Rocker mechanism on electric arc melting furnace

Abstract

The rocker mechanism comprises a base and a furnace body arranged on the base, the upper end portion of the furnace body is connected with an end cover through a bolt, the lower end face of the end cover is provided with a smoke sensor, the middle of the end cover is vertically connected with an arc striking rod in a sliding mode, and the arc striking rod is connected with a rocker. The lower end of the arc striking rod is in threaded connection with an end base, a tungsten needle is movably inserted in the middle of the end base and connected with an electrifying device through a wire, a limiting plate is arranged at the upper end of the tungsten needle, the tungsten needle is sleeved with a reset spring, the reset spring is arranged above the limiting plate, a copper crucible is arranged at the lower end of an inner cavity of the furnace body, and feeding grooves are evenly distributed in the copper crucible. A lifting mechanism is arranged on the rear side of the furnace body. According to the scheme, manual operation, existing high-temperature radiation hazards and the requirement for the operation proficiency degree can be avoided, lifting of the arc striking rod is carried out along with electric arc generation in time, and adhesion of the arc striking rod and furnace charge can be further avoided.

Description

A rocker mechanism on an electric arc melting furnace Technical Field

[0001] This utility model relates to the field of electric arc melting furnace technology, specifically to a rocker mechanism on an electric arc melting furnace. Background Technology

[0002] Arc melting is an electrothermal metallurgical method that uses an electric arc generated between electrodes and furnace charge to melt metals.

[0003] In the actual electric arc melting process, the tungsten needle on the arc-igniting rod must first come into contact with the furnace charge to initiate the electric arc. Once the arc is successfully ignited, the tungsten needle must immediately detach from the furnace charge and maintain a reasonable height to ensure stable arc output.

[0004] Currently, most small electric arc melting furnaces produced in China use worm gears or threaded screws for their arc-initiating rods. Once the arc is generated, it is difficult for the operator to rotate the worm gear or threaded handle in time to raise the position of the arc-initiating rod, which can easily cause the rod to stick to the furnace charge, ultimately leading to arc ignition failure. Therefore, the above-mentioned technical solutions have the following problems: First, they require a high level of operator skill; second, manual operation can easily lead to high-temperature radiation hazards; third, the lifting and lowering operations are not timely enough, easily causing the arc-initiating rod to stick to the furnace charge. To address these issues, we propose a rocker mechanism for electric arc melting furnaces. Summary of the Invention

[0005] The purpose of this utility model is to provide a rocker mechanism for an electric arc melting furnace to solve the following problems in the existing arc ignition operation of the arc ignition rod in the electric arc melting furnace mentioned in the background art: First, it requires a high level of operator proficiency; second, manual operation is prone to high temperature radiation hazards; third, the lifting operation is not timely enough, which can easily cause the arc ignition rod and furnace charge to stick together.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a rocker mechanism for an electric arc melting furnace, comprising a base and a furnace body mounted on the base. The furnace body is provided with an operating rod, a protective door, a viewing window, a vacuum tube, and a gas filling interface. The vacuum tube and the gas filling interface are both connected to the interior of the furnace body. An end cap is bolted to the upper end of the furnace body. A smoke sensor is provided on the lower end face of the end cap. An arc-initiating rod is vertically slidably connected to the middle of the end cap. An end seat is threaded to the lower end of the arc-initiating rod. A tungsten needle is movably inserted into the middle of the end seat. The tungsten needle is connected to an electrical device via a wire. A limit plate is provided at the upper end of the tungsten needle. A return spring is sleeved above the tungsten needle and is located above the limit plate. A copper crucible is provided at the lower end of the furnace body cavity. Feed grooves are evenly distributed on the copper crucible. A lifting mechanism is provided at the rear of the furnace body.

