CN219443428U - High-purity magnesium and magnesium alloy net-density casting furnace - Google Patents

Abstract

A high purity magnesium and magnesium alloy net-density casting furnace, comprising: the device comprises an upper cover, a furnace body, a crucible, a valve body control mechanism, a mold box, a mold lifting mechanism, a vacuum system and an inert gas protection system, wherein an upper temperature zone and a lower temperature zone are arranged in the furnace body, the upper temperature zone is a smelting zone and is used for smelting raw magnesium or magnesium alloy raw materials, and the lower temperature zone is a net-closely cast ingot forming zone and is used for forming high-purity magnesium or magnesium alloy ingots. During processing, inert gas is injected in a vacuumizing mode firstly, under the protection of the inert gas, after the raw materials are melted in an upper temperature zone, the raw materials are injected into a die through a valve body, the raw materials are split-flow and filtered in two stages in a die forming zone, pure metal liquid enters a die cavity, the periphery of the die is heated under the action of a heater at the lower part of the die forming zone, the bottom of the die is cooled, so that the metal liquid in the die forming zone is cooled from bottom to top, the metal liquid is cooled from inside to outside in a gradient mode, shrinkage cavities are avoided, and pure and compact high-purity magnesium or magnesium alloy cast ingots are prepared.

Description

High-purity magnesium and magnesium alloy net-density casting furnace

[ field of technology ]

The utility model relates to a casting furnace, in particular to a net-density casting furnace for high-purity magnesium and magnesium alloy.

[ background Art ]

Magnesium is used as the lightest metal structural material, as the reducing agent of metals such as titanium, zirconium, hafnium and the like, and as a promising energy storage material and biomedical material. High purity magnesium and magnesium alloy ingots determine downstream high quality applications.

At present, magnesium and magnesium alloy ingots are generally prepared by refining metal raw materials by an open type smelting furnace to form a high-temperature molten casting liquid, and then adding the high-temperature molten casting liquid into a continuous casting machine for cooling under the protection of air or partial gas to form ingots. This needs two kinds of equipment, has increased manufacturing cost, simultaneously because the ingot cooling rate is generally faster, this can make the ingot surface appear shrinkage cavity phenomenon, and after the shrinkage cavity appears in the ingot, it often mixes with chlorine salt wherein, sometimes imbeds very deeply even, is difficult for brushing off, this can influence the ingot quality. And after the chlorine salt absorbs moisture, hydrochloric acid solution generated by hydrolysis permeates into the center of the ingot to cause corrosion, so that the ingot with large shrinkage cavity is difficult to store.

For solving shrinkage cavity scheduling problem that appears in the ingot casting cooling process, the patent application number 201721348808.4 discloses a constant temperature equipment for ingot casting machine, and it is used for installing and provides invariable temperature protection for a plurality of ingot casting grooves (corresponding to the mould) that set up in the ingot casting machine in ingot casting machine lower part, the ingot casting machine includes a action wheel and a follow driving wheel and cover simultaneously locates the action wheel and follows the track on the driving wheel, ingot casting groove evenly distributed rotates along with the track circulation on the track, constant temperature equipment is including locating cooling chamber and the heating chamber, control module and the temperature sensing device of installing at cooling chamber and heating chamber both ends that just set up below the ingot casting machine, be equipped with the cooling water pump in the cooling chamber, be equipped with gas switch solenoid valve in the heating chamber, temperature sensing device is connected with control module through the wire respectively, and control module passes through wire control cooling water pump and gas switch solenoid valve respectively.

Although the constant temperature device for the ingot casting machine can control the temperature of the ingot casting groove, the device still needs to inject the molten high-temperature molten liquid magnesium into the ingot casting machine after smelting and control the temperature through the device, so that the production and processing equipment is increased, the working time is prolonged, and the production cost is increased; meanwhile, due to the structural characteristics of the continuous casting machine, the continuous casting machine can only be used for preparing coarse magnesium.

In addition, the crawler belt in the constant temperature device for the ingot casting machine rotates clockwise, the ingot casting groove is upwards arranged to receive the injected liquid magnesium metal after passing over the driven wheel, and the opening is downwards arranged to conveniently unload the solidified ingot after passing over the driving wheel. And then, the ingot casting groove enters the constant temperature device for heat preservation. Therefore, the temperature of the cast ingots in the cast ingot grooves before entering the constant temperature device cannot be kept, and the cast ingots in the cast ingot grooves can be reduced, so that the cast ingots are subjected to shrinkage cavity and other phenomena.

