A protective gas shield for a vertical ingot

Abstract

The utility model relates to copper and copper alloy vertical continuous or semi -continuous ingot casting technical field, concretely relates to a kind of protective gas cover for vertical ingot casting, including the first cylinder body placed above crystallizer, second cylinder body is equipped in the first cylinder body, the first cylinder body is fixed with the cover plate with round hole being opened in middle portion above second cylinder body, lower plate body is fixed between the lower end of second cylinder body and the inner wall of first cylinder body, and lower plate body is higher than the upper side of crystallizer;Multiple gas distribution holes are arranged on the second cylinder body, the first cylinder body is provided with gas inlet and observation port, the second cylinder body is provided with the gas passage corresponding with observation port, and two sealing plates are fixed between the first cylinder body and the second cylinder body and located on the both sides of gas passage.The utility model is equipped with second cylinder body with multiple gas distribution holes in the first cylinder body, and protective gas is evenly diffused and covers the top of melt in gas cover, effectively prevent oxidation by contacting with air.

Description

Technical Field

[0001] This utility model relates to the field of vertical continuous or semi-continuous ingot casting technology for copper and copper alloys, and specifically to a protective gas cover for vertical ingot casting. Background Technology

[0002] For vertical continuous or semi-continuous casting of copper and copper alloy ingots, the melt protection methods during the molten transfer process include three categories: gas, solid, and liquid protection. Solid and liquid protection methods generally have environmental pollution or health risks. Gas protection methods typically use coal gas or nitrogen, which are environmentally friendly and harmless to humans, but have slightly higher production costs. Gas protection methods require protective gas shields. Currently, the protective gas shields used in the industry are crudely designed, employing a simple top-opening structure. This results in the protective gas not being able to diffuse evenly within the shield, usually requiring a higher gas flow rate to fully fill the shield and prevent oxidation of the molten metal surface. Summary of the Invention

[0003] This invention addresses the problem that in existing vertical continuous or semi-continuous casting of copper and copper alloys, the protective gas hood used during the melt transfer process employs a simple side-opening structure, which results in uneven diffusion of the protective gas within the hood, leading to the waste of a large amount of protective gas to prevent oxidation of the liquid metal surface. The invention provides a protective gas hood for vertical ingot casting, in which the protective gas evenly diffuses within the hood, covering the melt, effectively reducing the amount of protective gas used and preventing oxidation of the melt upon contact with air.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows: A protective gas hood for vertical ingot casting is installed at the upper inlet of a crystallizer. It includes a first cylinder positioned above the crystallizer, with a second cylinder inside the first cylinder. A cover plate is fixedly installed on both the first and second cylinders, flush with each other. A circular hole is formed in the center of the cover plate. An annular lower plate is fixedly installed at the lower end of the second cylinder. The outer side of the lower plate is fixedly connected to the inner wall of the first cylinder, and the inner side is fixedly connected to the lower end of the second cylinder. The lower sides of both the second cylinder and the lower plate are higher than the upper side of the crystallizer. Multiple gas distribution holes are arranged on the second cylinder. An air inlet and an observation port are respectively opened on opposite sides of the first cylinder. An air outlet corresponding radially to the observation port is opened on one side of the second cylinder. Two sealing plates are fixedly installed between the first and second cylinders, respectively fixed on both sides of the air outlet or the observation port. An air inlet is connected to an air inlet pipe, and an observation cylinder is fixedly installed at the observation port. Protective gas enters the area between the first and second cylinders through the air inlet pipe and evenly enters the inner side of the second cylinder through the multiple gas distribution holes, providing gas protection for the area above the crystallizer.

[0005] Preferably, the observation tube is trumpet-shaped, with the smaller opening connected to the observation port and the larger opening tilted upwards, allowing observation of liquid level changes within the crystallizer.

[0006] Preferably, a first baffle and a second baffle are slidably disposed above the cover plate. The first baffle and the second baffle are provided with grooves on opposite sides. The grooves are located above the circular hole. By sliding the first baffle and the second baffle to move them closer to or away from the injection pipe for melt transfer, the area of ​​the circular hole is blocked, reducing the loss of protective gas.

