Charging system for adding waste steel into electric furnace

Abstract

The charging system comprises a chain plate machine, the chain plate machine is used for transporting waste steel blocks to a charging section of the electric furnace, the two sides of the chain plate machine are each provided with a transporting unit, and the two transporting units are both used for transporting the waste steel blocks to the chain plate machine; wherein one transportation unit comprises an electromagnetic chuck crane or a steel grabbing machine, the electromagnetic chuck crane or the steel grabbing machine is used for transporting waste steel blocks in a waste steel pool to a chain plate machine, and the electromagnetic chuck crane or the steel grabbing machine is further used for transporting the waste steel blocks to the waste steel pool for temporary storage; the other conveying unit comprises a vibrating feeder, a discharging port of the vibrating feeder is located above the chain plate machine, and the vibrating feeder is used for enabling the scrap steel blocks on the vibrating feeder to fall onto the chain plate machine through vibration. According to the feeding system for adding the waste steel into the electric furnace, the two conveying units share one chain plate machine to convey the waste steel, so that the feeding efficiency of the waste steel blocks is remarkably improved, and capital construction and equipment investment is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of electric furnace steelmaking, and in particular relates to a feeding system for adding scrap steel to an electric furnace. Background Art

[0002] The steel industry has high energy consumption and severe pollution. To achieve clean production, that is, to produce qualified, low-cost high-quality products with the lowest resource consumption, the highest production efficiency, the most optimized quality control and the smallest environmental load close to "zero emissions", it is necessary to strengthen process technology optimization, the most important of which is to optimize the steel production process as a whole.

[0003] Compared with blast furnace converter steelmaking, electric furnace steelmaking using scrap steel as raw material has the advantages of less infrastructure investment, high production efficiency, low energy consumption, and less emissions. Therefore, the proportion of electric furnace steelmaking using scrap steel as raw material in steelmaking has increased year by year in recent years. Secondly, the development of my country's power resources and the adjustment of the steel product structure have also gradually expanded electric furnace steelmaking that directly uses scrap steel for steelmaking. Both of the above points will lead to an increase in the demand for scrap steel resources.

[0004] The horizontal continuous charging electric arc furnace uses the flue gas generated during the smelting process as a heat source to preheat the scrap steel on the charging section, that is, the horizontal continuous charging electric arc furnace uses the heat generated by the combustion of carbon monoxide gas in the flue gas generated during the smelting process in the preheating section to preheat the scrap steel; at the same time, during the preheating of the scrap steel in the preheating section, the heat released by the combustion of the combustibles it carries can also contribute to the preheating of the scrap steel. Using the preheated scrap steel for flat molten pool smelting has less impact on the power grid and is more energy-efficient, which is more superior to traditional electric furnaces.

[0005] At present, the main way to add scrap steel is to transport the scrap steel to the scrap steel pool by car, use an electromagnetic suction cup crane to lift the scrap steel in the car into the scrap steel pool, and use the electromagnetic suction cup crane to gradually lift the scrap steel in the scrap steel pool to the electric furnace charging section and transport it to the electric furnace through the preheating zone. In this charging method, the amount of scrap steel sucked by the electromagnetic suction cup crane each time is limited, so this charging method has the disadvantage of low operating efficiency, and the successive lifting by the electromagnetic suction cup crane will correspondingly extend the smelting cycle. Summary of the invention

[0006] In order to solve all or part of the above problems, the purpose of the present invention is to provide a feeding system for adding scrap steel to an electric furnace, wherein the scrap steel blocks are transported to the feeding section of the electric furnace by a chain conveyor, and the scrap steel blocks are transported to the chain conveyor by two transport units, thereby reducing infrastructure and equipment investment, improving the efficiency of adding scrap steel blocks to the electric furnace, shortening the feeding time, and thereby shortening the smelting cycle using scrap steel blocks.

[0007] According to one aspect of the present invention, there is provided a feeding system for adding scrap steel to an electric furnace, comprising a chain conveyor, wherein the chain conveyor is used to transport scrap steel blocks to the feeding section of the electric furnace, and transport units are arranged on both sides of the chain conveyor, and both of the transport units are used to transport scrap steel blocks to the chain conveyor.

[0008] Furthermore, one of the transport units includes an electromagnetic chuck crane or a steel grabber, which is used to transport the scrap steel blocks in the scrap steel pool to the chain conveyor, and the electromagnetic chuck crane or the steel grabber is also used to transport the scrap steel blocks to the scrap steel pool for temporary storage.

[0009] Furthermore, another of the transport units includes a vibrating feeder, the discharge port of the vibrating feeder is located above the chain conveyor, and the vibrating feeder is used to vibrate the scrap steel blocks on the vibrating feeder to drop onto the chain conveyor.

