RH furnace aluminum hopper air seal purging device

Abstract

The utility model discloses an RH furnace aluminum hopper air seal purging device, the RH furnace aluminum hopper air seal purging device comprises an aluminum hopper, a material guide pipe, a material conveying control valve and a purging mechanism, the material conveying control valve is arranged in the material guide pipe, the material guide pipe is connected to a discharge port of the aluminum hopper, the pipe wall of the material guide pipe is provided with a vent hole, and the purging mechanism is arranged in the material guide pipe. The blowing mechanism comprises an air storage tank, an air conveying pipe and an air inlet control valve, cold air is stored in the air storage tank, the air conveying pipe is connected into the ventilation hole and communicated with the inner space of the material guiding pipe, and the air inlet control valve is installed in the air conveying pipe and is in linkage with the material conveying control valve. According to the RH furnace aluminum hopper gas seal purging device, gas is blown into the aluminum hopper through the arranged purging mechanism to reduce the temperature in the material guide pipe and the aluminum hopper, so that aluminum particles in the aluminum hopper are prevented from caking, electronic elements in the aluminum hopper can be prevented from being burnt out by high temperature, the service life of a furnace is longer, and the service life of the furnace is prolonged. The discharging smoothness of the discharging port is improved, the overhauling frequency is low, potential safety hazards are reduced, and safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of steel smelting, in particular to a RH furnace aluminum bucket gas sealing and sweeping device. Background Art

[0002] RH furnace is a vacuum cycle degassing refining furnace, mainly used for metal smelting and refining. The working principle is to use the alloy elements added under vacuum to react with molten steel to achieve the purpose of changing the composition of molten steel and purifying molten steel. RH furnace is mainly composed of furnace body, gas circuit system, electrical control system and auxiliary facilities. In the production process, the metal raw materials are placed in the furnace body and the necessary auxiliary gas is added through the gas circuit system. After the furnace body is heated to the required temperature, it is melted and refined. The aluminum hopper is the inlet above the furnace body for adding alloys. When adding aluminum, the cone valve sealing hopper of the aluminum hopper opens, and a large amount of heat and smoke in the vacuum chamber are discharged from the cone valve sealing port through the aluminum hopper along the discharge pipe with the chimney effect.

[0003] In the related technology, due to the high temperature of the molten steel below the vacuum tank, the temperature in the aluminum bucket is maintained at 55-70°C for a long time. As the number of times and time the cone valve of the aluminum bucket is opened increases, the temperature rise in the aluminum bucket also increases, which can easily cause the aluminum particles to melt and agglomerate and get stuck at the hopper mouth, causing the material to be unable to be added. In addition, the weighing sensor and other electronic devices in the aluminum bucket are often damaged due to high temperature, which inevitably requires an increase in the frequency of maintenance. Since the density of nitrogen inside the aluminum bucket is greater than that of air, it will flow into the bottom of the receiving hopper and accumulate and cannot dissipate, forming an oxygen-deficient environment. When the personnel's awareness of safe operation is low, frequent maintenance will also increase the risk factor, reduce the efficiency of steel smelting production, and bring great safety hazards.

[0004] In view of this, it is necessary to propose a RH furnace aluminum bucket gas seal purge device to solve the above defects. Utility Model Content

[0005] The main purpose of the utility model is to provide a RH furnace aluminum bucket gas sealing and purging device, aiming to solve the problems of the existing aluminum bucket causing aluminum ions to melt due to high temperature, being stuck at the hopper mouth and being unable to add materials, and electronic devices being easily damaged due to high temperature.

[0006] To achieve the above-mentioned purpose, the utility model provides an RH furnace aluminum bucket gas seal purge device, comprising an aluminum bucket, a material guide pipe, a material delivery control valve and a purge mechanism, the material delivery control valve is arranged in the material guide pipe, the material guide pipe is connected to the discharge port of the aluminum bucket, and an air vent is opened on the tube wall of the material guide pipe. The purge mechanism comprises an air storage tank, an air delivery pipe and an air intake control valve. Cold air is stored in the air storage tank, the air delivery pipe is connected to the air vent and communicates with the internal space of the material guide pipe, and the air intake control valve is installed in the air delivery pipe and is linked to the material delivery control valve.