[0007] Preferably, a first limiting member, a second limiting member, and two third limiting members are fixedly disposed above the cover plate. The first limiting member and the second limiting member are respectively located on the side of the first baffle and the second baffle that are far apart from each other. The third limiting members are respectively located on opposite sides of the groove and on opposite sides of the first baffle, respectively. The first limiting member and the third limiting member each include a limiting rod and a limiting plate. The limiting rod passes through the corresponding limiting plate and one end of it is fixedly connected to the first baffle. The second limiting member includes a limiting rod and at least two limiting plates. The limiting rod passes through the two limiting plates and one end of it is fixedly connected to the second baffle. The first limiting member, the second limiting member, and the two third limiting members slide and limit the first baffle and the second baffle.

[0008] Preferably, a stop bar is provided on one side of the second baffle. One end of the stop bar is fixedly connected to the second baffle, and the other end corresponds to the limiting plate of one of the third limiting members along the sliding direction of the second baffle. The stop bar limits the sliding stroke of the second baffle.

[0009] The beneficial effects of this utility model through the above technical solution are as follows: 1. This utility model provides a second cylinder inside the first cylinder, with air distribution holes evenly distributed on the side wall of the second cylinder. After the protective gas enters the inside of the first cylinder, it diffuses between the first and second cylinders and then evenly enters the inside and below of the second cylinder through multiple air distribution holes. This ensures uniform coverage above the crystallizer inlet and forms positive pressure, effectively isolating air and preventing the liquid metal from contacting air and causing oxidation.

[0010] 2. Currently, during melt transfer, the injection tube is usually tilted into the protective gas hood and then adjusted to be vertical. Therefore, the size of the circular hole is usually larger than the size of the injection tube. In order to reduce the overall gas output and save protective gas, this utility model slides the first baffle and the second baffle so that they are close to each other and reach the limit. The two grooves close to form a circular hole and are close to the injection tube. Then, the first baffle and the second baffle block the circular hole area outside the injection tube, reducing the emission of protective gas inside the device, reducing gas consumption per unit time, and reducing costs. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 .

[0012] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 .

[0013] Figure 3 This is a schematic diagram of the structure of the present invention. Figure 3 .

[0014] Figure 4 This is a schematic diagram of the structure of the first baffle and the second baffle of this utility model when they are far apart from each other.

[0015] Figure 5 This is a schematic diagram of the structure of the first baffle and the second baffle of this utility model when they are close to each other.

[0016] Figure 6 This is a schematic diagram of the structure of the present invention when it is installed above the crystallizer.

[0017] The numbers in the attached diagram are as follows: 1 is the first cylinder, 2 is the second cylinder, 3 is the cover plate, 4 is the round hole, 5 is the lower plate, 6 is the air distribution hole, 7 is the air inlet, 8 is the observation port, 9 is the air outlet, 10 is the sealing plate, 11 is the air inlet pipe, 12 is the observation cylinder, 13 is the first baffle, 14 is the second baffle, 15 is the groove, 16 is the limiting rod, 17 is the limiting plate, and 18 is the stop rod. 100 is the crystallizer, and 200 is the injection tube. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments: like Figures 1-6As shown, this embodiment provides a protective gas hood for vertical ingot casting, which is installed at the upper inlet of the crystallizer 100. It includes a first cylindrical body 1 positioned above the crystallizer 100. Specifically, the first cylindrical body 1 is directly and coaxially placed above the crystallizer 100. A second cylindrical body 2 is disposed inside the first cylindrical body 1. A cover plate 3 is fixedly installed flush with the top of the first cylindrical body 1 and the second cylindrical body 2. A circular hole 4 is opened in the center of the cover plate 3. During molten metal transfer, the injection pipe 200 passes through the circular hole 4 and is inserted into the crystallizer 100 to inject liquid metal into the crystallizer 100 for cooling. Specifically, when the injection pipe 200 passes through the circular hole 4... Typically, the cylinder is tilted inwards and then adjusted to remain vertical. Therefore, the diameter of the circular hole 4 is larger than the outer diameter of the injection tube 4. An annular lower plate 5 is fixedly installed at the lower end of the second cylinder 2. The outer side of the lower plate 5 is fixedly connected to the inner wall of the first cylinder 1, and the inner side is fixedly connected to the lower end of the second cylinder 2. The lower sides of both the second cylinder 2 and the lower plate 5 are higher than the upper side of the crystallizer 100. Specifically, the axial length of the first cylinder 1 is greater than that of the second cylinder 2. By creating a gap between the lower plate 5 and the upper side of the crystallizer 100, the protective gas (such as nitrogen or coal gas) introduced is ensured to cover the upper opening of the crystallizer 100, effectively ensuring the effect of isolating air.

