Production device for vacuum degassing rare earth steel

Abstract

The invention relates to the technical field of rare earth steel production, in particular to a vacuum degassing rare earth steel production device which comprises a heating smelting box, a cover plate and a stirring mechanism arranged in the heating smelting box, the cover plate is fixedly arranged at the top end of the heating smelting box, and the stirring mechanism is rotationally connected with the cover plate; the top end of the inner wall of the heating smelting box is fixedly provided with an air exhaust mechanism for unidirectionally absorbing air on the inner wall of the heating smelting box; a gas transmission mechanism for unidirectionally inputting inert gas towards the inner wall of the heating smelting box is arranged on the periphery of the heating smelting box close to the bottom end. Through the arrangement of the high-temperature-resistant rubber air bag, the limiting mechanism, the air guide mechanism and the sealing mechanism, molten steel and rare earth powder can be stirred in a rolling mode, the mixing degree of the molten steel and the rare earth powder is guaranteed, the collaboration of degassing and recycling can be achieved, removed air is recycled, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of rare earth steel production, and particularly to a production device for vacuum degassing rare earth steel. Background Art

[0002] In modern steel industry, rare earth steel has attracted much attention due to the excellent improvement effect of rare earth elements on the properties of steel. Rare earth elements can effectively refine grains, significantly improve the strength and toughness of steel, and enhance its key performance indicators such as corrosion resistance and oxidation resistance, which makes rare earth steel have broad application prospects in many fields such as construction, machinery manufacturing, automobile industry and aerospace.

[0003] However, the current production of rare earth steel faces many severe challenges, especially a series of problems to be solved urgently in the production device. In the vacuum degassing process, the existing production device has obvious deficiencies. On the one hand, the interaction between molten steel and rare earth elements in the vacuum environment is not sufficient, and the mixing effect is insufficient; on the other hand, synergy cannot be achieved during the vacuum degassing process, and the discharged gas cannot be utilized, and the synergy is poor. Therefore, a new production device for vacuum degassing rare earth steel is urgently needed to overcome these problems. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides the following technical solutions: A production device for vacuum degassing rare earth steel, comprising a heating and melting tank, a cover plate, and a stirring mechanism arranged in the heating and melting tank. The cover plate is fixedly arranged at the top end of the heating and melting tank, and the stirring mechanism is rotatably connected to the cover plate; a gas extraction mechanism for unidirectionally absorbing the air inside the inner wall of the heating and melting tank is fixedly arranged at the top end of the inner wall of the heating and melting tank; a gas transmission mechanism for unidirectionally inputting inert gas towards the inner wall of the heating and melting tank is arranged near the bottom end of the periphery of the heating and melting tank; a gas guiding mechanism for compressing the inert gas inside the gas transmission mechanism into the heating and melting tank as the air pressure in the gas extraction mechanism increases is arranged outside the heating and melting tank. The gas guiding mechanism is arranged equidistantly along the circumference of the periphery of the heating and melting tank. The top end of the gas guiding mechanism is communicated with the gas extraction mechanism, and the bottom end is communicated with the gas transmission mechanism. A sealing mechanism for blocking the communication between both ends of the gas guiding mechanism is slidably arranged up and down inside the gas guiding mechanism; a high-temperature resistant rubber airbag is arranged on the bottom surface of the cover plate corresponding to the gas extraction mechanism; a limiting mechanism for intermittently communicating the gas guiding mechanism with the gas extraction mechanism is rotatably arranged inside the gas extraction mechanism.

[0005] As an improvement of the above technical solution, a storage groove for installing the high-temperature resistant rubber airbag is opened on the bottom surface of the cover plate.

[0006] As an improvement to the above technical solution, the air extraction mechanism includes a gas storage box, a positioning ring, a rotating air extraction ring, and a one-way air extraction pipe. The gas storage box is fixedly connected to the inner wall top of the heating and melting box in a ring structure. A gas storage cavity communicating with the high-temperature resistant rubber air bag is provided on the top surface of the gas storage box. The rotating air extraction ring is rotatably arranged on the inner ring of the gas storage box. The one-way air extraction pipe is fixedly arranged on the rotating air extraction ring in an inclined manner. One end of the one-way air extraction pipe communicates with the heating and melting box, and the other end communicates with the gas storage cavity. The positioning ring is fixedly arranged on the bottom surface of the cover plate, and a ring groove for the one-way air extraction pipe to rotate is formed between the positioning ring and the gas storage box.

[0007] As an improvement to the above technical solution, the air guiding mechanism includes an air delivery pipe and a connecting air guiding pipe. The bottom end of the air delivery pipe communicates with the air delivery mechanism. The top end of the air delivery pipe is fixedly connected to the connecting air guiding pipe. The connecting air guiding pipe is in an L-shaped structure, and one end communicates with the gas storage cavity.

