Electrode lifting device for refining furnace

Abstract

This utility model discloses an electrode lifting device for a refining furnace, including a lifting column, a conductive crossarm, a lifting cylinder, an electrode clamp, and an electrode clamp. The lifting cylinder is mounted on a concrete foundation and connected to the lifting column. The conductive crossarm is mounted on the lifting column, and the electrode clamp and electrode clamp are mounted on the conductive crossarm. A cable is connected to the conductive crossarm, and a balance support rod is located at the rear of the conductive crossarm. A fixed pulley is mounted on the balance support rod, and the cable passes over the fixed pulley and connects to a counterweight. The counterweight of this utility model generates an upward pulling force on the cantilever end of the conductive crossarm through the cable, balancing the torque generated by the weight of the electrode and the conductive crossarm itself. This ensures balanced force on the lifting column, reduces the impact during lifting and stopping, suppresses electrode swaying, ensures arc stability, and improves heating efficiency. Furthermore, the lifting cylinder mainly overcomes friction and inertial forces, rather than all gravity, reducing the required thrust and achieving energy saving and consumption reduction.

Description

Technical Field

[0001] This utility model relates to the technical field of refining furnace equipment, specifically to an electrode lifting device for a refining furnace. Background Technology

[0002] The LF refining furnace is an indispensable key piece of equipment in modern metallurgy. Its main function is to further refine the molten iron obtained from primary furnaces such as converters and electric arc furnaces. In the production of ferromanganese alloys, refining furnaces are required for fine-tuning the alloy composition and desulfurization. Through an electrode lifting device, electrodes are inserted into the ladle and heated by an electric arc, enabling precise control of the molten iron temperature, fine-tuning of the alloy composition, and deep desulfurization, thereby significantly improving the purity and quality of the steel.

[0003] The electrode lifting mechanism is a core component of the LF refining furnace, and its performance directly affects the stability of the refining process, heating efficiency, and energy consumption. Traditional electrode lifting mechanisms mainly use direct hydraulic cylinder drive. The hydraulic cylinder needs to directly overcome the entire weight of the electrode, conductive crossarm, and other moving parts, requiring the hydraulic system to have a large output power, resulting in high energy consumption. More importantly, since the conductive crossarm is usually a cantilever structure with the electrode suspended at its front end, the center of gravity of the entire cantilever system is biased towards the front. The lifting column must bear the eccentric torque generated by the weight of the conductive crossarm, the electrode itself, and the dynamic load. When the lifting cylinder starts, stops, or changes speed, it is prone to violent impacts due to torque imbalance, causing the electrode to sway significantly, disrupting the continuity and stability of the electric arc, and leading to a decrease in heating efficiency. Summary of the Invention

[0004] The main objective of this invention is to overcome the deficiencies of the prior art and provide an electrode lifting device for refining furnaces.

[0005] To achieve the above objectives, this utility model proposes an electrode lifting device for a refining furnace, comprising a lifting column, a conductive horizontal arm, a lifting cylinder, an electrode clamp, and an electrode clamp. The lifting cylinder is vertically mounted on a concrete foundation, and its extended end is connected to the bottom end of the lifting column. The conductive horizontal arm is horizontally fixed to the top of the lifting column, forming a cantilever. The electrode clamp and the electrode clamp are located at the front end of the conductive horizontal arm. A cable is connected to the cantilever end of the conductive horizontal arm. A balance support rod is provided at the rear of the conductive horizontal arm, and a fixed pulley is provided at the top of the balance support rod. The cable extends backward and upward, passing over the fixed pulley, and a counterweight is connected to the tail end of the cable.

[0006] To further optimize the technical solution, a first frame is provided on the concrete foundation, the lifting column is installed inside the first frame, a first guide rail is provided on the outer side of the lifting column, and a first guide wheel corresponding to the first guide rail is provided inside the first frame.

[0007] To further optimize the technical solution, a second frame is provided next to the first frame, the counterweight is set inside the second frame, and the bottom end of the balance support rod is fixed to the top of the second frame.