[ utility model ]

In order to solve the problems, the utility model provides a high-purity magnesium and magnesium alloy net dense casting furnace, the device is provided with a vacuum system and an inert gas protection system, the vacuum system is started after raw materials are added into the device to pump out air in the system, inert gas is injected into the system, micro positive pressure of the system is ensured, the raw materials are simultaneously ensured to be isolated from air, combustion and oxidation are avoided, the generation of oxides is reduced, the raw materials are melted through a melting area to form high-temperature molten metal liquid, the high-purity molten metal liquid is injected into a mould after secondary filtration, continuous and constant temperature is provided for an ingot entering the mould through a constant temperature device of a mould forming area, and meanwhile, a cooling device is arranged below the mould by the net dense furnace to ensure that the ingot can be slowly cooled from inside to outside, so that shrinkage phenomenon is avoided, and the whole working process can be completed by only one set of equipment, thereby realizing the advantages of high purity, high quality stability, high compactness, high production efficiency, low cost, simplicity in operation and the like of the ingot.

In order to achieve the above object, the present utility model provides a high purity magnesium and magnesium alloy net dense casting furnace, comprising: the sealed furnace body is connected with an external vacuum system through a vacuumizing pipeline and is connected with an external inert gas protection system through an air inlet pipe and an air outlet pipe, and a pressure gauge is arranged on the sealed furnace body;

the smelting zone includes: the crucible is internally provided with a first-level filter plate and a baffle plate from top to bottom, the top of the sealed furnace body is provided with a valve control mechanism, one end of the pull rod is connected with a lifting pull rod in the valve control mechanism, the other end of the pull rod passes through the first-level filter plate and then is connected with the valve, and the baffle plate is provided with a valve hole which is matched with the valve;

the mold section includes: the ingot casting mold is coaxially arranged with the valve hole, the lower heater is sleeved on the outer side of the ingot casting mold, the top of the ingot casting mold is provided with a secondary filter plate, the outer side of the secondary filter plate extends upwards to form a containing wall, the bottom of the ingot casting mold is provided with a cooling disc, and the lower heater is connected with the bottom of the crucible through a connecting plate;

a lifting mechanism is arranged below the die box and comprises: the lifting device comprises a base, a lifting controller arranged above the base and a lifting rod connected with the lifting controller, wherein the end part of the lifting rod penetrates through a mould box and then is connected with the bottom of an ingot mould.

In particular, the baffle plate is provided with a concave conical surface on one side facing the primary filter plate.

In particular, the valve is conical, the small end of the valve faces to the side far away from the primary filter plate, and the valve hole is a conical hole which is matched with the valve.

In particular, the height below the upper heater is not lower than the height of the bottom of the crucible, and the height of the inner cavity of the ingot mould is lower than the height of the lower heater.

Particularly, a groove which is matched with the bottom of the ingot mould is formed in the top of the cooling disc, a cooling groove is formed in the cooling disc, a water inlet pipe is arranged at the bottom of the cooling groove, and a water outlet pipe is arranged at the top of the cooling groove.

The furnace body comprises a furnace body, a connecting plate, a sealing furnace body, a heat-insulating layer, a lower heater, a connecting plate, a sealing furnace body and a furnace cover.

In particular, a shunt block is arranged at the center of the secondary filter plate, and a shunt groove is formed in the shunt block.

In particular, an annular supporting plate extends inwards from the inner wall of the crucible, and the primary filter plate is arranged on the annular supporting plate.

Compared with the prior art, the utility model has the following beneficial effects:

1. the sealing furnace body is divided into an upper temperature zone and a lower temperature zone, wherein the upper temperature zone is a smelting zone, the lower temperature zone is a mold forming zone, and raw materials can be melted into liquid under the action of an upper heater, so that a smelting furnace is not required to be arranged independently, and the production equipment cost is saved;

2. after the smelted high-temperature metal liquid is filtered by the first-stage filter plate and the second-stage filter plate, impurities such as oxides and the like can be removed, a refining agent capable of introducing other impurities is not required to be added, so that the metal liquid entering a forming area of a die is purer, and preparation is carried out for preparing high-purity and high-density cast ingots;

3. the lower heater of the lower temperature zone can heat pure metal liquid entering the ingot mould, and the cooling disc below the mould can cool the bottom of the ingot mould, so that the metal liquid is firstly shrunk and is cooled from bottom to top from inside to outside, shrinkage holes of an ingot due to rapid cooling are avoided, and the quality of the ingot is improved;

4. after cooling is finished, the lifting mechanism starts to work, drives the ingot mould above the lifting mechanism to move downwards until the ingot mould moves into the mould box, and can take out an ingot by disassembling the ingot mould, so that the ingot can be cooled secondarily in the downward movement process, and the ingot with high purity and high density is prepared;

5. the sealed furnace body is connected with an external vacuumizing system and an inert gas protection system, so that the processing process can be performed under the protection of inert gas, oxygen is isolated, combustion is stopped, and a fire extinguishing solvent is not needed.

