Furnace cover lifting mechanism of LF furnace

Abstract

The utility model relates to the technical field of LF furnaces, and discloses a furnace cover lifting mechanism of an LF furnace, which comprises two symmetrically arranged stand columns, moving wheels are arranged at the lower ends of the stand columns, a steel beam is fixedly connected between the two stand columns, the steel beam is of an I-shaped steel structure, two sliding assemblies are connected on the steel beam in a sliding mode, and the two sliding assemblies are arranged on the two stand columns. A rotating rod is rotationally connected between the sliding assemblies, rotating cylinders are fixedly connected to the two ends of the rotating rod, lifting ropes are wound around the rotating cylinders, lifting hooks are arranged at the lower ends of the lifting ropes, and the lifting hooks are connected with a lifting ring installed at the upper end of the furnace cover. The LF furnace cover lifting device solves the problem that an electrode is broken due to the fact that the furnace cover inclines in the process of lifting the furnace cover and the electrode hits a furnace body of the LF furnace.

Description

Technical Field

[0001] The utility model relates to the technical field of LF furnaces, and particularly relates to a cover lifting mechanism of an LF furnace. Background Art

[0002] An LF furnace (ladle refining furnace) is a main secondary refining device in steel production and also belongs to a kind of electric arc furnace. Electrodes extending into the furnace are provided on the cover of the LF furnace, and the electrodes are used for heating steel. A lifting mechanism is also provided on the cover, and the lifting mechanism is used for lifting and lowering the cover.

[0003] The structure of the existing lifting mechanism includes a frame. Two hydraulic telescopic cylinders are provided on the frame. The two telescopic cylinders are parallel to each other and horizontally placed. A sprocket rotatably connected to the frame is provided on the front side of the telescopic cylinder. A chain is provided at the telescopic end of the telescopic cylinder. The chain extends downward after passing around the sprocket and is connected to the cover. When lifting the cover, the two telescopic cylinders contract simultaneously, and the chain moves upward to lift the cover; when lowering the cover, the two telescopic cylinders extend simultaneously, and the chain moves downward to lower the cover.

[0004] During the use process, it is found that even if the two telescopic cylinders are started simultaneously, it is difficult to keep the extension speed and the contraction speed of the two telescopic cylinders the same. Especially after long-term use and aging, due to the different aging degrees of the two telescopic cylinders, the speed difference is further enlarged, resulting in the two chains not being able to move at the same speed, and the cover will tilt. When the cover tilts, the electrode is likely to hit the furnace body of the LF furnace, causing the electrode to break. The price of the electrode is expensive, which will not only cause a large maintenance cost, but also affect the steel production. Content of the Utility Model

[0005] In order to solve the problems of the above-mentioned existing technology, the utility model adopts a cover lifting mechanism of an LF furnace, which solves the problem that the cover will tilt during the process of lifting the cover, causing the electrode to hit the furnace body of the LF furnace and resulting in the breakage of the electrode.

[0006] To achieve the above object, the utility model provides the following technical solution: A cover lifting mechanism of an LF furnace includes two symmetrically arranged columns. Moving wheels are provided at the lower ends of the columns. A steel beam is fixedly connected between the two columns. The steel beam is of I-shaped steel structure. Two sliding components are slidably connected to the steel beam. A rotating rod is rotatably connected between the sliding components. Rotating cylinders are fixedly connected to both ends of the rotating rod. A lifting rope is wound around the rotating cylinder. A hook is provided at the lower end of the lifting rope. The hook is connected to a lifting ring installed at the upper end of the cover.

[0007] With the above structural design, the hoisting rope is retracted and lowered by rotating the drum on the rotating rod, which facilitates the lifting and lowering of the furnace cover. The hoisting ropes connected to both ends of the furnace cover are arranged on one rotating rod, enabling the hoisting ropes at both ends to lift the furnace cover at the same speed, ensuring the smoothness of the furnace cover's lifting and preventing the electrodes on the furnace cover from hitting the furnace body and breaking.

[0008] Preferably, the sliding assembly includes a moving frame sleeved on the lower end of the steel beam. Two pulleys are symmetrically and rotatably connected to the inner wall of the moving frame. The pulleys are in contact with the lower flange of the steel beam. One end of each pulley is connected to the output end of a rotating motor through a rotating shaft, and the drum is located within the moving frame.