[0008] To further optimize the technical solution, the side wall of the counterweight is provided with a second guide wheel, and a second guide rail corresponding to the second guide wheel is vertically provided inside the second frame.

[0009] To further optimize the technical solution, both the first guide rail and the second guide rail adopt V-shaped guide roller guide rails, and the first guide wheel and the second guide rail adopt V-shaped rollers.

[0010] To further optimize the technical solution, a trigger stop is provided at the tail end of the conductive cross arm, and a travel limit switch corresponding to the trigger stop is provided at the upper and lower ends of the balance support rod.

[0011] To further optimize the technical solution, a deceleration travel switch is provided on the balance support rod, and the deceleration travel switch is respectively located between the two travel limit switches.

[0012] To further optimize the technical solution, an insulating plate is provided at the top of the lifting column, and a first insulating sleeve is provided on the conductive cross arm. The first insulating sleeve has mounting ears at both ends, and the mounting ears are fixedly connected to the insulating plate by locking bolts.

[0013] To further optimize the technical solution, a second insulating sleeve is fitted on the cantilever end of the conductive cross arm, and a pull ring is provided on the second insulating sleeve. One end of the pull cable is fixedly connected to the pull ring.

[0014] To further optimize the technical solution, an insulating pad is provided at the tail end of the conductive cross arm, and the trigger block is mounted on the insulating pad.

[0015] The beneficial effects of this utility model include: the counterweight generates an upward pulling force on the cantilever end of the conductive crossarm through the cable; when the electrode rises, the counterweight falls, and when the electrode falls, the counterweight rises; the inertial forces generated by the two are in opposite directions and cancel each other out, balancing the torque generated by the weight of the electrode and the conductive crossarm itself, so that the lifting column is subjected to balanced forces and achieves dynamic balance, which can significantly reduce the impact generated when lifting starts and stops, suppress electrode swaying, ensure arc stability, and improve heating efficiency; moreover, the lifting cylinder mainly overcomes friction and inertial forces, rather than all gravity, thus reducing the required thrust and achieving energy saving and consumption reduction. Attached Figure Description

[0016] Figure 1 This is an overall schematic diagram of the electrode lifting device in an embodiment of this utility model.

[0017] Figure 2 This is a schematic diagram showing the connection between the lifting column, conductive cross arm, lifting cylinder, cable and counterweight in an embodiment of this utility model.

[0018] Figure 3 This is a schematic diagram of the first frame in an embodiment of this utility model.

[0019] Figure 4 This is a schematic diagram of the second frame in an embodiment of this utility model.

[0020] Figure 5 This is a schematic diagram of the balance support rod in an embodiment of this utility model.

[0021] Figure 6 This is a schematic diagram of the first insulating sleeve in an embodiment of this utility model.

[0022] Reference numerals: 1 Lifting column; 2 Conductive cross arm; 3 Lifting cylinder; 4 Electrode clamp; 5 Electrode clamp; 6 Concrete foundation; 7 Cable; 8 Balance support rod; 9 Fixed pulley; 10 Counterweight; 11 First frame; 12 Second frame; 13 First guide wheel; 14 Second guide wheel; 15 Second guide rail; 16 Triggering block; 17 Limit switch; 18 Deceleration limit switch; 19 Insulating plate; 20 First insulating sleeve; 21 Mounting ear; 22 Locking bolt; 23 Second insulating sleeve; 24 Pull ring; 25 Insulating gasket; 26 Electrode; 27 Steel ladle; 28 Water-cooled cable; 29 First guide rail. Detailed Implementation

[0023] To make the technical problems, technical solutions, and beneficial effects of the embodiments of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0024] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as "connected to" another component, it can be directly connected to or indirectly connected to that other component. Furthermore, a connection can be for both fixing and circuit connection purposes.