In conclusion, the high-purity ingot casting net-sealing melting furnace has the advantages of low equipment cost and high working efficiency, and the produced high-purity ingot casting has no shrinkage cavity and high net density.

[ description of the drawings ]

FIG. 1 is a diagram showing the construction of a high purity magnesium and magnesium alloy net-density casting furnace according to the present utility model;

FIG. 2 is a cross-sectional view of the net-density casting furnace of the high purity magnesium and magnesium alloy of FIG. 1 at A-A in accordance with the present utility model;

FIG. 3 is an enlarged view of the portion B of FIG. 2 of a net dense casting furnace for high purity magnesium and magnesium alloys in accordance with the present utility model.

In the figure: 1-sealed furnace, 2-smelting zone, 21-crucible, 22-pull rod, 23 upper heater, 24-primary filter plate, 25-baffle plate, 26-valve control mechanism, 27-valve, 28-valve hole, 29-annular support plate, 3-mold zone, 31-ingot mold, 32-lower heater, 33-secondary filter plate, 34-holding wall, 35-split block, 36-cooling plate, 37-cooling tank, 38-water inlet pipe, 39-water outlet pipe, 4-mold box, 5-connecting plate, 6-lifting mechanism, 61-base, 62-lifting controller, 63-lifting rod, 7-heat preservation layer, 8-groove, 9-vacuumizing pipe, 10-air inlet pipe, 11-air outlet pipe.

[ detailed description ] of the utility model

The present utility model will be described in further detail with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present utility model more apparent.

As shown in fig. 1 to 3, the present utility model provides a high purity magnesium and magnesium alloy net dense casting furnace, comprising: the sealed furnace comprises a sealed furnace body 1, a smelting area 2, a mould area 3 and a mould box 4, wherein the smelting area 2 and the mould area 3 are arranged in the sealed furnace body 1 from top to bottom, the mould box 4 is arranged below the sealed furnace body 1 and is used for containing cast ingots, the sealed furnace body 1 is arranged above the ground through a bracket, the sealed furnace body 1 is connected with an external vacuum system through a vacuumizing pipeline 9 and is connected with an external inert gas protection system through an air inlet pipe 10 and an air outlet pipe 11, and a pressure gauge used for monitoring the pressure in the sealed furnace body 1 is arranged on the sealed furnace body 1; the middle level of support is equipped with a flat panel that is used for supplying the staff to walk, and the flat panel below is located to mould case 4, for the maintenance of being convenient for, and support one side still is equipped with the cat ladder, in order to when maintenance, plays the guard rail to the maintainer, still is equipped with above the support.

The sealed furnace body 1 is divided into an upper temperature zone and a lower temperature zone, wherein the upper temperature zone is a smelting zone 2, the smelting zone 2 is used for smelting cast ingots and the like which are put into so as to become high-purity metal liquid, and the smelting zone comprises: a crucible 21, a pull rod 22, and an upper heater 23 which is sleeved outside the crucible 21. The crucible 21 is open, so that the casting ingot is convenient to put into, after the casting ingot is put into, the vacuum pump is used for vacuumizing the sealed furnace body 1, and then the protective gas, which can be argon, is introduced, so that the casting ingot is ensured to be smelted into molten metal in a safe environment. Since magnesium oxide exists on the outer surface of the ingot and some impurities may be contained in the ingot, a first-stage filter plate 24 for filtering the magnesium oxide is arranged in the crucible 21 in order to ensure the purity of the ingot; and a baffle plate 25 is arranged below the primary filter plate 24 in the crucible for facilitating the collection of the metal liquid. In order to ensure that the metal liquid can quantitatively flow into the mould area 3, the top of the sealed furnace body 1 is provided with a valve control mechanism 26, the end part of a lifting rod of the valve control mechanism 26 is connected with a pull rod 22, the other end of the pull rod 22 sequentially passes through the top of the sealed furnace body 1 and the first-stage filter plate 24 and then is connected with a valve 27, the center of the baffle plate 25 is provided with a valve hole 28 which is matched with the outer wall of the valve 27, in the utility model, the valve 27 can accurately control the flow rate of the metal liquid and the metal liquid flowing into the ingot mould 31, and after the valve 27 is opened, the metal liquid can enter the ingot mould 31 along the valve hole 28, and in order to further control the metal liquid amount, the pull rod 22 is provided with scales.