[0010] Furthermore, a chute is connected to the discharge port of the vibrating feeder, the chute is inclined, and the lower end of the chute is located above the chain conveyor. The vibrating feeder is used to vibrate so that the scrap steel blocks on it fall onto the chain conveyor through the chute.

[0011] Furthermore, a wear-resistant lining is provided in the slide pipe, and the wear-resistant lining is detachably connected to the slide pipe.

[0012] Furthermore, a gate valve is provided at the discharge port of the vibrating feeder, and the gate valve is used to control the flow rate of the scrap steel blocks flowing out of the discharge port.

[0013] Furthermore, the portion of the gate valve in contact with the scrap steel block is provided with a wear-resistant lining, and the wear-resistant lining is replaceable.

[0014] Furthermore, another of the transport units also includes a crane, which is used to lift the basket containing the scrap steel blocks to the receiving bin of the vibrating feeder, so that the scrap steel blocks in the basket can fall into the receiving bin after the basket is opened.

[0015] Furthermore, another of the transport units also includes a span transport vehicle, which is used to transport the basket containing the scrap steel blocks to the side of the crane.

[0016] Furthermore, the parts of the vibrating feeder in contact with the scrap steel blocks are provided with wear-resistant linings, and the wear-resistant linings are replaceable.

[0017] It can be seen from the above technical solution that the feeding system for adding scrap steel to an electric furnace provided by the present invention has the following beneficial effects:

[0018] The feeding system for adding scrap steel to an electric furnace of the present invention adopts two transport units to share a chain conveyor to transport the scrap steel, thereby significantly improving the feeding efficiency of the scrap steel blocks, and can reduce the feeding time for the entire scrap steel smelting to about 20 minutes, so that the electric furnace smelting cycle is controlled within 36 minutes; and the two transport units share the same chain conveyor, thereby reducing infrastructure and equipment investment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a flow chart of a feeding system for adding scrap steel to an electric furnace according to an embodiment of the present invention;

[0020] Figure 2 is a schematic diagram of a transport unit according to an embodiment of the present invention;

[0021] The reference numerals in the figure are: material basket 1, receiving bin 2, gate valve 3, vibrating feeder 4, chute 5, chain conveyor 6, dust removal hood 7, and feeding section 8 of the electric furnace. DETAILED DESCRIPTION

[0022] In order to better understand the purpose, structure and function of the present invention, a feeding system for adding scrap steel to an electric furnace of the present invention is further described in detail below in conjunction with the accompanying drawings.

[0023] like Figure 1 As shown, it shows a feeding system for adding scrap steel to an electric furnace according to an embodiment of the present invention, including a chain conveyor 6, which is used to transport the scrap steel blocks to the feeding section 8 of the electric furnace, and transport units are arranged on both sides of the chain conveyor 6, and the two transport units are used to transport the scrap steel blocks to the chain conveyor 6.

[0024] In this embodiment, the scrap steel blocks are transported to the charging section 8 of the electric furnace by the chain conveyor 6 and then put into the furnace for smelting. Compared with the prior art of using an electromagnetic suction cup crane for transportation, the transportation by the chain conveyor 6 improves the efficiency of scrap steel entering the furnace, shortens the charging time, and thus shortens the smelting cycle. In specific implementation, for example, the electric furnace is a horizontal continuous charging electric furnace.

[0025] Among them, transport units are arranged on both sides of the chain conveyor 6, and the transport units on both sides of the chain conveyor 6 are used to transport the scrap steel blocks to the chain conveyor 6. The arrangement of the transport units on both sides of the chain conveyor 6 in this embodiment realizes dual-channel transportation of scrap steel blocks, thereby significantly improving the feeding efficiency of the scrap steel blocks; and the two transport units share the same chain conveyor 6, thereby reducing infrastructure and equipment investment.

[0026] In one embodiment, one of the transport units includes an electromagnetic suction cup crane or a steel grabber, which is used to transport the scrap steel blocks in the scrap steel pool to the chain conveyor 6. The electromagnetic suction cup crane or the steel grabber is also used to transport the scrap steel blocks to the scrap steel pool for temporary storage.

[0027] In this embodiment, one of the transport units includes an electromagnetic suction cup crane or a steel grabber. When loading is required, relatively large scrap steel blocks are directly grabbed by the electromagnetic suction cup crane or the steel grabber and placed on the chain conveyor 6. The chain conveyor 6 then transports the scrap steel blocks to the charging section 8 of the electric furnace as mentioned above. In this embodiment, the electromagnetic suction cup crane or the steel grabber only needs to transport the scrap steel blocks from the scrap steel pool to the chain conveyor 6, and its transportation distance is shorter than the transportation distance of the prior art that directly transports the scrap steel blocks from the scrap steel pool to the charging section 8 of the electric furnace.