[0008] As an improvement to the above technical solution, the limiting mechanism includes a connecting rod, a retaining ring, and air vent holes. The retaining ring is rotatably attached to the inner wall of the gas storage cavity. The air vent holes are circumferentially and equidistantly arranged on the retaining ring. The air vent holes intermittently communicate with the connecting air guiding pipe. The connecting rod is fixedly connected between the retaining ring and the rotating air extraction ring. The connecting rod is rotatably arranged in the ring groove.

[0009] As an improvement to the above technical solution, the air delivery mechanism includes an air guiding disc and a one-way air guiding pipe. The air guiding disc is sleeved around the heating and melting box. The one-way air guiding pipe is fixedly connected between the air guiding disc and the heating and melting box. A one-way pilot solenoid valve is arranged on the inner wall of one end of the one-way air guiding pipe.

[0010] As an improvement to the above technical solution, the sealing mechanism includes a limiting rod and a sealing sliding plate. The sealing sliding plate is hermetically arranged in the inner wall of the air delivery pipe in a sliding manner up and down. The limiting rod is fixedly arranged between the top end and the bottom end of the inner wall of the air delivery pipe. The sealing sliding plate is slidably connected to the limiting rod.

[0011] As an improvement to the above technical solution, the stirring mechanism includes a rotating rod, a rotating motor, stirring rods, support rods, and scraping plates. The rotating motor is fixedly arranged on the top surface of the cover plate. The power output end of the rotating motor penetrates through the cover plate and is fixedly connected to the rotating rod. The stirring rods are fixedly connected to the periphery of the rotating rod. The support rods are fixedly connected to both sides of the bottom end of the rotating rod. One end of the support rod is fixedly connected to the scraping plate. The scraping plate is rotatably arranged at the bottom end of the inner wall of the heating and melting box.

[0012] As an improvement of the above technical solution, a power mechanism for driving the rotary air extraction ring to rotate is arranged between the rotary air extraction ring and the rotary rod. The power mechanism includes an electric telescopic rod, a first docking rod and a second docking rod. One end of the electric telescopic rod is rotatably connected to the rotary air extraction ring through a lifting lug, and the other end is rotatably connected to the second docking rod through a lifting lug. One end of the second docking rod is rotatably connected to the rotary air extraction ring through a lifting lug, and the other end is intermittently docked and connected to the first docking rod. The first docking rod is fixedly connected to the periphery of the rotary rod.

[0013] Advantages of the present invention: Through the settings of the high-temperature resistant rubber airbag, the limiting mechanism, the air guiding mechanism and the sealing mechanism, it is convenient to introduce the air in the heating and melting box into the high-temperature resistant rubber airbag, causing it to expand and bulge. The rotation of the limiting mechanism can intermittently connect the air guiding mechanism and the air extraction mechanism. When in the connected state, the air in the high-temperature resistant rubber airbag will quickly press the sealing mechanism, causing the sealing mechanism to compress the inert gas into the heating and melting box, and perform a tumbling stirring on the molten steel and rare earth powder, ensuring the mixing degree, and realizing the synergy of degassing and reuse, reusing the extracted air, and improving production efficiency. Description of the drawings

[0014] Figure 1 It is a schematic structural diagram of the present invention; Figure 2 It is a schematic structural diagram of the heating and melting box of the present invention; Figure 3 It is a schematic structural diagram of the stirring rod of the present invention; Figure 4 It is a schematic diagram of the positional relationship between the air storage box and the air guiding disc of the present invention; Figure 5 It is an enlarged view of the connection structure between the first docking pipe and the second docking rod of the present invention; Figure 6 It is an enlarged view of the connection structure between the rotary air extraction ring and the retaining ring of the present invention; Figure 7 It is an enlarged schematic structural diagram of the air storage box of the present invention; Figure 8 It is an enlarged schematic structural diagram of the cover plate of the present invention; Figure 9 It is an enlarged view of the connection structure between the cover plate and the high-temperature resistant rubber airbag of the present invention; Figure 10 It is an enlarged view of the internal structure of the air delivery pipe of the present invention; Figure 11 It is an enlarged schematic structural diagram of the air guiding disc of the present invention.

[0015] Reference numerals: 1, heating and melting tank; 11, discharge pipe; 12, air storage box; 121, air storage cavity; 13, positioning ring; 131, ring groove; 14, rotating air extraction ring; 141, one-way air extraction pipe; 142, connecting rod; 15, retaining ring; 151, ventilation hole; 16, cover plate; 161, storage tank; 162, high-temperature resistant rubber airbag; 2, air delivery pipe; 21, connecting air guide pipe; 22, air guide disc; 221, support leg; 222, one-way air guide pipe; 23, limiting rod; 24, sealing slide plate; 3, rotating rod; 31, rotating motor; 32, first docking rod; 33, stirring rod; 34, support rod; 341, scraping plate; 4, electric telescopic rod; 41, second docking rod. Detailed implementation mode

[0016] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below. 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.