[0025] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] Please see Figures 1 to 6This embodiment discloses an electrode lifting device for a refining furnace, including a lifting column 1, a conductive horizontal arm 2, a lifting cylinder 3, an electrode clamp 4, and an electrode clamp 5. The lifting cylinder 3 is vertically mounted on a concrete foundation 6, and the extended end of the lifting cylinder 3 is connected to the bottom end of the lifting column 1. The conductive horizontal arm 2 is horizontally fixed to the top of the lifting column 1 to form a cantilever. The electrode clamp 4 and the electrode clamp 5 are located at the front end of the conductive horizontal arm 2 and are used to clamp the electrode 26. A cable 7 is connected to the cantilever end of the conductive horizontal arm 2. A balance support rod 8 is provided at the rear of the conductive horizontal arm 2. A fixed pulley 9 is provided at the top of the balance support rod 8. The cable 7 extends backward and upward, passes over the top surface of the fixed pulley 9, and then descends vertically. A counterweight 10 is connected to the tail end of the cable 7. Specifically, the lifting column 1, conductive crossarm 2, lifting cylinder 3, electrode clamp 4, and electrode clamp 5 are each equipped with three sets. That is, the three sets of electrode lifting devices drive the three electrodes 26 to lift and lower independently, inserting into or rising from the steel ladle 27 below. The electrode clamp 4 and electrode clamp 5 at the ends of the three conductive crossarms 2 are arranged in a triangle and are on the same plane. The tail of the three conductive crossarms 2 is connected to an external transformer through a water-cooled cable 28. The lifting cylinder 3 is connected to an external hydraulic station. The lifting cylinder 3 is a plunger hydraulic cylinder, and the return section is reset by a spring. Of course, a combination structure of two plunger hydraulic cylinders installed opposite each other can also be used to achieve bidirectional drive. The electrode clamp 4 and electrode clamp 5 are existing technology products, and their specific structures will not be described in detail here. They only need to be able to clamp or release the electrode 26. The cable 7 is made of steel wire rope. The head end of the cable 7 is fixedly connected to the cantilever end of the conductive cross arm 2. After passing through the fixed pulley 9 in the middle, it is vertically connected to the counterweight 10. The height of the balance support rod 8 is greater than the lifting stroke of the conductive cross arm 2. When the electrode 26 rises, the counterweight 10 falls, and when the electrode 26 falls, the counterweight 10 rises. The inertial forces generated by the two are in opposite directions and cancel each other out. In this embodiment, the counterweight 10 generates an upward pulling force on the cantilever end of the conductive crossarm 2 through the cable 7, which balances the torque generated by the weight of the electrode 26 and the conductive crossarm 2 itself, so that the lifting column 1 is subjected to balanced forces and achieves dynamic balance. This can significantly reduce the impact generated when lifting starts and stops, suppress the shaking of the electrode 26, ensure the stability of the electric arc, and improve heating efficiency. Moreover, the lifting cylinder 3 mainly overcomes friction and inertial forces, rather than the entire weight of the lifting column 1, conductive crossarm 2, electrode 26 and counterweight 10, etc., so the required thrust is reduced, the load fluctuation of the lifting cylinder 3 is small, and the operation is more stable. A smaller power hydraulic station can be used to provide power, achieving energy saving and consumption reduction.

[0028] In a specific example, a first frame 11 is provided on a concrete foundation 6. Three sets of lifting columns 1 are arranged vertically inside the first frame 11. A first guide rail 29 is provided on the outer side of the lifting column 1. The first frame 11 is provided with first guide wheels 13 corresponding to the first guide rail 29. The lifting column 1 is made of seamless steel pipe and steel plate welded into a rectangular structure. The first guide rail 29 is vertically set on the four sides. The first guide wheels 13 are arranged in two layers. Each set of lifting columns 1 has four first guide wheels 13 arranged at 90° intervals around the first layer. The first guide rail 29 passes through the middle of the four first guide wheels 13 and forms a tight fit with the first guide wheels 13, so that the lifting column 1 can be vertically raised and lowered within the first frame 11 under the guidance of the first guide wheels 13. This effectively constrains the movement trajectory of the lifting column 1, prevents it from horizontally deviating or twisting during the lifting process, and ensures the precise positioning of the electrode 26. Moreover, when the lifting column 1 is kept under balanced force, the pressure on each first guide wheel 13 is evenly distributed, which can effectively prevent the first guide wheel 13 from being worn faster due to overload, thereby extending its service life.

