CN110935869A

CN110935869A - Molten metal transfer device

Info

Publication number: CN110935869A
Application number: CN201911373234.XA
Authority: CN
Inventors: 邢维旦; 俞立锋; 陈刚; 潘书文; 李洪波
Original assignee: NINGXIA SUN MAGNESIUM INDUSTRY Co Ltd
Current assignee: NINGXIA SUN MAGNESIUM INDUSTRY Co Ltd
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2020-03-31

Abstract

The invention discloses a metal melt transfer device which comprises a liquid transfer bag with a closed inner cavity, a lifting mechanism and a liquid loading and discharging mechanism, wherein the lifting mechanism and the liquid loading and discharging mechanism are arranged on the liquid transfer bag, the liquid loading and discharging mechanism comprises an inverted U-shaped liquid guide pipe, a connecting pipe and a gas circulation loop system, the connecting pipe is arranged at the top of the liquid transfer bag and is communicated with the inner cavity of the liquid transfer bag, the gas circulation loop system is connected with the connecting pipe, one end of the liquid guide pipe extends into the bottom of the inner cavity of the liquid transfer bag, and the other end of the liquid guide pipe penetrates through the. The metal melt transfer device has good sealing performance, avoids oxidation and combustion loss of the metal melt, reduces potential safety hazards such as leakage of high-temperature melt, can reduce disturbance to the liquid level as much as possible during liquid taking, avoids oxidation or combustion of the melt, and improves the product quality.

Description

Molten metal transfer device

Technical Field

The invention relates to a smelting tool, in particular to a metal melt transfer tool.

Background

In the industrial production process of metals with high activity, such as magnesium, molten magnesium liquid needs to be transferred from a smelting furnace to a holding furnace or a casting furnace. Highly active metals, such as magnesium, are highly susceptible to oxidation, combustion and even explosion due to their strong chemical affinity for oxygen, water, organics, and the like. Therefore, the magnesium liquid is conveyed from the smelting furnace to the holding furnace or the casting furnace, which is a key technology for improving the production safety and quality when casting magnesium and magnesium alloy.

The traditional technology is that the refined magnesium liquid is transferred by using a liquid transfer bag, the leakage of the magnesium liquid is easy to occur in the traditional liquid transfer mode, and meanwhile, the magnesium liquid is easy to oxidize and slag, so that the magnesium liquid is not beneficial to conveying. The specification of the Chinese patent with the publication number of CN204818029U discloses a liquid transfer ladle for smelting magnesium alloy. This change liquid package is equipped with the drain hole including the bottom of inclusion, and the drain downthehole stopper that is equipped with realizes dress liquid and tapping through the switching of drain hole and stopper. However, the liquid transfer bag has a plurality of problems, such as: the liquid transfer bag prevents magnesium liquid from falling down by virtue of the contact sealing between the liquid discharge hole and the plug surface, but because the contact surface is unreliable in sealing and the magnesium liquid is high in temperature, the sealing effect is poor, the phenomena of oxidation and combustion of the magnesium liquid in different degrees exist, and the risk of accidents caused by leakage and even leakage of the magnesium liquid also exists; when the magnesium liquid is packaged by the liquid transfer package, the liquid transfer package is required to be immersed into the magnesium liquid in a crucible of a smelting furnace to take the liquid, so that the liquid level of the magnesium liquid is disturbed, an oxygen-isolating protective layer formed on the liquid level after the magnesium liquid is refined by a flux is damaged, the magnesium liquid in the crucible of the smelting furnace is oxidized or combusted, the magnesium liquid cannot be completely transferred, a large amount of magnesium liquid is always in the crucible of the smelting furnace, and the like.

Disclosure of Invention

In view of the above problems, an object of the present invention is to provide a molten metal transferring apparatus which has a good oxygen barrier effect, is safe and reliable, and can transfer all of the molten metal.