[0017] Please refer to Figures 1 - 11 As shown in the figure, the present invention provides a production device for vacuum degassing rare earth steel, including a heating and melting tank 1, a cover plate 16 and a stirring mechanism arranged in the heating and melting tank 1. The cover plate 16 is fixedly arranged at the top end of the heating and melting tank 1, and the stirring mechanism is rotatably connected with the cover plate 16; At the top end of the inner wall of the heating and melting tank 1, an air extraction mechanism for unidirectionally absorbing the air on the inner wall of the heating and melting tank 1 is fixedly arranged; An air delivery mechanism for unidirectionally inputting inert gas towards the inner wall of the heating and melting tank 1 is arranged near the bottom end of the periphery of the heating and melting tank 1; An air guide mechanism is arranged on the periphery of the heating and melting tank 1. As the air pressure in the air extraction mechanism increases, the inert gas inside the air delivery mechanism is compressed and enters the heating and melting tank 1. The air guide mechanism is arranged at equal intervals along the circumference of the periphery of the heating and melting tank 1. The top end of the air guide mechanism is communicated with the air extraction mechanism, and the bottom end is communicated with the air delivery mechanism. A sealing mechanism for blocking the communication between the two ends of the air guide mechanism is arranged in the air guide mechanism in a sliding manner up and down; A high-temperature resistant rubber airbag 162 is arranged on the bottom surface of the cover plate 16 corresponding to the air extraction mechanism; A limiting mechanism for intermittently communicating the air guide mechanism and the air extraction mechanism is rotatably arranged in the air extraction mechanism.

[0018] In this case, the stirring mechanism is arranged inside the heating and melting tank 1. The heating and melting tank 1 is used to melt metal steel into a liquid state. After melting into a liquid state, it is stirred by the stirring mechanism to prevent solidification. There is a feeding port on the top of the cover plate 16 for feeding materials into the heating and melting tank 1. The feeding port is not shown in the drawings. After melting the metal steel, rare earth powder is added into the heating and melting tank 1 through the feeding port. After adding the rare earth powder, the feeding port is in a closed state to prevent external air from entering the heating and melting tank 1 during the mixing process. There is an air extraction pump inside the air extraction mechanism. The air extraction pump is used to pump the air inside the heating and melting tank 1 into the air extraction mechanism for storage, reducing the amount of air inside the heating and melting tank 1. The air extraction pump is not shown in the drawings. The air extraction principle of the air extraction pump belongs to the commonly used air extraction technical means in the prior art, so no further elaboration is made.

[0019] Among them, the air extraction pump inside the air extraction mechanism pumps air into the air extraction mechanism for storage. There is a high-temperature resistant rubber airbag 162 on the bottom surface of the cover plate 16 corresponding to the top surface of the air extraction mechanism. When the air accumulates in the air extraction mechanism, the high-temperature resistant rubber airbag 162 can bulge and expand, as Figure 9 shown, the state of the high-temperature resistant rubber airbag 162 can be seen. Its bottom is in an open state. After the air converges into the air extraction mechanism, it will enter the inside of the high-temperature resistant rubber airbag 162, causing the high-temperature resistant rubber airbag 162 to bulge and expand, so as to store more air.

[0020] Supplementary note: The high-temperature resistant rubber airbag 162 has the characteristic of high temperature resistance and will not melt or rupture due to excessive temperature in a high-temperature environment, ensuring its use ductility. Ductility means that when the air inside the air extraction mechanism is released, the high-temperature resistant rubber airbag 162 can quickly contract and discharge the air outside the air extraction mechanism.

[0021] Among them, a sealing mechanism for blocking the connection between the two ends of the air guiding mechanism is arranged in the air guiding mechanism in a vertically sliding manner. And a limiting mechanism for intermittently connecting the air guiding mechanism and the air extraction mechanism is rotatably arranged in the air extraction mechanism. By rotating the limiting mechanism, the air extraction mechanism and the air guiding mechanism can be intermittently connected. Therefore, after the air extraction mechanism and the air guiding mechanism are connected by rotating the limiting mechanism, under the extrusion action of the high-temperature resistant rubber airbag 162 on the air, the air inside the air extraction mechanism can quickly enter the air guiding mechanism. After entering the air guiding mechanism, it presses the sealing mechanism, causing the sealing mechanism to slide and compress the inert gas inside the gas transmission mechanism, so that the inert gas inside the gas transmission mechanism quickly enters the heating and melting tank 1. The inert gas is used to impact the molten steel and rare earth powder inside the heating and melting tank 1, causing the molten steel and rare earth powder to mix in a tumbling state, ensuring the full mixing of the molten steel and rare earth powder.