[0029] In a preferred embodiment, a second frame 12 is provided next to the first frame 11. The counterweight 10 is disposed inside the second frame 12 and can slide and move up and down. The bottom end of the balance support rod 8 is fixed to the top of the second frame 12. The second frame 12 provides a closed, vertical lifting channel for the counterweight 10, restricting the swing of the counterweight 10, ensuring the pulling force is vertical, and improving the stability of the system.

[0030] In a preferred embodiment, the counterweight 10 is a rectangular block, with second guide wheels 14 respectively provided on the side walls around the counterweight 10, and second guide rails 15 corresponding to the second guide wheels 14 vertically provided inside the second frame 12. The cooperation between the second guide wheels 14 and the second guide rails 15 guides and constrains the movement of the counterweight 10 along the second guide rails 15, restricts the swing of the counterweight 10, ensures that the pulling force is always vertical, and at the same time transforms sliding friction into rolling friction, resulting in less resistance, less wear, and smoother operation.

[0031] In a preferred embodiment, both the first guide rail 29 and the second guide rail 15 are V-shaped guide roller guide rails, and the first guide wheel 13 and the second guide rail 15 are V-shaped rollers. The rolling of the V-shaped rollers on the surface of the V-shaped guide roller guide rails involves contact between two lines that are oblique to the central axis of the V-shaped rollers. When the rollers rotate, they can continuously and instantaneously scrape the guide rail surface, removing dust, debris, and other contaminants deposited on the surface of the V-shaped guide roller guide rails, keeping the guide rail surface clean, and effectively preventing unstable movement or damage caused by impurities stuck on the rail surface due to the high temperature and dusty harsh environment around the refining furnace; moreover, the embedded cooperation between the V-shaped rollers and the V-shaped guide roller guide rails can provide strong anti-left and right swaying ability.

[0032] In a specific example, a trigger block 16 is provided at the tail end of the conductive crossarm 2, and a travel limit switch 17 corresponding to the trigger block 16 is provided at the upper and lower ends of the balance support rod 8, respectively. The travel limit switch 17 is set at the positions corresponding to the highest point when the balance support rod 8 rises and the lowest point when the conductive crossarm 2 falls, realizing upper and lower limit positions. When the trigger block 16 rises to the highest point or falls to the lowest point with the conductive crossarm 2, the trigger block 16 can trigger the travel limit switch 17, feeding back the control signal to the external hydraulic station to control the start and stop of the lifting cylinder 3, thus realizing upper and lower limit protection.

[0033] In a preferred embodiment, a deceleration travel switch 18 is provided on the balance support rod 8, and the deceleration travel switch 18 is respectively located between the two travel limit switches 17. Specifically, the deceleration travel switch 18 is located in the front section near the two travel limit switches 17. When the trigger block 16 triggers the travel limit switch 17, it first triggers the deceleration travel switch 18 and sends a feedback signal back to the hydraulic station to control the reduction of the speed of the lifting cylinder 3, so that the electrode 26 smoothly transitions from high-speed movement to low-speed creeping, avoiding the electrode 26 suddenly stopping and generating impact force when only the travel limit switch 17 performs the final limit.

[0034] In a specific example, an insulating plate 19 is fixedly installed at the top of the lifting column 1, and a first insulating sleeve 20 is installed on the conductive cross arm 2. The first insulating sleeve 20 has mounting ears 21 at both ends, and the mounting ears 21 are fixedly connected to the insulating plate 19 by locking bolts 22. A second insulating sleeve 23 is fitted on the cantilever end of the conductive cross arm 2, and a pull ring 24 is provided on the second insulating sleeve 23. One end of the pull cable 7 is fixedly connected to the pull ring 24. An insulating pad 25 is provided at the tail end of the conductive cross arm 2, and a trigger block 16 is installed on the insulating pad 25. Of course, the trigger block 16 can be made directly of insulating material. The insulating plate 19 can be made of epoxy resin laminate or high-performance phenolic laminate. The first insulating sleeve 20 and the second insulating sleeve 23 are made of polyurethane or nylon braided layer reinforced rubber material. The insulating pad 25 can be made of polytetrafluoroethylene or mica material. The conductive cross arm 2 is physically isolated from the grounded lifting column 1 by the insulating plate 19 and the first insulating sleeve 20 to prevent short circuit; the connection between the cable 7 and the conductive cross arm 2 is isolated by the second insulating sleeve 23 to achieve insulation at the interface of the cable 7; and the trigger block 16 is insulated by the insulating pad 25 to prevent the current on the conductive cross arm 2 from leaking through an unexpected path.