[0007] Preferably, the end of the air delivery pipe connected to the aluminum bucket includes a straight-through section, a diameter contraction section and a diameter expansion section connected in sequence, the diameter expansion section is connected to the material guide pipe, the diameter of the diameter contraction section is smaller than the diameter of the straight-through section, and the diameter of the diameter expansion section gradually expands from one end connected to the diameter contraction section to the other end.

[0008] Preferably, the diameter of the diameter-contracting section is less than or equal to two-thirds of the diameter of the straight-through section.

[0009] Preferably, the gas pipe is connected to the aluminum bucket via a connecting structure, the connecting structure includes a connecting plate, a center plate and a fastener, the gas pipe is connected and fixed to the connecting plate, the center plate is arranged between the connecting plate and the outer side wall of the aluminum bucket, and the fastener passes through the connecting plate and the center plate to fix both to the aluminum bucket.

[0010] Preferably, the cross-sections of the connecting plate and the middle connecting plate match the shape of the outer side wall of the aluminum bucket.

[0011] Preferably, the fastener is a bolt or a pin.

[0012] Preferably, the connecting plate and the middle connecting plate are both square steel plates with a thickness greater than 20 mm.

[0013] Preferably, the air intake control valve is a pneumatic ball valve.

[0014] Preferably, the material delivery control valve is a flip plate rotatably connected to the inside of the aluminum bucket, and the shape of the flip plate is compatible with the shape of the material guide tube.

[0015] Preferably, the air storage tank stores compressed cold air.

[0016] Compared with the prior art, the RH furnace aluminum bucket gas sealing and purging device provided by the utility model has the following beneficial effects:

[0017] The RH furnace aluminum bucket gas seal and purge device provided by the utility model blows gas into the aluminum bucket through the purge mechanism to reduce the temperature of the material guide pipe and the inside of the aluminum bucket, thereby preventing aluminum particles in the aluminum bucket from agglomerating and preventing high temperature from burning out electronic components inside the aluminum bucket. The furnace can be used for a longer time, the discharge smoothness of the discharge port is improved, the maintenance frequency is reduced, safety hazards are reduced, and safety is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0019] Figure 1 This is a schematic diagram of the structure of the RH furnace aluminum bucket gas sealing and purge device provided by the utility model;

[0020] Figure 2 for Figure 1 The structural schematic diagram of the RH furnace aluminum bucket gas seal and purge device shown;

[0021] Figure 3 for Figure 2 Schematic diagram of the connection structure shown.

[0022] The purpose, features and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0023] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0026] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0027] See also Figure 1 and Figure 2 The utility model provides an RH furnace aluminum bucket gas seal purge device. The RH furnace aluminum bucket gas seal purge device comprises an aluminum bucket 1, a material guide pipe 3, a material delivery control valve 5 and a purge mechanism 7. The material delivery control valve 5 is arranged in the material guide pipe 3, the material guide pipe 3 is connected to the discharge port of the aluminum bucket 1, and a vent hole 31 is opened on the tube wall of the material guide pipe 3. The purge mechanism 7 comprises an air storage tank 71, an air delivery pipe 73 and an air intake control valve 75. Cold air is stored in the air storage tank 71, the air delivery pipe 73 is connected to the air vent hole 31 and communicates with the internal space of the material guide pipe 3, and the air intake control valve 75 is installed in the air delivery pipe 73 and is linked to the material delivery control valve 5. The purge mechanism 7 is provided to blow gas into the aluminum bucket 1 to lower the temperature of the guide pipe 3 and the inside of the aluminum bucket 1, thereby preventing the aluminum particles in the aluminum bucket 1 from agglomerating and preventing the electronic components inside the aluminum bucket 1 from being burned out by high temperature. The furnace can be used for a longer time, the discharge smoothness of the discharge port is improved, the maintenance frequency is reduced, the safety hazards are reduced, and the safety is improved.