In order to achieve the technical effects, the technical scheme adopted by the invention is as follows: a molten metal transfer device comprises a liquid transfer bag with a closed inner cavity, a lifting mechanism arranged on the liquid transfer bag and a liquid loading and discharging mechanism, wherein the liquid loading and discharging mechanism comprises an inverted U-shaped liquid guide pipe which is arranged in the inner cavity of the liquid transfer bag and is provided with two straight pipes and a bent pipe connected between the two straight pipes, a connecting pipe arranged at the top of the liquid transfer bag and communicated with the inner cavity of the liquid transfer bag, and a gas circulation loop system connected with the connecting pipe, one end of the liquid guide pipe extends into the bottom of the inner cavity of the liquid transfer bag, and the other end of the liquid guide pipe penetrates through the bottom of the liquid transfer bag and extends out of the liquid transfer bag; the gas circulation loop system comprises a pipeline, a gas storage bag with a gas inlet and a gas outlet, and a power pump, a first stop valve and a second stop valve which are sequentially connected from the gas storage bag gas inlet through the pipeline, wherein the second stop valve is connected with the gas storage bag gas outlet, the connecting pipe is connected between the first stop valve and the second stop valve, and inert gas is stored in the gas storage bag.

Further, the melt transfer apparatus further includes a first level sensor and a second level sensor extending into the transfer ladle for indicating a maximum level and a minimum level, respectively.

Further, the measuring liquid level position of the first liquid level sensor is lower than that of the bent pipe, and the measuring liquid level position of the second liquid level sensor is higher than that of the port of the catheter.

Furthermore, a branch pipe communicated with the inside of the bent pipe is arranged on the bent pipe of the liquid guide pipe, the branch pipe extends upwards to penetrate through the liquid transfer bag and is connected to a pipeline between the second stop valve and the air outlet of the air storage bag, and a third stop valve is arranged between the branch pipe and the second stop valve.

Further, the first stop valve, the second stop valve and the third stop valve are electromagnetic valves or electric valves, and the power pump is an electric vacuum pump.

Further, the molten metal transferring device further comprises a controller, and the first stop valve, the second stop valve, the third stop valve, the first liquid level sensor, the second liquid level sensor and the power pump are electrically connected with the controller.

Further, the gas storage bag is a variable volume container and comprises a cover body with an annular side wall and an annular top wall and an opening at the bottom and a liquid seal part matched with the cover body to seal the bottom of the cover body.

Furthermore, the liquid seal part comprises a plug part which has a shape similar to that of the cover body and can be contained in the cover body and an annular groove which is arranged along the periphery of the plug part, and sealing liquid is placed in the annular groove.

Furthermore, the cover body is provided with an air supply pipe for supplying air to the air storage bag.

Further, the liquid transfer bag is a cylindrical pressure container.

The invention has the beneficial effects that: the inner cavity of the liquid transfer ladle of the metal melt transfer device is closed, the pressure in the closed inner cavity of the liquid transfer ladle is changed through the gas circulation loop system, liquid charging and discharging are realized by utilizing the pressure difference between the inner cavity of the liquid transfer ladle and the outside, the sealing performance is good, the oxidation and the combustion loss of metal melt are avoided, and the potential safety hazards such as leakage of high-temperature melt are reduced. In addition, only the liquid guide pipe is required to be immersed into the molten liquid to be transferred during liquid filling, disturbance to the liquid level can be reduced as much as possible during liquid taking, damage to an oxygen-isolating protective layer of the molten liquid to be transferred during molten liquid transferring is greatly reduced, oxidation or combustion of the molten liquid is avoided, and product quality is improved. In addition, this structure enables the entire metal melt to be transferred.

Drawings

FIG. 1 is a schematic view showing the structure of a molten metal transfer apparatus according to the present invention when it is charged.

FIG. 2 is a schematic view showing the structure of the molten metal transferring apparatus of the present invention at the time of tapping.

Detailed Description

The invention will be further explained with reference to the drawings.

A molten metal transfer apparatus 100 includes a transfer ladle 1 having a closed inner cavity 101, a lifting mechanism 2 provided on the transfer ladle 1, and a liquid charging mechanism 3. The liquid transfer bag 1 is a cylindrical pressure container and is used for containing the molten liquid 200; the liquid loading and discharging mechanism 3 is used for loading the molten liquid 200 into the liquid transfer ladle 1 and discharging the molten liquid 200 from the liquid transfer ladle 1, the lifting mechanism 2 is used for carrying and operating the liquid transfer ladle 1, and the lifting mechanism 2 is preferably a lifting lug and can also be a lifting hook arranged at the top of the liquid transfer ladle 1.