[0022] Among them, a sealing mechanism is arranged in a sliding manner up and down in the air guiding mechanism, and the bottom end of the air guiding mechanism is communicated with the air conveying mechanism. By connecting the air conveying mechanism to an inert gas input device externally, it is convenient to fill the inert gas into the air conveying mechanism and the air guiding mechanism. Among them, the externally connected inert gas input device is not shown in the attached drawings, and it belongs to the equipment in the prior art. It can be achieved by connecting an external inert gas input box, and it is only necessary to enable the inert gas to enter the air conveying mechanism. Here, the inert gas input device will not be elaborated too much. When the air pressure in the air extraction mechanism is too high, through the control of the limiting mechanism, the air is input into the air guiding mechanism, and the air pressure presses the sealing mechanism, causing the sealing mechanism to slide. Thus, the inert gas in the air guiding mechanism is compressed by the sealing mechanism, enabling the inert gas to quickly flow into the heating and melting furnace 1, and performing a tumbling stirring on the molten steel to ensure its full mixing.

[0023] Through the settings of the high-temperature resistant rubber airbag 162, the limiting mechanism, the air guiding mechanism, and the sealing mechanism, it is convenient to introduce the air in the heating and melting furnace 1 into the high-temperature resistant rubber airbag 162, causing it to expand and bulge. With the rotation of the limiting mechanism, the air guiding mechanism can be intermittently communicated with the air extraction mechanism. When in the communication state, the air in the high-temperature resistant rubber airbag 162 will quickly press the sealing mechanism, causing the sealing mechanism to compress the inert gas and enter the heating and melting furnace 1, performing a tumbling stirring on the molten steel and rare earth powder to ensure the mixing degree, and being able to achieve the synergy of degassing and reuse, reusing the extracted air, and improving production efficiency.

[0024] Among them, there are the following defects in using the stirring mechanism to stir the molten steel: When the stirring mechanism rotates in the molten steel, mainly a strong stirring area is formed around the stirring mechanism, while the flow of the molten steel and rare earth powder is relatively weak in the area far from the stirring mechanism, which easily leads to uneven mixing. Especially for large steelmaking melting furnaces, this non-uniformity will be more obvious, possibly causing uneven distribution of rare earth elements in the molten steel, affecting the performance consistency of the steel, and thus resulting in uneven dispersion of rare earth powder in the molten steel and easy agglomeration, affecting the quality of the rare earth steel after forming. Therefore, the jetting method is adopted to make the molten steel in a tumbling state of flow, which is convenient for the full mixing of the molten steel and rare earth powder, enabling the rare earth elements in the rare earth powder to be fully and evenly mixed in the molten steel to prevent affecting the quality of the rare earth steel after forming. Among them, the air guiding mechanism is arranged peripherally around the heating and melting furnace 1 at equal circumferential intervals. Therefore, inert gas can be ejected into the heating and melting furnace 1 from multiple directions of the heating and melting furnace 1 to ensure the tumbling state of the molten steel.

[0025] As Figure 8 and Figure 9 shown, a storage groove 161 for installing the high-temperature resistant rubber airbag 162 is opened on the bottom surface of the cover plate 16.

[0026] By providing the storage tank 161, it is convenient to accommodate the high-temperature resistant rubber airbag 162 and can provide an expansion space for the high-temperature resistant rubber airbag 162.

[0027] As Figure 4 、 Figure 6 and Figure 7 shown, the air extraction mechanism includes a gas storage box 12, a positioning ring 13, a rotating air extraction ring 14 and a one-way air extraction pipe 141. The gas storage box 12 is fixedly connected to the inner wall top of the heating and melting box 1 in a ring structure. A gas storage cavity 121 communicating with the high-temperature resistant rubber airbag 162 is provided on the top surface of the gas storage box 12. The rotating air extraction ring 14 is rotatably arranged on the inner ring of the gas storage box 12. The one-way air extraction pipe 141 is fixedly arranged on the rotating air extraction ring 14 in an inclined manner. One end of the one-way air extraction pipe 141 communicates with the heating and melting box 1, and the other end communicates with the gas storage cavity 121. The positioning ring 13 is fixedly arranged on the bottom surface of the cover plate 16, and a ring groove 131 for the one-way air extraction pipe 141 to rotate is formed between the positioning ring 13 and the gas storage box 12.

[0028] By providing the gas storage box 12, it is convenient to collect and store the absorbed air. Among them, an air extraction pump is arranged in the gas storage box 12. By starting the air extraction pump, it is convenient to extract the air inside the heating and melting box 1 into the gas storage box 1 through the one-way air extraction pipe 141, realizing the vacuum inside the heating and melting box 1, performing vacuum degassing to increase the quality of the formed rare earth steel, preventing impurities in the air from being doped in the rare earth steel, and improving the overall quality.