[0009] With the above structural design, by driving the motor to drive the pulley to roll on the lower wing plate of the steel beam, the sliding assembly can move along the direction of the steel beam, thereby moving the furnace cover connected below it, achieving the function of slightly adjusting the position of the furnace cover, which is beneficial for quickly and accurately aligning with the furnace opening during the installation of the furnace cover to the LF furnace.

[0010] Preferably, the rotating rod includes a sleeve rod and an inner extending rod extending into the sleeve rod at one end. A plurality of fixing holes are equidistantly arranged along the length direction on the inner extending rod. Positioning bolts pass through the fixing holes and the limiting holes to fix the sleeve rod and the inner extending rod.

[0011] With the above structural design, by adjusting the length of the rotating rod to determine the distance between the two sliding assemblies, the device can then adjust the position of the hoisting rope according to the positions of the lifting rings on furnace covers of different sizes, increasing the applicability of the device.

[0012] Preferably, one end of the steel beam passes through the moving frame and is provided with a driving motor, and the driving motor is fixedly connected to the side wall of the moving frame.

[0013] With the above structural design, by starting the rotating motor to drive the rotating rod to rotate, and then driving the drums at both ends of the rotating rod to rotate at the same speed, the hoisting ropes and hooks wound around the drums are lifted and lowered at the same rate, ensuring the stability of the furnace cover during movement.

[0014] Compared with the prior art, the beneficial effects of the present utility model are:

[0015] 1. By rotating the drum on the rotating rod to retract and lower the hoisting rope, it is convenient to lift and lower the furnace cover. The hoisting ropes connected to both ends of the furnace cover are arranged on one rotating rod, enabling the hoisting ropes at both ends to lift the furnace cover at the same speed, ensuring the smoothness of the furnace cover's lifting and preventing the electrodes on the furnace cover from hitting the furnace body and breaking.

[0016] 2. The pulley is driven by a driving motor to roll on the lower flange of the steel beam, and the sliding assembly can move along the direction of the steel beam, so that the furnace cover connected below it moves, achieving the function of slightly adjusting the position of the furnace cover, which is beneficial to quickly and accurately aligning with the furnace mouth during the installation of the furnace cover to the LF furnace. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of the present utility model;

[0018] Figure 2 It is a top view schematic diagram of the sliding assembly of the present utility model;

[0019] Figure 3 It is a side view of the sliding assembly of the present utility model. Detailed Embodiment

[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0021] Please refer to Figures 1-3 , the present utility model provides a technical solution: a furnace cover lifting mechanism for an LF furnace, including two symmetrically arranged columns 1. A moving wheel 3 is provided at the lower end of the column 1. A steel beam 2 is fixedly connected between the two columns 1. The steel beam 2 is of I-shaped steel structure. Two sliding assemblies 4 are slidably connected to the steel beam 2. A rotating rod 6 is rotatably connected between the sliding assemblies 4. Rotating cylinders 9 are fixedly connected to both ends of the rotating rod 6. A lifting rope 7 is wound around the rotating cylinder 9. A hook 8 is provided at the lower end of the lifting rope 7. The hook 8 is connected to a lifting ring 12 installed at the upper end of the furnace cover 10. By rotating the rotating cylinder 9 on the rotating rod 6 to recover and lower the lifting rope 7, it is convenient to lift and lower the furnace cover 10. The lifting ropes 7 connected to both ends of the furnace cover 10 are arranged on one rotating rod 6, so that the lifting ropes 7 at both ends can lift the furnace cover 10 at the same speed, ensuring the smoothness of the lifting of the furnace cover 10 and preventing the electrode 11 on the furnace cover 10 from touching the furnace body and breaking.

[0022] The sliding assembly 4 includes a moving frame 401 sleeved on the lower end of the steel beam 2. Two pulleys 402 are symmetrically and rotatably connected to the inner wall of the moving frame 401. The pulleys 402 are in contact with the lower flange of the steel beam 2. One end of the pulley 402 of one sliding assembly 4 is connected to the output end of a rotating motor 403 through a rotating shaft. The drum 9 is located within the moving frame 401. By driving the motor 5 to drive the pulley 402 to roll on the lower wing plate of the steel beam 2, the sliding assembly 4 can move along the direction of the steel beam 2, so that the connected furnace cover 10 moves, achieving the effect of slightly adjusting the position of the furnace cover 10, which is beneficial to quickly and accurately aligning with the furnace opening during the installation of the furnace cover 10 to the LF furnace.