The mold zone 3 is a lower temperature zone for completing the formation of an ingot, and comprises: an ingot mould 31 coaxially arranged with the valve hole 28, and a lower heater 32 sleeved outside the ingot mould 31. The ingot mould 31 is a detachable mould, after cooling is completed, the ingot mould can be detached, so that the ingot is taken out to complete the forming of the ingot again, a secondary filter plate 33 is arranged at the top of the ingot mould 31, the outer side of the secondary filter plate 33 extends upwards to form a containing wall 34, the containing wall 34 and the secondary filter plate 33 form a containing groove for storing metal liquid, and after the metal liquid enters the containing groove, the metal liquid can be filtered again under the action of the secondary filter plate 33, so that the purity of the metal liquid entering the ingot mould is ensured to be higher. The lower heater 32 can heat the metal liquid entering the die, so that shrinkage holes of the metal liquid due to rapid cooling are avoided; in order to further avoid shrinkage cavity of the ingot, in the utility model, the bottom of the ingot mould 31 is provided with a cooling disc 36, the cooling disc 36 is communicated with an external cooling system, so that the lower heater 32 heats the periphery of the ingot mould 31, and cold water in the cooling disc 36 cools the bottom of the metal liquid, thereby ensuring that the ingot is cooled from bottom to top and from inside to outside, and further avoiding shrinkage cavity of the ingot due to rapid cooling; in order to fix the lower heater 32 and the crucible 21, the lower heater 32 is connected to the bottom of the crucible 21 through the connection plate 5.

The mold box 4 may be used for taking out or holding an ingot, a door is provided on one side of the mold box 4 for facilitating the taking out of the ingot, and a lifting mechanism 6 for lifting or lowering the ingot mold 31 is provided between the mold box 4 and the ground, which comprises: the base 61, the lifting controller 62, lifter 63, subaerial is located to the base 61, lifting controller 62 can be the cylinder, and it locates the base 61 top, lifter 63 one end is connected with lifting controller 62, and the other end passes behind the mould case 4 and locates the ingot mould 31 bottom, so after accomplishing preliminary cold zone, lifting controller 62 begins work, under lifter 63's effect, drives ingot mould 31 downwardly moving to mould case 4, opens mould case 4's door at this moment, unpacks ingot mould 31, can take out the ingot, and ingot mould 31 can realize the secondary cooling of ingot in the decline in-process simultaneously, ensures the compactness of ingot.

In particular, the side of the baffle plate 25 facing the primary filter plate 24 is a concave conical surface; so designed, the metal liquid can flow to the valve hole 28 side under the action of the concave conical surface after the primary filtration, so that the metal liquid can flow into the ingot mould 31 quickly.

In particular, the valve 27 is conical, the small end of the valve is towards the side far away from the primary filter plate 24, and the valve hole 28 is a conical hole corresponding to the valve 27; in the utility model, the conical valve is adopted to reduce the flow resistance coefficient of the valve, so that the metal liquid can flow out conveniently, and vortex can not be generated after the metal liquid passes through the conical valve.

In particular, the height below the upper heater 23 is not lower than the height of the bottom of the crucible 21, and the height of the cavity of the ingot mould 31 is lower than the height of the lower heater 32; by the design, the ingot in the crucible 21 can be ensured to be quickly smelted into metal liquid, and the metal liquid is in a liquid state before entering the ingot mould 31 through the primary filter plate 24, so that the metal liquid can better flow into the ingot mould 31, the periphery of the metal liquid entering the ingot mould 31 can be always in a heat preservation state under the action of the lower heater 32, and the purposes of external heat preservation and bottom cooling are realized by combining bottom cooling, so that the ingot is cooled from bottom to top and from inside to outside.