[0028] Secondly, relatively large scrap steel blocks are transported to the scrap steel pool by car, and the electromagnetic suction cup crane or steel grabber is also used to suck the scrap steel blocks in the car into the scrap steel pool.

[0029] In one embodiment, another transport unit includes a vibrating feeder 4, the discharge port of the vibrating feeder 4 is located above the chain conveyor 6, and the vibrating feeder 4 is used to vibrate the scrap steel blocks on the vibrating feeder 4 to drop onto the chain conveyor 6.

[0030] In this embodiment, another transport unit includes a vibrating feeder 4, and the discharge port of the vibrating feeder 4 is located above the chain plate conveyor 6, so that the material in the vibrating feeder 4 can fall onto the chain plate conveyor 6 after passing through its discharge port, and the chain plate conveyor 6 transports the scrap steel blocks to the feeding section 8 of the electric furnace as described above. The vibrating feeder 4 of this embodiment can be used to transport small pieces of scrap steel processed by the scrap steel processing center. The vibrating feeder 4 of this embodiment can efficiently and continuously supply scrap steel to the electric furnace.

[0031] Among them, Figure 2 As shown, a chute 5 is connected to the discharge port of the vibrating feeder 4. The chute 5 is inclined, and the lower end of the chute 5 is located above the chain conveyor 6. The vibrating feeder 4 is used to vibrate so that the scrap steel blocks on it fall onto the chain conveyor 6 through the chute 5.

[0032] Specifically, the scrap steel blocks falling from the discharge port of the vibrating feeder 4 will fall into the chute 5. Since the chute 5 is inclined and the upper end of the chute 5 is located at the discharge port of the vibrating feeder 4, and the lower end of the chute 5 is located above the chain conveyor 6, the scrap steel blocks falling into the chute 5 will roll downward under the action of gravity and fall on the chain conveyor 6.

[0033] The slide pipe 5 is provided with a wear-resistant lining, which is detachably connected to the slide pipe 5. The wear-resistant lining in the slide pipe 5 is used to adapt to the impact and wear of the scrap steel block, and the wear-resistant lining can be removed and replaced with a new one after being damaged. In specific implementation, the slide pipe 5 can be fixed by a bracket, and the slide pipe 5 can also be replaced.

[0034] Among them, a gate valve 3 is provided at the discharge port of the vibrating feeder 4, and the gate valve 3 is used to control the flow rate of the scrap steel blocks flowing out of the discharge port. The part of the gate valve 3 in contact with the scrap steel blocks is provided with a wear-resistant lining, and the wear-resistant lining is replaceable. The wear-resistant lining of the gate valve 3 of this embodiment is provided to adapt to the impact and wear of the scrap steel blocks, and the wear-resistant lining can be removed and replaced with a new wear-resistant lining after being damaged.

[0035] Among them, another transport unit also includes a crane, which is used to lift the basket 1 containing the scrap steel blocks to the receiving bin 2 of the vibrating feeder 4, so that the scrap steel blocks in the basket 1 can fall into the receiving bin 2 after the basket 1 is opened.

[0036] In this embodiment, a crane is arranged upstream of the vibrating feeder 4, and the crane is used to lift the basket 1 containing scrap steel blocks next to the chain conveyor 6 to the receiving bin 2 of the vibrating feeder 4, so that the scrap steel blocks in the basket 1 can fall into the receiving bin 2 of the vibrating feeder 4.

[0037] In a specific implementation, for example, the material basket 1 includes a cylinder and a lower bottom plate, and the lower bottom plate can be opened downward. After the lower bottom plate is opened downward, the scrap steel blocks in the material basket 1 fall into the receiving bin 2 of the vibrating feeder 4. After the lower bottom plate is connected to the cylinder, it can be used to load the scrap steel blocks, thereby facilitating a crane to lift the material basket 1 that has been filled with scrap steel blocks to the receiving bin 2 of the vibrating feeder 4.

[0038] Among them, another transport unit also includes a cross-transport vehicle, which is used to transport the basket 1 containing the scrap steel blocks to the crane.

[0039] Another transport unit of the embodiment of the present invention is specifically described as follows: it can be used to transport small pieces of scrap steel that have been crushed by the scrap steel processing plant to the chain plate conveyor 6. Specifically, the basket 1 loaded with scrap steel blocks is transported to the chain plate conveyor 6 by a cross-transport vehicle, and the basket 1 is lifted by a crane to the top of the receiving bin 2 of the vibrating feeder 4, and the basket 1 is opened to allow the scrap steel to fall into the receiving bin 2. The scrap steel is vibrated by the vibrating feeder 4 so that it falls onto the chain plate conveyor 6 through the chute 5, and finally, it is transported to the charging section 8 of the electric furnace by the chain plate conveyor 6 until it is transported into the electric furnace to complete the smelting.