[0023] The rotating rod 6 includes a sleeve rod 601 and an inner extending rod 602 extending into the sleeve rod 601 at one end. A plurality of fixing holes 604 are equidistantly arranged along the length direction on the inner extending rod 602. A limiting hole 603 is provided at the position of the sleeve rod 601 corresponding to the fixing hole 604. A positioning bolt 605 passes through the fixing hole 604 and the limiting hole 603 to fix the sleeve rod 601 and the inner extending rod 602. By adjusting the length of the rotating rod 6 to determine the distance between the two sliding assemblies 4, the device can further adjust the position of the lifting ropes 7 according to the positions of the hanging rings 12 on the furnace cover 10 of different sizes, increasing the applicability of the device.

[0024] One end of the steel beam 2 passes through the moving frame 401 and is provided with a driving motor 5. The driving motor 5 is fixedly connected to the side wall of the moving frame 401. By starting the rotating motor 403 to drive the rotating rod 6 to rotate, and then driving the drums 9 at both ends of the rotating rod 6 to rotate at the same speed, the lifting ropes 7 and the hooks 8 wound around the drums 9 are lifted and lowered at the same rate, ensuring the stability of the furnace cover 10 during movement.

[0025] Working principle: The operator first adjusts the length of the rotating rod 6 according to the position of the hanging ring 12 on the furnace cover 10 so that the two lifting ropes 7 can be connected to the hanging ring 12 in a vertical state. After determining the length of the rotating rod 6, the device is moved to the position of the LF furnace, and the driving motor 5 is turned on to lower the two hooks 8 at the same speed. By driving the motor 5 to drive the pulley 402 to roll on the lower wing plate of the steel beam 2, the sliding assembly 4 can move along the direction of the steel beam 2, slightly adjusting the position of the hook 8 so that the hook 8 can be accurately connected to the hanging ring 12. After the connection is completed, the driving motor 5 is started again to rotate the drum 9 on the rotating rod 6 to retract the lifting ropes 7, so that the two lifting ropes 7 at both ends can lift the furnace cover 10 at the same speed, ensuring the smoothness of the lifting of the furnace cover 10 and preventing the electrodes 11 on the furnace cover 10 from hitting the furnace body and breaking.

[0026] The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A furnace cover lifting mechanism for a LF furnace, characterized in that: The invention comprises two symmetrically arranged columns (1), wherein the lower ends of the columns (1) are provided with moving wheels (3), a steel beam (2) is fixedly connected between the two columns (1), the steel beam (2) is an I-beam structure, two sliding components (4) are slidably connected to the steel beam (2), a rotating rod (6) is rotatably connected between the sliding components (4), a rotating drum (9) is fixedly connected to both ends of the rotating rod (6), a lifting rope (7) is wound around the rotating drum (9), a lifting hook (8) is provided at the lower end of the lifting rope (7), and the lifting hook (8) is connected to a lifting ring (12) installed at the upper end of the furnace cover (10).

2. The furnace cover lifting mechanism of a LF furnace according to claim 1, characterized in that: The sliding assembly (4) comprises a moving frame (401) sleeved on the lower end of the steel beam (2), two pulleys (402) are symmetrically rotatably connected on the inner wall of the moving frame (401), the pulleys (402) are in contact with the lower flange of the steel beam (2), one end of the pulley (402) is connected to the output end of the rotating motor (403) through a rotating shaft, and the rotating drum (9) is located in the moving frame (401).

3. The furnace cover lifting mechanism of a LF furnace according to claim 1, characterized in that: The rotating rod (6) comprises a sleeve rod (601) and an inner extension rod (602) with one end extending into the sleeve rod (601); the inner extension rod (602) is provided with a plurality of fixing holes (604) equidistantly arranged along the length direction; a limiting hole (603) is provided on the sleeve rod (601) at a position relative to the fixing hole (604); a positioning bolt (605) passes through the fixing hole (604) and the limiting hole (603) to fix the sleeve rod (601) and the inner extension rod (602).

4. The furnace cover lifting mechanism of a LF furnace according to claim 2, characterized in that: One end of the steel beam (2) passes through the mobile frame (401) and is provided with a driving motor (5), and the driving motor (5) is fixedly connected to the side wall of the mobile frame (401).

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