[0028] Specifically, in this embodiment, the end of the gas delivery pipe 73 connected to the aluminum bucket 1 includes a straight-through section 731, a diameter contraction section 733 and a diameter expansion section 735 connected in sequence. The diameter expansion section 735 is connected to the guide pipe 3. The diameter of the diameter contraction section 733 is smaller than the diameter of the straight-through section 731. The diameter expansion section 735 is trumpet-shaped. The diameter of the diameter expansion section 735 gradually expands from one end connected to the diameter contraction section 733 to the other end. After the gas comes out of the gas storage tank 71, it enters the aluminum bucket 1 through the gas delivery pipe 73. During the movement of the gas flow, the flow rate in the straight-through section 731 is normal. After being squeezed by the diameter contraction section 733, it is sprayed out by the diameter expansion section 735, thereby increasing the flow rate of the gas. It can be understood from the Bernoulli principle that the Bernoulli principle describes the relationship between the velocity and pressure of the fluid during the flow process. In the steady state of the fluid, when the fluid velocity increases, the pressure decreases; when the fluid velocity decreases, the pressure increases. Therefore, by connecting the air delivery pipe 73 to one end of the aluminum bucket 1 and setting it into a variable diameter structure, the air flow velocity ejected from the air delivery pipe 73 can be greatly increased, thereby improving the purging effect.

[0029] Furthermore, the diameter of the diameter-contracting section 733 is less than or equal to two-thirds of the diameter of the straight-through section 731 .

[0030] See also Figure 3 In another embodiment, the RH furnace aluminum bucket gas seal purging device further includes a connection structure 9, and the diameter expansion section 735 of the gas pipe 73 is connected to the aluminum bucket 1 through the connection structure 9. Specifically, the connection structure 9 includes a connection plate 91, a middle plate 93 and a fastener 95, the gas pipe 73 is connected and fixed to the connection plate 91, the middle plate 93 is arranged between the connection plate 91 and the outer side wall of the aluminum bucket 1, the fastener 95 passes through the connection plate 91 and the middle plate 93 to fix both to the aluminum bucket 1, and the gas pipe 73 is fixed to the aluminum bucket 1 through the connection structure 9 to improve the connection firmness.

[0031] Specifically, the cross-sections of the connecting plate 91 and the middle connecting plate 93 match the shape of the outer wall of the aluminum bucket 1. That is, the shape of the aluminum bucket 1 can be square or circular. When the outer wall of the aluminum bucket 1 is flat, the connecting plate 91 and the middle connecting plate 93 are flat plates. When the outer wall of the aluminum bucket 1 is circular, the connecting plate 91 and the middle connecting plate 93 are arc-shaped plates. Therefore, the connection with matching shapes makes the connection fit better.

[0032] Specifically, the fastener 95 is a bolt or a pin. Preferably, the fastener 95 is a bolt.

[0033] In detail, the connecting plate 91 and the middle connecting plate 93 are both square steel plates, and in order to ensure durability, the thickness thereof is greater than 20 mm, preferably 25 mm or 30 mm.

[0034] Specifically, the air intake control valve 75 is a pneumatic ball valve. An interlocking program between the vacuum main valve and the pneumatic ball valve is added to the PLC system of the RH furnace. When the vacuum main valve is fully closed, the pneumatic ball valve automatically opens to purge the material guide pipe to block the heat transfer of the vacuum chamber. After the vacuum main valve is fully opened, the pneumatic ball valve automatically closes and stops purging after a delay of 5 seconds, thereby ensuring the efficiency of vacuuming during RH furnace smelting.