[0019] The first cylinder 1 has an air inlet 7 and an observation port 8 on its side, and the second cylinder 2 has an air outlet 9 on its side, which is radially corresponding to the observation port 8. Two sealing plates 10 are fixedly installed between the first cylinder 1 and the second cylinder 2. The sealing plates 10 are respectively fixedly installed on both sides of the air outlet 9 or the observation port 8. The first cylinder 1, the second cylinder 2, the cover plate 3, the lower plate 5, and the sealing plates 10 together form a protective gas diffusion channel. The second cylinder 2 has multiple air distribution holes 6. The air inlet 7 is connected to an air inlet pipe 11, which is used to introduce air during the ingot casting stage. After the protective gas is applied, the protective gas delivered by the inlet pipe 11 enters the diffusion channel through the inlet 7. After spreading in the diffusion channel, it is evenly distributed into the inner side of the second cylinder 2 and the area below the lower plate 5 through multiple gas distribution holes 6. The observation port 11 is fixedly equipped with an observation tube 12, which then leaks out from the observation tube 12 at the positions of the round hole 4 and the observation port 8. The observation tube 12 is trumpet-shaped, with the small opening of the trumpet-shaped observation tube 12 connected to the observation port 8 and the large opening tilted upward. The liquid metal level in the crystallizer 100 is observed and determined through the observation tube 12.

[0020] like Figure 4-5 As shown, a first baffle 13 and a second baffle 14 are slidably disposed on the upper side of the cover plate 3. Grooves 15 are formed on opposite sides of the first baffle 13 and the second baffle 14. When closed, the grooves 15 form a circular hole above the circular hole 4. The grooves 15 penetrate vertically through the corresponding first baffle 13 or second baffle 14. The grooves 15 are matched with the injection tube 200, as shown... Figure 4As shown, this represents the positions of the first baffle 13 and the second baffle 14 before the injection tube 200 is inserted. When the injection tube 200 is inserted and adjusted to a vertical position, the first baffle 13 and the second baffle 14 slide towards each other until... Figure 5 As shown (the injection tube 200 is omitted in the figure), the area between the outer side of the injection tube 200 and the inner wall of the circular hole 4 is sealed by the first baffle 13 and the second baffle 14 to reduce the leakage of protective gas in the inner area of ​​the first cylinder 1.

[0021] A first limiting member, a second limiting member, and two third limiting members are fixedly arranged above the cover plate 3. The first limiting member and the second limiting member are respectively located on the side of the first baffle 13 and the second baffle 14 that are far apart from each other. The third limiting members are respectively located on opposite sides of the groove 15 and on opposite sides of the first baffle 13. Both the first limiting member and the third limiting member include a limiting rod 16 and a limiting plate 17. The limiting rod 16 passes through the corresponding limiting plate 17 and one end of it is fixedly connected to the first baffle 13. The limiting rod 16 and the limiting plate 17 cooperate to limit the sliding direction of the first baffle 13 to prevent it from deviating at an angle. The limiting plates 17 located at both ends of the first baffle 13 limit the sliding stroke of the first baffle 13 to prevent the first baffle 13 from damaging the injection tube 200 when it slides.

[0022] The second limiting member includes a limiting rod 16 and at least two limiting plates 17. The limiting rod 16 passes through the two limiting plates 17 and one end of it is fixedly connected to the second baffle 14. By setting the two limiting plates 17, the limiting rod 16 is prevented from deviating at an angle, thereby limiting the sliding direction of the second baffle 14. The limiting plates 17 of the second limiting member limit the stroke of the second baffle 14 as it slides away from the circular hole 4.

