Automatic covering agent adding device for LF (ladle furnace)

Abstract

The utility model relates to an automatic covering agent adding device for an LF (ladle furnace). The automatic covering agent adding device comprises a stock bin, a blanking flow pipe, a material distributing device, a weighing device and a quantitative feeding device, the top of the stock bin is of an open structure and is provided with a distributing net, and a bag breaking structure is arranged at the top of the distributing net. A discharging port in the bottom of the stock bin is connected with a material distributing device through a discharging flow pipe, a quantitative feeding device is arranged on the discharging flow pipe, and the material distributing device is composed of a plurality of layers of conical cylinders which are concentrically arranged. The stock bin is provided with a weighing device, and the weighing device and the quantitative feeding device are controlled in an interlocking mode through a control system. According to the device, the covering agent can be quantitatively added, feeding is simpler and more convenient, distribution of the covering agent on the liquid level of the steel ladle is more uniform, the contact area of the covering agent and molten steel is increased, the heat preservation effect is improved, and meanwhile the metallurgical performance of the covering agent can be fully exerted.

Description

Technical Field

[0001] The utility model relates to the technical field of LF furnace refining, in particular to an automatic covering agent adding device for an LF refining furnace. Background Art

[0002] With the development of the steel industry, the quality requirements for steel are increasing day by day, and the refining process outside the furnace, as an indispensable smelting link between the converter and continuous casting, has also received more and more attention. The LF ladle refining method uses argon stirring, graphite electrode submerged arc heating and slag refining under atmospheric pressure. After refining, the molten steel is usually transported to the continuous casting workshop for casting by a ladle car. If the transportation distance is long, the transported molten steel will be exposed to the air, which will lead to problems such as temperature reduction and secondary oxidation. Although measures such as covering the ladle can be adopted, it is time-consuming and labor-intensive, so the method of adding covering agents for insulation is often used. With the development of related technologies, the covering agent has gradually developed from the initial function of only heat preservation to the functions of preventing secondary oxidation, absorbing inclusions in steel, avoiding molten steel pollution, and preventing molten steel from resulfurizing.

[0003] The existing covering agent addition is usually done manually, which is inefficient, has a poor working environment and high labor intensity. Moreover, when manually adding materials, the covering agent can only be placed in a certain area of ​​the molten steel surface, and the distribution is extremely uneven, which neither plays the role of covering and heat preservation nor achieves the desired metallurgical effect. In addition, argon is blown from the bottom during the entire process of the ladle entering the station, and the center of the molten steel surface is turbulent more strongly, so the covering agent should be added to the surrounding areas of the molten steel surface as much as possible.

[0004] The Chinese utility model patent with the authorization announcement number CN 210730915 U discloses "an automatic covering agent adding device", including a hopper for filling the covering agent, a mechanical arm for cooperating with the hopper to grasp the hopper, and a driving device for cooperating with the mechanical arm to drive the mechanical arm to add the covering agent to the tundish. The above-mentioned automatic covering agent adding device can realize one-button automatic addition of covering agent to the tundish, the entire covering agent adding process can be fully automated, and the equipment can ensure the quality of molten steel; at the same time, the equipment can replace manual operation to avoid exposure to high temperature, dust pollution, and molten steel splashing hazards when operating. Although the device can automatically add covering agent, it uses a mechanical arm to simulate manual operation, and still cannot solve the problem of uneven distribution. Summary of the invention

[0005] The utility model provides an automatic covering agent adding device for an LF refining furnace, which can realize quantitative adding of covering agent, and the feeding is simpler and more convenient. The distribution of covering agent on the liquid surface of the ladle is more uniform, and the contact area between covering agent and molten steel is increased. The heat preservation effect is improved and the metallurgical properties of the covering agent itself can be fully exerted.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] An automatic covering agent adding device for an LF refining furnace comprises a silo, a lower material flow pipe, a material dividing device, a weighing device and a quantitative feeding device; the top of the silo is an open structure and is provided with a material dividing net, and a bag breaking structure is provided on the top of the material dividing net; the discharge port at the bottom of the silo is connected to the material dividing device through the lower material flow pipe, and a quantitative feeding device is set on the lower material flow pipe, and the material dividing device is composed of multiple layers of concentrically arranged cones; the silo is provided with a weighing device, and the weighing device and the quantitative feeding device are interlocked and controlled by a control system.