[0035] Specifically, the feed control valve 5 is a flip plate rotatably connected to the inside of the aluminum bucket 1 through a hinge, and the flip plate 10 is used to isolate the connection between the guide pipe 3 and the vacuum tank 11. The shape of the flip plate is adapted to the internal shape of the guide pipe 3. The flip plate opens and closes the guide pipe 3 under rotation control. When it is opened, the alloy enters the ladle 12 from the guide pipe, and when it is closed, the aluminum bucket is isolated from the vacuum tank 11.

[0036] Furthermore, compressed cold air is stored in the gas storage tank 71. Specifically, the compressed air is nitrogen, and the gas storage tank is connected to a medium-pressure nitrogen pipeline in the system.

[0037] The RH furnace aluminum bucket gas seal and purging device provided by the utility model blows gas into the aluminum bucket 1 through the purging mechanism 7 to reduce the temperature of the guide pipe 3 and the inside of the aluminum bucket 1, thereby preventing the aluminum particles in the aluminum bucket 1 from agglomerating and preventing the electronic components inside the aluminum bucket 1 from being burned out by high temperature. The furnace can be used for a longer time, the discharge smoothness of the discharge port is improved, the maintenance frequency is reduced, the safety hazards are reduced, and the safety is improved.

[0038] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A RH furnace aluminum bucket gas sealing and purging device, characterized in that: It includes an aluminum bucket, a material guide pipe, a material delivery control valve and a purge mechanism, wherein the material delivery control valve is arranged in the material guide pipe, the material guide pipe is connected to the material discharge port of the aluminum bucket, an air vent is opened on the tube wall of the material guide pipe, and the purge mechanism includes an air storage tank, an air delivery pipe and an air intake control valve, the air storage tank stores cold air, the air delivery pipe is connected to the air vent and communicates with the internal space of the material guide pipe, and the air intake control valve is installed in the air delivery pipe and is linked to the material delivery control valve.

2. The RH furnace aluminum bucket gas seal and purge device according to claim 1 is characterized in that: The end of the air delivery pipe connected to the aluminum bucket includes a straight-through section, a diameter contraction section and a diameter expansion section connected in sequence, the diameter expansion section is connected to the material guide pipe, the diameter of the diameter contraction section is smaller than the diameter of the straight-through section, and the diameter of the diameter expansion section gradually expands from one end connected to the diameter contraction section to the other end.

3. The RH furnace aluminum bucket gas seal and purge device according to claim 2 is characterized in that: The diameter of the diameter-contracting section is less than or equal to two-thirds of the diameter of the straight-through section.

4. The RH furnace aluminum bucket gas seal and purge device according to claim 1, characterized in that: The gas pipe is connected to the aluminum bucket via a connecting structure, which includes a connecting plate, a center plate and fasteners. The gas pipe is connected and fixed to the connecting plate. The center plate is arranged between the connecting plate and the outer side wall of the aluminum bucket. The fasteners pass through the connecting plate and the center plate to fix both to the aluminum bucket.

5. The RH furnace aluminum bucket gas seal and purge device according to claim 4, characterized in that: The cross-sections of the connecting plate and the middle connecting plate match the shape of the outer side wall of the aluminum bucket.

6. The RH furnace aluminum bucket gas seal and purge device according to claim 4, characterized in that: The fastener is a bolt or a pin.

7. The RH furnace aluminum bucket gas seal and purge device according to claim 4, characterized in that: The connecting plate and the middle connecting plate are both square steel plates with a thickness greater than 20 mm.

8. The RH furnace aluminum bucket gas seal and purge device according to claim 1, characterized in that: The air intake control valve is a pneumatic ball valve.

9. The RH furnace aluminum bucket gas seal and purge device according to claim 1, characterized in that: The material delivery control valve is a flip plate rotatably connected to the inside of the aluminum bucket, and the shape of the flip plate is adapted to the shape of the material guide pipe.

10. The RH furnace aluminum bucket gas seal and purge device according to claim 1, characterized in that: Compressed cold air is stored in the air storage tank.

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