A lifting wire feeder for LF refining process and LF furnace assembly using the same

Abstract

The utility model discloses a kind of lifting wire feeder for LF refining process, including wire feeder body and respectively located wire feeder body both sides top wire outlet threading conduit, the wire feeder body is located wire outlet bottom and is equipped with the lifting cylinder being hingedly connected with it, the lifting cylinder and threading conduit one-to-one correspondence, each lifting cylinder power end is equipped with the hinged support for threading conduit passing, the outside of each wire feeder body wire outlet is equipped with fixed base, each threading conduit wire inlet end and fixed base hingedly connected.The utility model also discloses a kind of LF furnace assembly using lifting wire feeder for LF refining process.The utility model avoids molten steel splashing on conduit, reduces the situation of jamming and burning loss, reduces the maintenance amount and replacement frequency of conduit, prolongs the service life of conduit, and can be widely applied in steel smelting field.

Description

Technical Field

[0001] This utility model relates to the field of iron and steel smelting, and in particular to a lifting wire feeder for the LF refining process and an LF furnace assembly using the wire feeder. Background Technology

[0002] In recent years, with the rapid development of my country's steel industry, market demand has begun a strategic transformation from ordinary carbon steel to high-quality steel. The LF refining furnace, which has emerged in response to this trend, plays a particularly significant and important role in production. In order to ensure that the various component indicators of molten steel meet the national industry standards, its supporting equipment, the wire feeder, plays a particularly significant role in adding aluminum wire and calcium wire. The core function of adding aluminum wire is to effectively deoxidize steel and refine its grain structure, thereby improving its toughness and strength. The core function of adding calcium wire is to modify inclusions (turning hard and brittle alumina into ductile calcium aluminate), prevent steel from cracking, and at the same time assist in desulfurization and improve the fluidity of molten steel.

[0003] Existing wire feeding guides are mostly fixed on the water-cooled furnace cover or the wire feeder platform, resulting in poor wire feeding effect. To achieve the ideal wire feeding effect, the wire feeding guide will extend into the water-cooled furnace cover. During the refining process of molten steel, the wire feeding guide will be burned by high temperature and blocked by splashing slag, affecting normal wire feeding operation. In addition, due to the high temperature and harsh environment of the wire feeding guide, the safety is poor, and frequent replacement of the wire feeding guide leads to high cost. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the above-mentioned background technology and provide a lifting wire feeder for the LF refining process and an LF furnace assembly using the wire feeder, which avoids molten steel splashing onto the guide tube, reduces blockage and burn-out, reduces the maintenance and replacement frequency of the guide tube, extends the service life of the guide tube, improves the stability and purity of the molten steel composition, and is highly safe and low in cost.

[0005] This utility model provides a lifting wire feeder for LF refining process, including a wire feeder body and wire guides located at the top of the wire outlets on both sides of the wire feeder body. The wire feeder body is provided with a lifting cylinder at the bottom of the wire outlet, which is hinged to it. The lifting cylinder corresponds to the wire guide. Each lifting cylinder has a hinge support at its power end for the wire guide to pass through. Each wire feeder body has a fixed seat on the outside of the wire outlet, and the wire inlet end of each wire guide is hinged to the fixed seat.

[0006] In the above technical solution, the threading conduit is an arc-shaped structure with the port facing downwards.

[0007] In the above technical solution, the lifting cylinders are all connected to an external air source through air pipelines. Each lifting cylinder has an air inlet at the bottom of its side wall that is connected to the air outlet of the air pipeline, and an air outlet at the top of its side wall that is connected to the air inlet of the air pipeline.

[0008] In the above technical solution, the air pipeline is equipped with a pneumatic solenoid valve that controls the lifting and lowering of the power end of the lifting cylinder.

[0009] In the above technical solution, the inner sides of the two fixed seats of the wire feeder body are respectively provided with supports, and the two supports are provided with channel steel brackets in the shape of a U-shape, with two ends of one side respectively hinged to them. The two ends of the other side of the channel steel brackets are respectively fixedly connected to the corresponding wire guide tubes through sleeves.

[0010] In the above technical solution, the gas pipeline is equipped with a pneumatic throttle valve to control the gas pressure.