[0029] Among them, during the air extraction process, when the air extraction pump is started, suction is generated in the one-way air extraction pipe 141, and the air inside the heating and melting box 1 is extracted into the gas storage box 1. At this time, the top of the gas storage box 1 is communicated with the high-temperature resistant rubber airbag 162, and the air drawn into the gas storage box 1 will enter the high-temperature resistant rubber airbag 162 to make it expand. After the air extraction is completed, through the rotation of the limiting mechanism, it is convenient to release the air towards the air guiding mechanism. Under the action of the sealing mechanism, it can impact the sealing mechanism, so that the inert gas is compressed during the sliding process, and the inert gas enters the heating and melting box 1, performing a tumbling impact on the molten steel, making it fully mixed with the rare earth powder and improving the mixing efficiency.

[0030] Among them, the one-way air extraction pipe 141 is arranged in an inclined state to ensure the smoothness of air extraction. The one-way air extraction pipe 141 is inclined downward for air extraction, which can improve the air extraction speed, avoid ineffective extraction of the gas below during horizontal setting during air extraction, and improve the air extraction efficiency.

[0031] As Figure 4 、 Figure 7 and Figure 10As shown in the figure, the air guiding mechanism includes an air delivery pipe 2 and a connecting air duct 21. The bottom end of the air delivery pipe 2 is communicated with the air delivery mechanism, and the top end of the air delivery pipe 2 is fixedly communicated with the connecting air duct 21. The connecting air duct 21 has an L-shaped structure, and one end thereof is communicated with the air storage cavity 121.

[0032] Among them, Figure 7 The holes shown on the periphery of the air storage box 12 are the holes formed by the connection between the connecting air duct 21 and the air storage cavity 121. One end of the air duct 21 penetrates through the outer side of the air storage box 12 and is communicated with the air storage cavity 121. Therefore, Figure 7 the reference numerals of the holes opened on the periphery of the air storage box 12 are not marked in the figure.

[0033] Among them, the connecting air duct 21 fixed to the top end of the air delivery pipe 2 is communicated with the air storage cavity 121, so that the air in the air storage cavity 121 can enter the air delivery pipe 2. A sealing mechanism is arranged in the air delivery pipe 2, which can make the air enter the pressure space surrounded by the sealing mechanism and the air delivery pipe 2. The bottom end of the air delivery pipe 2 is communicated with the air delivery mechanism. When the air enters the pressure space, the sealing mechanism can compress the inert gas downward, so that the inert gas rushes into the heating and melting furnace 1.

[0034] Supplementary description of the air delivery pipe 2: A sealing mechanism that slides up and down is arranged inside the air delivery pipe 2. Through the sealing mechanism, the air delivery pipe 2 can be divided into two parts, namely: the upper half of the air delivery pipe 2 and the pressure space surrounded by the sealing mechanism, and the lower half of the air delivery pipe 2 and the air storage space surrounded by the sealing mechanism. When the air pressure in the pressure space increases, the sealing mechanism can move downward, thereby compressing the area of the air storage space and pressing the inert gas. The inert gas is stored in the air storage space. Therefore, by moving the sealing mechanism, the inert gas can enter the heating and melting furnace 1.

[0035] Supplementary description: An air extractor is arranged on the top surface of the air delivery pipe 2. Through the air extractor, it is convenient to extract the air entering the air delivery pipe 2. Among them, the air extractor is not drawn in the attached drawing and is a commonly used air extraction device in the prior art, so no more details will be described. During the process of extracting air by the air extractor before discharging the molten steel, the limiting mechanism is always in a state of blocking the communication between the air delivery pipe 2 and the air storage cavity 121, so as to avoid the unidirectional air duct 141 extracting the inert gas inside the heating and melting furnace 1 during the process of extracting air. After discharging the molten steel, by rotating the limiting mechanism, the air delivery pipe 2 and the air storage cavity 121 can be in a communicating state. At this time, it is convenient to extract the air inside the air delivery pipe 2 and the air storage cavity 121 to the outside. If purification is required, it can be purified during the process of extracting air, and the purified air is discharged to the external environment.

[0036] Supplement: Since there may be a situation where the air inside the heating and melting tank 1 cannot be completely extracted at one time during the extraction process, releasing inert gas into the heating and melting tank 1 after extraction can reduce the overall content of the air inside the heating and melting tank 1, and when the inert gas is introduced into the heating and melting tank 1, the molten steel is in a tumbling state, which facilitates the upward flow of the air mixed in the molten steel. The sealing of the inert gas used in the present invention is greater than that of air. For example, argon. Due to the fact that the density of the inert gas seal is greater than that of air, it will push the air upward to form a separation. Among them, after the air in the molten steel is released, it is convenient for the air to float upward. Therefore, during the process of repeatedly extracting the air inside the heating and melting tank 1, the inert gas will be used multiple times to perform a tumbling stirring on the molten steel, so that the air wrapped in the molten steel is released, in order to achieve the process of vacuum degassing. And because the density of the inert gas is greater than that of air, the air will be located above, and during the process of repeatedly extracting the air inside the heating and melting tank 1, excessive inert gas can be avoided from being extracted.