[0008] Furthermore, the silo consists of an upper silo body with uniform cross-section and a lower conical silo body; a material dividing net is provided on the top of the silo body with uniform cross-section; the silo body with uniform cross-section is a square silo body or a circular silo body, and the shape of the material dividing net matches the cross-sectional shape of the silo body with uniform cross-section.

[0009] Furthermore, the material dividing net is made of steel grating.

[0010] Furthermore, the bag breaking structure is a triangular pyramid structure composed of three steel plates, and the three steel plates are arranged along three ridges of the triangular pyramid.

[0011] Furthermore, the silo is arranged on a bracket or a platform; the weighing device is a weighing sensor, and the weighing sensor is arranged at a support of the silo.

[0012] Furthermore, a vibrating feeder is provided on the lower outer side of the silo.

[0013] Furthermore, the quantitative feeding device is a blade feeder.

[0014] Furthermore, a heat-insulating cover is arranged on the outer side of the material-distributing device, and the shape and size of the bottom of the heat-insulating cover match the shape and size of the top of the ladle.

[0015] Furthermore, a dust removal port is provided on the top of the heat preservation cover, and a dust removal device is connected through a dust removal pipeline of the heat preservation cover.

[0016] Furthermore, a silo dust removal cover is provided on the outer side of the top of the silo, and the silo dust removal cover is connected to the dust removal device through a silo dust removal pipeline.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] 1) A bag breaking structure is set on the top of the silo, which uses the gravity of the covering agent bag to automatically break the bag, saving labor;

[0019] 2) A material distribution net is installed on the top of the silo to ensure uniform distribution of the covering agent, and combined with a vibrating feeder, it can prevent the material flow pipe from being blocked;

[0020] 3) A weighing device and a quantitative feeding device are provided, and the weighing device and the quantitative feeding device are interlocked and controlled by a control system to realize automatic quantitative addition of covering agent into the ladle;

[0021] 4) The material distribution device adopts a multi-layer cone structure, which has a simple structure and good material distribution effect. It can disperse the covering agent into the molten steel. The covering agent is more evenly distributed along the molten steel liquid surface in the ladle, which increases the contact area between the covering agent and the molten steel. Not only does it improve the thermal insulation effect, but it can also give full play to the metallurgical properties of the covering agent itself.

[0022] 5) A heat preservation cover is provided on the outside of the material distribution device to keep the molten steel in the ladle warm when adding the covering agent;

[0023] 6) The silo and insulation cover are respectively equipped with dust removal devices to ensure that smoke and dust do not escape during the addition of the covering agent. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of an automatic covering agent adding device for a LF refining furnace described in the utility model.

[0025] Figure 2 It is a three-dimensional structural schematic diagram of the silo described in the utility model.

[0026] Figure 3 It is a structural schematic diagram of the material dividing device of the utility model.

[0027] In the figure: 1. Silo dust removal pipeline 2. Silo 3. Weighing device 4. Vibrating feeder 5. Quantitative feeding device 6. Insulation cover dust removal pipeline 7. Material distribution device 8. Insulation cover 9. Material distribution net 10. Bag breaking structure DETAILED DESCRIPTION

[0028] The specific implementation of the utility model is further described below in conjunction with the accompanying drawings:

[0029] like Figure 1 As shown, the LF refining furnace covering agent automatic adding device described in the utility model includes a silo 2, a material flow pipe, a material distribution device 7, a weighing device 3 and a quantitative feeding device 5; Figure 2 As shown, the top of the silo 2 is an open structure and is provided with a material distribution net 9, and a bag breaking structure 10 is provided on the top of the material distribution net 9; the discharge port at the bottom of the silo 2 is connected to the material distribution device 7 through a lower material flow pipe, and a quantity feeding device 5 is set on the lower material flow pipe, as shown in FIG. Figure 3 As shown, the material distribution device 7 is composed of multiple layers of concentrically arranged cones; the silo 2 is provided with a weighing device 3, and the weighing device 3 and the quantitative feeding device 5 are interlocked and controlled by a control system.