[0040] The arrangement of two transport units in this embodiment enables the feeding system for adding scrap steel to the electric furnace to have a dual channel, thereby significantly improving the feeding efficiency of scrap steel through dual channel transportation, shortening the feeding time, and further shortening the scrap steel smelting cycle.

[0041] Among them, as needed, a dust cover 7 can be further provided above the chain conveyor 6 of this embodiment, and the lower end of the slide pipe 5 passes through the dust cover 7 and extends into the dust cover 7, and the lower end of the slide pipe 5 is located above the chain conveyor 6.

[0042] In order to continuously complete the scrap steel feeding task and ensure the life of the equipment, the parts of the vibrating feeder 4 that are in contact with the scrap steel blocks are provided with wear-resistant linings, which are replaceable.

[0043] In this embodiment, the parts in contact with the scrap steel blocks, such as the chute 5, the gate valve 3, and the vibrating feeder 4, are all wear-resistant, so that continuous feeding can be achieved and the life of the equipment can be guaranteed. In addition, due to the harsh working environment, in order to avoid equipment damage affecting production, the vibrating feeder 4 and the chute 5 can also be quickly replaced.

[0044] The feeding system for adding scrap steel to an electric furnace according to an embodiment of the present invention can reduce the feeding time for smelting all scrap steel to about 20 minutes, so that the electric furnace smelting cycle can be controlled within 36 minutes; the feeding system according to an embodiment of the present invention can improve the grade of molten steel, improve the metal recovery rate, and shorten the smelting cycle; the feeding system according to an embodiment of the present invention has a chain conveyor 6, and the first span of scrap steel and the second span of scrap steel share the same chain conveyor 6, which can reduce infrastructure and equipment investment.

[0045] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0046] In addition, the terms "one", "two", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0047] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A feeding system for adding scrap steel to an electric furnace, characterized in that: It comprises a chain conveyor, which is used to transport scrap steel blocks to the charging section of the electric furnace. Transport units are arranged on both sides of the chain conveyor, and the two transport units are used to transport scrap steel blocks to the chain conveyor.

2. The feeding system for adding scrap steel to an electric furnace according to claim 1, characterized in that: One of the transport units includes an electromagnetic suction cup crane or a steel grabber, which is used to transport scrap steel blocks in the scrap steel pool to the chain conveyor. The electromagnetic suction cup crane or the steel grabber is also used to transport scrap steel blocks to the scrap steel pool for temporary storage.

3. The feeding system for adding scrap steel to an electric furnace according to claim 1, characterized in that: Another of the transport units includes a vibrating feeder, the discharge port of the vibrating feeder is located above the chain conveyor, and the vibrating feeder is used to vibrate the scrap steel blocks on the vibrating feeder to drop onto the chain conveyor.

4. The charging system for adding scrap steel to an electric furnace according to claim 3, characterized in that: The discharge port of the vibrating feeder is connected with a chute, the chute is inclined, and the lower end of the chute is located above the chain conveyor. The vibrating feeder is used to vibrate the scrap steel blocks on it to fall onto the chain conveyor through the chute.

5. The charging system for adding scrap steel to an electric furnace according to claim 4, characterized in that: A wear-resistant lining is arranged in the slide pipe, and the wear-resistant lining is detachably connected to the slide pipe.

6. The charging system for adding scrap steel to an electric furnace according to claim 3, characterized in that: A gate valve is provided at the discharge port of the vibrating feeder, and the gate valve is used to control the flow rate of the scrap steel blocks flowing out of the discharge port.

7. The charging system for adding scrap steel to an electric furnace according to claim 6, characterized in that: The portion of the gate valve in contact with the scrap steel block is provided with a wear-resistant lining, and the wear-resistant lining is replaceable.

8. The charging system for adding scrap steel to an electric furnace according to claim 3, characterized in that: Another of the transport units also includes a crane, which is used to lift the basket containing the scrap steel blocks to the receiving bin of the vibrating feeder so that the scrap steel blocks in the basket can fall into the receiving bin after the basket is opened.

9. The charging system for adding scrap steel to an electric furnace according to claim 8, characterized in that: Another of the transport units also includes a cross-transport vehicle, which is used to transport the basket containing the scrap steel blocks to the crane.

10. The feeding system for adding scrap steel to an electric furnace according to any one of claims 3 to 9, characterized in that: Parts of the vibrating feeder in contact with the scrap steel block are provided with wear-resistant linings, and the wear-resistant linings are replaceable.

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