[0037] As Figure 6 and Figure 7 shown, the limiting mechanism includes a connecting rod 142, a retaining ring 15, and ventilation holes 151. The retaining ring 15 is rotatably and fittingly arranged on the inner wall of the gas storage cavity 121. The ventilation holes 151 are circumferentially and equidistantly arranged on the retaining ring 15. The ventilation holes 151 are intermittently communicated with the connecting air duct 21. The connecting rod 142 is fixedly connected between the retaining ring 15 and the rotary air extraction ring 14. The connecting rod 142 is rotatably arranged in the annular groove 131.

[0038] By rotatably and fittingly arranging the retaining ring 15 on the inner wall of the gas storage cavity 121, as Figure 4 、 Figure 6 and Figure 7 shown, the states of the retaining ring 15 and the rotary air extraction ring 14 can be seen. The retaining ring 15 is rotatably arranged on the inner wall of the gas storage cavity 121 and is fittingly arranged with the gas storage box 12. In this way, the connecting air duct 21 communicated with the gas storage cavity 121 can be sealed by the retaining ring 15 to prevent air from flowing into the connecting air duct 21. By opening the ventilation holes 151 on the retaining ring 15, as the retaining ring 15 rotates, the ventilation holes 151 can be communicated with the connecting air duct 21. At this time, the air in the gas storage cavity 121 can enter the pressure space in the air duct 2 through the connecting air duct 21.

[0039] Through the limitation of the annular groove 131, which is formed between the positioning ring 13 and the gas storage box 12, as Figure 7 shown, the position of the annular groove 131 can be seen, and it can limit the connecting rod 142 and the one-way air extraction pipe 141.

[0040] As Figure 1 、 Figure 4 and Figure 11As shown, the gas transmission mechanism includes a gas guide disc 22 and a one-way gas guide pipe 222. The gas guide disc 22 is sleeved around the heating and melting box 1, and the one-way gas guide pipe 222 is fixedly connected between the gas guide disc 22 and the heating and melting box 1. A one-way pilot solenoid valve is provided on the inner wall of one end of the one-way gas guide pipe 222.

[0041] Among them, the one-way pilot solenoid valve is not shown in the drawings, and its working principle belongs to the prior art. The principle is: "When the air pressure increases, the electromagnetic coil of the pilot solenoid valve is energized, and the electromagnetic force will open the pilot hole. At this time, the upper cavity of the solenoid valve communicates with the outside through the pilot hole, and the air pressure drops rapidly. Due to the limitation of one-way conduction, the air pressure in the lower cavity of the main spool still remains at a relatively high pressure, thus forming a pressure difference with a lower upper part and a higher lower part between the upper and lower cavities of the main spool. The high air pressure in the lower cavity of the main spool will push the main spool upward, thereby opening the main valve port, enabling the gas to flow from the inlet to the outlet and realizing one-way conduction". Through the one-way gas guiding function of the one-way pilot solenoid valve, when the gas storage space in the gas transmission pipe 2 is compressed, the inert gas can converge towards the inside of the gas guide disc 22 and then enter the one-way gas guide pipe 222, increasing the air pressure inside it. When the air pressure in the one-way gas guide pipe 222 is relatively high, the one-way pilot solenoid valve will open, enabling the inert gas to quickly spray out from one end of the one-way gas guide pipe 222 into the heating and melting box 1. The spraying process belongs to jetting, which can make the molten steel inside the heating and melting box 1 in a tumbling state, enabling the molten steel to be fully mixed with the rare earth powder, ensuring the mixing degree, and due to the one-way setting of the one-way pilot solenoid valve, it can prevent the molten steel from entering the one-way gas guide pipe 222 from the heating and melting box 1.

[0042] Among them, as Figure 1 shown, a plurality of support legs 221 are fixedly arranged on the bottom surface of the gas guide disc 22, and the support legs 221 are arranged equidistantly along the circumference of the gas guide disc 22.

[0043] As Figure 10 shown, the sealing mechanism includes a limit rod 23 and a sealing slide plate 24. The sealing slide plate 24 is hermetically arranged on the inner wall of the gas transmission pipe 2 in a vertically sliding manner. The limit rod 23 is fixedly arranged between the top and bottom ends of the inner wall of the gas transmission pipe 2, and the sealing slide plate 24 is slidably connected to the limit rod 23.

[0044] Through the setting of the limit rod 23, the sealing slide plate 24 can be limited, preventing the sealing slide plate 24 from tilting during the up and down sliding process, thereby avoiding air leakage and preventing the air in the pressure space from entering the inert gas in the gas storage space. And through the setting of the sealing slide plate 24, the gas transmission pipe 2 is divided into a pressure space above the sealing slide plate 24 and a gas storage space below the sealing slide plate 24.