[0030] Furthermore, the silo 2 is composed of an upper silo body with uniform cross-section and a lower conical silo body; a material dividing net 9 is provided on the top of the silo body with uniform cross-section; the silo body with uniform cross-section is a square silo body or a circular silo body, and the shape of the material dividing net 9 matches the cross-sectional shape of the silo body with uniform cross-section.

[0031] Furthermore, the dividing net 9 is made of steel grating.

[0032] Furthermore, the bag breaking structure 10 is a triangular pyramid structure composed of three steel plates, and the three steel plates are arranged along three ridges of the triangular pyramid.

[0033] Furthermore, the silo 2 is arranged on a bracket or a platform; the weighing device 3 is a weighing sensor, and the weighing sensor is arranged at the support of the silo 2.

[0034] Furthermore, a vibrating feeder 4 is provided on the lower outer side of the silo 2 .

[0035] Furthermore, the quantitative feeding device 5 is a blade feeder.

[0036] Furthermore, a heat-insulating cover 8 is provided outside the material-distributing device 7, and the shape and size of the bottom of the heat-insulating cover 8 match the shape and size of the top of the ladle.

[0037] Furthermore, a dust removal port is provided on the top of the heat preservation cover 8, and a dust removal device is connected through the heat preservation cover dust removal pipeline 6.

[0038] Furthermore, a silo dust removal cover is provided on the outer side of the top of the silo 2, and the silo dust removal cover is connected to the dust removal device through the silo dust removal pipeline 1.

[0039] During conventional LF refining, covering agents are added by manual feeding, with workers standing on the working platform and manually adding covering agents through the platform feeding port. In this way, the amount of covering agent added is not accurately controlled, the steel liquid surface is unevenly covered, resulting in serious temperature loss of the molten steel, and the high temperature and dust environment poses a great threat to the health of workers.

[0040] The automatic covering agent adding device of the utility model can not only replace manual operation, but also, due to the addition of the material dividing device 7, the covering agent can be evenly dispersed on the surface of the molten steel, and the covering agent adding effect is better, so that the ladle can effectively reduce the temperature drop during the operation of the workshop, prevent the outside air from contacting the molten steel surface to cause secondary oxidation of the molten steel, thereby improving the metallurgical properties of the molten steel. The device adopts a fully sealed structure, and dust removal pipes are arranged on the upper part of the silo 2 and the insulation cover 8 to ensure that smoke and dust do not escape during the covering agent addition process, thereby improving the air environment in the workshop. The overall structure of the device is simple and easy to maintain.

[0041] The covering agent is unloaded with the aid of the vibrating feeder 4 and the quantitative feeding device 5. In this process, the weighing device 3 and the quantitative feeding device 5 are interlocked and controlled by the control system, and the amount of covering agent added is accurately controlled by the weight loss weighing method. Finally, the falling covering agent is broken up by the material distribution device 7, so that it is evenly covered on the molten steel surface of the ladle in a multi-layer ring shape.

[0042] The following examples are implemented based on the technical solution of the utility model, and provide detailed implementation methods and specific operation processes, but the protection scope of the utility model is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.

[0043] [Example]

[0044] like Figure 1-Figure 3 As shown, in this embodiment, the automatic adding device of the covering agent for the LF refining furnace includes a silo 2, a lower material flow pipe, a material dividing device 7, a weighing sensor, a vibrating feeder 4, a blade feeder and a dust removal device; a material dividing net 9 is provided on the top of the silo 2, and a bag breaking structure 10 is provided on the top of the material dividing net 9.

[0045] In this embodiment, the silo 2 is composed of an upper square-section silo body and a lower conical silo body; the material distribution net 9 is a square structure made of steel grating; and a vibrating feeder 4 is provided on the outer side of the conical silo body.

[0046] The bag breaking structure 10 is a triangular pyramid structure composed of three steel plates, and the three steel plates are arranged along three ridges of the triangular pyramid.

[0047] The silo 2 is arranged on the platform, and a weighing sensor is arranged at the connection between the silo 2 and the platform.