Specifically, a groove 9 corresponding to the bottom of the ingot mould 31 is formed in the top of the cooling disc 36, a cooling groove 37 is formed in the cooling disc, a water inlet pipe 38 communicated with a water outlet pipe of the cooling system is formed in the bottom of the cooling groove 37, and a water outlet pipe 39 communicated with the water inlet pipe of the cooling system is formed in the top of the cooling disc; so designed, be convenient for take out ingot mould 31 and unpack, and then make things convenient for taking out of ingot, simultaneously, inlet tube 38 is higher than outlet pipe 39 highly low, after cooling system's cold water flows to cooling tank 37 along inlet tube 38, can annotate cooling tank 37 fast to cool off ingot mould 31 bottom, the water after accomplishing the cooling can be along outlet pipe 39 discharge entering cooling system in, forms the cooling water again, so circulation.

The furnace body is characterized by further comprising a heat preservation layer 7, wherein a lower heater is arranged in the heat preservation layer 7 and sleeved outside the ingot mould, one end of the heat preservation layer is in contact with the connecting plate, the other end of the heat preservation layer is in contact with the end face of the bottom of the sealing furnace body, and the section of the lower heater is annular.

Particularly, in the present utility model, the aperture of the valve hole 28 is smaller, and when the metal liquid flows out along the valve hole 28, it may be accumulated on the secondary filter plate 33 below the valve hole, so a diverter block 35 is disposed at the center of the secondary filter plate 33, and the diverter block 35 is provided with a diverter groove, so when the metal liquid flows into the diverter block 35 along the valve hole 28, the metal liquid is uniformly distributed on the secondary filter plate 33 along the diverter groove on the diverter block 35, so that the metal liquid uniformly enters the ingot mold 31 and then is spread in the ingot mold 31, thereby ensuring that the prepared ingot has higher density.

In particular, in the present utility model, the ingot after smelting has magnesium oxide which is accumulated above the primary filter plate 24, so that the molten metal is inconvenient to flow downwards, and thus the inner wall of the crucible 21 extends inwards to form an annular support plate 29, and the primary filter plate 24 is arranged on the annular support plate 29; the annular support plate 29 can support the primary filter plate 24, and after the current ingot casting molding is completed, the primary filter plate 24 can be cleaned or replaced by taking the primary filter plate 24 off, and after the primary filter plate 24 is cleaned or replaced, the ingot casting can be processed again.

The working process comprises the following steps:

firstly, opening an upper cover of the sealed furnace body 1, then putting raw materials into a crucible 21, closing the cover, vacuumizing the sealed furnace body 1, and introducing protective gas-argon after vacuumizing is finished; then the upper heater 23 and the lower heater 32 are turned on, after the set temperature is reached, the cast ingot begins to melt to form metal liquid, magnesium oxide and the like remain on the first-stage filter plate 24 after the metal liquid is filtered by the first-stage filter plate 24, and pure metal liquid enters the lower part of the first-stage filter plate 24; at the same time, the valve 27 is opened, the filtered metal liquid enters into the accommodating groove formed by the secondary filter plate 33 and the accommodating wall 34, and after being filtered again by the secondary filter plate 33, the metal liquid with higher purity enters into the ingot mould 31; then the cooling system starts to work, enters the cooling disc 36 along the water inlet pipe 38 to cool the bottom of the ingot mould 31, and the periphery of the ingot mould 31 is in a heating state under the action of the lower heater 32, so that the metal liquid in the ingot mould 31 can be cooled from bottom to top and from inside to outside, and shrinkage cavity of an ingot due to rapid cooling is avoided; when the ingot mould 31 reaches the injection amount, the lifting mechanism 6 starts to work, drives the ingot mould 31 to move downwards, and can realize secondary cooling in the downwards moving process, when the ingot mould 31 enters the mould box 4, the mould box 4 door is opened, the ingot mould 31 is disassembled, and the ingot can be taken out, so that the processing of a pure and compact ingot can be completed; and then installing the ingot mould 31, lifting the ingot mould 31 to the original position under the action of the lifting mechanism 6, and recovering the original position, and repeating the above work until the ingot is machined.

In summary, when the clean and close smelting and casting furnace provided by the utility model is used for processing high-purity magnesium and magnesium alloy, the furnace body is vacuumized before smelting and casting raw materials, and inert protective gas-argon is injected, so that the whole smelting and casting process is performed under the inert protective gas, oxygen is isolated, and combustion can be stopped without adding a fire extinguishing solvent; secondly, when smelting raw materials, oxides and impurities in the metal liquid can be effectively filtered through secondary filtration, and a refining agent is not required to be added, so that the metal liquid entering an ingot mould is ensured to be purer; when the ingot mould is used for casting ingot, the lower heater is used for heating the periphery of the ingot mould, and the cooling disc is used for cooling the bottom of the ingot mould, so that the solution is solidified layer by layer through layer heat exchange of metal liquid in the ingot mould, and the processed ingot is more compact.