The liquid loading and discharging mechanism 3 comprises a liquid guide pipe 4 arranged in the inner cavity 101 of the liquid transfer bag 1, a connecting pipe 5 arranged at the top of the liquid transfer bag 1 and communicated with the inner cavity 101 of the liquid transfer bag, and a gas circulation loop system 6 connected with the connecting pipe 5. The connecting pipe 5 is detachably connected with the gas circulation loop system 6, the liquid guide pipe 4 is an inverted U-shaped structure pipe provided with two straight pipes 401 and a bent pipe 402 connected between the straight pipes 401, one end of the liquid guide pipe 4 extends into the bottom of the inner cavity 101 of the liquid transfer bag 1, the other end of the liquid guide pipe 4 penetrates through the bottom of the liquid transfer bag 1 and extends out of the liquid transfer bag 1, and the bent pipe 402 is positioned near the top of the inner cavity 101 of the liquid transfer bag 1. The gas circulation loop system 6 is used for sucking or supplementing gas in the inner cavity 101 of the liquid transfer bag 1, changing the pressure in the inner cavity 101, generating pressure difference between the inner cavity 101 of the liquid transfer bag 1 and the outside of the liquid transfer bag 1, and filling or discharging the molten liquid 200 through the liquid guide pipe 4. In order to better grasp the liquid charging completion time node and the liquid discharging completion time node, the melt transfer device 100 further comprises a first liquid level sensor 31 and a second liquid level sensor 32 which are installed in the transfer ladle 1 and respectively indicate the highest liquid level and the lowest liquid level, the measuring liquid level position of the first liquid level sensor 31 is lower than that of the bent pipe 402, and the measuring liquid level position of the second liquid level sensor 32 is higher than that of the port of the straight pipe 401.

The gas circulation loop system 6 comprises a pipeline 61, a gas storage bag 62, a first stop valve 63 and a second stop valve 64 power pump 65. The gas storage bag 62 is a variable volume container, the gas storage bag 62 stores inert gas (not shown) such as argon gas and the like which does not react with the molten liquid, the gas storage bag 62 comprises a cover body 621 which is provided with an annular side wall 6214 and a top wall 6215 and has an open bottom, and a liquid sealing part 622 which is matched with the cover body 621 and seals the bottom of the cover body 621, the liquid sealing part 622 comprises a plug part 6221 which is similar to the cover body 621 in shape and can be contained in the cover body 621, and an annular groove 6222 which is arranged along the periphery of the plug part 6221, and sealing liquid 623 is placed in the annular groove. The cover 621 has an air inlet 6211, an air outlet 6212, and an air supply tube 6213 for supplying an inert gas to the air storage bag. The power pump 65, the first stop valve 63 and the second stop valve 64 are connected in sequence from the gas storage bag inlet 6211 through the pipeline 61, the second stop valve 64 is connected with the gas storage bag outlet 6212, and the connecting pipe 5 is connected to the pipeline between the first stop valve 63 and the second stop valve 64.

The molten metal transfer device 100 of the present invention comprises: the liquid transfer bag 1 is conveyed by a hoisting mechanism 2 by using tools such as a crown block and the like, one end of a liquid guide pipe 4 penetrating through the liquid transfer bag 1 is inserted into refined molten liquid, a first stop valve 63 is opened, a power pump 65 is started to vacuumize the inner cavity 101 of the liquid transfer bag 1, inert gas in the bag is pumped into the gas storage bag 62 along with the vacuumizing, the molten liquid is sucked into the inner cavity 101 of the liquid transfer bag 1 through the liquid guide pipe 4, when the molten liquid 200 reaches the highest liquid level, the first stop valve 63 is closed, and the liquid filling is finished. The tapping process of the molten metal transferring device 100 of the present invention is: and (3) opening the second stop valve 64, enabling the inert gas with pressure to enter the liquid transfer bag 1 from the gas storage bag 62, enabling the molten liquid to climb over the highest point of the liquid guide pipe 4 under the action of pressure and then be discharged from the liquid guide pipe 4, and closing the second stop valve 64 when the molten liquid in the liquid transfer bag 1 is reduced to the lowest liquid level, thus finishing the liquid discharge.