[0011] In the above technical solution, the upper part of the wire feeder body is provided with wire feeding lines on both sides connected to the wire outlet. Multiple motors are evenly distributed on the inner side of each wire feeding line along its direction, and each motor output shaft is provided with a pressure roller for clamping and feeding the wire.

[0012] In the above technical solution, each motor is equipped with a straightening cylinder at the top, with the piston rod fixedly connected to its outer wall.

[0013] In the above technical solution, the two fixed seats, the two supports and the corresponding conduits are respectively connected to form a hinge structure by a pin, a bushing coaxially connected to the pin and a round nut; the pneumatic solenoid valve is provided with a pneumatic triplet for gas filtration, pressure reduction and lubrication between itself and the external air source.

[0014] This utility model also provides an LF furnace assembly for a lifting wire feeder used in the LF refining process, having an LF furnace located below two wire guides on the wire feeder body.

[0015] This utility model relates to a lifting wire feeder for the LF refining process and an LF furnace assembly using the wire feeder, which has the following beneficial effects: 1. Reduce pipe blockage and burn-out: The lifting pipe can be raised to a high position when not in use, preventing molten steel from splashing onto the pipe, reducing blockage and burn-out, lowering the maintenance and replacement frequency of the pipe, and extending the service life of the pipe. 2. Improve wire feeding effect and molten steel quality. The descent position of the guide tube can be flexibly adjusted according to the height of the molten steel and the requirements of the wire feeding process to ensure that the angle of the wire entering the molten steel and the distance between the wire and the molten steel surface are appropriate, stabilize the wire absorption rate, and thus improve the stability and purity of the molten steel composition. 3. Reduced production costs: As the blockage and burn-out of the conduit decrease, the replacement frequency is reduced, which reduces both material costs and the time cost of replacing the conduit. At the same time, the stable wire feeding effect also helps to improve the alloy yield, further reducing production costs. 4. Enhance operational safety, avoid process accidents such as wire rolling and splashing during wire feeding, reduce operators' contact with high-temperature molten steel, and reduce labor intensity and safety risks; 5. Adapting to different production needs: For ladles with different clearances or different wire feeding processes, the lifting guide can be adjusted in height to adapt, improving the equipment's versatility and flexibility. Attached Figure Description

[0016] Figure 1 This is a front view of the structure of the lifting wire feeder of this utility model used in the LF refining process; Figure 2 This is a top view of the structure of the lifting wire feeder of this utility model used in the LF refining process; Figure 3 This is a structural diagram of the LF furnace assembly of the lifting wire feeder used in the LF refining process according to this utility model. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments, but these embodiments should not be construed as limiting the present invention.

[0018] Example 1 See Figures 1 to 2 This utility model relates to a lifting wire feeder for the LF refining process, comprising a wire feeder body 1 and wire guide tubes 2 located at the top wire outlets on both sides of the wire feeder body 1. The wire guide tubes 2 effectively change the wire feeding trajectory, ensuring accurate delivery to the molten steel. A lifting cylinder 3 is hinged to the bottom of the wire outlet of the wire feeder body 1. Each lifting cylinder 3 corresponds to a wire guide tube 2 and serves as the actuator for lifting, enabling switching between working and waiting positions. Each lifting cylinder 3 has a hinge support 4 at its power end for the wire guide tube 2 to pass through. The hinge support 4 is used to fix the wire guide tube 2 and connects to the power end of the lifting cylinder 3, facilitating its lifting action. A fixing seat 5 is located on the outer side of the wire outlet of each wire feeder body 1, and the wire inlet end of each wire guide tube 2 is hinged to the fixing seat 5.

[0019] Example 2 This embodiment is basically the same as Embodiment 1, except that: See Figures 1 to 2 The threading conduit 2 is an arc-shaped structure with the port facing downwards.

[0020] The lifting cylinders 3 are all connected to an external air source through air pipelines 6. Each lifting cylinder 3 has an air inlet at the bottom of its side wall that is connected to the air outlet of the air pipeline 6, and an air outlet at the top of its side wall that is connected to the air inlet of the air pipeline 6.

[0021] The air pipeline 6 is equipped with a pneumatic solenoid valve 7 that controls the lifting and lowering of the power end of the lifting cylinder 3. In this embodiment, the pneumatic solenoid valve 7 is a two-position five-way pneumatic solenoid valve. The pneumatic solenoid valve 7 is the control element for this lifting and lowering. When the conduit 2 is energized, it lowers; when de-energized, it lifts.