[0045] As Figure 1 and Figure 3As shown in the figure, the stirring mechanism includes a rotating rod 3, a rotating motor 31, stirring rods 33, support rods 34, and a scraper 341. The rotating motor 31 is fixedly arranged on the top surface of the cover plate 16. The power output end of the rotating motor 31 penetrates through the cover plate 16 and is fixedly connected to the rotating rod 3. The stirring rods 33 are fixedly connected to the periphery of the rotating rod 3. The support rods 34 are fixedly connected to both sides of the bottom end of the rotating rod 3. One end of the support rod 34 is fixedly connected to the scraper 341. The scraper 341 is rotatably arranged at the bottom end of the inner wall of the heating and melting tank 1.

[0046] By starting the rotating motor 31, the rotating rod 3 can be driven to rotate. The rotating rod 3 drives the stirring rods 33 to rotate, and the rotating rod 3 also drives the support rods 34 to rotate. The support rods 34 drive the scraper 341 to rotate. The molten steel can be stirred by the stirring rods 33, and the molten steel at the bottom end of the inner wall of the heating and melting tank 1 can be scraped by the rotation of the scraper 341, preventing the bottom of the molten steel from solidifying. Among them, Figure 1 it can be seen that a discharge pipe 11 is fixedly arranged at the bottom of the heating and melting tank 1, and a control solenoid valve is arranged inside the discharge pipe 11. When it is necessary to discharge the molten steel, the molten steel can be discharged by opening the control solenoid valve. At the same time, the bottom of the heating and melting tank 1 is arranged in a semi-circular structure to facilitate complete discharge of the molten steel. And through the scraping of the scraper 341, it is ensured that the discharge is complete.

[0047] As Figure 3 、 Figure 4 and Figure 5 shown, a power mechanism for driving the rotation of the rotary air extraction ring 14 is arranged between the rotary air extraction ring 14 and the rotating rod 3. The power mechanism includes an electric telescopic rod 4, a first docking rod 32, and a second docking rod 41. One end of the electric telescopic rod 4 is rotatably connected to the rotary air extraction ring 14 through a lug, and the other end is rotatably connected to the second docking rod 41 through a lug. One end of the second docking rod 41 is rotatably connected to the rotary air extraction ring 14 through a lug, and the other end is intermittently docked and connected to the first docking rod 32. The first docking rod 32 is fixedly connected to the periphery of the rotating rod 3.

[0048] By means of the rotation setting of the second docking rod 41, starting the electric telescopic rod 4 can drive the second docking rod 41 to move, so that the second docking rod 41 can be docked with the first docking rod 32. At this time, the rotating rod 3 is in a rotating state and can drive the first docking rod 32 to rotate. When the first docking rod 32 rotates to the position of the second docking rod 41, it can be docked with the second docking rod 41. At this time, it can drive the second docking rod 41 to rotate around the rotating rod 3, thereby driving the rotating air extraction ring 14 to rotate through the second docking rod 41. The rotating air extraction ring 14 drives the retaining ring 15 to rotate through the connecting rod 142, so that the air permeation holes 151 formed on the retaining ring 15 are communicated with the connecting air duct 21. At this time, the electric telescopic rod 4 is started to pull back again, so that the first docking rod 32 is separated from the second docking rod 41 in the docking state, so that the air in the air storage cavity 121 can enter the connecting air duct 21. Repeating the above operations can achieve the sealing of the connecting air duct 21 by the retaining ring 15.

[0049] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them.

Claims

1. A production device for vacuum degassing rare earth steel, comprising a heating and melting box (1), a cover plate (16), and a stirring mechanism arranged in the heating and melting box (1). The cover plate (16) is fixedly arranged at the top end of the heating and melting box (1), and the stirring mechanism is rotationally connected to the cover plate (16). It is characterized in that: A gas extraction mechanism for unidirectionally absorbing the air inside the inner wall of the heating and melting box (1) is fixedly arranged at the top end of the inner wall of the heating and melting box (1); An air supply mechanism for unidirectionally inputting inert gas towards the inner wall of the heating and melting box (1) is arranged near the bottom end of the periphery of the heating and melting box (1); A gas guiding mechanism for compressing the inert gas inside the air supply mechanism into the heating and melting box (1) as the air pressure in the gas extraction mechanism increases is arranged on the periphery of the heating and melting box (1). The gas guiding mechanisms are arranged equidistantly along the circumferential direction of the periphery of the heating and melting box (1). The top end of the gas guiding mechanism is communicated with the gas extraction mechanism, and the bottom end is communicated with the air supply mechanism. A sealing mechanism for blocking the communication between the two ends of the gas guiding mechanism is arranged in the gas guiding mechanism in a vertically sliding manner; A high-temperature resistant rubber airbag (162) is arranged on the bottom surface of the cover plate (16) corresponding to the gas extraction mechanism; A limiting mechanism for intermittently communicating the gas guiding mechanism with the gas extraction mechanism is rotationally arranged in the gas extraction mechanism.