[0023] A stop bar 18 is provided on one side of the second baffle 14. One end of the stop bar 18 is fixedly connected to the second baffle 14, and the other end corresponds to the limiting plate 17 of one of the third limiting members along the sliding direction of the second baffle 14. By cooperating with the limiting plate 17 of the corresponding third limiting member, the stroke of the second baffle 14 sliding close to the first baffle 13 is limited, so as to avoid damage to the injection tube 200 when the second baffle 14 slides.

[0024] During the ingot casting stage, protective gas is first supplied to the inside of the first cylinder 1 through the gas inlet pipe 11. The protective gas enters the diffusion channel, diffuses within the channel, and then evenly enters the inside of the second cylinder 2 and the area below the lower plate 5 through multiple gas distribution holes 6, ensuring that the protective gas covers the entire area above the crystallizer 100. Subsequently, the injection pipe 200 is inserted into the round hole 4 and extends deep into the crystallizer 100 (e.g., Figure 6 (As shown), then slide the first baffle 13 and the second baffle 14 close to the injection tube 200 (as before sliding). Figure 4 As shown, after sliding... Figure 5 As shown), the first baffle 13 and the second baffle 14 cover the area between the outer side of the injection tube 200 and the inner side of the circular hole 4, reducing the leakage of protective gas and reducing the loss of protective gas, and then the melt transfer operation is carried out.

[0025] The embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the patent claims of this utility model should be included within the scope of the patent application of this utility model.

Claims

1. A protective gas hood for vertical ingot casting, installed at the upper inlet of the crystallizer, characterized in that, The system includes a first cylinder (1) positioned above the crystallizer (100), a second cylinder (2) positioned inside the first cylinder (1), a cover plate (3) fixedly positioned on the top of the first cylinder (1) and the second cylinder (2), a round hole (4) in the middle of the cover plate (3), and an annular lower plate (5) fixedly positioned at the lower end of the second cylinder (2). The lower plate (5) is fixedly connected to the inner wall of the first cylinder (1) on the outer side and to the lower end of the second cylinder (2) on the inner side. The lower sides of the second cylinder (2) and the lower plate (5) are both higher than the upper side of the crystallizer (100). The second cylinder (2) is provided with multiple air holes (6). The first cylinder (1) has an air inlet (7) and an observation port (8) on opposite sides. The second cylinder (2) has an air outlet (9) on one side that is radially corresponding to the observation port (8). Two sealing plates (10) are fixedly installed between the first cylinder (1) and the second cylinder (2). The sealing plates (10) are fixedly installed on both sides of the air outlet (9) or the observation port (8). The air inlet (7) is connected to an air inlet pipe (11). The observation port (8) is fixedly provided with an observation cylinder (12).

2. A protective gas cover for vertical ingot casting according to claim 1, characterized in that, The observation tube (12) is trumpet-shaped, with the small opening of the trumpet-shaped observation tube (12) connected to the observation port (8) and the large opening tilted upward.

3. A protective gas cover for vertical ingot casting according to claim 1, characterized in that, A first baffle (13) and a second baffle (14) are slidably disposed on the upper side of the cover plate (3). The first baffle (13) and the second baffle (14) are provided with grooves (15) on opposite sides. The grooves (15) are located above the round hole (4).

4. A protective gas cover for vertical ingot casting according to claim 3, characterized in that, A first limiting member, a second limiting member, and two third limiting members are fixedly arranged above the cover plate (3). The first limiting member and the second limiting member are respectively located on the side away from the first baffle (13) and the second baffle (14). The third limiting members are respectively located on the opposite sides of the groove (15) and on the opposite sides of the first baffle (13) with the first limiting member. Both the first limiting member and the third limiting member include a limiting rod (16) and a limiting plate (17). The limiting rod (16) passes through the corresponding limiting plate (17) and one end of it is fixedly connected to the first baffle (13). The second limiting member includes a limiting rod (16) and at least two limiting plates (17), wherein the limiting rod (16) passes through the two limiting plates (17) and one end of the rod is fixedly connected to a second baffle (14).

5. A protective gas cover for vertical ingot casting according to claim 4, characterized in that, A stop bar (18) is provided on one side of the second baffle (14). One end of the stop bar (18) is fixedly connected to the second baffle (14), and the other end corresponds to the sliding direction of the limiting plate (17) of one of the third limiting members along the second baffle (14).

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