[0022] The inner sides of the two fixed seats 5 of the wire feeder body 1 are respectively provided with supports 8. The two supports 8 are provided with channel steel brackets 9 in the shape of a U-shape, which are hinged to the two ends of one side. The two ends of the other side of the channel steel bracket 9 are respectively fixedly connected to the corresponding wire guide tube 2 through sleeves. The 10# channel steel bracket 9 is a connecting structural component, which is intended to ensure the synchronicity of the two lifting cylinders 3 when they are raised and lowered.

[0023] The air pipeline 6 is equipped with a pneumatic throttle valve 10 for controlling air pressure. The pneumatic throttle valve 10 is the control and adjustment element for this lifting and lowering. According to the actual situation on site, the flow rate can be adjusted to reduce the impact caused by air pressure transmission.

[0024] The upper part of the wire feeder body 1 is provided with wire feeding lines connected to the wire outlet on both sides. Multiple motors 11 are evenly distributed on the inner side of each wire feeding line along its direction. Each motor 11 has a clamping wire feeding mechanism on its output shaft.

[0025] Each motor 11 has a straightening cylinder 12 at its top, with the piston rod fixedly connected to its outer wall.

[0026] Furthermore, the two fixed seats 5, the two supports 8, and the corresponding conduits 2 are respectively connected to form a hinged structure via a pin 13, a bushing 14 coaxially connected to the pin 13, and a round nut 15; a pneumatic triplet 16 for gas filtration, pressure reduction, and lubrication is provided between the pneumatic solenoid valve 7 and the external air source. The pin 13 can connect the fixed seat 5 and the channel steel bracket 9; the bushing 14 is made of bronze alloy and acts as a sliding bearing support in this mechanism, ensuring that the channel steel bracket 9 moves flexibly without jamming; the round nut 15 and the locking washer can ensure that the pin 13 is not loosened and prevent accidental detachment.

[0027] Example 3 This embodiment is basically the same as embodiment 2, except that: See Figure 3 This utility model utilizes the LF furnace assembly of a lifting wire feeder used in the LF refining process, which has an LF furnace located below two wire guide tubes 2 of the wire feeder body 1.

[0028] During the converter tapping process, deoxidizers, ferroalloys, and synthetic slag are added to the molten steel ladle below the furnace according to the steel grade requirements for pre-deoxidation, alloying, and pre-desulfurization. After tapping, the molten steel ladle car is driven to the molten steel receiving bay, where a 225t crane lifts the ladle to the LF furnace ladle-setting position. The bottom-blowing argon system is then activated to stir the molten steel. The ladle is then moved to the processing position, the furnace cover is lowered, temperature is measured and sampled, the electrodes are lowered and energized for heating, and slag-forming materials are automatically added to the furnace through the charging system for foamed slag submerged arc refining. The molten steel is heated for about 6 minutes. Based on the test results, the type and weight of ferroalloys to be added are calculated, and the ferroalloys are automatically added to the furnace through the charging system for fine-tuning of the composition. Throughout the heating process, the operator observes the color, fluidity, and foaming of the refined slag through the furnace door. As needed, appropriate amounts of deoxidizers and foaming agents are added through the furnace door, or the main control room can be notified to add appropriate amounts of slag through the charging system. After heating for about 6 minutes, the temperature is measured and samples are taken again until the composition and temperature of the molten steel reach the target requirements. Then, according to the steel grade, Al wire, silicon-calcium wire, etc. are fed in to change the morphology of inclusions. Soft argon blowing is performed, the furnace cover and electrodes are lifted, and then the furnace is moved to the ladle station. A 225t crane is used to lift the molten steel ladle to the continuous casting station.

[0029] The wire feeder is used to feed Al and Si-Ca wires into the ladle to adjust the composition of the molten steel and to perform inclusion modification treatment. This lifting wire feeder used in the LF refining process consists of two parts: the wire feeder body 1 and the wire feeding frame. The metal wire is placed on the turntable of the wire feeding frame, and the wire feeder body 1 pulls out and straightens the metal wire, which then enters the molten steel through the wire threading guide 2.