2. The production device of a vacuum degassing rare earth steel according to claim 1, characterized in that: A storage groove (161) for installing the high-temperature resistant rubber airbag (162) is formed on the bottom surface of the cover plate (16).

3. The production device of a vacuum degassing rare earth steel according to claim 2, characterized in that: The gas extraction mechanism includes a gas storage box (12), a positioning ring (13), a rotating gas extraction ring (14), and a one-way gas extraction pipe (141). The gas storage box (12) is fixedly connected to the top end of the inner wall of the heating and melting box (1) in a ring structure. A gas storage cavity (121) communicated with the high-temperature resistant rubber airbag (162) is formed on the top surface of the gas storage box (12). The rotating gas extraction ring (14) is rotationally arranged on the inner ring of the gas storage box (12). The one-way gas extraction pipe (141) is fixedly arranged on the rotating gas extraction ring (14) in an inclined manner. One end of the one-way gas extraction pipe (141) is communicated with the heating and melting box (1), and the other end is communicated with the gas storage cavity (121). The positioning ring (13) is fixedly arranged on the bottom surface of the cover plate (16), and a ring groove (131) for the one-way gas extraction pipe (141) to rotate is formed between the positioning ring (13) and the gas storage box (12).

4. The production device of a vacuum degassing rare earth steel according to claim 3, characterized in that: The gas guiding mechanism includes an air supply pipe (2) and a connecting gas pipe (21). The bottom end of the air supply pipe (2) is communicated with the air supply mechanism, and the top end of the air supply pipe (2) is fixedly communicated with the connecting gas pipe (21). The connecting gas pipe (21) is in an L-shaped structure, and one end is communicated with the gas storage cavity (121).

5. The production device of a vacuum degassing rare earth steel according to claim 4, characterized in that: The limiting mechanism includes a connecting rod (142), a retaining ring (15), and air vent holes (151). The retaining ring (15) is rotationally attached to the inner wall of the gas storage cavity (121). The air vent holes (151) are formed on the retaining ring (15) at equal intervals in the circumferential direction. The air vent holes (151) are intermittently communicated with the connecting gas pipe (21). The connecting rod (142) is fixedly connected between the retaining ring (15) and the rotating gas extraction ring (14), and the connecting rod (142) is rotationally arranged in the ring groove (131).

6. The production device of a vacuum degassing rare earth steel according to claim 4, characterized in that: The gas transmission mechanism includes a gas guide disc (22) and a one-way gas guide pipe (222). The gas guide disc (22) is sleeved around the heating and melting tank (1), and the one-way gas guide pipe (222) is fixedly connected between the gas guide disc (22) and the heating and melting tank (1). A one-way pilot solenoid valve is provided on the inner wall of one end of the one-way gas guide pipe (222).

7. The production device of a vacuum degassed rare earth steel according to claim 4, characterized in that: The sealing mechanism includes a limit rod (23) and a sealing slide plate (24). The sealing slide plate (24) is slidably and sealingly arranged on the inner wall of the gas transmission pipe (2). The limit rod (23) is fixedly arranged between the top end and the bottom end of the inner wall of the gas transmission pipe (2), and the sealing slide plate (24) is slidably connected with the limit rod (23).

8. The production device of a vacuum degassing rare earth steel according to claim 3, characterized in that: The stirring mechanism includes a rotating rod (3), a rotating motor (31), a stirring rod (33), a support rod (34) and a scraper (341). The rotating motor (31) is fixedly arranged on the top surface of the cover plate (16). The power output end of the rotating motor (31) penetrates through the cover plate (16) and is fixedly connected with the rotating rod (3). The stirring rod (33) is fixedly connected to the periphery of the rotating rod (3). The support rod (34) is fixedly connected to both sides of the bottom end of the rotating rod (3). One end of the support rod (34) is fixedly connected with the scraper (341), and the scraper (341) is rotatably arranged at the bottom end of the inner wall of the heating and melting tank (1).

9. The production device of a vacuum degassing rare earth steel according to claim 8, characterized in that: A power mechanism for driving the rotation of the rotary air extraction ring (14) is arranged between the rotary air extraction ring (14) and the rotating rod (3). The power mechanism includes an electric telescopic rod (4), a first docking rod (32) and a second docking rod (41). One end of the electric telescopic rod (4) is rotatably connected with the rotary air extraction ring (14) through a lifting lug, and the other end is rotatably connected with the second docking rod (41) through a lifting lug. One end of the second docking rod (41) is rotatably connected with the rotary air extraction ring (14) through a lifting lug, and the other end is intermittently docked and connected with the first docking rod (32). The first docking rod (32) is fixedly connected to the periphery of the rotating rod (3).

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