After the completion of the charging and discharging of the molten metal transferring apparatus 100 of the present invention, a liquid column tends to remain in the straight tube 401 of the liquid guiding tube 4, and there is a potential safety hazard that the liquid column falls from the straight tube 401 when the transfer ladle 1 is transported. Preferably, a branch pipe 403 communicated with the inside of the bent pipe 402 is arranged on the bent pipe 402 of the liquid guide pipe 4, the branch pipe 403 extends upwards to penetrate through the liquid transfer bag 1 and is connected to the pipeline 61 between the second stop valve 64 and the air outlet 6212 of the air storage bag 62, a third stop valve 66 is arranged between the branch pipe 403 and the second stop valve 64, and after liquid charging and discharging are finished, the third stop valve 66 is opened to allow inert gas in the air storage bag 62 to be filled into the liquid guide pipe 4, so that a liquid column in the liquid guide pipe 4 is blown down, and then the liquid transfer bag 1 is transported, so that potential safety hazards are eliminated. After the tapping of the molten metal transferring apparatus 100 is completed, a small amount of molten metal remaining in the transfer ladle 1 and not discharged from the liquid guiding tube 4 can be discharged from the adapter tube 5 by turning the transfer ladle 1.

Preferably, the first, second and

third stop valves

63, 64 and 66 are solenoid valves or electric valves, the power pump 65 is an electric vacuum pump, the molten metal transfer apparatus 100 further comprises a controller (not shown), the first, second and

third stop valves

63, 64 and 66, the first and

second level sensors

31 and 32, and the power pump 65 are electrically connected to the controller (not shown), and the controller (not shown) can issue operation commands to the above elements to automatically control the liquid charging and discharging processes.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A metal melt transfer device comprises a liquid transfer bag with a closed inner cavity, a lifting mechanism arranged on the liquid transfer bag and a liquid loading and discharging mechanism, and is characterized in that the liquid loading and discharging mechanism comprises an inverted U-shaped liquid guide pipe which is arranged in the inner cavity of the liquid transfer bag and is provided with two straight pipes and a bent pipe connected between the two straight pipes, a connecting pipe arranged at the top of the liquid transfer bag and communicated with the inner cavity of the liquid transfer bag, and a gas circulation loop system connected with the connecting pipe, wherein one end of the liquid guide pipe extends into the bottom of the inner cavity of the liquid transfer bag, and the other end of the liquid guide pipe penetrates through the bottom of the liquid transfer bag and extends out of the liquid transfer bag; the gas circulation loop system comprises a pipeline, a gas storage bag with a gas inlet and a gas outlet, and a power pump, a first stop valve and a second stop valve which are sequentially connected from the gas storage bag gas inlet through the pipeline, wherein the second stop valve is connected with the gas storage bag gas outlet, the connecting pipe is connected between the first stop valve and the second stop valve, and inert gas is stored in the gas storage bag.

2. The molten metal transfer apparatus of claim 1, further comprising first and second level sensors extending into the ladle for indicating a maximum level and a minimum level, respectively.

3. The molten metal transferring apparatus according to claim 2, wherein the first level sensor has a measurement level lower than the bending pipe, and the second level sensor has a measurement level higher than a port of the liquid guiding pipe.

4. The molten metal transferring apparatus according to claim 3, wherein the bending pipe of the liquid guiding pipe is provided with a branch pipe communicating with the inside of the bending pipe, the branch pipe extends upward through the liquid transferring bag and is connected to a pipe between the second shut-off valve and the gas outlet of the gas storage bag, and a third shut-off valve is provided between the branch pipe and the second shut-off valve.

5. The molten metal transferring apparatus according to claim 4, wherein the first stop valve, the second stop valve and the third stop valve are solenoid valves or electric valves, and the power pump is an electric vacuum pump.

6. The molten metal transferring apparatus according to claim 5, further comprising a controller, wherein the first stop valve, the second stop valve, the third stop valve, the first level sensor, the second level sensor, and the power pump are electrically connected to the controller.

7. The molten metal transferring apparatus according to claim 1, wherein the gas receiver is a variable volume container including a cover having an annular side wall and a top wall and an open bottom, and a liquid seal cooperating with the cover to close the bottom of the cover.

8. The molten metal transferring apparatus according to claim 7, wherein the liquid seal portion includes a plug portion having a shape similar to the housing and being received in the housing, and an annular groove provided along a periphery of the plug portion, and a sealing liquid is placed in the annular groove.

9. The molten metal transferring apparatus according to claim 7, wherein the cover body is provided with a gas supply pipe for supplying a gas to the gas receiver.

10. The molten metal transferring apparatus according to any one of claims 1 to 9, wherein said transfer ladle is a cylindrical pressure vessel.