[0007] The lifting mechanism includes a mounting base, which is fixedly mounted on the base by screws. A support plate is provided at the upper end of the mounting base. A drive assembly and a controller are fixedly mounted on the upper and lower ends of the support plate, respectively. A rack is provided on the side of the arc-inducing rod facing the mounting base. A guide rod is provided on the upper end of the rack. A scale bar is provided on the outer side of the guide rod. An adjusting sleeve is threaded onto the guide rod.

[0008] The drive assembly includes a motor and a gear. The gear is fixedly mounted on the output shaft of the motor. The gear and the rack are meshed together. The controller, the smoke sensor, and the motor are electrically connected by wires.

[0009] Preferably, the mounting base has a through slot for gear insertion, and the gear passes through the through slot.

[0010] Preferably, the center lines of the arc-initiating rod and the guide rod are parallel to each other, and both the arc-initiating rod and the guide rod are inserted into the mounting base.

[0011] Preferably, the copper crucible is located directly below the arc-starting rod, and the copper crucible and the arc-starting rod are collinear.

[0012] Preferably, a slot for inserting the end seat is provided below the arc-guiding rod.

[0013] Preferably, the end seat has a groove inside for sliding the limiting plate.

[0014] Preferably, the return spring is located between the end seat and the arc-starting rod.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. The rocker mechanism on this type of electric arc melting furnace uses a lifting mechanism installed at the rear of the furnace body to drive the arc-igniting rod. After the arc ignition operation is completed, the argon gas between the tungsten needle and the molten metal is rapidly heated, causing a sudden increase in pressure inside the furnace. This pushes the tungsten needle away from the molten metal. When the standard target distance is reached, the limiting plate is restricted by the arc-igniting rod, ensuring that the tungsten needle and the molten metal are always kept within a safe and stable distance range. At the same time, the smoke generated by the electric arc triggers the smoke alarm, which feeds the signal back to the controller. The controller then starts the motor, which causes the gear to rotate. Through the meshing of the gear and rack, the gear rotates, causing the rack to move upward, which in turn drives the arc-igniting rod to move further away from the furnace charge. This avoids the high-temperature radiation hazards and high skill requirements associated with manual operation. Furthermore, the lifting and lowering of the arc-igniting rod occurs simultaneously with the generation of the electric arc, which is timely and further prevents the arc-igniting rod from sticking to the furnace charge. Attached Figure Description

[0017] Figure 1 is a first-view structural schematic diagram of the present invention;

[0018] Figure 2 is a schematic diagram of the structure of this utility model from a second perspective.

[0019] Figure 3 is a schematic diagram of the third-view structure of this utility model;

[0020] Figure 4 is a schematic diagram of the half-section structure of this utility model;

[0021] Figure 5 is an enlarged schematic diagram of point M in Figure 4 of this utility model.

[0022] In the diagram: 1. Base; 2. Furnace body; 21. Copper crucible; 22. Feed trough; 3. Operating lever; 4. Protective door; 5. Viewing window; 6. Vacuum tube; 7. Gas filling interface; 8. Lifting mechanism; 81. Mounting seat; 82. Support plate; 83. Guide rod; 84. Adjusting screw sleeve; 85. Scale bar; 86. Arc ignition rod; 861. End seat; 862. Tungsten needle; 863. Limiting plate; 864. Return spring; 87. Drive assembly; 871. Motor; 872. Gear; 873. Controller; 88. Rack and pinion; 9. End cover. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Example: Please refer to Figures 1-5. This utility model provides a technical solution: a rocker mechanism on an electric arc melting furnace, including a base 1 and a furnace body 2 mounted on the base 1. The furnace body 2 is equipped with an operating rod 3, a protective door 4, a viewing window 5, a vacuum tube 6, and a gas filling interface 7. The vacuum tube 6 is connected to a vacuum pump, and the gas filling interface 7 is connected to an argon gas supply device. Both the vacuum tube 6 and the gas filling interface 7 are connected to the interior of the furnace body 2. An end cap 9 is bolted to the upper end of the furnace body 2. A smoke sensor 91 is mounted on the lower surface of the end cap 9. The smoke sensor 91 can receive the smoke generated by the electric arc inside the furnace body 2 in real time and provide feedback.