[0048] The discharge port at the bottom of the silo 2 is connected to the material distribution device 7 through a lower material flow pipe, and a blade feeder is arranged on the lower material flow pipe. The weighing sensor and the blade feeder are interlocked and controlled by a control system.

[0049] In this embodiment, the material distribution device 7 is composed of 5 layers of concentrically arranged circular cones; a heat preservation cover 8 is arranged on the outer side of the material distribution device 7, and the shape and size of the bottom of the heat preservation cover match the shape and size of the top of the ladle.

[0050] In this embodiment, a silo dust cover is provided on the outer side of the top of the silo 2, and the silo dust cover is connected to the dust removal device through the silo dust removal pipeline 1. A dust removal port is provided on the top of the heat preservation cover 8, and the dust removal device is connected through the heat preservation cover dust removal pipeline 6.

[0051] When the LF furnace refining is completed, the ladle car moves to the bottom of the LF refining furnace covering agent automatic adding device. When adding the covering agent, the bag breaking structure 10 on the top of the silo 2 automatically cuts the bag using the gravity of the covering agent bag. The amount of covering agent added is pre-set in the control system, and the remaining amount of material is automatically calculated by the weight loss weighing method based on the data of the weighing device, and the blade feeder is controlled to quantitatively discharge the material. When the covering agent falls to the distribution device 7, it is dispersed through 5 layers of cones and evenly spread on the surface of the molten steel in the ladle. The smoke generated during the covering agent addition process is collected through the silo dust removal pipeline 1 and the insulation cover dust removal pipeline 6 and sent to the dust removal device for purification.

[0052] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes according to the technical scheme and concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An automatic adding device for covering agent of LF refining furnace, characterized in that: It includes a silo, a lower material flow pipe, a material distribution device, a weighing device and a quantitative feeding device; the top of the silo is an open structure and is provided with a material distribution net, and a bag breaking structure is provided on the top of the material distribution net; the discharge port at the bottom of the silo is connected to the material distribution device through a lower material flow pipe, and a quantitative feeding device is set on the lower material flow pipe, and the material distribution device is composed of multiple layers of concentrically arranged cones; the silo is provided with a weighing device, and the weighing device and the quantitative feeding device are interlocked and controlled by a control system.

2. The automatic adding device for covering agent of LF refining furnace according to claim 1, characterized in that: The silo consists of an upper uniform-section silo body and a lower conical silo body; a material dividing net is arranged on the top of the uniform-section silo body; the uniform-section silo body is a square silo body or a circular silo body, and the shape of the material dividing net matches the cross-sectional shape of the uniform-section silo body.

3. The automatic adding device for adding covering agent to LF refining furnace according to claim 1 or 2, characterized in that: The material distribution net is made of steel grating.

4. The automatic adding device for covering agent of LF refining furnace according to claim 1, characterized in that: The bag breaking structure is a triangular pyramid structure composed of three steel plates, and the three steel plates are arranged along three ridges of the triangular pyramid.

5. The automatic adding device for covering agent of LF refining furnace according to claim 1, characterized in that: The silo is arranged on a bracket or a platform; the weighing device is a weighing sensor, and the weighing sensor is arranged at the support of the silo.

6. The automatic adding device for covering agent of LF refining furnace according to claim 1, characterized in that: A vibrating feeder is arranged on the outer side of the lower part of the silo.

7. The automatic adding device for covering agent of LF refining furnace according to claim 1, characterized in that: The quantitative feeding device is a blade feeder.

8. The automatic adding device for covering agent of LF refining furnace according to claim 1, characterized in that: A heat-insulating cover is arranged outside the material-distributing device, and the shape and size of the bottom of the heat-insulating cover match the shape and size of the top of the ladle.

9. The automatic adding device for covering agent of LF refining furnace according to claim 8, characterized in that: A dust removal port is arranged on the top of the heat preservation cover, and a dust removal device is connected through a dust removal pipeline of the heat preservation cover.

10. The automatic adding device for covering agent of LF refining furnace according to claim 1, characterized in that: A silo dust removal cover is arranged on the outer side of the top of the silo, and the silo dust removal cover is connected to the dust removal device through the silo dust removal pipeline.

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