[0030] Since its implementation, the lifting wire feeder used in the LF refining process has operated smoothly and can meet the production process requirements of different steel grades, providing a strong guarantee for the research and development of high-quality steel.

[0031] The design concept of this utility model is: 1. During the wire feeding process, wear is inevitable for the wire threading conduit 2. This utility model requires that the wire threading conduit 2 be replaced quickly and efficiently, and can be easily replaced by simply loosening the top screw, thereby reducing the labor intensity of workers. 2. When the wire guide tube 2 is too far from the molten steel during normal use, it is easy for the wire to get tangled or splash. If it is too close to the molten steel, it is easy to burn the wire guide tube 2, causing the tube opening to be blocked due to high temperature. This utility model can be raised when not in use and lowered to the working position when in use. 3. To ensure the flexibility of lifting and lowering of the conduit 2, a pneumatic solenoid valve 7 of the same specification as the pressure roller (spare parts interchangeable) is used to drive the lifting cylinder 3. The pneumatic throttle valve 10 can adjust the flow rate on the air line 6, thereby controlling the lifting speed and reducing impact. 4. This utility model uses locally sourced materials, reducing capital investment, is easy to operate, safe and reliable, and runs smoothly.

[0032] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

[0033] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

Claims

1. A lifting wire feeder for LF refining process, comprising a wire feeder body (1) and wire guides (2) located at the top wire outlets on both sides of the wire feeder body (1), characterized in that: The body (1) of the wire feeder is provided with a lifting cylinder (3) at the bottom of the wire outlet, which is hinged to it. The lifting cylinder (3) corresponds to the threading guide (2) one by one. The power end of each lifting cylinder (3) is provided with a hinge support (4) for the threading guide (2) to pass through. The outside of the wire outlet of each wire feeder body (1) is provided with a fixed seat (5). The wire inlet end of each threading guide (2) is hinged to the fixed seat (5).

2. The lifting wire feeder for the LF refining process according to claim 1, characterized in that: The threading conduit (2) is an arc-shaped structure with the port facing downwards.

3. The lifting wire feeder for the LF refining process according to claim 2, characterized in that: The lifting cylinders (3) are all connected to an external air source through air pipelines (6). Each lifting cylinder (3) has an air inlet at the bottom of its side wall that is connected to the air outlet of the air pipeline (6), and an air outlet at the top of its side wall that is connected to the air inlet of the air pipeline (6).

4. The lifting wire feeder for the LF refining process according to claim 3, characterized in that: The air pipeline (6) is equipped with a pneumatic solenoid valve (7) that controls the lifting of the power end of the lifting cylinder (3).

5. The lifting wire feeder for the LF refining process according to claim 4, characterized in that: The inner sides of the two fixed seats (5) of the wire feeder body (1) are respectively provided with supports (8). The two supports (8) are provided with channel steel brackets (9) in the shape of a square, with two ends of one side respectively hinged to them. The two ends of the other side of the channel steel brackets (9) are respectively fixedly connected to the corresponding wire guides (2) through sleeves.

6. The lifting wire feeder for the LF refining process according to claim 5, characterized in that: The gas pipeline (6) is equipped with a pneumatic throttle valve (10) for controlling gas pressure.

7. The lifting wire feeder for the LF refining process according to claim 6, characterized in that: The upper part of the body (1) of the wire feeder is provided with wire feeding lines connected to the wire outlet on both sides. Multiple motors (11) are evenly distributed on the inner side of each wire feeding line along its direction. Each motor (11) has a pressure roller for clamping and feeding wire on its output shaft.

8. The lifting wire feeder for the LF refining process according to claim 7, characterized in that: Each motor (11) has a straightening cylinder (12) at the top with a piston rod fixedly connected to its outer wall.

9. The lifting wire feeder for the LF refining process according to claim 8, characterized in that: Two fixed seats (5), two supports (8) and corresponding conduits (2) are connected to each other by a pin (13), a bushing (14) coaxially connected to the pin (13) and a round nut (15) to form a hinge structure; the pneumatic solenoid valve (7) is provided with a pneumatic triplet (16) for gas filtration, pressure reduction and lubrication between it and the external air source.

10. An LF furnace assembly employing a lifting wire feeder for the LF refining process as described in any one of claims 1 to 9, characterized in that: The LF furnace is located below two threading conduits (2) of the wire feeder body (1).

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