, the slag prevention structure rotates synchronously with the tank seat, is stationary relative to the tank seat and moves relative to the rotating meshing part, forming slag prevention during the refining heating period, and is disengaged during rotating hoisting, without any interference with crane hoisting and production. The installation and use are simple and quick, and the slag protection rate of the transmission meshing parts can reach 100%, achieving zero damage of the rotating parts to the slag. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0013] Figure 2 This is a schematic diagram of the structure of the present invention from above, in which the slag-proof structure is partially seen through to show the structural relationship.

[0014] In the figure: 1. ladle; 2. tank base; 3. ladle car body; 4. gear meshing point; 5. slag baffle; 6. steel slag; 7. rotating frame. DETAILED DESCRIPTION

[0015] like Figure 1 and2 As shown, a slag-proof structure of a rotating ladle car of an LF furnace is provided, a groove is provided at the upper end of the ladle car body 3 for placing an annular rotating frame 7, a rotating motor and a reduction mechanism are installed in the ladle car body 3, the rotating frame 7 and the reduction mechanism are driven by gears, tank seats 2 are fixed on both sides of the rotating frame 7, and the ladle 1 is placed between the two; the slag-proof structure includes a slag-proof baffle 5, both ends of which are fixedly connected to the tank seats 2 on both sides, for example, by welding, etc., the slag-proof baffle 5 is located directly above the gear meshing part 4 between the rotating frame 7 and the reduction mechanism, and is used to prevent splashed slag from falling into the gear meshing part 4 during the refining and heating period.

[0016] In order to ensure a reliable structure, in a preferred embodiment, a plurality of support rods may be fixedly provided at the lower end of the slag prevention baffle 5. For details, please refer to Figure 1 The lower end of the support rod is fixedly connected to the rotating frame 7.

[0017] Example:

[0018] The LF furnace refining workshop of Ma Steel had three equipment failures and production shutdowns due to the problem of slag jamming in the rotating ladle car, and the process handling safety risk was relatively high. Since the rotation is generally blocked and cannot return to the lifting position, the only emergency treatment method for lifting is to use the wire rope hanging eye. However, the full tank has a large tonnage, and the temporary wire rope hoisting device is extremely difficult to set up, and the handling time is long, which has a great impact on production.

[0019] After repeated discussions and considerations, the workshop team members and R&D personnel determined the slag prevention structure in the above implementation mode: the slag prevention baffle is designed according to the position and size of the LF heating position, and the slag prevention baffle is cut to a suitable shape and size and fixed just above the gear meshing position, taking into account the size of the ladle car body, the hoisting in and out position space of the crane gantry hook, the rotation position change after leaving the station, and the angle change of the cable line. At the same time, it is ensured that the slag prevention baffle does not block the crane gantry hook and the cable line;

[0020] See also Figure 2 In this embodiment, the slag baffle is set to an arc-shaped plane structure. In order to leave enough operating space for the crane gantry hook, the central angles of the inner and outer arcs should be less than 180° to prevent the collision range from being too large during rotation, and the center of the circle should coincide with the center line of the rotating frame.

[0021] When the LF furnace is heated at the refining heating stage, the slag-proof baffle completely blocks the gear meshing area, and the splashed slag all splashes on the top and periphery of the slag-proof structure;

[0022] After leaving the station, the rotating motor drives the revolving frame and the ladle on it to rotate synchronously with the slag prevention baffle, turning away from the slag prevention position to make room for the ladle to be lifted by the crane gantry hook.

[0023] After the actual installation, we continued to track the on-site effects. After a long period of production observation, we found that the anti-slag structure was effective, simple and efficient to operate, the transmission parts below, especially the gear meshing parts, were clean and slag-free for a long time, the rotation was stable, and no debris entered the internal gears.

[0024] The above are only preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope defined by the claims.

[0025] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. A slag prevention structure for a rotating ladle car of an LF furnace, wherein a groove is provided at the upper end of a ladle car body (3) for placing an annular rotating frame (7), a rotating motor and a reduction mechanism are installed in the ladle car body (3), the rotating frame (7) and the reduction mechanism are driven by gears, and pot seats (2) are fixedly provided on both sides of the rotating frame (7), and a ladle (1) is placed between the two, characterized in that: The invention comprises a slag prevention baffle (5), both ends of which are fixedly connected to the tank seats (2) on both sides respectively. The slag prevention baffle (5) is located directly above the gear meshing part (4) between the rotary frame (7) and the speed reduction mechanism, and is used to prevent splashed steel slag from falling into the gear meshing part (4) during the refining heating period.

2. The LF furnace rotary ladle car slag prevention structure according to claim 1, characterized in that: A plurality of support rods are fixedly disposed at the lower end of the slag prevention baffle (5), and the lower ends of the support rods are fixedly connected to the revolving frame (7).

3. The LF furnace rotary ladle car slag prevention structure according to claim 1, characterized in that: The slag prevention baffle (5) is an arc-shaped plane structure, the center angles of the inner and outer arcs are both less than 180°, and the center of the circle coincides with the center line of the revolving frame (7).

4. The LF furnace rotary ladle car slag prevention structure according to claim 1, characterized in that: The slag prevention baffle (5) is fixed to the tank seat (2) by welding.

5. The LF furnace rotary ladle car slag prevention structure according to claim 1, characterized in that: The method of using the slag-proof baffle (5) comprises the following specific contents: designing a slag-proof baffle (5) according to the position and size of the LF heating position, and combining the size of the ladle car body (3), the hoisting in and out position space of the crane gantry hook, the rotation position change after leaving the station, and the angle change of the cable line, cutting the slag-proof baffle (5) to a suitable shape and size and fixing it just above the gear meshing position (4), while ensuring that the crane gantry hook and the cable line are not blocked; when the LF furnace station is heated during the refining heating period, the slag-proof baffle (5) completely blocks the gear meshing position (4), and the splashed slag all splashes on the top and periphery of the slag-proof structure; after leaving the station, the rotating motor drives the rotary frame (7) and the ladle (1) thereon to rotate synchronously with the slag-proof baffle (5), turning away from the slag-proof position, and making room for the crane gantry hook to lift the ladle (1).

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