[0035] The above description, in conjunction with specific / preferred embodiments, provides a further detailed explanation of the present invention and should not be construed as limiting the specific implementation of the present invention to these descriptions. For those skilled in the art, various substitutions or modifications can be made to these described embodiments without departing from the concept of the present invention, and all such substitutions or modifications should be considered within the protection scope of the present invention. In the description of this specification, the reference to terms such as "an embodiment," "some embodiments," "preferred embodiment," "example," "specific example," or "some examples," etc., indicates that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the described specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification and the features of different embodiments or examples. Although embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations may be made herein without departing from the scope of protection of the patent application.

Claims

1. An electrode lifting device for a refining furnace, comprising a lifting column, a conductive crossarm, a lifting cylinder, an electrode clamp, and an electrode clamp, characterized in that: The lifting cylinder is vertically mounted on a concrete foundation. The extended end of the lifting cylinder is connected to the bottom end of the lifting column. The conductive cross arm is horizontally fixed to the top of the lifting column to form a cantilever. The electrode clamp and the electrode clamp are located at the front end of the conductive cross arm. A cable is connected to the cantilever end of the conductive cross arm. A balance support rod is provided at the rear of the conductive cross arm. A fixed pulley is provided at the top of the balance support rod. The cable extends backward and upward, passing over the fixed pulley. A counterweight is connected to the tail end of the cable.

2. The electrode lifting device as described in claim 1, characterized in that: A first frame is provided on the concrete foundation, the lifting column is installed inside the first frame, a first guide rail is provided on the outer side of the lifting column, and a first guide wheel corresponding to the first guide rail is provided inside the first frame.

3. The electrode lifting device as described in claim 2, characterized in that: A second frame is provided next to the first frame, the counterweight is set inside the second frame, and the bottom end of the balance support rod is fixed to the top of the second frame.

4. The electrode lifting device as described in claim 3, characterized in that: The counterweight is provided with a second guide wheel on its side wall, and a second guide rail corresponding to the second guide wheel is vertically provided inside the second frame.

5. The electrode lifting device as described in claim 4, characterized in that: Both the first guide rail and the second guide rail adopt V-shaped guide roller guide rails, and the first guide wheel and the second guide rail adopt V-shaped rollers.

6. The electrode lifting device as described in claim 5, characterized in that: A trigger stop is provided at the tail end of the conductive cross arm, and a travel limit switch corresponding to the trigger stop is provided at the upper and lower ends of the balance support rod.

7. The electrode lifting device as described in claim 6, characterized in that: A deceleration travel switch is provided on the balance support rod, and the deceleration travel switch is respectively located between the two travel limit switches.

8. The electrode lifting device as described in claim 7, characterized in that: An insulating plate is provided at the top of the lifting column, and a first insulating sleeve is provided on the conductive cross arm. The first insulating sleeve has mounting ears at both ends, and the mounting ears are fixedly connected to the insulating plate by locking bolts.

9. The electrode lifting device as described in claim 8, characterized in that: A second insulating sleeve is fitted on the cantilever end of the conductive cross arm, and a pull ring is provided on the second insulating sleeve. One end of the pull cable is fixedly connected to the pull ring.

10. The electrode lifting device as described in claim 9, characterized in that: An insulating pad is provided at the tail end of the conductive cross arm, and the trigger block is mounted on the insulating pad.

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