[0025] Please refer to Figures 1-3. An arc-inducing rod 86 is vertically slidably connected to the center of the end cap 9. An end seat 861 is threadedly connected to the lower end of the arc-inducing rod 86. A slot is provided below the arc-inducing rod 86 for insertion into the end seat 861. A tungsten needle 862 is movably inserted into the center of the end seat 861. The tungsten needle 862 is connected to an electrical device via a wire. A limit plate 863 is provided at the upper end of the tungsten needle 862. A sliding groove is provided inside the end seat 861 for sliding the limit plate 863. A return spring 864 is sleeved above the tungsten needle 862, positioned above the limit plate 863, between the end seat 861 and the arc-inducing rod 86. When the arc is successfully ignited, the argon gas between the tungsten needle 862 and the molten metal is rapidly heated, causing a sudden increase in pressure inside the furnace body 2. This pushes the tungsten needle 862 away from the molten metal. Once the standard target distance is reached, the limiting plate 863 is restricted by the arc-igniting rod 86, ensuring that the tungsten needle 862 and the molten metal are always kept within a safe and stable distance range. At the same time, as the electric arc is generated, smoke will trigger the smoke alarm 91.

[0026] Furthermore, a copper crucible 21 is provided at the lower end of the inner cavity of the furnace body 2. The copper crucible 21 is used to place the molten metal. The copper crucible 21 is located directly below the arc-starting rod 86, and the copper crucible 21 and the arc-starting rod 86 are collinear. Feed troughs 22 are evenly distributed on the copper crucible 21, and a lifting mechanism 8 is provided at the rear of the furnace body 2.

[0027] Please refer to Figure 4. The lifting mechanism 8 includes a mounting base 81, which is fixedly mounted on the base 1 by screws. A support plate 82 is provided at the upper end of the mounting base 81. A drive assembly 87 and a controller 873 are respectively fixedly mounted on the upper and lower ends of the support plate 82. A rack 88 is provided on the side of the arc-inducing rod 86 facing the mounting base 81. A guide rod 83 is provided on the upper end of the rack 88. The center lines of the arc-inducing rod 86 and the guide rod 83 are parallel to each other, and both the arc-inducing rod 86 and the guide rod 83 are inserted into the mounting base 81. A scale bar 85 is provided on the outer side of the guide rod 83, and an adjusting sleeve 84 is threaded onto the guide rod 83. After rotating the adjusting sleeve 84, the adjusting sleeve 84 can move upward or downward along the axis of the guide rod 83, thereby limiting the position of the rack 88.

[0028] Furthermore, the drive assembly 87 includes a motor 871 and a gear 872. The motor 871 is connected to a control switch via a wire. A through slot is provided on the mounting base 81 for the gear 872 to pass through. The gear 872 is fixedly mounted on the output shaft of the motor 871 and meshes with a rack and pinion 88. The controller 873, the smoke sensor 91, and the motor 871 are electrically connected via wires. When the motor 871 is turned on, the gear 872 rotates. Through the meshing action of the gear 872 and the rack and pinion 88, the rotation of the gear 872 causes the rack and pinion 88 to move upward, thereby driving the arc-initiating rod 86 to move further away from the furnace charge.