Claims (8)

1. The utility model provides a pure close smelting casting furnace of high-purity magnesium and magnesium alloy which characterized in that includes: the device comprises a sealed furnace body (1), a smelting area (2), a mould area (3) and a mould box (4) which are arranged in the sealed furnace body (1) from top to bottom, wherein the mould box is arranged below the sealed furnace body (1) and connected with an ingot casting through Yu Cheng, the sealed furnace body (1) is connected with an external vacuum system through a vacuumizing pipeline (9) and is connected with an external inert gas protection system through an air inlet pipe (10) and an air outlet pipe (11), and a pressure gauge is arranged on the sealed furnace body (1);

the smelting zone (2) comprises: the crucible is characterized in that the crucible is provided with a crucible (21), a pull rod (22), an upper heater (23) and a valve (27) which are sleeved outside the crucible (21), a first-stage filter plate (24) and a baffle plate (25) are arranged in the crucible (21) from top to bottom, a valve control mechanism (26) is arranged at the top of the sealed furnace body (1), one end of the pull rod (22) is connected with a lifting rod in the valve control mechanism (26), the other end of the pull rod passes through the first-stage filter plate (24) and then is connected with the valve (27), and a valve hole (28) matched with the valve (27) is formed in the baffle plate (25);

the mould zone (3) comprises: the ingot casting mold comprises an ingot casting mold (31) coaxially arranged with a valve hole (28) and a lower heater (32) sleeved outside the ingot casting mold (31), wherein a secondary filter plate (33) is arranged at the top of the ingot casting mold (31), the outer side of the secondary filter plate (33) extends upwards to form a containing wall (34), a cooling disc (36) communicated with an external cooling system is arranged at the bottom of the ingot casting mold (31), and the lower heater (32) is connected with the bottom of a crucible (21) through a connecting plate (5);

a lifting mechanism (6) is arranged below the die box (4), and comprises: the ingot casting device comprises a base (61), a lifting controller (62) arranged above the base (61) and a lifting rod (63) connected with the lifting controller (62), wherein the end part of the lifting rod (63) penetrates through a mould box (4) and then is connected with the bottom of an ingot casting mould (31).

2. The high-purity magnesium and magnesium alloy net-sealing casting furnace according to claim 1, wherein the side of the baffle plate (25) facing the primary filter plate (24) is a concave conical surface.

3. The high-purity magnesium and magnesium alloy net-sealing casting furnace according to claim 2, wherein the valve (27) is conical, the small end of the valve faces to the side far away from the primary filter plate (24), and the valve hole (28) is a conical hole corresponding to the valve (27).

4. The net dense casting furnace for high purity magnesium and magnesium alloy according to claim 1, wherein the height below the upper heater (23) is not lower than the height of the bottom of the crucible (21), and the height of the cavity of the ingot mold (31) is lower than the height of the lower heater (32).

5. The pure-dense casting furnace for high-purity magnesium and magnesium alloy according to claim 1, wherein a groove (8) which is matched with the bottom of the ingot mould (31) is formed at the top of the cooling disc (36), a cooling groove (37) is formed in the cooling disc, a water inlet pipe (38) is arranged at the bottom of the cooling groove (37), and a water outlet pipe (39) is arranged at the top of the cooling groove.

6. The pure-dense casting furnace for high-purity magnesium and magnesium alloy according to claim 1, further comprising a heat-insulating layer (7), wherein a lower heater (32) is arranged in the heat-insulating layer and sleeved outside the ingot mould (31), one end of the heat-insulating layer (7) is contacted with the connecting plate (5), the other end is contacted with the bottom end face of the sealing furnace body (1), and the cross section of the lower heater (32) is annular.

7. The furnace for net-sealing casting of high purity magnesium and magnesium alloy according to claim 1, wherein a diverter block (35) is arranged at the center of the secondary filter plate (33), and diverter grooves are formed in the diverter block (35).

8. The pure-dense casting furnace for high-purity magnesium and magnesium alloy according to claim 1, wherein an annular supporting plate (29) extends inwards from the inner wall of the crucible (21), and the primary filter plate (24) is arranged on the annular supporting plate (29).