[0029] Working principle: Before use, the rocker mechanism on this type of electric arc melting furnace is evacuated through vacuum tube 6 to achieve the required process parameters. Then, argon gas is backflushed into the furnace body 2 through gas filling port 7. Once the required process parameters are achieved, controller 873 activates motor 871. Motor 871 then rotates gear 872. Through the meshing of gear 872 and rack 88, the rotation of gear 872 causes rack 88 to move downwards, bringing the arc-igniting rod 86 closer to the copper crucible 21. This brings the tungsten needle 862 closer to the molten metal, achieving arc ignition. Similarly, after arc ignition, the argon gas between the tungsten needle 862 and the molten metal is rapidly heated, causing... The pressure inside the furnace body 2 rises sharply, pushing the tungsten needle 862 away from the molten metal. When the standard target distance is reached, the limiting plate 863 is restricted by the arc-initiating rod 86, ensuring that the tungsten needle 862 and the molten metal are always kept within a safe and stable distance range. At the same time, as the electric arc is generated, the smoke will trigger the smoke alarm 91. The smoke alarm 91 will feed the signal back to the controller 873, which will start the motor 871. After the motor 871 is started, the gear 872 will rotate. Through the meshing of the gear 872 and the rack 88, the rotation of the gear 872 will cause the rack 88 to move upward, thereby driving the arc-initiating rod 86 to move, further assisting the arc-initiating rod 86 away from the furnace charge.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A rocker mechanism for an electric arc melting furnace, comprising a base (1) and a furnace body (2) disposed on the base (1), wherein the furnace body (2) is provided with an operating rod (3), a protective door (4), a viewing window (5), a vacuum tube (6), and a gas filling port (7), wherein the vacuum tube (6) and the gas filling port (7) are both connected to the interior of the furnace body (2), characterized in that: The upper end of the furnace body (2) is bolted to an end cap (9). A smoke sensor (91) is provided on the lower end face of the end cap (9). An arc-inducing rod (86) is vertically slidably connected to the middle of the end cap (9). An end seat (861) is threaded to the lower end of the arc-inducing rod (86). A tungsten needle (862) is movably inserted into the middle of the end seat (861). The tungsten needle (862) is connected to an electrical device through a wire. A limit plate (863) is provided on the upper end of the tungsten needle (862). A reset spring (864) is sleeved on the upper part of the tungsten needle (862). The reset spring (864) is located above the limit plate (863). A copper crucible (21) is provided at the lower end of the inner cavity of the furnace body (2). A feeding groove (22) is evenly distributed on the copper crucible (21). A lifting mechanism (8) is provided on the rear side of the furnace body (2). The lifting mechanism (8) includes a mounting base (81). The mounting base (81) is fixedly mounted on the base (1) by screws. A support plate (82) is provided at the upper end of the mounting base (81). A drive assembly (87) and a controller (873) are fixedly mounted on the upper and lower ends of the support plate (82), respectively. A rack rod (88) is provided on the side of the arc-inducing rod (86) facing the mounting base (81). A guide rod (83) is provided on the upper end of the rack rod (88). A scale bar (85) is provided on the outer side of the guide rod (83). An adjusting sleeve (84) is threaded onto the guide rod (83). The drive assembly (87) includes a motor (871) and a gear (872). The gear (872) is fixedly mounted on the output shaft of the motor (871). The gear (872) and the rack rod (88) are meshed together. The controller (873), the smoke sensor (91), and the motor (871) are electrically connected by wires.

2. The rocker mechanism on an electric arc melting furnace according to claim 1, characterized in that: The mounting base (81) has a through slot for the gear (872) to pass through, and the gear (872) passes through the through slot.

3. The rocker mechanism on an electric arc melting furnace according to claim 1, characterized in that: The center lines of the arc-initiating rod (86) and the guide rod (83) are parallel to each other, and both the arc-initiating rod (86) and the guide rod (83) are inserted into the mounting base (81).

4. The rocker mechanism on an electric arc melting furnace according to claim 1, characterized in that: The copper crucible (21) is located directly below the arc-starting rod (86), and the copper crucible (21) and the arc-starting rod (86) are collinear.

5. The rocker mechanism on an electric arc melting furnace according to claim 1, characterized in that: The arc-starting rod (86) has a slot below it for inserting the end seat (861).

6. The rocker mechanism on an electric arc melting furnace according to claim 1, characterized in that: The end seat (861) is provided with a sliding groove for sliding of the limiting plate (863).

7. The rocker mechanism on an electric arc melting furnace according to claim 1, characterized in that: The return spring (864) is located between the end seat (861) and the arc-starting rod (86).

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